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Document 2.4.126, Revision 4

October 2017

Three-Phase Padmounted Distribution Transformers

The tap changer is operated by use of a rotating

handle located inside the terminal compartment.

Never operate a de-energized tap changer while the

transformer is energized. Tap changers normally

have five or seven tap positions as indicated on

the tap changer dial plate and the transformer

nameplate. A locking mechanism is normally

provided to lock the tap changer into position and

prevent accidental operation. Do not re-energize the

transformer until the tap changer is firmly locked

into a tap position. The transformer is shipped

from the factory with the tap changer in the rated

voltage position, unless otherwise specified by the

customer.

Series/Multiple or Delta/Wye Switch

Transformers designed with series/multiple

windings (dual-voltage or triple-voltage

transformers) are supplied with a de-energized

series/multiple switch. Transformers with re-

connectable delta/wye windings are supplied with

a delta/wye switch. The presence of either of

these switches will be indicated on the transformer

nameplate.
The transformer must be completely de-energized

before operating either of these switches. If the

transformer is not de-energized before operating

the switch, personal injury and permanent

equipment damage will result. Unless otherwise

specified, series/multiple transformers are shipped

from the factory with the series/multiple switch in

the highest voltage position.

Load-Break Switch

One or more rotary under-oil load-break switches

may be supplied on the transformer and located in

the high-voltage compartment. These switches can

be either two-position (ON-OFF) switches or three-

or four-position sectionalizing switches. Switch

positions are marked on the transformer front panel

and shown on the nameplate diagram. Rotary load-

break switches are designed to be operated with a

live-line tool (hot stick or shotgun stick) and should

not be operated by hand.
The two-position switch is operated by inserting

the live-line tool into the operating handle and

rotating the switch to either the ON or OFF position.

The three- or four-position switch is operated by

inserting the live-line tool in the index plate and

moving the plate over the peg between its present

setting and the next setting. The index plate

prevents the switch from switching more than one

position at a time. The live-line tool is then inserted

into the switch operating handle and turned until

the switch snaps into the next position. Repeat this

procedure until the switch is in the desired position.

Do not stop and reverse direction of the switch

before it has changed position, as this will damage

the switch mechanism.

Fuses

A blown fuse may indicate a faulted transformer.

Do not replace a blown fuse unless the cause of the

fuse operation has been identified and corrected.

Fuses should be applied according to the fuse

rating. Replacement fuses should have the proper

rating and operating characteristics. Refer to the

circuit diagram on the transformer nameplate for

the location of fuses.

DANGER

FAILURE TO FOLLOW THE INSTRUCTIONS

BELOW WILL RESULT IN DEATH OR SERIOUS

PERSONAL INJURY, AND DAMAGE TO THE

EQUIPMENT.
• Do not operate a de-energized series/

multiple or delta/wye switch unless the

transformer is totally de-energized.

• Do not re-energize the transformer

unless the series/multiple or delta/wye

switch handle is locked into position.

CAUTION

FAILURE TO FOLLOW THE INSTRUCTIONS

BELOW MAY RESULT IN MINOR OR

MODERATE PERSONAL INJURY, AND /OR

DAMAGE TO THE EQUIPMENT.

• Do not operate a load-break switch by

hand. Operate only using a live-line tool

(hot stick or shotgun stick).

• Do not stop and reverse direction of the

load-break switch before it has changed

position.

Содержание HI-105

Страница 1: ...7 1 Three Phase Padmounted Distribution Transformers Howard Industries Distribution Transformer Division Instructions HI 105 Installation Operation and Maintenance of Three Phase Padmounted Distribution Transformers 45 kVA through 10 000 kVA ...

Страница 2: ... voltage bushing terminals have been properly grounded Only qualified personnel should install maintain and operate this equipment Qualified personnel are those who are trained in the installation maintenance and operation of high voltage equipment trained in the proper use of personal protective equipment such as rubber gloves safety glasses protective clothing hard hats etc and trained in approp...

Страница 3: ...and After Initial Energization 12 Pre Energization Inspection and Tests 12 Ratio Test 12 Insulation Resistance Test 12 Tap Changer Setting 12 Series Multiple or Delta Wye Switch Settings 13 Grounding 13 Bolted Connections 13 FluidLevel 13 Fluid Temperature 13 Internal Fault Detector 13 Current Transformers 13 Accessory Wiring 13 Tank Finish 13 Tools 13 Internal Inspection 13 Post Energization Insp...

Страница 4: ... Flip Top Terminal Compartment Cover 24 Door Handle Padlock and Security Bolt 24 Lift Off Door Hinges 24 Other Accessory Devices 24 Section 7 Maintenance 25 Periodic Inspection 25 Inspection Checklist 26 Electrical Tests 27 Exterior Paint Finish 28 Fluid Leaks 28 Audible Sound Level 28 Molded Case Circuit Breakers 29 Other Accessory Devices 29 Sampling and Testing the Fluid 29 Filtering the Fluid ...

Страница 5: ...designs Standard and optional features are subject to change without notice The instructions contained herein are applicable to transformers operated in normal conditions as specified in the Usual Service Conditions section of IEEE Standard C57 12 00 Questions regarding installation operation and maintenance particularly when encountering unusual or special circumstances not sufficiently covered b...

