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Test and adjustment of low voltage distribution cabinet

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The operation and maintenance work area shall plan and prevent in advance in combination with the actual situation, and formulate the special work plan for high temperature prevention of "peak summer". Based on the guiding ideology of "safety first, prevention first", focusing on preventing full shutdown of substation caused by factors such as high temperature and heavy load, and preventing equipment damage accidents caused by lightning, overheating and overload of main equipment such as transformer and GIS transformer, the high temperature prevention work shall be carried out in a planned, focused and targeted manner according to the principle of combination of investigation and treatment.

 

Test and adjustment of low voltage distribution cabinet

 

1. The high voltage test shall be conducted by a test unit approved by the local power supply department. The test standard shall comply with the national specifications, the regulations of the local power supply department and the requirements of product technical data.

 

2. Test contents: high voltage cabinet frame, bus, lightning arrester, high voltage porcelain bottle, voltage transformer, current transformer, various switches, etc.

 

3. Adjustment contents: overcurrent relay adjustment, time relay, signal relay adjustment and mechanical interlocking adjustment.

 

4. For secondary control small wire adjustment and simulation test, tighten all wiring terminal screws again.

 

5. Insulation test: use 500V insulation resistance test instrument to test the resistance of each circuit at the terminal board, and the resistance must be greater than 0.5m Ω.

 

6. If there are transistors, integrated circuits and electronic components in the secondary small line circuit, use a multimeter to test whether the circuit is connected.

 

  1. Connect the temporary control power supply and operation power supply; Remove the phase line at the upper end of the control and operation power circuit fuse in the cabinet (panel) and connect the temporary power supply.
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