CN110703136A - Live detection device and method for leakage current of insulator of power transmission line - Google Patents
Live detection device and method for leakage current of insulator of power transmission line Download PDFInfo
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- CN110703136A CN110703136A CN201911001941.6A CN201911001941A CN110703136A CN 110703136 A CN110703136 A CN 110703136A CN 201911001941 A CN201911001941 A CN 201911001941A CN 110703136 A CN110703136 A CN 110703136A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The invention provides a live detection device for leakage current of an insulator of a power transmission line, which comprises a leakage current acquisition unit and a portable leakage current measurement unit, wherein the leakage current acquisition unit comprises a current acquisition element, an insulated wire and an interface unit, the current acquisition element is arranged on the insulator or a hardware tool for connecting the insulator string and an iron tower, the current acquisition element is used for acquiring the leakage current of the insulator, the insulated wire is wound, adhered and fixed on the iron tower, one end of the insulated wire is electrically connected with the current acquisition element, the portable leakage current measurement unit is suitable for being fixed on the iron tower of the power transmission line and connecting a grounding end with the iron tower during detection, and the input end of the portable leakage current measurement unit is electrically connected with the other end of. The invention also provides a live detection method for the leakage current of the insulator of the power transmission line. According to the method and the device, all insulator strings on the iron tower can be measured only by one portable leakage current measuring unit, so that the efficiency is high, and the cost is low.
Description
Technical Field
The invention relates to the technical field of electric power system overhead transmission line filth live detection, in particular to a live detection device and method for leakage current of an insulator of a transmission line.
Background
The transmission line insulator is long-time at outdoor work, and the electric performance descends seriously after the filthy surface adhesion, meets bad weather and can take place the pollution flashover accident, in case the pollution flashover takes place, probably causes the large tracts of land power failure accident, causes serious influence to big electric wire netting steady operation, seriously influences people's production life simultaneously. In order to prevent the occurrence of pollution flashover accidents, it is necessary to know the pollution condition on the surface of the outdoor insulator and determine whether to perform cleaning work on the insulator. The leakage current of the insulator is the comprehensive reflection of factors such as voltage, pollution, environmental conditions and the like, and practical operation experience shows that: the leakage current can provide more effective information reflecting the operation state of the insulator and can be used as a dynamic parameter for evaluating the operation state of the insulator and the pollution state of the environment where the insulator is located. Therefore, through the measurement of the leakage current of the insulator, a mathematical statistics method is applied to establish a function expression between the leakage current characteristic value and the influence factors, so that the pollution state of the operating environment of the insulator is comprehensively evaluated, and the method has important scientific guiding significance and engineering application value for the design and operation of the power transmission line.
The traditional method for measuring the pollution level of the insulator firstly needs to take down part or the whole string of insulators and then tests to judge the pollution level of the insulator. The inventor of the invention discovers through research that the current insulator online monitoring device works outdoors for a long time, the leakage current obtained by measurement under the condition of dryness or low pollution degree is relatively weak, the error is large, and the real pollution information on the surface of the insulator is difficult to reflect, so that the measurement condition is harsh and various faults are easy to occur; meanwhile, each insulator string needs a special online monitoring device to acquire leakage current information of the insulator string, and the online monitoring device needs an energy supply device, so that the manufacturing cost is high, the engineering quantity is large, the problem cannot be solved in time when a fault occurs, and the requirement for development of a smart power grid cannot be met.
Disclosure of Invention
The invention provides a live detection device for leakage current of an insulator of a power transmission line, aiming at the technical problems that the existing insulator online monitoring device works outdoors for a long time, the leakage current obtained by measurement is relatively weak under the condition of dryness or low pollution degree, the error is large, and the real pollution information on the surface of an insulator is difficult to reflect, so the measurement condition is harsh, meanwhile, each string of insulators needs an online monitoring device to obtain the leakage current information of an insulator string, and the online monitoring device needs an energy supply device, so the manufacturing cost is high.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides an electrified detection device of transmission line insulator leakage current, includes leakage current acquisition unit and portable leakage current measuring unit, leakage current acquisition unit includes current acquisition element, insulated wire and interface unit, current acquisition element sets up on the insulator or sets up on the gold utensil that insulator string and iron tower are connected, current acquisition element is used for gathering insulator leakage current, the insulated wire winding is pasted and is fixed on the iron tower, insulated wire one end is connected with the current acquisition element electricity, portable leakage current measuring unit is suitable for when detecting to fix on the transmission line iron tower and is connected the earthing terminal with the iron tower, just portable leakage current measuring unit's input passes through interface unit and is connected with the insulated wire other end electricity.
