Embedded partial discharge online monitoring intelligent instrument based on pulse current method

Abstract

The invention discloses an embedded partial discharge online monitoring intelligent instrument based on a pulse current method. A power circuit is used for power supply, and the intelligent instrument is connected to primary system power distribution equipment through a radio frequency signal line. The intelligent instrument comprises an impedance matching circuit for receiving a 100Hz-5MHz current signal collected by the radio frequency signal line, a signal conditioning circuit and a CPU circuit. A signal input end of the signal conditioning circuit is connected with the impedance matching circuit, and the CPU circuit is connected with a signal output end of the signal conditioning circuit. According to the invention, the state detection technology has the opportunity to give play to effects in improving the power supply reliability, optimizing a detection strategy, reducing the operation and maintenance cost, and prolonging the potential service life of the equipment.

Description

technical field [0001] The invention relates to the field of partial discharge detection and on-line partial discharge monitoring of power distribution equipment, in particular to an embedded partial discharge on-line monitoring intelligent instrument based on a pulse current method. Background technique [0002] Most of the faults in the distribution network are accompanied by a common phenomenon: partial discharge. Scientific partial discharge detection technology and effective detection means are of great significance for timely detection of abnormal equipment operation, improvement of power supply reliability of distribution network system and economical and safe operation of power system. [0003] Partial discharge detection methods are classified according to the means of realization or the basic principles on which the detection is based, and can be divided into direct methods and indirect methods. The theoretical basis of the direct method is the circuit theory, and...

AI Technical Summary

Problems solved by technology

Defects and intermittent discharge accidents that occur in the middle of the inspection cycle cannot be detected in time

As a result, insulation defects that occur sometime between two inspection campaigns tend to go unnoticed

[0007] 3. Due to the limitation of the detection signal frequency range of the existing detection equipment, there is a "blind area" in the state inspection activities

Partial discharge associated signals generated inside the cabinet, such as electromagnetic radiation signals, sound signals, etc., are difficult to transmit due to the shielding effect of the metal cabinet during the outward transmission process. Even if they are transmitted, they will be greatly weakened. It is difficult for the existing detection equipment to accurately capture the signal when detecting the signal outside the cabinet, resulting in unsatisfactory detection effect

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