CT secondary open circuit protection device based on zinc oxide arrester

Abstract

The invention relates to the field of circuit transformer load protection and particularly relates to a CT secondary open circuit protection device based on a zinc oxide arrester. A secondary side ofa circuit transformer is connected in series with a secondary load of a current transformer through a circuit, a connection line of a secondary side of the current transformer and the secondary load of the current transformer is connected in parallel with a pressure-sensitive resistor, a pressure-sensitive resistor connection circuit is connected in series with an information acquisition alarm element, and the secondary load of the current transformer is connected in parallel with the information acquisition alarm element. The CT secondary open circuit protection device is advantaged in that cost is low, action is reliable, metering and protection reliability during normal system operation is not influenced, and economical and stable properties are achieved.

Description

technical field [0001] The invention relates to the field of circuit transformer load protection, in particular to a CT secondary open-circuit protection device based on a zinc oxide arrester. Background technique [0002] For the traditional current transformer, its secondary side is absolutely not allowed to open circuit during operation. During the normal working process of the current transformer, the magnetic potentials generated by the primary and secondary currents demagnetize each other. Once the secondary side of the current transformer in operation is open circuited, all the current on the primary side will become a magnetizing current, resulting in excessive saturation and magnetization of the iron core, further heating and burning the current transformer coil. At the same time, when the magnetic field passes through zero, the secondary side winding will generate thousands or even tens of thousands of volts of high voltage, endangering the safety of the staff, bu...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a CT secondary open-circuit protection device based on a zinc oxide arrester, which effectively solves the problems of terminal fire, meter burnout, and personnel injury caused by the secondary open circuit of the current transformer in operation. The secondary open circuit protection device has the advantages of low cost, reliable operation, and does not affect the measurement and protection reliability of the system during normal operation.

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