Non-contact type cable voltage measuring sensor

Abstract

The invention provides a non-contact type cable voltage measuring sensor, comprising: a housing, an insulating member, a detecting electrode, an electric field measuring module, a signal demodulationand communication circuit and an aviation socket, wherein the insulating member is fixed at a groove in the housing; the detecting electrode is fixed on the upper surface of the insulating member, istightly connected with the insulating member, and is used for generating induced charge; the electric field measuring module is fixed inside the housing, is electrically connected with the detecting electrode through an electrode lead, and is used for measuring the electric field strength; the signal demodulation and communication circuit is fixed inside the housing, is electrically connected withthe electric field measuring module through a wire, and is used for analyzing and calculating electric field signals and converting the same into voltage signals; the aviation socket is mounted on the side wall of the housing, is electrically connected with the signal demodulation and communication circuit through wire, and is used for providing a power supply for the electric field measuring module and the signal demodulation and communication circuit and providing an interface for signal output.

Description

Technical field [0001] The invention relates to the technical field of sensors, in particular to a non-contact cable voltage measurement sensor. Background technique [0002] At present, the sensor used for cable voltage measurement in the power system is a voltage transformer. Its main function is to transform the high voltage (primary side) of the cable into a low voltage suitable for the work of relay protection devices and measuring instruments. The high-voltage side is electrically isolated from the low-voltage side. Voltage transformers used in power systems mainly include electromagnetic voltage transformers (Potential Transformer, PT) and capacitive voltage transformers (Capacitive Voltage Transformer, CVT). The electromagnetic voltage transformer is restricted by its working principle, and in some performance aspects, it can no longer meet the requirements of the current smart grid with large capacity and high voltage level. Its problems include: the high voltage side m...

AI Technical Summary

Problems solved by technology

Restricted by its working principle, the electromagnetic voltage transformer can no longer meet the requirements of large capacity and high voltage level of the current smart grid in some aspects of performance. The existing problems include: the high voltage side must have a high dielectric strength, so that the insulation structure More complex, bulky, and costly; there are problems such as small dynamic range, ferromagnetic resonance, and core saturation

Capacitive voltage transformers have poor transient response due to internal energy storage components such as coupling capacitors, intermediate transformers, and compensation reactors, and under high-frequency overvoltages, high-frequency vibrations caused by ferromagnetic resonance are prone to occur on the low-voltage side. oscillation, which threatens the safe operation of the equipment

Images