Страница 6: ...l Inspection Although all transformers components and accessories are carefully inspected and tested prior to shipment a thorough receiving inspection should be conducted to detect any damage or loss that might have occurred during shipment The receiving inspection should be completed upon receipt and before unloading from the truck Note any damage or discrepancies on the bill of lading file a cla...

Страница 7: ...h and Low marks For transformers supplied with a fluid sight plug the fluid level can be directly observed if it is within acceptable range If the transformer does not have a fluid level gauge or sight plug the fluid level can be checked by removing the liquid level plug located at the 25 C mark Exercise caution when checking the fluid level using the fluid level plug as the fluid may spill out an...

Страница 8: ...rea in their original shipping containers Do not store the transformer in a corrosive environment If the transformer is to be stored for an extended period of time before being placed into service it should be stored on a firm level surface The gas space above the insulating fluid should be pressurized with dry nitrogen to a pressure of 2 3 PSIG This will prevent a negative internal pressure that ...

Страница 9: ...ting Consult local and national codes to ensure that the installation meets all applicable requirements Location of the transformer must permit it to operate in conditions that meet the requirements specified in the Usual Service Conditions section of IEEE Standard C57 12 00 Operation not meeting these service condition requirements will compromise transformer capacity and reliability unless the t...

Страница 10: ...hat all mating connector surfaces are clean and smooth Connections must be tightened appropriately to prevent overheating and possible failure of the connection Refer to the nominal torque guidelines contained in Table 3 Connections should be made with care to avoid placing undue stress on the bushings High Voltage Connections Three phase padmounted transformers with live front construction are us...

Страница 11: ...October 2017 11 Three Phase Padmounted Distribution Transformers Low Voltage Connections Three phase padmounted transformers are normally supplied with externally clamped molded low voltage bushings with or without spade terminals ...

Страница 12: ...ce test must not be performed on a wye wye connected transformer with an Ho Xo bushing without first disconnecting the internal connection between the primary and secondary neutrals This connection can be found on a terminal board located below the fluid level in the transformer tank Refer to Opening the Transformer Tank for instructions 3 Tap Changer Setting Check the tap changer setting to ensur...

Страница 13: ... checked by temporarily removing the liquid level plug located at the 25 C mark 8 Fluid Temperature Observe the fluid temperature gauge and make sure the temperature is no lower than indicated below before the unit is energized 20 C 4 F for conventional transformer oil 0 C 32 F for R Temp fluid 10 C 14 F for FR3 fluid 9 Internal Fault Detector If the transformer is supplied with an Internal Fault ...

Страница 14: ...ound levels and factory sound testing Unusual sounds should be investigated as this might indicate a potential problem 6 Locking the Terminal Compartment Before leaving the installation site make sure the terminal compartment is secure using the following procedure Lower the flip top cover if supplied and engage the center mounted cover security bolt Close the primary compartment door and engage e...

Страница 15: ... DANGER FAILURE TO FOLLOW THE INSTRUCTIONS BELOW WILL RESULT IN DEATH OR SERIOUS INJURY AND DAMAGE TO THE EQUIPMENT Do not operate load break equipment if a fault condition is suspected Use a live line tool hot stick or shotgun stick to operate transformer load break equipment After operating transformer loadbreak equipment check that voltages at transformer terminals are the expected values Check...

Страница 16: ...former front panel and shown on the nameplate diagram Rotary load break switches are designed to be operated with a live line tool hot stick or shotgun stick and should not be operated by hand The two position switch is operated by inserting the live line tool into the operating handle and rotating the switch to either the ON or OFF position The three or four position switch is operated by inserti...

Страница 17: ...n fuse device is equipped with a series connected fluid immersed isolation link or if specified by the customer a series connected partial range current limiting fuse Isolation links and partial range current limiting fuses are designed to blow in the event of an internal transformer fault A transformer with a blown isolation link or partial range current limiting fuse cannot be re energized and m...

Страница 18: ... firmly into the Bay O Net housing 2 Twist the locking handle latching it to the shoulder of the Bay O Net housing Make sure that the metal washer is positioned tightly on the end of the Bay O Net housing 3 Inspect the fuse holder carefully to make sure it is fully seated and latched properly Dead Break Dry Well Canister Fuse The dead break dry well canister is a fluid tight single pole current li...

Страница 19: ...itch insert the live line tool in the operating hook and pull forward swinging the Arc Strangler open To remove the Arc Strangler insert the live line tool in the hinge opening and lift up S C Fused Switch S C fused switches should be operated according to instruction provided by S C S C tools should be used to operate an S C fused switch Vacuum Fault Interrupter The vacuum fault interrupter VFI t...

Страница 20: ... by Cooper Power Systems CPS These two styles operate differently as indicated below Before testing the transformer disconnect the arresters using the following procedure for the disconnector on each phase 1 Make sure the transformer tank is properly grounded 2 De energize the transformer from a remote location 3 Ground all bushings and terminals 4 Disconnect the MOV arresters by operating the dis...

