Grounded high-voltage power system insulation online detector

Abstract

The invention discloses a grounded high-voltage power system insulation online detector, which comprises auxiliary power bus ABC three phases, a grounding resistor R0, a grounding transformer T1 and a motor M. An input end of the grounding transformer T1 is connected with the auxiliary power bus ABC three phases; an output end of the grounding transformer is connected with one end of the grounding resistor R0; the other end of the grounding resistor R0 is connected with a capacitor C and an input end of a detector I respectively; and a detector II is arranged on abc three phases of an incoming line end of a power supply of the motor M. The grounded high-voltage power system insulation online detector can test the insulation in the operation of the high-voltage power system, and also can test the system insulation value during shutdown standby.

Description

technical field [0001] The invention relates to an insulation detector for a high-voltage power system, in particular to an on-line insulation detector for a grounded high-voltage power system. Background technique [0002] When high-voltage electrical equipment is running in the grid, if there are insulation defects inside it due to poor manufacturing, aging, and external damage, insulation accidents that affect the safe operation of the equipment and the grid will occur. Therefore, after the equipment is put into operation, the traditional method is to conduct regular power outages for preventive tests and maintenance, so as to detect the insulation defects inside the equipment in time and prevent insulation accidents. The main problems with this maintenance system are: [0003] 1. The equipment must be tested in a power failure, so that the operating efficiency of the equipment cannot be effectively improved; [0004] 2. It needs to be equipped with high-performance tes...

AI Technical Summary

Problems solved by technology

[0003] 1. The equipment must be tested in a power failure, so that the operating efficiency of the equipment cannot be effectively improved;

[0004] 2. Need to be equipped with high-performance test equipment, a large number of professional and technical personnel, heavy workload, long working hours and cumbersome power outage procedures, etc., resulting in waste of resources and unreasonable allocation;

[0005] 3. There is a certain degree of blindness in the regular maintenance of equipment, resulting in too many unnecessary power outages and maintenance, and even premature damage due to excessive disassembly and assembly.

The DC superposition method is to measure the insulation of a certain section of cable in the system; the DC component method is also to measure the insulation of a certain section of cable in the system; the test method of leakage current is for the insulation measurement of a certain motor, and it can only be measured when the motor is running. , the insulation cannot be measured when the motor is powered off

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