Distribution Transformers: Single-Phase Overhead

Distribution Transformers Electrical Apparatus

201-10

Single-Phase Overhead GENERAL Cooper Power Systems manufactures a complete line of single-phase overhead-type distribution transformers. Single-phase transformers are available as conventional (5-167kVA), completely self-protected (CSP 5-75kVA), or MagneX™ interrupter-protected (5-167kVA) in a variety of ratings to meet or exceed the requirements of applicable ANSI® and NEMA ® standards. Units designed per Rural Utilities Service (RUS) standards are also available. CSP transformers have direct connected primary arresters, secondary circuit breakers, and internal primary voltage fuses. fuses. This eliminates eliminat es the need for separately mounted protective devices and provides reduced installation costs.  The MagneX interrupter is an overcurrent protective device that protects distribution transformers from damaging overloads and secondary faults, and is also used for switching the transformer “on” or “off.”

STANDARD FEATURES n

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Meet or exceeds ANSI ® and NEMA ® standards Meets DOE Energy Efficiency Standard 10 CFR Part 431 for distribution transformers EPRI recommended interlaced coretype design (5-75 kVA) Tank coating exceeds IEEE Std C57.12.31™-2010 standard Cover with a minimum dielectric strength of 8 kV  Tin-plated high and low-voltage bushing terminals to accommodate aluminum or copper conductors Laser-engraved nameplate Wet process porcelain high-voltage bushings resistant to high-voltage corona Tank grounding provisions Envirotemp™ FR3™ fluid or electrical grade mineral oil Heavy-duty lifting lugs and hanger brackets per ANSI® requirements1 Visible cover ground on units with cover-mounted bushings

1Lugs and brackets per ANSI requirements up to 4500 lbs.

0812 • Supersedes 1109

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Recessed tank bottom that offers protection when sliding over rough surfaces Automatic pressure relief device Polymer low-voltage bushings (5-75 kVA) Arrester mounting and grounding provisions Internal mark indicating the proper oil level Permanently stamped secondary leads to ensure proper identification Corrosion-resistant cover band Quality System ISO 9001 certified

OPTIONAL ACCESSORIES n

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Taps either two 2.5 % above and below; four 2.5% below; NEMA ® taps or special taps Externally-operable tap changer switches for safe operation Multiple voltage primaries (5-75kVA) Externally-operable multiple voltage switches for safe operation High corrosion area protection with 304 or 409 stainless steel hardware and tanks MagneX™ interrupter Birdguards Envirotemp™ FR3™ fluid where less-flammable fluid is required and superior environmental characteristics are desired Cover with a minimum dielectric strength of 15 kV  Extra creep high voltage bushings (up to 150 kV BIL) Porcelain low-voltage bushings Canadian Standards Association (CSA) conforming design Special designs conforming to international specifications Drain/sampling valve Pressure vacuum gauge (tank size limitations apply) Filter press connections Temperature gauge (tank size limitations apply) Liquid level gauge (tank size limitations apply) High efficiency transformers at 0.05% or higher above DOE efficiency

Figure 1. Single-phase overhead conventional transformer.

Figure 2. Single-phase overhead conventional conventional transformer.

Figure 3. MagneX interrupter-protected transformer.

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Single-Phase Overhead

COOPERGUARD™ SHIELD

STANDARD BIRDGUARD

ULTRASIL™ POLYMERHOUSED EVOLUTION™  ARRESTER

HIGH-VOLTAGE BUSHING

LIFTING LUGS

SECONDARY BREAKER HANDLE

LOW-VOLTAGE BUSHING GROUND STRAP

OVERLOAD SIGNAL LIGHT 

CORE

COILS

RECESSED BOTTOM

Figure 4. Single-phase overhead CSP transformer.

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201-10 SINGLE-PHASE OVERHEAD CONVENTIONAL Product Scope: kVA: 5-167 Primary Voltage: 2400-19,920 V  Secondary Voltage: 120-600 V 

 A 

C

C

B

B

≥95 kV BIL

≤75 kV BIL1

TABLE 1 Typical Dimensions and Weights 2,3 Dimensions (in.) “A”

1 2 3

“C”1

“B”

kVA

≤75 kV BIL

95 kV BIL

125 kV BIL

150 kV BIL

≤75 kV BIL

≥95 kV BIL

5 10 15 25 37.5 50 75 100 167

26 26 30 31 33 36 39 40 47

32 32 35 38 40 44 51 55 55

42 42 46 48 52 52 54 58 58

45 45 49 51 55 55 57 61 61

281 281 281 301 311 331 331 331 351

17 17 17 20 20 22 24 27 35

 Approx. Weight (Ibs.)

