Method for preventing induced electricity from hurting people during testing of power frequency parameters of circuits

Abstract

The invention belongs to the technical field of power frequency parameter testing and relates to a method for preventing induced electricity from hurting people during testing of power frequency parameters of circuits. A 220V alternating current contactor with normally-open and normally-closed contacts is used, states of the normally-open and normally-closed contacts of the contactor are ingeniously applied in the testing process of the power frequency parameters of the circuits, and the purpose of preventing the induced electricity from hurting people is achieved. Before circuit parameters are tested, a 220V alternating current contactor is not charged, a tested circuit 1 is grounded through the normally-closed contacts of the 220V alternating current contactor. During circuit testing, the 220V alternating current contactor is charged, the normally-open contactsare disconnected, and a circuit parameter testing instrument tests the tested circuits. The circuits are grounded and disconnected only when the circuit parameters are tested, and the accident of hurt of people by the induced electricity caused by misoperation by a test person when the power frequency parameters of the circuits are tested is thoroughly eliminated.

Description

Technical field [0001] The invention belongs to the technical field of power frequency parameter testing, and specifically relates to a method for preventing people from being injured by induction when testing line power frequency parameters. Background technique [0002] Before the newly-built high-voltage transmission line is put into operation, in addition to checking the line insulation and checking the phase, various power frequency parameter values ​​should also be tested for calculation of system short-circuit current, relay protection setting, estimation of power flow distribution, and selection of reasonable operation modes, etc. The actual basis. For lines that have been put into operation for many years, the actual power frequency parameters of the transmission line may change due to the aging of the conductors, the construction of adjacent lines, the change of soil resistivity, or the influence of factors such as climate, environment, and geography. Need to be tested...

AI Technical Summary

Problems solved by technology

However, this method is a measurement method carried out without power failure. The measurement considered for accuracy by setting the measurement plan does not reflect the operation to prevent the induction electric injury caused by misoperation, and cannot solve the situation in case of accidents. The problem

[0006] The patent document whose publication number is CN1707275A discloses a method for eliminating the interference induced voltage in the power frequency parameter test of the power transmission line, which includes the following steps: 1. A synchronous power supply synchronous with the interference induced voltage is used in the power frequency parameter test of the power transmission line; 2Two tests are carried out, and the synchronous power supply is used as the reference during the two tests; 3 Phase subtraction is carried out between the two tests. This method can eliminate the interference induced voltage in the power frequency parameter test of the transmission line, so as to improve the accuracy of the parameter test and accuracy, the testers will also make mistakes during the implementation of this method, and there may be electric shocks and even the possibility of loss of life. , Inductive electric shock accident occurred

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