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A high-speed railway power supply network system and its protection method

A technology for power supply networks and high-speed railways, applied in overcurrent protection, emergency protection circuit devices, power lines, etc., can solve problems that cannot be used as protection criteria, inapplicability, extraction, etc., to improve reliability and selective effect

Active Publication Date: 2019-08-27
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the high-speed EMU transmission mode is AC-DC-AC electric drive, and its harmonic characteristics are mainly high-order harmonics, and the harmonic content is very low, which cannot be extracted as a protection criterion.
As a result, the current blocking of the 2nd harmonic current or the comprehensive harmonic suppression of the 2nd, 3rd, and 5th harmonics as the criterion for distinguishing the load current from the short-circuit current is no longer applicable.
It is no longer possible to distinguish between the maximum load current and the short-circuit current of the power supply arm through the relay protection device of the traction substation through the comprehensive harmonic suppression criterion. Incidents frequently occur on some busy trunk lines

Method used

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  • A high-speed railway power supply network system and its protection method
  • A high-speed railway power supply network system and its protection method
  • A high-speed railway power supply network system and its protection method

Examples

Experimental program
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Embodiment 1

[0046] refer to figure 1 As shown, the embodiment of the present invention provides a high-speed railway power supply network system, including at least two traction substations, an autotransformer AT sub-station set between two adjacent traction substations, and a traction substation and the AT station between the AT substation, and the upper and lower traction network power supply arms connecting the traction substation, the AT station and the AT substation, and the traction substation is provided with an uplink feeder circuit breaker 1DL and a downlink feeder The circuit breaker 2DL, the upstream feeder circuit breaker 1DL and the downstream feeder circuit breaker 2DL are respectively equipped with: a first impedance protection device for identifying the metallic grounding short circuit of the power supply network system and cutting off the power supply of the traction substation, for identifying the power supply network System overcurrent and cut off the first overcurrent ...

Embodiment 2

[0068] refer to Figure 5 with Image 6 As shown, the embodiment of the present invention provides a high-speed railway power supply network protection method, including:

[0069] Execute the steps of judging whether the measured value of the first impedance protection of the traction substation is less than the preset setting value of section L1:

[0070] When the measured value of the first impedance protection is less than the preset setting value of the L1 section, the first impedance protection acts to cut off the power supply of the traction substation;

[0071]When the measured value of the first impedance protection is greater than or equal to the preset setting value of the L1 section, perform the steps of judging whether the first impedance protection measurement value is less than the preset setting value of the L2 section:

[0072] When the measured value of the first impedance protection is less than the preset setting value of the L2 section, the first impedanc...

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Abstract

The invention discloses a high-speed railroad power supply network system. The system comprises at least two traction substations, an autotransformer (AT) partition post arranged between the two adjacent traction substations, AT posts arranged between the traction substations and the AT partition post and ascending and descending traction network power supply arms connected with the traction substations, the AT posts and the AT partition post, and an ascending feeder breaker 1DL and a descending feeder breaker 2DL of the traction substations are provided with a first impedance protection device and a first overcurrent protection device respectively; each AT post is provided with 2 autotransformers and a disconnector 1GK used for connecting the 2 autotransformers in parallel, two feeder breakers 3DL and 5DL or 4DL and 6DL in parallel on the incoming side of each autotransformer are provided with a second impedance protection device and a second overcurrent protection device respectively, and electric sections are arranged between the contact points of each 2 feeder breakers connected with the corresponding autotransformer and the ascending and descending traction network power supply arms.

Description

technical field [0001] The invention relates to a high-speed railway power supply network system and a protection method thereof. Background technique [0002] At present, in my country's high-speed railway power supply network, the traction substation provides independent feeder circuit breakers for the uplink and downlink feeders, and the uplink and downlink feeders of the AT station each have a circuit breaker, and two autotransformers are set up as backups for each other, which is realized in the AT station The upper and lower traction network power supply arms are connected in parallel. Four feeder circuit breakers and four autotransformers are set up in the AT partition, and the parallel connection and cross-region functions of the upper and lower traction network power supply arms of both sides of the power supply arm are realized in the AT partition. [0003] However, as my country's high-speed railways are interconnected into the network, the passenger traffic is gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60M3/00H02H7/26H02H3/08
Inventor 张华志吕文利温建民黄军车锐坚
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP