Coal mine anti-override trip current voltage and protection device

Abstract

The invention discloses a coal mine anti-override trip current voltage and protection device composed of a measuring component, a logic link and an execution output, wherein the measuring component isconnected to the logic link that is connected to the execution output. In the coal mine anti-override trip current voltage and protection device, after the power supply system fails, increase of theline current and decrease of the voltage are carried out, the current increases, the current protection acts, the voltage decreases to a set value and the voltage protection also acts, however the voltage protection can identify whether the fault is within or out of the protection range; if within the protection range, the current protection and the voltage protection act simultaneously, the current voltage and the protection device output as 1, and the execution output of the device acts to trip. Compared with simple current protection, the coal mine anti-override trip current voltage and protection device is less affected by the change of the operation mode, which can accurately identify the faults within and out of the protection range, effectively solve the problem of anti-override trip in the coal mine power supply system failure, and ensure the safe power supply of the coal mine.

Description

technical field [0001] The invention relates to the application technical field of 6kV-10kV line protection safety power supply in coal mines, in particular to a coal mine anti-overstepping tripping current voltage and protection device. Background technique [0002] Safe power supply plays a very important role in the safe production of coal mines. When a short circuit or abnormal operation occurs in the coal mine power supply system, the relay protection device can automatically, quickly and selectively remove the faulty components from the power supply system; the relay protection The device should meet the four basic requirements of selectivity, quick action, sensitivity and reliability; due to the large number of coal mine power supply systems, short power supply distance, and the current protection limitations of existing relay protection devices, when the coal mine power supply system When a fault occurs, most of the relay protection devices cannot meet the requiremen...

AI Technical Summary

Problems solved by technology

When an electrical fault occurs underground in a coal mine, due to the lack of selectivity of the protection device, a leapfrog trip is often caused, which greatly increases the scope of power outages in the coal mine; in addition to affecting the production of the coal mine, a large-scale power outage will also cause underground ventilation interruption and gas accumulation, which greatly Threatening the personal safety of coal mines and workers; however, in the process of coal mining and production, due to the short power supply distance of 6-10kV lines in coal mines, the large number of power supply stages, and the limitations of the current protection of existing relay protection devices, more than 90% of the power supply All lines have the problem of over-level tripping; in order to make up for the deficiencies in the prior art, the present invention aims to provide a coal mine anti-over-level tripping current voltage and protection device

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