CN110687371A - Method and system for determining lightning shielding failure performance of same-tower multi-circuit line - Google Patents
Method and system for determining lightning shielding failure performance of same-tower multi-circuit line Download PDFInfo
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Abstract
The invention discloses a method and a system for determining lightning shielding failure performance of a same-tower multi-circuit line, and belongs to the technical field of high voltage. The method comprises the following steps: carrying out a gap discharge test on the same-tower multi-circuit line to obtain typical electrode test data, fitting the test data, and obtaining the impact distance and the ground impact distance of the same-tower multi-circuit line; acquiring exposed arc sections corresponding to the cross arm leads and the ground wires of each layer of the same-tower multi-circuit line and the projection lengths of the exposed arc sections on the lightning incidence vertical plane according to the attack distance and the earth attack distance of the same-tower multi-circuit line; and acquiring the shielding failure flashover rate of each circuit of the same-tower multi-circuit, and determining the lightning shielding failure performance of the same-tower multi-circuit according to the shielding failure flashover rate. The method can perform simulation calculation on the lightning shielding failure trip-out rate of each circuit in the same-tower multi-circuit transmission line, and provides theoretical support for evaluating and optimizing the lightning protection design of the same-tower multi-circuit transmission line.
Description
Technical Field
The present invention relates to the field of high voltage technology, and more particularly, to a method and system for determining lightning shielding performance of a same tower multiple circuit line.
Background
The design and construction of the same-tower multi-circuit transmission line are important means for improving the unit transmission capacity of the line corridor and effectively saving land resources occupied by the line corridor. The 750kV same-tower 4-circuit transmission line can increase the transmission capacity of a line corridor of a power grid unit in northwest regions of China, save line corridors and engineering investment, and is particularly an optimal scheme for solving the line channel problem in regions with particularly tight corridors. However, the compact design of the 750kV same-tower 4-circuit transmission line only leads the aspects of lightning performance and the like of the transmission line to be changed to a certain extent compared with the conventional 750kV line. For example, according to the operation statistics and simulation research results of 500/220kV and 220/110kV same-tower multi-circuit lines in China, the ground wire protection angle has obvious influence on the shielding failure flashover rate of the adjacent upper-layer cross arm line, and has almost no influence on the shielding failure trip rate of the far-away lower-layer cross arm line. In addition, the tower height and the clearance of the 750kV same-tower 4-circuit transmission line pole are large, the existing EGM model and the existing parameters are not suitable for calculating the shielding failure tripping rate of the 750kV same-tower 4-circuit transmission line, and the relevant parameters need to be corrected according to the large-size characteristic of the model.
Disclosure of Invention
The invention provides a method for determining the lightning shielding performance of a same-tower multi-circuit line, aiming at the problems, and the method comprises the following steps:
carrying out a gap discharge test on the same-tower multi-circuit line to obtain typical electrode test data, fitting the test data, and obtaining the impact distance and the ground impact distance of the same-tower multi-circuit line;
acquiring exposed arc sections corresponding to the cross arm leads and the ground wires of each layer of the same-tower multi-circuit line and the projection lengths of the exposed arc sections on the lightning incidence vertical plane according to the attack distance and the earth attack distance of the same-tower multi-circuit line;
and according to the projection length, acquiring the shielding failure flashover rate of each circuit of the same-tower multi-circuit, and determining the lightning shielding failure performance of the same-tower multi-circuit according to the shielding failure flashover rate.
Optionally, the test data comprises: rod-rod gap discharge data and rod-plate gap discharge data.
Optionally, the attack distance and the ground attack distance of the tower multi-circuit line are obtained, specifically:
determining the gap discharge characteristic of the same-tower multi-circuit line, wherein the formula is as follows:
d＝1.12U50 1.63(1)
wherein, U50The lightning impulse is the impulse voltage value when the breakdown probability is 50 percent under the action of lightning impulse;
determining the head potential VS and the striking-back current amplitude I of the lightning down pilotPThe relationship between the following formulas:
VS＝3.7IP 0.66(2)
according to formulae 1 and 2, rs，VS＝U50 1.63；
The distance of impact is obtained, and the distance of impact,
the formula is as follows:
rs＝9.45IP 1.08(3)
the earth strike distance is obtained according to equation 3, which is as follows:
rsg＝n×rs(4)
wherein n is the earth distance coefficient, and n is more than 1.
