INSTRUCTIONS TIME OVERCURRENT RELAYS TYPES IFC57AD AND IFCS7BD GENERAL ELECTRIC GEK-49948A des GEK-49948 Superse www . ElectricalPartManuals . com
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• INSTRUCTIONS
TIME OVERCURRENT RELAYS
TYPES
IFC57 AD AND IFCS7BD
GENERAL ELECTRIC
GEK-49948A des GEK-49948 Superse
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GEK-49948
TABLE OF CONTENTS
PAGE
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 CONSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
TIME-OVERCURRENT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 HIGH-SEISMIC INSTANTANEOUS UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 HIGH-SEISMIC TARGET AND SEAL IN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CONTACTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
BURDENS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
TIME-OVERCURRENT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Pickup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Operating Time Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
HIGH-SEISMIC INSTANTANEOUS UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 HIGH-SEISMIC TARGET AND SEAL-IN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
RECEIVING, HANDLING AND STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 ACCEPTANCE TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
VISUAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 MECHANICAL INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DRAWOUT RELAY TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 POWER REQUIREMENTS, GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 TIME-OVERCURRENT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Time Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Pickup Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Time Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
HIGH-SEISMIC INSTANTANEOUS UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Setting the High-Seismic Instantaneous Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
HIGH-SEISMIC TARGET AND SEAL-IN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Pickup and Dropout Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 INSTALLATION TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Time-Overcurrent Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 High-Seismic Target and Seal-In Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 High-Seismic Instantaneous Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PERIODIC CHECKS AND ROUTINE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 TIME-OVERCURRENT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 HIGH-SEISMIC INSTANTANEOUS UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 HIGH-SEISMIC TARGET AND SEAL-IN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 CONTACT CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 COVER CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 SYSTEM TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 TIME-OVERCURRENT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Pickup Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Time Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
MECHANICAL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 HIGH-SEISMIC INSTANTANEOUS UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 HIGH-SEISMIC AND SEAL-IN UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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GEK-49948
TIME OVERCURRENT RELAYS
TYPES IFC57D AND IFC57BD
DESCRIPTION
The type- I FC57AD re l ays covered by these i nstruct i ons are extended-range, s i ngl ephase t ime-overcurrent rel ays hav i ng a medi um-ti me i nverse character i st i c . The type- I FC57BD re l ays are simi l ar except that they i nc l ude, i n addi t i on, a h i ngedarmature i nstantaneous overcurrent uni t that prov i des i nstantaneous t r i ppi ng at h i gh current l eve l s when that feature i s desi red. Both the t i me-overcurrent u n i t and the i nstantaneous-overcurrent un i t are described i n deta i 1 i n the secti on on CONSTRUCTION. Both re l ays are equ i pped w ith a dual -rated target and seal - i n u n i t .
I n addi t i on to the contacts that are normal ly prov i ded for tri ppi ng, each of the re l ays is prov i ded w i th contacts that may be used for al arm, remote i ndi cat i on, or other purposes deemed su i tabl e by the user. Note that the contacts assoc i ated w i t h the target and seal - i n un i t wi l l operate only after the t i me-overcurrent u n i t contacts c l ose to draw tri p current, hence they are not rel i abl e for use as tr i pp i ng contacts. See the i nternal and external connect i ons for the exact contact arrangement used i n each of the re l ays, F i gures 3, 4, and 7 .
When sem i f l ush mounted on a su i tabl e pane l , these re l ays have a h i gh sei smi c capabi l i ty, i nc l udi ng both the target/seal - i n u n i t and t h e i nstantaneous overcurrent un i t when i t is suppl i ed. Al so, these rel ays are recogn i zed under the Components Program of Underwri ters Laboratori es, Inc .
The re l ays are mounted i n a si ze-C1 drawout case of mol ded construct i on . The out l i ne and panel dr i l l i ng are shown i n F i gures 16 and 1 7 . The re l ay i nternal connect i ons are shown i n F i gure 3 for the I FC57AD and i n F i gure 4 for the I F C57BD .
APPLICATION
Time overcurrent re lays f i nd extensi ve general use i n the protect i on of u t i l i ty and i ndustri a l power-di str i buti on systems and frequentl y as overl oad back-up protect i on at other l ocat i ons. The medi um-ti me i nverse characteri st i c of the IAC57 re l ays i s part i cu l arly usefu l as back-up ground-fau l t protecti on i n l ow- and medi um-vol tage i ndustr i a l systems when the rel ay i s connected to a current transformer i n the neutral of a power transformer or a generator . Typi cal external connecti ons for such an app l i cat i on are shown i n F igure 7 .
These instructions do not purport to cover all details or variations in equipment nor provide for every possible contingency to be met in connection with installation, operation or maintenance. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser's purposes, the matter should be referred to the General Electric Company.
To the extent required the products described herein meet applicable ANSI, IEEE and NEMA standards; but no such assurance is given with respect to local codes and ordinances because they vary greatly.
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When sett i ng these rel ays to coordi nate wi th downstream re l ays, a coord i nat i on t i me of from 0 . 25 to 0 . 40 second i s general ly a l l owed, dependi ng on the c l eari ng t i me of the breaker i nvol ved. These coord i nat i on t i mes i nc l ude, i n addi t i on to breaker c l ear i ng t i me, 0 . 10 second for re l ay overtravel and 0 . 1 7 second for safety facto r . For exampl e, i f t h e breaker c l eari ng t i me i s 0 . 13 second ( e i ght cyc l es ) , the coordi nat i on t i me wou l d be 0 . 40 second ( 0 . 13 + 0 . 10 + 0 . 1 7 ) .
I f the re l ay t i me i s set by test at factor may be reduced to 0 . 07 second . ( 5 ) cyc l es ( 0 . 08 second) a m i n i mum of a l l owed for coordi nat i on .
the current l evel i n quest i on, t h e safety Then i f the downstream breaker t i me i s f i ve 0 . 25 second ( 0 . 08 + 0 . 10 + 0 . 07 ) cou l d be
I f re l ay coordi nat i on t i mes are margi nal or i mpossi b l e to obtai n, use the re l ay overtrave l curves of F i gure 8 to ref i ne the re l ay sett i ngs. F i rst determi ne the re l ay-operat i ng t i me necessary to just match the operat i ng t i me of the downstream re l ay w i t h wh i ch coordi nat i on i s desi red . Determi ne the mu l t i pl e of pi ckup and the necessary t i me-di a l sett i ng to prov i de th i s re l ay-operat i ng t i me . Use the approxi mate curve of F i gure 8 to determ i ne the overtravel t i me i n percent of operat i ng t i me and convert th i s i nto real t i me . Add th i s t i me to the breaker t i me, the safety factor t i me, and the ori gi nal re l ay-operat i ng t i me to determ i ne t he f i na l re l ay-operat i ng t i me requ i red . Set the re l ay to t h i s val ue .
I n the grou nd-fau l t back-up appl i cat i on i t i s not customary to use t h e i nstantaneous un i t . On other appl i cat i ons where a n i nstantaneous u n i t i s needed, i t must be real i zed that th i s u n i t has a transi ent overreach characteri st i c, as i l l ustrated i n F i gure 9. Th i s i s the resu l t of the DC offset that i s usua l l y present i n. the current at the i ncept i on of a fau l t . When determi n i ng the p i ckup sett i ng for t h i s u n i t, the transi ent overreach must be taken i nto consi derat i on . The percent transi ent overreach shou l d be appl i ed to proport i onate ly reduce the cal cu l ated pi ckup sett i ng so that the i nstantaneous u n i t w i l l not overreach a downstream dev i ce and thereby cause a l oss of coordi nat i on i n the system protect i on scheme . The operat i ng-t i me character ist i cs of th i s u n i t are shown i n F i gure 10 .
