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Distribution network protection method based on distribution network "three lines of defense"

A technology of three lines of defense and zero-sequence protection, which is applied to emergency protection circuit devices, circuit devices, electrical components, etc., and can solve problems such as large investment and failure to receive expected results

Active Publication Date: 2020-01-10
ZAOZHUANG POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology

Distribution automation is important, but if its extension is over-extended, it will also cause excessive investment and fail to achieve the expected results

Method used

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  • Distribution network protection method based on distribution network "three lines of defense"
  • Distribution network protection method based on distribution network "three lines of defense"
  • Distribution network protection method based on distribution network "three lines of defense"

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] 1 "Three lines of defense for distribution network"

[0030] The protection based on the local sampling volume is a traditional protection configuration, but it has its important and unique existence value as a link and a demarcation point connecting the automatic distribution system and the safe and reliable operation of the system. Therefore, the correct action of the protection device not only It can improve the space for distribution network automation downwards, and it can also provide a reliable line of defense for the system side upwards. Judging from the current protection configuration, we can start from three levels. With the effective resolution of these three key issues, it can play its due role.

[0031] 1. The circuit breaker at the outlet of the substation adopts three-stage overcurrent protection. The protection of overcurrent s...

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Abstract

The invention discloses a distribution network protection method based on three defense lines of a distribution network. An overhead line or a cable is provided with a boundary switch at a responsibility boundary point, and the boundary switch is grounded via an arc suppression coil. The distribution network protection method comprises that a substation outlet circuit breaker adopts three-phase overcurrent protection; the substation outlet circuit breaker protection adopts a twice reclosing mode; and setting is performed on zero-sequence protection of the distribution network boundary switch by using a boundary switch zero-sequence protection setting principle. The distribution network protection method provides a new method of distribution network three defense lines and a layered structure and a layer-to-layer relation thereof in allusion to a fact that great importance is attached to distribution network automation in construction of a first-class distribution network and problems at other levels are neglected, and points out that the objective of improving the reliability of the distribution network can be realized by hierarchically solving the organic whole in layer-by-layer progressive manner. On the basis, an interlayer pivot function is proposed especially, three important starting points are provided, a new boundary switch zero-sequence current protection setting method is put forward finally, and the power supply reliability is improved.

Description

technical field [0001] The invention relates to the technical field of distribution network protection, in particular to a distribution network protection method based on the "three lines of defense" of the distribution network. Background technique [0002] In order to strengthen the construction of "first-class distribution network" and improve the reliability of power supply, power supply companies at all levels are vigorously promoting the construction of distribution automation. The construction of distribution network is a comprehensive problem, while the timely isolation and recovery of distribution network faults is a multi-level problem. Only when each level solves its own level of problems, and then strengthens inter-level coordination, can problems be solved efficiently and quickly. On the contrary, if the problems that originally belonged to this level are handed over to other levels to solve, not only is the efficiency not high, but it will also treat the sympt...

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Application Information

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IPC IPC(8): H02H7/28H02J13/00
CPCH02H7/28H02J13/0006
Inventor 林霞李强揭一鸣李可田凤字时永石磊王思萌韩松孔令元廉震冯相军王祥军刘朋万卫东种法超胡太元王龙李崭崔岩王婷婷张琳朱新颖张英彬王群薛会张立卓江海旗高常德王抒阅李扬王金凤于华陈珊孟庆红
Owner ZAOZHUANG POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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