Electromagnetic type DC current transformer core and current transformer

Abstract

The invention belongs to the technical field of a mutual inductor, and relates to an electromagnetic type DC current transformer core and a current transformer. The electromagnetic type DC current transformer core comprises a silicon steel sheet iron core and an alloy iron core, wherein the shapes of the silicon steel sheet iron core and the alloy iron core are adaptive to each other, a first cutor two cuts are arranged in the silicon steel sheet iron core, an insulation non-magnetic material is arranged at the cut(s), the alloy iron core is formed by winding ultracrystalline alloy or permalloy, the alloy iron core is arranged in an inner cavity of the silicon steel sheet iron core, and an outer wall of the alloy iron core is in closely contact with an inner wall of the silicon steel sheet iron core to form an integral composite material iron core. By the electromagnetic type DC current transformer, the problem of poor signal conversion accuracy of a conventional electromagnetic current transformer when a DC component and a half-wave DC component exist in a primary system of a power grid is solved, and the electromagnetic type current transformer of which the converted signal specific value error is not larger than 2% and a phase error is not larger than 120' still can be met when a relatively large DC component and the half-wave DC component exist in the primary system.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to an electromagnetic current transformer capable of accurately converting primary signals in the case of a half-wave direct current or a direct current component in a primary system. Background technique [0002] Current transformer is one of the key equipment in power system. It can convert the large current signal in the primary system of the power grid into a standard small current signal (1A or 5A) with high accuracy according to the specified ratio, and it can be used in the secondary metering, measurement and protection system connected afterwards. It is said that the conversion accuracy of the current transformer is closely related to the accuracy of the trade settlement of the electricity fee, the collection of the power grid operation data and the monitoring of the operation status, and the safety of the power grid operation. [0003] With the rapid devel...

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Problems solved by technology

[0009] The present invention aims at the above-mentioned shortcomings, and provides an electromagnetic anti-DC current transformer core structure, and a current transformer produced by using this core structure, so as to solve the problem of conventional DC component and half-wave DC flow in the primary system of the power grid. The problem of poor signal conversion accuracy of electromagnetic current transformer

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