CN102957115B - 500kV electric transmission line lightning arrester arranges method - Google Patents

500kV electric transmission line lightning arrester arranges method Download PDF

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CN102957115B
CN102957115B CN201210409313.3A CN201210409313A CN102957115B CN 102957115 B CN102957115 B CN 102957115B CN 201210409313 A CN201210409313 A CN 201210409313A CN 102957115 B CN102957115 B CN 102957115B
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China
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shaft tower
transmission line
risk
lightning
power transmission
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CN102957115A (en
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高志伟
郑宇清
杨杰
刘彦芳
戴建国
刁嘉
王万才
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DATONG ULTRAHIGH PRESSURE ELECTRIC POWER SUPPLY Co OF NORTH CHINA GRID Co Ltd
State Grid Corp of China SGCC
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DATONG ULTRAHIGH PRESSURE ELECTRIC POWER SUPPLY Co OF NORTH CHINA GRID Co Ltd
State Grid Corp of China SGCC
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Abstract

The present invention is specially a kind of 500kV electric transmission line lightning arrester and arranges method, solve lack a kind of have a reliable theoretical foundation and lightning arrester method for arranging efficient, reasonable, economic in practical application.The present invention reduces the scope of calculation of sector by analyzing damage to crops caused by thunder distribution map, calculation stress is determined three, the section of level Four damage to crops caused by thunder grade, have employed advanced reasonably computational methods and distinguish the common shaft tower of different condition and the risk of shielding failure across power transmission line place, mountain valley shaft tower, under the theory support of first two steps, the shaft tower of zinc oxide surge arresters is determined through great many of experiments, taken into account efficiency and economy, the layout for lightning arrester provides the system of selection that a kind of good theory combines practice.

