Eaton COOPER POWER Series Installation And Maintenance Instructions Manual
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Eaton COOPER POWER Series Installation And Maintenance Instructions Manual

Eaton COOPER POWER Series Installation And Maintenance Instructions Manual

Three-phase pad-mounted compartmental type transformer
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Distribution
Transformers
MN202001EN
Three-phase pad-mounted compartmental type transformer
installation and maintenance instructions
Effective August 2015
Supersedes S210-12-1 August 2013
COOPER POWER
SERIES

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Summary of Contents for Eaton COOPER POWER Series

  • Page 1 COOPER POWER Distribution Transformers SERIES Effective August 2015 MN202001EN Supersedes S210-12-1 August 2013 Three-phase pad-mounted compartmental type transformer installation and maintenance instructions...
  • Page 2 CONTENTS OF THIS DOCUMENT SHALL NOT BECOME PART OF OR MODIFY ANY CONTRACT BETWEEN THE PARTIES. In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or other- wise for any special, indirect, incidental or consequential damage or loss whatsoever, including but not limited to damage or...

  • Page 3: Table Of Contents

    Contents SAFETY INFORMATION Safety Information ................iv PRODUCT INFORMATION Introduction .

  • Page 4: Safety Information

    FOR LIFE FOR LIFE Eaton meets or exceeds all applicable industry standards relating to product safety in its Cooper Power™ series products. We actively promote safe practices in the use and maintenance of our products through our service literature, instructional training programs, and the continuous efforts of all Eaton employees involved in product design, manufacture, marketing, and service.

  • Page 5: Introduction

    Special procedures must be followed when handling transformer in ambient temperatures below -20 °C. Contact Do not Exceed Transformer Ratings. Transformers your Eaton representative for further instructions. Failure to should be operated only at the ratings specified on the follow special handling procedures may cause premature transformer nameplate.

  • Page 6: Storage

    The tank cover and manhole/handhole cover seals operating a standard transformer at higher altitudes, contact and all gaskets or seals at bushings, gauges, fuses, your Eaton representative. operating devices, etc., should be inspected for evidence of insulating liquid seepage. Repair leaking...

  • Page 7: Pre-Service Inspection (Interior)

    -20 °C. If moisture is present in the liquid, the transformer must Special procedures must be followed when be dried out. Contact your Eaton representative for special energizing a transformer in ambient temperatures instructions on dry-out or other decontamination processes.

  • Page 8: External Connections

    External connections WARNING Hazardous voltage. Can cause severe injury, death, or damage to equipment. Ground transformer following industry-accepted safe grounding practices before making other electrical connections. De-energize power distribution wires that will be connected to transformer. Verify that wires are de-energized at the transformer before connecting to transformer.

  • Page 9: Accessories

    Accessories Liquid temperature gauge Three-phase pad-mounted transformers can be equipped with a variety of optional equipment. Most such accessories are factory installed and no fieldwork is required to prepare them for operation. Liquid level gauge Figure 5. Liquid temperature gauge. Transformers may be furnished with a temperature gauge as optional equipment to indicate the top liquid temperature in the tank in degrees Celsius.

  • Page 10: Pressure-Vacuum Gauge

    Pressure-vacuum gauge Pressure relief device Figure 6. Pressure-vacuum gauge. Figure 7. Pressure relief device. Transformers may be furnished with a pressure-vacuum Transformers may have a cover-mounted pressure gauge as optional equipment to indicate whether the gas relief device (PRD) in addition to the faceplate-mounted space in the tank is under positive or negative pressure.

  • Page 11: Switches And Protective Devices

    Hazardous voltage. Can cause severe injury, death, or remote upstream source. damage to equipment. Eaton’s Cooper Power series Bay-O-Net fuse assemblies are • Do not operate loadbreak equipment if a fault used to protect transformers and distribution systems. The condition is suspected. Doing so can cause an assemblies are mounted on the faceplate of pad-mounted explosion or fire.
  • Page 12 Any equipment that has a suspected failure should not be closed in with the fuse. For additional information on Eaton’s Cooper Power series Bay-O-Net fuse assembly, including loadbreak ratings, refer to catalog section CA132015EN, Service Information MN132003EN, and Service Information MN132002EN.
  • Page 13 Replace fuse link A separate replaceable fuse link, fuse cartridge, and end plug are available for all Eaton Bay-O-Net fuses except catalog numbers 4000358C16CB and C18CB, 4038361C03CB, C04CB, C05CB, and solid link 4038361C10CB. These catalog numbers are integral assembles which include the link, cartridge and end plug.

  • Page 14: Internal Cartridge Fuse

    Internal cartridge fuse WARNING Hazardous voltage. Can cause severe injury, death, or damage to equipment. Turn off power to transformer before servicing internal cartridge fuses. Ground transformer following industry accepted safe grounding practices. Internal cartridge fuses are “weak link” expulsion-type fuses used to protect transformers and distribution systems.

  • Page 15: Internal Loadbreak Switches

    (32 °F) for R-Temp fluid or less than -10 °C (14 °F) for Envirotemp™ FR3™ fluid, viscosity is reduced, which The Eaton’s Cooper Power series external visible loadbreak may reduce make and break capabilities of loadbreak switch is a great way to verify isolation of internal transformer devices.

