Three-phase circuit overvoltage monitoring system and method thereof

Abstract

The invention discloses a three-phase circuit overvoltage monitoring system and a method thereof. The three-phase circuit overvoltage monitoring system comprises a front monitoring station, a front switch and multiple front monitoring equipment, wherein input ends of the front monitoring equipment are respectively connected with a three-phase bus in corresponding segments, output ends of all the front monitoring equipment are respectively connected with the front switch, an output end of the front switch is connected with the front monitoring station. According to the three-phase circuit overvoltage monitoring system and the method, the capacitance voltage division modules and the corresponding monitoring devices are employed to carry out voltage data acquisition, voltage withstand intensity is large, breakdown is not easy to occur, frequency response bandwidth can satisfy requirements of real transmission lightning wave frequency spectrums, original data has strong authenticity, thunder overvoltage data can be accurately acquired, and the monitoring effect is better; only when overvoltage occurs, the overvoltage value data and waveform data 50 cycles before and after the overvoltage value are stored and forwarded by the front monitoring station, so data complexity is greatly reduced.

Description

technical field [0001] The invention relates to an overvoltage monitoring system and method for a three-phase circuit. Background technique [0002] Overvoltage is the main external cause of electrical equipment insulation damage and equipment failure, especially lightning overvoltage, because its amplitude is much higher than the rated operating voltage of the power grid, it will cause the insulation level of voltage transformers, arresters, transformers and other equipment to decrease, and equipment Damage, even explosion, is particularly harmful to the longitudinal insulation of power equipment with windings such as transformers and reactors, and may cause large-scale power outages, resulting in large economic losses and social impacts. Accurate acquisition of overvoltage waveforms can be used for overvoltage At the same time, the overvoltage waveform and amplitude are also an important basis for the design of insulation coordination of substation electrical equipment, op...

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Problems solved by technology

[0004] At present, the monitoring of three-wire circuits generally uses voltage transformers, whose frequency response bandwidth is difficult to meet the requirements of real transmission of lightning wave spectrum, so the monitoring effect is generally not good. Collection, storage and transmission have resulted in huge data and inconvenient data analysis by the staff of the monitoring station

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