CONSTRUCTION
The IFC induction disk relays consist of a molded case, cover support structure assembl y, and a connect i on pl ug to make up the e l ectri cal connect i on . See cover f i gure and F i gures 1, 2, and 1 5 . F i gure 2 shows the i nduct i on u n i t mounted to the mol ded support structure . Th i s di sk is act i vated by a current-operat i ng co i l mounted on a l ami nated U-magnet . The d isk and shaft assembl y carr i es a mov i ng contact that compl etes the a l arm or tr ip c i rcu i t when i t touches a stat i onary contact . The di sk assembly i s restrai ned by a spi ral spri ng to g i ve the proper contact-c l osi ng current . The d isk rotat i on i s retarded by a permanent magnet mounted i n a mo l ded housi ng on the support structure .
The drawout connect i on/test system for the C 1 case, shown i n F i gure 1 5, has prov i si ons for 14 connect i on po i nts, and a v is ib l e CT short i ng bar l ocated up front . As the connect i on plug is wi thdrawn, it c l ears the shorter contact f i ngers i n the output-contact c i rcu i ts f i rst . Thus, the tr ip c i rcu i t i s opened before any other c i rcu i ts are di sconnected . Next, current-c i rcu i t f i ngers on the case connect i on b 1 ock engage the shorti ng bar ( 1 ocated at the l ower front of the case ) to short-c i rcu i t external current-transformer secondary connect i ons. The w i ndow prov i des v i sual confi rmat i on of CT short i ng. The connect i on pl ug then c l ears the current-c i rcu i t contact f i ngers on the case, and f i nal l y those on the re l ay support structure, to compl ete l y de-energ ize the drawout e l ement .
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There i s a H i gh-Se i sm i c target and seal - i n un i t on the front to the l eft of the shaft of the t ime-overcurrent un i t, see F i gure 1 . The seal- i n u n i t has two e l ectri cal l y separate contacts, one of wh i ch i s i n seri es wi th i ts coi l and i n para l l e l w i th the contacts of the t i me-overcurrent u n i t such that when the i nducti on un i t contacts c l ose, the seal - i n un i t p i cks up and seals i n . When the seal - i n un i t p i cks up, i t rai ses a target i nto v i ew that l atches up and rema i ns exposed unt i l rel eased by press i ng a reset button l ocated on the upper l eft s i de of the cover .
The I FC 11B11 model re l ays contai n, i n add i t i on to the above, a H i gh-Se i sm i c i nstantaneou s un i t, see F i gure 1 . The i nstantaneous un i t i s a smal l h i nged-type u n i t w i t h e l ectr i cal ly separate contacts, and i s mounted on the front, to the r i ght of the shaft of the t i me-overcurrent un i t . One of i ts contacts i s normal ly connected i n paral l e l wi th the contacts of the t i me-overcurrent un it and i ts coi l i s connected i n ser i es wi th the t i me-overcurrent uni t . When the i nstantaneous u n i t p i cks up i t ra i ses a target that l atches u p and remai ns exposed unt i l i t i s re l eased . The same rest button that rel eases the target seal - i n u n i t a l so re l eases the target of the i nstantaneous un i t .
A magneti c s h i e l d, depi cted i n F i gure 1, i s mounted to the support structure to e l i m i nate the proximi ty effect of external magnet i c mater i al s .
Both the H i gh-Se i smi c target and seal - i n un i t and the H i gh-Se i sm i c i nstantaneou s u n i t have the l etters 11 Hi -G11 mo l ded i nto the i r target bl ocks to dist i ngu i sh them as H i gh-Se i sm i c u n i ts . The Sei smi c Frag i l i ty Leve l exceeds peak axi a l acce l erat i on of 10g•s ( 4g ZPA) when tested u s i ng a bi axi al mu l t i -frequency i nput mot i on to produce a Requ i red Response Spectrum ( RRS ) i n accordance w i th the I E E E Gu i de for Se i sm i c Test i ng o f Re l ays, STD501 - 1978.
RATINGS
The rel ays are des i gned for operat i on i n an ambi ent a i r temperature from -20° to +55° C .
T IME-OVERCURRENT UNIT
Ranges for the t i me-overcurrent un i t are shown i n Tabl e I .
RELAY
I FC57AD and BD
TABLE I
FREQUENCY (HERTZ)
50 and 60
CURRENT RANGE (AMPERES)
0 . 5 - 4 . 0 1 . 0 - 12 . 0
Avai l abl e taps for the t i me-overcurrent uni t are shown i n Tabl e I I .
TABLE I I
RANGE TAPS AVAILABLE (AMPERES) (AMPERES)
0 . 5 - 4 . 0 0 . 5, 0 . 6, 0 . 7, 0 . 8, 1 . 0, 1 . 2' 1 . 5, 2 . 0, 2 . 5, 3 . 0, 4 . 0
1 - 12 1 . 0, 1 . 2, 1 . 5' 2 . 0, 2 . 5, 3 . 0, 4 . 0, 5 . 0, 6 . 0, 7 . 0, 8 . 0,
5
10 . 0, 1 2 . 0
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The one-second thermal rat i ngs are l i sted i n Tabl e I I I .
MODEL
I FC57
TABLE I I I
T IME-OVERCURRENT UNIT {AMPERES )
0 . 5 - 4 . 0
1 . 0 - 12 . 0
ONE-SECOND RATING, ANY TAP K (AMPERES)
128 1 6, 384
260 67, 600
Rat i ng s l ess than one second may be ca l cu l ated accord i ng to the formu l a I = viK/T, where T i s the t i me i n seconds that the current f l ows .
The cont i nuou s rat i ngs for the t i me-overcurrent un i t are shown i n Tabl es I V and V .
TABLE IV 0 . 5 - 4 .0 AMPERE RANGE RAT INGS
MODEL I FC57
TAP 0 . 5, 0 . 6, 0 . 7, 0 . 8, 1 . 0, 1 . 2, 1 . 5,
CONT . CURR . 2 . 3, 2 . 5, 2 . 6, 2 . 9, 3 . 3, 3 . 6, 4. 1,
TABLE V 1 . 0 - 12 . 0 AMPERE RANGE RAT INGS
MODEL I FC57
TAP 1 . 0, 1 . 2' 1 . 5' 2 . 0, 2 . 5,
CONT . CURR . 3 . 9, 4 . 3, 4 . 8, 5 . 3, 6 . 2,
H I GH-SE ISM I C INSTANTANEOUS UNIT { I FC57BD }
3 . 0,
6 . 8,
4 . 0, 5 . 0, 6 . 0,
7 . 8, 8 . 8, 9 . 7,
2 . 0, 2 . 5, 3 . 0, 4 . 0
4. 7, 5 . 3, 5 . 8, 6 . 8
7 . 0, 8 . 0, 10 . 0, 12 . 0
10 . 4, 1 1 . 1' 12 . 4, 1 3 . 6
The i nstantaneou s co i l i s tapped for operat i on at e i ther one of two ranges ( H or L) . The pos i t i on of the link located on the top of the support structure determi nes whether the range i s h i gh or l ow. See F i gure 2 and Table VI .
TABLE VI
H I GH-SE I SM I C tt CONTI NUOUS tttONE-SECOND INSTANTANEOUS LINK RANGE RAT ING RAT ING K UNI T {AMPS } POS IT ION {AMPS) {AMPS ) {AMPS )
2 - 50 L 2 - 10 3 . 7 1 30 1 6, 900 H 10 - 50 7 . 5
6 - 1 50 L 6 - 30 10 . 2 260 67, 600 H 30 - 150 19 . 6
tt The range i s approxi mate, wh i ch means that the 2- 10, 10-50 may be 2-8, 8 -50 . There wi l l a l ways be at l east one ampere overl ap between the maxi mum L and the m i n i mum H sett i ng . Whenever pos s i b l e, be sure to se l ect the h i g her
range i n order to obtai n the h i gher cont i nuous and short-t i me rat i ngs . ttt H i g her currents may be app l i ed for shorter l engths of t i me i n accordance
wi th the formu l a: I = viK/T
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S i nce the i nstantaneous-un i t co i l i s i n ser i es wi th the t i me-overcurrent-un i t coi l , see Tabl es I I I , I V, V and V I to determi ne the current- l i m i t i ng e l ement for both conti nuou s and short-t i me rat i ngs .
