CN210427708U - Cable insulation detection device and system - Google Patents
Cable insulation detection device and system Download PDFInfo
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- CN210427708U CN210427708U CN201921337678.3U CN201921337678U CN210427708U CN 210427708 U CN210427708 U CN 210427708U CN 201921337678 U CN201921337678 U CN 201921337678U CN 210427708 U CN210427708 U CN 210427708U
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Abstract
The utility model provides a cable insulation detection device and system relates to power cable and detects technical field. The cable insulation detection device comprises a capacitance sensor and a test container, wherein immersion liquid is arranged in the test container, the capacitance sensor is sleeved on the surface of a cable to be detected and is electrically connected with an impedance analyzer, and the cable to be detected and the capacitance sensor are immersed in the immersion liquid; the capacitance sensor is used for generating a voltage signal when receiving a current signal provided by the impedance analyzer and sending the voltage signal to the impedance analyzer so that the impedance analyzer can calculate the capacitance of the insulating layer of the cable to be measured according to the voltage signal. The utility model provides a cable insulation detection device can make capacitive sensor's measuring result more accurate, and then can be accurate aassessment awaits measuring the insulating state of cable, provides effectual reference for power cable's change and maintenance.
Description
Technical Field
The utility model relates to a power cable detects technical field, particularly, relates to a cable insulation detection device and system.
Background
With the rapid development of electric utilities, the usage of power cables has changed tremendously. As a blood vessel of a city power supply system, a power cable plays an important role in transmitting electric energy required for production and living of a city. Once a power cable fails, the impact on city life is immeasurable. However, in the process of production and manufacture of the power cable, defects are inevitably introduced into the cable due to the limitation of the manufacturing process and the existence of additives, and in the process of long-term operation, due to the action of the external environment, the insulation of the cable is degraded in an accelerated manner, the defects are increased continuously, so that the insulation performance is greatly damaged, and huge economic loss is caused, which brings great hidden trouble to the safe and stable operation of a power system.
The capacitive sensor has the advantages of adjustable measurement signal intensity, low cost, simple structure and simple and convenient operation, and can be used for detecting the insulation state of the power cable, so that the capacitive sensor is widely concerned by experts at home and abroad, and a series of designs and researches are carried out on the capacitive sensor by a plurality of scholars. However, when the capacitive sensor is applied to insulation measurement of a cable, the capacitive sensor does not make perfect contact with the surface of the cable, and a cavity exists between the capacitive sensor and the surface of the cable. Due to the existence of the cavity, the distance between the capacitive sensor and the tested cable is changed, and then the lift-off effect is generated, so that the measurement result of the capacitive sensor is inaccurate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cable insulation detection device and system can eliminate carrying of the insulation measurement in-process of cable from the effect, and then improves capacitance sensor's measurement accuracy.
The utility model provides a technical scheme:
in a first aspect, an embodiment of the present invention provides a cable insulation detection device, including a capacitance sensor and a test container, where a immersion liquid is provided in the test container, the capacitance sensor is sleeved on a surface of a cable to be tested, the capacitance sensor is electrically connected with an impedance analyzer, and both the cable to be tested and the capacitance sensor are immersed in the immersion liquid; the capacitance sensor is used for generating a voltage signal when receiving a current signal provided by the impedance analyzer and sending the voltage signal to the impedance analyzer so that the impedance analyzer can calculate the capacitance of the insulating layer of the cable to be detected according to the voltage signal.
In an alternative embodiment, the dielectric constant of the immersion liquid is the same as or similar to the dielectric constant of the surface material of the cable to be tested.
In an optional implementation mode, the cable insulation detection device further comprises a clamp, and the capacitance sensor is fixedly sleeved on the surface of the cable to be detected through the clamp.
In optional embodiment, the clamp includes first fixed bed, second fixed bed and bolt, the second fixed bed is wrapping up first fixed bed, be provided with fixed ear on the second fixed bed, be provided with the fixed orifices on the fixed ear capacitance sensor passes through the fixed cover of clamp is established during the surface of the cable that awaits measuring, first fixed bed is kept away from the one side of second fixed bed with capacitance sensor's surface laminating, the bolt passes the fixed orifices is in order to incite somebody to action capacitance sensor fixes on the cable that awaits measuring.
In an alternative embodiment, the first fixing layer is made of a flexible material.
In an alternative embodiment, the first fixing layer is made of teflon, polyimide or pentaerythritol.
