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Double-ended line differential protection system and method

A double-ended line and differential protection technology, applied in emergency protection circuit devices, information technology support systems, circuit devices, etc., can solve problems such as waste of optical fiber resources, and achieve the effect of fast and stable delay characteristics

Active Publication Date: 2018-11-13
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a double-ended line protection system and method to solve the problem of a large waste of optical fiber resources caused by the differential protection of double-ended lines

Method used

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  • Double-ended line differential protection system and method
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  • Double-ended line differential protection system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0044] see figure 1 , this embodiment provides a double-ended line differential protection system, the double-ended line includes: a first substation 1 with a first bus 2 and a first circuit breaker 3, several sets of a second bus 8 and The second substation 7 of the second circuit breaker 9, and the transmission line 5 connected between the first substation 1 and the second substation 7, the system includes: a protection master 4, a protection slave 10, an optical line terminal 11, optical network unit 12 and optical fiber 6;

[0045] The protection host 4 and the optical line terminal 11 are set in the first substation 1;

[0046] The protection slave 10 and the optical network unit 12 are arranged in the second substation 7;

[0047] The protection host 4 is connected to the optical fiber 6 through the optical line terminal 11;

[0048] The protection slave 10 is connected to the optical fiber 6 through the optical network unit 12;

[0049] The optical fiber 6 is compos...

Embodiment 2

[0057] see figure 2 , this embodiment provides another double-ended line differential protection system, the optical line terminal 11 is built in the protection master 4; the optical network unit 12 is built in the protection slave 10; the double-ended line provided by this embodiment For other structures of the differential protection system, refer to the double-terminal line differential protection system provided in Embodiment 1, which will not be repeated here.

[0058] It can be known from the above technical solutions that the present invention provides a double-ended line differential protection system. The double-ended line includes: a main substation 1 provided with a first bus 2 and a first circuit breaker 3, a slave substation 7 provided with a second bus 8 and a second circuit breaker 9, and connected to the main substation 2 and The power transmission line 5 between the slave substations 7, the system includes: a protection host 4, a protection slave 10, an opti...

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Abstract

The invention discloses a differential protection system and method for a double-end line. The double-end line comprises a first substation, a second substation and a power transmission line connected between the first substation and the second substation. The differential protection system comprises a protection master computer, a protection slave computer, an optical line terminal, an optical network unit and an optical fiber, wherein the protection master computer and the optical line terminal are arranged in the first substation; the protection slave computer and the optical network unit are arranged in the second substation; the protection master computer is connected with the optical fiber through the optical line terminal; the protection slave computer is connected with the optical fiber through the optical network unit; and the optical fiber is composed of a fiber core. The differential protection system can also transmit MMS packets on the basis of ensuring the synchronization performance and quick and reliable transmission of SMV and GOOSE packets by using only one fiber core, realizes remote configuration and information calling of equipment, and can save fiber core resources of the optical fiber.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a double-terminal line differential protection system and method. Background technique [0002] Due to its inherent phase selection ability, load avoidance ability and anti-oscillation ability, line split-phase current differential protection is more reliable, sensitive, fast and selective than line longitudinal distance protection and longitudinal direction protection. It is excellent, and its criterion has nothing to do with voltage, so it is widely used in high-voltage lines. The 220kV and above lines of China Southern Power Grid even use line split-phase current differential protection as the two sets of main protection. [0003] At present, the phase-splitting current differential protection of lines usually uses multiplexing channels or dedicated optical fibers as communication channels. When the multiplexing channel is used, the protection d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J13/00
CPCH02H7/26H02J13/00019Y02B90/20Y04S40/124
Inventor 刘柱揆曹敏胡凡君董涛许守东
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST