Secondary overvoltage protection device of current transformer

Abstract

The invention provides a secondary overvoltage protection device of a current transformer and relates to the technical field of electric power system overvoltage absorption. The secondary overvoltage protection device of the current transformer comprises a logic control circuit, an overvoltage detection circuit and a silicon controlled rectifier protection device. One end of the logic control circuit is connected with one end of the silicon controlled rectifier protection device and one end of the current transformer, and the other end of the logic control circuit is connected with one end of a circuit load. The other end of the silicon-controlled silicon controlled rectifier protection device is connected with one end of the overvoltage detection circuit and the other end of the circuit transformer. The other end of the overvoltage detection circuit is connected with the other end of the circuit load. The overvoltage protection device provided by the invention is high in action speed, high in overloading capability, small in static leakage current and capable of meeting protection requirements of various kinds of current transformers.

Description

technical field [0001] The invention relates to the technical field of power system overvoltage absorption, in particular to a secondary overvoltage protector for a current transformer. Background technique [0002] Current transformers are widely used in primary measurement and control in power systems. If the secondary winding of the current transformer is open circuited or the primary winding flows abnormal current during operation, such as lightning strikes, resonant currents, and electrothermal charging currents, etc. , will generate thousands of volts or even tens of thousands of volts of high voltage on the secondary side, which will not only cause damage to the insulation of the secondary system, but also endanger the lives of workers. Contents of the invention [0003] The purpose of the present invention is to provide a secondary overvoltage protector for current transformers, which has fast action speed, strong overload capacity and small static leakage curr...

AI Technical Summary

Problems solved by technology

[0002] Current transformers are widely used for primary measurement and control in the power system. If the secondary winding of the current transformer is open circuited or the primary winding flows abnormal current during operation, such as lightning strikes, resonant currents, and electrothermal charging currents, etc. , will generate thousands of volts or even tens of thousands of volts of high voltage on the secondary side, which will not only cause damage to the insulation of the secondary system, but also endanger the lives of workers

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