20 20 20 22 24 25 28 31 37

220 220 280 350 450 600 820 1100 1400

Includes sidewall mount H.V. bushings. Includes radiators. Weights, gallons of fluid and dimensions are for reference only, and not for construction. Please contact Cooper Power Systems for exact dimensions.

SINGLE-PHASE OVERHEAD COmPLETELy  SELF PROTECTED C

C

Product Scope: kVA: 5-75 Primary Voltage: 2400-19,920 V  Secondary Voltage: 120-600V 

 A 

B

B

≥95 kV BIL

≤75 kV BIL1

TABLE 2 Typical Dimensions and Weights 2,3 Dimensions (in.) “A”

1 2 3 4

“B”

kVA

≤75 kV BIL

95 kV BIL

125 kV BIL

150 kV BIL

≤75 kV BIL

≥95 kV BIL

5 10 15 25 37.5 50 75 1004 1674

26 26 30 31 33 36 39 40 47

36 36 42 44 46 46 51 55 55

42 42 46 48 52 52 54 58 58

45 45 49 51 55 55 57 61 61

281 281 281 301 311 331 331 331 351

17 17 17 20 20 22 24 27 35

“C” 1

 Approx. Weight (Ibs.)

20 20 20 22 25 26 30 34 40

240 240 300 400 500 600 900 1100 1600

Includes sidewall mount H.V. bushings. Includes Radiators Weights, gallons of fluid and dimensions are for reference only, and not f or construction. Please contact Cooper Power Systems for exact dimensions. MagneX interrupter Only

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Single-Phase Overhead

PROTECTION OPTIONS

QUALITy CONTROL

FLUID OPTIONS

High fire point Envirotemp™ FR3™ fluid for increased fire safety n Secondary breaker with weak link  for secondary fault and overload protection (5-75 kVA) n Primary weak link fuse n Current-limiting fuse for high interrupting ratings and limiting fault currents

Single-phase overhead-type  Transformers can be filled with standard transformers manufactured by Cooper electrical grade mineral insulating oil, Power Systems provide outstanding Envirotemp™ FR3™ fluid, or other performance. All transformers from dielectric coolants. Cooper Power Systems pass tests as prescribed by ANSI® prior to shipment. For fire-sensitive locations, Envirotemp™ FR3™ fluid, a fire Cores and coils are designed for high resistant natural ester-based fluid reliability and low field failure rates. The is recommended. Envirotemp™ domed cover design in conjunction FR3™ fluid also offers the benefits with the formed cover band provides of a soy oil-based dielectric coolant increased pressure withstand capability, that is sustainable and has unique n Low-voltage distribution class MOV  eliminates bushing overhang and environmental and material properties arrester – internally or externally improves cover retention. The highin addition to increased fire safety over mounted voltage bushing design improves conventional mineral oil. gasket protection and seal. The n MagneX interrupter (Primary Breaker) Check with Cooper Power Systems low-voltage polymer bushing virtually with isolation link  for the availability of other dielectric eliminates ultraviolet deterioration with n MagneX interrupter (Primary Breaker) coolants in single-phase, pad-mounted its captured gasket, compression-limiting with partial range current-limiting design. Transformers are designed and transformers. fuse manufactured to be corrosion-resistant. Special attention is given to all welded n Lightning arresters for primary external parts, to avoid moisture over-voltage protection: direct entrapment that can lead to corrosion connected, normal or heavy duty problems. The recessed bottom metal oxide varistor (MOV) either design, as well as the stainless steel internal (VariSTAR™), or external cover band ends, provide corrosion UltraSIL Polymer-Housed Evolution protection in areas that are more or UltraSIL™ Polymer-Housed susceptible to coating damage during  VariSTAR arrester with polymer handling. All coating systems exceed housing. IEEE Std C57.12.31™-2010 standard.  The Quality System at Cooper Power Systems Transformer Products is ISO 9001 certified. n

© 2012 Cooper Industries. All Rights Reserved. Cooper Power Systems, MagneX, VariSTAR, U ltraSIL, Evolution, and CooperGuard are valuable trademarks of Cooper Industries in the U.S. and other countries. You are not permitted to use the Cooper Trademarks without the prior written consent of Cooper Industries. Envirotemp™ and FR3™ are licensed trademarks of Cargill, Incorporated. IEEE Std C57.12.31™-2010 standard is a trademark of the Institute of Electrical and Electronics Engineers, Inc., (IEEE). This publication/product is not endorsed or approved by the IEEE. NEMA ® is a registered trademark of the National Electrical Manufactures  Association.  ANSI® is a registered trademark of the American National Standards Institut e. One Cooper | www.cooperpower.com | Online

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2300 Badger Drive. Waukesha WI 53188