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A Saturation Detection Method of Protective Current Transformer Based on Skew Distribution

A technology of current transformers and detection methods, which is applied in the direction of instruments, measuring devices, and measuring electrical variables, etc., can solve the problems of high precision and speed, and achieve the effects of improving calculation speed, fast detection speed, and simple algorithm

Active Publication Date: 2017-12-01
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 disadvantages, and few can meet the two requirements of high precision and fast speed at the same time.

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  • A Saturation Detection Method of Protective Current Transformer Based on Skew Distribution
  • A Saturation Detection Method of Protective Current Transformer Based on Skew Distribution
  • A Saturation Detection Method of Protective Current Transformer Based on Skew Distribution

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Embodiment Construction

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

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

[0031] Depend on figure 1 The equivalent model of the current transformer, i 1 represents the primary current flowing through the system, i 2 is the secondary side current of the current transformer, i u is the excitation current, X u is the excitation reactance, U 2 is the load terminal voltage, X a , R a are the leakage reactance and resistance of the CT secondary winding, respectively. Establish figure 2 The power system simulation model shown is a double-sided power system, and the phases on both sides are inconsistent, and a fault is...

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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 power system relay protection, in particular to a saturation detection method of a protection current transformer based on skewed distribution. Background technique [0002] In order to monitor the operating state of the power system, a large number of secondary devices are required to accurately transmit the relevant information of the primary system. The protective current transformer is an important device for measuring the primary current of the system. When the system is in an abnormal operating state or a fault state, the current transformer The secondary current of the device 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 this secondary current, and decide whether the protection device will act or not. If the relay protection Malfunction, refusal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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