Optionally, the shielding failure flashover rate of each circuit of the same tower multi-circuit is obtained, specifically:
the differential expression of the circuit shielding failure times of unit length is obtained according to the projection length of the exposed arc section on the vertical plane of lightning incidence, and further the circuit shielding failure flashover rate n is obtained, wherein the formula is as follows:
Ngis the density of the ground lightning, X is the projection length of the exposed arc section on the vertical plane of incidence of the lightning, f (I) is the probability density function of the amplitude of the lightning current, IcCritical lightning current and I for causing flashover of wiremaxThe maximum lightning current that can cause a lightning flashover around the lightning rod.
The invention also proposes a system for determining the lightning shielding performance of a same-tower multi-circuit line, the system comprising:
the first parameter acquisition module is used for carrying out a gap discharge test on the same-tower multi-circuit line to acquire typical electrode test data, fitting the test data and acquiring the impact distance and the ground impact distance of the same-tower multi-circuit line;
the second parameter acquisition module is used for acquiring the exposed arc sections corresponding to the cross arm leads and the ground wires of each layer of the same-tower multi-circuit line and the projection lengths of the exposed arc sections on the lightning incident vertical plane according to the attack distance and the earth attack distance of the same-tower multi-circuit line;
and the third parameter acquisition module is used for acquiring the shielding failure flashover rate of each circuit of the same-tower multi-circuit according to the projection length and determining the lightning shielding failure performance of the same-tower multi-circuit according to the shielding failure flashover rate.
Optionally, the test data comprises: rod-rod gap discharge data and rod-plate gap discharge data.
Optionally, the first parameter obtaining module is configured to:
determining the gap discharge characteristic of the same-tower multi-circuit line, wherein the formula is as follows:
d＝1.12U50 1.63
wherein, U50The lightning impulse is the impulse voltage value when the breakdown probability is 50 percent under the action of lightning impulse;
determining the head potential VS and the striking-back current amplitude I of the lightning down pilotPThe relationship between the following formulas:
VS＝3.7IP 0.66
according to formulae 1 and 2, rs，VS＝U50 1.63；
Obtaining the hit distance, wherein the formula is as follows:
rs＝9.45IP 1.08
the earth strike distance is obtained according to equation 3, which is as follows:
rsg＝n×rs
wherein n is the earth distance coefficient, and n is more than 1.
Optionally, the third parameter obtaining module is configured to:
the differential expression of the circuit shielding failure times of unit length is obtained according to the projection length of the exposed arc section on the vertical plane of lightning incidence, and further the circuit shielding failure flashover rate n is obtained, wherein the formula is as follows:
Ngis the density of the ground lightning, X is the projection length of the exposed arc section on the vertical plane of incidence of the lightning, f (I) is the probability density function of the amplitude of the lightning current, IcCritical lightning current and I for causing flashover of wiremaxThe maximum lightning current that can cause a lightning flashover around the lightning rod.
The method can perform simulation calculation on the lightning shielding failure trip-out rate of each circuit in the same-tower multi-circuit transmission line, and provides theoretical support for evaluating and optimizing the lightning protection design of the same-tower multi-circuit transmission line.
