Polarity verifying device for remote-control three-phase current transformer

Abstract

The invention discloses a polarity verifying device for a remote-control three-phase current transformer. The polarity verifying device comprises a three-phase current transformer polarity verifying instrument and a remote controller, wherein the three-phase current transformer polarity verifying instrument comprises a wiring port A, a wiring port B, a wiring port C, a wiring port COM and a secondpower supply. According to the polarity verifying device, the labor can be greatly saved, and operators for ''dotting'' and ''lifting'' outdoors in a traditional manner can be omitted; and by utilizing a remote control manner, a link for communicating by virtue of communication equipment in a traditional manner can be omitted, errors in a verifying result caused by poor communication equipment isreduced, and the verifying reliability of the current transformer is greatly improved. The polarity verifying device can meet the technical conditions during the verification of the three-phase current transformer, the deficiencies of term-by-term operation in the traditional manner are improved, and the verifying operation efficiency is greatly improved.

Description

technical field [0001] The invention relates to a polarity verification device for a remote-controlled three-phase current transformer. Background technique [0002] The polarity verification of the current transformer (abbreviated as CT) is extremely important. If the verification is not performed or the verification is wrong, it may lead to incorrect action of the protection device. [0003] Such as figure 1 As shown, in the power system, the current transformer converts the primary large current of the system into a secondary small current for use by protection devices or metering equipment. Its main functions are as follows: failures in the power system affect the stable operation of the system If the fault is not isolated in time, it may cause the collapse of the power system and cause a large-scale blackout. The protection device judges whether the system is faulty according to the secondary current and secondary voltage of the system, and then operates the control sy...

AI Technical Summary

Problems solved by technology

[0005] The shortcomings of this method mainly include: more personnel are required, because the primary side and secondary side of the current transformer are located in two places far apart, and two to three people need to be arranged for cooperation in each place. A lot of manpower; indoor personnel and outdoor personnel cooperate through communication equipment. If the signal of the communication equipment is interfered or affects the communication signal, there may be deviations in the coordination between the two places, which will cause errors in the polarity verification results of the current transformer and affect the protection device and measurement. The correctness of the equipment; in the power system, the primary system is three-phase, and there are three sets of current transformers used. The traditional method can only be carried out on one phase and one phase, and it needs to be replaced continuously. The process is more cumbersome

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