Further, the current collecting element is a circular ring-shaped soft conductor, the circular ring-shaped soft conductor is tightly attached to the surface, close to the low-voltage side insulator upper disc, of the insulator string, and the upper surface of the insulator is evenly divided into two parts.
Furthermore, the circle-shaped soft conductor is made of conductive sponge or flexible conductor materials.
Further, the current collecting element is a precision resistor, and the precision resistor is connected in series with a hardware fitting for connecting the insulator string and the iron tower.
Furthermore, one end of the insulated wire is electrically connected with the high-voltage side of the precision resistor, and the insulated wire is wound, adhered and fixed on the iron tower and the hardware fitting.
Further, the precision resistor is a non-inductive resistor of 1-50 omega.
Further, the current collecting element is a Rogowski coil, and the Rogowski coil is fixedly connected to the iron tower through a fixing support rod and surrounds a hardware tool for connecting the insulator string and the iron tower.
Compared with the prior art, the live detection device for the leakage current of the insulator of the power transmission line has the following technical advantages:
1. this detection device can be used to the staff and use when overhauing the circuit, need not to spend a large amount of energy, only need during the measurement with portable leakage current measuring unit install on the iron tower, the connection port is measurable quantity promptly, easy operation just consumes the resource fewly, and the insulator surface filthy state information that obtains is accurate, can not produce great error because of the leakage current undersize, can effectively reflect the filthy state on insulator surface, and effectively judge whether to carry out the ash removal work to the insulator, and portable leakage current measuring unit only need one just can measure to all insulator chains on the iron tower, not only high-efficient but also the cost is lower.
2. The leakage current acquisition unit in the detection device does not need power supply, the problem of energy supply of the online detection device is solved, the price is low, the leakage current acquisition unit can be mounted and applied on a large number of power transmission lines, the leakage current measurement unit is of a portable structure, leakage current information of all insulator strings on an iron tower can be acquired by only one device, the pollution condition of the insulator can be effectively evaluated according to the leakage current characteristic value, effective reference can be provided for pollution prevention and control of a power system, and the stability and reliability of power supply are guaranteed.
The invention also provides a live detection method for the leakage current of the insulator of the power transmission line, which is used for detecting according to the live detection device for the leakage current of the insulator of the power transmission line and comprises the following steps:
s1, fixedly mounting the portable leakage current measuring unit on a transmission line iron tower, and connecting the grounding end of the portable leakage current measuring unit with the iron tower;
s2, electrically connecting the other end of the insulated wire with the input end of the portable leakage current measuring unit through an interface unit;
s3, spraying the insulator by using an insulating operating rod or an unmanned aerial vehicle loaded with a spraying device with deionized water, and stopping spraying operation when the surface of the insulator is completely wet and a small amount of water drops are about to fall but do not fall;
s4, measuring the leakage current of the insulator through the portable leakage current measuring unit, and recording the characteristic value of the leakage current obtained under the condition that the surface of the insulator is completely wetted;
and S5, comparing the obtained leakage current characteristic value with a leakage current characteristic value obtained in advance by an artificial pollution test under the same voltage and insulator wetting conditions, finding the closest insulator pollution degree corresponding to the obtained leakage current characteristic value in a preset pollution table, and determining the current pollution level of the insulator string.
Further, the spraying device in the step S3 is a watering can.
Further, the spraying mode in the step S3 is to spray from the upper part to the lower part of the insulator string, and the spraying is not too much each time, and after the insulator string is sprayed once from top to bottom, if the insulator string is not completely wetted, the spraying is repeated in the order from top to bottom until the surface of the insulator string is completely wetted.
Compared with the prior art, the live detection device and method for the leakage current of the insulator of the power transmission line can detect the leakage current of the insulator of the power transmission line in the running state or under the live condition of the insulator, avoid power failure, are convenient to operate, can be implemented simultaneously by matching with zero-value detection work of the insulator of the power transmission line, reduce workload, estimate the pollution level according to the obtained leakage current on the surface of the insulator, obtain the real pollution information of the insulator and do not need to consider the influence of environment humidity on the leakage current.
Drawings
Fig. 1 is a schematic diagram of the detection principle of the live detection device for the leakage current of the insulator of the power transmission line provided by the invention.
Fig. 2 is a schematic view of an installation structure of a live detection device for leakage current of an insulator of a power transmission line provided by the invention.
Fig. 3 is a schematic top view of the soft conductor of fig. 2 arranged on the top of the insulator.
