Low voltage large current outlet three-phase one tank current mutual inductor mounting and shielding structure

Abstract

The invention belongs to the field of transformer fabrication and specifically relates to a mounting and shielding structure of a three-phase-in-one-tank current transformer at the low-voltage large-current outlet terminal in a high-capacity three-phase transformer. The mounting and shielding structure is positioned above the low-voltage side of the transformer and comprises a low-voltage boosting seat, an electric shield means is arranged and three-phase low-voltage terminals of the transformer are all inserted inside the low-voltage boosting seat, sharing the same boosting seat and introduced outwards from the top of the boosting seat; three current transformers which are covered around the three-phase low-voltage terminals and fixed inside the boosting seat; and isolating shields arranged between the adjacent current transformers and connected with the boosting seat at only one point. The invention has the advantages that the three-phase-in-one-tank current transformer at the low-voltage outlet terminal has compact outlet structure; the electric shielding effect is improved to prevent the occurrence of local overheat; and the isolating shield can efficiently control the influence of magnetic field due to large current on the measurement accuracy of heterophase current transformer and avoid the burning down of the current transformer during long-term operation under high temperature.

Description

technical field [0001] The invention belongs to the field of transformer manufacturing, in particular to an installation and shielding structure of a three-phase common-box current transformer with a large capacity and a low-voltage and high-current outgoing line of a three-phase transformer. Background technique [0002] At present, in the existing large-capacity, high-voltage generator transformers, the current transformers at the low-voltage and high-current input ends are all installed on the single-phase sealed mother side of the generator. The low voltage should be a single outlet structure, which will affect local overheating. If a common box structure is adopted, the shielding problem must be solved. Contents of the invention [0003] The purpose of the present invention is to provide an installation and shielding structure of a low-voltage, high-current outgoing three-phase common box current transformer of a transformer that shares a raised seat for three phases...

AI Technical Summary

Problems solved by technology

[0002] At present, in the existing large-capacity, high-voltage generator transformers, the current transformers at the low-voltage and high-current input ends are all installed on the single-phase sealed mother side of the generator. The low voltage should be a single outlet structure, which will affect local overheating

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