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Optical fiber differential protection reclosing system

A differential protection and reclosing technology, applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve the problems of large investment and no installation of line PT, to simplify the power grid structure and reduce construction costs. Cost, high practical value effect

Active Publication Date: 2017-10-03
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional distribution network line has installed the busbar PT (potential transformer), but has not installed the line PT
If large-scale installation of line PT investment is large

Method used

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  • Optical fiber differential protection reclosing system
  • Optical fiber differential protection reclosing system
  • Optical fiber differential protection reclosing system

Examples

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with drawings and embodiments.

[0018] Such as figure 2 As shown, the busbar PT of the substation is connected to the recloser, and the reclosers of different substations are connected through the optical fiber differential protection device, so that the recloser function does not collect the line voltage, but uses the optical fiber communication channel of the optical fiber differential protection to obtain the corresponding The bus voltage on one side and the state of the circuit breaker on the opposite side are used to realize no-voltage reclosing and synchronous reclosing.

[0019] Realizing the reclosing function only requires a piece of program code in the optical fiber differential protection device, and the overall hardware structure utilizes the hardware structure of the optical fiber differential protection device without changing the hardware.

[0020] The present invention transmits the ...

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Abstract

The present invention provides a reclosing system for optical fiber differential protection, which includes: the busbar PT of each substation is connected to the reclosing switch, the reclosing switches of different substations are connected through optical fiber differential protection devices, and the reclosing switch on this side uses optical fiber differential The optical fiber communication channel of automatic protection can obtain the bus voltage of the opposite side and the state of the circuit breaker of the opposite side to realize non-voltage reclosing and synchronous reclosing. The advantage of the present invention is: based on the existing line optical fiber differential protection facilities, the reclosing logic of the traditional collection line PT is changed to obtain the voltage of the opposite side bus PT and the position of the opposite side circuit breaker to realize the non-voltage reclosing Reclosing with the same period reduces the construction cost of the power grid, simplifies the structure of the power grid, and has high practical value.

Description

technical field [0001] The invention relates to a reclosing system for optical fiber differential protection, which belongs to the technical field of electric power system relay protection. Background technique [0002] Such as figure 1 As shown, the reclosing function adopted by the traditional optical fiber differential protection is as follows: generally one side uses non-voltage reclosing, and the other side only uses synchronous reclosing. [0003] No-voltage reclosing means that when the recloser judges that there is voltage on the bus (collected through the bus PT), there is no voltage on the line (collected through the line PT), and the switch is closed after a short delay. [0004] Synchronous reclosing means that when the reclosing judges that the phase of the line voltage (collected through the line PT) is consistent with the phase of the bus voltage (collected through the bus PT), a reclosing command is issued to close the corresponding switch. [0005] my coun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/06
Inventor 鲍有理史春旻刘志仁董丽金许小兵
Owner STATE GRID CORP OF CHINA
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