CN107742881B - Virtual positive pole induction type lightning protection device on high-voltage direct-current overhead transmission line - Google Patents
Virtual positive pole induction type lightning protection device on high-voltage direct-current overhead transmission line Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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Abstract
A virtual positive pole induction lightning protection device on a high-voltage direct-current overhead transmission line is composed of a suspended insulated virtual positive pole lightning conductor, a high-voltage reactor, a high-voltage current-limiting resistor, a direct-current arrester, a high-voltage pilot resistor, a suspension insulator and a high-voltage shielding coaxial cable; the virtual positive lightning conductor positioned at the top end of the iron tower is connected with the high-voltage electric resistor and the high-voltage current-limiting resistor in series after being suspended and insulated from the iron tower, and then is connected with the positive conductor of the power transmission line; the virtual positive lightning conductor is fixed on the top end of the iron tower through an insulator, is suspended and insulated from the ground, presents a voltage value equivalent to a positive line and to the ground potential, is connected with the direct current lightning arrester at the same time, is connected with the direct current lightning arrester in parallel, and is used as a channel for discharging large current when the lightning protection of the virtual positive lightning conductor is grounded and overvoltage.
Description
Technical Field
The invention relates to a virtual positive pole induced lightning protection device for a high-voltage direct-current overhead transmission line of an electric power engineering, and belongs to the technical field of safety protection of high-voltage direct-current overhead transmission lines.
Background
Since the application of the direct current transmission technology in the power system around the world in the middle of the last century, the direct current transmission technology has obvious advantages in the aspect of networking of a long-distance and large-capacity power system, and not only improves the economic indication and the technical performance of the power system, but also ensures that the power system operates more reliably.
With the implementation of the development strategy of western electric east delivery, north-south mutual supply and national networking of national grid companies and south-China grid companies, the ultra-high voltage alternating current/direct current transmission line is largely built and put into operation, and the electric power industry of China has entered a high-speed development period.
In 2010, 5 direct current transmission lines are established in China to connect the Huazhong power grid and the Huadong power grid, and the south power grid also forms 2 alternating current-direct current parallel transmission channels and is connected with the Huazhong power grid through a return direct current transmission line. The direct current transmission technology plays a very important role in western electric east delivery and national networking engineering in China.
From the construction and expected development of the current power grid in China, the transmission distance of the line is long, and due to the topography characteristics of China, the transmission line must pass through a large number of areas with complex climatic environments, and in the areas, the transmission line is subjected to the examination of various factors such as lightning stroke, icing, pollution and the like. Especially lightning disasters. Statistics show that lightning strike lines are the main cause of line faults. The direct current transmission line in China mainly takes the grade of +/-500 kV, and 7 +/-500 kV direct current lines are sequentially built since the first Ge Zhouba-south bridge +/-500 kV direct current transmission project is built in 1989. The statistics of the lightning flashover rate of the + -500 kV direct current line by the national power grid company are shown in the table I.
Meter I, national grid company + -500 kV DC line lightning flashover (2004-2007)
In order to show the characteristics of lightning flashover of the direct current transmission line, the second table gives the lightning statistical data of the direct current line in Guangdong area with stronger domestic lightning activity.
From the data of the table II, the lightning strike flashover rate of the +/-500 kV line in China is obviously higher than the lightning strike trip rate of the alternating current 500kV line. As can be seen from the data in the table, the positive polarity wire lightning strike event occupies 87.5% because the lightning in China is mostly (about 90%) in the negative polarity.
Meter two Guangzhou direct current line lightning flashover rate statistics table
Lightning protection measures of the existing direct current overhead line: in the prior art, two grounded lightning conductor devices are erected at the top end of an iron tower as in an alternating-current high-voltage overhead line.
