Calibration test apparatus for extra-high voltage direct current transformer

Abstract

The invention provides a calibration test device of a super-high direct current transformer, comprising an alternating current / direct current programmable power supply, a calibration sensor and a data processing and controlling device; the calibration sensor comprises two sensors: a zero-flux sensor and a broadband current sensor; the data processing and controlling device comprises a signal processing unit, an error measurement and calculation unit and a system control unit; the test currents generated by the alternating current / direct current programmable power supply are sequentially accessed in the calibration sensor and the direct current transformer to be calibrated; the output signal of the direct current transformer to be calibrated is transmitted to the signal processing unit; the standard measurement result of the calibration sensor is transmitted to the signal processing unit; the signal processing unit is connected with the error measurement and calculation unit; and the system control unit is connected with the alternating current / direct current programmable power supply. The calibration test device of a super-high direct current transformer used as a calibration measurement system can carry out calibration test on the accuracy of the direct current and harmonic wave measured by the direct current sensor and fills up the blank in the field.

Description

technical field [0001] The invention relates to a calibration test device for an ultra-high voltage DC current transformer, which belongs to the field of calibration, verification and detection of electric equipment. Background technique [0002] The DC current transformer provides control and protection signals for the UHV DC transmission system, and is an indispensable primary equipment for the normal operation of the DC transmission system. However, there is still a lack of effective calibration methods, especially on-site calibration after it is put into operation. In addition, all DC current transformers have the functions of measuring DC current and harmonic current, and their calibration should be a comprehensive investigation of various measurement performances. However, the existing laboratory calibration test devices can only calibrate DC or harmonic current alone. Harmonics cannot reflect the real operating conditions of the transformer in the transmission line. ...

AI Technical Summary

Problems solved by technology

[0002] The DC current transformer provides control and protection signals for the UHV DC transmission system. It is an indispensable primary equipment for the normal operation of the DC transmission system. However, there is still a lack of effective calibration methods, especially on-site calibration after it is put into operation.

In addition, all DC current transformers have the functions of measuring DC current and harmonic current, and their calibration should be a comprehensive investigation of various measurement performances. However, the existing laboratory calibration test devices can only calibrate DC or harmonic current alone. Harmonics, which cannot reflect the real operating conditions of the transformer in the transmission line

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