Description

500kV electric transmission line lightning arrester arranges method
Technical field
The present invention relates to the lightning arrester method for arranging of ultra-high-tension power transmission line, be specially a kind of 500kV electric transmission line lightning arrester and arrange method.
Background technology
The operating experience of domestic and international high-tension line shows, shaft tower height is less than 50m, earth resistance is less than transmission line, its counterattack possibility very little, lightning stroke trip is mainly caused by shielding.For the circuit of 500kV, because its insulation level is very high, counterattack lightning withstand level is also very high, and main threat is shielding.
At present, China's back flash-over rate generally adopts regular method to calculate, mainly based on some empirical equations.These empirical equations derive from low voltage grade, lower shaft tower and larger shielding angle circuit, and ground elevation is only distinguished with Plain and mountain region, does not take into full account landform residing for transmission line.Some cross over the circuit of deep valley, and due to wire, overhead distance is very large, and ground reduces greatly in the face of the shielding action of wire, and existing regular method and the unaccountable shielding accident of electric geometry method often occur.Electric geometry method method (EGM) is a kind of geometry computation model discharge characteristic of thunder and lightning and the physical dimension of circuit connected." improved EGM is to the calculating of transmission line risk of shielding failure and Analysis on Typical Faults " in the volume third phase in June the 42nd in 2006 " High-Voltage Electrical Appliances " discloses a kind of computational methods of electric geometry method of improvement.Utilize electric geometry method method (EGM) that the easily section of hitting, the risk of shielding failure suffering thunderbolt shaft tower etc. and back flash-over rate can be calculated.
After compound inslation AC series gap lightning arrester is used for transmission line lightning protection, because lightning arrester only can protect the insulator of this base shaft tower, there is dispute in the installation quantity of lightning arrester always.Some schemes install lightning arrester additional in the shaft tower both sides that may be struck by lightning, and some schemes install comparatively large, that soil resistivity is higher for earth resistance shaft tower additional lightning arrester, and some schemes advocate to install lightning arrester additional completely.But lack a kind of have a reliable theoretical foundation and lightning arrester method for arranging efficient, reasonable, economic in practical application.
Summary of the invention
The present invention in order to solve lack a kind of have a reliable theoretical foundation and lightning arrester method for arranging efficient, reasonable, economic in practical application, provide a kind of 500kV electric transmission line lightning arrester and arrange method.
The present invention adopts following technical scheme to realize: 500kV electric transmission line lightning arrester arranges method, comprises the steps,
(1) the easily section of hitting and the lightning stroke trip reason of transmission line is determined; Be specially and utilize shielding damage to crops caused by thunder distribution map and lightning strike accident statistical analysis over the years, section that is residing three, level Four damage to crops caused by thunder grade is defined as the easily section of hitting, i.e. section to be calculated;
(2) electric geometry method method (EGM) is utilized to calculate the common shaft tower of section to be calculated and the risk of shielding failure across power transmission line place, mountain valley shaft tower, be specially the computational methods factorization utilizing existing electric geometry method method (EGM), program is made up of two parts, Part I is the calculation procedure of the risk of shielding failure at common shaft tower place, by input lightning current, lightning conducter is to ground level, wire is to ground level, lightning conducter spacing, shielding angle and ground elevation data calculate the risk of shielding failure at shaft tower place, Part II is the risk of shielding failure calculation procedure across power transmission line place, mountain valley shaft tower, by input lightning current, high hilltop lightning conducter is to ground level, short hilltop lightning conducter is to ground level, high hilltop wire is to ground level, short hilltop wire is to ground level, lightning conducter spacing, high hilltop height above sea level, short hilltop height above sea level and wire midpoint ground elevation data calculate the risk of shielding failure across power transmission line place, mountain valley shaft tower,
(3) measure and gather each common shaft tower place and across power transmission line place, mountain valley shaft tower desired data, input step (2) described calculation procedure, calculate each common shaft tower place and the risk of shielding failure across power transmission line place, mountain valley shaft tower, after list records, filter out the shaft tower that shaft tower that risk of shielding failure is greater than 0.03 is defined as zinc oxide surge arresters.
Common shaft tower is, across power transmission line place, mountain valley its power transmission line of shaft tower across mountain valley with the difference across power transmission line place, mountain valley shaft tower.Traditional risk of shielding failure and back flash-over rate computational methods do not consider that the process of thunderbolt wire and the factor such as lightning current size and ground elevation are on the impact of lightning conducter shield effectiveness, therefore the specific features of thunderbolt wire can not often be reflected, electric geometry method method (EGM)---at least can utilize and be based upon the improved EGM hit apart from conceptual foundation transmission line risk of shielding failure is calculated, reflect the structure of transmission line and landforms more all sidedly to the impact of shielding.Shaft tower risk of shielding failure being greater than 0.03 is defined as the shaft tower filling lightning arrester, and namely this selection ensure that the impact avoiding damage to crops caused by thunder as far as possible, has taken into account efficiency and economy simultaneously.
Beneficial effect of the present invention is as follows: utilize damage to crops caused by thunder distribution map to determine section to be calculated, utilize the common shaft tower of electric geometry method method (EGM) calculation of sector and across power transmission line place, mountain valley shaft tower risk of shielding failure and select the shaft tower that shaft tower that risk of shielding failure is greater than 0.03 is defined as filling lightning arrester.The present invention reduces the scope of calculation of sector by analyzing damage to crops caused by thunder distribution map, calculation stress is determined three, the section of level Four damage to crops caused by thunder grade, have employed advanced reasonably computational methods and distinguish the common shaft tower of different condition and the risk of shielding failure across power transmission line place, mountain valley shaft tower, under the theory support of first two steps, the shaft tower of zinc oxide surge arresters is determined through great many of experiments, taken into account efficiency and economy, the layout for lightning arrester provides the system of selection that a kind of good theory combines practice.Protect in the specific experiment process of two wires according to the method for the invention North China Power Telecommunication Network god, North China Power Telecommunication Network god protects two wires and does not occur shielding phenomenon in 1 year completely.
Accompanying drawing explanation
Fig. 1 is 2003 ~ 2011 years North China's shielding damage to crops caused by thunder distribution maps, and in figure, redness and orange areas are three grades and level Four damage to crops caused by thunder region.
Embodiment
500kV electric transmission line lightning arrester arranges method, comprises the steps,
(1) the easily section of hitting and the lightning stroke trip reason of transmission line is determined; Be specially and utilize shielding damage to crops caused by thunder distribution map and lightning strike accident statistical analysis over the years, section that is residing three, level Four damage to crops caused by thunder grade is defined as the easily section of hitting, i.e. section to be calculated;
(2) electric geometry method method (EGM) is utilized to calculate the common shaft tower of section to be calculated and the risk of shielding failure across power transmission line place, mountain valley shaft tower, be specially the computational methods factorization utilizing existing electric geometry method method (EGM), program is made up of two parts, Part I is the calculation procedure of the risk of shielding failure at common shaft tower place, by input lightning current, lightning conducter is to ground level, wire is to ground level, lightning conducter spacing, shielding angle and ground elevation data calculate the risk of shielding failure at shaft tower place, Part II is the risk of shielding failure calculation procedure across power transmission line place, mountain valley shaft tower, by input lightning current, high hilltop lightning conducter is to ground level, short hilltop lightning conducter is to ground level, high hilltop wire is to ground level, short hilltop wire is to ground level, lightning conducter spacing, high hilltop height above sea level, short hilltop height above sea level and wire midpoint ground elevation data calculate the risk of shielding failure across power transmission line place, mountain valley shaft tower,
(3) measure and gather each common shaft tower place and across power transmission line place, mountain valley shaft tower desired data, input step (2) described calculation procedure, calculate each common shaft tower place and the risk of shielding failure across power transmission line place, mountain valley shaft tower, after list records, filter out the shaft tower that shaft tower that risk of shielding failure is greater than 0.03 is defined as zinc oxide surge arresters.
For not being in three, the common shaft tower of the section of level Four damage to crops caused by thunder grade and across power transmission line place, mountain valley shaft tower, if its height above sea level higher than 1000m and span is greater than 550 meters, is also defined as the shaft tower of zinc oxide surge arresters.
Embodiment 1
For North China Power Telecommunication Network, god protects two wires, and easily the shaft tower place risk of shielding failure of the section of hitting is calculated as follows shown in table,
Easily the section of hitting be calculated as follows shown in table across power transmission line place, mountain valley shaft tower risk of shielding failure,
Finally determine that the tower bar needing zinc oxide surge arresters is as shown in the table,
Shaft tower Turriform Installation site
177# ZIVG-39 Left and right
178# ZIVG-39 Left and right
179# ZIVG-33 Left and right
180# ZIVG-42 Left and right
181# ZIVG-27 Left and right
182# ZIVG-48 Left and right
183# JII-27 Left and right
320# ZIG-33 Left and right
321# ZIIIG-39 Left and right
322# ZIIIG-42 Left and right
323# ZIIG-39 Left and right
324# ZIIIG-27 Left and right
325# ZIIIG-30 Left and right
326# ZIG-39 Left and right
327# ZIG-33 Left and right
360# ZIVG-48 Left and right
361# JⅠ-27 Left and right
387# ZIIG-27 Left and right
388# JⅠ-24 Left and right
389# ZIG-45 Left and right
390# ZIG-42 Left and right
391# JⅡ-24 Left and right
392# JⅠ-21 Left and right
188# ZIVG-30 Left and right
210# ZIIIG-27 Left and right
319# ZIG-33 Left and right
357# ZIVG-45 Left and right
364# JⅠ-27 Left and right
369# ZIG-27 Left and right
386# ZIG-30 Left and right
For not being in three, the shaft tower of the section of level Four damage to crops caused by thunder grade and across power transmission line place, mountain valley shaft tower, but its height above sea level is higher than 1000m and span is greater than 550 meters, is also defined as the shaft tower of zinc oxide surge arresters.It is as shown in the table,
Shaft tower Turriform Height above sea level (m) Landform Span (m) Risk of shielding failure
169# ZIVG-48 1336.418 High mountain high hill 796 0.0402
175# ZIVG-48 1553.02 High mountain high hill 785 0.0246
176# ZIVG-42 1479.733 High mountain high hill 872 0.0017
186# ZIVG-45 1981.023 High mountain high hill 847 0.0430
190# ZIVG-42 1688.903 High mountain high hill 792 0.0644
202# ZIG-27 1852.477 General mountain area 558 0.0216
211# ZIVG-42 1563.388 General mountain area 879 0.0307
214# ZIIIG-42 1603.393 General mountain area 670 0.0335
285# ZIIG-27 1478.36 Mountain 755 0.0016
286# ZIVG-27 1478.86 Mountain 757 0.0036
348# ZIVG-39 1094.52 High mountain high hill 893 0.0050
352# ZIIIG-27 1149.92 High mountain high hill 858 0.0212
383# ZIVG-45 1137.82 Hills 869 0.0592
After selected lightning arrester is installed according to the method described above, North China Power Telecommunication Network god protects two wires and does not occur shielding phenomenon in 1 year completely.

