A capacitive voltage transformer damper detection method and system

Abstract

The invention relates to the technical field of power equipment fault testing, and discloses a capacitive voltage transformer damper detection method and system. The present invention inputs power frequency voltages with different voltage values ​​at different frequencies to the damper under test of the capacitive voltage transformer, and measures the damping current of each detection point, obtains the volt-ampere characteristic curves at different frequencies, and extracts preset faults from them. The measured value of damping current at the point is compared with the reference current threshold corresponding to the fault type, so as to realize the fault judgment of the damper to be tested; when there is no fault in the damper to be tested, it is judged whether the damper to be tested belongs to the fast saturation damping type If not, calculate the impedance difference between different frequencies according to the volt-ampere characteristic curve, and judge whether the damper to be tested is a resistive damper or a resonant damper according to the impedance difference. The invention basically realizes the automatic and accurate analysis of the fault and type of the damper, and can quickly judge the performance of the damper.

Description

technical field [0001] The invention relates to the technical field of fault testing of power equipment, in particular to a method and system for detecting a capacitive voltage transformer damper. Background technique [0002] At present, capacitive voltage transformers are widely used to monitor the line or bus voltage between substations. In order to avoid the resonance of the capacitive voltage transformer and protect it from damage when the power grid intrudes in a bad state, a damper is equipped on the residual winding of the secondary side of the electromagnetic unit of the capacitive voltage transformer. Commonly used dampers include resistance dampers, resonance dampers and fast saturation dampers. [0003] In the existing detection technology, a single power frequency voltage is applied to the damper through a frequency conversion device, the current of the damper is measured at this time, and the measurement result is analyzed and compared with the factory data, s...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a detection method and system for a capacitive voltage transformer damper, which solves the technical problem that the existing damper detection method cannot accurately determine the type of the damper, and thus cannot quickly determine the performance of the damper

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