At present, lightning protection measures for high-voltage direct current lines are as follows: 1) The main and effective measure for reducing the shielding failure flashover rate of the lightning strike line is to reduce the protection angle of the lightning conductor. Because the high-voltage direct current line only has two lines, if the lightning conductor adopts a negative protection angle, the problem of middle phase shielding failure caused by the increase of the distance between 2 lightning conductors is avoided, which is different from a single-circuit alternating current line, and therefore, the lightning conductor of the high-voltage direct current line usually adopts a small protection angle as much as possible. 2) The main measures of reducing the impact flashover rate of the lightning strike line are to increase the line insulation and reduce the grounding resistance of the pole tower.
The specific requirements of the lightning protection of the direct current circuit are as follows: the damage caused by the atmospheric overvoltage of the ultra-high voltage direct current overhead line is considered, and meanwhile, the whole line is still erected with the ground wire in view of the importance in the system. Because the direct current transmission line has only positive and negative poles, the poles are horizontally arranged, and the two lightning wires are horizontally arranged. The distance between two ground wires on the tower is required not to exceed 5 times of the vertical distance between the ground wires and the wires, and the protection angle of the ground wires to the wires is generally about 15 degrees.
The following lightning protection scheme is adopted in the HVDC project in the common design manual:
the common line section adopts double ground wires, the protection angle of the ground wires in the mountain is controlled at-10 ℃, and the protection angle of the ground wires to the outer side wires is controlled at 10 degrees. The whole ground wire is directly grounded, and the horizontal distance between two ground wires is not more than 5 times of the vertical distance between the ground wires and the conducting wires. The lightning conductor and the iron tower are grounded base by base, and the grounding resistance value meets the design requirement. The iron tower is grounded by adopting four-point down-lead wires, and the grounding devices are all adoptedRound steel.
According to the statistical condition of an operation department, for example, a home dam-Shanghai + -800 kV extra-high voltage direct current transmission project (the full length of a line is 1907 km), lightning flashover occurs for 2 times in the first year of the operation, and the lightning flashover rate is 0.105 times/(100 km.year); the ultra-high voltage direct current transmission project (the whole line length is 2090 km) of the Bright screen-Sunan plus or minus 800kV has the average lightning flashover 2 times per year and the lightning flashover rate is 0.095 times/(100 km.year). The lightning flashover rate operation data are all about 0.1 time/(100 km.year).
As known from the running experience of +/-500 kV in China, lightning flashover of the positive-polarity lead is easy to occur, because most of lightning in China is negative in polarity and accounts for about 90%, the direct-current working voltage has great influence on lightning shielding failure, and particularly, the direct-current working voltage is applied to an ultra-high-voltage direct-current transmission line. Since the DC working voltage is high, the influence factor is more obvious, and the working voltage value on the impact distance of the wire is also considered. And according to the preliminary judgment, the lightning flashover accidents are all winding flashovers which occur on the positive electrode line, and the existing operation experience is seen. The positive polarity lead in the extra-high voltage direct current line has obvious lightning-striking effect and is easier to strike than the negative polarity lead.
Description of lightning theory on atmospheric physics:
lightning is an electrical phenomenon occurring in thundercloud, and only the thundercloud may generate lightning.
Lightning refers to a discharging process between charge centers of different symbols in a rain-collecting cloud, or between a charge center in the cloud and the earth and ground objects, or between a charge center in the cloud and a charge center of atmosphere of different symbols in the atmosphere outside the cloud.
According to the lightning position, two main types of cloud flash and ground flash can be classified, wherein:
(1) Cloud flashing: refers to lightning that does not contact the ground and the ground object. It includes intra-cloud lightning, inter-cloud lightning and cloud-to-cloud lightning.
The in-cloud lightning refers to a discharging process between charging centers of different symbols in the cloud;
cloud lightning refers to the discharge process between different symbol charge centers in two clouds.
(2) Performing ground flashing: the lightning is in contact with the ground and the ground object.
The test results of lightning research scientists show that when the earth is struck by lightning, most of negative charges discharge from Lei Yunxiang to the earth, and few of positive charges on thundercloud discharge to the earth.