H I GH-SE I SM I C TARGET AND SEAL- IN UNIT
Rat i ng s for the target and seal - i n u n i t are shown in Tabl e VI I .
TABLE VI I
TAP
0 . 2 2 . 0
DC Res i stance + 10% { Ohms ) 8 . 0 0 . 24
M i n i mum Operat i ng {Amp ) +0 -60% 0 . 2 2 . 0
Carry Cont i nuous (Amperes ) 0 . 3 3
Carry 30 Amps for ( Second s ) 0 . 03 4
Carry 10 Amps for ( Seconds ) 0 . 25 30
60 Hertz Impedance {Ohms ) 68 . 6 0 . 7 3
I f t he tr i pp i ng current exceeds 30 amperes anauxi l i ary re l ay should be used, the connect i ons bei nf such the tr ipp i ng current does not pas s through the contacts or the target and seal - i n co i l s of the protecti ve re l ay .
CONTACTS
The current-c l os i ng rati ng of the contacts i s 30 amperes for voltages not exceed i ng 250 vol ts . The current-carry i ng rat i ng i s l im i ted by the rat i ngs of the seal - i n u n i t .
BURDENS
Burdens for the t i me-overcurrent un i t are g i ven i n Tabl e VI I I .
TABLE VI I I
Burdens at M i n . Burdens i n Ohms
Mode l HZ Range M i n Pi ckup M i n . Tap (Z ) T i mes Pi ckup Tap {Ohms ) Amps R Jx z 3 10 20
50 0 . 5 - 4 . 0 0 . 5 2 . 27 7 . 18 7 . 35 3 . 89 1 . 68 1 . 12
I FC57 1 . 0 - 12 . 0 1 . 0 0 . 43 1 . 69 1 . 7 5 0 . 93 0 . 43 0 . 3 1
60 0 . 5 - 4 . 0 0 . 5 2 . 72 8 . 62 9 . 04 4 . 67 2 . 0 1 1 . 34
1 . 0 - 1 2 . 0 1 . 0 0 . 52 2 . 03 2 . 10 1 . 12 0 . 52 0 . 37
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NOTE: The i mpedance val ues g i ven are those for m1mmum tap of each range; the i mpedance for other taps at p i ckup current ( tap rat i ng ) var i es i nverse ly, ( approx i mate ly) as the square of the tap rat i ng . For examp l e, an I FC57 60 hertz re l ay wi th 0 . 5 - 4 . 0 amp range has an i mpedance of 9 . 04 ohms on the 0 . 5 amp tap . The i mpedance of the 2 . 0 amp tap i s 10 . 5/2 . 0 ) 2 x 9 . 04 = 0 . 565 ohms .
The H i gh-Se i sm i c i nstantaneous u n i t burdens ( I FC57BD) are l i sted i n Tab l e I X .
TABLE I X
H i gh- Burdens at M i n . Burdens i n Ohms Se i sm i c M i n . Pi ckup M i n . Tap (Z ) T i mes P i ckup I nst . Un i t Hz L i nk Range Pi ckup (Ohms)
(Amps Pos i t i on (Amps ) (Amps ) R Jx z 3 10 20
2 - 50 60 L 2 - 10 2 0 . 750 0 . 650 0 . 992 0 . 634 0 . 480 0 . 45 7
H 10 - 50 10 0 . 070 0 . 024 0 . 074 0 . 072 0 . 0 7 1 0 . 070
6 - 1 50 60 L 6 - 30 6 0 . 1 10 0 . 078 0 . 1 3 5 0 . 09 5 0 . 08 1 0 . 079
H 30 -150 30 0 . 022 0 . 005 0 . 023 0 . 022 0 . 022 0 . 022
2 - 50 50 L 2 - 10 2 0 . 625 0 . 542 0 . 827 0 . 528 0 . 400 0 . 380
H 10 - 50 10 0 . 058 0 . 020 0 . 062 0 . 060 0 . 059 0 . 058
6 - 1 50 50 L 6 - 30 6 0 . 092 0 . 065 0 . 1 12 0 . 079 0 . 068 0 . 066
H 30 - 150 30 0 . 018 0 . 004 0 . 019 0 . 018 0 . 018 0 . 0 18
CHARACTERISTICS
T I ME -OVERCURRENT UNIT
Pi ckup
P i ckup on these re l ays i s defi ned as the current requ i red to c l ose the contacts from the 0 . 5 t i me d i al pos i t i on . Current sett i ngs are made by means of two mov ab l e l eads that connect t o the tap bl ock at the top of the support structure, see F i gure 1 . The tap b l ock i s marked A through N . See the name p l ate on the re l ay for i ts tap sett i ngs .
Examp l e:
lhe two-amp ( 2 amp) tap for a 1-to-1 2 I FC57 t i me-overcurrent re l ay requ i re s one movabl e l ead i n pos i t i on B and the other i n pos i t i on L .
Operat i ng-T i me Accuracy
The I FC re l ays shou l d operate wi th i n ±7% of the publ i shed t i me curv e . F i gures 5 and 6 show the var i ous t i me-current characteri st i cs for the I FC rel ays . The sett i ng of the t ime d i al determi nes the l ength of the t i me requ i red to c l ose the contacts for a g i ven current . The h i gher the t i me-d i a l sett i ng, the l onger the operat i ng t i me .
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The contacts are just c l osed when the t i me d i al i s set to zero . The maxi mum t i me setti ng occurs when the t i me-d i al i s set to 10 and the d i sk has to trave l i ts maxi mum d i stance to c l ose the contacts .
Reset
The u n i t resets at 90% of the m1n1mum c l os i ng current . Reset t i mes are proport i onate to the t i me-d i al sett i ng s . The t i me to reset to the number 10 t i med i a l pos i t i on when the current i s reduced to zero i s approximate ly 60 seconds for the I FC57 re l ays .
H I GH-S E I SM I C INSTANTANEOUS UNIT ( I FC57BD)
The i nstantaneous un i t has a 25-to-1 range wi th a tapped coi l . There are h i gh and l ow ranges, se l ected by means of a l i nk l ocated on the top of the support structure . See F i g ure 1 . The t i me-current curve for the i nstantaneous uni t i s shown i n F i gure 10 .
H I GH-SE I SM I C TARGET AND SEAL- IN UNIT
The target and seal - i n u n i t has two (2) tap sel ect i ons l ocated on t he front of the u n i t . See F i gure 1 .
RECEIVING, HANDLING AND STORAGE
These re l ays, when not i nc l uded as a part of a control pane l , w i l l be s h i pped i n cartons des i gned to protect them agai nst damage . Immed i atel y upon rece i pt of a re l ay, exami ne i t for any damage sustai ned i n trans i t . I f i njury o r damage resu l t i ng from rough hand l i ng i s evi dent, f i l e a damage c l a im at once wi th the transportat i on company and promptly noti fy the nearest General E l ectr i c Sal es Off i ce . Reasonabl e care shou l d be exerc i sed i n unpack i ng the relay i n order that none of the parts are i njured nor the adjustments d i sturbed .
I f the re l ays are not to be i nstal l ed i mmed i ately, they should be stored i n the i r ori g i nal cartons i n a p l ace that i s free from mo i sture, dust and metall i c ch i p s . Fore i gn matter col l ected o n the outs i de may f i nd i ts way i ns i de when the cover i s removed and cau se troubl e i n the operat i on of the re l ay .
ACCEPTANCE TESTS
Immed i atel y upon recei pt of the re l ay an INSPECTION and ACCEPTANCE TEST shou l d be made to make sure that no damage has been sustai ned i n s h i pment and that the re l ay cal i brat i ons have not been d i sturbed . I f the exami nat i on or test i nd i cates t hat readjustment i s necessary, refer to the sect i on on SERVICING.
These tests may be performed as part of the i nstal l at i on or as acceptance tests, at the d i scret i on of the user .
