doc

Treatment of malfunction of differential protection of main transformer

  • 2013-09-19
  • 22KB
  • Points it Requires : 2

The relevant inspections and tests on the differential protection are as follows: 1. Check that the BCH-2 differential relay is consistent with the set value list, and check and test the differential relay to make sure it is qualified. 2. Check that the wiring of the differential protection secondary circuit is correct, and that the insulation of the secondary circuit meets the requirements of the regulations. 3. The 35kV switch is of type DW2-35. Check that the current transformer in the oil tank is of the LRD type dedicated to differential protection, with a transformation ratio of 75/5. Check that the transformation ratio and polarity are correct; the 6kV current transformer is LAJ-10 300/5, and the differential is connected to the D-level winding. Check that the transformation ratio and polarity are correct. 4. The differential protection is driven according to the set value list, and each relay operates correctly. The above items are normal, indicating that there are no defects in the primary and secondary equipment and no errors in the secondary wiring. Then the main transformer is restored to power, and the differential protection vector and differential pressure detection are normal after power is supplied.

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