A current transformer capable of reducing partial discharge and its manufacturing method

Abstract

A current transformer being able to reduce local discharge comprises a housing, a secondary coil, a framework, an annular iron core, and a metal shielding barrel; the secondary coil is wrapped on the framework; the annular framework is sleeved on the annular iron core; the outer surface of the secondary coil is wrapped by an entire piece of semiconductor electric cloth; the outer surface of the metal shielding barrel is coated with a semi-conductive paint layer after being processed with abrasive blasting; the metal shielding barrel is fixed inside the housing by the semi-conductive paint layer; the metal shielding barrel is integrally connected with high-voltage lead wires, and casted into an integral structure, i.e., the housing, by epoxy resin; and the housing is closely and seamlessly fitted to the secondary coil, the metal shielding barrel and the high-voltage lead wires. Further provided is a manufacturing method of the current transformer. The electric field structure of the current transformer is very even; the micro-gap discharge, point discharge and lead wire discharge are reduced.

Description

technical field [0001] The invention relates to the field of electrical equipment and its manufacture, in particular to a current transformer capable of reducing partial discharge and its manufacturing method. Background technique [0002] In the power system, the large-scale bus-type current transformer often affects the long-term safety and stability of the system due to the high partial discharge of the transformer. Threat to reliability of power supply. At present, this type of structural transformer generally adopts the method of outsourcing semi-conductive paper and externally brushing semi-conductive paint to reduce the local and balanced electric field, and the effect is not very satisfactory. In response to this situation, our company has invented a new type of current transformer, which can basically eliminate the partial discharge and reduce the safety hazards of long-term operation. Contents of the invention [0003] The object of the present invention is to ...

AI Technical Summary

Problems solved by technology

At present, this type of structural transformer generally adopts the method of outsourcing semi-conductive paper and externally brushing semi-conductive paint to reduce the local and balanced electric field, and the effect is not very satisfactory.

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