Wireless ultrahigh frequency sensor for local discharge detection under impulse voltage

Abstract

The invention discloses a wireless ultrahigh frequency sensor for local discharge detection under impulse voltage. The wireless ultrahigh frequency sensor comprises a signal processor, and a synchronous acquisition trigger antenna, a local discharge ultrahigh frequency detecting antenna and a wireless signal transmitting antenna which are electrically connected with the signal processor, wherein the synchronous acquisition trigger antenna receives a high frequency pulse signal which is generated when an impulse voltage generator generates an impulse voltage sphere gap action; the pulse signal triggers the local discharge ultrahigh frequency detecting antenna to receive a local discharge ultrahigh frequency signal generated in a combined electric appliance under the impulse voltage; after being digitalized by the signal processor, the local discharge ultrahigh frequency signal is wirelessly transmitted by the wireless signal transmitting antenna. According to the sensor provided by the embodiment of the invention, detection on local discharge under the impulse voltage is performed by using the ultrahigh frequency signal, so that the high anti-interference ability of the ultrahigh frequency signal can be effectively used; a wireless transmission form is adopted, so that wiring workload in a field is greatly reduced, and the field working efficiency and the detection accuracy degree are improved.

Description

technical field [0001] The invention relates to the technical field of partial discharge testing of electrical equipment, in particular to a wireless UHF sensor for partial discharge detection under impulse voltage. Background technique [0002] Closed gas insulated switchgear (Gas Insulated Switchgear, GIS) has been widely used in power grids because of its small footprint and good insulation performance. However, due to its fully enclosed structure, once an accident occurs, the consequences are much more serious than the separation of open equipment, and its fault repair is particularly complicated. [0003] Partial discharge is generally considered to be the precursor of insulation accidents, and the appearance of partial discharge often indicates that there are defects in installation, manufacture, and even design of combined electrical appliances. The continuous development of partial discharge inside the combined electrical appliance is likely to cause insulation brea...

AI Technical Summary

Problems solved by technology

At present, the detection of partial discharge under impulse voltage mostly adopts the pulse current method, and detects the partial discharge signal by connecting a high-frequency current sensor on the grounding wire. However, the pulse current method has poor anti-interference performance in field application and is often subject to a large number of Can not get accurate signal due to interference

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