EPODUTR006.pdf

GENERAL

Cooper Power Systems three-phase pad-mounted compartmental type distribution transformers are designed to withstand all environmental hazards.

The transformers are designed to meet or exceed all applicable ANSI, NEMA, IEEE standards, and NEC® and CEA specifications.

All transformers are newly manufactured and are produced expressly to meet exacting customer specifications. Many configurations and accessories are available to meet a wide range of application demands.

Transformers from stock are available for any emergency situations that may arise.

Cooper Power Systems three-phase pad-mounted transformers are avail-able in live-front or dead-front designs.

Cooper has proven field service with pad-mounted transformers rated 45-7500 kVA, and high-voltage ratings from 2400 volts up to 46,000 volts.

Designs offered include; delta and wye configurations, with single- or series-multiple combinations with either taps (for de-energized operation), or no-taps. Step-down designs are also available.

Both radial and loop feed configurations are built to ANSI standards. The dead-front bushing configurations are in accordance with ANSI C57.12.26, live-front per ANSI C57.12.22.

Cooper Power Systems transformers are built to exceed ANSI C57.12.28 for tamper resistance and for corrosion resistance. Each transformer is painted using our state-of-the-art painting system which includes eight pretreat-ment stages and seven coating and curing processes.

Transformer cores are manufactured from the highest quality grain oriented silicon core steel. Unlike amorphous metal cores, silicon core steel is less susceptible to ferroresonance and exhibits increasingly greater efficiency above 50% loading. Rectangular wound core construction is used offering lower losses, low excitation current, and quiet operation.

Rectangular stacked core designs are available for 1500 kVA and above.

The best reason to choose Cooper Power Systems three-phase trans-formers is that they have the lowest failure rate in the industry.

STANDARD

CONNECTIONS &

NEUTRAL

CONFIGURATIONS

■ Delta - Wye: For Delta-Wye config-urations the low voltage neutral shall be a fully insulated Xo bushing with a removable ground strap.

■ Grounded Wye-Wye: For Grounded Wye-Wye configurations the high voltage neutral shall be internally tied to the low voltage neutral and brought out as the HoXo bushing in the secondary compartment with a removable ground strap.

■ Delta-Delta: For Delta-Delta config-urations the transformer shall be provided without a neutral bushing.

■ Wye-Wye: For Wye-Wye configura-tions the high voltage neutral shall be brought out as the Ho bushing in the primary compartment and the low voltage neutral shall be brought out as the Xo bushing in the secondary compartment.

■ Wye-Delta: For Wye-Delta configu-rations the high voltage neutral shall be brought out as the Ho bushing in the primary compartment.

No ground strap shall be provided (line to line rated fusing is required).

Distribution Transformers Three-Phase Pad-mounted Compartmental Type

Electrical Apparatus

210-12

1March 1998 • New Issue Printed in U.S.A.

Figure 1.

Three-phase pad-mounted transformer.

vharenyeargs Rectangle

STANDARD FEATURES

■ Bolted cover for tank access

(45-1000 kVA)

■ Welded cover with handhole

(1500-7500 kVA)

■ Three-point latching door for security

■ Lightning arrester mounting provi-sions (live-front)

■ Laser-scribed anodized aluminum nameplate

■ One-inch drain valve with sampling device in low-voltage compartment (45-7500 kVA)

■ One-inch upper fill plug

■ Automatic pressure relief device

■ 20" Deep cabinet (45-1000 kVA)

■ 24" Deep cabinet (1500-7500 kVA)

■ 30" Deep cabinet (34.5/19.92 kV)

■ Removable sill for easy installation

■ Steel divider between high-voltage and low-voltage compartments

■ RTE® (15, 25 kV) 200 A (HTN) bushing wells

■ RTE (15, 25, 35 kV) 200 A Integral bushings (dead-front)

■ Cooper electrical-grade wet-process porcelain bushings (live-front)

■ Lifting lugs (4)

■ Stainless steel ground pads

(45-500 kVA)

■ Stainless steel NEMA 2-hole ground pads (750-7500 kVA)