Drawings
FIG. 1 is a graph of gap discharge characteristics for a method of determining lightning shielding performance of a same tower multiple circuit line in accordance with the present invention;
FIG. 2 is a schematic diagram of an EGM electrical geometry model for determining lightning shielding performance of a same tower multi-circuit line according to the method of the present invention;
FIG. 3 is a schematic illustration of the exposed arc segment and projection of a method of the present invention for determining the lightning shielding performance of multiple circuits on the same tower;
FIG. 4 is a flow chart of a method for determining lightning shielding performance of multiple circuits on the same tower in accordance with the present invention;
FIG. 5 is a block diagram of a system for determining the lightning strike performance of multiple circuits on the same tower in accordance with the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for determining the lightning shielding performance of a same-tower multi-circuit line, which is shown in fig. 4 and comprises the following steps:
carry out the clearance discharge test to many circuit on the same tower, obtain typical electrode test data, test data includes: rod-rod gap discharge data and rod-plate gap discharge data; fitting the test data to obtain the hitting distance and the ground hitting distance of the same tower and multiple circuits;
the method comprises the following steps of obtaining the hitting distance and the ground hitting distance of a tower multi-circuit line, specifically:
determining the gap discharge characteristic of the same-tower multi-circuit line, wherein the formula is as follows:
d＝1.12U50 1.63
wherein, U50The lightning impulse is the impulse voltage value when the breakdown probability is 50 percent under the action of lightning impulse;
the same tower multi-circuit line gap discharge characteristic curve is shown in fig. 1:
determining the head potential VS and the striking-back current amplitude I of the lightning down pilotPThe relationship between the following formulas:
VS＝3.7IP 0.66
according to the same-tower multi-circuit line gap discharge characteristic formula and the lightning down pilot head potential VS and the striking-back current amplitude IPThe relation between d and rs，VS＝U50 1.63The formula is as follows:
rs＝9.45IP 1.08
and obtaining the earth strike distance according to a strike distance formula, wherein the formula is as follows:
rsg＝n×rs
wherein n is the earth distance coefficient, and n is more than 1.
According to the attack distance and the ground attack distance of the same-tower multi-circuit line, the projection lengths of the exposed arc sections and the exposed arc sections corresponding to the cross arm leads and the ground wires of each layer of the same-tower multi-circuit line on the lightning incidence vertical plane are obtained based on an EGM model, and the projection lengths of the exposed arc sections and the exposed arc sections on the lightning incidence vertical plane are shown in FIG. 3;
the EGM is a lightning shielding calculation method provided according to the geometric structure of the power transmission line;
in EGM, it is assumed that before the distance between the leading head portion, which is developed from thundercloud to the ground, and the object to be struck reaches a certain critical breakdown distance (i.e., strike distance), the strike point is uncertain, and which object is reached within the strike distance first, i.e., the object is discharged.
As shown in FIG. 2, the lightning strike distances of the ground and the conducting wire are rs and r, respectivelysg(ii) a Arc segments B' A and AB are respectively lightning-arrestingLine S and conductor C as the center of a circle, with the striking distance r of the conductorsIs a circular arc line with a radius; BD is a distance of attack r parallel to the ground and at a height of the groundsgIs measured.
In the figure, the arc section AB is an exposed arc section of the power transmission line, and a lightning strike positioned on the arc section AB can hit a lead. A. The accurate positioning of the two points B is very important for calculating the performance of the line lightning shielding. It can be seen from the figure that: A. the geometric positions of the two points B are mainly determined by the lightning strike distances (r) of the conducting wire and the ground wires) Distance between lightning and earth (r)sg) And (6) determining.
Meanwhile, the incidence angle (ψ) of the pilot near the ground is random, and the pilot incidence angle probability density distribution function is:
calculating the projection distance of the unit exposure arc on the ground according to the following formula:
upper and lower limits theta of integral in the formula1And theta2As shown in FIG. 2, the range ψ of the pilot incidence angle can be determined from θ 11、ψ2。
Because the distance between the ground wire and the lower-layer cross arm wire is far, the shielding protection effect of the upper-layer wire on the lower-layer wire is considered in the calculation. Therefore, the exposed arc sections corresponding to the cross arm wires of each layer of the 750kV same-tower 4 return transmission line and the projection length X of the exposed arc sections on the lightning incidence vertical plane need to be calculated in an overall consideration.
And acquiring the shielding failure flashover rate of each circuit of the same-tower multi-circuit, and determining the lightning shielding failure performance of the same-tower multi-circuit according to the shielding failure flashover rate.