Meanwhile, the observation shows that the number of the cloud flash discharged in the atmosphere is larger than that of the ground flash, and the cloud flash accounts for more than two thirds of the total lightning. Why is the probability of a lightning strike on a dc positive line greater than on an ac line? Analysis herein: because most (90%) of the lightning strike is negative-polarity lightning, the cloud flash phenomenon that negative-polarity charges of the cloud layer are easily discharged with positive poles of the wires in positive and negative charges is generated, and the lightning strike tripping rate of the direct-current transmission line is higher than that of the alternating-current transmission line.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the virtual positive pole induction lightning protection device for the high-voltage direct-current overhead transmission line, which has reasonable and simple structural composition, is convenient and reliable to use, can effectively prevent lightning stroke and ensures the safe operation of the high-voltage direct-current overhead transmission line in power engineering.
The invention aims at being completed through the following technical scheme that the virtual positive electrode induction lightning protection device on the high-voltage direct-current overhead transmission line consists of a virtual positive electrode lightning protection wire which is insulated in a suspending way, a high-voltage electric reactor, a high-voltage current-limiting resistor, a direct-current lightning arrester, a high-voltage lead resistor, a suspension insulator and a high-voltage shielding coaxial cable; the virtual positive lightning conductor positioned above the positive electrode of the direct-current overhead transmission line, namely positioned at the top end of the iron tower, is connected with the high-voltage electric resistor and the high-voltage current-limiting resistor in series after being suspended and insulated from the iron tower, and is then connected with the positive electrode lead of the high-voltage direct-current transmission line;
the virtual positive lightning conductor is connected with the direct current lightning arrester in parallel, the core conductor of the high-voltage shielding coaxial cable is connected with the direct current lightning arrester in parallel, and the direct current lightning arrester is used as a channel for discharging large current when lightning protection of the virtual positive lightning conductor is grounded and overvoltage.
As preferable: the lightning protection device is arranged in the high-voltage direct-current overhead transmission line at a spacing distance of 50-100 km as a unit group; the high-voltage reactor is an iron core type reactor with a multi-turn winding; the high-voltage current-limiting resistor and the high-voltage pilot resistor are cement-type or ceramic-type high-voltage resistors; the suspension insulator is an XP-70 universal outdoor insulator or a rod-type support insulator; the voltage withstand level is selected to be matched with the voltage level in the power transmission line; the high-voltage shielding coaxial cable is a high-voltage cable with a double-conductor structure, the voltage withstand level is matched with the voltage level of the power transmission line, the head end of a core wire of an inner conductor layer of the cable is connected with a suspended insulated virtual positive lightning conductor, the tail end of the cable is suspended and insulated, the cable is supported and fixed by a rod-type pillar insulator, and an outer shielding conductor of the cable is connected with a grounding electrode.
The invention belongs to the improvement of the prior art, and has the characteristics of reasonable and simple structural composition, convenient and reliable use, effective lightning stroke prevention, safe operation of a high-voltage direct-current overhead transmission line of power engineering and the like.
Drawings
Fig. 1 is a schematic structural diagram of a conventional unmodified lightning conductor BL of a dc transmission line.
Fig. 2 is a schematic diagram of transformation of a virtual positive pole induced lightning conductor of a direct current transmission line.
Fig. 3 is a schematic diagram of a "virtual positive" induced lightning protection architecture in a hvdc system.
Fig. 4 is a top view of a conventional lightning conductor system of a dc transmission line.
Fig. 5 is a schematic diagram of the transformation of the lightning conductor above the positive polarity wire of the dc transmission line.
