Method for measuring electric conduction loop resistance of circuit breaker

Abstract

A method for measuring the electric conduction loop resistance of a circuit breaker is provided. The method comprises the following steps that: with grounding wires at two sides of the circuit breaker being not dismantled, I+ and U- of an HR loop resistance tester are directly connected with one side of a measured resistor RX; I- and U- of the HR loop are resistance tester are connected with the other side of the measured resistor RX; and then, testing is performed. According to the method for measuring the electric conduction loop resistance of the circuit breaker, self resistance of the grounding wires at the two sides of the circuit breaker, equipment grounding downlead resistance values, resistance values generated by frequent contact are far more larger than the resistance value of a switching-on loop inside the circuit breaker; equipment wire clamps at the two sides of the circuit breaker, which are connected with high-voltage leads, do not need to be dismantled; high-altitude?ascending and operation are not required; it does not need to dispatch and report to a work ticket signer and a work ticket licensor as well as apply to the work ticket signer and the work ticket licensor for dismantling the grounding wires at the two sides; testing can be accurately and fast performed on the electric conduction loop resistance of the circuit breaker (switch); and the method can assist in greatly shortening testing time, and greatly reducing outage time and significantly improving work efficiency and economic benefits.

Description

technical field [0001] The invention relates to a method for measuring the resistance of a conductive loop of a circuit breaker without removing the ground wires on both sides of a switch. Background technique [0002] In the power system, the circuit breaker (switch) is an important electrical equipment. National standard: GB50150-2006 "Electrical Equipment Handover Test Standard for Electrical Installation Engineering", Electric Power Industry Regulations DL / T596-1996 "Preventive Test Procedures for Electric Equipment" and State Grid Corporation's regulations Q / GDW 168-2008 "Condition Maintenance Test Regulations for Power Transmission and Transformation Equipment" all stipulate that when performing routine tests, regular inspections, preventive tests, and diagnostic tests on circuit breakers (switches), it is necessary to measure The loop resistance (contact resistance) between its moving and static contacts in the closing state is very important for its safe operation. ...

AI Technical Summary

Problems solved by technology

[0006] Existing problems: (1) For circuit breakers with high voltage levels, such as 110kV, 220kV, 500kV, etc., because the circuit breakers are relatively high, it is too troublesome to perform item 1); (2) It is not safe for the staff to remove and install the lead wires (climbing operation), which may cause the staff to fall from high altitude; (3) The case of the circuit breaker (porcelain bottle) may be easily damaged by the staff if they are not careful; (4) When the staff connects the equipment clamps of the lead wires, carelessness causes the clamps to contact the circuit breaker Not good, it will overheat and even burn out after the power is turned on

[0008] Existing problems: (1) After the work permit is completed for safety measures, it is difficult to temporarily apply for the removal of the grounding wires on both sides of the circuit breaker, and the higher the voltage level, the greater the difficulty; 2) Everyone agrees that the higher the voltage level, the longer the waiting time, sometimes it takes several hours or even longer, which prolongs the power outage time accordingly [Testing a circuit breaker (including A, B, C three-phase) circuit resistance, usually no more than 20 minutes]; (3) The most important thing is that after the grounding wire is removed, the safety factor of the working environment where the staff is located will be reduced, which may easily cause safety accidents

Images