Siemens 21-115532-001 manual Periodic Inspection

Page 16

MAINTENANCE

Page 12

 

 

 

When inspecting, check to be certain all hardware and con-

PERIODIC INSPECTION

nections are tight. The principal point of the internal inspection will

 

 

 

be the condition of the arcing contacts on the tapchanger. Since

A sample of oil from the regulator should be subjected to

numerous factors influence the rate of contact tip wear, no one

criteria can be stated to recommend when a contact should be

dielectric breakdown test, per ASTM D-877. If found below

changed.

25kV, the oil should be changed or reconditioned. Refer to

 

ANSI C57.106-2002. Other tests, especially Neutralization

The following figure shows the possible condition of contact wear

Number, Interfacial Tension and Power Factor are also useful

after a period of operation. If the contact surface is less than 1/8

and may be preferred by particular users.

inch wide, the contact should be replaced. (See the Figure below)

 

 

 

The oxidation inhibitor in the oil will be depleted over a period

Contacts, both movable and stationary, show normal burning and wear

of a few years and should be replaced. The inhibitor is 2, 6-

ditertiary-butyl-para-cresol (DBPC) at a concentration level of

once placed in service. If for any reason A1 dimensions exceed 4/5 of

0.2 to 0.3%.

A, the stationary contact should be replaced. (See the Figure below)

The time interval between internal inspections will depend upon frequency of tapchanger operation and the load on the regulator. Regulators subjected to numerous overloads and a high load factor may require more frequent inspections than those carrying normal loads. While internal inspection is not a necessity, preventive maintenance inspections will help assure the continuity of service.

To untank a JFR regulator, proceed as folllows:

1.Remove the regulator from service as described on Page10.

Hazardous voltages. Will cause serious injury, death, or equipment damage.

To prevent:

Always de-energize and ground the equipment before maintenance requiring access to high voltage parts.

A

A1

UPPER FILTER PRESS SEALING

If cover top cap is removed, make certain the cap is properly sealed when replaced on cover. Siemens recommends applying pipe sealant (Loctite PST or equivalent) around the threads of the adapter. Furthermore, it is recommended that the seal be tested by applying 5 psig pressure through the pressure relief valve fitting for 5 minutes, with no loss in pressure. Failure to assure seal may allow moisture to be pulled into the unit during a cool-down cycle.

2.Place the regulator in a position where energized overhead lines will not interfere.

3.Operate pressure relief valve to vent regulator before un- tanking

4.Remove the mounting bolts holding the control box onto the main tank.

5.Remove all cover bolts.

6.The regulator can now be pulled from the main tank by the cover lifting eyes.

FAN MAINTENANCE

Cooling fans (if equipped), require minimum attention. Fans with plain sleeve bearings or Oil-Litesleeve bearings should be oiled at least once a year with SAE 10-W engine oil which does not thicken in cold weather. Oil must be added to sleeve bearings before starting motor for the first time after installation.

Fans equipped with ball bearing motors are packed with grease before shipment and should be greased at least once a year with a soda-soap, ball-bearing grease of medium consistency furnished by a reliable supplier.

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Contents Instructions Page Table of Contents Page Introduction Qualified PersonIntroduction Physical Considerations Installation Diagrams Closed DeltaProtective Measures Control ConnectionsConnection Diagrams Inverted Design Ansi Type B Connection Diagrams Placing the Regulator in Service Removing the Regulator from Service Maintenance General Instructions Operational ChecksPeriodic Inspection Special Features Operation AT Less than Rated Voltage VARI-AMPTMRANGE and Current Ratings AvailableForced AIR Cooling Subbase Assembly Parts List Major Components Parts ListType TLG Dial Switch Type TLG Quick Break Mechanism Type TLF Dial Switch Type TLF Quick Break Mechanism Bypass Arresters Bushings Bushings 5400WPR4018-06 PR4018-05 PR4018-04 October

21-115532-001 specifications

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