S i nce most operat i ng compan i e s use d i fferent procedures for acceptance tests and for i nstal l at i on tests, the fo l l owi ng sect i on i nc l udes a l l app l i cabl e tests that may be performed on these re l ays .
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VI SUAL INSPECT I ON
Check the namep 1 ate to make sure that the mode 1 number and rat i ng of the re 1 ay agree w i th the requ i s i t i on .
Remove the re l ay from i ts case and check that there are no broken o r cracked parts or any other s i gns of phys i cal damage .
MECHANI CAL INSPECTI ON
1 . There shou l d be no not i ceabl e fr i ct i on when the d i sk i s rotated s l ow ly c l ockwi se . The d i sk shou l d return by i tse l f to i ts rest pos i t i on .
2 . Make sure the contro l spri ng i s not deformed, nor i ts convo l u t i ons tang l ed or touch i ng.
3 . The armature and contacts of the seal - i n u n i t, as wel l as the armature and contacts of the i nstantaneous uni t, shou l d move free l y when operated by hand . There shou l d be at l east 1/64 i nch w i pe on the i nstantaneou su n i t contacts ( see SERVICING sect i on for seal - i n u n i t ) .
4 . The targets i n t h e seal - i n u n i t and i n the i nstantaneou s u n i t mu st come i nto v i ew and 1 atch when the armatures are operated by hand, and shou 1 d unl atch when the target rel ease button i s operated .
5 . Make sure that the brushes and short i ng bars agree w i t h the i nterna 1-connect i ons d i agram.
6 .r------------------------------------------------------------. CAUTION
Should there be a need to tighten any screws, DO NOT OVER TIGHTEN, to prevent stripping.
DRAWOUT RELAY TESTING
I FC rel ays may be tested wi thout removi ng them from the panel by u s i ng e i ther the 12XCA28Al or 12XCA 1 1Al test probes . The test probes make connecti ons to both the re l ay and the external c i rcu i try, wh i ch prov i des max i mum f l ex i bi l i ty, but requ i re s reasonabl e care s i nce a CT short i ng jumper i s necessary when test i ng t h e re l ay . The test probes are d i fferent i n the number of connect i ons that can be made . The 12XCA28Al has a f u l l comp 1 ement of 28 connect i ons and the 12XCA 1 1Al has fou r . Refer to i nstruct i on book GEK-49803 for add i t i onal i nformat i on
POWE R REQU I REMENTS, GENERAL
Al l devi ces operat i ng on al ternat i ng current {AC ) are affected by frequency . S i nce non- s i nuso i d al waveforms can be analyzed as a fundamental frequency p l u s harmoni cs of that fundamental frequency, i t fo l l ows that a l ternat i ng-cu rrent dev i ces ( re l ays) w i l l be affected by app l i ed waveforms . AC re l ays ( and AC dev i ces i n general } are s i gn i f i cant ly affected by the app l i cat i on of non-s i nu so i da l waveforms .
Therefore, i n order to test AC re l ays properly i t i s essent i a l to u se a test vol tage and/or current waveform that i s s i nu so i dal . The pur i ty of the s i ne wave
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( i . e . , i ts freedom from harmon ics ) cannot be expre ssed as a fi n i te number for any part i cu l ar re l ay; however, any re l ay u s i ng tuned c i rcu i ts, RL or RC networks, or saturati ng e l ectromagnets ( such as t i me-overcurrent rel ays ) wou l d be espec i al l y affected by non- s i nusoi dal wave forms .
T IME-OVERCURRENT UNIT
Rotate the t i me d i al s l owly and check, by means of a l amp i n the c i rcu i t, that the contacts just c l ose at the zero (0 ) t i me-d i al sett i ng .
The poi nt at wh i ch the contacts just c l ose can be adju sted by runni ng the stat i onary contact brush i n or out, by means of i ts adjust i ng screw .
W i th the contacts ju st c l os i ng at No . 0 t i me sett i ng, there shou l d be suffi c i ent gap between the stat i onary contact brush and i ts metal back i ng str i p to ensure approx imatel y 1/32 i nch w i pe .
The m i n i mum current at wh i ch the contacts wi l l c l ose i s determi ned by the tap sett i ng i n the tap b lock at the top of the support structure . See CHARACTERISTICS sect i on .
The p i ckup of the t ime-overcurrent tap sett i ng i s adju sted by means of a spri ngad justed r i ng . See F i gure 1 . The spri ng-adju sted r i ng e i ther wi nds or unwi nds the sp i ral control spr i ng . By turn i ng the r i ng, the operat i ng current of the u n i t may be brought i nto agreement w ith the tap setti ng emp l oyed, i f th i s ad justment has been d i sturbed . Th i s adjustment al so permi ts any des i red sett i ng i ntermed i ate between the var i ous tap setti ngs to be obtai ned . If such adju stment i s requ i red, i t i s recommended that the h i g her tap be used . I t shou l d be noted that the re l ay wi l l not necessar i ly agree wi th the t i me/current characteri st i cs of F i gure 5 and 6, i f the re l ay has been adjusted to p i ck up at a val ue other than tap val ue, becau se the torque l eve l of the re l ay has been changed .
T i me Setti ng
The sett i ng of the t i me d i al determ i nes the l ength of t i me the u n i t requ i res to c l ose the contacts when the current reaches a predetermi ned val ue . The contacts are just c l osed when the t i me d i al i s set on zero (0 ) . When the t i me d i a l i s set on 10, the d i sk must travel the maxi mum amount to c l ose the contacts, and therefore t h i s sett i ng g i ves the max imum t i me sett i ng .
The pri mary adju stment for the t i me of operat i on of the un i t i s made by means of the t i me d i a l . However, further ad ju stment i s obtai ned by mov i ng the permanent magnet al ong i ts support i ng she l f; mov i ng the magnet toward the d i sk and shaft decreases the t i me, wh i l e mov i ng i t away i ncreases the t i me .
P i ckup Test
Set the rel ay at the 0 . 5 t i me-d i al pos i t i on and the lowest tap . Us i ng the test connect i ons i n F i gure 12 the mai n uni t shou l d c l ose the contacts wi th i n ±3% of tapval ue current for 60 hertz re l ays, and wi th i n ±7 . 5% of tap-val ue current for 50 hertz re l ays .
T i me Test
Set the re l ay at the No . 5 t i me-d i al setti ng and the l owest tap . U s i ng the test connect i on i n F i gure 12, app ly fi ve t i mes ( 5x) tap current to the re l ay . The re l ay operat i ng t i mes to c l ose i ts contact are l i sted i n Tabl e X.
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TABLE X
RELAY Hz T I ME (SECONDS) M INIMUM MAXIMUM
I FC57 60 9 . 35 9 . 65
50 9 . 1 5 9 . 85
H I GH-SE I SM I C INSTANTANEOUS UNIT ( I FC57BD )
Make sure that the i nstantaneou s un i t i s i n the correct pos i t i on for the range i n wh i ch i t i s to operate . See the i nternal -connect i on d i agram, F i gure 4, and connect as i nd i cated i n the test c i rcu i t of F i gure 1 3 . Whenever poss i bl e use the h i g her range, s i nce the h i gher range has a h i gher cont i nuous rat i ng .
Sett i ng the H i gh-Se i sm i c I nstantaneou s Un i t
The i nstant u n i t has an adju stabl e core l ocated at the top of the u n i t, as shown i n F i gure 1 . To set the i nstantaneou s uni t to a des i red p i ckup, l oosen the l ocknut and adju st the core . Turni ng the core c l ockwi se decreases the p i ckup, turn i ng the core counterc l ockwi se i ncreases the p i ckup . Bri ng up the current s l owly u nt i l the u n i t p i ck s u p . I t may necessary to repeat th i s operat i on, unt i l the des i red p i ckup val ue is obta i ned . Once the des i red p i ckup va l ue i s reached, t i g hten the l ocknu t .
