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Thyristor rectification traction power supply system and protection method

A traction power supply system and thyristor technology, applied in the field of transportation, can solve problems such as short mechanical and electrical life, and achieve the effects of reducing damage and short-circuit current.

Active Publication Date: 2016-08-10
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the existing technology and make use of existing mature and reliable power supply equipment as much as possible, the present invention improves the switching (opening and closing) function of the AC incoming line circuit breaker and the rectification function of the diode rectifier into an equivalent The function of the thyristor rectifier is to overcome the shortcomings of the short mechanical and electrical life of the mechanical switch of the AC incoming line circuit breaker, and to take advantage of the long life of the non-contact switch of the thyristor, which is more suitable for cutting and isolating frequently occurring short-circuit faults , to further improve the overall performance of the traction power supply system

Method used

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  • Thyristor rectification traction power supply system and protection method
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  • Thyristor rectification traction power supply system and protection method

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Embodiment Construction

[0034] The following takes the subway project of Line 3 in a certain city as an example: the line adopts a 1500V DC traction power supply system, with a total length of 18.84km and a total of 9 traction substations. The catenary resistance in the up (down) direction is 0.0135Ω / km, and the rail resistance in the up (down) direction is 0.0137Ω / km. Two 12-pulse rectifier units are used in parallel to form an equivalent 24-pulse operation.

[0035] figure 1 Shown is a schematic structural diagram of the traction substation in the embodiment of the present invention, in which two adjacent traction substations SS k and SS k+1 . Traction substation SS k including traction transformer TT k , Three-phase AC incoming circuit breaker QFJ k , thyristor rectifier U k , DC incoming line isolating switch QZS k , DC bus B k , DC feeder isolating switch QSZ k,1 、QSZ k,2 Wait. DC feeder isolating switch QSZ k,1 and QSZ k,2 Connect catenary OCS, negative isolating switch QSZ k* One...

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PUM

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Abstract

The invention discloses a thyristor rectification tractive power supply system and a protective method. When a short-circuit fault occurs, the thyristor of a traction substation thyristor rectifier closest to a fault element is stopped from working; if the sum value of the fault mark values, measured and calculated after the thyristor is stopped from working, of the element is larger than or equal to 1, a permanent fault is determined, the thyristors of other traction substation thyristor rectifiers of a whole line are stopped from working, all related direct-current isolation switches are opened, the thyristors of the traction substation thyristor rectifiers of the whole line return to work, the power supply of the system is restored, and if the sum value is not larger than or equal to 1, a temporary fault is determined, the related thyristors return to work, and the normal power supply of the system is restored. According to the thyristor rectification tractive power supply system and the protective method, a direct-current breaker can be eliminated, investment is reduced, implementation is convenient, and the system is suitable for carrying out new line construction or old line improvement on fields with lines which are not too long (within 20km and less than 10 traction substations). When the lines are too long, a small number of direct-current breakers can be used for dividing the tractive power supply system.

Description

technical field [0001] The invention belongs to the field of transportation, and in particular relates to a thyristor rectified DC traction power supply system and a relay protection method. Background technique [0002] The DC traction power supply system refers to the traction power supply system that obtains DC power from the AC power supply of the public grid through rectification. The DC traction power supply system consists of a traction substation and a traction network. Usually, a traction substation is composed of two independent (medium voltage) AC power sources and two 12-pulse traction rectifier units paralleling to form an equivalent 24-pulse wave. The traction rectifier unit is composed of traction transformer, diode rectifier and accessories, and the traction network is composed of catenary (or contact rail) and steel rail. Various faults may occur in the DC traction power supply system during operation. The relay protection device is responsible for finding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/06B60M1/00
Inventor 李群湛黄彦全刘炜舒泽亮郭育华于松伟李亚楠黄足平靳守杰周伟志陈民武李子晗张丽艳周阳夏焰坤
Owner SOUTHWEST JIAOTONG UNIV
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