Protective current transformer saturation detection method based on skewed distribution

A technology of a current transformer and a detection method, which is applied to instruments, measuring devices, measuring electrical variables, etc., can solve problems such as high accuracy and speed, and achieve the effects of improving calculation speed, ensuring accurate and reliable action, and improving reliability.

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

All of them can realize the saturation detection of current transformers, but there are advantages and

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  • Protective current transformer saturation detection method based on skewed distribution
  • Protective current transformer saturation detection method based on skewed distribution
  • Protective current transformer saturation detection method based on skewed distribution

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Embodiment Construction

[0029] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The invention proposes a protection current transformer saturation detection method based on skew distribution, and can accurately and quickly detect the saturation of the current transformer. The whole process is as Figure 7 shown in the flow chart.

[0031] Depend on 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 u is the excitation current, X u is the exciting reactance, U 2 is the load terminal voltage, X a , R a Respectively, CT secondary winding leakage reactance and resistance. Establish figure 2 The power system simulation model shown is a double-sided power supply system, the phases on both sides are inconsistent, and a fault is set in the middle of the line to...

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Abstract

The invention provides a protective current transformer saturation detection method based on skewed distribution. Firstly CT secondary current is sampled; then current waveform is intercepted near the waveform peak by adopting short data windows so that local current waveform symmetrical about the peak is obtained; waveform mirror image transformation is performed on the intercepted waveform and then coefficient of skewness of the waveform is calculated by skewed distribution; and the coefficient of skewness is compared with the fixed value of the pre-set coefficient of skewness so that saturation of a current transformer is judged. Problems of low detection speed and low detection precision in saturation of the current transformer can be solved, and the CT saturation situation can be rapidly and accurately detected only by utilizing sampling data of half cycle so that reliability of relay protection can be enhanced to some extent, and thus the method also has certain reference significance in the actual engineering application.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, in particular to a method for detecting the saturation of a current transformer for protection based on skew distribution. Background technique [0002] In order to monitor the operating status of the power system, a large number of secondary devices are required to accurately transmit relevant information of the primary system. The current transformer for protection is an important device for measuring the primary current of the system. The secondary current of the relay is collected by the relay protection device. For the protection principle that needs to use the amount of current, the protection device will judge the state of the primary side of the system based on the secondary current, and decide whether the protection device will act or not. If the relay protection Misoperation, refusal or delayed action of the device will cause great damage to the primary sy...

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Application Information

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IPC IPC(8): G01R35/02
Inventor 白加林高昌培王宇恩戴宇赵武智牛静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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