CN105608269B - A method for estimating ray length of 500kV transmission line tower grounding body - Google Patents

A method for estimating ray length of 500kV transmission line tower grounding body Download PDF

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CN105608269B
CN105608269B CN201510960102.2A CN201510960102A CN105608269B CN 105608269 B CN105608269 B CN 105608269B CN 201510960102 A CN201510960102 A CN 201510960102A CN 105608269 B CN105608269 B CN 105608269B
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grounding body
ray
tower
length
grounding
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曹晓斌
马御棠
周仿荣
于虹
王科
杜俊乐
高竹清
马仪
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Electric Power Research Institute of Yunnan Power System Ltd
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Abstract

A kind of 500kV electric power line pole tower grounding body ray length evaluation method disclosed by the invention, comprising: establish tower grounding body Model；The impulse earthed resistance of tower grounding body Model is calculated according to model；The formula of the impulse earthed resistance of the Fitting Calculation tower grounding body；According to the formula of the impulse earthed resistance, it is fitted the effective length formula of tower grounding body ray；The effective length of tower grounding body ray is obtained according to actual soil resistivity；Wherein: the ground connection body Model includes four steel bodies and the tower grounding body ray being arranged in the steel body, and four steel bodies form the square that side length is 18m, and the adjacent tower grounding body ray is not total to endpoint.A kind of 500kV electric power line pole tower grounding body ray length evaluation method provided by the invention, provides theoretical foundation for the design and transformation of electric power line pole tower earthing or grounding means, helps to obtain more excellent grounding body.

