CN110729691A - Hot water deicing system and method for insulator in ultrahigh voltage transmission line - Google Patents
Hot water deicing system and method for insulator in ultrahigh voltage transmission line Download PDFInfo
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- CN110729691A CN110729691A CN201911081098.7A CN201911081098A CN110729691A CN 110729691 A CN110729691 A CN 110729691A CN 201911081098 A CN201911081098 A CN 201911081098A CN 110729691 A CN110729691 A CN 110729691A
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- hot water
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Abstract
The invention provides a hot water deicing system and method for insulators in an ultrahigh voltage power transmission line, which comprises the following steps: the system comprises hot water deicing equipment, a power supply and a helicopter for carrying the hot water deicing equipment; the hot water deicing equipment comprises pretreated water, a water tank for containing the pretreated water, a temperature control device, a pressurizing device, a jet device and a power supply, wherein the temperature control device, the pressurizing device, the jet device and the power supply are used for heating the pretreated water and controlling the water temperature within a preset temperature range, the pressurizing device is used for providing water flow with a preset pressure value for the jet device, the input of the temperature control device is connected with the water tank, the output of the temperature control device is connected with the input end of the pressurizing device, the output end of the pressurizing device is connected with the jet device, and the pretreated water is distilled water which is distilled and condensed. The invention is mainly used for deicing insulators in the ultra-high voltage transmission line, and can perform deicing operation under the condition of electrification of the transmission line by performing deionization treatment on deicing hot water, and the deicing efficiency is high.
Description
Technical Field
The invention relates to the field of power grid transmission equipment deicing, in particular to a hot water deicing system and method for insulators in an ultrahigh voltage transmission line.
Background
The surface of power transmission equipment of a power grid is easy to be coated with ice in severe meteorological environments such as low temperature, the electrical performance of the power transmission equipment after ice coating is changed, the safety and the stability of the power grid are threatened, especially, the electrical performance of the power transmission equipment is unstable due to ice coating on the surface of the power transmission equipment in an extra-high voltage main network power transmission line, such as insulator ice coating flashover, and if an ice coating flashover fault occurs on a line insulator, the safety operation of the power transmission main network is seriously threatened. In the existing deicing method, a method for deicing an ice-coated line by adopting large current is well known for a long time, but the method can only remove the ice on a wire and cannot remove the ice-coated on a live insulator; in an ultrahigh voltage main network, for example, 50 kilovolts and above, the existing method for deicing by using the heat of a ground substation cannot be directly adopted due to the very high erected power grid.
Therefore, there is a need for a hot water deicing system and method for insulators in extra-high voltage transmission lines.
Disclosure of Invention
In view of the above, the present invention provides a hot water deicing system and method for insulators in an ultra-high voltage transmission line based on helicopter mounting.
The invention provides a hot water deicing system for insulators in an ultrahigh voltage transmission line, which is characterized in that: the method comprises the following steps: the system comprises hot water deicing equipment, a power supply for supplying working electricity to the hot water deicing equipment and a helicopter for carrying the hot water deicing equipment;
the hot water deicing equipment comprises pretreated water, a water tank for containing the pretreated water, a temperature control device for heating the pretreated water and controlling the water temperature within a preset temperature range, a supercharging device, a jet device and a power supply, wherein the power supply is used for supplying working electricity to the hot water deicing equipment, the supercharging device is used for supplying water flow with a preset pressure value to the jet device, the input end of the temperature control device is connected with the water outlet of the water tank, the output end of the temperature control device is connected with the water inlet end of the supercharging device, the water outlet end of the supercharging device is connected with the input end of the jet device through a high-pressure water pipe, and the high-pressure hot water output by the jet device removes ice coated on the surface of an insulator,
the pretreated water is distilled water which is distilled and condensed.
Further, the pretreated water has an electrical conductivity of less than 1 x 10 when contacting the insulator-5S/cm of ionized water.
Further wherein the conductivity gamma of the pre-treated water before heating is determined in the following manner,
wherein γ represents the conductivity of water at normal temperature, ktCoefficient of conversion, γ, representing the conductivity of water in contact with the insulator and before heatingtThe conductivity of the water in contact with the insulator is indicated and t represents the temperature.