Claims (2)

1. 500kV electric transmission line lightning arrester arranges a method, it is characterized in that: comprise the steps,
(1) the easily section of hitting and the lightning stroke trip reason of transmission line is determined; Be specially and utilize shielding damage to crops caused by thunder distribution map and lightning strike accident statistical analysis over the years, section that is residing three, level Four damage to crops caused by thunder grade is defined as the easily section of hitting, i.e. section to be calculated;
(2) electric geometry method method (EGM) is utilized to calculate the common shaft tower of section to be calculated and the risk of shielding failure across power transmission line place, mountain valley shaft tower, be specially the computational methods factorization utilizing electric geometry method method (EGM), program is made up of two parts, Part I is the calculation procedure of the risk of shielding failure at common shaft tower place, by input lightning current, lightning conducter is to ground level, wire is to ground level, lightning conducter spacing, shielding angle and ground elevation data calculate the risk of shielding failure at common shaft tower place, Part II is the risk of shielding failure calculation procedure across power transmission line place, mountain valley shaft tower, by input lightning current, high hilltop lightning conducter is to ground level, short hilltop lightning conducter is to ground level, high hilltop wire is to ground level, short hilltop wire is to ground level, lightning conducter spacing, high hilltop height above sea level, short hilltop height above sea level and wire midpoint ground elevation data calculate the risk of shielding failure across power transmission line place, mountain valley shaft tower,
(3) measure and gather each common shaft tower place and across power transmission line place, mountain valley shaft tower desired data, input step (2) described calculation procedure, calculate each common shaft tower place and the risk of shielding failure across power transmission line place, mountain valley shaft tower, after list records, filter out the shaft tower that shaft tower that risk of shielding failure is greater than 0.03 is defined as zinc oxide surge arresters.
2. 500kV electric transmission line lightning arrester according to claim 1 arranges method, it is characterized in that, for not being in three, the common shaft tower of the section of level Four damage to crops caused by thunder grade and across power transmission line place, mountain valley shaft tower, if its height above sea level is higher than 1000 meters and span is greater than 550 meters, be also defined as the shaft tower of zinc oxide surge arresters.
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CN105406438A (en) * 2015-12-10 2016-03-16 国网四川省电力公司电力科学研究院 Light line lightning arrester arrangement method
CN109521343B (en) * 2018-12-29 2020-11-10 广东电网有限责任公司 Method for evaluating lightning-induced tower protection range

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