System and method for positioning medium voltage distribution network using power line carrier communication

A technology of power line carrier and positioning system, applied in the direction of information technology support system, fault location, etc., can solve the problems affecting the reliability and accuracy of the selection principle, difficulty in practical application, signal distortion, etc., and achieve economical and practical operation cost and real-time performance Good and reliable effect

CN101871988AInactive Publication Date: 2010-10-27上海市南供电设计有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2010-10-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a system and a method for positioning a medium voltage distribution network using power line carrier communication. The system comprises a plurality of nodes, and each node has number and fault information; and the system also comprises a carrier communication network connected with the nodes and a host controlling and processing system connected with the carrier communication network. The method comprises the following steps of: inputting, acquiring, judging whether a zero sequence voltage is greater than a threshold value, judging whether a fault exists and whether the fault is a false grounding fault, judging a neutral point grounding mode and positioning fault points by adopting different methods for positioning fault zones. The system uses the power line carrier communication technology as main means of fault information transmission and distribution network communication, has the advantages of economy, practicability, strong adaptability, simple channel maintenance and high reliability, has openness and compatibility, can be used as a common channel by each distributed automatic subsystem, meets various demands of distribution network management, greatly reduces the investment, and accurately positions the fault points through least square.
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Description

technical field

[0001] The invention relates to a medium-voltage distribution network positioning system and method, in particular to a medium-voltage distribution network positioning system and method using power line carrier communication. technical background

[0002] The medium-voltage distribution network mostly has mixed lines of overhead lines and cables, as well as branch lines. The network structure is complex, and most of the line faults are single-phase ground faults. In the small current grounding operation mode, due to the weak current of single-phase ground fault (commonly known as small current ground fault), the system can run for a period of time after the fault occurs. Therefore, the small current grounding operation mode can significantly improve the reliability of power supply, and also has The advantage of less interference to the same-sex system. But long-term operation with faults, especially when there are intermittent arc-flash ground faults, overvo...

Examples

Embodiment Construction

[0039] The present invention will be further described below in conjunction with accompanying drawing.

[0040] see figure 1 , the figure shows a medium-voltage distribution network positioning system using power line carrier communication, one of the present inventions, including several nodes S set on the medium-voltage distribution network, each node S has a serial number and a The corresponding fault information also includes the carrier communication network 1 connected to the node S and the host control and processing system 2 connected to the carrier communication network 1, wherein:

[0041] Each node S sends the fault information together with the number of the node to the host control and processing system 2 through the carrier communication network 1 after processing the fault information. An online monitoring and measurement module (not shown in the figure) is installed on each node S. The online monitoring and measurement module realizes zero-sequence current mea...