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MAINTENANCE PRACTICE OF ALL TYPES OF ISOLATORS, EARTH SWITCHES AND WAVE TRAPS MANISH TIWARI MANAGER, BINA

ISOLATOR---PURPOSE. Used in no load conditionsMainly used for Isolation of important equipment like Transformers, Reactors, CBs etc.It does not have making or breaking capacityRatings are in continuous operating current and Voltage levelIt is used in addition to CBs. TYPE OF ISOLATORS BASED ON

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MAINTENANCE PRACTICE OF ALL TYPES OF ISOLATORS, EARTH SWITCHES AND WAVE TRAPS MANISH TIWARI MANAGER, BINA

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    1. MAINTENANCE PRACTICE OF ALL TYPES OF ISOLATORS, EARTH SWITCHES AND WAVE TRAPS MANISH TIWARI MANAGER, BINA

    2. ISOLATOR---PURPOSE Used in no load conditions Mainly used for Isolation of important equipment like Transformers, Reactors, CBs etc. It does not have making or breaking capacity Ratings are in continuous operating current and Voltage level It is used in addition to CBs

    3. TYPE OF ISOLATORS BASED ON OPERATING MECHANISM HCB Isolators Vertical Break Type Double Break Isolators Pantograph Isolators Tandem Isolator

    4. TYPE OF ISOLATORS BASED ON LOCATION OF USE Line Isolator Bus Isolator Reactor Isolator Transformer Isolator

    5. TYPE OF ISOLATORS BASED ON E/S Without Earthswitch (Used where earthing is not required) With one Earthswitch (Commonly used for earthing the equipment for which Isolator has been provided) With two earth switch (Generally used for Bus earthing)

    6. ISOLATOR OPERATION Independent operation of each pole Gang operated Motor operated Hand operated

    7. HCB ISOLATORS

    8. HCB ISOLATORS—MAIN CONTACTS

    9. DOUBLE BREAK ISOLATORS

    10. DB ISOLATOR---CENTRAL ROTATING STACK

    11. DB ISOLATOR--CONTACTS

    12. DB ISOLATOR--CONTACTS

    13. PANTOGRAPH ISOLATOR

    14. PANTOGRAPH ISOLATOR--CONTACTS

    15. EARTH SWITCH—FIXED CONTACT

    16. EARTH SWITCH—MOVING BLADE

    17. MOM BOX

    18. DOWNROD OVER MOM BOX

    19. ISOLATOR INTERLOCKS If Isolator is closed, E/S should not close If E/S is closed Isolator should not close If CB is closed then Isolator should not operate If Bus E/S is connected none of Bus Isolators should operate If selected on local, remote operation should not take place If bay (Main / Tie) is connected Line Isolators should not operate If Line Isolator is connected Line Reactor Isolator should not operate

    20. ISOLATOR MAINTENANCE SCHEDULE

    21. EARTH SWITCH MAINTENANCE SCHEDULE

    22. CONTACT RESISTANCE MEASUREMENT The measurement is taken at Isolator in closed position. The Ohm Meter operates on the four wire measurement principle. To measure the contact resistance connect the respective leads and adjust the veri A.C. so that app. 100 amps current flow through the contacts. Value of contact resistance is directly displayed on the digital LED display screen. By using four terminal method, we can nullify the resistance of test leads if input impedance of measuring device (IC) is very high.

    23. CONTACT RESISTANCE MEASUREMENT Contact resistance of the main contacts indicates wear out and misalignment of the main contacts. If the value of contact resistance exceeds the permissible limit i.e. 300 microohms ( Ref. DOC. NO: D-5-02-XX-01-02), this could result in overheating of the contacts. Therefore, the problem of high contact resistance should be attended immediately by making proper alignment of contacts or by replacing finger contacts.

    24. MAINTENANCE OF MOM BOXES Gear operation is to be checked Fuses checks Pole discrepancy relay operation if provided in DB Isolators Space Heater Illumination Castle Lock

    25. ISOLATOR MAINTENANCE Acceptable limits for various tests performed on Isolators are

    26. ISOLATOR AND E/S MAINTENANCE FORMAT YEARLY

    27. ISOLATOR AND E/S MAINTENANCE FORMAT 4 YEARLY

    28. LINE TRAP

    29. LINE TRAP Installed on lines where PLCC is used Installed immediately after CVT Wave trap / Line trap blocks high frequency PLCC signals entering in the switchyard For Power frequency signals it provide low impedance path Normal ratings 0.5 mH , 1.0 mH etc. 2000A, 3150A etc.

    30. MAINTENANCE SCHEDULE

    31. MAINTENACE FORMAT

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