A high-stability frequency conversion power supply dedicated to measurement and calibration of electric power maintenance test equipment

Abstract

Disclosed is a special high-stability variable frequency power supply for measuring and checking a power maintenance testing device. A rectifying filter circuit for converting alternating current into direct current is in cascade connection with an inverter circuit for converting direct current into alternating current, an output end of the inverter circuit is connected with a primary coil of an isolating transformer, and a secondary coil of the isolating transformer is connected with a signal input end of a low-voltage reactive power compensation circuit. A buffer starting circuit mainly comprises a time relay, and a signal output end of the buffer starting circuit is connected with a signal input end of the rectifying filter circuit. The special high-stability variable frequency power supply has input and output power isolating protection functions, and has the advantages of automatic voltage stability, adjustable frequency bandwidth, adjustable output voltage and fine interference resistance.

Description

technical field [0001] The invention relates to a power supply device for electric control test equipment, in particular to an AC variable frequency power supply device with high stability, frequency conversion, sine wave and micro-distortion used in a mobile laboratory for electric power maintenance test equipment. Background technique [0002] The condition-based maintenance test of power transmission and transformation undertakes the important task of diagnosing the defects of power transformation equipment, and plays an important role in ensuring the safe operation of the power grid. However, at present, the traceability of the accuracy and function of the condition-based maintenance test instruments and equipment is carried out in the laboratories of the provincial electrical research institutes with stable power systems, constant temperature, and constant humidity, and it is impossible to calibrate the equipment in real time. According to this situation, a mobile labor...

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Problems solved by technology

However, at present, the traceability of the accuracy and function of the condition-based maintenance test instruments and equipment is carried out in the laboratories of the provincial electrical research institutes with stable power systems, constant temperature, and constant humidity, and it is impossible to calibrate the equipment in real time

According to this situation, a mobile laboratory for electric power maintenance test equipment has been developed, which can carry out calibration and traceability of the equipment on site, but the stability, frequency, waveform and distortion of the on-site power supply often cannot meet the test requirements of standard instruments and equipment.

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