Description

A kind of 500kV electric power line pole tower grounding body ray length evaluation method
Technical field
The present invention relates to electrical distribution fields, more specifically, are related to a kind of 500kV electric power line pole tower grounding body and penetrate Line length evaluation method.
Background technique
In recent years, many areas in China recur because lightning stroke caused by large area short circuit power cut, reason be mostly by Caused by the impulse earthed resistance of electric power line pole tower grounding body is excessively high.Electric power line pole tower grounding body is protection electric system Safe and reliable operation, the important measures for protecting personnel safety nearby, tower grounding device diffusing is bad to cause impulse resistance excessive It is the main reason for causing transmission line lightning stroke to trip.
Recent domestic scholar has carried out a large amount of research for the impulse earthed resistance of earthing or grounding means, proposes various drops Resistance measure, discovery, which extends horizontal grounding pole and increases ground connection number of poles, can reduce impulse earthed resistance, but grounding body reaches one After fixed length, continuing to extend grounding body its drop resistance effect of optimization can decline, while there is also same grounding body in difference Regional using effect it is different, cause earthing material to waste sometimes, and technical requirements are not achieved in grounding body sometimes Effect.
It is those skilled in the art's urgent problem to be solved as it can be seen that how to provide more excellent grounding body.
Summary of the invention
The object of the present invention is to provide a kind of 500kV electric power line pole tower grounding body ray length evaluation methods, for transmission of electricity The design and transformation of overhead line structures earthing or grounding means provide theoretical foundation, help to obtain more excellent grounding body.
In order to solve the above technical problem, the present invention provides following technical solutions:
A kind of 500kV electric power line pole tower grounding body ray length evaluation method provided by the invention, the length of the ray Spending calculation method includes:
Establish tower grounding body Model；
The impulse earthed resistance of tower grounding body Model is calculated according to model；
The formula of the impulse earthed resistance of the Fitting Calculation tower grounding body；
According to the formula of the impulse earthed resistance, it is fitted the effective length formula of tower grounding body ray；
The effective length of tower grounding body ray is obtained according to actual soil resistivity；
Wherein: the ground connection body Model includes four steel bodies and the tower grounding body ray being arranged in the steel body, The square that four steel bodies composition side length is 18m, the adjacent tower grounding body ray are not total to endpoint.
Preferably, described to be calculated according to model in above-mentioned 500kV electric power line pole tower grounding body ray length evaluation method The impulse earthed resistance of tower grounding body Model, fitting obtain the formula of the impulse earthed resistance of tower grounding body
R=1.1+0.009 ρ+(0.02 ρ -0.97) ebl (l≥0)
Wherein: R is impulse earthed resistance, and ρ is soil resistivity, and e is natural constant,
Preferably, described according to the impact in above-mentioned 500kV electric power line pole tower grounding body ray length evaluation method The formula of ground resistance is fitted the effective length formula of tower grounding body ray, specifically includes:
Impulse earthed resistance is to the ground connection body length derivation, it is assumed that
α=5 ° are obtained, the effective length l for obtaining electric power line pole tower junctor ray is fitted according to αe,
Wherein: α is to meet the tangent line of the formula requirement point and the angle of horizontal direction on R-curve.
Preferably, in above-mentioned 500kV electric power line pole tower grounding body ray length evaluation method, when ρ is less than or equal to 100 When Ω m, le≈0m。
Preferably, in above-mentioned 500kV electric power line pole tower grounding body ray length evaluation method, the electric wire line pole tower is connect The effective length l of body raye, when ρ is greater than 100 Ω m, the effective length l of electric power line pole tower junctor raye,
Preferably, in above-mentioned 500kV electric power line pole tower grounding body ray length evaluation method, the method also includes: According to the effective length formula of tower grounding body ray, the effective length of tower grounding body ray is obtained according to soil resistivity；
According to the effective length of the tower grounding body ray, impulse earthed resistance R is calculated；
Compare design requirement impulse earthed resistance R0With the size of R,
Work as R0When < R, grounding body ray length leIt is unsatisfactory for design requirement；Otherwise meet design requirement.
Preferably, in above-mentioned 500kV electric power line pole tower grounding body ray length evaluation method, the steel body be band steel or Round steel.
500kV electric power line pole tower grounding body ray length evaluation method provided by the invention, provides one kind and is used for The excellent ground connection body Model of 500kV electric power line pole tower, while a kind of method for estimating grounding body ray length is provided, it helps In the effective use effective diffusing length of grounding body, while avoiding unnecessary waste of material.It can utmostly be connect using shaft tower The steel of ground device, and theoretical foundation is provided for the design and transformation of electric power line pole tower earthing or grounding means, help to provide excellent Good electric power line pole tower earthing or grounding means.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described, it should be apparent that, for those of ordinary skills, do not making the creative labor Under the premise of property, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is grounding body model schematic provided in an embodiment of the present invention；
Fig. 2 is impulse earthed resistance provided in an embodiment of the present invention and tower grounding body ray length relationship change figure；
Fig. 3 is the effective length and soil resistivity relational graph of tower grounding body ray provided in an embodiment of the present invention.
Specific embodiment
A kind of 500kV electric power line pole tower grounding body ray length evaluation method provided in an embodiment of the present invention, for transmission of electricity The design and transformation of overhead line structures earthing or grounding means provide theoretical foundation, help to obtain more excellent grounding body.