Fig. 6 is a schematic diagram of a modified cross section of a virtual positive lightning conductor of a dc transmission line
Detailed Description
The invention will be described in detail below with reference to the attached drawings: fig. 2-6 show that the virtual positive electrode induced lightning protection device for the high-voltage direct-current overhead transmission line is formed by suspending and insulating virtual positive electrode lightning conductor BL, high-voltage electric reactor DK and high-voltage current-limiting resistor R 1 Direct current arrester FZ, high voltage pilot resistor R 2 A suspension (strut type) insulator JY and a high-voltage shielding coaxial cable L; the virtual positive lightning conductor BL (also called 1# lightning conductor BL) is positioned above the positive electrode (also called I electrode) of the direct current overhead transmission line, namely positioned at the top end of the iron tower 1 ) High-voltage current limiting resistor R and high-voltage resistor coil DK after being suspended and insulated from iron tower 1 The series connection wire is connected with the positive electrode lead of the high-voltage direct-current transmission line;
the virtual positive electrode lightning conductor BL with suspended insulation is fixed at the upper top end of the iron tower through the insulator JY, is suspended and insulated with the ground, presents a voltage value to the ground potential equivalent to that of a positive electrode line, is simultaneously connected with the direct current lightning arrester FZ, and is provided with a high-voltage pilot resistor R 2 And the high-voltage shielding coaxial cable L is connected with the direct-current lightning arrester FZ in parallel, and the direct-current lightning arrester FZ is used as a channel for discharging large current when the lightning protection of the suspended insulated virtual positive-electrode lightning conductor BL1 is grounded and overvoltage.
The lightning protection device is arranged in a high-voltage direct-current overhead transmission line, and the spacing distance between the lightning protection device and the high-voltage direct-current overhead transmission line is 50-100 km, so that the lightning protection device is a unit group; the high-voltage reactor DK is an iron core type reactor with a plurality of turns and windings; the high-voltage current-limiting resistor R 1 High-voltage pilot resistor R 2 The high-voltage resistors are cement-type or ceramic-type high-voltage resistors; the suspension insulator JY is a XP-70 general outdoor insulator or a rod-type strut insulator; the voltage withstand level is selected to be matched with the voltage level in the power transmission line; the high-voltage shielding coaxial cable L is a high-voltage cable with a double-conductor structure, the withstand voltage level is matched with the voltage level of the power transmission line, the head end of a core wire of an inner conductor layer of the cable is connected with a suspended insulating virtual positive lightning conductor BL, the tail end of the cable is suspended and insulated, the cable is supported and fixed by a rod-type pillar insulator, and an outer shielding conductor of the cable is connected with a ground electrode.
Principle description of the invention: the high-voltage direct-current overhead transmission line in the prior art is easy to be struck by lightning, and mainly occupies more than 90% of lightning strike probability on the transmission line with positive (+) pole and I pole, and is higher in probability of negative polarity lightning due to atmospheric physics, meanwhile, when the pole tower is high enough, the lightning generated on the positive pole is not necessarily caused by ground flash, but is most likely to be generated in a 'semi-cloud flash' mode. I.e., the process of "semi-cloud flash" in which the charged clouds of "+" and "-" charges of the positive line directly cause flashovers, which is why the positive line malfunctions are particularly high (up to 90%).
The invention reforms the traditional lightning conductor above the positive pole line, firstly, the original lightning conductor is dismantled at the directly grounded connecting end on the iron tower, and the lightning conductor BL is suspended and insulated from the ground by the method of fixedly connecting the suspension insulator JY with the iron tower, and then passes through the high-voltage reactor DK and the high-voltage current-limiting resistor R 1 The lightning protection device is connected with an anode circuit I pole after being connected in series, and the essence in an electric loop is to lead a lightning conductor BL and the anode circuit to be electrically conductive and above the anode circuit, so that negative charges in thundercloud are easier to approach the lightning conductor BL with a virtual anode because the lightning conductor BL is higher than a lead, and the lightning protection device performs flashover discharge in advance in a semi-cloud flashover mode, thereby protecting the anode power transmission line from being discharged by negative polarity lightning.