CAUTION
Refer to Table VI for the continuous and one-second (1 sec) ratings of the instantaneous unit. Do not exceed these ratings when applying current to the instantaneous unit
The range of the i nstantaneous u n i t (See Tabl e VI ) mu st be obtai ned between a core pos i t i on of 1/8 of a turn of fu l l c l ockwi se and 20 turns counterc l ockwi se from the fu l l c l ockwi se pos i t i on . Do not l eave the core i n the fu l l c l ockwi se pos i t i on.
H I GH-SE I SM I C TARGET AND SEAL- IN UNIT
The target and seal - i n un i t has an operat i ng coi l tapped at 0 . 2 and 2 . 0 amperes . The re l ay i s s h i pped from the factory wi th the tap screw i n the h i g her ampere pos i t i on . The tap screw i s the screw ho l d i ng the r i g ht-hand stat i onary contact . To change the tap sett i ng, f i rst remove one screw from the l eft-hand stati onary contact and p l ace i t i n the des i red tap . Next remove the screw from the unde s i red tap and p l ace i t on the 1 eft-hand stat i onary contact where the f i rst screw was removed . See F i gure 1 . Th i s procedure i s necessary to prevent the r i ght-hand stat i onary contact from gett i ng out of adju stment . Screws shou l d never be l eft i n both taps at the same t ime .
P i ckup and Dropout Test
1 . Connect rel ay stud s 1 and 2 (See the test c i rcu i t of F i gure 14) to a DC source, ammeter and l oad box so that the current can be control led over a range of 0 . 1 to 2 . 0 amperes .
2 . Turn the t i me d i a l to the ZERO t ime-d i al pos i t i on .
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3 . Increase the current slowly unt i l the seal-i n un i t p i cks up . See Table XI .
4 . Move the t i me d i al away from the ZERO t i me-di al pos i t i on; the seal- i n un i t should remai n i n the p i cked up pos i t i on .
5. Decrease the current slowly unt i l the seal- i n un i t drops out . See Table XI .
Table XI
TAP P ICKUP DROPOUT CURRENT CURRENT
0. 2 0. 12 - 0. 20 0. 05 or more
2. 0 1. 2 - 2. 0 0. 50 or more
INSTALLATION
The relay should be i nstalled i n a clean, dry locati on, free from du st, and well l i g hted to fac i li tate i nspect i on and test i ng .
The relay should be mounted on a vert i cal surface . The outli ne and panel dr i lli ngs are shown i n F i gures 16 and 17. F i gure 16 shows the semi -flu s h mount i ng, and F i gure 17 shows var i ous methods of surface mounti ng .
The i nternal-connect i on d i agrams for the relay are shown i n F i gures 3 and 4. Typ i cal external connect i ons are shown i n F i gure 7.
INSTALLAT ION TESTS
The followi ng tests are to be performed at the t i me of i nstallati on:
T i me-Overcurrent Un i ts
Set the tap block to the des i red tap sett i ng and the t ime d ial to the 0 . 5 pos i t i on . U s i ng the test c i rcu i t i n F i gure 12, gradually apply current unt i l the contacts just close . Th i s value of current i s def i ned as p i ckup and should b e within 3% of tap value for 60 hertz relays, and w i th i n 7 . 5% of tap value for 50 hertz relays .
Check the operat i ng t i me at some multi ple of tap value and the des i red t i me-d i al sett i ng . Th i s mult i ple of tap value may be f i ve t i mes (5x) tap rat i ng, or the maxi mum fault current for wh i ch the relay must coordi nate . The value used i s left to the d i screti on of the u ser .
H i gh-Se i smi c Target and Seal- In Un i t
1. Make sure that the tap screw i s in the des i red tap .
2. Perform p i ckup and dropout tests as outli ned i n the ACCEPTANCE TESTS section .
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H i gh-Se i sm i c I nstantaneou s Un i t ( I FC57BD)
1 . Se 1 ect the des i red range by sett i ng the 1 i nk i n the proper pos i t i on . ( See F i gure 1 and the i nternal-connect i ons d i agram) . Whenever pos s i ble, be sure to select the h i gher range, s i nce i t has a h i g her cont i nuous rat i ng .
2 . Set the i nstantaneou s un i t to p i ck u p at the des i red current level. See Sett i ng the H i gh-Se i smi c I nstantaneou s Un i t i n the ACCEPTANCE TESTS sect i on .
A 11 the tests descri bed above under INSTALLATION TESTS mu st be performed at the t i me of i nstallat i on . I n addi t i on, i f those tests descri bed under the ACCEPTANCE TESTS sect i on were not performed pri or to i nstallat i on, i t i s recommended they be performed at t h i s t i me .
PERIODIC CHECKS AND ROUTINE MAINTENANCE
I n v i ew of the v i tal role of protect i ve relays i n the operat i on of a power system, i t i s i mportant that a per i odi c test program be followed . I t i s recogni zed t hat the i nterval between per i odi c checks w ill vary, dependi ng upon envi ronment, type of relay and the user's experi ence w ith per i od i c test i ng . Unt i l the u ser has accumulated enough experi ence to select the test i nterval best su i ted to h i s i ndi v i dual requ i rements, i t i s suggested that the poi nts li sted below be checked at an i nterval of from one to two years .
These tests are i ntended to make sure that the relays have not dev i ated from the i r or i g i nal sett i ng s . I f devi at i ons are encountered, the relay must be retested and serv i ced as descri bed i n th i s manual.
T IME-OVERCURRENT UNIT
1. Perform p i ckup test for the tap sett i ng i n serv i ce, as descri bed i n the INSTALLATION sect i on.
2. Perform the t i me tests, as described in the INSTALLATION section.
HI GH-SE I SM I C INSTANTANEOUS UNIT ( I FC57BD)
1 . Check that the i nstantaneous un i t p i cks u p at the des i red current level, as outli ned i n the ACCEPTANCE TESTS sect i on .
H I GH-SE I SM I C TARGET AND SEAL- IN UNIT
1. Check that the un i t p i cks up at the values shown i n Table XI .
2 . Check that the un i t drops out at 25% or more of tap value .
CONTACT CLEANING
For clean i ng relay contacts, a flex i ble burn i sh i ng tool should be u sed . Th i s cons i sts of a flex i ble str i p of metal wi th an etch-roughened surface, resembli ng i n effect a superf i ne f i le . The poli sh i ng act i on i s so deli cate that no scratches are left, yet i t wi ll clean off any corros i on thoroughly and rap i dly . I ts flex i b i li ty
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ensures the cleani ng of the actual poi nts of contact. Do not use k n i ves, f i les, abras i ve paper or cloth of any k i nd to clean relay contacts.
*COVER CLEANING
The clear Lexan® cover should be cleaned w i th a soft cloth and water only. No cleani ng solut i ons should be used. Use of clean i ng solu t i ons may damage the clear cover.
® Lexan i s a reg i stered trademark of the General Electri c Company
SYSTEM TEST
Although t h i s i nstruct i on book i s primar i ly wri tten to check and set the I FC relay, overall funct i onal tests to check the system operat i on are recommended, at i ntervals based on the customer1 s experi ence.
SERVICING
T IME OVERCURRENT UNIT
If i t i s found dur i ng i nstallat i on or per i odi c test i ng that the t i me-overcurrent u n i t i s out of l im i ts, the un i t may be recali brated as follows:
P i ckup Test
Rotate t i me d i al to No. 0 t i me-d ial setti ng and check, by means of a lamp i n the c i rcu i t, that the contacts ju st close.
The poi nt at wh i ch the contacts just close can be adjusted by runni ng the stat i onary contact brush i n or out, by means of i ts adju st i ng screw. Th i s screw should be held securely i n i ts support.
W i th the contacts just clos i ng at No. 0 t i me sett i ng, there should be suff i c i ent gap between the stat i onary contact brush and i ts metal back i ng str i p to ensure approxi mately 1/32 i nch w i pe.
