Measurement and control analysis system based on low-current grounding line selection device

Abstract

The invention discloses a measurement and control analysis system based on a low-current grounding line selection device. The system comprises an input module, a display module, a man-machine interface, a current collector, a voltage collector, a central controller, a microprocessor and a line selection unit module, single-wire grounding fault information is collected by the current collector and the voltage collector, processed by a digital to analog converter, and transmitted to the microprocessor, and the microprocessor identifies the fault information and sends the processed fault information to a communication module and a signal generator. According to the invention, onsite condition can be detected in real time, a more real detection result is provided, the automatic degree of the whole system structure is higher, the labor cost is reduced to certain extent, operation is rapid and accurate, selection errors or missing selection are avoided, the central controller is combined with the microprocessor during use, man-machine interaction, communication management and line selection tasks are distinguished clearly, and convenience is provided for post management and operation.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to a measurement, control and analysis system based on a small current grounding line selection device. Background technique [0002] Single-phase grounding is the most common fault in the medium voltage distribution network. Although the system can continue to operate with the fault after the grounding occurs, due to the increase in the voltage of the non-fault relative to the ground, if it is not handled in time, it may develop into non-fault phase insulation damage and continue. Threat of phase-to-phase short circuit. Timely and accurate determination of the grounding loop is the basis for quickly eliminating single-phase grounding faults. The protection device that can determine the grounding fault loop is usually called a small current grounding line selection device. Unsatisfactory. Contents of the invention [0003] The purpose of the present invention is to overcome the abov...

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Problems solved by technology

[0002] Single-phase grounding is the most common fault in the medium voltage distribution network. Although the system can continue to operate with the fault after the grounding occurs, due to the increase of the non-fault relative to the ground voltage, if it is not handled in time, it may develop into a non-fault phase insulation failure and continue. Threat of phase-to-phase short circuit

Timely and accurate determination of the grounding loop is the basis for quickly eliminating single-phase grounding faults. The protection device that can determine the grounding fault loop is usually called a small current grounding line selection device, but early line selection devices often have misselection and missed selection. unsatisfactory

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