Direct-current protection system with multiple paths of optical fiber interfaces and direct-current protection method

A DC protection system and DC protection technology, applied in the direction of DC network circuit devices, emergency protection circuit devices, circuit devices, etc., can solve problems such as unreliability, poor anti-interference ability, slow action, etc., and achieve accurate and fast tripping and anti-interference The effect of strong ability, accurate and quick action

Active Publication Date: 2015-01-14
NARI TECH CO LTD
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Problems solved by technology

[0005]It is difficult for the DC protection device to distinguish the fault current from the running current of the train, and it is difficult to locate the fault location;
[0006]The double-sided jumper usually adopts relays, which are realized by laying long-distance cables to transmit contact signals. It is unreliable, slow in action, unable to transmit current and voltage, and debugging Disadvantages such as inconvenient, long transmission distance and poor anti-interference ability;
[0007]Relays are usually used for cross-region power supply, which are unreliable, slow in action, unable to transmit current and voltage, inconvenient to debug, and long transmission distances leading to anti-interference ability poor disadvantage

Method used

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  • Direct-current protection system with multiple paths of optical fiber interfaces and direct-current protection method

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Embodiment Construction

[0024] A DC protection system with a multi-channel optical fiber interface, applied to a subway DC protection device, characterized in that:

[0025] 1) The first optical fiber (called sampling optical fiber) interface of the DC protection device communicates with the DC isolation amplifier module to obtain the DC current and voltage collected by the DC isolation amplifier module for DC protection and monitoring;

[0026] 2) The second optical fiber of the DC protection device (referred to as the opposite side communication fiber) communicates with the opposite side DC protection device, exchanging the action information of the protection device and the collected current and voltage signal quantities, which are used to determine the section of the train running, and carry out Fault or train operation location, used for protection tripping and double-sided joint tripping;

[0027] 3) The third optical fiber of the DC protection device (called back-to-back communication optical ...

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Abstract

The invention discloses a direct-current protection system with multiple paths of optical fiber interfaces and a direct-current protection method. Protection device action information and acquired current and voltage semaphores are mutually exchanged through an optical fiber, an opposite side direct-current protection device, a back direct-current protection device and an opposite device at the opposite side of the back direct-current protection device, so that intervals of operation and positions of failures of a train are determined, and the protection devices can rapidly and accurately carry out tripping and bilateral shunt tripping, and transmit information during region-crossing power supply. The direct-current protection system has the advantages of accurate and rapid action, simpleness and convenience, and strong interference resistance capacity.

Description

technical field [0001] The invention relates to a relay protection applicable to a DC power supply system, which belongs to the technical field of electric engineering. Background technique [0002] The DC power supply system usually adjusts the voltage of the AC power supply system to the voltage required by the rectifier device through a rectifier transformer, and then outputs it to the rectifier device. After being rectified by the rectifier device, the output of the rectifier device is the DC power required by the DC power supply system. The rectification transformer and the rectification device constitute a rectification unit. [0003] Usually a shunt is installed on the output line of the DC power supply. The output of the shunt is transformed and output to the DC protection device as the original signal input by the DC protection device. The DC protection device analyzes the signal based on the signal. If it is judged to be DC If the line fails, a trip command will b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J1/00
Inventor 李钢余建国贾浩
Owner NARI TECH CO LTD
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