CN110763348A - Cable joint temperature monitoring device and system - Google Patents
Cable joint temperature monitoring device and system Download PDFInfo
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- CN110763348A CN110763348A CN201911087105.4A CN201911087105A CN110763348A CN 110763348 A CN110763348 A CN 110763348A CN 201911087105 A CN201911087105 A CN 201911087105A CN 110763348 A CN110763348 A CN 110763348A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The invention provides a cable joint temperature monitoring device and a system, wherein the device comprises: the temperature detection module, the cable branch box and the monitoring module; the cable distribution box is used for integrating and butting and installing cables, and a cable joint is generated at a cable connection position; the monitoring module is arranged in the cable distribution box, the temperature detection module is connected with the monitoring module, the temperature detection module is used for being arranged at the cable joint, the temperature detection module is used for detecting the temperature information of the cable joint and sending the temperature information to the monitoring module, and the monitoring module is used for outputting an alarm signal according to the temperature information.
Description
Technical Field
The invention relates to the technical field of power distribution network detection, in particular to a cable joint temperature monitoring device and system.
Background
With the further increase of the investment of the country to the power industry and the further deepening of the urban network transformation work, the power cable is more and more widely applied. In recent years, with the rapid development of economy and the continuous promotion of power grid construction, high-voltage cable networks have slowly replaced overhead lines to become the main power supply mode for governments, transportation hubs, commercial districts and large residential districts.
However, with the increase of the usage amount of the cable, the cable is too dense in the channel, and the dissipated heat cannot be rapidly conducted to the outside in the peak period of electricity utilization in two seasons of summer and winter, so that the accident rate of the cable is increased when the cable runs in a high-temperature environment for a long time, and the service life of the cable is also influenced. Meanwhile, the rough construction in the cable operation and maintenance process often brings about short-circuit explosion and large-area power failure accidents of the operating cable, so that the first-aid repair and recovery difficulty is high, and the power consumption of common people is also damaged.
The cable joint is one of weak links in the safe operation of the power distribution network in urban areas, most of the reasons for causing the cable joint faults are caused by the fact that the operation process is not standard, and the cable joint faults mainly appear in that the contact resistance is increased in the operation process of the cable joint, so that the temperature of the cable joint is increased, the fire accident is further caused, and potential safety hazards exist.
Disclosure of Invention
Therefore, it is necessary to provide a cable joint temperature monitoring device and system for solving the problems of abnormal cable joint temperature, easy fire accidents and potential safety hazards.
A cable splice temperature monitoring device comprising: the temperature detection module, the cable branch box and the monitoring module; the cable distribution box is used for integrating and butting and installing cables, and a cable joint is generated at the cable connection position; the monitoring module set up in the cable junction box, temperature detection module with monitoring module connects, temperature detection module be used for set up in cable joint department, temperature detection module is used for detecting cable joint's temperature information, and with temperature information sends to monitoring module, monitoring module is used for the basis temperature information, output alarm signal.
Foretell cable joint temperature monitoring devices integrates and the butt joint installation to the cable through setting up cable branch box, so that cable junction produces cable joint, temperature detection module set up in cable joint department, in order to detect cable joint's temperature information is in order to realize the detection to cable joint temperature, works as when monitoring module detects cable joint's temperature and is greater than and predetermines the threshold value, sends the warning suggestion to the staff in time detects and maintains the cable, in order to avoid the sending of fire incident.
In one embodiment, the monitoring module is configured to output the alarm signal when detecting that the temperature information is greater than a preset threshold.
In one embodiment, the temperature detection module is a temperature sensor.
In one embodiment, the cable joint temperature monitoring device further comprises a power supply module, wherein the power supply module is connected with the monitoring module, and the power supply module is used for supplying power to the monitoring module.
In one embodiment, the power supply module includes an induction coil and a rectifying and filtering unit, the induction coil is coupled to the cable, the rectifying and filtering unit is connected to the induction coil and the monitoring module, respectively, the induction coil is configured to obtain electric energy from the cable, process the electric energy through the rectifying and filtering unit, and transmit the electric energy to the monitoring module to supply power to the monitoring module.
In one embodiment, the power supply module further includes a super capacitor, and the super capacitor is connected to the rectifying and filtering unit.
A cable joint temperature monitoring system comprising a cable joint temperature monitoring device as described in any one of the above embodiments.
The cable joint temperature monitoring system integrates and butt-joints cables through the cable branch box, so that the cable joint is generated at the cable joint, the temperature detection module is arranged at the cable joint to detect the temperature information of the cable joint so as to realize the detection of the temperature of the cable joint, and when the temperature detected by the monitoring module at the cable joint is higher than a preset threshold value, an alarm prompt is sent out, so that a worker can timely detect and maintain the cables to avoid the sending of fire accidents.
In one embodiment, the cable joint temperature monitoring system further comprises a service terminal; the service terminal is connected with the monitoring module, and the monitoring module is used for sending the temperature information to the service terminal.
In one embodiment, the service terminal is configured to analyze the temperature information according to historical data of the cable joint to obtain an operating state of the cable joint.
In one embodiment, the historical data of the cable joint includes historical temperature information of the cable joint and corresponding historical operating states.
