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27.00-00ADWG.
27.00-03MARKINGS FOR PAD-MOUNTED TRANSFORMERSSINGLE-PHASE PAD-MOUNTED TRANSFORMER CATALOG NUMBERS 27.00-10
27.00-14SECONDARY SET SCREW CONNECTORS
FUSING GUIDELINES FOR PAD-MOUNTED TRANSFORMERS 27.02-04FUSING GUIDELINES FOR VAULT TRANSFORMERS 27.02-02
UNDERGROUND DISTRIBUTION SPECIFICATIONSUNDERGROUND DISTRIBUTION SPECIFICATIONS 27.00-01
THREE-PHASE OPEN WYE-OPEN DELTA CONNECTION 7200/12470 TO 240/480VPAD-MOUNTED TRANSFORMER 480 VOLT THREE-PHASE THREE WIRE SERVICE 27.05-14B
IDLE TRANSFORMERS 27.00-22
7/7/11 DANNA ELKINSBURLISON
EXTENDED BUSHING INSERT IN LOW PROFILE PAD-MOUNTED TRANSFORMERS 27.05-11
10/29/10 CECCONI GUINN ELKINS
27.00-00BDWG.
THREE-PHASE PAD-MOUNTED TRANSFORMERS GENERAL INFORMATION 27.06-02THREE-PHASE PAD-MOUNTED TRANSFORMER (CONT.) GENERAL INFORMATION 27.06-03LOCATION OF OIL FILLED PAD-MOUNTED TRANSFORMERS 27.06-05PROTECTIVE POLES FOR OIL FILLED PAD-MOUNTED TRANSFORMERS 27.06-06THREE-PHASE PAD-MOUNTED TRANSFORMER WITH CUSTOMER'S SECONDARY
RECOMMENDED NUMBER OF CUSTOMER CONDUCTORS IN SECONDARY27.06-09COMPARTMENT OF THREE-PHASE PAD-MOUNTED TRANSFORMERS
THREE-PHASE PAD-MOUNTED TRANSFORMERS PRIMARY AND SECONDARY WINDING -27.06-28NEUTRAL CONNECTIONS LABELS FOR 3 WIRE SERVICES
THREE-PHASE, THREE-WIRE 480 VOLT SERVICE 27.06-16THREE WIRE SERVICES, FLOATING WYE CONNECTION 27.06-18FOUR WIRE SERVICES, GROUNDED WYE CONNECTION 27.06-22THREE-PHASE PAD-MOUNTED TRANSFORMERS PRIMARY AND SECONDARY WINDING -
27.06-26NEUTRAL CONNECTIONS VARIATIONS FOR 3-WIRE SERVICES
THREE-PHASE TRANSFORMER CONNECTION TO SINGLE-PHASE TRANSFORMER 27.06-30
4/13/11 CECCONI BURLISON ELKINS
7/15/11 CECCONI BURLISON ELKINS
MAKE SURE ELBOW IS GROUNDED. WITH
#4 SD BC GROUND LOOP
5/8" COUPLING
5/8" GND. ROD CLAMP
DEEP DRIVEN
GND. WIRE MUST BEINSTALLED ON OPPOSITESIDE FROM SET SCREW
SECTIONAL ROD
DWG.