Страница 21: ...tential or applied potential tests The following procedure should be followed to manually reconnect the arrester leads 1 Reconnect each of the three arrester leads to their junction points 2 Re install the tank cover Refer to Opening the Transformer Tank for instructions Molded Case Circuit Breakers Molded case circuit breakers use an automatic trip system to help protect the transformer and conne...

Страница 22: ...can be used to provide a remote alarm of low fluid level Transformers may also be supplied with a sight plug which provides direct observation of the fluid level Fluid Temperature Gauge The fluid temperature gauge is a dial type bi metal instrument that indicates the fluid temperature at the top of the fluid column in degrees centigrade The temperature gauge is mounted on the front panel in a dry ...

Страница 23: ...gized The IFD also includes a standard pressure relief device that is integrated into the sensor to relieve excessive tank pressures that might occur during normal operation of the transformer The IFD incorporates a removable shipping lock for transportation and storage The shipping lock must be removed after transformer installation Always transport IFD equipped transformers with the shipping loc...

Страница 24: ...or pulling cables into the terminal compartment To open the cover disengage the center security bolt and rotate the cover upward A latch is provided to secure the cover in the open position Door Handle Security Bolt and Padlock Three phase compartmental padmounted transformers are designed and constructed to be tamper resistant according to the requirements of IEEE Standards C57 12 28 or C57 12 29...

Страница 25: ...ve typically require no maintenance except replacement in the event of damage Gauges should be checked periodically to make sure they are operating properly Periodic Inspection The transformer s terminal compartment interior all exterior surfaces and the transformer s surroundings should be inspected Inspection frequency should be governed by operating conditions at the installation site More seve...

Страница 26: ...eplacing a gasket carefully clean mating surfaces to remove any rust dirt transformer fluid old gasket material or other contamination that might prevent a good seal Use appropriate gasket cement when installing new gaskets Do not reuse old gaskets Six months after replacing a gasket check and re tighten if necessary 6 Maintain a clean and unobstructed area around the transformer including suffici...

Страница 27: ...the condition of the transformer Comply with instructions and precautions provided by the test equipment manufacturer Contact the Howard Industries Transformer Division to discuss any of these tests DANGER FAILURE TO FOLLOW THE INSTRUCTIONS BELOW WILL RESULT IN DEATH OR SERIOUS PERSONAL INJURY AND EQUIPMENT DAMAGE Energize the transformer from a remote location Do not energize the transformer usin...

Страница 28: ...luid residue a low reading on the fluid level gauge and a constant zero reading on the pressure vacuum gauge which does not vary over time as a function of transformer loading and ambient temperature are also indications of a possible fluid leak To verify that a fluid leak exists clean the suspected leak area with an appropriate solvent to completely remove the fluid and observe the area for reapp...

Страница 29: ...article contaminates as well as small amounts of moisture Follow the operating instructions provided by the filter press system manufacturer Continue to filter the fluid until the dielectric test result is 26kV or greater When filtering any particular type of insulating fluid make sure the filter press system is not contaminated with any other type of fluid Contamination of the fluid may alter its...

Страница 30: ...into the tank All tools should be accounted for after work is completed It is recommended that any tools used on top of the transformer or inside the tank be attached with safety cords to prevent them from being lost inside the transformer Personnel must not stand directly on any electrical insulation Clean drop cloths should be used under working areas in the transformer to prevent objects from d...

Страница 31: ...orque values for any devices or connections not listed below Use the manufacturer s recommended torque values for any customer supplied devices Fastener Type Nominal Torque in lbs Torque Range in lbs Penta head security bolt 100 80 120 3 8 bolt 550 500 600 Hand hole cover bolt 190 170 210 Table 1 Torque Guidelines for External Cabinet Fasteners Mounting Type Nominal Torque in lbs Torque Range in l...

Страница 32: ...ess of gasketed components the measured torque will normally be less than the nominal torque listed in the table above due to relaxation of the gasket material Additional tightening of bushing mounting hardware may cause the component to crack or the gasket to become over compressed Table 4 Torque Guidelines for Accessories Component Nominal Torque in lbs Torque Range in lbs Bay O Net fuse cartrid...

Страница 33: ...vision should be notified immediately when problems are discovered during the warranty period All warranty repairs must be made or approved by the Howard Industries Transformer Division Transformer Disposal Comply with all local state and federal regulations when disposing of any insulating fluid Fluid type and volume can be determined by referring to the transformer nameplate Contact Howard Indus...

Страница 34: ...Document 2 4 126 Revision 4 October 2017 34 Three Phase Padmounted Distribution Transformers NOTES ...

Страница 35: ...Document 2 4 126 Revision 4 October 2017 35 Three Phase Padmounted Distribution Transformers NOTES ...

Страница 36: ...ions for Installation Operation and Maintenance of Three Phase Padmounted Distribution Transformers 45 kVA through 10 000 kVA Document 2 4 126 Revision 4 October 2017 Copyright 2017 Howard Industries Inc Laurel Mississippi Telephone 601 425 3151 Fax 601 649 8090 Email mkt howard com Web howardtransformers com ...

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