Broadband characteristic testing system and method of DC current transformer for grounding electrode line
A DC current and characteristic testing technology, applied in instruments, measuring devices, measuring electrical variables, etc., can solve the problems of reducing the quality of synthetic signals, stray inductance, capacitance and magnetic field infection, reducing the accuracy of test results, etc. Noise interference, satisfying reliable operation, ensuring the effect of precision and accuracy
Active Publication Date: 2021-06-18
KUNMING UNIV OF SCI & TECH +1
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[0003] The broadband characteristics of DC current transformers for grounding electrode circuits mainly include transient step characteristics and frequency response characteristics. Among them, the national standard "DC Current Measurement Devices for High-Voltage Direct Current Transmission Systems Part 1: Electronic DC Current Measurement Devices" clearly stipulates that electronic The step response rise time of the DC current measuring device should be less than 400μs. The existing transient step characteristic detection equipment is tested by synthesizing the current waveform, but the current waveform is easily affected by the stray inductance, capacitance and magnetic field of the line when synthesizing. infection, reduce the quality of the synthesized signal, and then reduce the accuracy of the test results, so there is an urgent need for a high-precision and high-accuracy testing system and method for broadband characteristics of DC current transformers for grounding electrode lines
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[0037] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0038] The ground electrode circuit is one of the important components of the HVDC transmission system. When bipolar DC unbalanced operation or short-term single-stage operation occurs in the system, the current flowing into the ground electrode can return through the earth. AC grid, part of the current will flow in through the grounding poin...
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The broadband characteristic test system and method of DC current transformers for ground electrode lines provided by this application, wherein the test system includes DC transient step and high frequency source, DC electronic transformer calibration system and test objects, and the test objects include DC current mutual inductance device and merging unit; this application provides a standardized test system and method for the broadband characteristics of DC transformers, which can be used to judge the accuracy of fault current transmission when a DC grounding electrode line fails; this application The test system in the test system can simulate different system faults or abnormal working conditions, and realize the separation of data source and test received data, ensure the accuracy of the sampling process, and reduce noise interference, so this application can guarantee the accuracy of broadband characteristic test results Precision and accuracy to meet the reliable operation of the grid.
Description
technical field [0001] The present application relates to the technical field of DC current transformer detection, and in particular to a broadband characteristic testing system and method of a DC current transformer for ground electrode lines. Background technique [0002] The DC current transformer is one of the important equipment in the DC transmission system. The type test, field test, handover test and periodic inspection of the DC current transformer before installation are indispensable tasks to ensure the safe operation of the DC transmission system; at the same time, the ground electrode The circuit is one of the important components of the HVDC transmission system. When bipolar DC unbalanced operation or short-term single-stage operation occurs in the system, the current flowing into the ground electrode can return through the earth. If there is an AC grid near the ground electrode , then part of the current will flow in through the grounding point of the transfor...
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IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 束洪春朱梦梦田鑫萃曹敏罗强林聪
Owner KUNMING UNIV OF SCI & TECH