Electromagnetic current mutual inductor iron core on-line demagnetizing method

A current transformer, electromagnetic technology, applied in circuits, magnetic objects, electrical components, etc., can solve the problems of reducing measurement accuracy, affecting the working characteristics of current transformers, and high price, and achieving the effect of removing residual magnetism
CN1263048CInactive Publication Date: 2006-07-05TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2006-07-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

In the method, unbuilding device is connected to subsidiary side of electromagnetic type current transformer and is cascaded to load. The unbuilding device is composed of bi-directional thyristors, controlling circuits, and current transformer. Based on condition of current in circuit, or at fixed time (such as once per year), operation personnel controls the device: short circuit current passing through the unbuilding device starts it up automatically so as to remove residual magnetism on line totally.
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Description

technical field

[0001] The invention belongs to the technical scope of transformer manufacturing, in particular to an online demagnetization method for an electromagnetic current transformer iron core. Background technique:

[0002] Electromagnetic current transformers are mainly used for energy metering and relay protection in power systems, and their accuracy is of great significance to power economy and operational reliability. Transformer manufacturers have done a lot of work to ensure their accuracy. But there is no effective method to solve the influence of remanence on the working characteristics of current transformers. Wang Xiaoqi, Guo Keqin, Yao Min, and Shi Xiao reported in the literature: "The Influence of Remanence on the Accuracy of Current Transformers. Transformers, Issue 06, 1996, 5-9", when a short-circuit fault occurs in the power system, the current transformer will Large residual magnetism is generated, and for a current transformer of class 0.2, the a...

Claims

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