27.01-0310/28/10
GROUNDING DETAILS FOR SINGLE-PHASE
LOW-PROFILE PAD-MOUNTED TRANSFORMERS
DETAIL "A" DETAIL "B"
CN 160123
5/8" X 5'GND. RODCN 9220192319
CN 160182CN 060136
CN 9220069244
SEE DETAIL "A"
SEE DETAIL "B"
BONDING PADSEE DETAIL "C"
ACCEPTS 1/2" X 13BONDING PAD
PAD
DETAIL "C"
CONNECTOR (PROVIDED
PMT
SILL
H1A
H1B
0
2
1
APPR.REVISED BY CK'D
3
ELKINSSIMMONS GUINN
A PIECE OF THE
BY OTHER UTILITY)
DETAIL "D"
BAIL-TABEYE
GROUNDINGPAD
INSERT
BUSHINGCLAMP
CONCENTRIC NEUTRALWIRE
#4 CONNECTORCN 162204
ENSURE GROUNDLOOP IS BONDEDTO TANK AT THESE
NOTES:
EQUIPMENT GROUNDING AND BONDING.1. SEE DWG. 20.00-06B FOR ADDITIONAL INFORMATION ON
9/28/11 ELKINSSIMMONS BURLISON
METAL
METALLIC BUSHING CLAMP
MAKE SURE BUSHING INSERT IS BONDED TOMETAL. SEE DETAILS"D" AND "E"
DETAIL "E"PLASTIC BUSHING CLAMP
THREE LOCATIONS
BOND INSERT TOMOUNTING STUD WHENBUSHING FLANGE ISPLASTIC
DWG.7/7/11 DANNA BURLISON ELKINS
NOTES:
27.05-11
EXTENDED BUSHING INSERT IN
LOW PROFILE PAD-MOUNTED TRANSFORMERS
2. ALL LOADBREAK ELBOWS SHALL BE PROPERLY CABLE TRAINED AND FREE TO MOVE TO AN INSULATINGBUSHING (CN 326236) MOUNTED ON A PARKING STAND WHILE USING AN INSULATED ELBOW PULLING STICK.
3. SEE DWG. 27.01-03 FOR PROPER GROUNDING DETAILS.
O
2
1
APPR.REVISED BY CK'D
3
H B1
H A1
SOURCE
LOAD
1. EXTENDED BUSHINGS SHOULD BE USED WHEN SECONDARIES CONTAIN 6 OR MORE RUNS OF 350KCM ORLARGER CABLE.
1 TUA15BUSHINLBEF
BILL OF MATERIALS
CATALOG
152197 BUSHING INSERT, EXTENDED
DESCRIPTION
2
QTY
1
PERCU
NUMBERMACRO UNIT
-
CUITEMNO.
COMPATIBLE UNIT
QTYREQ'D
STANDARD THREE-PHASE, PAD-MOUNTED TRANSFORMERS
THE STANDARD THREE-PHASE PAD-MOUNTED TRANSFORMER IS A DEAD FRONT, LOOP FEED TRANSFORMER.
USING A LOOP FEED UNIT
(CONVERTING LIVE-FRONT TERMINATIONS TO DEAD-FRONT) AS A TEMPORARY "FIX", IT MAY BE MORECONVENIENT TO CUT THE PRIMARY CABLE JUST BELOW THE STRESS CONE AND SPLICE ON A SECTIONOF CABLE AND AN ELBOW IN THE PRIMARY COMPARTMENT OF THE TRANSFORMER. AN OUTAGE SHOULDBE SCHEDULED WITH THE CUSTOMER AT A LATER DATE TO CUT THE PRIMARY CABLE BACK TO A POINTWHERE THE SPLICE(S) MAY BE BURIED. IF CABLES ARE INSTALLED IN CONDUIT(S), THE ENTIRE CABLERUN SHOULD BE REPLACED IF POSSIBLE.
STATIC VOLTAGE
IN THREE-PHASE PAD-MOUNTED TRANSFORMERS IF ONE PHASE IS OPEN ON THE PRIMARY SIDE YOU MAY STILL GET STATIC VOLTAGE READINGS ON THE SECONDARY SIDE OF THE TRANSFORMER DUE TO MAGNETIC FLUX. ANYTIME YOU GET ABNORMALLY HIGH SECONDARY VOLTAGE READINGS ON THE SECONDARY SIDE OF A THREE-PHASE PAD-MOUNTED TRANSFORMER, THE TRANSFORMER MAY BE SINGLEPHASING.
RADIAL FEED TRANSFORMERS ARE NONSTANDARD AND WILL NO LONGER BE PURCHASED.
SECONDARY BUSHING/TERMINALS
1. THE OVERSIZED SECONDARY TERMINALS WE USE PROVIDE A LONG LEVER ARM AND MAKE BREAKAGEOF THE SECONDARY BUSHING EASY. IF EXCESS FORCE IS APPLIED TO THE TERMINAL WHEN CONNECTINGCABLES YOU WILL BREAK THE SECONDARY BUSHING. PLEASE EXERCISE CARE WHEN TIGHTENING UPSECONDARY CABLES.