1. The invention provides a high-voltage reactor coil DK, which aims to ensure that when lightning is struck by lightning, the lightning wave is a high-frequency pulse current, and the frequency f=100 KZ-1 MHZ. Thus, using the reactor is based on the inductor principle: x is X L When f is sufficiently large, the reactance value presented becomes large, so that the reactor can effectively block the progress of lightning waves to protect the safety of the "positive" transmission line I pole. But for direct current it is conductive and thus can conduct electricity over the lightning conductor BL- (1).
2. High-voltage current-limiting resistor R 1 Is arranged to make it possible to directly short the positive line to the ground at risk of failure due to the action of the lightning arrester FZ when the lightning conductor BL is struck by lightning in the event of a lightning strike, a high-voltage current-limiting resistor R being arranged to reduce and control the short-circuit current of the direct current system 1 The impedance value is designed according to the controlled safe short-circuit current value of the direct current system.
3. High-voltage pilot resistor R connected between virtual positive electrode lightning conductor BL and ground 2 The function of the ground wire is to lead the ground wire to have the ground charge, because the lightning conductor BL is in a suspended state, when the ground lightning strike occurs, the lead capacity of the lightning conductor BL is reduced, and the high-voltage lead resistor R is connected in parallel 2 After that, can be improvedThe leading action of the ground wire and the ground lightning stroke protects the positive electrode circuit from the action of lightning stroke.
4. The purpose of using the high-voltage shielded cable L connected in parallel to the lightning arrester FZ is to provide a high-frequency path for the lightning current. The principle is thatWhen the capacitance of the cable is larger than 0.01 mu f, the main high-frequency pulse of the lightning wave is 1MHz, the capacitance resistance of the cable is +.>X c The capacitance drops greatly, indicating that the cable can absorb the high frequency component of the lightning pulse wave.
In the scheme, the lightning conductor device above the negative polarity conductor of the overhead direct-current transmission line maintains the original state of the ground wire in a direct grounding mode without modification.
Examples: the invention removes a lightning conductor BL which is positioned above a positive electrode lead of a direct-current overhead transmission line and is grounded by a tower by tower originally, and after the grounding wire of an iron tower is suspended by a suspension insulator JY, the lightning conductor BL is connected with a high-voltage current-limiting resistor R by a high-voltage resistor DK 1 After the series connection, the connection is bridged to the electric transmission line of the positive electrode. At the same time, the lightning conductor BL passes through the lightning arrester FZ and the high-voltage pilot resistor R 2 The parallel connection is connected with the ground (iron tower) to be used as a unit group wiring, and in a long transmission line, equipment devices of one unit are arranged at intervals of 50-150 KM.
The specific equipment is selected as follows:
1. the DK of the high-voltage reactor calculates the reactance value X of the reactor according to the level exceeding 100A after the current of the DC positive electrode wire is gushed when the lightning strike voltage is 1000kV L
Inductance value X L =2pi fL (reactance inductance formula)
If the frequency of the lightning current is takenAt 5KHZ, 10000 Ω=2pi×5000L,henry, the inductance value of the designed reactor is L=0.15 henry, and the line diameter is not smaller than 4mm 2 Is wound up. According to the design principle of the reactor, the diameter of the reactor is D PJ At=60 cm, the number of turns N takes 500 turns. The manufacturer is a suntan transformer factory.
2. High-voltage current-limiting resistor R 1 Is selected from the group consisting of: the purpose of this resistor is to generate a high potential when the lightning conductor BL is struck by lightning, which will turn on the lightning arrester FZ, whereas for a DC transmission line when the "positive" conductor is connected to the ground, this corresponds to a short-circuited state of the transmission line, since in a DC transmission system one of the conductors is used with the ground as conductor, the short-circuit current value I of the DC system must be controlled after the lightning arrester FZ has been actuated D The reactor DK corresponds to a path for direct current, and has no significant impedance effect. Therefore, a current limiting resistor R must be used 1 To act as a control short circuit current value. Assuming that the DC system voltage is 500kV, the short-circuit current is controlled at 100A level, the resistor
Selecting a current limiting resistor R 1 The resistance value of (2) is 5kΩ, a high-power cement heat-resistant ceramic high-voltage resistor is adopted, and the manufacturer is Shenzhen national electronic Co.