Furthermore, the deicing system further comprises a telescopic hollow insulating rod, a high-pressure water pipe is arranged in the hollow insulating rod, and the minimum value of the diameter of the hollow insulating rod is larger than or equal to the diameter of the high-pressure water pipe.
Further, the hollow insulating rod penetrates through an annular base fixedly connected with the helicopter.
Furthermore, the support frame of the annular base is fixedly connected with the workbench which extends outwards from the helicopter cabin door.
Further, the fluidic device includes the straight type nozzle of toper at least, the straight type nozzle of toper includes toper shrink pipe and cylindrical rectifier tube, the left end of toper shrink section with high pressure water piping connection, the right-hand member of toper shrink pipe with the one end of circular rectification is connected.
Further, the high-pressure water pipe comprises a reinforcing layer and a heat insulation layer, the reinforcing layer is used for reinforcing the compressive strength of the high-pressure water pipe, and the heat insulation layer is used for insulating water flowing through the high-pressure water pipe.
Correspondingly, the invention also provides a hot water deicing method for insulators in an extra-high voltage transmission line, which is used for the hot water deicing system as claimed in any one of claims 1 to 8, and is characterized in that: the method comprises the following steps:
s1: pretreating water for deicing the insulator;
s2: filling the pretreated water into a water tank, and heating the water in the water tank;
s3: after the water temperature in the water tank reaches a preset temperature, carrying a hot water deicing system to a target position by a helicopter;
s4: opening a water valve, adjusting the angle of the insulating rod to enable the water outlet of the jet device to be opposite to the surface of the insulator, deicing, and closing the water valve after the current insulator deicing is finished;
s5: and the previous next deicing point enters step S4 until the deicing task is completed.
Further, step S3 includes: and determining a safety distance according to the length of the helicopter wing and the voltage grade of the power transmission line where the insulator to be deiced is located.
The invention has the beneficial technical effects that: the method is mainly used for deicing of insulators in the transmission line under the condition of extra-high voltage, such as more than 50 ten thousand kilowatts, and can perform deicing operation under the condition of electrification of the transmission line by performing deionization treatment on deicing hot water and has high deicing efficiency.
Drawings
The invention is further described below with reference to the following figures and examples:
fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a schematic illustration of hot water de-icing of the present invention.
Fig. 3 is a schematic structural diagram of the fluidic device of the present invention.
Fig. 4 is a schematic structural view of the hollow insulating rod of the present invention.
FIG. 5 is a flow chart of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of the principle of the present invention, fig. 2 is a schematic diagram of hot water deicing for a helicopter of the present invention, fig. 3 is a schematic diagram of a structure of a tapered straight nozzle of the present invention, fig. 4 is a schematic diagram of a structure of a hollow insulating rod of the present invention, fig. 5 is a flowchart of steps of the present invention, in fig. 2, a is a water tank, B is a hot water heat-preserving and pressurizing device, C is a high-pressure water pipe, D is a switch valve at the end of the insulating rod, E is the hollow insulating rod, a dotted line inside the hollow insulating rod represents the high-pressure water pipe built therein, F is a thermal jet device, G is a bipod, in fig. 3, D is an inlet diameter, α is a contraction angle, D is an outlet diameter, L is a contraction section length, L is a cylindrical rectifying section length, in fig. 4, H is a first section of the hollow insulating rod, I is a second section.
The invention provides a hot water deicing system for insulators in an ultrahigh voltage transmission line, which is characterized in that: the method comprises the following steps: the system comprises hot water deicing equipment, a power supply for supplying working electricity to the hot water deicing equipment and a helicopter for carrying the hot water deicing equipment; the helicopter is a squirrel AS350 model, the maximum takeoff weight of the helicopter is 2250kg, the span length of the helicopter is 10.69m, the cabin length is 2m, the height of the helicopter is 1.3m, and the width of the helicopter is 1.65 m. The deicing device is arranged at the middle rear part of the helicopter; the power supply adopts the existing 5500W diesel generator, the output voltage is 220V, and the weight of the generator is 85 kg.
