Small current grounding route selection method

A technology of small current grounding and line selection method, which is applied to electrical components, emergency protection circuit devices, fault locations, etc., can solve the problems of low line selection accuracy, poor adaptability, and low line selection accuracy rate, etc. The line resolution effect is obvious, the hardware cost is saved, and the judgment accuracy is improved.

Inactive Publication Date: 2010-07-14
HANGZHOU DELIXI GROUP
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Benefits of technology

This technology helps detect if there's any damage or other problems with an electrical power distribution network by providing it with more accurate data about its condition before being damaged due to external factors such as lightning strikes or equipment failure during operation.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency with which small-scale electrical lines are selected for use during power distribution systems due to their complex structure that makes it difficult or impossible to apply different methods based on specific situations such as faults.

Method used

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  • Small current grounding route selection method
  • Small current grounding route selection method
  • Small current grounding route selection method

Examples

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Embodiment

[0051] The specific equipment of the substation includes: 8 10kv transmission lines, 2 35kv incoming lines, 8 CDMP200 protection measurement devices, 1 CDMP281 voltage measurement and control device; Advantech industrial computer (CPU P42.8G, memory 512M, hard disk 120G, Win2000Server, Hangzhou Delixi CD-SCADA power station monitoring system).

[0052] refer to figure 2 , small current grounding line selection method, including:

[0053] 1) Configure the system settings of the substation sequentially from top to bottom. Parameter setting: This method needs to introduce the zero-sequence voltage signal of each busbar (PT open triangle voltage 3U0) and the zero-sequence current 3I0 of each outgoing line. Correctly define the grounding line selection starting condition of the zero-sequence voltage 3U0, set the starting threshold setting value, set the line selection starting voltage and the threshold value of the bus grounding alarm voltage (the default value is 30V) and the c...

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Abstract

The invention relates to a small current grounding route selection system, in particular to the improvement of a grounding fault route judgment method, which belongs to the technical field of electric power engineering. The method comprises the following steps: 1) setting the sampling data window time of measuring variables 3U0 and 3I0, collecting n measuring variables, and carrying out gross error removal on each measuring variable; 2) organically combines a group amplitude comparison and phase comparison method and a watt component method, and utilizing a fuzzy mathematical tool for setting membership grade functions for two criteria, substituting route selection results obtained by the two methods into the membership grade functions to obtain the membership grade of the route selection results, i.e. the credibility, wherein the route selection result with the highest membership grade is the composite route selection result, and the second highest membership grade is used as the reference; 3) organically carrying out trial jump on the route selection of a fault route switch for reaching the effect that the operation is more safe and reliable, and the fault positioning is more accurate; and 4) carrying out route selection again every ten minutes for preventing the grounding route conversion. Grounding time, routs (sequentially ranged from the large possibility to the small possibility) with large grounding possibility and 3U0 and 3I0 values of all outlet wires on a bus line section with the occurrence of small current grounding are displayed in an information frame.

Description

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Claims

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Application Information

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Owner HANGZHOU DELIXI GROUP
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