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Sectional detection method of small current earthing fault of power system

A low-current grounding and power system technology, applied in the fault location and other directions, can solve the problems of application limitation and insufficient precision, and achieve the effects of large amplitude, wide application and high reliability.

Inactive Publication Date: 2003-06-04
SHANDONG KEHUI POWER AUTOMATION
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Problems solved by technology

However, the accuracy of this method is not high enough and the application is limited

Method used

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  • Sectional detection method of small current earthing fault of power system
  • Sectional detection method of small current earthing fault of power system
  • Sectional detection method of small current earthing fault of power system

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Embodiment Construction

[0046] If the whole set of detection system is made up of special devices during concrete realization, it will inevitably cause waste of equipment and funds. Therefore, an optimal implementation plan is: share the software and hardware platform with the feeder automation system or the railway signal power monitoring system, use FTU and RTU as the line detection device, and share the master station and communication system, only need to add corresponding software and a small amount of hardware. Can.

[0047] attached Figure 1-4 It is an embodiment of the present invention, and the structure and working process of the system will be described below.

[0048] Such as figure 1 As shown, the whole detection system consists of three parts: feeder automation remote terminals FTU1-FTU6 distributed at each detection point of the line, substation terminal equipment RTU as the line detection device, located in the main station of the substation, and contacting the communication betwee...

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Abstract

The sectional detection method of small current earthing fault of power system, especially single phase long distance system, is suitable for system with several detection units in different sectionsof the line. Each unit variance in zero-sequence voltage or current is used as fault starting condition, the transient zero-sequence current amplitude and initial polarity are calculated, and the main station determines the fault section based on the fault information the detectors report. The basic criterion is that the transient zero-sequence currents on two sides of the fault point have opposite polarity and that each transient zero-sequence current amplitude is proportional inversely to the distance to the fault point. The said method is suitable for system with unearthed neutral point, earthed arc extinguishing coil or high earthing resistance as well as system with reactive load.

Description

technical field [0001] The invention relates to a small-current ground fault segmentation method in a power system, which relates to a single-phase ground fault segmentation method of a medium-voltage distribution network in which the neutral point is not grounded, the arc suppressing coil is grounded, or the high-impedance grounding is used, and it particularly relates to a single-outlet long-distance Small current grounding system, such as single-phase grounding fault segmentation method of railway signal power supply system (self-closing or through line). Background technique [0002] Most of my country's power distribution system adopts neutral point ungrounded or resonant grounded (arc suppression coil grounded) treatment. Due to the small fault current and the instability of the grounding process caused by arc light, single-phase ground fault detection has always been a problem that is difficult to solve completely. [0003] Most of the f...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 徐丙垠薛永端冯祖仁王敬华王俊江
Owner SHANDONG KEHUI POWER AUTOMATION
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