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A Current Transformer Saturation Detection Method Based on Third-Order Central Moment

A technology of current transformer and detection method, which is applied in the field of power system relay protection, can solve the problems of high precision and speed, and achieve the effects of ensuring calculation speed, avoiding large degree of dispersion, and high detection accuracy

Active Publication Date: 2017-12-19
ELECTRIC POWER SCHEDULING CONTROL CENT OF GUIZHOU POWER GRID CO LTD +2
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  • Claims
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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.

Method used

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  • A Current Transformer Saturation Detection Method Based on Third-Order Central Moment
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  • A Current Transformer Saturation Detection Method Based on Third-Order Central Moment

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Embodiment Construction

[0028] The technical solution of the present invention will be further introduced in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] The present invention proposes a method for detecting CT saturation using an algorithm of the third-order central moment, which can effectively and quickly detect whether CT saturation occurs and the degree of saturation. The whole process is as Figure 6 shown in the flow chart.

[0030] 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 m is the excitation current. 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 saturate the current transformer. The method of the invention is used to sample the ideal secondary current and the a...

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Abstract

A current transformer saturation detection method based on the third-order central moment. Firstly, the secondary side current of the current transformer is sampled; secondly, the data window is used to intercept the current waveform again near the peak value of the waveform, and the sampling points symmetrical about the peak value are obtained. Waveform; after the waveform image transformation is performed on the intercepted waveform, the discrete coefficient is calculated with the third-order central moment; finally, the judgment result is output. In this process, it is necessary to calculate the discrete coefficient after mirroring of the standard sinusoidal current waveform, which can be regarded as a fixed value through analysis and calculation as a basis for comparison. The invention focuses on solving the problems of slow detection rate and low detection accuracy when the current transformer is saturated, and can quickly and accurately detect the occurrence of CT saturation by only using the sampling data of half a cycle, which improves the reliability of relay protection to a certain extent. Reliability has certain practical significance in ensuring its accurate and reliable action.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a detection method for realizing the saturation of an electromagnetic current transformer by using a third-order central moment algorithm. Background technique [0002] With the construction of ultra-high voltage and smart grids in my country, the reliability requirements of power systems are getting higher and higher. The increase of grid voltage level is accompanied by the increase of grid short-circuit current level, which poses greater challenges to the performance of electrical equipment. . Current transformer CT (Current Transformer) is one of the important electrical equipment in the power system, and it is also an important component for various secondary equipment to monitor and perceive the real operating conditions of the primary system. waves etc. For the current transformer used for relay protection, the most basic requirem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R35/02G01R29/04
Inventor 白加林高昌培王宇恩牛静赵武智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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