The hot water deicing equipment comprises pretreated water, a water tank for containing the pretreated water, a temperature control device for heating the pretreated water and controlling the water temperature within a preset temperature range, a supercharging device, a jet device and a power supply, wherein the power supply is used for supplying working electricity to the hot water deicing equipment, the supercharging device is used for supplying water flow with a preset pressure value to the jet device, the input end of the temperature control device is connected with the water outlet of the water tank, the output end of the temperature control device is connected with the water inlet end of the supercharging device, the water outlet end of the supercharging device is connected with the input end of the jet device through a high-pressure water pipe, and the high-pressure hot water output by the jet device removes ice coated on the surface of an insulator,
the pretreated water is distilled water which is distilled and condensed.
In this embodiment, the water tank is a cylindrical water tank, and includes a water inlet and a water outlet, the water inlet is on the upper surface, the water outlet is located 5cm away from the lower surface of the water tank, and the outlet is connected to a hot water heat preservation and pressurization device through a pipeline; the cylindrical tank has a volume of about 200L, a height of 0.93m and a bottom diameter of 5.8 m. The booster pump is used for pressurizing hot water in a plurality of stages, so that the pressure of the hot water reaches a megapascal level, and the pressure of outlet water of the booster pump is adjustable. The booster pump is a high-pressure plunger pump and is used for directly converting mechanical energy of a prime motor into pressure energy for conveying liquid through the pump, the rated power of the booster pump is 2200W, and the working pressure is 0-10 MPa. During the deicing process, the water pressure can be adjusted according to the actual deicing working condition. The temperature control device adopts an electric heating barrel, and a water outlet of the electric heating barrel is connected with the booster pump through a heat-resistant water pipe with a heat-insulating layer. In this embodiment, the rated power of the electric hot water bucket is 3200W, the volume of the electric hot water bucket is about 80L, the height of the electric hot water bucket is 0.6m, and the diameter of the bottom of the electric hot water bucket is 0.5 m. .
By the technical scheme, the deicing device is mainly used for deicing insulators in the transmission line under the condition of extra-high voltage, such as 50 ten thousand kilowatts and above, and through deionization treatment of deicing hot water, power failure treatment is not needed in the insulator deicing process, and the deicing efficiency is high.
In this embodiment, the conductivity of the pretreated water is less than 1 × 10 when it is in contact with the insulator-5S/cm of ionized water. Due to the fact thatThe conductivity of water rises along with the temperature of water, and water conductivity can increase, and the temperature of predetermineeing is that field operation personnel sets for according to operating condition, predetermineeing the temperature range and being 80 degrees centigrade to 90 degrees centigrade, consequently adopt the conductivity of the water before the limited heating in this embodiment.
Wherein the conductivity gamma of the pre-treated water before heating is determined in the following manner,
wherein γ represents the conductivity of water at normal temperature, ktCoefficient of conversion, γ, representing the conductivity of water in contact with the insulator and before heatingtIndicating the electrical conductivity of the water in contact with the insulator and t the temperature, where the subscript 20 indicates that the temperature of the pre-treated water before heating is assumed to be 20 degrees celsius.
In this example, when the water is heated to 80 ℃, the maximum conductivity of the 80 ℃ hot water at the nozzle outlet is 1 × 10-5S/cm, temperature conversion factor at this time
k80＝1.28704×0.9612880+0.41571＝0.470359；
The conductivity of the low-conductivity cold water subjected to deionization treatment by the water production system should not exceed gamma20＝0.480359×1×10-5S/cm＝4.80359×10-6S/cm. When the heating temperature was changed, the calculation procedure was the same as the above-mentioned method.
After the water is pretreated, the conductivity of the water in contact with the insulator is reduced, so that the insulator of the power transmission line is deiced when the power transmission line is in a charged state, and the stability of a power transmission main network is enhanced.
