Oil Circuit Breakers PF Test

8/19/2019 Oil Circuit Breakers PF Test

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Dead-Tank Oil Circuit Breaker

Recommended Tests:Power-Factor Time & TravelContact Resistance

CGE, 253 kV

type FKG


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In Simplified Terms:

Two Bushings Per Phase

Contact Assembl !"nterru#ter$

O#erating Rod !%ertical or Rotar$

"nsulated uide Assembl !O#erating Rod$

A %olume o' Oil

Tank (iner

Oil Circuit Breaker Tests


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Dead Tank OilCircuit Breaker

Bushings

uide Assembl

Tank (iner

Contact Assembl

!"nterru#ter$ (i't Rod

Oil

(i't Rod uide


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) Overall Circuit Breaker Test a* +i, O#en Breaker !+T$

b* Three Closed Breaker !+T$) Tank (oss "nde,

) Bushing Tests

) Oil +am#le Test

) iscellaneous

) Diagnostic

Doble Recommended Tests!inimum$


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Breaker Voltage Rating Test Voltage

./-k% and Above .0

1*2 and 1*/ k% /

/-k% and Below 2

Recommended Doble Test %oltagesOil Circuit Breakers


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Overall Test ProcedureOil Circuit Breakers

Test

No.

Breaker

Position

Test

Mode

Bushing

Energized

Bushing

Floating1 OPEN GS 1 2

2 OPEN GS 2 1

3 OPEN GS 3 !

! OPEN GS ! 3

5 OPEN GS 5 "

" OPEN GS " 5

# C$OSE% GS 1 & 2 '

( C$OSE% GS 3 & ! '

) C$OSE% GS 5 & " '


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O#en Circuit Breaker Test

+tresses3 .$ . Bushing

2$ . "nterru#ter

4$ (i't Rod uide

5$ To# o' (i't Rod !uide

Assembl$

+T round

" &6 eter round (ead

7% (ead

No Low Voltage Lead Reuired


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Closed Breaker Test

+tresses3 .$ 2 Bushing

2$ (ower (i't Rod

4$ Oil

5$ Tank (iner

+T round

" &6 eter round (ead

7% (ead

Oil


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Closed Breaker Test

a8or Contribution o' 6atts-(oss3

Bushing !2$ Oil

(ower (i't-Rod Tank (iner

(esser Contribution o' 6atts-(oss3

Contact Assembl !"nterru#ter$ (i't-Rod uide


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Tank (oss "nde,! T(" $

)Bushings Com#rise the (argest Portion o' the Oil

Circuit Breaker "nsulation +stem

)A Bad Bushing 6ill Be "ndicated in the O#en and

Closed Breaker Tests*

)To Anal:e the Condition o' the "nternal Parts o' the

OCB; Tank (oss "nde, !T("$ was Develo#ed

T(" < Closed Breaker 6atts - !Σ O#en Breaker 6atts $

!For =ach Phase$


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Tank (oss "nde,3 Com#onent Failures

TLI < (ower (i't Rod> Oil >Tank (iner - 2 "nterru#ters - (i't Rod

uides - 2 To# o' (i't Rods

6hat would ha##en to T(" i'3

6ater Content o' the Oil "ncreases@** Carbon is Collecting on the "nterru#ters@ Tank (iner Becomes +aturated 6ith 6ater

(i't Rod uide is Deteriorating Due to Corona Activit@


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uideline Tank-(oss "nde,es !T("$Oil Circuit Breakers

Tank (oss "nde,

Above Between -.0 m6 -.0 m6 to >1*/ m6 Between >1*/ m6 Above

-./ m6 and -./ m% and >./ m6 >./ m6

Above Between -0*.0 6 -0*.0 6 to >0*0/ 6 Between >0*0/ 6 Above

-0*20 6 and -0*20 6 and >0*.0 6 >0*.0 6

"nvestigate Retest ?ormal 'or most Retest "nvestigate

"mmediatel on a more breaker t#es* Place on a more "mmediatel

'reuent basis* on a normal routine 'reuent basis*

test schedule*

(i't-Rod guide assembl; contact (i't rod; Tank Oil; tank assembl !"nterru#ter$; and u##er liner; and au,iliar contact

#ortion o' li't rod* su##ort insulation*

2*/ k%

.0 k%


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Calculating Tank (oss "nde,

TLI# $ CB%& ' (OB%)*OB%!+ $ ,-!./ ' (,-)/)* ,-!!&+ $ ' ,-)0!%

TLIB $ CB%1 ' (OB%.*OB%2+ $ ,-!)2 ' (,-!&)* ,-),/+ $ ' ,-)/.%

TLIC $ CB%3 ' (OB%0*OB%/+ $ ,-)0. ' (,-,&)* ,-,3)+ $ ' ,-,,3%


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Analsis o'

Oil Circuit Breaker Condition


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Check "' Breaker O#erated


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Bushing Problem Found

= T#e 9 Bushings


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Bushing Problem Found

= T#e 9 Bushings


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Check Condition o' Bushings

) Bus"ings Comprise t"e Largest 4ortion of

t"e Oil Circuit Breaker Insulation S5stem

) # Bad Bus"ing %ill S"ow 6p in Bot" t"eOpen and Closed Circuit Breaker Tests


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Tank-(oss "nde,

EXAMPLE # 1 I (A! "atts PF

1 ($%en! 1.1&' '.' '.)1

* ($%en! 1.1&' '.' '.)1

(+losed! *.,'' '.11 '.&'

TLI $ ,-)) ' (,-,& * ,-,&+ $ ' ,-,. watts

Comments: Test results are normal-


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78ample 9! "!mA$ 6atts PF

.!OP=?$ .*./ 0*01 0*.

