TRANSFORMER MAINTENANCE PROCEDURE FOR 3300/440V.
High Tension Cable Barrier - Vacuum Circuit Breaker | Low Tension Cable Barrier -Air Circuit BreakersFollow The Below Step & Procedure For Compete Maintenance & Testing Of HTCB & LTCB (TOSHIBA MAKE).
1. Get A Work Permit With The Appropriate Tag Number From Operations For The Necessary Transformer.
2. Verify That All Parameters Are Closed On Both The LV And HV Sides. Verify That Both Transformers Are Operational.
3. Create A Work Permit Or Caution Notice And Post It On LV And HV Panels.
4. Turn Off The LV Side ACB And The HV Side ACB Of The Current Tag Number In That Order. Verify That There Isn't A Power Outage.
5. Slide The HT Breaker Panel Open. Pull The Breaker Outward From The Service Position To The Test Position By Lifting The Latch Pins On Both Handles Upward.
6. Turn Off The Control Supply And Take Out The Front Of The "CB" And The Control Connectors. Take Off The Stopper Plate And Pull The VCB Outside The Breaker Box.
7. The LV (ACB) Breaker Panel Is Open.
8. Raise The Flapper (Right-hand Side Of Middle Breaker) And Slide The Rack Out/in Handle Into The Slot.
9. Turn The Handle In An Anticlockwise Direction Until It Reaches The Disconnected Position. After Lifting The Stopper Levers On The ACB's Two Sides, Pull The ACB Outward.
10. Place The Trolley Carrier Inside, Either On Both Sides Of The ACB Or Beneath The Lifting Pins. Raise The Trolley So That It Carries The Breakers. Place The Breaker On The Ground And Pull The Trolley Outside.
11. Use The VCB And ACB Manual On/off Switches To Release The Charged Spring.
12. Position The Earthing Hand Lever Of The Compartment Above The VCB Cubicle On The 3.3 KV Side Earthing Switch.
13. Lift The Earthing Leaver, Slide The Stopper Plate To The Right, And Then Release It.
14. Unscrew The Castle Key From The ACB, Place It In The Earthing Breaker, And Turn It To Release The Clutch.
15. If The Rack-in Handle Reaches The Service Position, Insert It Into The Slot On The Right Side And Spin It Clockwise.
16. Take Off The Handle And Turn On The Earthing Switch's Control Supply.
17. Shut The Panel Door And Activate The Earthing Switch. Take Note Of The Earthing Indicator. Put Barrier Caution Tape With The Appropriate Identification Number On Both Sides Of The Transformer.
18. Wipe Out The Entire Transformer. LV And HV Side Terminal Boxes Should Be Open. Examine And Tighten The Hi-speed Bushings On Terminations.
19. Check And Tighten All Connections To The Soil.
20. Check The Primary And Secondary Windings' Insulation Resistance Both Between The Windings And With Earth. Go With A 2.5kv Megger For HT Winding. To Wind LV, Use A 500v Megger. When Megger, Remove The Neutral Link On The Lt Side.
21. Shut Down The Terminal Units. Verify The Pressure Of Inert Gas. For Testing, Take Some Transformer Oil.
22. Examine, Clean, And Check The ACB And VCB For Abnormalities And Looseness. Put Petroleum Jelly On Your Fingers. Megger Terminal Insulation Resistance Values. Calculate The Poles' Contact Resistance.
23. Examine The VCB And ACB Manual Operations.
24. Place The VCB In The Test Position Within The Breaker Compartment. Adjust The Stopper Flap Back Into Place.
Check To See That The Breakers Are Off, Insert The Control Pin Plugs, And Turn On The Control Supply.
25. Rack Out The LV Side Earthing Breaker To The Unconnected Position. Remove The Key To The Castle.
26. Use The Trolley And Rack To Insert The ACB, Moving The Rack Handle Clockwise To Place It In The Service Position.
27. Use Safety Equipment To Conduct A Functional Test.
28. Move Both Breakers Into The Service Mode. Turn On The HT Breaker. Check The Voltage.
Shut Off The Lt Breaker. Check The Current And Voltage On The HT And Lt Sides.
30. Take Off The Caution Tags And Revoke The License.
31. Record Rack-in And Rack-out Information In The Substation Log Book.
32. Record All Readings And Values In History Cards.
33. Send Oil Samples For Testing Acidity And Dielectric Strength.
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