2. THE PRESENT SECONDARY TERMINALS WE USE ARE PINNED TO THE BUSHING STUD IN ADDITION TOHAVING A JAM NUT. OLDER SECONDARY BUSHINGS DO NOT HAVE THIS JAM NUT. IT IS POSSIBLE TOLOOSEN THE TERMINAL/JAM NUT WHEN CONNECTING CABLES TO THIS UNPINNED TERMINAL. ALWAYSCHECK AND TIGHTEN THE JAM NUT AFTER YOU HAVE FINISHED CONNECTING UP THE CABLES.
EMERGENCY CHANGEOUT OF RADIAL FEED UNITS
THREE-PHASEPAD-MOUNTED TRANSFORMERS
GENERAL INFORMATIONREVISED BY CK'D APPR.
DWG.
1
27.06-02
2
3
0 10/29/10 SIMMONS GUINN ELKINS
7/15/11 DANNA BURLISON ELKINS
REVISED BY CK'D APPR.
DWG.
1
27.06-03
2
3
0
CONNECTING PARALLEL SECONDARIES
ANY TIME PARALLEL THREE-PHASE SECONDARY CONDUCTORS ARE RUN TO THE CUSTOMER OR THE CUSTOMERCOMES TO THE SECONDARY TERMINALS OF THE TRANSFORMER, EACH PARALLEL CONDUCTOR SHOULD BE THESAME LENGTH. HOWEVER, EXCESSIVE CONDUCTOR LENGTH SHOULD BE CUT SO THE CONDUCTORS MAKE ANEAT, SAFE FIT TO THE SECONDARY TERMINALS. WHEN CUTTING OFF EXCESS CONDUCTORS, DIFFERENT LENGTHSCAN BE TRIMMED FROM THE THREE-PHASE CONDUCTORS OR THE NEUTRAL, AS LONG AS ALL CONDUCTORS ON
SINGLE PHASING
PAD-MOUNTED TRANSFORMERS SHOULD NOT BE LEFT TO SINGLE PHASE FOR LONG PERIODS OF TIME. SINGLEPHASING IS AN OUTAGE CONDITION AND SHOULD BE TREATED AS SUCH. PAD-MOUNTED TRANSFORMERSSUBJECTED TO EXTENDED PERIODS OF SINGLE PHASING WILL OVERHEAT DUE TO CIRCULATING MAGNETICCURRENTS.
THE SAME PHASE ARE THE SAME LENGTH.
CABLES SHOULD BE BENT AT THE BOTTOM OF THE SECONDARY COMPARTMENT AND TRAINED TO COME UPSTRAIGHT UNDER THE SECONDARY BUSHING WHERE THEY ARE TO BE CONNECTED. THERE SHOULD BE ENOUGHSLACK IN THE CABLES TO ALLOW FOR TRENCH SETTLEMENT. CUT THE CABLES TO PROPERLY FIT AT THESECONDARY BUSHINGS. ATTACH THE CABLES TO THE SET SCREW BLOCKS STARTING AT THE BACK OF THESECONDARY BUSHING.
THREE-PHASE TRANSFORMERS - MANUAL FAULT INDICATORS SHALL BE INSTALLED ON THE LOAD SIDE PRIMARYCABLES WHEN THE TRANSFORMER IS WITHIN A LOOP SYSTEM OR ON A RADIAL SYSTEM CONTAINING MORE THANONE TRANSFORMER. FAULT INDICATORS ARE NOT REQUIRED ON A SINGLE, RADIAL-FED, THREE-PHASE
SEE DWG. 26.07-08 FOR MORE DETAIL.
8/15/11 SIMPSON SIMPSON ELKINS
ALL CONDUCTORSOF THE SAME PHASEOR NEUTRAL MUSTBE THE SAME LENGTH
TRANSFORMER.
BUILDING WALL
TRANSFORMER PAD
TRANSFORMER
1'-0"1'-0"
4'-0"
3'-0" 4" GALV.STEEL CONDUIT CUT TO
7'-0" LENGTH
FILL 12" DIA.MIN. HOLE AND 4"
DIA. CONDUIT WITH3000 PSI CONCRETEROUND FORM TOP
AND SLOPECONCRETE AT BASE OF POLE
SEE NOTE 1
PLAN VIEW
3" MIN.CONCRETE
STANDARD POLE
DWG.