In an optional embodiment, the cable insulation detection apparatus further includes a debubbling processor, and the debubbling processor is connected to the test container; and the defoaming processor is used for defoaming the immersion liquid to obtain defoamed immersion liquid and conveying the defoamed immersion liquid to the test container.
In an optional embodiment, the defoaming processor comprises a liquid outlet pipe, and the defoaming processor is connected with the test container through the liquid outlet pipe.
In an alternative embodiment, the defoaming processor is an ultrasonic defoaming machine or a vacuum defoaming machine.
In a second aspect, an embodiment of the present invention provides a cable insulation detection system, which includes an impedance analyzer and a cable insulation detection device as described in any one of the foregoing embodiments.
The utility model provides a cable insulation detection device and system's beneficial effect is: through will await measuring cable and capacitive sensor immerse and measure in sinking the immersion liquid, the immersion liquid can fill capacitive sensor and the cavity between the cable that awaits measuring, thereby make cavity department become the dielectric constant that sinks the immersion liquid by the dielectric constant 1 of air, because electric capacity and dielectric constant are closely related, consequently can eliminate the influence of the air in the cavity to actual measurement electric capacity, make capacitive sensor's measuring result more accurate, and then the insulating state of the cable that awaits measuring of evaluation that can be accurate, change and maintenance for power cable provide effectual reference.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a cable insulation detection system according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a clamp according to an embodiment of the present invention;
fig. 3 is a diagram illustrating potential and electric field distribution of an air cavity according to an embodiment of the present invention;
fig. 4 is a diagram of the potential and electric field distribution of the immersion liquid filling cavity according to an embodiment of the present invention;
fig. 5 is a diagram of the potential and electric field distribution without cavity according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another cable insulation detection system according to an embodiment of the present invention.
Icon: 1-a cable insulation detection system; 10-cable insulation detection means; 11-a capacitive sensor; 12-a test container; 13-clamping hoop; 131-a first anchoring layer; 132-a second fixed layer; 133-bolt; 134-fixing ear; 135-fixing holes; 14-defoaming treatment machine; 141-liquid outlet pipe; 142-a liquid inlet pipe; 20-impedance analyzer; 2-cable to be tested.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and for simplicity of description, and do not indicate or imply that the equipment or components that are referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1, the present embodiment provides a cable insulation detection system 1, the cable insulation detection system 1 provided in the present embodiment includes an impedance analyzer 20 and a cable insulation detection device 10, the cable insulation detection device 10 includes a capacitance sensor 11 and a test container 12, a immersion liquid is disposed in the test container 12, the capacitance sensor 11 is sleeved on a surface of a cable to be detected 2, the capacitance sensor 11 is electrically connected to the impedance analyzer 20, and both the cable to be detected 2 and the capacitance sensor 11 are immersed in the immersion liquid.
In the present embodiment, the capacitance sensor 11 is configured to generate a voltage signal when receiving the current signal provided by the impedance analyzer 20, and send the voltage signal to the impedance analyzer 20, so that the impedance analyzer 20 calculates the capacitance of the cable 2 to be measured according to the voltage signal.
It is understood that after the capacitive sensor 11 and the cable 2 to be measured are immersed in the immersion liquid, the worker operates the impedance analyzer 20, the impedance analyzer 20 sends a current signal to the capacitive sensor 11 in response to the worker's operation, and the capacitive sensor 11 generates a voltage signal according to the current signal and sends the voltage signal to the impedance analyzer 20. The impedance analyzer 20 calculates the impedance of the cable 2 to be measured according to the voltage signal and the transmitted current signal, and then obtains the capacitance of the cable 2 to be measured. The staff can judge the insulation state of the cable 2 to be tested according to the capacitance of the cable 2 to be tested. For example, the capacitance range of a cable with good insulation state is a-b, and the capacitance range of a cable with substandard insulation state is c-d. If the value corresponding to the capacitance of the cable 2 to be measured calculated by the impedance analyzer 20 is within the range of a-b, it indicates that the insulation state of the cable 2 to be measured is good. If the value corresponding to the capacitance of the cable 2 to be measured, which is calculated by the impedance analyzer 20, is within the range of c-d, it indicates that the insulation state of the cable 2 to be measured does not reach the standard.