Fig. 4 is a schematic view of another installation structure of the live detection device for the leakage current of the insulator of the power transmission line provided by the invention.
Fig. 5 is a schematic view of an installation structure of another live detection device for leakage current of an insulator of a power transmission line provided by the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present invention provides a live detection apparatus for leakage current of an insulator of a power transmission line, including a leakage current collection unit and a portable leakage current measurement unit, where the leakage current collection unit includes a current collection element, an insulated wire and an interface unit, the current collection element is disposed on the insulator or on a hardware fitting connecting an insulator string and an iron tower, the current collection element is used to collect leakage current of the insulator, the insulated wire is wound and adhered to the iron tower, one end of the insulated wire is electrically connected with the current collection element, the insulated wire is formed by tightly and uniformly wrapping a wire with an insulating material, the portable leakage current measurement unit is adapted to be fixed on the iron tower of the power transmission line and connect a ground terminal with the iron tower during detection, and an input end of the portable leakage current measurement unit is electrically connected with the other end of the insulated wire through the interface unit, the portable leakage current measuring unit is mounted on the iron tower only when being detected and is connected with the insulated wire through the interface unit, and the portable leakage current measuring unit can be formed by an acquisition circuit and a processing circuit in the existing 'insulator leakage current monitoring system', namely the specific structure of the portable leakage current measuring unit belongs to the prior art well known by technical personnel in the field; the interface unit can be realized by using an existing RS-232 or RS-485 interface.
As a specific example, please refer to fig. 2 and 3, the current collecting element is a circular ring-shaped soft conductor, and the circular ring-shaped soft conductor is closely attached to the surface of the insulator upper disc near the low-voltage side (i.e. the side of the iron tower) of the insulator string, and divides the insulator upper surface into two parts. During measurement, a part of the upper disc surface of the insulator is short-circuited by using the circular soft conductor, and leakage current flows out of the circular soft conductor to form a loop; when the leakage current is not required to be measured, the lead interface of the insulated wire is suspended to enable the insulator string to work normally.
As a preferred embodiment, the circle-shaped soft conductor is made of a conductive sponge or a flexible conductor material, so that the circle-shaped soft conductor can be popularized in a large amount due to low cost.
In a preferred embodiment, the diameter of the circular soft conductor is about 10 mm.
As a specific embodiment, please refer to fig. 4, where the current collecting element is a precision resistor, the precision resistor is connected in series to a hardware fitting connecting the insulator string and the iron tower, that is, two ends of the precision resistor are connected to the hardware fitting, an upper end hardware fitting is suspended on the iron tower, a lower end hardware fitting is suspended on the insulator string, and during measurement, U-I conversion can be performed through voltages at two ends of the precision resistor to obtain a leakage current characteristic value. The precision resistor in the example needs to be connected in series on the hardware fitting for connecting the insulator string and the iron tower, so that the precision resistor needs to be added in the middle of the insulator connecting the iron tower before the iron tower insulator is erected, two ends of the precision resistor can be welded on the hardware fitting, and the low-voltage side insulator steel cap on the insulator string is sequentially connected in series with the hardware fitting, the precision resistor, the hardware fitting and the iron tower, so that the precision resistor connection mode in the example is particularly suitable for a newly-built iron tower.
As a specific embodiment, one end of the insulated conductor is electrically connected with a high-voltage side (i.e. a lower end hardware fitting side) of the precision resistor, and the insulated conductor is wound, adhered and fixed on the iron tower and the hardware fitting, i.e. the insulated conductor is simultaneously wound, adhered and fixed on the iron tower and the lower end hardware fitting, so that the insulated conductor can be more stably fixed on the iron tower.
As a specific embodiment, the precision resistor is a non-inductive resistor of 1-50 Ω, which has a small inductance value, a strong overload capability and a high mechanical strength, the small resistor can collect a large leakage current, the large resistor can collect a small leakage current, and if the signal-to-noise ratio of the leakage current is low, the resistance value of the non-inductive resistor can be properly increased, so that the method is very suitable for collecting the leakage current of the insulator.
As a specific embodiment, please refer to fig. 5, the current collecting element is a rogowski coil, the rogowski coil is fixedly connected to an iron tower through fixing support rods and surrounds a hardware tool for connecting an insulator string and the iron tower, the rogowski coil is fixedly connected to the iron tower through two fixing support rods which are oppositely configured, so that stability of the rogowski coil is maintained, and a rogowski coil leading-out port is used for leading leakage current into the portable leakage current measuring unit through an insulated wire, so that the size of the leakage current can be directly obtained.
