Online capacitor monitoring system based on partial discharge monitoring

Abstract

The invention disclose an online capacitor monitoring system based on a partial discharge monitoring, and the system provided by the invention comprises a plurality of sensors, amplifiers and signal processing units, an AD (Analog-to-Digital) conversion unit, and a control process and display unit. A series of operations comprising amplification, filter, following, AD conversion, data analysis, data process and storage are carried out on sensing signals so that an automatic alarm is turned on when the fault of a capacitor is detected; and meanwhile, all operation data is sent to a remote monitoring computer. Based on the partial discharge monitoring, the invention provides a combined acoustic-electric detection system based on the partial discharge by combining the advantages of two detection methods, namely a partial discharge electric detection method and an acoustic detection method; the combined acoustic-electric detection system can be used for continuously monitoring the operation condition of the capacitor and diagnosing abnormalities in an early stage, so that the safety and reliability of electricity supply of an electric power system are guaranteed.

Description

technical field [0001] This patent relates to the technical field of on-line monitoring of power equipment, in particular to an on-line monitoring system for on-line monitoring of capacitors in substations with a voltage level below 35kV. Background technique [0002] In the modern power industry, in order to reduce line loss, improve power factor and stabilize line terminal voltage, urban and rural power grids and substations of industrial enterprises with large power consumption are equipped with a large number of compensation capacitors. The installed capacity of shunt capacitors in the system can reach about half of the total installed capacity. Therefore, the safe operation of shunt capacitors plays a vital role in the stable and normal power supply of the entire power system. [0003] Relevant statistics show that about 70% of the faults in the operation of power equipment are caused by insulation faults. To ensure safe operation, the equipment must be overhauled. Fo...

AI Technical Summary

Problems solved by technology

The acoustic measurement method has unique advantages in the location of the discharge source of complex equipment, and is not sensitive to electromagnetic interference. However, the acoustic wave is attenuated and distorted seriously in the propagation path, and the acoustic measurement method basically cannot reflect the discharge volume, which makes it generally not independent in practice. Combine acoustic and electrical measurements using acoustic measurements

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