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Document 2.4.128, Revision 3

October, 2017

Network Transformer Instruction Manual

Operation of the three-position mag-break switch is

similar to that of the three-position non-interrupting

switch. Before attempting to operate the mag-break

switch, verify that the network protector is in the

open position.

Sequential Grounding Provisions

When specified, the three-position primary

disconnect and grounding switch can be supplied

with two additional positions to allow for sequential

grounding of the primary feeders. Typical switch

operation is described in Table 2 below; however,

other user-specified switch characteristics are

available. Markings on the switch handle indicate

switch position. The switch may be operated in either

a clockwise or counterclockwise direction.

Table 2: Sequential Grounding Switch Operation

Switch

Position

Primary Feeder Connections

A Phase

B Phase

C Phase

Grounded

Open

Grounded

Open

GROUND

Grounded

OPEN

Open

CLOSED

Closed

Phase Sequence Identification Provisions

Optional phase sequence identification provisions

(also known as “phasing tubes”) are provided

when specified to allow determination of the phase

sequence of incoming primary feeders. Phasing

tubes are located on the switch chamber cover and

are positioned to allow phasing probes to be inserted

and make electrical contact with live portions of the

switch bushings. Pipe plugs or caps are provided to

seal phasing tubes when not in use.

Network Protector

Howard network transformers are usually supplied

with network protector mounting provisions designed

according to user specifications. These provisions

typically consist of a secondary throat with mounting

holes, guide pins and gasket. A steel shipping guard

is installed over the secondary throat to protect the

secondary bushings, connectors and throat flange

from damage during shipment and storage.

The network protector should be installed, operated

and maintained by the user according to the

instructions provided by the network protector

manufacturer.

Other Switching and Protective Devices

Contact the Howard Industries Transformer Division

for information related to any other switching

or protection options not discussed in these

instructions.

WARNING

FAILURE TO FOLLOW THE INSTRUCTIONS

BELOW COULD RESULT IN DEATH OR SERIOUS

PERSONAL INJURY AND MAY ALSO RESULT IN

DAMAGE TO THE EQUIPMENT.
Although the electrical interlock system should

prevent unsafe operation of the primary

switch, the operator should verify that the

transformer is disconnected from the primary

feeder and that the network protector is in the

open position.

Содержание HI-110

Страница 1: ... 128 Revision 3 October 2017 1 Network Transformer Instruction Manual Howard Industries Distribution Transformer Division Instructions HI 110 Installation Operation and Maintenance of Secondary Network Transformers ...

Страница 2: ...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 appropriate first aid procedures The instructions contained herein are intended to be a general guide for the ...

Страница 3: ...Secondary Connections 10 Primary Connections 10 Secondary Connections 10 SECTION 4 INSPECTION AND TESTING 11 Pre Energization Inspection and Tests 11 Continuity and Winding Resistance Test 11 Ratio Test 11 Insulation Resistance Test 11 Tap Changer Setting 12 Series Multiple and Delta Wye Switch Settings 12 Grounding 12 Bolted Connections 12 Fluid Levels 12 Fluid Temperature 12 Current Transformers...

Страница 4: ... 19 Automatic Pressure Relief Valve and Pressure Relief Device 19 Primary Entrance 19 High Voltage Bushings 19 Secondary Bushings 20 Current Transformers 20 Other Accessory Devices 20 SECTION 7 MAINTENANCE 21 Periodic Inspection 21 Inspection and Maintenance Checklist 21 Electrical Testing 22 Exterior Paint Finish 23 Fluid Leaks 23 Audible Sound Level 23 Other Accessory Devices 24 Sampling and Tes...

Страница 5: ...re designed in accordance with IEEE Standard C57 12 40 Secondary Network Transformers Subway and Vault Types Liquid Immersed Requirements 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 encounteri...

Страница 6: ... when the ambient temperature is below minus 20 C minus 4 F otherwise permanent damage to the transformer may result Initial Inspection Although all transformers components and accessories are carefully inspected and tested prior to shipment from the factory a thorough receiving inspection should be conducted to detect any damage or loss that might have occurred after shipment The receiving inspec...

Страница 7: ...l gauge pointer should be between the High and Low mark and point approximately at the 25 C mark A transformer found to have a low fluid level should be checked for potential leaks repaired as necessary and filled to the proper level with the same type of liquid as specified on the transformer nameplate If fluid must be added refer to Filling with Fluid for instructions Internal Inspection An inte...

Страница 8: ...ized with dry nitrogen to a pressure of 2 3 PSIG This will prevent a negative internal pressure that might draw moisture into the main tank switch chamber or terminal chamber Prior to storage be sure that the primary bushings or bushing wells are fitted with their protective dust covers and the secondary throat shipping guard is installed The transformer should be inspected periodically while it i...

Страница 9: ... designed for jacking Do not use radiator fins bushings valves gauges or sheet metal surfaces for jacking Jacking must be done using the proper jacking provisions from two adjacent corners simultaneously to prevent warping of the tank bottom Do not allow the jack to come into contact with panel radiators Refer to the transformer outline drawing for the total weight of the assembled transformer Loc...

