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Node interlocking protection method suitable for multiple power supply modes

A technology of interlocking protection and nodes, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as no systematic solutions

Active Publication Date: 2020-06-02
NARI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For the above-mentioned multi-power supply situations, there is currently no systematic solution, which brings new challenges to primary system design, functional design and setting of relay protection

Method used

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  • Node interlocking protection method suitable for multiple power supply modes
  • Node interlocking protection method suitable for multiple power supply modes
  • Node interlocking protection method suitable for multiple power supply modes

Examples

Experimental program
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Embodiment Construction

[0077] Attached below Figure 10 The AC medium-voltage power supply system for urban rail transit specifically analyzes and explains in detail the various protection action behaviors of the present invention at various fault points under various power supply modes.

[0078] It is assumed here that the longitudinal difference protection of the optical fiber at both ends of the line between the two stations is not working or not set.

[0079] 1. Line L BC1 A fault occurs at point k1 in the middle (line fault)

[0080] 1) When there is only single power supply 1

[0081] DL1(C1) fault phase has low voltage and no flow, does not send blocking signal, and sends permission signal to all its adjacent protection DL2(B1), DL2(C1).

[0082] The fault phase current of DL2 (B1) is greater than the "non-directional blocking trip current", and the line L connected to it has not been received. BC1 The non-directional blocking signal sent by the only adjacent protection DL1 (C1) of the no...

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Abstract

The invention discloses a node interlocking protection method suitable for multiple power supply modes. According to the method, adjacent protection of each node is defined by using a node theory. Positive direction pointing of various types of protection is specified, forward and reverse directions of the current are determined through determination of the positive direction, allowable protectionand reverse locking protection are provided, the problem of operation refusal of non-directional locking type protection in a multi-power-supply system is solved, the method is suitable for various power supply modes, interlocking protection of the whole power grid can be achieved only by interlocking protection of the station and protection of opposite ends of incoming and outgoing lines entering and exiting the station, and the implementation and maintenance difficulty of the method is reduced. If optical fiber longitudinal differential protection between lines does not work or is not set,complete protection can still be provided for faults in various power supply modes. When a GOOSE network is adopted to transmit interlocking signals, network grouping can be carried out according to one station in a GOOSE switch, and network anomaly messages possibly caused by one network mode of the whole line are prevented from affecting the whole line.

Description

technical field [0001] The invention relates to a relay protection method for node interlocking, which belongs to the field of protection control. Background technique [0002] In the ring network power supply system, such as the AC medium voltage power supply system of urban rail transit, the longitudinal difference of optical fiber is usually set between the two stations as the main protection, and the definite time overcurrent protection is set as the backup protection according to the ladder principle. The combination of the two constitutes Complete protection. Due to the requirements of the maximum allowable time limit for the main substation that supplies power to urban rail transit, the number of definite-time overcurrent protection stages set according to the ladder principle cannot be too many to ensure that the time limit will not exceed the requirements of the main substation. [0003] Relay protection manufacturers have adopted some methods, typically sending bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H7/28H02H7/22
CPCH02H7/26H02H7/28H02H7/261H02H7/22
Inventor 李钢吴永文朱微维
Owner NARI TECH CO LTD
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