An automatic calibration device and method for an AC voltage divider

Abstract

An automatic calibration device for an AC voltage divider, including an industrial computer system connected in sequence, a broadband high-stable power supply, an intermediate frequency step-up transformer, a standard broadband voltage divider, and the standard broadband voltage divider is used for parallel connection with the AC voltage divider to be tested . The industrial computer system is used to send control signals to control the frequency and amplitude of the output voltage of the broadband high-stable power supply according to the preset voltage detection point, to sample the voltage of the standard broadband voltage divider, and to adjust the standard broadband voltage divider by feedback automatic control The error between the voltage at the high-voltage end and the target set voltage, when the voltage at the high-voltage end of the standard broadband voltage divider reaches the preset voltage detection point, the boost will automatically stop; the intermediate frequency step-up transformer is used to boost the output voltage of the broadband high-stable power supply Then output to the standard broadband voltage divider and the AC voltage divider to be tested. The invention has stable output voltage, small waveform distortion rate, and small frequency deviation, which can avoid reading changes of resistive-capacitive voltage dividers caused by voltage quality problems. The entire detection and calibration process is fully automatic, and manual or mechanical voltage regulation can be avoided. Process operation error.

Description

technical field [0001] The invention relates to the technical field of automatic calibration of high-voltage metering equipment in a power system, in particular to an automatic calibration device and method for an AC voltage divider. Background technique [0002] AC voltage divider and other high-voltage metering equipment need to compare their readings with standard metering equipment during metering calibration. High voltage, the power capacity required at this time is very large, usually only the mains plus voltage regulator or inverter power supply can be used as the input power of the intermediate frequency step-up transformer to boost the voltage. The mains fluctuates greatly and the waveform distortion rate may be relatively high, and there is a certain fluctuation in frequency, which causes the readings of the standard metering equipment to jump all the time during calibration, and because of the influence of frequency and waveform distortion rate, There are also ce...

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Problems solved by technology

The mains fluctuates greatly and the waveform distortion rate may be relatively high, and there is a certain fluctuation in frequency, which causes the readings of the standard metering equipment to jump all the time during calibration, and because of the influence of frequency and waveform distortion rate, There are also certain errors in the standard metering equipment used as a reference, and the mains plus voltage regulating transformer can only be calibrated against the 50Hz power frequency voltage divider; when the inverter power supply is used as the power supply of the intermediate frequency step-up transformer, the output The distortion rate of the waveform is high, and there are a large number of high-frequency interference components, among which the high-frequency interference will seriously affect the reading of the voltage divider, causing fluctuations and zero drift in the reading of the tested AC voltage divider

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