■ Stainless steel cabinet hinges & mounting studs

OPTIONAL ACCESSORIES

■ Liquid level gauge

■ Pressure vacuum gauge

■ Dial type thermometer

■ R-Temp® less-flammable fluid and other environmentally desirable fluid options

■ One, two, or three On/Off loadbreak switches

■ 4-position loadbreak switch – V-blade switch, T-blade switch

■ Low-voltage 6-, 8-, 10-hole spade

■ Low-voltage 12-, 16-, 20-hole spade (750-2500 kVA)

■ Low-voltage bushing supports

■ RTE (15, 25 kV) high-voltage 200 A bushing inserts

■ RTE (15, 25 kV) high-voltage 200 A feedthru inserts

■ RTE (15, 25 kV) high-voltage 200 A

(HTN) bushing wells with remov-able studs

■ RTE (15, 25, 35 kV) high-voltage 600 A deadbreak one-piece bushings

■ Hexhead captive bolt

■ High-voltage warning signs

■ Ground connectors

■ Drain/sampling valve in high-voltage compartment

■ Breaker mounting provisions

■ Touch-up paint

■ Stainless steel nameplate

■ Stainless steel tank base & cabinet

■ Stainless steel tank base & cabinet sides and sill

■ Service entrance (2 inch) in sill or cabinet side

■ Nitrogen blanket with bleeder and purge valve

■ Delta-wye switch

■ Auxiliary contacts for liquid level gauge

■ Auxiliary contacts for dial type thermometer

■ All copper windings

■ Globe type upper fill valve

■ Kyle® Vacuum Fault Interrupter

(VFI)

■ K-Factor transformer

■ Factory Mutual approved transformer

Three-Phase Pad-mounted Compartmental Type

Figure 2.

Three-phase pad-mounted compartmental type transformer.

HIGH-VOLTAGE BUSHING WELL (200 A)

LOW-VOLTAGE

BUSHING

1.0" UPPER FILL PLUGPRESSURE RELIEF

DEVICE LIQUID LEVEL

GAUGEDIAL TYPE

THERMOMETER

GROUND PAD AND STRAP FOR XO

HIGH SECURITY CABINET

TAP CHANGER

BAY-O-NET FUSE

PRESSURE/VACUUM

GAUGE

NAMEPLATE LASER –

SCRIBED ANODIZED

ALUMINUM

208Y/120 240 Delta 240 Delta with 120 Midtap 480Y/277 480 Delta 600Y/347 Other Voltages Under 600V Other Voltages with 45 kV, 60 kV, 75 kV and 95 kV BIL are also available1

KVA Rating

High-Voltage Low-Voltage Low-Voltage Low-Voltage Ratings (Volts) Ratings (Volts) Ratings (Volts) Ratings (Volts)

208Y/120, 240 480Y/277, 480, 600Y/347 >600

Delta or Wye 2400 45-750 45-750 300-750 4160 45-1000 45-1000 300-1000 4800 45-1000 45-1500 300-1500 7200 45-1000 45-2000 300-2000

12,000, 12,470 45-1000 45-3750 300-7500 13,200, 13,800, 16,340 45-1000 45-3750 300-7500 22,860, 23,900, 24,940 45-1000 45-3750 300-7500

34,500 75-1000 75-3750 300-7500

Wye 43,800 1000 1000-3750 1000-7500

TABLE 4

Range of kVA and Voltage RatingsTABLE 3

Low-Voltage Ratings

Three-Phase 50 or 60Hz 65°C, or 55/65°C Rise kVA Available

45 1000 75 1500

112.5 2000 150 2500 225 3000 300 3750 500 5000 750 7500

TABLE 1

Three-Phase Ratings

1 See Table 5 for ranges of KVA’s with secondaries greater than 600 volts.

Low-Voltage Rating kVA ≤150 kV BIL 200 kV BIL 250 kV BIL

Rating ≤600 V >600 V ≤600 V >600 V ≤600 V >600 V

45-75 1.00-5.00 – 7.25 – 7.75 – 112.5-300 1.20-6.0 5.5 7.25 7.0 7.75 7.5

500 1.50-7.00 5.5 7.25 7.0 7.75 7.5 750-2500 5.75 5.5 7.25 7.0 7.75 7.5 3000-5000 5.75 5.5 7.25 7.0 7.75 7.5

