Method for preventing override trip of mine power supply system

A technology for leapfrog tripping and power supply systems, applied in the direction of information technology support systems, electrical components, circuit devices, etc., can solve the problems of direct exchange of data or signals through fiber optic channels, no high-frequency channels, no mutual connection, etc., to avoid electromagnetic waves Effects of interference, improved safety, improved reliability

Active Publication Date: 2014-03-19
NARI NANJING CONTROL SYST
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  • Description
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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

Method used

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  • Method for preventing override trip of mine power supply system
  • Method for preventing override trip of mine power supply system

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Embodiment Construction

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and examples. However, the invention is not limited to the examples given.

[0033] 1. Construct the communication channel between the upper and lower substations

[0034] Each substation is equipped with a mine protection communication machine. Generally speaking, the incoming line switch of the lower-level substation needs to form a protective cooperation with the outgoing line switch of the upper-level substation. The mine protection device of the incoming line switch outputs a pair of differential signal contacts to the photoelectric conversion module, which converts the received electrical signal into an optical signal and transmits it to the photoelectric conversion module of the upper substation through the optical fiber channel, and the corresponding module on the opposite side After receiving the optical signal, convert it into a differential signal, an...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H7/22H02J13/00
CPCY02B90/2638Y04S40/124Y04S20/14Y02B90/224Y02B90/20
Inventor 吕良君马新平李永国张国浩刘杰王文进王斌
Owner NARI NANJING CONTROL SYST
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