2!OP=?$ .*2 0*22 .*4

1!C(O+=D$ 2*4 0*.4 0*/

T(" < 0*.4 - !0*01 > 0*22$ < -0*.

Comments3

7igh ?egative T(" E6et "nterru#ter on Bushing ?o* 2

or 7igh (osses ?ear Bushing ?o* 2

a be the (i't Rod uide Assembl

7igh Power Factor on Bushing ?o* 2; Test Bushing to Con'irm

Tank-(oss "nde,


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78ample 9. "!mA$ 6atts PF

.!OP=?$ .*./ 0*01 0*.

2!OP=?$ .*2 0*22 .*4

1!C(O+=D$ 2*4/ 0*2 .*..

T(" < 0*2 - !0*01 > 0*22$ < -0*04

Comments3

?ormal T("

Bushing ?o* 2 a Be Contaminated*

Test Bushing to Con'irm*

Tank-(oss "nde,

k d


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78ample 92 "!mA$ 6atts PF

.!OP=?$ .*2 0*./ .*2/

2!OP=?$ .*2 0*./ .*2/

1!C(O+=D$ 2*4 0*.. 0*5

T(" < 0*.. - !0*./ > 0*./$ < -0*.G

Comments3

7igh ?egative T("

Bushing a Be OH -Test to Con'irm

Possible Problems3)Deteriorated O#erating-Rod uide

)9##er Portion o' (i't Rod)Contaminated "nterru#ter Assemblies

Tank-(oss "nde,

T k ( " d = l DTA


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Tank-(oss "nde, =,am#le - DTA

eneral =lectric

FH-../-/000-I

4 Tanks

Oil Ci i B k T +


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easure "; 6 and PF

Calculate Tank-(oss "nde, !T("$

T(" < Closed OCB 6atts - +um 2 O#en OCB 6atts

PF Corrected 9sing Bushing T#e and Ambient

Tem#erature

"nter#ret Test Results on a Per Phase Basis

Oil Circuit Breaker Test +ummar

6 d d O h " l i b


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6ood and Other "nsulating embers

)The "nsulating Pro#erties o' 6ood or Other

"nsulating embers Can Be easured

)This Dielectric easurement is a %aluable Tool6hen "nvestigating 7igh Power Factors From Other

Dielectric Tests)=,am#le3 7igh ?egative T(" 6hich a "ndicate

a Breaker (i't Rod Problem


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6 d d Oth " l ti b


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6sed

Breaker (i't-Rods3

0*20 6attsJ4 K .0 k%

=9 .2*/ 6J4 K 2*/ k%

Plastic Coated embers3

0*./ 6attsJ4 K .0 k%

=9 LG*/ 6J4 K 2*/ k%

New or 78cellent Condition

0*02 6attsJ4 K .0 k%

=9 L. 6J4 K 2*/ k%

6ood and Other "nsulating embers

Recommended 4ower actor Test Limits3

" t t " ti ti T t


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"nterru#ters - "nvestigative Tests

7ouseholdTin-Foil

Bushing

oveable Contact3 =nergi:e 'or TestBreaker Closed

Bare 6ireTo 7old Foil

in Place

(% (ead !9+T$

" t t " ti ti T t


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4ower actors for Interrupters (;eneral ;uideline+

ood3 .0-40

MuestionableJre area3 40-/0

Bad3 N/0

)Alternate Test ethod3

6ra# Additional Tin Foil Around the Bottom o' the"nterru#ter 6ith the Breaker in the O#en Position

"nterru#ters - "nvestigative Tests

R l T t


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Recloser Tests

)Reclosers Are Tested as Oil Circuit Breakers

)"' 9ne,#ected Results are Obtained; Recloser a

7ave a Resistor Assembl Between (ower Bushing

Terminals)Per'orm Alternate Tests .- b uarding One

Bushing and =nergi:ing the O##osite Bushing on the

+ame Phase

)Alternate Tests "nclude Three 9+T Tests - One PerPhase

Alt t R l T t .


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+T uard

"&6 eter round (ead

7igh %oltage (ead

+tresses . Bushing

(ow %oltage (ead

uard

Alternate Recloser Tests .-

Alt t R l T t .0 .2


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Alternate Recloser Tests .0-.2

9+T

"&6 eter

round (ead

7igh %oltage (ead

+tresses "nterru#ter

Assembl

(ow %oltage (ead

uard

Oil Circuit Breakers PF Test

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