7500 – 6.5 7.25 7.0 7.75 7.5

TABLE 2

Percent Impedance Voltage

Electrical Characteristics of the Completely Assembled Transformer High-Voltage Connectors

60-Hz DryHigh-Voltage Rating One Minute Minimum Phase-to-Ground /Phase-to-Phase BIL Withstand

High-Voltage Ratings (Volts) BIL (kV) (kV) (kV) (kV)

Single High-Voltage 2400 60 8.3/14.4 95 34 4160 60 8.3/14.4 95 34 4800 60 8.3/14.4 95 34 7200 75 8.3/14.4 95 34 12000 95 8.3/14.4 95 34 12470 95 8.3/14.4 95 34 13200 95 8.3/14.4 95 34 13800 95 8.3/14.4 95 34 14400 95 8.3/14.4 95 34 16430 95 8.3/14.4 95 34 22920 125 15.2/26.3 125 40 26400 150 See note 3 See note 3 See note 3

34400 200 See note 3 See note 3 See note 3

34500 200 See note 3 See note 3 See note 3

43800 250 See note 3 See note 3 See note 3

4160GrdY/2400 60 8.3/14.4 95 34 8320GrdY/4800 75 8.3/14.4 95 34 12470GrdY/7200 95 8.3/14.4 95 34 13200GrdY/7620 95 8.3/14.4 95 34 13800GrdY/7970 95 8.3/14.4 95 34 22860GrdY/13200 125 15.2/26.3 125 40 23900GrdY/13800 125 15.2/26.3 125 40 24940GrdY/14400 125 15.2/26.3 125 40 34500GrdY/19920 150 21.1/36.6 150 50

Series Multiple High-Voltage 4160GrdY/2400 x 12470GrdY/7200 60 x 95 8.3/14.4 95 34 4160GrdY/2400 x 13200GrdY/7620 60 x 95 8.3/14.4 95 34 4800 x 13200GrdY/7620 60 x 95 8.3/14.4 95 34 8320GrdY/4800 x 24940GrdY/14400 75 x 125 15.2/26.3 125 40 12470GrdY/7200 x 24940GrdY/14400 95 x 125 15.2/26.3 125 40 13200GrdY/7620 x 24940GrdY/14400 95 x 125 15.2/26.3 125 40 23900GrdY/13800 x 34500GrdY/19920 125 x 150 21.1/36.6 150 50

TABLE 5

High-Voltage and BIL2

2 Transformers are available in the standard ratings and configurations shown or can be customized to meet specific needs.

3 Contact Cooper Power Systems for high-voltage connector information.

vharenyeargs Rectangle

D E

B

F

A*

I

C

F-3 H

G

PAD DIMENSIONS

3.5"

I-3

CABINET/TANK DIMENSIONS

Figure 3.

Transformer and Pad dimensions.

* Add 9" for Bay-O-Net fusing.

65°C DEAD-FRONT - LOOP OR RADIAL FEED - BAY-O-NET FUSING1

Rise OIL FILLED -ALUMINUM WINDINGS kVA OUTLINE DIMENSIONS (in.)

Gallons Approx.

Rating A1 B C D E F G H I Of Fluid Total

Weight (Ibs.)

45 50 68 39 42 26 68 72 43 20 150 2600 75 50 68 39 42 26 68 72 43 20 160 2800

112.5 50 68 49 42 26 68 72 53 20 165 2900 150 50 68 49 42 26 68 72 53 20 170 3350 225 50 72 51 42 30 72 76 55 20 180 3800 300 50 72 51 42 30 72 76 55 20 190 4450 5002 50 89 53 42 30 72 93 57 20 240 5700 7502 64 89 57 42 30 72 93 61 20 380 8200

10002 64 89 59 42 30 72 93 63 20 480 10,100 15002 73 89 86 42 30 72 93 90 24 570 13,950 20002 73 72 87 42 30 72 76 91 24 640 15,000 25002 73 72 99 42 30 72 76 103 24 760 18,850 30002 73 84 99 46 37 84 88 103 24 780 19,000 37502 84 85 108 47 38 85 88 112 24 800 19,500 50002 84 96 108 48 48 96 100 112 24 930 29,400 75002 94 102 122 54 48 102 100 126 24 1580 41,900

TABLE 6

Typical Dimensions and Weights3

65°C LIVE-FRONT - LOOP OR RADIAL FEED - BAY-O-NET FUSING1

Rise OIL FILLED -ALUMINUM WINDINGS kVA OUTLINE DIMENSIONS (in.)

