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A networked protection system and method for railway power distribution system

A technology of power distribution system and protection system, which is applied in the direction of overcurrent protection, emergency protection circuit devices, electrical components, etc., and can solve the problem of long overcurrent protection action time limit, affecting railway traffic safety, rapid removal of unfavorable faults, etc. to reduce the difficulty of operation and maintenance, realize intelligent monitoring, and improve reliability

Active Publication Date: 2020-04-21
CHENGDU SOUTHWEST JIAOTONG UNIV XUJI ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to prevent the feeder, self-closing through line and capacitor from leapfrog tripping when the feeder, bus coupler or voltage regulator fails, causing the power outage area to expand, affecting the safety of railway traffic, and step-by-step coordination leading to close to the power point The time limit of the overcurrent protection at the location is long, which is not conducive to quick fault removal. The purpose is to provide a networked protection system and method for the railway power distribution system to solve the problem of reliability, selectivity, quick action, and sensitivity of relay protection. The problem of realizing the perfect protection of the entire railway power distribution system

Method used

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  • A networked protection system and method for railway power distribution system
  • A networked protection system and method for railway power distribution system
  • A networked protection system and method for railway power distribution system

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Embodiment 1

[0035] Such as figure 1 As shown, a networked protection system of a railway power distribution system of the present invention includes a railway power distribution system and a railway power distribution protection system. The railway power distribution system includes two incoming lines as power sources and six bus bars. The two bus bars in the bus bar are the No. 1 bus bar and the No. 2 bus bar. The No. 1 bus bar and the No. 2 bus bar are bus-coupled and connected to the two incoming wires respectively. The No. 1 bus bar and the No. 2 bus bar are also connected to the feeder and the capacitor respectively. Connected to a voltage regulator, the voltage regulator is also connected to the remaining four bus bars, the remaining four bus bars are No. 3 to No. 6 bus bars and are respectively connected to the through lines, the railway power distribution protection system is connected to the six bus bars and The connected feeder lines, capacitors, voltage regulators and through lin...

Embodiment 2

[0044] Such as Figure 3 to 6 As shown, the present invention relates to a networked protection method for a railway power distribution system, including overcurrent protection. Its working process is: when the line fails, the current measured by the microcomputer protection device through its current transformer is greater than the rated load current , The microcomputer protection device trips the circuit breaker based on the current signal to realize over-current protection. The principle block diagram of overcurrent protection is as follows: image 3 As shown, image 3 Among them, Ia, Ib, Ic are the A, B, and C three-phase protection currents of the line respectively; Tdz is the operating time limit of overcurrent protection.

[0045] As a further optimization of the present invention, on the basis of the above structure, the present invention also adds a low voltage start. Its working process is: when the line fails, the microcomputer bus tie protection device passes through ...

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Abstract

The invention discloses a networked protection system and method for a railway power distribution system based on a GOOSE mode. The networked protection system comprises a railway power distribution system and a railway power distribution protection system, and is characterized in that the railway power distribution system comprises two incoming lines acting as a power supply and six busbars, two of the six busbars perform bus-coupling and are respectively connected with the two incoming lines, the busbar 1 and the busbar 2 are further respectively connected with a feeder line, a capacitor and a voltage regulator, the voltage regulators are further connected with the remaining four busbars, the remaining four busbars are respectively connected with through lines, and the railway power distribution protection system is matched with the six busbars and the feeder lines, the capacitors, the voltage regulators and the through lines which are connected with the busbars. The railway power distribution system adopting the above structure meets the requirements of reliability, selectivity, speediness and sensitivity of relay protection, and perfect protection for the whole railway power distribution system is realized.

Description

Technical field [0001] The invention relates to a networked protection system of an electrical system, in particular to a networked protection system and method of a railway power distribution system. Background technique [0002] GOOSE is a fast message transmission mechanism in IEC61850, used to transmit important real-time signals between IEDs in substations. GOOSE uses network signals to replace the hard-wired communication method between conventional substation devices, which greatly simplifies the secondary cable wiring of the substation. It is mainly used to realize the information transfer between multiple IEDs, including the transmission of tripping and closing signals, with high transmission success probability. Based on GOOSE network transmission instead of traditional hard-wiring, it realizes reliable transmission of real-time information such as switch position, blocking signal and trip command. [0003] At present, under the power supply mode of domestic railway pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/28H02H3/08H02J13/00
CPCH02H3/08H02H7/28H02J13/0017
Inventor 郭华任雪涛刘晃蒋文超
Owner CHENGDU SOUTHWEST JIAOTONG UNIV XUJI ELECTRIC