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Current transformer saturation detection method based on waveform area ratio method

A technology of current transformer and waveform area, applied in the field of current transformer saturation detection based on the proportion of waveform area, can solve the problems of low precision, complex algorithm, slow detection speed, etc., achieve low precision, simple principle, hardware and software the effect of low requirements

Active Publication Date: 2015-12-09
ELECTRIC POWER SCHEDULING CONTROL CENT OF GUIZHOU POWER GRID CO LTD +2
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Problems solved by technology

[0005] The purpose of the present invention is to propose a current transformer saturation detection method based on the area ratio of the current waveform for the problems of low precision, slow detection speed, and complex algorithm that may exist in the previous CT saturation detection algorithm.

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  • Current transformer saturation detection method based on waveform area ratio method
  • Current transformer saturation detection method based on waveform area ratio method
  • Current transformer saturation detection method based on waveform area ratio method

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The present invention proposes a current transformer saturation detection method based on the area ratio of the current waveform, which will be described below in conjunction with the accompanying drawings.

[0024] use figure 1 Equivalent model of current transformer, i 1 Indicates the primary current flowing through the system, i 2 is the current transformer secondary side current, i m is the excitation current, Zm is the excitation impedance, R 2 , L 2 are the secondary winding resistance and inductance. Using MATLAB simulation software, build figure 2 The power system model shown is a simple system with two-sided power supply, the phases of the two-sided power supply are inconsistent, a current transformer is built on one side, and a short-circuit fault is set on the line. After the simula...

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Abstract

The invention provides a current transformer saturation detection method based on a waveform area ratio method. Firstly secondary side current of a current transformer is sampled; then a standard sinusoidal current waveform is defined, normalization processing is performed on the actual saturated secondary side current with the maximum value acting as reference, and area formed by the actual saturated secondary side current waveform and a time axis and area formed by the standard sinusoidal current waveform and the time axis through enclosing are obtained via calculation; then ratio of area formed by the actual saturated secondary side current waveform and the time axis to area formed by the standard sinusoidal current waveform and the time axis is calculated; and finally a result is outputted and comparison and judgment are performed. Problems of low detection speed and low detection precision in saturation of the current transformer can be mainly solved, i.e. sampling data within a half cycle can be utilized to detect the saturation behavior of the CT sensitively through the area ratio, and stability of relay protection work can be enhanced to some extent.

Description

technical field [0001] The invention belongs to the technical field of relay protection of electric power systems, and in particular relates to a current transformer saturation detection method based on waveform area ratio. Background technique [0002] The current transformer (Current Transformer, CT) is an important measuring device in the power system, and its normal operation is directly related to the safety of the power system. Now the voltage level of 220kV and above requires dual configuration, and the P-level current transformer with relatively poor transient performance in the past also needs to complete the protection measurement task. In the field, CT saturation caused by excessive primary current has occurred many times, resulting in secondary current distortion, and finally accidents of protection overstepping trips. Therefore, the problem of CT saturation has become one of the hot issues concerned by power system researchers. [0003] For the common electrom...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R35/02
Inventor 高昌培白加林王宇恩赵武智牛静戴宇郑涛黄婷马玉龙赵建新
Owner ELECTRIC POWER SCHEDULING CONTROL CENT OF GUIZHOU POWER GRID CO LTD
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