Current transformer secondary side open circuit protection device

Abstract

The invention provides a secondary side open circuit protection device of a current transformer. The secondary side open circuit protection device of the current transformer comprises a first protection unit, a second protection unit and a detection and control unit, wherein the first protection unit and the second protection unit are connected to two ends of a secondary side coil of the current transformer and connected to a load RL of a secondary side of the current transformer to form a parallel structure; and an input end of the detection and control unit is connected with the first protection unit and an output end of the detection and control unit is connected with a control terminal of the second protection unit. A protection execution action can be timely made when an open circuit appears in the secondary side of the current transformer, so that the damage to the current transformer or the load caused by a protection execution delay is effectively avoided; the service life of the current transformer is effectively ensured; and the secondary side open circuit protection device is simple in structure, high in stability and convenient to maintain.

Description

technical field [0001] The invention relates to a current transformer protection device, in particular to a current transformer secondary side open circuit protection device. Background technique [0002] Current transformers are widely used in power systems, such as the measurement, protection and control of lines. According to the characteristics of current transformers, it is strictly forbidden to open the secondary side of the current transformer during use. This is because the secondary side is open. In this state, all the current on the primary side of the current transformer is used for excitation to saturate the iron core of the current transformer, thereby inducing high voltage on the secondary side of the current transformer, which will cause serious harm. [0003] The secondary side open-circuit protection measures of current transformers in the prior art have the following disadvantages: on the one hand, the prior art often uses methods such as current and voltag...

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Problems solved by technology

[0003] The secondary side open-circuit protection measures of current transformers in the prior art have the following disadvantages: on the one hand, the prior art often uses methods such as current and voltage to make judgments, and then performs protection through the protection circuit, which has a slow response speed and often occurs when the protection device is executed. The current transformer or the load of the current transformer has been damaged during protection, resulting in irreparable losses; on the other hand, the protection method of the prior art has a complex structure, which is not conducive to maintenance, resulting in poor stability

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