Detection system and detection method for single-phase grounding fault line selection in small current grounding system

A single-phase grounding fault, small current grounding technology, applied in the fault location and other directions, can solve the problems of high line selection accuracy and low line selection accuracy, and achieve the effect of simple configuration, convenient operation, and improved line selection accuracy.

Inactive Publication Date: 2012-06-27
北京天能继保电力科技有限公司
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Problems solved by technology

[0005] The present invention adopts the line selection technology based on fault zero-sequence steady-state quantity and transient quantity for single-phase ground fault line selection in the existing small-current grounding system, because the zero-sequence current characteristic quantity is not obvious before and after the fault and is affected by the parameters of the power syste

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  • Detection system and detection method for single-phase grounding fault line selection in small current grounding system
  • Detection system and detection method for single-phase grounding fault line selection in small current grounding system
  • Detection system and detection method for single-phase grounding fault line selection in small current grounding system

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[0032] The present invention will be described below in conjunction with the accompanying drawings.

[0033] The invention discloses a detection system for single-phase grounding fault line selection in a small current grounding system. The structure of the system is as follows: figure 1As shown, it includes a load switching device and a small current grounding line selection device. The load switching device includes a load, a switching switch, a controller and a sampling device. The load and the switching switch are connected in series and parallel to the arc suppression coil. The control connected to the switching switch and the sampling device respectively. The sampling device is set on the bus to sample the voltage on the bus and transmit the sampled data to the controller. The controller detects the single-phase grounding by detecting the change of the bus voltage The fault occurs and the switching switch is controlled so that the load is switched in a short time, thereb...

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Abstract

The invention relates to a detection system and a detection method for single-phase grounding fault line selection in a small current grounding system. The system comprises a load switching device and a small current grounding line selection device, the load switching device comprises a load, a switching switch, a controller and a sampling device, the load is connected with the switching switch in series and further connected with an arc suppression coil in parallel, and the controller is respectively connected with the switching switch and the sampling device; the small current grounding line selection device is connected with each circuit in the small current grounding system, and the small current grounding line selection device is further connected with the controller in the load switching device. The system and the method can effectively solve the problem of difficulty in line selection of single-phase grounding fault in the small current grounding system, and improve the accuracy of line selection.

Description

technical field [0001] The invention relates to the technical field of power system power distribution, in particular to a detection system and method for one-way grounding fault line selection in a small current grounding system in which a neutral point is grounded through an arc suppressing coil in a 6-66KV distribution network. The system and method can be widely used in power supply systems of power plants, substations and large-scale factories and mines as line and busbar single-phase ground fault alarms or as single-phase ground fault protection trips. Background technique [0002] There are two types of neutral point grounding methods in my country's power system, namely, the neutral point direct grounding method and the neutral point non-direct grounding method. The 110KV and above power grid adopts the neutral point direct grounding method. In this system, when a single-phase ground fault occurs, the short-circuit current is very large, so it is called a large curre...

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Application Information

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IPC IPC(8): G01R31/08
Inventor 姜海涛徐文温彦军刘海波麻生衣余法
Owner 北京天能继保电力科技有限公司
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