3. Lead Lei Xiandao resistor R 2 Selection of (3)
Because the lightning conductor BL above the positive pole is overhead and will affect the upward pilot action of the ground lightning strike, it is necessary to make the lightning conductor BL have a weak charge connection channel with the ground, but because the lightning conductor BL runs at ordinary times at a potential as high as the DC rated voltage Ue, in order to reduce the loss value, when the power loss value at ordinary times of the resistance value is about 1000W, thereby,and taking a pilot resistor with a high-voltage and high-resistance value. The resistor is also made of cement ceramic resistor, and the manufacturer is Shenzhen national China electronic Co.
4. Selection of DC lightning arrester FZ
The corresponding direct current transmission line selects a direct current special lightning arrester device with a matched voltage level, in the example, a + -500 kV line is taken as an example, and the selected lightning arrester is of the model YH20CXL-571/1200 and is manufactured by a manufacturer: the electric department of Guoguan, wuhan nan Rui Co., ltd.
5. Insulator selection (suspension and rod type support)
Because the lightning conductor BL above the positive electrode lead in the direct current transmission line is suspended and insulated, the suspension insulator of XP-70 of the insulating device is fixed, the number of the insulators connected in series is determined according to the voltage level of the line, 25-30 sheets of suspension insulators of XP-70 are commonly used for +/-500 kV in a series superposition installation mode, ZSW1-500/14K-3 is selected for rod type post insulators, and the manufacturer is a western electric porcelain factory.
6. The high-voltage shielding coaxial cable L is a crosslinked polyethylene coaxial cable with a withstand voltage level of +/-500 kV, and the thickness of an insulating layer is required to be more than 30mm, and the wave impedance value is required to be less than 20 omega. The shielding cable is used for absorbing the lightning high-frequency pulse component of the lightning arrester FZ, the length of the shielding cable is required to be more than 100M for achieving good absorption effect, the shielding cable can be installed on a ground from the top of the tower in a parallel connection mode, wherein the upper end of an inner core layer is connected with a suspended ground wire BL, the lower end of the inner core layer is suspended in an insulating state, and the rod-shaped strut insulator JY-6-1 is used for fixing. The outer conductor of the cable is connected with the grounding electrode, and the purpose of the outer conductor is to absorb the energy of the lightning high-frequency pulse wave by utilizing the high-voltage resistant capacitance effect formed by the capacitance layer between the two conductors of the coaxial cable. The cable wire is selected from the manufacturer: cross-linked 330 kV-500 kV high-voltage single-core insulated cable produced by Shandong Runner energy cable plant.
Claims (2)
1. A virtual positive pole induction lightning protection device on a high-voltage direct-current overhead transmission line is composed of a suspended insulated virtual positive pole lightning conductor (BL), a high-voltage reactor (DK), a high-voltage current-limiting resistor (R1), a direct-current lightning arrester (FZ), a high-voltage pilot resistor (R2), a suspension insulator (JY) and a high-voltage shielding coaxial cable (L); the method is characterized in that a virtual positive lightning conductor (BL) above the positive electrode of the direct current overhead transmission line, namely positioned at the top end of an iron tower, is connected with a high-voltage reactor (DK) and a high-voltage current-limiting resistor (R1) in series after being suspended and insulated from the iron tower, and is then connected with a positive electrode lead of the high-voltage direct current transmission line;
the virtual positive electrode lightning conductor (BL) with unsettled insulation is fixed in the top of iron tower through insulator (JY) to unsettled and earth insulation presents the voltage value to the earth potential equivalent with the positive electrode circuit, virtual positive electrode lightning conductor (BL) is connected with direct current arrester (FZ) simultaneously, high voltage lead resistor (R2) and direct current arrester (FZ) parallel connection line, high voltage shielding coaxial cable (L)'s core conductor and direct current arrester (FZ) parallel connection line, direct current arrester (FZ) are as excrete the passageway of heavy current when unsettled insulating virtual positive electrode lightning conductor (BL) lightning protection ground connection overvoltage.