In this embodiment, as shown in fig. 4, the deicing system further includes a retractable hollow insulating rod, the high-pressure water pipe is disposed in the hollow insulating rod, and the minimum value of the diameter of the hollow insulating rod is greater than or equal to the diameter of the high-pressure water pipe. In this embodiment, the hollow insulating rod adopts a retractable structure to be used for deicing operations of power transmission lines with different voltage classes or at different distances, the insulating rod is divided into 5 sections, the length of each section of hollow rod is 3m, the diameter of each section of hollow rod is sequentially increased, and the diameter of the minimum section of hollow rod is enough for the built-in high-pressure water pipe. The insulating rod is made of PVC (polyvinyl chloride), and has excellent insulating property and low density.
The hollow insulating rod penetrates through the annular base fixedly connected with the helicopter.
And the support frame of the annular base is fixedly connected with a workbench which extends outwards from the helicopter cabin door. As shown in fig. 2.
When the power transmission lines with different voltage grades are deiced, the hollow insulating rod is extended or shortened according to the requirements of the insulating distance and the safe flight distance of the helicopter, so that the safe distance between an operator and an insulator to be deiced is ensured; that is to say, when the deicing is carried out on the transmission lines with different voltage classes, the distance between the helicopter body and the transmission line is not less than 15m, and the distance between the edge of the helicopter wing and the transmission line is not less than the safety distance specified by the voltage classes, namely, the distance between the 110kV transmission line and the transmission line is not less than 1.5m, the distance between the 220kV transmission line and the transmission line is not less than 3m, and the distance between the 500kV transmission line and the transmission line is. The extension length of the hollow insulating rod is not less than 10m, and the sum of the length of the insulating rod and the effective jet distance of the water jet is not less than the distance between the helicopter body and the power transmission line. Or when the power transmission line with a certain voltage class is deiced, on the premise of meeting the safety distance, the telescopic insulating rod is used for changing the deicing effect by changing the distance between the nozzle and the deicing line. That is to say, when deicing transmission line voltage level confirms, under the prerequisite that satisfies between helicopter organism and the transmission line that the distance is not less than 15m and helicopter wing and transmission line interval be not less than the safe distance of corresponding voltage level, through the length of flexible insulating rod, change deicing distance in the effective injection range of water jet, realize quick deicing.
After the hollow insulating rod is stretched, the middle part of the hollow insulating rod penetrates through a circular ring fixed on two foot frames, the circular ring is used as an operating fulcrum, an operator can switch on and off a thermal power jet device in a helicopter cabin by controlling a switch valve at the tail end of the hollow insulating rod, and the insulating rod and a high-pressure water pipe inside the insulating rod rotate within a certain angle range by using the circular ring as the fulcrum, so that deicing operation at different angles can be performed. The bipod and the supporting platform thereof are welded outside the helicopter cabin door and used for supporting the insulating rod and the high-pressure water pipe inside the insulating rod.
The hollow insulating rod is used for ensuring the personal safety of operators in the deicing process, and the deicing angle can be adjusted in real time through the hollow insulating rod, so that the deicing effect is enhanced.
In this embodiment, as shown in fig. 3, the fluidic device at least comprises a conical and straight nozzle, the conical and straight nozzle comprises a conical contraction pipe and a cylindrical rectifying pipe, the left end of the conical contraction section is connected with the high-pressure water pipe, and the right end of the conical contraction pipe is connected with one end of the circular rectifying pipe. The contraction section is connected with the tail end of the high-pressure water pipe through threads, and water flow accelerated by the conical contraction section enters air after passing through the cylindrical rectifying section. The left end and the right end are the left end and the right end shown in fig. 2, namely the left end is an inlet of a conical straight shape, and the right end is an outlet of the conical straight shape; the main structural parameters of the conical and straight nozzle comprise: the inlet diameter D is 7mm, the contraction angle alpha is 13 degrees, the outlet diameter D is 1-5mm and is adjustable, the contraction section length L is 5mm, and the ratio L/D of the length of the cylindrical rectifying section to the diameter of the outlet is 6.
The jet device is used for increasing the speed of inflowing water and increasing the contact stress of hot water and an insulator string, so that ice coating can fall off more quickly.