Страница 10: ...tely to prevent overheating and possible subsequent failure of the connection Refer to Table 5 for torque recommendations Connections should be made with care to avoid placing undue stress on the bushings Primary Connections Network transformers are supplied with a high voltage entrance as specified by the user usually consisting of dead front bushings or wiping sleeves for connection to the high ...

Страница 11: ...l to remove any moisture or contaminants that could influence the test results Insulation resistance should measure at least 1 0 GΩ An insulation resistance 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 FAILURE TO FOLLOW THE...

Страница 12: ...r main tank and primary switch chamber are shipped from the factory with insulating fluid filled to the proper level indicated by the 25 C mark on the fluid level gauge Before energizing the transformer verify proper fluid levels by observing the gauges Be aware that fluid levels vary with fluid temperature A transformer found to have a low fluid level should be checked for potential leaks repaire...

Страница 13: ...rity load conditions and acoustic conditions at the installation site Refer to NEMA Standards Publication TR 1 Transformers Regulators and Reactors and IEEE Standard C57 12 90 IEEE Standard Test Code for Liquid Immersed Distribution Power and Regulating Transformers for more information about design sound levels and factory sound testing Unusual sounds should be investigated as this might indicate...

Страница 14: ...f a fault condition is suspected Do not operate a no load tap changer series multiple switch or delta wye switch while a transformer is energized 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 Checking voltages verifies that loadbreak equ...

Страница 15: ...l the tap changer is firmly locked into a tap position The wrench is keyed so that it can be removed only when the tap changer is properly placed into one of the tap positions Unless otherwise specified transformers supplied with tap changers will be shipped from the factory with the switch set to the nominal position Series Multiple or Delta Wye Switch Transformers designed with series multiple w...

Страница 16: ... verify that the transformer is not energized from either the high voltage or low voltage side Use the following procedure to move the switch from the OPEN to the CLOSED position 1 Operate the blocking toggle pin 2 Pull the mechanical locking pin on the handle 3 Rotate the handle until the mechanical locking pin engages in the CLOSED position Use the following procedure to move the switch from the...

Страница 17: ...primary feeders Phasing tubes are located on the switch chamber cover and are positioned to allow phasing probes to be inserted and make electrical contact with live portions of the switch bushings Pipe plugs or caps are provided to seal phasing tubes when not in use Network Protector Howard network transformers are usually supplied with network protector mounting provisions designed according to ...

Страница 18: ...rgized Fluid Temperature Gauge The fluid temperature gauge is a dial type bi metal device that indicates the fluid temperature at the top of the fluid column in the main tank The temperature gauge is mounted above the primary terminal chamber in a dry leak proof well permitting removal of the gauge without exposure to the tank fluid The gauge is furnished with a red drag hand pointer that indicate...

Страница 19: ...ts Primary Entrance The primary entrance is located on the top of the terminal chamber and is provided for connection to the primary feeders The primary entrance typically consists of separable insulated connectors wiping sleeves or potheads as specified by the user When separable insulated connectors are provided they may consist of universal bushing wells only universal busing wells with factory...

Страница 20: ...lating fluid CT leads are brought out to an external junction box mounted on the main tank Transformers are shipped from the factory with CT leads shorted together and grounded If the CT s are not connected to a metering load by the user they must remain shorted and grounded to avoid hazardous voltage at the CT secondary terminations WARNING FAILURE TO FOLLOW THE INSTRUCTIONS BELOW COULD RESULT IN...

Страница 21: ...hering that exposes the primer coat or bare metal Repair any paint damage that might be found Refer to Exterior Paint Finish for instructions 3 Inspect thoroughly for evidence of fluid leaks including main tank switch chamber terminal chamber radiators bushings gauges switches valves and all other accessories Check fluid level gauges or sight glasses to determine fluid levels in all compartments I...

Страница 22: ...es Transformer Division for testing recommendations 13 Lubricate external parts of the primary disconnect and grounding switch at least annually 14 Exercise the primary disconnect and grounding switch at least annually Electrical Testing The following electrical tests should be used to determine the condition of the transformer Follow the instructions and precautions provided by the test equipment...

Страница 23: ...stigate thoroughly to determine if an actual leak does exist on the transformer False indications of a leak can occur as a result of residual fluid that was not sufficiently cleaned during the oil filling process In some cases silicone lubricant used to install high voltage bushing inserts can spread to the tank surface giving a false indication of a fluid leak To verify that a fluid leak exists c...

Страница 24: ...s outlined in the Opening the Transformer Tank section 3 Use a clean dry temporary storage container to contain the fluid 4 Use clean pumps and hoses that have not been contaminated by different types of fluids Hoses must be designed for handling the particular fluid in the transformer As an example rubber hoses should not be used with mineral oil 5 Connect the pump intake line to the drain valve ...

Страница 25: ... 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 dropping into the core coil assembly The following procedure should be used to remove the bolted hand hole cov...

Страница 26: ...lamp ring 3 8 mounting studs 60 40 80 High voltage bushing well molded with clamp ring 3 8 mounting studs 120 90 150 Notes When checking tightness 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...

Страница 27: ...ward Industries Transformer Division A description of the part and the transformer serial number will be required to ensure that the correct part has been ordered Warranty Claims The Howard Industries Transformer Division 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...

Страница 28: ...l HI 110 Instructions for Installation Operation and Maintenance of Secondary Network Transformers Document 2 4 128 Revision 3 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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