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Method for positioning single-phase grounding failure of distribution network containing distributed power supply

A single-phase ground fault, distributed power technology, applied in the fault location and other directions, can solve the problems of inapplicable distribution network with distributed power, less involved in fault feeder section selection technology, increase equipment cost, etc., to achieve high reliability , the effect of saving equipment costs and improving positioning accuracy

Inactive Publication Date: 2011-11-23
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0004] At present, there are many studies on single-phase ground fault location in small-current grounding systems, but most of the methods focus on the level of fault line selection, seldom involve the selection technology of fault feeders, and are not suitable for distributed power distribution systems. power grid
In addition, most positioning methods need to install additional fault line selection equipment in the power system, which will introduce harmonics on the one hand, and increase the cost of equipment on the other hand

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  • Method for positioning single-phase grounding failure of distribution network containing distributed power supply
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  • Method for positioning single-phase grounding failure of distribution network containing distributed power supply

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] use figure 1 The shown 10kV distribution network structure, this embodiment includes the following steps:

[0032] In the first step, the distribution network is divided into 18 sections. Among them, S0, S2, S4, and S8 are bus sections to be protected, S1, S3, S7, S9, S10, S12, S13, S15, and S16 are line sections to be protected, and S17 is a transformer section to be protected . Since monitoring points need to be installed at the endpoints of the protected section, it can be seen that S0, S1, S2, S3, S4, S7, S8, S9, S10, S12, S13, S15, S16, and S17 are fully enclosed sections, and S5, S6 , S11, S14, and S18 are semi-closed sections.

[0033] The second step is to install a single-phase voltage transformer at the low-voltage side bus S0 of the substation; install zero-sequence current transformers and zero-seq...

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Abstract

The invention provides a method for positioning a single-phase grounding failure of a distribution network containing a distributed power supply, and the method can be used for dividing the distribution network into sections and constructing a distribution network failure positioning software and hardware system. When the distribution network is determined to have a permanent grounding failure, a failure positioning program is executed, and data is collected step by step to realize failure phase section, failure wire selection and failure section selection. Failures can be positioned accurately step by step, so that the method is higher in reliability and accuracy, is in accordance with automatic construction of the distribution network, can be used for saving the equipment cost and the data storage space of a master station, is high in positioning speed, and is suitable for the traditional distribution network and the distribution network containing the distributed power supply.

Description

Technical field: [0001] The invention relates to a method for detecting faults, in particular to a method for locating single-phase grounding faults in a distribution network with distributed power sources. Background technique: [0002] In my country, the distribution network with a voltage level of 35kV and below belongs to the small current grounding system. In addition, one of the development trends of the power grid - the access of distributed power sources, has changed the original power flow distribution and has had a significant impact on the structure and operation of the distribution network. [0003] In the distribution network, single-phase ground faults account for 70%-80% of the total line faults. For the small current grounding system, when a single-phase grounding fault occurs, the fault current is very small, causing little harm to equipment and people, and the line voltage between the three phases remains basically unchanged, which does not affect the powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 李雅洁孟晓丽盛万兴宋晓辉史常凯李建芳贾东梨张瑜仉天舒
Owner CHINA ELECTRIC POWER RES INST
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