Compared with the prior art, the live detection device for the leakage current of the insulator of the power transmission line has the following technical advantages:
1. this detection device can be used to the staff and use when overhauing the circuit, need not to spend a large amount of energy, only need during the measurement with portable leakage current measuring unit install on the iron tower, the connection port is measurable quantity promptly, easy operation just consumes the resource fewly, and the insulator surface filthy state information that obtains is accurate, can not produce great error because of the leakage current undersize, can effectively reflect the filthy state on insulator surface, and effectively judge whether to carry out the ash removal work to the insulator, and portable leakage current measuring unit only need one just can measure to all insulator chains on the iron tower, not only high-efficient but also the cost is lower.
2. The leakage current acquisition unit in the detection device does not need power supply, the problem of energy supply of the online detection device is solved, the price is low, the leakage current acquisition unit can be mounted and applied on a large number of power transmission lines, the leakage current measurement unit is of a portable structure, leakage current information of all insulator strings on an iron tower can be acquired by only one device, the pollution condition of the insulator can be effectively evaluated according to the leakage current characteristic value, effective reference can be provided for pollution prevention and control of a power system, and the stability and reliability of power supply are guaranteed.
The invention also provides a live detection method for the leakage current of the insulator of the power transmission line, which is used for detecting according to the live detection device for the leakage current of the insulator of the power transmission line and comprises the following steps:
s1, fixedly installing the portable leakage current measuring unit on an iron tower of the power transmission line, connecting the grounding end of the portable leakage current measuring unit with the iron tower, and connecting the portable leakage current measuring unit with the ground through the iron tower to be effectively grounded;
s2, electrically connecting the other end of the insulated wire with the input end of the portable leakage current measuring unit through the interface unit, so that the power transmission line, the leakage current collecting unit, the insulated wire, the interface unit, the portable leakage current measuring unit and the ground form an effective closed loop;
s3, spraying the insulator by using an existing spraying device with deionized water (such as conductivity less than 15 muS/cm and temperature 20 ℃) loaded by an insulating operating rod or an unmanned aerial vehicle, wherein the specific spraying mode is not limited, and when the surface of the insulator is completely wet and a small amount of water drops are about to fall but do not fall, the spraying operation is stopped;
s4, measuring the leakage current of the insulator through the portable leakage current measuring unit, and recording the characteristic value of the leakage current, such as the maximum value or the effective value, obtained under the condition that the surface of the insulator is completely wetted;
and S5, comparing the obtained leakage current characteristic value with a leakage current characteristic value obtained in advance by an artificial pollution test under the same voltage and insulator wetting conditions, finding the insulator pollution degree corresponding to the closest pre-obtained leakage current characteristic value in a preset pollution table, determining the current pollution level of the insulator string, and judging whether dust removal work needs to be arranged. Specifically, in the detection method, a pollution meter corresponding to a preset leakage current characteristic value and an insulator pollution degree is manufactured in advance, the measured leakage current characteristic value is compared with the preset leakage current characteristic value, the insulator pollution degree corresponding to the measured leakage current characteristic value which is closest to the preset leakage current characteristic value can be checked in the pollution meter, and the pollution level on the surface of the insulator can be determined according to the pollution degree, namely the larger the pollution degree is, the higher the pollution level on the surface of the insulator is, and otherwise, the smaller the pollution degree is, the lower the pollution level on the surface of the insulator is, so that whether the work of removing dust on the surface of the insulator needs to be arranged or not can be judged.
As a specific example, the spraying device in step S3 is a watering can, that is, water is sprayed in the form of fine water particles by a watering can well known to those skilled in the art.
In a preferred embodiment, the spraying manner in step S3 is to spray from the upper part to the lower part of the insulator string, and it is not preferable to spray too much each time, and after spraying once from top to bottom, if the insulator string is not completely wetted, the spraying is repeated in the order from top to bottom until the surface of the insulator string is completely wetted.
Compared with the prior art, the live detection device and method for the leakage current of the insulator of the power transmission line can detect the leakage current of the insulator of the power transmission line in the running state or under the live condition of the insulator, avoid power failure, are convenient to operate, can be implemented simultaneously by matching with zero-value detection work of the insulator of the power transmission line, reduce workload, estimate the pollution level according to the obtained leakage current on the surface of the insulator, obtain the real pollution information of the insulator and do not need to consider the influence of environment humidity on the leakage current.