  • Page 16: Tap-Changer

    Sectionalizing loadbreak switch Move index plate between “loop thru transformer open”” and “line b only” . Eaton’s Cooper Power series sectionalizing loadbreak switch rotates 360° in either direction for alternate source Rotate switch handle counterclockwise to “line b only” .
  • Page 17 The tap-changer shown in Figure 20 can be switched to a new tap position as follows: Verify that tank is grounded. De-energize transformer from a remote upstream source. Ground all bushings and terminals before operating the tap switch. Back out lock screw to clear index plate. Pull handle out to clear index plate.

  • Page 18: Dual-Voltage And Delta-Wye Switch

    Dual-voltage and delta-wye switch WARNING Hazardous voltage. Can cause severe injury, death, or damage to equipment. De-energize transformer from a remote upstream source before operating non- loadbreak tap-changers, dual-voltage switches, or delta-wye switches. CAUTION Excessive current. Can cause damage to transformer winding.

  • Page 19: Vacuum Fault Interrupter (Vfi)

    The VFI transformer uses the same technology used in Eaton’s Cooper Power series VFI pad-mounted switchgear. • Use a hotstick to operate transformer loadbreak equipment.

  • Page 20: Air Switches (Arc Strangler™)

    Operation Instructions for electronic control operation • Use a hotstick to operate transformer loadbreak instructions. equipment. Standard electrical ratings for Eaton VFI transformers are as • After operating transformer loadbreak equipment, follows: check that voltages at transformer terminals are Continuous Current (max) ..... 600 A the expected values.

  • Page 21: Surge Arresters

    Under-oil MOV arrester The Arc-Strangler loadbreaking device is a spring-loaded Eaton’s Cooper Power series heavy-duty distribution-class sliding sleeve that extinguishes the arc drawn between the under-oil MOV arrester is designed to be mounted inside mounting contacts and the fuse conductor when the fuse the transformer tank (see Figure 25).
  • Page 22 Under-oil arrester disconnection during test (with Under-oil arrester disconnection during test (with- arrester disconnect switch) out arrester disconnect switch) Eaton’s Cooper Power series arrester disconnector CAUTION provides a means of disconnecting and reconnecting an under-oil arrester ground for transformer testing. Separate...

  • Page 23: Maintenance

    External arrester Tank internal maintenance (For Envirotran ® Transformers see the Envirotran External surge arresters ordered with the transformer Transformers section of this manual before continuing) must be installed and connected in the field before the transformer is put into service. CAUTION Arrester and tank ground connections must be completed Elevated Pressure.
  • Page 24 Bolt-On manhole/handhole cover removal Transformers that have been system-connected should be de-energized, grounded, and disconnected before being Transformer tanks are factory-sealed to prevent ingress opened for inspection. of ambient air and moisture. Do not open under any precipitation conditions. If the tank seal is broken, it is recommended that a leak test be performed to verify that the tank is properly sealed.
  • Page 25 Weld-on tank cover removal Weld-on tank cover installation Grind smooth and then clean cover, removing all weld WARNING spatter accumulated during cover removal. Explosive gas. Can cause severe injury, death, or It is recommended that the tank weld rope gasket damage to equipment.

  • Page 26: Bushing Removal And Replacement

    Bushing removal and replacement Table 1. Bushing Hardware Tightening Torque Verify that tank is grounded. De-energize transformer Bushing Clamps from a remote upstream source. Ground all bushings Clamp Type Hardware Tightening Torque and terminals before performing maintenance on bushings. Cast Aluminum Clamp 70-80 in-lbs.

  • Page 27: Insulating Liquid Maintenance

    The following R-Tran™ transformers steps should be followed when purging and recharging Eaton’s Cooper Power series R-Tran™ transformers are Envirotran transformers: filled with R-Temp fluid. R-Temp fluid is a non-toxic, readily Verify that tank is grounded. De-energize transformer biodegradable, less-flammable (high fire point), high from a remote upstream source.

  • Page 28: Operation

    26 kV or better. Operation Filtering insulating liquid Eaton designs its transformers to operate at rated load with a temperature rise equal to or less than the temperature Conventional transformer oil, R-Temp, or Envirotemp™...

  • Page 29: Applicable Standards

    We suggest that one spare set of gaskets for manhole/ handhole and any gasket-type bushings be kept on hand. Other renewal parts may be ordered through your Eaton representative. When ordering parts, describe to your Eaton representative the maintenance being performed or the problem experienced.

  • Page 30: Preventative Maintenance Instructions

    Preventative maintenance instructions If any issues are found regarding the below, contact PS-WarrantyServices@ Eaton.com for assistance on transformers under warranty. Additionally, these reports must be available upon request to maintain warranty period. WARNING Hazardous voltage. Can cause severe injury, death, or damage to equipment.
  • Page 31 Items to Inspect Points to be checked Remedial Action Frequency Dielectric Fluid Level Check dielectric fluid level gauge. Note that the If the dielectric fluid level is below the nominal Annual fluid level gauge has a notation as to the expected level, check transformer for signs of a leak.
  • Page 32 Waukesha, WI 53188 United States Eaton.com/cooperpowerseries © 2015 Eaton All Rights Reserved Eaton is a registered trademark. For Eaton's Cooper Power series three- Printed in USA phase pad-mounted transformer product Publication No. MN202001EN information call 1-877-277-4636 or visit: All trademarks are property www.eaton.com/cooperpowerseries.

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