Technical solution in embodiment in order to enable those skilled in the art to better understand the present invention, and make of the invention real The above objects, features, and advantages for applying example can be more obvious and easy to understand, with reference to the accompanying drawing to the technology in the embodiment of the present invention Scheme is described in further detail.
A kind of 500kV electric power line pole tower grounding body ray length evaluation method provided in an embodiment of the present invention, it is main to wrap It includes:
Establish tower grounding body Model.
The ground connection body Model includes four steel bodies and the tower grounding body ray being arranged in the steel body, and described four Root steel body forms the square that side length is 18m, and the adjacent tower grounding body ray is not total to endpoint, that is, forms windmill and penetrate Line, with reference to attached drawing 1, the figure shows the structures and shape of ground connection body Model provided in an embodiment of the present invention.Being grounded body Model can It is made using band steel or round steel.Preferably, the cross-sectional width of band steel is greater than 40 millimeters, and thickness is greater than or equal to 5 millimeters； Or, round steel diameter is greater than 10 millimeters when using round steel.
The impulse earthed resistance of tower grounding body Model is calculated according to model.
For obtain tower grounding body Model impulse earthed resistance, to 500kV electric power line pole tower grounding body ray length, Relationship between soil resistivity and impulse earthed resistance three is analyzed, and a kind of analysis side is provided in the embodiment of the present invention Method establishes CDEGS shaft tower simulation analysis model, and when grounding body uses round steel in model, round steel diameter is greater than 10 millimeters.In model In by changing the length of soil resistivity and grounding body ray length, calculate separately the impulse earthed resistance for obtaining shaft tower.
Such as, in CDEGS software, respectively change ray length be 0m, 3m, 6m, 12m, 18m, 32m, 46m, 57m, 79m, And soil resistivity be respectively set as 100 Ω m, 200 Ω m, 300 Ω m, 400 Ω m, 500 Ω m, 800 Ω m, 1000 Ω m, 1500 Ω m, 2000 Ω m, 2500 Ω m, 3000 Ω m obtain impulse grounding electricity by simulation calculation Resistance distribution is as shown in Fig. 2.
With reference to attached drawing 2, analysis can be obtained no matter under which kind of soil resistivity, and the impulse resistance of earthing or grounding means is all with ray The increase of length and reduce, and reach there is after certain length saturation trend.Therefore, when ray reaches certain length, after For the long ray length that renews substantially without resistance reducing effect, we are defined as the length effective length of tower grounding device.
To curve in attached drawing 2 be fitted to obtain 500kV tower grounding body impulse earthed resistance and soil resistivity and The relational expression of ray length are as follows:
The formula of the impulse earthed resistance of the Fitting Calculation tower grounding body: R=1.1+0.009 ρ+(0.02 ρ -0.97) ebl (l >=0), in which: R is impulse earthed resistance, and ρ is soil resistivity, and e is natural constant,
According to the formula of the impulse earthed resistance, it is fitted the effective length formula of tower grounding body ray.
Using IEEE TRANSACTIONS ON POWER DELIVERY the 2nd phase in 2005 document " Effective Length of Counterpoise Wire Under Lightning Current " provide method: impulse grounding will be met Earthing pole length when resistance is less than a certain specified value to the derivative of ground connection body length is defined as the effective length of earthing pole, it may be assumed thatIn formula, α is to meet the tangent line of the formula requirement point and the angle of horizontal direction on curve.When α=5 °, after Renew long ray length, and impulse earthed resistance varies less, it is believed that ray reaches its effective length at this time.
With reference to attached drawing 3, fitting obtains the effective length l of electric wire line pole tower junctor raye,
When soil resistivity is 100 Ω m, the effective length l of tower grounding body rayeOnly 1.89m, i.e., when ρ= When 100 Ω m, le=1.89m so can choose when soil resistivity is less than 100 Ω m, there is tower grounding body ray Effective length leCan be approximately considered is 0m, i.e., as the Ω m of ρ≤100, le≈0m。
The effective length of tower grounding body ray is obtained according to actual soil resistivity.
The soil resistivity of acquisition is substituted into above-mentioned formula, obtains the effective of shaft tower grounding body ray under this soil resistivity Length le。
In this way, after the effective length for obtaining tower grounding body ray, it can also having according to this tower grounding body ray Effect length carries out judging whether this effective length meets design needs.By the effective length for the tower grounding body ray being calculated Wait enterR value is sought, by itself and design requirement or requirements R0Into Row is relatively (design requirement or requirements be R0).Work as R0When < R, grounding body ray length leIt is unsatisfactory for design requirement；Otherwise meet Design requirement.
As R0 > R, grounding body ray length leWhen meeting design requirement, the grounding body ray length l which uses exists Effective length l is taken in conservative designe；It can be calculate by the following formula to obtain from material l is saved:
As R0 < R, impulse earthed resistance can not be effectively reduced in the ray length for extending shaft tower grounding body at this time, therefore L takes effective length le, at this time using by increasing other measure drop resistances such as amount of radiation.
500kV electric power line pole tower grounding body ray length evaluation method provided by the invention, provides one kind and is used for The excellent ground connection body Model of 500kV electric power line pole tower, while a kind of method for estimating grounding body ray length is provided, it helps In the effective use effective diffusing length of grounding body, while avoiding unnecessary waste of material.It can utmostly be connect using shaft tower The steel of ground device, and theoretical foundation is provided for the design and transformation of electric power line pole tower earthing or grounding means, help to provide excellent Good electric power line pole tower earthing or grounding means.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment Dividing may refer to each other, and the highlights of each of the examples are differences from other embodiments.
The embodiments of the present invention described above are not intended to limit the scope of the present invention.It is any in the present invention Spirit and principle within made modifications, equivalent substitutions and improvements etc., should all be included in the protection scope of the present invention.

