Detection method and device for high-voltage power quality

Abstract

The invention discloses a detection method and device for high-voltage power quality. A capacitive voltage divider is adopted for measuring a voltage signal, and a low-voltage current transformer with low energy consumption is adopted for measuring a current signal; the measured voltage signal and the measured current signal are simultaneously sent to a data acquisition and processing circuit suspended on a high-voltage side; and corresponding power quality information is calculated and analyzed, is sent to a comprehensive processing unit of a low-voltage part by an optical fiber, and is stored and displayed. The detection device can accurately measure a voltage harmonic signal, provides powerful data for monitoring harmonics, can accurately measure the current signal under the condition of small secondary load and owns wider linear working range. The data acquisition and processing circuit is suspended on the high-voltage side, which can avoid insulation between first load and secondary load, reduces the volume and the weight of the device and saves a great quantity of raw materials. The detection device can be directly installed on various routes when the existing route does not reserve the installation position, thus bringing convenience for improving systems.

Description

technical field [0001] The invention relates to the technical field of power quality monitoring, in particular to a high-voltage power quality detection method and device. Background technique [0002] Power quality refers to the degree to which various indicators related to the normal operation (or operation) of power supply, power consumption system and equipment, voltage and current deviate from the specified range. The detection of power quality is very important to improve the quality of power supply. The voltage signal of the existing power quality detection method is mainly obtained from the voltage transformer, and the current signal is mainly obtained from the current transformer. At present, capacitive voltage transformers are widely used in 110kV and above grades in many countries, but capacitive voltage transformers can only measure power frequency signals and cannot be used for harmonic detection. If the current signal is taken from the current transformer for...

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Problems solved by technology

At present, capacitive voltage transformers are widely used in 110kV and above in many countries, but capacitive voltage transformers can only measure power frequency signals and cannot be used for harmonic detection

If the current signal is taken from the current transformer for measurement, the load of the current transformer will be changed, which may affect the accuracy of measurement; if it is taken from the current transformer for protection, the secondary signal will be small when the

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