Gallons Approx.

Rating A1 B C D E F G H I Of Fluid Total

Weight (Ibs.)

45 50 64 39 34 30 64 69 43 20 150 2600 75 50 64 39 34 30 64 69 43 20 160 2800

112.5 50 64 49 34 30 64 69 53 20 165 2900 150 50 64 49 34 30 64 69 53 20 170 3350 225 50 64 51 34 30 64 73 55 20 180 3800 300 50 64 51 34 30 64 75 55 20 190 4450 5002 50 81 53 34 30 64 85 57 20 240 5700 7502 64 89 57 42 30 72 93 61 20 380 8200

10002 64 89 59 42 30 72 93 63 20 480 10,100 15002 73 89 86 42 30 72 93 90 24 570 13,950 20002 73 72 87 42 30 72 76 91 24 640 15,000 25002 73 72 99 42 30 72 76 103 24 760 18,850 30002 73 84 99 46 37 84 88 103 24 780 19,000 37502 84 85 108 47 38 85 88 112 24 800 19,500 50002 84 96 108 48 48 96 100 112 24 930 29,400 75002 94 102 122 54 48 102 100 126 24 1580 41,900

TABLE 7

Typical Dimensions and Weights3

1 For fusing with Bay-O-Net only, see Cooper Power Systems catalog section 240-45 or 240-46. (Add 9" to dimension “A” for Bay-O-Net fusing.)

2 Available with Kyle Vacuum Fault Interrupter for overcurrent protection. (Minimum height 72" in.)

3 Weights, gallons of fluid and dimensions are for reference only, and not for construction. Please contact Cooper Power Systems for exact dimensions.

210-12 vharenyeargs Rectangle

CONSTRUCTION

Core High efficiency rectangular wound core design offers low excitation current, low losses, and quiet performance.

Cores are manufactured in either five-leg or triplex configurations from precision-cut single-turn laminations of high quality, grain oriented silicon core steel. Fully annealed after cutting and forming the lamination joints are precisely stacked, virtually eliminating gaps in the corner joints. These cores are less susceptible to ferroresonance and exhibit lower loses above 50% loading than amorphous cores. Stacked core designs are also available.

Coil The coils are made compact, rigid, mechanically strong, and electrically balanced with impedances in accor-dance with ANSI C57.12.26. The wound coils are hydraulically pressed to squeeze the wire and interlayed paper tightly together, then baked to bond the windings into a solid compact coil with excellent dielectric and certified short-circuit strength when tested to ANSI C57.12.90. Extra mechanical strength is provided by diamond pat-tern, epoxy coated paper insulation, used throughout the coil, with additional adhesive at heavy stress points. The diamond pattern distribution of the epoxy and carefully arranged ducts provide a network of passages through which cooling fluid can freely circulate.

The primary coil is manufactured from heavy varnish or paper insulated aluminum or copper wire. Round wire is flattened during winding to provide greater surface contact with the insulat-ing paper and a higher space factor to make a compact, efficient design. The secondary coil is manufactured from full width aluminum strip whose edges are carefully finished to prevent burrs and sharp points, insulated with epoxy-diamond paper between every layer of the conductor. The dielectric insulation levels are per ANSI C57.12.00.

