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Capacitive voltage transformer amplitude-frequency characteristic detection system and method

A voltage transformer and amplitude-frequency characteristic technology, applied in the field of capacitive voltage transformer amplitude-frequency characteristic detection system, can solve problems such as inaccurate detection, and achieve the effect of ensuring stable operation and promoting development

Active Publication Date: 2020-02-21
STATE GRID XINJIANG ELECTRIC POWER COMPANY HAMI POWER SUPPLY +3
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  • Application Information

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Problems solved by technology

[0003] The present invention provides a detection system and method for the amplitude-frequency characteristic of a capacitive voltage transformer, which overcomes the deficiencies in the prior art and can effectively solve the problem of inaccurate detection in the existing detection method for the amplitude-frequency characteristic of a capacitive voltage transformer. question

Method used

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  • Capacitive voltage transformer amplitude-frequency characteristic detection system and method
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  • Capacitive voltage transformer amplitude-frequency characteristic detection system and method

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Embodiment 1

[0032] Embodiment 1: as attached figure 1 As shown, the capacitive voltage transformer amplitude-frequency characteristic detection system includes a controllable frequency generating unit, a detection circuit, a calculation processing unit, a voltage detection unit, the first measured capacitive voltage transformer and the second measured capacitive voltage Transformer, detection circuit includes high-voltage side and low-voltage side;

[0033] The controllable frequency generating unit is connected to the detection circuit, and two busbars are connected in parallel on the high-voltage side of the detection circuit, and the two busbars are respectively connected to the primary side of the first measured capacitive voltage transformer and the second measured capacitive voltage transformer. connected to the primary side of the transformer, and the voltage detection unit is respectively connected to the secondary side of the first measured capacitive voltage transformer and the ...

Embodiment 2

[0039] Embodiment 2: as attached figure 2 As shown, the method for detecting amplitude-frequency characteristics of a capacitive voltage transformer includes the following steps:

[0040] S1, the controllable frequency generating unit injects a signal into the detection circuit, and according to the set frequency adjustment range, the controllable frequency generating unit changes the frequency of the injected signal. Here, the controllable frequency generating unit injects a signal into the detection circuit, that is, the controllable frequency generating unit injects a signal into the neutral point of the first transformer, and the signal enters the high voltage side of the first transformer through the neutral point.

[0041] S2, every time the frequency of the injected signal is changed, the voltage detection unit measures the secondary side voltage U of a set of first capacitive voltage transformers under test cvta and the secondary side voltage U of the second capaciti...

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Abstract

The invention relates to the technical field of power grid equipment detection and particularly relates to a capacitive voltage transformer amplitude-frequency characteristic detection system and method. The system comprises a controllable frequency generation unit, a detection loop and a calculation processing unit. The controllable frequency generation unit is connected with the detection loop,a high-voltage side of the detection loop is connected with two buses in parallel, the two buses are respectively connected with a primary side of a first detected capacitive voltage transformer and aprimary side of the second detected capacitive voltage transformer, and a voltage detection unit is respectively connected with a secondary side of the first detected capacitive voltage transformer and a secondary side of the second detected capacitive voltage transformer. The invention provides a unified standard capacitive voltage transformer amplitude-frequency characteristic detection method,the amplitude-frequency characteristic of the capacitive voltage transformer can be automatically and accurately detected, the amplitude-frequency characteristics of the secondary side voltage of thecapacitor voltage transformer is drawn, therefore, the stable operation of the capacitive voltage transformer is ensured, and the development of the electric energy quality of a power grid is furtherpromoted.

Description

technical field [0001] The invention relates to the technical field of power grid equipment detection, and relates to a detection system and method for the amplitude-frequency characteristic of a capacitive voltage transformer. Background technique [0002] At present, the scale of the grid power quality monitoring system is rapidly expanding, basically realizing the real-time monitoring of power quality indicators of large-scale new energy centralized access points, electrified railway access points, UHV DC access points and other typical nonlinear load access points. monitor. At the same time, with the installation and application of power quality monitoring devices on the power grid and power user side becoming more and more popular, harmonic voltage monitoring is becoming more and more important in the power system monitoring process. At present, the CVT circuit model is studied and the harmonic impedance model is proposed, the influence of its internal parameters on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 薛劲莹张陵杨吉耀袁宏崔永红王开科赵普志王明罗忠游焦春雷蔡永军
Owner STATE GRID XINJIANG ELECTRIC POWER COMPANY HAMI POWER SUPPLY
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