In this embodiment, the capacitance sensor 11 may be a planar capacitance sensor 11, and the planar capacitance sensor 11 includes an excitation electrode and a sensing electrode, which are respectively electrically connected to the impedance analyzer 20. The impedance analyzer 20 may be connected to the excitation electrode and the induction electrode through a clamp, and the joint of the clamp and the excitation electrode and the induction electrode may be wrapped by a sleeve, so that the clamp, the excitation electrode and the induction electrode are isolated from the immersion liquid. The impedance analyzer 20 is not affected by the immersion liquid when transmitting an electric signal to the capacitance sensor 11.
In this embodiment, the cable 2 to be tested and the capacitive sensor 11 can be immersed in immersion liquid during the test when the capacitive sensor 11 receives the current signal provided by the impedance analyzer 20 to perform the measurement. In another embodiment, the cable 2 and the capacitive sensor 11 may be removed from the test container 12 and then tested before the capacitive sensor 11 receives the current signal provided by the impedance analyzer 20 and performs the measurement.
In this embodiment, the dielectric constant of the immersion liquid is the same as or similar to the dielectric constant of the surface material of the cable 2 to be measured. And in order to fill the cavities on the surfaces of the capacitance sensor 11 and the cable 2 to be measured as much as possible, the smaller the viscosity of the immersion liquid is, the better the immersion liquid is, and the smaller the viscosity of the immersion liquid is, the more the immersion liquid can flow into the smaller cavities. Meanwhile, the immersion liquid also has the characteristics of no toxicity, no harm and no corrosion to the electrode of the capacitance sensor 11 and the surface of the cable 2 to be measured. Wherein, the deviation of the dielectric constant of the immersion liquid and the dielectric constant of the surface material of the cable 2 to be measured is close to be less than 0.5. For example, if the surface material of the cable 2 to be measured is polyvinyl chloride and the dielectric constant of the surface material of the cable 2 to be measured is 5, the value of the dielectric constant of the immersion liquid should be in the range of 4.5 to 5.5.
In this embodiment, in order to further improve the measurement accuracy of the capacitive sensor 11, before the capacitive sensor 11 is sleeved on the surface of the cable 2 to be measured, the electrodes of the capacitive sensor 11 and the cable 2 to be measured may be cleaned by using absolute ethyl alcohol or acetone, so as to remove the fat-soluble impurities on the surfaces of the electrodes of the capacitive sensor 11 and the cable 2 to be measured, which are not washed away by water. After the cleaning, the absolute ethyl alcohol or acetone adhered to the surface of the capacitance sensor 11 and the cable 2 to be measured can be removed by a blower.
Further, in this embodiment, the cable insulation detecting device 10 further includes a clamp 13, and the capacitive sensor 11 is fixedly sleeved on the surface of the cable 2 to be detected through the clamp 13.
Fig. 2 shows a schematic diagram of an implementable structure of the clamp 13. The clamp 13 comprises a first fixing layer 131, a second fixing layer 132 and a bolt 133, the second fixing layer 132 wraps the first fixing layer 131, a fixing lug 134 is arranged on the second fixing layer 132, a fixing hole 135 is formed in the fixing lug 134, when the capacitive sensor 11 is fixedly sleeved on the surface of the cable 2 to be tested through the clamp 13, one surface, far away from the second fixing layer 132, of the first fixing layer 131 is attached to the surface of the capacitive sensor 11, and the bolt 133 penetrates through the fixing hole 135 to fix the capacitive sensor 11 on the cable 2 to be tested.
It can be understood that after the surfaces of the capacitance sensor 11 and the cable 2 to be measured are cleaned by absolute ethyl alcohol or acetone, the capacitance sensor 11 and the cable 2 to be measured can be placed in the immersion liquid in the test container 12, then the electrode of the capacitance sensor 11 is attached to the outer surface of the cable 2 to be measured, the capacitance sensor 11 attached to the surface of the cable 2 to be measured is fixedly clamped by the clamp 13, so that the electrode of the capacitance sensor 11 is in close contact with the surface of the cable 2 to be measured, and accurate measurement is facilitated.
In another embodiment, after the surfaces of the capacitive sensor 11 and the cable 2 to be tested are cleaned by the absolute ethyl alcohol or acetone, the electrode of the capacitive sensor 11 may be attached to the outer surface of the cable 2 to be tested, the capacitive sensor 11 attached to the surface of the cable 2 to be tested is fixedly clamped by the clamp 13, so that the electrode of the capacitive sensor 11 is in close contact with the surface of the cable 2 to be tested, and then the capacitive sensor 11 and the cable 2 to be tested are placed in the immersion liquid in the test container 12.