Insulating Fluid Cooper Power Systems transformers are available with standard electrical grade mineral insulating oil or other dielectric coolants manufactured by Cooper Power Systems. The highly refined oil is tested and degassed to assure a chemically inert product with minimal acid ions. Special additives minimize oxygen absorption and inhibit oxidation. To ensure high dielectric strength, the oil is retested for dryness and dielectric strength, refiltered, heated, dried, and stored under vacuum before being added to the completed transformer. R-Temp fluid, manufactured by Cooper Power Systems under strict quality control for optimum transformer cooling charac-teristics, provides higher dielectric strength than mineral oil. The special formulation is less-flammable as defined by the National Electric Safety Code, as well as non-toxic and biodegradable. Envirotemp® FR3 fluid, the fluid used in Envirotran® trans-formers is a fire resistant, natural ester-based fluid. Envirotemp FR3 fluid offers the advantage of a seed oil-based dielectric coolant with food grade additives, in addition to increased fire safety when compared to mineral oil.

R-Temp and Envirotemp FR3 fluid can be used in a pad-mounted trans-former next to buildings or inside buildings with suitable containment provisions.

Vacuum Processing A very low level of moisture is a key factor in the dielectric performance and service life of a transformer.

Cooper has paid extensive attention to moisture removal and it has resulted in improved reliability and the industry’s longest transformer life expectancy.

Cooper’s vacuum process simultane-ously heats and dries the transformer, removing any moisture in the components.

Circulating current, established by energizing the coils under shorted conditions, heats the coils from the inside. Any moisture turns to a gas which is pulled from the chamber by the vacuum. Once the transformer is thoroughly dried, degassed insulating fluid is added while still under vacuum to assure maximum penetration of the fluid into the coil and insulation, minimizing air pockets that can lead to internal corona failure.

Far superior to hot air dryout systems, Cooper’s vacuum processing is care-fully controlled to monitor actual residual moisture levels. This contrasts with simple timing according to theoretically calculated process cycle time, which is subject to variations in effectiveness due to environmental and system variances. The process maximizes dielectric strength and virtually eliminates the potential for insulation damage.

Tank Tanks are formed of precision cut cold-rolled steel. Tank bases are constructed to permit rolling in any direction perpendicular to a tank wall.

Heavy-duty lifting hooks and jack pads are provided. All tanks are pressure tested to withstand 7 psig without permanent distortion.

The interior of the tanks are painted a light gray to enhance visibility of internal components under oil. For 1000 kVA and below a bolted tank cover is standard. This permits thor-ough cleaning and complete painting prior to assembly, reducing the poten-tial for contamination due to welding.

Also, the tank cover is removable for field service without contaminating internal components and insulating oil. Tank covers are domed to facilitate moisture run-off. High-strength cover bolts are enclosed and concealed by a wrap-around cover guard, accessible only from inside the cabinet.

Cabinet Patented high security features exceed ANSI requirements. The inter-locked low-voltage compartment door has a three-point latching mechanism.

Flush-fit doors with concealed latches and heavy-duty stainless steel hinges resist prying or probing. Doors are secured by a captive silicon bronze pentahead bolt.

A 20", 24", or 30" deep cabinet with removable sill is standard depending on kVA rating and accessory configuration. Full height 120° open doors have stops to hold them in the open position for ease of service.

Finish An advanced multi-stage finish process exceeds ANSI standards. An eight-stage phosphate wash pretreat-ment assures coating adhesion and inhibits corrosion. Three-step elec-trodeposited and oven-hardened epoxy primer (E-coat) provides a barrier against moisture, salt, and other corrosives. Polyester powder coat (P-coat) provides resistance to abrasion and impact, and the urethane final coat adds ultraviolet protection.

210-12

THREE-PHASE VFI

TRANSFORMER

The VFI transformer combines a con-ventional Cooper Power Systems dis-tribution transformer with the proven Kyle Vacuum Fault Interrupter (VFI).

This combination provides both volt-age transformation and either trans-former or loop overcurrent protection in one space saving, money saving package.

The three-phase VFI transformer with transformer protection protects the transformer and provides proper coordination with upstream protective devices. When a transformer fault or overload condition occurs, the VFI breaker trips and isolates the transformer, leaving the feeder uninterrupted.

The three-phase VFI transformer with loop protection protects the loop or downstream section of a feeder.

When a fault occurs downstream, the VFI breaker trips and isolates the fault, leaving the transformer load uninterrupted.