The method for acquiring the shielding failure flashover rate of each circuit of the same tower multi-circuit comprises the following steps:
the differential expression of the circuit shielding failure times of unit length is obtained according to the projection length of the exposed arc section on the vertical plane of lightning incidence, and further the circuit shielding failure flashover rate n is obtained, wherein the formula is as follows:
Ngis the density of the ground lightning, X is the projection length of the exposed arc section on the vertical plane of incidence of the lightning, f (I) is the probability density function of the amplitude of the lightning current, IcCritical lightning current and I for causing flashover of wiremaxThe maximum lightning current that can cause a lightning flashover around the lightning rod.
The present invention also proposes a system 200 for determining lightning shielding performance of multiple lines on the same tower, as shown in fig. 5, comprising:
the first parameter obtaining module 201 performs a gap discharge test on the same tower multi-circuit line to obtain typical electrode test data, which includes: rod-rod gap discharge data and rod-plate gap discharge data; fitting the test data to obtain the hitting distance and the ground hitting distance of the same tower and multiple circuits;
the method comprises the following steps of obtaining the hitting distance and the ground hitting distance of a tower multi-circuit line, specifically:
determining the gap discharge characteristic of the same-tower multi-circuit line, wherein the formula is as follows:
d＝1.12U50 1.63
wherein, U50The lightning impulse is the impulse voltage value when the breakdown probability is 50 percent under the action of lightning impulse;
determining the head potential VS and the striking-back current amplitude I of the lightning down pilotPThe relationship between the following formulas:
VS＝3.7IP 0.66
according to the same-tower multi-circuit line gap discharge characteristic formula and the lightning down pilot head potential VS and the striking-back current amplitude IPThe relation between d and rs，VS＝U50 1.63And acquiring a stroke distance, wherein the formula is as follows:
rs＝9.45IP 1.08
according to a distance attack formula, obtaining the earth distance attack, wherein the formula is as follows:
rsg＝n×rs
wherein n is the earth distance coefficient, and n is more than 1.
The second parameter obtaining module 202 is used for obtaining exposed arc sections corresponding to cross arm leads and ground wires of each layer of the same-tower multi-circuit line and projection lengths of the exposed arc sections on a lightning incidence vertical plane according to the attack distance and the earth attack distance of the same-tower multi-circuit line;
and the third parameter obtaining module 203 is used for obtaining the shielding failure flashover rate of each circuit of the same-tower multi-circuit line according to the projection length, and determining the lightning shielding failure performance of the same-tower multi-circuit line according to the shielding failure flashover rate.
The method for acquiring the shielding failure flashover rate of each circuit of the same tower multi-circuit comprises the following steps:
the differential expression of the circuit shielding failure times of unit length is obtained according to the projection length of the exposed arc section on the vertical plane of lightning incidence, and further the circuit shielding failure flashover rate n is obtained, wherein the formula is as follows:
Ngis the density of the ground lightning, X is the projection length of the exposed arc section on the vertical plane of incidence of the lightning, f (I) is the probability density function of the amplitude of the lightning current, IcCritical lightning current and I for causing flashover of wiremaxThe maximum lightning current that can cause a lightning flashover around the lightning rod.
The method can perform simulation calculation on the lightning shielding failure trip-out rate of each circuit in the same-tower multi-circuit transmission line, and provides theoretical support for evaluating and optimizing the lightning protection design of the same-tower multi-circuit transmission line.
The invention provides a stroke distance formula, a ground stroke distance coefficient and a line shielding failure trip rate calculation method which are suitable for 750kV same-tower 4-circuit transmission lines and are based on an Electrical Geometric Model (EGM) method by combining the research results of related long-gap high-voltage discharge tests in China.
Claims (8)
1. A method for determining lightning shielding performance of a same tower multi-circuit line, the method comprising:
carrying out a gap discharge test on the same-tower multi-circuit line to obtain typical electrode test data, fitting the test data, and obtaining the impact distance and the ground impact distance of the same-tower multi-circuit line;
acquiring exposed arc sections corresponding to the cross arm leads and the ground wires of each layer of the same-tower multi-circuit line and the projection lengths of the exposed arc sections on the lightning incidence vertical plane according to the attack distance and the earth attack distance of the same-tower multi-circuit line;
and according to the projection length, acquiring the shielding failure flashover rate of each circuit of the same-tower multi-circuit, and determining the lightning shielding failure performance of the same-tower multi-circuit according to the shielding failure flashover rate.
