Error experiment device of zero sequence voltage mutual inductors

Abstract

The invention relates to an error experiment device of zero sequence voltage mutual inductors. The output end of a three-phase voltage regulator is connected with a primary end of a three-phase transformer, a secondary neutral point of the three-phase transformer is not grounded, a primary winding of a single-phase voltage mutual inductor is connected with three zero sequence voltage mutual inductors to be tested in the same specifications in a star shape, a secondary winding of the single-phase voltage mutual inductor is connected with a power supply voltage observation voltage meter, and when the voltage indicates the rated phase-to-phase voltage, the primary voltage of the zero sequence voltage mutual inductor is the work voltage. A secondary monitoring measuring winding is connected with a voltage measuring transfer switch, a secondary protection winding of the zero sequence voltage mutual inductor is connected with a rated phase-to-phase voltage recording voltage meter, and the polarity end of the primary winding of the zero sequence voltage mutual inductor is connected with a primary neutral point of the voltage mutual inductor and is secondarily grounded together with a simulation single bus grounding failure device. The error experiment device has the beneficial effects that the monitoring of the practical work voltage of the zero sequence voltage mutual inductor is carried out by the voltage meter connected between the phases, and the primary work voltage of the zero sequence voltage mutual inductor can be precisely caught.

Description

[0001] technical field [0002] The invention relates to an error test device for a zero-sequence voltage transformer, belonging to the field of transformer tests. Background technique [0003] The zero-sequence voltage transformer is connected between the primary neutral point of the voltage transformer and the ground, which is very effective in preventing parallel ferromagnetic resonance. The technical conditions stipulate that the transformation ratio error is not more than 5%, and the primary voltage is 6(10, 35) / √ 3kV, secondary voltage 100V, 100 / √3V, carry out the transformation ratio error test and judge whether it is qualified or not based on this data. In fact, this test method is not carried out in the working state. When the zero-sequence voltage transformer is working, due to the imbalance of the three-phase load, the primary neutral point is shifted. In this state, the primary voltage is higher than that given above. The value is much smaller, resulting in a la...

AI Technical Summary

Problems solved by technology

In fact, this test method is not carried out in the working state. When the zero-sequence voltage transformer is working, due to the imbalance of the three-phase load, the primary neutral point is shifted. In this state, the primary voltage is higher than that given above. The value is much smaller, resulting in a large error

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