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Region backup protection method capable of being used for setting and simplifying distance II section protection

A back-up protection and distance technology, applied to emergency protection circuit devices, electrical components, etc., can solve the problems of difficulty in calculating the minimum branch coefficient, failure to meet the requirements of quick action, and long operation time, so as to simplify the setting work and reduce the difficulty of setting , the effect of reducing the workload

Inactive Publication Date: 2014-07-30
ZHEJIANG UNIV
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Problems solved by technology

By analogy, in some cases, the action time of the second-stage protection is too long to meet the quick action requirements
On the other hand, in order to meet the selectivity requirements, the minimum branching coefficient needs to be calculated when coordinating with adjacent lines. However, when the grid structure is more complex, the calculation of the minimum branching coefficient is more difficult. Finding out the minimum branching coefficient and its corresponding matching line, the workload of setting calculation is very large

Method used

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  • Region backup protection method capable of being used for setting and simplifying distance II section protection
  • Region backup protection method capable of being used for setting and simplifying distance II section protection
  • Region backup protection method capable of being used for setting and simplifying distance II section protection

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing.

[0017] The present invention comprises the following steps:

[0018] Step 1. Calculate the setting value of the distance section II of the protected line; specifically: the setting value of the distance section II K sen is the sensitivity coefficient, take 1.2, Z l is the impedance value of the protected line; the action time from section II is t II =Δt, Δt is a time step.

[0019] Step 2. Collect the start-up information of the impedance element in the distance protection of the adjacent substation when the fault occurs; specifically: the start-up information of the protection distance section II on this side The starting information of the lower protection distance segment III Opposite side protection distance stage II start information Back side protection distance segment III start information

[0020] Step 3. Calculate the result of the area protection cri...

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Abstract

The invention relates to a region backup protection method capable of being used for setting and simplifying distance II section protection. An existing distance II section protection setting method has large calculating amount and calculating difficulty. By means of the region backup protection method, according to the resistance value of a protected line, the setting value of distance II section protection is calculated only according to sensitivity requirements. Then, starting information of distance protection of an adjacent transformer substation is collected. Afterwards, a region backup protection criterion result is calculated. Finally, a protection action is determined according to the criterion result so as to correctly eliminate faults. The region backup protection method reduces setting difficulty of distance II section protection, reduces workloads, and improves quickness of distance II section protection.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a regional backup protection method which can be used to simplify the protection setting of the distance II section. Background technique [0002] With the rapid development of the economy, the scale of the power grid continues to expand, and the structure and operation of the power grid become increasingly complex. As a result, it becomes more and more difficult to set the value of the traditional backup protection. more. On the other hand, the development of the power grid has higher and higher requirements for the correct action of the backup protection. Therefore, research on improving the performance of backup protection is urgent. [0003] In recent years, relay protection researchers have focused their research on wide-area protection, hoping to improve the performance of backup protection through the introduction of wide-area information. The...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 王慧芳陈梦骁何奔腾
Owner ZHEJIANG UNIV
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