Pollution-flashover-caused trip probability calculation method of overhead lines in sand and dust environment

A technology for overhead lines and sand and dust environments, applied in computing, instrumentation, electrical digital data processing, etc., can solve problems such as small sample capacity of grid-related statistical data, inability to accurately assess the impact of pollution flashover tripping probability of air lines, and impact on prediction accuracy, etc.

Inactive Publication Date: 2015-10-21
HARBIN INST OF TECH +4
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Problems solved by technology

The existing technology has the following problems: (1), the existing calculation method for the failure probability of overhead lines under extreme weather relies on the historical fault statistics data of the power grid to predict the failure rate, and the sample size of the power grid related statistical data is small, which affects the prediction accuracy
(2) The existing model fails to establish the specific quantitative relationship between the pollution fla

Method used

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  • Pollution-flashover-caused trip probability calculation method of overhead lines in sand and dust environment
  • Pollution-flashover-caused trip probability calculation method of overhead lines in sand and dust environment
  • Pollution-flashover-caused trip probability calculation method of overhead lines in sand and dust environment

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Embodiment 1

[0076] The criterion for the adsorption of sand and dust particles on the insulating surface: when the exit velocity V y3 When there is no real number solution, the sand and dust particles settle, and the exit velocity is as formula (1):

[0077] V y 3 = ( e V y 0 ) 2 - 2 W a m - - - ( 18 )

[0078] In the formula, e is the restitution coefficient; V y0 is the normal velocity of pollution particles incident on the surface of the insulator; W a The work done by the dirty particles to overcom...

Embodiment 2

[0144] Taking the 500kV transmission line from the north of Baotou to the east of Hohhot in the central and western part of Inner Mongolia under the strong sandstorm environment of 8:00-14:00 on March 19, 2010 as an example, the pollution flashover trip probability of the transmission line was analyzed. The single-circuit erection of this line has a length of 155.35km. According to the "Technical Regulations for Design of 110kV-500kV Overhead Power Transmission Lines", the insulator model is XWP2-160, the suspension double operation, the number of insulators in series is 32 pieces, the span is 650 meters, the design wind speed is 28m / s, when the sandstorm wind speed is less than this value Only the impact of dust storm on the probability of line pollution flashover faults is considered and its mechanical impact on transmission lines is not considered. The parameters of the monolithic XWP2-160 type insulator are A=7.255, α=0.219, K=4.79, i=0.34, j=0.13.

[0145] The meteorolog...

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Abstract

The invention provides a pollution-flashover-caused trip probability calculation method of overhead lines in a sand and dust environment. The method comprises: based on sandstorm weather information, building a deposit model of sand and dust particles on an overhead line insulator surface and calculates equivalent salt deposit density and equivalent dust deposit density on the insulator surface; by taking into account the feature that a dust-to-salt ratio in a sandstorm-prone area is high, building a transmission line pollution-flashover-caused trip probability model which comprehensively considers salt density and dust density on the insulator surface; combining relative studies on insulator probability statistics and line reliability theories, and assessing a overhead line pollution-flashover-caused trip risk in the sand and dust environment; and then, on the basis of relative humidity influence on insulator flashover leakage current, building a line pollution-flashover-caused trip model in wet weather after sandstorms, and assessing influence of relative humidity changes on the overhead line pollution-flashover-caused trip probability. According to the invention, possible overhead line trip faults are prevented, and a safe and stable operational level of a grid in sand and dust environment is improved.

Description

technical field [0001] The invention relates to a calculation method for the pollution flashover trip probability of an overhead line in a dusty environment. Background technique [0002] The pollution flashover of transmission line insulators under the influence of sandstorms is determined by two factors. One is the pollution deposition on the surface of insulators caused by sand and dust particles in the atmosphere; the other is the meteorological conditions that can fully absorb the accumulated pollutants. The existing technology has the following problems: (1). The existing calculation method for the failure probability of overhead lines under extreme weather relies on the historical failure statistics data of the power grid to predict the failure rate. The sample size of the power grid related statistical data is small, which affects the prediction accuracy. (2) The existing model fails to establish the specific quantitative relationship between the pollution flashover ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 任学哲周苏荃张伟徐泰山
Owner HARBIN INST OF TECH
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