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Method for locating a short circuit in an electrical grid comprising at least one line section

A technology for wire segments and power grids, applied in the direction of measuring electricity, fault location, measuring electrical variables, etc., can solve problems such as error-prone, outdated, troublesome power grid

Active Publication Date: 2016-10-26
SIEMENS MOBILITY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manual calculations are error prone and outdated
Furthermore, the conventional generation of distance-reactance curves by local multiple measurement of short-circuit reactance values ​​or by cost-intensive simulations is cumbersome and error-prone for the grid operator

Method used

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  • Method for locating a short circuit in an electrical grid comprising at least one line section
  • Method for locating a short circuit in an electrical grid comprising at least one line section
  • Method for locating a short circuit in an electrical grid comprising at least one line section

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Embodiment Construction

[0032] figure 1A diagram of the distance reactance curve 1 for the positive feeder and the distance reactance curve 2 for the negative feeder of a network of an autotransformer system is shown. The relationship between the short-circuit reactance X of the grid and the position in the grid is drawn. Each distance-reactance curve 1 or 2 has a plurality of segments 3 , which each correspond to a line segment of the network and which each show the distance-reactance curve for the corresponding line segment. Distance-reactance curves 1 and 2 are considered separately below in order to explain an example configuration of the method according to the invention.

[0033] figure 2 shown in figure 1 Illustration of the distance-reactance curve 1 for the positive feeder of the grid for the autotransformer system shown in . The distance-reactance curve 1 is divided corresponding to the individual conductor segments or sections 3 . Each segment 3 represents the course of the distance-...

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Abstract

The invention relates to a method for locating a short circuit in an electrical grid comprising at least one line section, in particular of an autotransformer system, said method having the following steps: - detecting section-specific parameters of the line section; - deriving at least one mathematical function from the section-specific parameters of the line section, wherein the mathematical function represents a short-circuit reactance of the line section as a function of a location within the line section; and - deducing the location of the short circuit within the line section from the mathematical function and a short-circuit reactance value determined with respect to the short circuit.

Description

technical field [0001] The invention relates to a method for locating a short circuit in an electrical network comprising at least one conductor segment. [0002] Furthermore, the invention relates to a device for locating a short circuit in a network comprising at least one conductor section, in particular in a network of an autotransformer system. Background technique [0003] For operators of power grids, for example energy companies or railway utilities, it is of increasing importance to quickly locate and determine short circuits in a running power grid. For this purpose, distance protection relays are usually used, which can locate the short circuit on the basis of the measured short-circuit reactance. The respective measured short-circuit reactance and the respective short-circuit distance determined therefrom, ie the respective location at which the short-circuit occurred, can be provided by the distance protective relay in the form of electronic information to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor R.比安奇
Owner SIEMENS MOBILITY GMBH
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