Device for detecting circuit opening of secondary circuit of current transformer

Abstract

The invention discloses a device for detecting circuit opening of a secondary circuit of a current transformer. The device comprises relays, normally open contacts of the relays, high-voltage converters and result generators, wherein the relays and the normally open contacts of the relays are connected with a first output end, a second output end, a third output end and a grounding end of the secondary circuit of the current transformer respectively, and the result generators are connected with the normally open contacts. According to the device, one relay and one high-voltage converter are arranged on each phase circuit of the secondary circuit of the current transformer for monitoring voltage of each phase circuit, high voltage on the circuit is timely obtained and converted into lower voltage when the secondary circuit of the current transformer is in an open circuit state, and further, a first detecting result which shows that the secondary circuit is in an open circuit state or a second detecting result which shows that the secondary circuit of the current transformer operates normally is generated, so that whether the secondary circuit of the current transformer is in an open circuit state is detected in real time.

Description

technical field [0001] The present application relates to the technical field of power systems, in particular to a secondary circuit open circuit detection device of a current transformer. Background technique [0002] In the power system, the current transformer linearly converts the primary large current into a small current suitable for the secondary equipment, and safely isolates the primary and secondary equipment, so that there is no electrical connection between the high and low voltage circuits, and the protection device collection equipment is reduced. Low cost, easy maintenance and debugging of operating equipment. [0003] In terms of electrotechnical principles, a current transformer is equivalent to an ideal current source, and its working principle is equivalent to a transformer, but the secondary load impedance of the current transformer is very small, close to a short circuit state. When the secondary circuit is open, the demagnetization effect of the second...

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Problems solved by technology

[0005] The technical problem to be solved in this application is to provide a current transformer secondary circuit open circuit detection device to solve the technical problem that the current transformer secondary circuit cannot be detected in the open circuit device in the prior art

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