Secondary side open circuit protector circuit of intelligent selection current transformer winding

Abstract

The invention relates to an intelligent selection current transformer winding secondary side open-circuit protector circuit, which relates to the technical field of power transmission and distribution switchgear. It is characterized in that it comprises an open-circuit protector, a measuring unit winding circuit, a protection unit winding circuit, and the measuring unit winding circuit and the protection unit winding circuit are respectively connected with the open-circuit protector. The invention has the characteristics of simple structure, convenient operation, effective inquiry and maintenance of lines and the like.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution switchgear, in particular to an intelligently selected secondary side open circuit protector circuit of a current transformer winding. Background technique [0002] With the increasing maturity of electrical automation, various protective components emerge in an endless stream. In the power system, the current transformer can reduce the large current to a small current for protection and measurement, but if the equipment runs for a long time, or the current transformer is in transit The open circuit of the secondary side will cause the voltage of the secondary side to rise, which will seriously affect the protection and even endanger the safety of personal and property. In today's existing products, the CT open circuit protector is inflexible. If the single-phase protection circuit current is open, the protector will be connected to the ground through the varistor, so t...

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Problems solved by technology

[0002] With the increasing maturity of electrical automation, various protective components emerge in an endless stream. In the power system, the current transformer can reduce the large current to a small current for protection and measurement. However, if the equipment runs for a long time, or the current transformer during transportation The open circuit of the secondary side will cause the voltage of the secondary side to rise, which will seriously affect the protection and even endanger the safety of personal property.

In today's existing products, the CT open-circuit protector is inflexible. If the single-phase protection circuit current is open-circuited, the protector will be connected to the ground through the varistor, so that the secondary side of the transformer will form a circuit, but at the same time the The protection function of the phase is also shielded, and the protection measurement and control unit connected to the phase has no effect

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