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
CN105067906BActive Publication Date: 2017-12-19ELECTRIC POWER SCHEDULING CONTROL CENT OF GUIZHOU POWER GRID CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ELECTRIC POWER SCHEDULING CONTROL CENT OF GUIZHOU POWER GRID CO LTD
Publication Date
2017-12-19

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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.
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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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