2. The method of claim 1, wherein said test data comprises: rod-rod gap discharge data and rod-plate gap discharge data.
3. The method according to claim 1, wherein the step of obtaining the hit distance and the ground hit distance of the tower multi-circuit line comprises:
determining the gap discharge characteristic of the same-tower multi-circuit line, wherein the formula is as follows:
d＝1.12U50 1.63(1)
wherein, U50The lightning impulse is the impulse voltage value when the breakdown probability is 50 percent under the action of lightning impulse;
determining the head potential VS and the striking-back current amplitude I of the lightning down pilotPThe relationship between the following formulas:
VS＝3.7IP 0.66(2)
according to formulae 1 and 2, rs，VS＝U50 1.63；
Obtaining the hit distance, wherein the formula is as follows:
rs＝9.45IP 1.08(3)
the earth strike distance is obtained according to equation 3, which is as follows:
rsg＝n×rs(4)
wherein n is the earth distance coefficient, and n is more than 1.
4. The method according to claim 1, wherein the obtaining of the flashover rate of the circuit around each circuit of the same tower multi-circuit line comprises:
the differential expression of the circuit shielding failure times of unit length is obtained according to the projection length of the exposed arc section on the vertical plane of lightning incidence, and further the circuit shielding failure flashover rate n is obtained, wherein the formula is as follows:
Ngis the density of the ground lightning, X is the projection length of the exposed arc section on the vertical plane of incidence of the lightning, f (I) is the probability density function of the amplitude of the lightning current, IcCritical lightning current and I for causing flashover of wiremaxThe maximum lightning current that can cause a lightning flashover around the lightning rod.
5. A system for determining lightning shielding performance of a same tower multi-circuit line, the system comprising:
the first parameter acquisition module is used for carrying out a gap discharge test on the same-tower multi-circuit line to acquire typical electrode test data, fitting the test data and acquiring the impact distance and the ground impact distance of the same-tower multi-circuit line;
the second parameter acquisition module is used for acquiring the exposed arc sections corresponding to the cross arm leads and the ground wires of each layer of the same-tower multi-circuit line and the projection lengths of the exposed arc sections on the lightning incident vertical plane according to the attack distance and the earth attack distance of the same-tower multi-circuit line;
and the third parameter acquisition module is used for acquiring the shielding failure flashover rate of each circuit of the same-tower multi-circuit according to the projection length and determining the lightning shielding failure performance of the same-tower multi-circuit according to the shielding failure flashover rate.
6. The system of claim 5, wherein said test data comprises: rod-rod gap discharge data and rod-plate gap discharge data.
7. The system of claim 5, a first parameter acquisition module to
Determining the gap discharge characteristic of the same-tower multi-circuit line, wherein the formula is as follows:
d＝1.12U50 1.63
wherein, U50The lightning impulse is the impulse voltage value when the breakdown probability is 50 percent under the action of lightning impulse;
determining the head potential VS and the striking-back current amplitude I of the lightning down pilotPThe relationship between the following formulas:
VS＝3.7IP 0.66
according to formulae 1 and 2, rs，VS＝U50 1.63；
Obtaining the hit distance, wherein the formula is as follows:
rs＝9.45IP 1.08
the earth strike distance is obtained according to equation 3, which is as follows:
rsg＝n×rs
wherein n is the earth distance coefficient, and n is more than 1.
8. The system of claim 5, a third parameter acquisition module to
The differential expression of the circuit shielding failure times of unit length is obtained according to the projection length of the exposed arc section on the vertical plane of lightning incidence, and further the circuit shielding failure flashover rate n is obtained, wherein the formula is as follows:
Ngis the density of the ground lightning, X is the projection length of the exposed arc section on the vertical plane of incidence of the lightning, f (I) is the probability density function of the amplitude of the lightning current, IcCritical lightning current and I for causing flashover of wiremaxThe maximum lightning current that can cause a lightning flashover around the lightning rod.
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