In this embodiment, the first fixing layer 131 is made of a flexible material. Specifically, the first fixing layer 131 may be made of teflon, polyimide, or pentaerythritol. The second fixing layer 132 may be made of metal.
The first fixing layer 131 is made of a flexible material, so that the capacitive sensor 11 can be stressed uniformly under external pressure, electrodes of the capacitive sensor 11 are tightly attached to the surface of the cable 2 to be measured, and the size of the cavity is reduced.
As shown in fig. 3-5, three measurements of the measurement model constructed in the finite element simulation software COMSOL are shown. A minute cavity defect with a thickness of 0.02cm and a length of about 0.1cm is provided on the contact surface of the capacitance sensor 11 and the cable 2 to be measured, and dielectric materials with dielectric constants of 1 (i.e., the dielectric constant of air), 4.8 (i.e., the dielectric constant of immersion liquid), and 5 (and the dielectric constant of the polyvinyl chloride sheath of the cable 2 to be measured) are respectively provided in the cavity, so that potential and electric field distribution diagrams as shown in fig. 3-5 are obtained. As can be known from the electric potential and electric field distribution diagram of the air cavity shown in fig. 3, since the dielectric constant of the air in the cavity is greatly different from that of the polyvinyl chloride sheath of the cable 2 to be measured, the electric field lines generated when the capacitive sensor 11 performs measurement are not smooth curves, but are distorted, so that the measurement value of the capacitive sensor 11 is affected. As can be seen from the electric potential and electric field distribution diagram of the immersion liquid filled cavity shown in fig. 4 and the electric potential and electric field distribution diagram without the cavity shown in fig. 5, since the dielectric constant of the immersion liquid filled in the cavity is close to the dielectric constant of the polyvinyl chloride sheath of the cable 2 to be measured, the electric field lines generated when the capacitance sensor 11 performs measurement are not substantially distorted, so that the measurement value of the capacitance sensor 11 is not affected. It can be seen that the cable insulation detection device 10 provided by the embodiment can indirectly eliminate the cavity between the capacitive sensor 11 and the cable 2 to be measured through the immersion liquid, and can also directly reduce the cavity between the capacitive sensor 11 and the cable 2 to be measured through the clamp 13, so that the influence of air in the cavity on actual measurement can be weakened, and the measurement accuracy of the capacitive sensor 11 can be improved.
As shown in fig. 6, which is a schematic structural diagram of another cable insulation detecting system 1 provided in this embodiment, in the cable insulation detecting system 1, in addition to the cable insulation detecting system 1 shown in fig. 1, the cable insulation detecting apparatus 10 further includes a defoaming processor 14, and the defoaming processor 14 is connected to the testing container 12. The defoaming processor 14 is configured to perform a defoaming process on the immersion liquid to obtain a defoamed immersion liquid, and to convey the defoamed immersion liquid to the test container 12.
In the present embodiment, the defoaming processor 14 performs the defoaming processing on the immersion liquid, and can extract the bubbles in the immersion liquid, thereby further improving the measurement accuracy of the capacitance sensor 11.
In this embodiment, the defoaming processor 14 includes a liquid outlet duct 141, the defoaming processor 14 is connected to the test container 12 through the liquid outlet duct 141, and the defoaming processor 14 conveys the defoaming-processed immersion liquid to the test container 12 through the liquid outlet duct 141.
Further, in this embodiment, defoaming processor 14 further includes a liquid inlet pipe 142, and the untreated immersion liquid is conveyed to defoaming processor 14 through liquid inlet pipe 142 to be defoamed.
In this embodiment, an ultrasonic defoaming machine or a vacuum defoaming machine may be used as defoaming processor 14. An ultrasonic defoaming machine is preferably adopted, and the working principle of the ultrasonic defoaming machine is as follows: after the ultrasonic defoaming machine receives the high-frequency high-voltage power supply, the ultrasonic vibrator of the ultrasonic defoaming machine can generate high-frequency vibration, the high-frequency vibration can generate cavitation in immersion liquid, and the cavitation can generate impact force, so that gas dissolved in the immersion liquid can be crushed and separated.