The p i ckup of the un i t for any current tap sett i ng i s adju sted by means of a spri ng-adju st i ng r i ng. By turni ng the r i ng, the operat i ng current of the u n i t may be brought i nto agreement w i th the tap sett i ng employed i f, for some reason, this adjustment has been di sturbed. Th i s adjustment also permi ts any des i red sett i ng i ntermediate between the var i ous tap sett i ngs to be obtai ned. If such adjustment i s requ i red, i t i s recommended that the h i gher tap sett i ng be used. I t should be noted t hat the relay w i ll not necessar i ly ag ree w i t h t h e t i me/current characteri st i cs of F i gures 5 and 6, i f the relay has been adju sted to p i ck up at a value other than tap value, becau se the torque level of the relay has been changed.
Connect the operati ng coi l termi nals to a source of the proper frequency and good waveform, hav i ng a voltage of 1 10 or more, w i th res i stance load boxes for sett i ng the current. See Test C i rcu i t, F i gure 12.
Wi th the tap block set for the lowest tap and the t i me d i al set where contacts are just open, adjust the control spri ng to just close the contacts w i th i n the l i mi ts
*Rev i sed s i nce last i s sue
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given below, which are ±1% of the tap amps . See Table XI I .
TABLE XI I
TAP RANGE TAP M IN . AMPS MAX. AMPS
0 . 5 - 4 0 . 5 0 . 49 5 0 . 505
1 . 0 - 1 2 . 0 1 . 0 0 . 99 1 . 0 1
I t should never be necessary to wind up the control-spring adju ster more than 30° ( one notc h ) , nor unwind it more than 120° ( three notche s ) from the factory setting, to obtain the above pickup setting .
Time Tests
With the tap block set for the lowest tap and the time dial at No . 5 setting, apply five times ( 5x) tap current to the relay .
Adju st the position of the drag magnet assembly to obtain an operating time as near as pos sible to 9 . 50 but at least within the range listed in Table X I I I .
TABLE XI I I
T IME (SECONDS)
RELAY MINIMUM MAXIMUM
I FC57 9 . 4 9 . 6
The drag-magnet assembly should be approximately in the middle of its travel. The drag-magnet assembly is adju sted by loosening the two screws securing it to the support structure . See Figure 1 . Moving the drag magnet towards the disk and shaft decreases the operating time, and moving the drag magnet away from the disk and shaft increases the operating time . The screws securing the drag magnet assembly to the support structure mu st be tight before proceeding with other time check s .
MECHANI CAL ADJUSTMENT
The disk does not have to be in the exact center of either air gap for the relay to perform correctly . Should the disk not clear all gaps, the following adju stment can be made .
1 . Determine which way the disk mu st be aligned to clear all gap surfaces by 0 . 010 inches .
2 . Remove the drag-magnet assembly, by loosening the two screws securing it to the support structure . The screw need not be removed .
3 . Loosen slightly the upper pivot-bearing set screw ( 1/ 1 6 inch hex wrenc h ) , s o t h e upper pivot can move freely . Do not remove the set screw from the support structure .
4 . Loosen the jewel-bearing set screw as in 3 above .
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5 . App ly a s l i ght downward f i nger pressure on the upper p i vot, and turn the jewel -beari ng screw, from the unders i de of the support structure, to pos i t i on the di sk as determi ned in 1 above .
6 . Turn the jewe l -beari ng screw 1/8 turn c l ockwi se and t i ghten the upper p i vot set screw to 2 . 5- 3 . 5 i nch-pounds of torque .
7 . Turn the jewe 1-beari ng screw 1/8 turn counterc 1 ockwi se . Th i s w i 1 1 1 ower the di sk-and-shaft assembly approxi matel y 0 . 005 i nch and perm i t proper end p l ay . The shaft must have 0 . 005-0 . 010 i nch of end p l ay .
8 . T i ghten the jewe l -beari ng set screw to 2 . 5-3 . 5 i nch pounds of torque.
9 . Rotate the di sk through the e l ectromagnet gap . The di sk shou l d c l ear the gap surfaces by 0 . 010 i nch and be w i th i n 0 . 005 i nch flatnes s . If the di sk i s not w i th i n 0 . 005 i nch f l atness, the di sk shou l d be repl aced .
10 . Re i nstal l the drag magnet assembly and check that the d i s k has at l east 0 . 0 10 i nch c l earance from the drag-magnet-assembl y surfaces .
1 1 . T i ghten the drag magnet assembly mount i ng screws w i th 7- 10 i nch pounds of torque, after securely seat i ng the assembly and pos i t i on i ng i t accordi ng to the t ime test above .
H IGH-SE I SM I C INSTANTANEOUS UNIT ( I FC57BD)
1 . Both contacts shou l d c l ose at the same t i me .
2 . The back i ng str i p shou l d be so formed that the forked end ( front ) bears agai nst the mol ded str i p under the armature .
3 . Wi th the armature agai nst the pol e p i ece, the cross member of the 11T" spri ng shou l d be i n a hori zontal p l ane, and there shou l d be at l east 1/64 i nch wi pe on the contacts . Check th i s by i nsert i ng a 0 . 010 i nch fee l er gage between the front hal f of the shaded pol e and the armature, w i th the armature h e l d c l osed. The contacts shou l d c l ose wi th the fee l er gage i n p l ace .
4 . S i nce mechani cal adju stments may affect the se i sm i c frag i l i ty l ev e l , i t i s adv i sed that no mechani cal adjustments be made i f se i smi c capabi l i ty i s of concern .
H I GH-SE I SM I C TARGET AND SEAL- IN UNIT
The l eft contact mu st make before the r i ght contact
To check the wi pe of the sea 1- i n uni t. i nsert a fee 1 er gage between the res i dua 1 button of the armature and the front end of the pol e p i ece . The l eft contact shou l d c l ose w i t h a 0 . 0 1 5 ± 0 . 002 fee l er gage, and the r i ght contact wi th a 0 . 010 ± 0 . 002 feel er gage .
S i nce mechani cal adjustments may affect the se i sm ic frag i l i ty l eve l , i t i s adv i sed that no mechani cal adjustments be made i f sei smi c capabi l i ty i s of concern.
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GEK-49948
RENEWAL PARTS
It is recommended that sufficient quantities of renewal parts be carried in stock to enable the prompt replacement of any that are worn, broken or damaged.
When ordering renewal parts, address the nearest Sales Office of the General Electric Company, specify the quantity required, the name of the part wanted, and the complete model number of the relay for which the part is required .
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F i gure
1
2
3
4
5
6
7
8
9
10
1 1
12
1 3
14
15
* 16
* 1 7
GEK-49948
LIST OF FIGURES
Type I FC57BD Re l ay, Removed from Case, Front Vi ew
Type I FC57BD Re l ay, Removed from Case, Rear Vi ew
I nternal Connect i ons for Re l ay Type I FC57AD, Front V i ew
I nternal Connecti ons for Re l ay Type I FC57BD, Front Vi ew
60 Hertz T i me/Current Characteri sti cs for Re l ay Types I FC57AD and I FC57BD • . . . . . • • • • • . . .
50 Hertz T i me/Current Characteri st i cs for Re l ay Types I FC57AD and I FC57BD . . . . . • . . • . . •
External Connect i ons for I FC57AD or I FC57BD Re l ay
Overtrave l Curves for Re l ay Type I FC57
Trans i ent Overreach Characteri st i cs of the H i gh-Se i sm i c I nstantaneou s Un i t . . . • • . . . . • • • . . . •
. . . .
Page
20
2 1
22
23
24
25
26
27
28
T i me/Current Characteri st i cs of the H igh-Se i smi c I nstantaneous Un i t 29
Test Connecti ons for Test i ng CT Secondary Used wi th the IFC Re l ay 30
Test Connect i ons for Test i ng P i ckup and Operat i ng T imes of the IFC Re l ay T i me-Overcurrent Uni t • . . • • • . • . . . . 3 1
Test Connecti ons for Test i ng P i ckup and Operat i ng T i mes o f the I FC Re l ay Hi gh-Se i smi c I nstantaneou s Uni t . • . . 32
Test Connect i ons for Test i ng the Hi gh-Se i sm i c Target and Seal - I n Uni t Used wi th the IFC Re l ay • • • • • . 33
Cross Secti on of I FC Drawout Case Showi ng Short i ng Bar
Out l i ne and Pane l Dr i l l i ng for Sem i -F l ush i ng Mounti ng of Re l ay Type I FC57 . • • • . . . . • • . • .
