Method for measuring voltage to earth of protective pressing plate and special grounded port

Abstract

The invention relates to a method for measuring the voltage to earth of a protective pressing plate and a special grounded port, belonging to the technical filed of electric power measurement. The technical scheme is that the special grounded port comprises a ground terminal rod (1), a port body (2), a locknut (2), a front nut (4) and a hollow copper rod (6), wherein the port body is in a hollow cylinder structure, the outer surface is provided with a locking thread (5), the locknut and the front nut are arranged on the locking thread in a matching way, and the front nut is adjacent to the front end of the port body. A hollow cylinder at the front end of the port body is internally provided with a hollow copper rod, the ground terminal rod is arranged in the hollow cylinder at the rear end of the port body, and the ground terminal rod and the hollow copper rod are fixedly connected to be in an integrated structure; and the inner diameter of the hollow copper rod is matched with the outer diameter of a pen of a universal meter. The special grounded port can be reliably connected with the grounded pen of the universal meter, so that the accuracy rate and cheapness of the protective pressing plate for testing the voltage to earth can be improved; furthermore, the special grounded port is simple in structure and convenient to use, and the problems of the imperfect earth and inconvenient operation of the protective pressing plate can be solved when the voltage to earth of the protective pressing plate is measured.

Description

technical field [0001] The invention relates to a method for measuring the voltage of a protective pressure plate to ground and a special grounding interface, belonging to the technical field of electric power measurement. Background technique [0002] Relay protection and automatic device means that when the power components in the power system or the power system itself fails or is abnormal, it can send a warning signal to the operating personnel, or directly issue commands such as tripping to the controlled circuit breaker to terminate the development of these events complete set of automation equipment. This type of device controls the opening and closing of the switch through the pressure plate of the tripping and closing outlet. Measurement of the ground voltage at both ends of the pressure plate, when the control power supply is 220V DC, for the trip outlet pressure plate: [0003] (1) There is -110V from the top of the pressure plate to the ground, and 110V from th...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for measuring the voltage of the protective pressure plate to ground and a special grounding interface to ensure accurate measurement results and solve the problems of poor grounding and inconvenient operation when measuring the voltage of the protective pressure plate to ground

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