To sum up, the embodiment of the present invention provides a cable insulation detection device and system, the cable insulation detection device includes a capacitance sensor and a test container, a immersion liquid is disposed in the test container, the capacitance sensor is sleeved on the surface of a cable to be tested, the capacitance sensor is electrically connected to an impedance analyzer, and both the cable to be tested and the capacitance sensor are immersed in the immersion liquid; the capacitance sensor is used for generating a voltage signal when receiving a current signal provided by the impedance analyzer and sending the voltage signal to the impedance analyzer so that the impedance analyzer can calculate the capacitance of the insulating layer of the cable to be measured according to the voltage signal. Through will await measuring cable and capacitive sensor immerse and measure in sinking the immersion liquid, the immersion liquid can fill capacitive sensor and the cavity between the cable that awaits measuring, thereby make cavity department become the dielectric constant that sinks the immersion liquid by the dielectric constant 1 of air, because electric capacity and dielectric constant are closely related, consequently can eliminate the influence of the air in the cavity to actual measurement electric capacity, make capacitive sensor's measuring result more accurate, and then the insulating state of the cable that awaits measuring of evaluation that can be accurate, change and maintenance for power cable provide effectual reference.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cable insulation detection device is characterized by comprising a capacitance sensor and a test container, wherein immersion liquid is arranged in the test container, the capacitance sensor is sleeved on the surface of a cable to be detected, the capacitance sensor is electrically connected with an impedance analyzer, and the cable to be detected and the capacitance sensor are both immersed in the immersion liquid;
the capacitance sensor is used for generating a voltage signal when receiving a current signal provided by the impedance analyzer and sending the voltage signal to the impedance analyzer, so that the impedance analyzer can calculate the capacitance of the cable to be measured according to the voltage signal.
2. The cable insulation detection device according to claim 1, wherein a dielectric constant of the immersion liquid is the same as or similar to a dielectric constant of a surface material of the cable to be measured.
3. The apparatus of claim 1, further comprising a clamp, wherein the capacitive sensor is secured to the surface of the cable by the clamp.
4. The cable insulation detecting device according to claim 3, wherein the clamp includes a first fixing layer, a second fixing layer, and a bolt, the second fixing layer covers the first fixing layer, a fixing lug is disposed on the second fixing layer, a fixing hole is disposed on the fixing lug, when the capacitive sensor is fixed on the surface of the cable to be detected through the clamp, one surface of the first fixing layer, which is far away from the second fixing layer, is attached to the surface of the capacitive sensor, and the bolt passes through the fixing hole to fix the capacitive sensor on the cable to be detected.
5. The apparatus of claim 4, wherein the first fixing layer is made of a flexible material.
6. The cable insulation detection device of claim 5, wherein the first fixing layer is made of polytetrafluoroethylene, polyimide or pentaerythritol.
7. The cable insulation detection apparatus according to claim 1, further comprising a defoaming processor connected to the test container;
and the defoaming processor is used for defoaming the immersion liquid to obtain defoamed immersion liquid and conveying the defoamed immersion liquid to the test container.
8. The cable insulation detecting apparatus according to claim 7, wherein the defoaming processor includes a liquid outlet duct, and the defoaming processor is connected to the test container through the liquid outlet duct.
9. The cable insulation detection device according to claim 7, wherein the defoaming processor is an ultrasonic defoaming machine or a vacuum defoaming machine.
10. A cable insulation detection system comprising an impedance analyzer and a cable insulation detection device according to any one of claims 1-9.
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|---|---|---|---|
| CN201921337678.3U CN210427708U (en) | 2019-08-16 | 2019-08-16 | Cable insulation detection device and system |
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| CN201921337678.3U CN210427708U (en) | 2019-08-16 | 2019-08-16 | Cable insulation detection device and system |
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| CN210427708U true CN210427708U (en) | 2020-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766485A (en) * | 2020-07-20 | 2020-10-13 | 国网新疆电力有限公司乌鲁木齐供电公司 | Capacitive sensor for cable insulation detection and method of use thereof |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766485A (en) * | 2020-07-20 | 2020-10-13 | 国网新疆电力有限公司乌鲁木齐供电公司 | Capacitive sensor for cable insulation detection and method of use thereof |
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Effective date of registration: 20210610 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China South Power Grid International Co.,Ltd. Address before: 1-2 / F, building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou, Guangdong 510000 Patentee before: POWER GRID TECHNOLOGY RESEARCH CENTER. CHINA SOUTHERN POWER GRID |
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