34
35
Out l i ne and Panel Dr i l l i ng for Surface Mount i ng of Re l ay Type I FC57 36
*Rev i sed s i nce l ast i ssue
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TOP PIVOT
SEAL-IN TARGET TAP SELECTOR S CREW
SE AL-IN UNIT �,rATIONARY
CONTACT
SEAL-IN TARGET
SHIELD
CONTROL -�'··�....,. SPRING ADJUSTING RING
GEK-49948
TIME OVERCURRENT TAP SElECTORS
INSTANTANEOUS UNIT R ANGE SelECTION L INK
INSTANTANEOUS UNIT ADJUSTABLE CORE
INSTANTANEOUS UNIT
TIME DIAL
M AIN MOVING CONTACT
MAIN STATIONARY BRUSH AND· CONTACT ASSEMBLY
DR AG M AGNET ASSEMBLY
F i gure 1 ( 8043009 ) Type I FC57BD Re l ay, Removed from Case, Front Vi ew
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SUPPORT-�. STRUCTURE
BOTTOM JEWEL BEARING
GEK-49948
U MAGNET AND TAP BLOCK ASSEMBLY TIME OVERCURRENT UNIT
CONTROL SPRING
F i gure 2 (804301 3 ) Type I FC57BD Rel ay, Removed from Case, Rear View
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GEK-49948
T�SI INCUCTic'1N
�ll /UNIT�._ r�s:T T I I
1 ' I !
> � 1 ��I
I I l v l v 1
V* Y* v \1
I* y* ! l l I
l 6 2 i 6 lL'
i I 6 6 0 l 5 I 1
->f.: SHORT FINGER
F i gure 3 ( 0208A8514-1 ) I nternal Connecti ons for Re l ay Type I FC57AD, Front V i ew
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v Y* !
l 1
2 ·'
3 5 INSTANTANEr'.J� 0ETTINGS: . -
GEK-49948
6
SET L1 NK TO "H" FOR H 1'.-H RA "�\;E /.., "�D Tr II L" FOR LOW RANGE. Ll\lK : llCW� ��� HIGH RANGE PO:,ITI � N.
*=SHORT FINGER
T�SI
� I
l v* v* l rl 12
11
I NST. r---1h I
l I
� v*
J* 14
6 13
Figure 4 { 0208A8515- 1 ) I nternal Connecti ons for Relay Typ e IFC57BD, Front View
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1000 ... ...
700
100
...
... 300
200
100
.. .. •
•
•
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3
2
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I
7
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TIME UNIT
4 5 I 1 I I 10
" "' 1'----
�
GEK-49948
20 30 40 50 .. 71 ... !
10 9 B 7 6 5 4 C)
z -3 f-
f-w
2 <.f) ....J <( -0
I LI..J � -I--
II 2
20 HI 40 51 II 70 10M!
MULTIPLES OF PICK UP SETTING
i i I I UUI
Figure 5 (0108889 7 1 ) 60 Hertz Time/Current Characteristics for Re l ay Types I FC57AD and I FC57BD
24
1
1
1
001 001 ... 700
..
...
... 300
...
00 ..
10
70
.. .. ..
..
1 .I .I .7
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..
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0
0
1100 100 80
10
100 500 400
300
200
100 I 0 • 0
0
0 "' Q • 0 z 0 .. u ::: �
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1'- ....... ....... � "' ........__ "'
....... � I" "' �
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T I M E U N I T
GEK-49948
-+Tl' I I
f-.j.. I ·-
I I
1 0 9 8 7 6 5 0 4 z -
.__ 3 .__
w
(fl 2 __j
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I
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.5 .I .7 .I .t 1 3 4 5 I 1 I I 10 20 30 40 50 10 70 1010 !
M U LT I P L ES OF P I C K U P SET TI N G
F i gure 6 ( 010888972) 50 Hertz T ime/Current Characteri st i cs for Re l ay Types I FC57AD and I FC57BD
25
'
- 1000 100 100 100
... 500
1
1
1
... ...
200
00 80 10
10
10
50
40
30
20
.I
.I .1
.I
.I
.. ·'
.2
.1
.. ••
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5 2
<+ J D C T R I P B U S
2
(- )
5 2 � 52 T C
5 1
3
GEK-49948
S O N
C+) ALA R M BU S
I I 5 1 � TSI 1 2 t
1 3 � SON 1 4 . A L A R M OR
R E tv1 0TE I N DI CAT I O N
N OT E : 50 CEVI C E P R F S E N T
O N LY I N \\ 8 0'' MO D E L �
F i gure 7 ( 0275A3836) External Connect i ons for I FC57AD or I FC57BD Re l ay
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tC) z
GEK-49948
5�-------------------------r-------r--� t-� I F C 5 7 � OV E RT R AV E L 0 4 1-----,,---_,-,-----------------,
I ; I � 0 1--z w 3 u a: w 0... z 2
w � I- I _J w > <! a:
i ! !
' ' '----·---- --- ··----·· �--- ----
----r-· _ __,_ __ --1 :ti l
T D . 2
-:jJ: ; T D I
# T O 3
# i T D 5 f� I O t- 0 a: 2 4 6 8 1 0 1 2 1 4 1 6 1 8 20 w > M U L T I P L E S O F P I C K U P 0
F i gure 8 { 0269Al883) Overtravel Curves for Re l ay Type I FC57
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, ...... !..0 c -s (l) 50 1.0
-0 � """" a .-t- oo :::r )> (l) � 1.0 :::C ..c::. ...... I
!..O N :::r ........, I (/)
t-as 1 1 f.«) u a:: UJ c... z -
(l) --i -'• -s VI PI 3 ::::3 -'• VI N () ...... (l) 00
..... ::::3 ::::3 .-t-VI
0 � II 3o 0:: 0:: UJ > 0 . .
M- o PI < ::::l ro M- -s PI -s ::::l ro ro PI O n C :::r VI
20
<= 9 :::::J PI -'• -s rl" p. () 10
rl" (l) -s ...... VI rl" ...... () VI
()
H I SE I �t C RATED I NSTANTANEOUS UN I T
TRAHSI ENT OVERREArn
t--____.__....______.__..J..._--l.._�__JL_�· _ _J -- - - PERCENT OVERREACH = 100 [ y] A= PfCkUP QJRRENT GRActlALL Y APPL I ED B = CURRENT SUDDENLY APPL I ED
i - t - - 1
I ! +
- --�-- I I I - t
I ___J __ _ t - --- - �� L� ! -
II I I
----- --T --- - - i - ---
20
- �
I 30
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- I
40
I I I !
50 ANGLE I N CEffi EES LAG.
1 j-
I . ' i---- - -- -t t - -L- -- ,-- � -- J _ - -�- - - - - ---
. ' I I
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j ; r + ' I I I
i ---r---- 1
I I r � -1 I ' t � ( H I -SEI 5MIC) lu-t
M I N IHJM
P I CK-UP
I
J t � --1 · �
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- �--+-----
60 7tJ � 00
en I'T'I '"' I
-'=" ID ID &
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LJ.J (/)
GEK-49948
I, I i l · ' : I · -- L -�- - - � - - � - - - - - t· ---r--f
I ; i I ' I i l I , I , - ' . __ __._ -- t---L--i . - . . - ----,--- -t I ' I ' I I I I
... +--+- - -+- - --- _._ ·--+-'
' -----'----+- ---+--- ... -� - ·-r - - --�-- --+--
-+·--- --+-- ---+--- - -- -1 '
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< � 0:: :z 0 LL. f-<( LJ.J cr (.!:) LJ.J � � 0::
0
C!J z
� LJ.J (/) 0... ::::;) {5 -0...