In this embodiment, the high pressure water pipe includes a reinforcement layer for reinforcing the compressive strength of the high pressure water pipe and an insulation layer for insulating water flowing through the high pressure water pipe. The high-pressure water pipe comprises an inner layer, a reinforcing layer, an outer cladding layer and a heat insulation layer. The inner pipe is used for conveying water and is made of waterproof rubber; the enhancement layer is used for improving the strength of the inner pipe to bear high pressure and is formed by mutually weaving 3 layers of carbon steel wires; the outer cladding layer is used for protecting the pipeline and preventing the pipeline from being corroded and damaged mechanically; the heat-insulating layer is used for isolating the outer cladding from ambient air and reducing the heat conductivity of the surface of the outer cladding so as to ensure that the hot water temperature of the inlet and the outlet of the high-pressure water pipe is basically consistent.
Correspondingly, the invention also provides a hot water deicing method for insulators in an extra-high voltage transmission line, which is used for the hot water deicing system as claimed in any one of claims 1 to 8, and is characterized in that: the method comprises the following steps:
s1: pretreating water for deicing the insulator;
s2: filling the pretreated water into a water tank, and heating the water in the water tank;
s3: after the water temperature in the water tank reaches a preset temperature, carrying a hot water deicing system to a target position by a helicopter;
s4: opening a water valve, adjusting the angle of the insulating rod to enable the water outlet of the jet device to be opposite to the surface of the insulator, deicing, and closing the water valve after the current insulator deicing is finished; as shown in fig. 2, the switch of the water valve is arranged at the tail end of the hollow insulating rod, and the tail end is the end held by an operator, namely, the tail end is far away from the hollow insulating rod
S5: and the previous next deicing point enters step S4 until the deicing task is completed.
And determining a safety distance according to the length of the helicopter wing and the voltage grade of the power transmission line where the insulator to be deiced is located. When the power transmission lines with different voltage grades are deiced, the hollow insulating rod is stretched according to the requirements of the insulating distance and the safe flight distance of the helicopter, so that the safe distance between an operator and the power transmission line to be deiced is ensured; that is to say, when the deicing is carried out on the transmission lines with different voltage classes, the distance between the helicopter body and the transmission line is not less than 15m, and the distance between the edge of the helicopter wing and the transmission line is not less than the safety distance specified by the voltage classes, namely, the distance between the 110kV transmission line and the transmission line is not less than 1.5m, the distance between the 220kV transmission line and the transmission line is not less than 3m, and the distance between the 500kV transmission line and the transmission line is. The extension length of the hollow insulating rod is not less than 10m, and the sum of the length of the insulating rod and the effective jet distance of the water jet is not less than the distance between the helicopter body and the power transmission line. Or
When the power transmission line with a certain voltage class is deiced, the telescopic insulating rod is used for changing the deicing effect by changing the distance between the nozzle and the deicing line on the premise of meeting the safety distance. That is to say, when deicing transmission line voltage level confirms, on the premise of satisfying that the distance between helicopter organism and the transmission line is not less than 15m and helicopter wing and transmission line interval are not less than the safe distance of corresponding voltage level, through the length of flexible insulating rod, change deicing distance in the effective injection range of water jet to control deicing effect.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The utility model provides a hot water deicing system that is arranged in super high tension transmission line insulator which characterized in that: the method comprises the following steps: the system comprises hot water deicing equipment, a power supply for supplying working electricity to the hot water deicing equipment and a helicopter for carrying the hot water deicing equipment;
the hot water deicing equipment comprises pretreated water, a water tank for containing the pretreated water, a temperature control device for heating the pretreated water and controlling the water temperature within a preset temperature range, a supercharging device, a jet device and a power supply, wherein the power supply is used for supplying working electricity to the hot water deicing equipment, the supercharging device is used for supplying water flow with a preset pressure value to the jet device, the input end of the temperature control device is connected with the water outlet of the water tank, the output end of the temperature control device is connected with the water inlet end of the supercharging device, the water outlet end of the supercharging device is connected with the input end of the jet device through a high-pressure water pipe, and the high-pressure hot water output by the jet device removes ice coated on the surface of an insulator,
the pretreated water is distilled water which is distilled and condensed.
