The method of preventing mine power supply system from leapfrog tripping

Abstract

The invention discloses a method for preventing the override trip of a mine power supply system, which is characterized by comprising the following steps that: 1) each protection device in a transformer substation outputs a differential signal to a mine protection transceiver, the mine protection transceiver converts an electric signal into an optical signal and sends the optical signal to a mine protection transceiver on the opposite side, and the mine protection transceiver of a transformer substation on the opposite side converts the optical signal into an electric differential signal and inputs the electric differential signal into each protection device in the transformer substation; and 2) when a fault occurs at a certain position, the protection device closest to a fault point sends a protection blocking signal to the corresponding protection devices of superior switches in turn, and a reverse blocking quick overcurrent protection device of the superior protection device cannot act after the superior protection device receives the blocking signal, and quickly removes the fault because the protection device closest to the fault point does not receive the corresponding blocking signal. By the method, the problem that an optical fiber communication signal cannot be directly connected to the protection device is solved.

Description

technical field [0001] The invention relates to a new method for realizing relay protection, especially a new method for relay protection for mine power supply network based on mine protection communication machine and encoding and decoding methods to prevent skipping tripping, which belongs to electrical automatic control technology field. Background technique [0002] As far as the applicant knows, the relay protection equipment of the mine power supply network generally adopts a mine flameproof protection measurement and control device, which is installed in a high-explosion switch and has functions such as protection, measurement and control, and communication. Various faults, alarms for various abnormal operating conditions, and send data such as electrical parameters, operating parameters, power information, equipment working conditions, and fault information of underground electrical equipment to the ground monitoring center. [0003] However, there is a problem when...

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Problems solved by technology

[0003] However, there will be a problem when using this device: the underground protection devices for mines are basically isolated and not connected with each other, which limits their protection performance.

However, in the actual application underground, because the protection measurement and control device is installed in the high-explosive switch, the high-explosive switch has strong explosion-proof and sealing performance, and the currently used protection cannot directly exchange data or signals through the optical fiber channel. Does not have a high-frequency channel, and currently only reserves the interface for electrical signals

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