Built-in high voltage side electronic current transformer and circuit breaker

Abstract

The invention relates to a built-in high voltage side electronic current transformer and a circuit breaker. The built-in high voltage electronic current transformer, which comprises high voltage side coaxially stacked Rogowski coil and low power coil; and the two coils are connected with a signal processing circuit. The built-in high voltage electronic current transformer is characterized in that: an energy taking coil is coaxial with the two coils, and the output of the energy taking coil is connected with a power circuit for supplying power to the signal processing circuit. The energy taking coil is arranged, the signal processing circuit and a power supply thereof are integrally arranged on the high voltage side of the transformer, and the power is directly taken from a bus, so that resources are saved, the operation is convenient to implement and the application is safe. For the circuit breaker with the built-in transformer and the electronic current transformer, the processing circuit and the power supply thereof are integrally arranged on the high voltage side, the energy is convenient to take, and the coils are suspended to prevent breakdown.

Description

technical field [0001] The invention relates to the field of electronic current transformers, in particular to a built-in high-voltage side electronic current transformer and a circuit breaker built with the transformer. Background technique [0002] In power systems, current transformers are widely used as output devices for energy metering and relay protection signals. With the continuous improvement of the voltage level of the power system and the increasing transmission capacity, the traditional transformer presents many problems such as easy saturation, low precision, small dynamic range, and narrow frequency response. With the development of intelligent technology, it is the general trend to replace traditional current transformer coils with electronic current transformer coils, and electronic current transformers have obvious advantages. There are two types of current electronic current transformers: active type and passive type. This article deals with active elect...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a built-in high-voltage side electronic current transformer and circuit breaker to solve the problems of inconvenient use and low safety of the existing electronic current transformer signal processing unit

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