Zero-sequence current transformer and electric leakage circuit breaking system

Abstract

The invention provides a zero-sequence current transformer and an electric leakage circuit breaking system. The zero sequence current transformer comprises an iron core and a coil winding; the iron core is in a straight notch shape. The coil winding is wound on the outer surface of the iron core and is used for providing leakage current for a control module in the multi-pole residual-current circuit breaker and providing a leakage signal for a leakage module in the multi-pole residual-current circuit breaker; according to the novel zero sequence current transformer with the iron core of the straight notch type structure, the zero sequence current transformer can be conveniently installed on the multi-pole residual-current circuit breaker, meanwhile, it is guaranteed that the installation height of the zero sequence current transformer is consistent with that of the leakage coil of the circular structure in the existing two-pole residual-current circuit breaker, therefore, the height of the multi-pole residual-current circuit breaker does not need to be increased additionally, and thus miniaturization of the multi-pole residual-current circuit breaker is ensured, the multi-pole residual-current circuit breaker can be installed in a common distribution box, and troubles of large-scale disassembly, large-scale replacement and large-scale assembly in a low-voltage power grid are avoided.

Description

technical field [0001] The invention belongs to the technical field of zero-sequence current transformers, in particular to a zero-sequence current transformer and a leakage circuit breaking system. Background technique [0002] Zero-sequence current transformers are items used in the power industry. Zero-sequence current transformers are single-turn through-core current transformers, which are generally used for power protection equipment, such as: small current grounding line selection devices, computer harmonic elimination devices, leakage circuit breakers Devices and other supporting use. [0003] The leakage coil of the zero-sequence current transformer used in the existing leakage circuit breaker is usually a circular structure, and the current zero-sequence current transformer is often installed on the multi-pole leakage circuit breaker in an external way, and the multi-pole leakage circuit breaker Splicing and assembling together, the design of this structure and in...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of zero-sequence current transformer and earth leakage circuit breaker system, be used to solve the existing zero-sequence current transformer that is used for multipole earth leakage circuit breaker, because its earth leakage coil Due to the limitation of structural size, it is inconvenient to install it on a multi-pole leakage circuit breaker, and it will increase the volume of the multi-pole leakage circuit breaker

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