The three-phase VFI breaker has independent single-phase initiation, but is three-phase mechanically gang-tripped. A trip signal on any phase will open all three phases.

This feature eliminates single-phasing of three-phase loads. It also enables the VFI breaker to be used as a three-phase loadbreak switch. Because the VFI breaker is resettable, restoring three-phase service is faster and easier.

R-TRAN™ FM APPROVED

TRANSFORMER

Cooper Power Systems’ R-Tran Transformer is FM Approved for indoor locations. Factory Mutual Research Corporation’s approval of the R-Tran transformer line makes it easy to comply and verify compliance with the 1996 National Electrical Code (NEC) section 450-23, Less- Flammable Liquid-Filled Transformer Requirements for both indoor and outdoor locations.

FM Approved R-Tran transformers offer the user the benefit of a trans-former that can be easily specified to comply with NEC, and makes FM Safety Data Sheet compliance sim-pler, while also providing maximum safety and flexibility for both indoor and outdoor installations. Because the “FM Approved” logo is readily visi-ble on the transformer and its name-plate, NEC compliance is now easily verifiable by the inspector.

Three-Phase Pad-mounted R-Tran FM Approved transformers from Cooper Power Systems are manufac-tured under strict compliance with FMRC Standard 3990, and are filled with FM Approved R-Temp fire-resis-tant dielectric coolant.

TESTING

Cooper performs routine testing on each transformer manufactured, utilizing our unique Automated Test Program. This integrated, computer controlled, series of tests provides all routine test data in real time, enabling virtually instant generation of certified test reports. The tests include:

■ Insulation Power Factor: This test verifies that vacuum processing has thoroughly dried the insulation system to required limits.

■ Ratio, Polarity, and Phase Relation: Assures correct winding ratios and tap voltages; checks insulation of HV and LV circuits.

■ Resistance: Verifies the integrity of internal HV and LV connections;

provides data for loss upgrade cal-culations.

■ Routine Impulse Tests: The most severe test, simulating a lightning surge. Applies one reduced wave and one full wave to verify the BIL rating.

■ Applied Potential: Applied to both high-voltage and low-voltage wind-ings, this test stresses the entire insulation system to verify all live-to-ground clearances.

■ Induced Potential: 3.46 times nor-mal plus 1000 volts for reduced neutral designs.

■ Loss Test: These design verifica-tion tests are conducted to assure that guaranteed loss values are met and that test values are within design tolerances. Tests include no-load loss and excitation current along with impedance voltage and load loss.

■ Leak Test: Pressurizing the tank to 7 psig assures a complete seal, with no weld or gasket leaks, to eliminate the possibility of moisture infiltration or oil oxidation

Design performance tests include:

■ Temperature Rise: Our automated heat run facility ensures that any design changes meet ANSI tem-perature rise criteria.

■ Audible Sound Level: Ensures compliance with NEMA require-ments.

■ Lightning Impulse: To assure supe-rior dielectric performance, this test consists of one reduced wave, two chopped waves and one full wave in sequence, precisely simulating the harshest conditions.

We are constantly striving to introduce new innovations to the transformer industry, bringing you the highest quality transformer for the lowest cost. Cooper Power Systems Transformer Products is working towards ISO9001 compliance, emphasizing process improvement in all phases of design, manufacture, and testing. We are so dedicated to introducing new innovations and technologies to the transformer industry we have invested millions of dollars in the Thomas A. Edison Technical Center, our premier research facility in Franksville, Wisconsin. Headquarters for the Systems Engineering Group of Cooper Power Systems, this research facility is fully available for use by our customers to utilize our advanced electrical and chemical testing labs.

P.O. Box 1640 Waukesha, WI 53187 www.cooperpower.com

Printed on Recycled Paper

© 1998 Cooper Power Systems, Inc.

Envirotemp®, Envirotran®, R-Temp®, RTE® and Kyle® are registered trademarks of Cooper Industries, Inc.

R-Tran™ is a trademark of Cooper Industries, Inc.

NEC® is a registered trademark of National Fire Protection Association.

MI

3/98

Three-Phase Pad-mounted Compartmental Type