Current transformer not afraid of open circuit on secondary side and production method thereof

Abstract

The invention discloses a current transformer not afraid of open circuit on a secondary side and a production method thereof. The current transformer comprises at least one straight-through bus-side current transformer and a conversion current transformer electrically connected with the straight-through bus-side current transformer, wherein the bus-side current transformer is used for inducing bus current, and the output terminal of the bus-side current transformer is electrically connected with the primary coil terminal of the conversion current transformer; the output of the conversion current transformer is used for connecting to a meter, and the conversion current transformer is arranged at one side of the bus-side current transformer; the mechanical connection and electrical isolation between the conversion current transformer and the bus-side current transformer can be achieved through resin cast between the conversion current transformer and the bus-side current transformer. The current transformer provided by the invention is equivalent to the situation that the output of the bus-side current transformer is fixedly connected with a load preventing from open circuit in parallel, so that the damage caused by open circuit on the secondary side can be fundamentally and effectively prevented and eliminated, the problem that the product explosion is caused by secondary open circuit can be avoided, and the current transformer is safe and reliable, and ensures personal and equipment safety.

Description

technical field [0001] The invention relates to a current transformer whose secondary side is not afraid of open circuit and a manufacturing method thereof. Background technique [0002] In every link of the power system, including power generation, power transformation, power transmission, power distribution and power consumption, it is necessary to measure, protect and control the line (hereinafter referred to as measurement and control). However, the current in the line varies widely, ranging from a few amps to tens of thousands of amps. These currents need to be converted into a relatively uniform current. In addition, the voltage on the line is generally relatively high, such as direct measurement and control. It is very dangerous. The function of the current transformer (CT for short) is to convert the primary current with a large value into a secondary current with a small value through a certain transformation ratio, which is used for protection, measurement and othe...

AI Technical Summary

Problems solved by technology

[0011] The present invention and the above schemes and the prior art all take remedial measures for the secondary open circuit of the current transformer after the event, and fail to fundamentally solve the problem

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