Claims (5)

1.一种500kV输电线路杆塔接地体射线长度估算方法，其特征在于，所述射线的长度计算方法包括：1. a 500kV transmission line tower grounding body ray length estimation method, is characterized in that, the length calculation method of described ray comprises: 建立杆塔接地体模型；Build a tower grounding body model; 根据模型计算杆塔接地体模型的冲击接地电阻；Calculate the impact grounding resistance of the tower grounding body model according to the model; 拟合计算杆塔接地体的冲击接地电阻的公式；The formula for fitting and calculating the impact grounding resistance of the tower grounding body; 根据所述冲击接地电阻的公式，拟合杆塔接地体射线的有效长度公式；According to the formula of the impact grounding resistance, fit the effective length formula of the tower grounding body ray; 根据实际的土壤电阻率获得杆塔接地体射线的有效长度；Obtain the effective length of the grounding body ray of the tower according to the actual soil resistivity; 其中：所述接地体模型包括四根钢体以及设置在所述钢体上的杆塔接地体射线，所述四根钢体组成边长为18m的正方形，相邻的所述杆塔接地体射线不共端点；Wherein: the grounding body model includes four steel bodies and tower grounding body rays arranged on the steel bodies, the four steel bodies form a square with a side length of 18m, and the adjacent grounding body rays of the tower are not common endpoint; 其中，所述根据模型计算杆塔接地体模型的冲击接地电阻，拟合得到杆塔接地体的冲击接地电阻的公式Wherein, according to the calculation of the impact grounding resistance of the tower grounding body model according to the model, the formula of the impact grounding resistance of the tower grounding body is obtained by fitting R＝1.1+0.009ρ+(0.02ρ-0.97).ebl，l≥0R=1.1+0.009ρ+(0.02ρ-0.97).e bl , l≥0 其中：R为冲击接地电阻，ρ为土壤电阻率，l为杆塔接地体射线长度，e为自然常数， Among them: R is the impact grounding resistance, ρ is the soil resistivity, l is the ray length of the tower grounding body, e is the natural constant, 所述方法还包括：依据杆塔接地体射线的有效长度公式，根据土壤电阻率获得杆塔接地体射线的有效长度；The method further includes: obtaining the effective length of the grounding body ray of the tower according to the soil resistivity according to the effective length formula of the grounding body ray of the tower; 根据所述杆塔接地体射线的有效长度，计算冲击接地电阻R；Calculate the impact grounding resistance R according to the effective length of the grounding body ray of the tower; 比较设计要求冲击接地电阻R0与R的大小，Comparing the design requirements of the impact grounding resistance R 0 and R, 当R0＜R时，输电线路杆塔接地体射线的有效长度le不满足设计要求；否则满足设计要求。When R 0 <R, the effective length le of the grounding body ray of the transmission line tower does not meet the design requirements; otherwise, it meets the design requirements. 2.根据权利要求1所述的500kV输电线路杆塔接地体射线长度估算方法，其特征在于，所述根据所述冲击接地电阻的公式，拟合杆塔接地体射线的有效长度公式，具体包括：2. 500kV transmission line tower grounding body ray length estimation method according to claim 1, is characterized in that, described according to the formula of described impact grounding resistance, fit the effective length formula of tower grounding body ray, specifically comprises: 冲击接地电阻对所述接地体射线长度求导，假设The impulse grounding resistance is derived from the length of the grounding body ray, assuming 获得α＝5°,根据α拟合获得输电线路杆塔接地体射线的有效长度le， Obtain α=5°, and obtain the effective length le of the grounding body ray of the transmission line tower according to α fitting , 其中：α为R曲线上满足该公式要求点的切线与水平方向的夹角。Where: α is the angle between the tangent of the point on the R curve that meets the requirements of the formula and the horizontal direction. 3.根据权利要求2所述的500kV输电线路杆塔接地体射线长度估算方法，其特征在于，当ρ小于或等于100Ω·m时，le≈0m。3 . The method for estimating the ray length of the grounding body of a 500kV transmission line tower according to claim 2 , wherein, when ρ is less than or equal to 100Ω·m, le ≈ 0m . 4.根据权利要求2所述的500kV输电线路杆塔接地体射线长度估算方法，其特征在于，所述输电线路杆塔接地体射线的有效长度le，当ρ大于100Ω·m时，输电线路杆塔接地体射线的有效长度le， 4. The method for estimating the ray length of the grounding body ray of a 500kV transmission line tower according to claim 2, characterized in that, when the effective length l e of the grounding body ray of the transmission line tower is greater than 100Ω·m, the transmission line tower is grounded the effective length of the body ray, le , 5.根据权利要求1所述的500kV输电线路杆塔接地体射线长度估算方法，其特征在于，所述钢体为扁钢或圆钢。5 . The method for estimating the ray length of the grounding body of a 500kV transmission line tower according to claim 1 , wherein the steel body is a flat steel or a round steel. 6 .
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CN106093589B (en) * 2016-08-09 2018-09-18 国网重庆市电力公司南岸供电分公司 A kind of pole tower ground resistance Accurate measurement and device
CN111880010B (en) * 2020-08-10 2021-11-09 西南交通大学 Method for detecting impact effective length of grounding electrode of power transmission line tower

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