Lighting flashover risk evaluation model and method of regional transmission line

A risk assessment model and transmission line technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that the shielding trip rate is not the same physical quantity, etc.

Active Publication Date: 2011-08-17
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID +2
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Problems solved by technology

[0031] Compared with the calculation of shielding risk by the procedure method, the improved electrical geometric model has made great progress, but the result calculated by this geometric model is the probability of tripping caused by shielding, as shown in formula (12), which is different from the calculation by the procedure method The result of the shielding trip rate is not the same physical quantity

Method used

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  • Lighting flashover risk evaluation model and method of regional transmission line
  • Lighting flashover risk evaluation model and method of regional transmission line
  • Lighting flashover risk evaluation model and method of regional transmission line

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Embodiment 1

[0115] The lightning flashover risk assessment model of the regional power transmission line of the present invention, such as figure 2 shown, including:

[0116] The database is used to store lightning parameters, tower parameters, topography parameters, line parameters and the value of each parameter;

[0117] The shielding risk assessment model is used to use the parameters in the database to obtain the probability P of tripping caused by shielding of each tower by using the improved electrical geometric model algorithm b , and then calculate the shielding tripping rate N of each tower 1 , P b and N 1 The calculation formulas are respectively:

[0118] P b = ∫ I SC I SM P ( I ) X c - X ...

Embodiment 2

[0132] The lightning resistance level is the key to tripping or not, and its level is directly related to the calculation result of the tripping rate. The potential difference between the top of the tower and the wire hanger and the difference in the tower type directly affect the lightning resistance level of the counterattack. The first embodiment, the regulation method, ignores the influence of these two factors on the lightning resistance level of the counterattack, resulting in inaccurate calculation of the counterattack tripping rate. The counterattack risk assessment model of this embodiment takes the above two factors into consideration. First, the calculation formula of the counterattack lightning resistance level is revised. Secondly, for different tower types, the two parameters in the counterattack lightning resistance level formula take different values.

[0133] The regulation method mentions that the voltage acting on the top of the tower is:

[0134] ...

Embodiment 3

[0161] The lightning parameters stored in the database include ground flash density. The lightning parameters used in Embodiment 1 and Embodiment 2 are obtained from the monitoring data of the Meteorological Department. Due to the influence of human factors, these monitoring data are not accurate enough. This embodiment adds a lightning parameter sorting module, such as Image 6 As shown, the module inputs lightning data from the lightning location system, and calculates the lightning density N of the area to be evaluated after sorting out the input lightning data s , and then the ground flash density N s Stored in the database as lightning parameters.

[0162] The lightning location system is a monitoring system developed in the mid-1970s based on the principles of magnetic field location and time difference location to record lightning strike data. It can measure the number, time, location, amplitude and polarity of lightning strikes and return strikes in real time. The li...

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Abstract

The invention discloses a lighting flashover risk evaluation model of a regional transmission line, comprising a database, a shielding failure risk evaluation model, a counterattack risk evaluation model and a risk value integrating module, wherein the database is used for providing various parameters and values of the various parameters; the shielding failure risk evaluation model is mainly usedfor solving a shielding failure trip-out rate by means of an improved electrogeometric model; the counterattack risk evaluation model is used for calculating a counterattack trip-out rate by means ofa standard method; and the risk value integrating module is used for adding the shielding failure trip-out rate to the counterattack trip-out rate to obtain the total lightning trip-out rate. The model provided by the invention integrates the advantages of an electrogeometric geometrical model and a standard method, uses the data of a lightning location system, considers the impacts of the form of a pole tower to the counterattack lightning resisting level, and improves the accuracy of lighting flashover risk evaluation of the regional transmission line. The invention also discloses a lighting flashover risk evaluation method of a regional transmission line corresponding to the model, wherein the model is combined with the method, and therefore, the lighting flashover risk evaluation can be carried out.

Description

technical field [0001] The invention relates to the technical field of lightning risk assessment for transmission lines, in particular to a lightning flashover risk assessment model and method for regional transmission lines. Background technique [0002] Lightning strike is one of the main causes of transmission line faults. The transmission line does not necessarily trip when it is struck by lightning. Only when the magnitude of the lightning current exceeds the lightning withstand level, will there be a flashover or trip. Once tripped, it will have serious impacts. Therefore, the assessment of lightning flashover risk or the calculation of lightning tripping rate is beneficial to the operation and maintenance of transmission lines, and is convenient for various lightning protection designs. [0003] According to the different objects of lightning strikes, lightning strikes can be divided into counterattack and shielding strikes. The lightning strike object of counteratta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张鸣刘刚唐军李恒真肖智刚谢志成杜远祥何卓阳高云鹏张建利梁富清曾能先张栋周万杰曾昭贵邢明程东华
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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