Insulation monitoring device with self-inspection and ground connection location functions

Abstract

The invention relates to the technical field of electric power detection, in particular to an insulation monitoring device with self-inspection and ground connection location functions. According to the insulation monitoring device, a host is connected with multiple detection modules and each detection module is connected with 16 current transformers, so that the need of long haul communication due to different protection chambers in the field is met; meanwhile, current transformers can be additionally arranged at different positions of the same feeder line, the host judges ground fault pointpositions of a field direct current system according to a signal situation that whether the current transformers at different positions are detected or not, so that an automatic precise location function when a ground fault occurs is realized, a manual troubleshooting range is shortened, and a fault point can be conveniently and quickly found; besides, the device performs self-inspection on all the current transformers regularly everyday, whether the current transformers are normal or not is monitored, and abnormal current transformers are displayed by virtue of an LCD display unit.

Description

technical field [0001] The invention relates to the technical field of electric power detection, in particular to an insulation monitoring device capable of self-inspection with a grounding and positioning function. Background technique [0002] In the power system, the DC power system is used in hydropower, thermal power plants, and various substations. The DC system is mainly composed of battery packs, charging devices, DC feeder panels, DC power distribution cabinets, DC power monitoring devices, and DC branch feeders. The DC power system is a system that provides power for protection, and its stability and reliability directly affect the working conditions. Among the factors affecting the stability and reliability of the DC power supply system, the ground fault is one of the main faults, and the DC load generally adopts the design principle of radiation power supply, the DC loop cables are widely distributed, there are many components, and the on-site operating condition...

AI Technical Summary

Problems solved by technology

Among the factors affecting the stability and reliability of the DC power system, the grounding fault is one of the main faults, and the DC load generally adopts the design principle of radiation power supply, the DC loop cables are widely distributed, there are many components, and the field operating conditions are poor. When two or more points of the system are grounded, it may cause the relay protection device and switch of the power transmission and transformation equipment to refuse to operate and malfunction, and it is difficult to find the location of the fault point when a grounding or insulation reduction fault occurs

However, the vast majority of existing DC system insulation monitoring devices only have the function of branch line selection, and can only locate a fault on a certain branch line, but cannot locate the specific location of the fault point in the branch line.

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