2. The virtual positive pole induction lightning protection device for the high-voltage direct-current overhead transmission line according to claim 1, wherein the lightning protection device is arranged in the high-voltage direct-current overhead transmission line at a spacing distance of 50-100 km as a unit group; the high-voltage reactor (DK) is an iron core type reactor with a plurality of turns and windings; the high-voltage current-limiting resistor (R1) and the high-voltage pilot resistor (R2) are cement-type or ceramic-type high-voltage resistors; the suspension insulator (JY) is an XP-70 universal outdoor insulator or a rod-type strut insulator; the voltage withstand level is selected to be matched with the voltage level in the power transmission line; the high-voltage shielding coaxial cable (L) is a high-voltage cable with a double-conductor structure, the voltage-withstanding level is matched with the voltage level of the power transmission line, the head end of a core wire of an inner conductor layer of the cable is connected with a suspended insulated virtual positive lightning conductor (BL), the tail end of the cable is suspended and insulated, the cable is supported and fixed by a rod-type pillar insulator, and an outer shielding conductor of the cable is connected with a ground electrode.
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| CN201711121030.8A CN107742881B (en) | 2017-11-14 | 2017-11-14 | Virtual positive pole induction type lightning protection device on high-voltage direct-current overhead transmission line |
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| CN108616115A (en) * | 2018-05-02 | 2018-10-02 | 国网陕西省电力公司电力科学研究院 | A kind of 110kV electric power line pole towers enter land mine current limitation method and device |
| CN114336179B (en) * | 2021-12-31 | 2023-11-21 | 国网河南省电力公司周口供电公司 | Lightning-proof broken line protection device for shielding, insulating and isolating 10kV overhead insulated line |
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| US4270160A (en) * | 1978-03-17 | 1981-05-26 | Mitsubishi Denki Kabushiki Kaisha | Lightning resistive device in aerial power transmission system |
| US4675773A (en) * | 1984-11-05 | 1987-06-23 | Hitachi, Ltd. | Transmission line protection system |
| CN203278165U (en) * | 2013-06-25 | 2013-11-06 | 广西电网公司电力科学研究院 | 10kV overhead distribution line arrester arrangement structure |
| CN205016965U (en) * | 2015-10-26 | 2016-02-03 | 厦门理工学院 | Overhead transmission line lightning protection device and resistant thunder horizontal checkout system thereof |
| CN207910458U (en) * | 2017-11-14 | 2018-09-25 | 张京伦 | The virtual positive induction type lightning conducter lightning protection device in high voltage direct current overhead transmission line road |
-
2017
- 2017-11-14 CN CN201711121030.8A patent/CN107742881B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4270160A (en) * | 1978-03-17 | 1981-05-26 | Mitsubishi Denki Kabushiki Kaisha | Lightning resistive device in aerial power transmission system |
| US4675773A (en) * | 1984-11-05 | 1987-06-23 | Hitachi, Ltd. | Transmission line protection system |
| CN203278165U (en) * | 2013-06-25 | 2013-11-06 | 广西电网公司电力科学研究院 | 10kV overhead distribution line arrester arrangement structure |
| CN205016965U (en) * | 2015-10-26 | 2016-02-03 | 厦门理工学院 | Overhead transmission line lightning protection device and resistant thunder horizontal checkout system thereof |
| CN207910458U (en) * | 2017-11-14 | 2018-09-25 | 张京伦 | The virtual positive induction type lightning conducter lightning protection device in high voltage direct current overhead transmission line road |
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| CN107742881A (en) | 2018-02-27 |
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