Verifying unit for switchgear insulated detector

Abstract

The invention relates to a verifying unit for a medium-voltage switchgear insulated detector. The verifying unit for the medium-voltage switchgear insulated detector is composed of an electromagnetic wave signal generator, an insulated supporting member, a metal outer shell provided with a gap and an insulating spacer, wherein the electromagnetic wave signal generator is fixed inside the metal outer shell provided with the gap through the insulation supporting member, and the insulating spacer is fixed in the gap of the metal outer shell provided with the gap. The verifying unit for the medium-voltage switchgear insulated detector fills the blank of verifying unit of the insulated detector, and provides a verifying device for the insulated detector based on the transient-state ground voltage. Based on the detection theory of the transient-state ground voltage, the verifying unit for the medium-voltage switchgear insulated detector simulates generated electric-discharge signals, simulates the transmission and leakage paths of electromagnetic waves in a switch cabinet, and achieves verification of the transient-state ground voltage detector. The verifying unit for the switchgear medium-voltage insulated detector has the advantages of being ingenious in design, reasonable in structure, and quite suitable for verification and popularization of insulated detectors of medium-voltage switchgears in an electric power system.

Description

technical field [0001] The invention belongs to the field of calibration of electric equipment testing instruments, and in particular relates to a calibration device for insulation testing instruments of medium-voltage switchgear. Background technique [0002] When there are insulation defects inside the medium voltage switchgear, partial discharge will be generated, and the detection of partial discharge can effectively judge the insulation state of the medium voltage switchgear. At present, among the detection methods of partial discharge signals inside medium-voltage switchgear, the transient ground voltage method is widely used, and it is a more practical and feasible method. [0003] When partial discharge occurs inside the switchgear, electromagnetic waves are transmitted to both ends of the discharge. Because of the skin effect, the transmitted voltage inside the metal cannot be detected directly from the outside. However, at an opening in the metal case, electromag...

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Problems solved by technology

[0005] However, the transient ground voltage detection method is an unconventional partial discharge detection method, and there are no direct IEC standards and national standards that can be applied. Therefore, there is no available calibration device for the transient voltage detector

For the operation and maintenance personnel of the power grid company, if a detector is used for a long time, whether the performance of the instrument itself will change and whether the displayed data is accurate will directly affect the efficiency of maintenance work and the safety of the power equipment itself

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