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 an electrified detection device of transmission line insulator leakage current, includes leakage current acquisition unit and portable leakage current measuring unit, its characterized in that, leakage current acquisition unit includes current acquisition element, insulated wire and interface unit, current acquisition element sets up on the insulator or sets up on the gold utensil that insulator string and iron tower are connected, current acquisition element is used for gathering insulator leakage current, insulated wire winding is pasted and is fixed on the iron tower, insulated wire one end is connected with current acquisition element electricity, portable leakage current measuring unit is suitable for when detecting to fix on the transmission line iron tower and be connected earthing terminal and iron tower, just portable leakage current measuring unit's input passes through interface unit and is connected with the insulated wire other end electricity.
2. The live detection device for the leakage current of the insulator of the power transmission line according to claim 1, wherein the current collection element is a circular ring-shaped soft conductor, and the circular ring-shaped soft conductor is tightly attached to the surface of the insulator string close to the upper disc of the insulator on the low-voltage side and uniformly divides the upper surface of the insulator into two parts.
3. The live detection device for the leakage current of the insulator of the power transmission line according to claim 2, wherein the circular soft conductor is made of a conductive sponge or a flexible conductor.
4. The live detection device for the leakage current of the insulator of the power transmission line according to claim 1, wherein the current collection element is a precision resistor, and the precision resistor is connected in series with a hardware tool for connecting the insulator string and the iron tower.
5. The live detection device for the leakage current of the insulator of the power transmission line according to claim 4, wherein one end of the insulated wire is electrically connected with the high-voltage side of the precision resistor, and the insulated wire is wound, adhered and fixed on an iron tower and a hardware fitting.
6. The live detection device for the leakage current of the insulator of the power transmission line according to claim 4, wherein the precision resistor is a non-inductive resistor of 1-50 Ω.
7. The live detection device for the leakage current of the insulator of the power transmission line according to claim 1, wherein the current collection element is a rogowski coil, and the rogowski coil is fixedly connected to an iron tower through a fixing support rod and surrounds a hardware tool for connecting the insulator string and the iron tower.
8. An electrified detection method for leakage current of an insulator of a power transmission line, which is characterized by being detected according to the electrified detection device for leakage current of the insulator of the power transmission line of any one of claims 1-7, and comprising the following steps:
s1, fixedly mounting the portable leakage current measuring unit on a transmission line iron tower, and connecting the grounding end of the portable leakage current measuring unit with the iron tower;
s2, electrically connecting the other end of the insulated wire with the input end of the portable leakage current measuring unit through an interface unit;
s3, spraying the insulator by using an insulating operating rod or an unmanned aerial vehicle loaded with a spraying device with deionized water, and stopping spraying operation when the surface of the insulator is completely wet and a small amount of water drops are about to fall but do not fall;
s4, measuring the leakage current of the insulator through the portable leakage current measuring unit, and recording the characteristic value of the leakage current obtained under the condition that the surface of the insulator is completely wetted;
and S5, comparing the obtained leakage current characteristic value with a leakage current characteristic value obtained in advance by an artificial pollution test under the same voltage and insulator wetting conditions, finding the closest insulator pollution degree corresponding to the obtained leakage current characteristic value in a preset pollution table, and determining the current pollution level of the insulator string.
9. The live detection method for the leakage current of the insulator of the power transmission line according to claim 8, wherein the spraying device in the step S3 is a watering can.
10. The live detection method for the leakage current of the insulator of the power transmission line according to claim 8, wherein the spraying manner in the step S3 is spraying from the upper part to the lower part of the insulator string, and after the insulator string is sprayed once from top to bottom, if the insulator string is not completely wetted, the spraying is repeated in the order from top to bottom until the surface of the insulator string is completely wetted.
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| CN111796206A (en) * | 2020-07-08 | 2020-10-20 | 广东电网有限责任公司 | Periscope type electric leakage observation device |
| CN112290451A (en) * | 2020-10-23 | 2021-01-29 | 广东电网有限责任公司广州供电局 | Power transmission line clamp heating detection cooling system and method |
| CN112620879A (en) * | 2020-12-04 | 2021-04-09 | 江苏科技大学 | Detection system and method for evaluating leakage current of underwater welding/cutting arc |
| CN113484707A (en) * | 2021-07-14 | 2021-10-08 | 云南电网有限责任公司电力科学研究院 | High-voltage pole and tower insulation fault finding device and method |
| CN113504441A (en) * | 2021-07-14 | 2021-10-15 | 云南电网有限责任公司电力科学研究院 | High-voltage pole and tower insulation fault monitoring and positioning sensor and design method |
| CN116643205A (en) * | 2023-05-24 | 2023-08-25 | 湖南城市学院 | Leakage current detection method, system and medium for power transmission circuit |
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