2. The hot water deicing system for insulators in extra-high voltage transmission lines according to claim 1, characterized in that: the pretreated water has an electrical conductivity of less than 1 x 10 when contacting the insulator-5S/cm of ionized water.
3. The hot water deicing system for insulators in extra-high voltage transmission lines according to claim 2, characterized in that: wherein the electrical conductivity gamma of the pre-treated water before heating is determined in the following manner,
wherein γ represents the conductivity of water at normal temperature, ktCoefficient of conversion, γ, representing the conductivity of water in contact with the insulator and before heatingtThe conductivity of the water in contact with the insulator is indicated and t represents the temperature.
4. The hot water deicing system for insulators in extra-high voltage transmission lines according to claim 1, characterized in that: the deicing system further comprises a telescopic hollow insulating rod, a high-pressure water pipe is arranged in the hollow insulating rod, and the minimum value of the diameter of the hollow insulating rod is larger than or equal to the diameter of the high-pressure water pipe.
5. The hot water deicing system for insulators in extra-high voltage transmission lines according to claim 4, characterized in that: the hollow insulating rod penetrates through the annular base fixedly connected with the helicopter.
6. The hot water deicing system for insulators in extra-high voltage transmission lines according to claim 5, characterized in that: and the support frame of the annular base is fixedly connected with a workbench which extends outwards from the helicopter cabin door.
7. The hot water deicing system for insulators in extra-high voltage transmission lines according to claim 1, characterized in that: the jet device at least comprises a conical straight nozzle, the conical straight nozzle comprises a conical contraction pipe and a cylindrical rectifying pipe, the left end of the conical contraction section is connected with the high-pressure water pipe, and the right end of the conical contraction pipe is connected with one end of the cylindrical rectifying pipe.
8. The hot water deicing system for insulators in extra-high voltage transmission lines according to claim 1, characterized in that: the high-pressure water pipe comprises a reinforcing layer and a heat insulation layer, the reinforcing layer is used for reinforcing the compressive strength of the high-pressure water pipe, and the heat insulation layer is used for insulating water flowing through the high-pressure water pipe.
9. A hot water deicing method for insulators in an extra-high voltage transmission line is used for the hot water deicing system as claimed in any one of claims 1 to 8, and is characterized in that: the method comprises the following steps:
s1: pretreating water for deicing the insulator;
s2: filling the pretreated water into a water tank, and heating the water in the water tank;
s3: after the water temperature in the water tank reaches a preset temperature, carrying a hot water deicing system to a target position by a helicopter;
s4: opening a water valve, adjusting the angle of the insulating rod to enable the water outlet of the jet device to be opposite to the surface of the insulator, deicing, and closing the water valve after the current insulator deicing is finished;
s5: and the previous next deicing point enters step S4 until the deicing task is completed.
10. The hot water deicing method for insulators in extra-high voltage transmission lines according to claim 9, characterized in that: step S3 includes: and determining a safety distance according to the length of the helicopter wing and the voltage grade of the power transmission line where the insulator to be deiced is located.
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| CN201911081098.7A CN110729691A (en) | 2019-11-07 | 2019-11-07 | Hot water deicing system and method for insulator in ultrahigh voltage transmission line |
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| CN201911081098.7A CN110729691A (en) | 2019-11-07 | 2019-11-07 | Hot water deicing system and method for insulator in ultrahigh voltage transmission line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116199340A (en) * | 2022-05-26 | 2023-06-02 | 北京新城禹潞环保科技有限责任公司 | Multiphase turbulent flow biomembrane sewage treatment equipment |
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| EP1378041A1 (en) * | 2001-04-11 | 2004-01-07 | Lars Berglund | A method and a device for removing ice and snow from a powerline |
| CN205194451U (en) * | 2015-11-05 | 2016-04-27 | 国家电网公司 | Be applied to defroster of insulator |
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Application publication date: 20200124 |