27.06-06
ALL AROUND
ALL AROUND
REMOVABLE POLE
CONCRETE3" MIN.
BASE OF POLECONCRETE AT
AND SLOPEROUND FORM TOP
3000 PSI CONCRETEDIA. CONDUIT WITH
HOLE AND 4"FILL 12" DIA. MIN.
7'-0" LENGTHSTEEL CONDUIT CUT TO
4" GALV.
3'-0"
4'-0"
NOTES:
2. TRANSFORMER PROTECTION POLES SHOULDBE INSTALLED ON ALL SIDES OF THE TRANSFORMER WHICH ARE SUBJECT TO VEHICULAR TRAFFIC.
3. POLES SHOULD BE PAINTED YELLOW.
4. THESE PROTECTIVE POLES SHALL BE PROVIDEDAND INSTALLED BY THE CUSTOMER.
5" SCH 80 PVC CONDUIT CUT TO
3'-0" LENGTH
6" COMPACTEDSTONE OR GRAVEL
5. CUSTOMER MAY PROVIDE AN ALTERNATE DESIGNFOR A REMOVABLE BARRIER, BUT MUST BEAPPROVED BY THE FIELD ENGINEER.
1'-0"
MAX. 4'-10" MAX. 4'-10"
10/29/10
PROTECTIVE POLES FOR OIL FILLED
PAD-MOUNTED TRANSFORMERSSIMMONS GUINN ELKINS
CN 380216
CN 380216
0
3
2
1
APPR.REVISED BY CK'D
6. ANY SINGLE AND THREE-PHASE PAD-MOUNTED TRANSFORMERS THAT ARE EXPOSED TO PAVED AREAS AND/OR VEHICULAR TRAFFIC SHALL BE HAVE PROTECTIVE BARRIERS PROVIDED AND INSTALLED BY THE CUSTOMER.
SEE NOTE 77. CN 9220151882 (6"X6"X8' CONCRETE POST, GRAY IN COLOR) IS AVAILABLE AS A PROTECTIVE POLE. EXPOSED PART OF POLE TO BE PAINTED WITH "HIGHWAY YELLOW" (OR SIMILAR YELLOW COLOR) CONCRETE PAINT.
1. ON THREE-PHASE PAD-MOUNTED TRANSFORMERS,
2'-0" IN FRONT OF THE TRANSFORMERBETWEEN THE DOORS TO ACCOMMODATETHE DOOR SWING AND SHALL BE REMOVABLE.
THIS POLE SHOULD BE CENTRALLY LOCATED
POLE SHOULD BE LOCATED APPROXIMATELY3'-6" IN FRONT OF THE TRANSFORMER (NO
ON SINGLE-PHASE TRANSFORMERS, THIS
LESS THAN 3').
5'-2"MAXIMUM
5'-2"MAXIMUM
1/27/12 SIMPSON SIMPSON ELKINS
X0
X1 X3
X2
NOTES:
DWG.
27.06-304/13/11 DANNA BURLISON ELKINS
THREE-PHASE TRANSFORMER CONNECTION TO
SINGLE-PHASE TRANSFORMER
1. INSTALL FEED THRU INSERT ON C PHASE OF #2 SIDE (LOAD SIDE) OF THREE-PHASE TRANSFORMER TO
0
3
2
1
APPR.REVISED BY CK'D
H 0 /
X
XFMRPAD
TO
XXXX
2. SINGLE-PHASE TRANSFORMER TO BE RADIAL FED AND LOCATED WITHIN 50' OF THREE-PHASE TRANSFORMER.
FEED THRUINSERT
TO SINGLE-PHASETRANSFORMER
ELBOW ARRESTER
TO THREE-PHASETRANSFORMER
PREVENT CONFLICTS WITH OTHER PHASES DURING SWITCHING.
H1A
H1B
11/11/11 DANNA
3. INSTALL FAULT INDICATOR ON SINGLE-PHASE RADIAL TAP.