0 0 .
�lm003S N l 3W I 1 dn�J i d
F i gure 10 ( 0208A8695- 1 ) T i me/Current Characteri st i cs of the H i gh-Se i sm i c I nstantaneous Un i t
29
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R E L_ . ..:. Y -� 0 I L I N C I I- , C U l T
GEK-49948
R E L A Y C C I :_ N O T I N C I R C U I T
1 2 X G A I I A I L -
Ia 0 F\ E L A y
S I D E ·-- - - ---C A S E S l f" E
9 5 6
T E S T C O N N E C T I O N S F O R T E S T I N G G T � E G C N D A R '( U S E D W I T H T H E I F G R E L A Y
F i gure 1 1 ( 0269A1787- 1 ) Test Connecti ons for Testi ng CT Secondary Used wi th the I FC Rel ay
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GEK-49948
T : S TL r , T T l f/ E: � V.6 t-\ I A R � E k t � :: S i S T 0 R
� .. � N ; M u ' � . . v'( >· - ��: �--�_]---- ----- , _,�)- ---
{- ;::::.- ( -'"\ �} �- ,1 ;::::.- ' 1_ [ ;::::.- r · \ '-- \..- I , , I . '-- � _ ,_ L V O LT S l 2. 0 ��T !=<, A T � [ F h E C v 1
- -- - - - --- - ------ -- - ·'""' Y - \ _ ! _____ _ ___ _ __ _
T C S T O P T I f\� E R
- - �
A T O I � D I C AT I N G 1_ _ - - _ _,. L I G H T W H E N
L t� c_H EC K I � G F I C K U F
K E L A Y -- - - - - � I • 2 T E R M I i j A L S : ---+-- --,
I I
· ) \ / F\ E L. A Y S l f E
: -- . - - -
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0 i_ ______ ------
- ------- ------------ ---�
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,--------- -- -I ! 5 ; �
,---------+----- --+- -
I
_ L ; l_; .. : R E L A Y : S I C E · C A S E I C, j Q � ' �- t_
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T E 5 T G C �H� E C T IC �� �- F � R T E S T I f ; C: F I C K U r A N D C f-: E F\ h T I N G T t i/1 E S C F T H E I F G t\ E L t.Y T i tv1 E U / � !, G U f \ h E N T U f j ! T
F i gure 1 2 (0269A1789 ) Test Connecti ons for Testi ng P i ckup and Operat i ng T i mes of the I FC Re l ay T i me-Overcurrent Uni t
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IY1 1 N I \11 U M REC O M �I!� N D E D V C L T S J I � C AT F\ A T E C F F\ E G. ..
GEK-49948
T O S TA R T T I �.� E 1;
-------------f � �----------------------�
TO STC P T i M E R t TO I N DICAT I N G
- � L I G H T W H E N . � G t-£ C K I N G F I C K U P
R E L AY - -�-1 -1 2 3 4 5 T E F\ M I N A L S : .....----+-----+--------,1 .-----t----___,
( --.____/
R ELAY S I D E
r-- -1 CAS E I S I DE ' C I I I
1 2 X C A I I A I �
0 -- - 1
I i ! ;
u ( "------'
R E LA'f S I D E C � S E S I C E
0 5
/ (
C T J U M P E R
T E S T C C i nJ E G T I C N S FC K T ES T I NG P ! G K U P A N D C P E � P. T i N G T I M E S C F T H E I F G R E L A Y I N S TA N TA N EC U S U N I T
F i gure 1 3 ( 0269Al 788- 1 ) Test Connecti ons for Test i ng P i ckup and Operat i ng T i mes of the I FC Re l ay H i gh-Se i smi c I nstantaneou s Un i t
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D . C . V O L T S
GEK-49948
I I I I
R E L AY -- - - ---- I I 2 T E f� M I N A L S i t --------
1 6 /
( ' R E L A Y ·� • S I D E :- - - - --. l C A S E ' I S I D E
1 2 X C A I I A I -� () I
0 .
T E S T C C N NE C TI C N S F O R T E S T I N G T H E T A R G E T A N D S E A L I N U N I T U S E D 'A' I T H T H E I F C F<. E L AY
F i gure 14 ( 0269Al790) Test Connect i ons for Test i ng the H i gh-Se i sm i c Target and Seal - I n Uni t Used wi th the I FC Re l ay
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C O N N E CTI O N PL U G C O N TACT F I N G E RS
R E L A Y CASE
S H O R TI N G BAR
GEK-49948
UHAWOUT E L EM E N T
S U P P O R T STR U CT U R E
CASE C O N N E CTI O N B L O C K
F i gure 15 (8042 7 1 5 } Cross Sect i on of I FC Drawout Case Showi ng Short i ng Bar
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GEK-49948
� 6.062 ----1 I 15 4t-.�M- I
5 S62 · -1 4 1 MM
7.376 1 87��
l. t=- 1.31 2'" I-35MM _
I "......- S EE , I
3.0 31 � 7 7M M F R O N T V I E W
7. 000 1 7 8MM V I EW "A"
3.6 88 9 4 M M I '
6.75 0 1 7 1 HM
(!) 0 ' .�6 2 14---12-8 M M
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IOJO�IOJO!OIOI loloololololol 1 3 1 -�n <D 0 \
r-. 2.7 6 1 _.., 7 1 � M
R EA R V I E W
S T U D N U MB E R I N G
,, ,, 5.1 2 4 t---- 1 30 MM
2.5 62 6 5t .. H·�
C L TO U T
, I 8 B H LS . 5 M M
MOU N T I N<3 SU F\FA C E E X T E R NA L
C O N N EC T I ONS I
I C - 32 SC R E W S 5.6 85 1
SI D E VI EW ---1 4,A��M --, T I E S E MI - F L U S H M OU N T I NG P A N E L O P,J L L I I-.!G _ S U P P O RT
-----S E M I - F LU S H MOU N T I NG O R T I E
WASH E R � A N C H O R
LOC KWA S H E R s - 32 SC R EW - C A B L E �-NU� T T I E
# I O X I / 2 T Y P E 8 T
T H F\ E A D CU T T I N G --� S C R. E W
V l E W "A "' HD W.-0257A 8 549 G - �
C A B L ES II I I
V I E W 0
*F i gure 16 ( 0275A8452 Sh . l [ 3 ] ) Out l i ne and Pane l Dri l l i ng for Sem i - F l u s h Mount i ng o f Re l ay Type I FC57
*Rev i sed s i nce l ast i ssue
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_ L
r-� 6.062 _ 154HM l� <p-
R E L AY
0
7. 3 7 G I
1 8 7 M M -t � I CL '
l I 0 ' F RO N T V I EW
- ·-E XT E R NAL --· CO Nt i E C T I O NS 1 0 -62 SC REWS
MOU N TI N6 ---... S U R FAC E
-l GEK-49948
3.C 6 2 7 6 M M
--� L_ 3.E 8 8 9 4 M M
I _ j
0
:.2.7 8 1 (i_ 7 1 M M 6. 1 2 4 1 4 -- - ---2 - - i 5 6 M M IOIOI0 10i01QJQL I loloiC>Iol8;;Jioloo , 13 ___ ' _ I \- t_ (]) ' <D
R E R V Ew ST U D A 1 N U MBE R I N G OVE R S ic E WAS H E R S
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N U T
E N L A 5_�_J_Q_'{.!IW "e '' H C W. 0 2 5 7A8 5 4 9 G-2
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*F i gure 17 (0257A8452 Sh . 2 [ 3 ] ) Out l i ne and Pane l Dri l l i ng for Surface Mount i ng of Rel ay Type I FC57
*Rev i sed s i nce l ast i ssue
10/89 (A ) GENERAL ELECTRIC METER AND CONTROL BUSI NESS DEPT . , MALVERN , PA 19355
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