Drawings
FIG. 1 is a block diagram of a cable connector temperature monitoring device according to an embodiment of the present invention;
FIG. 2 is a block diagram of the power module according to an embodiment of the present invention;
fig. 3 is a block diagram of a cable joint temperature monitoring system according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
For example, a cable joint temperature monitoring device includes: the temperature detection module, the cable branch box and the monitoring module; the cable distribution box is used for integrating and butting and installing cables, and a cable joint is generated at the cable connection position; the monitoring module set up in the cable junction box, temperature detection module with monitoring module connects, temperature detection module be used for set up in cable joint department, temperature detection module is used for detecting cable joint's temperature information, and with temperature information send to monitoring module, monitoring module is used for when detecting temperature information surpasss and predetermines the threshold value, output alarm signal.
Foretell cable joint temperature monitoring devices integrates and the butt joint installation to the cable through setting up cable branch box, so that cable junction produces cable joint, temperature detection module set up in cable joint department, in order to detect cable joint's temperature information is in order to realize the detection to cable joint temperature, works as when monitoring module detects cable joint's temperature and is greater than and predetermines the threshold value, sends the warning suggestion to the staff in time detects and maintains the cable, in order to avoid the sending of fire incident.
In one embodiment, referring to fig. 1, a cable connector temperature monitoring device 10 includes: the temperature detection module 300, the cable distribution box 100 and the monitoring module 400; the cable distribution box 100 is used for integrating and butt-jointing cables 210, and a cable joint 220 is generated at the joint of the cables 210; monitoring module 400 set up in cable junction box 100, temperature detection module 300 with monitoring module 400 is connected, temperature detection module 300 be used for set up in cable joint 220 department, temperature detection module 300 is used for detecting the temperature information of cable joint 220, and will temperature information send to monitoring module 400, monitoring module 400 is used for the basis temperature information, output alarm signal.
Specifically, the cable distribution box, also called as a cable distribution box, is a device for performing tapping, branching, splicing and switching circuits on a cable line, and is used for integrating and butt-jointing cables to connect the cables, a cable joint is generated at a cable joint, and because the cable joint is easily subjected to increase of contact resistance in the operation process due to improper operation process during connection, the temperature of the cable joint is increased, so that the temperature of the cable joint is detected in real time by arranging a temperature detection module and the detection result is sent to a monitoring module, the monitoring module is used for outputting an alarm signal according to the temperature information, namely when the monitoring module detects that the temperature value of the cable joint exceeds a preset threshold value, the alarm signal is output to enable a worker to timely find abnormal information of the cable joint, and the cable joint is maintained or cleared of faults in time, so that fire disasters are avoided.
Foretell cable joint temperature monitoring devices integrates and the butt joint installation to the cable through setting up cable branch box, so that cable junction produces cable joint, temperature detection module set up in cable joint department, in order to detect cable joint's temperature information is in order to realize the detection to cable joint temperature, works as when monitoring module detects cable joint's temperature and is greater than and predetermines the threshold value, sends the warning suggestion to the staff in time detects and maintains the cable, in order to avoid the emergence of fire incident.
In one embodiment, the monitoring module is configured to output the alarm signal when detecting that the temperature information is greater than a preset threshold. Specifically, the temperature information is a temperature value, i.e., the monitoring module is configured to output the alarm signal when detecting that the temperature value is greater than a preset threshold value. It should be understood that, the cable connectors are made of different materials and subjected to different temperatures, and a user may set corresponding preset thresholds according to the material of each cable connector.
In one embodiment, the temperature detection module is a temperature sensor. Specifically, the temperature sensor is a sensor capable of sensing temperature and converting the sensed temperature into a usable output signal, that is, the temperature sensor is capable of detecting the temperature of the cable joint, converting the temperature into a corresponding output signal, and sending the corresponding output signal to the monitoring module. Further, in one embodiment, the temperature sensor is model number DS18B 20. Specifically, the DS18B20 temperature sensor is a single bus type digital temperature sensor, has the advantages of wide temperature measurement range, high sensitivity, simple and convenient use, long service life, good environmental adaptability and the like, is suitable for measuring the external surface temperature of the insulating surface of the cable joint, provides the temperature of a 9-bit (binary) temperature reading indicating device by the DS18B20 temperature sensor, and has the measurement range of-50 to +120 ℃; the measurement error is +/-0.5 ℃, the DS18B20 temperature sensors adopt a single bus technology, each DS18B20 temperature sensor is given with a unique serial number when being delivered from a factory, the used DS18B20 temperature sensors can be connected to one bus in parallel, multi-point temperature measurement is realized through the identification of unique codes of each sensor, and the power supply of the temperature sensors can be provided by the data line without an external power supply.
In one embodiment, referring to fig. 2, the cable termination temperature monitoring device further includes a power supply module 500, the power supply module 500 is connected to the monitoring module 400, and the power supply module 500 is configured to supply power to the monitoring module 400. Specifically, the power supply module is a device capable of providing a power supply to provide an operating voltage for the monitoring module, and it should be understood that the power supply module can be used as a power supply for the cable joint temperature monitoring device to supply power to any device of the cable joint temperature monitoring device that needs to use the power supply. In one embodiment, the power supply module is a battery.
Further, in one embodiment, the power supply module 500 includes an induction coil 510 and a rectifying and filtering unit 520, the induction coil 510 is configured to couple with the cable, the rectifying and filtering unit 520 is respectively connected to the induction coil 510 and the monitoring module 400, the induction coil is configured to obtain electric energy from the cable, and send the electric energy to the monitoring module after being processed by the rectifying and filtering unit, so as to supply power to the monitoring module. It should be understood that the power cable is usually disposed at a high altitude and far from the power supply, if the storage battery is used for supplying power, due to the limitation of the storage battery capacity, the storage battery needs to be replaced frequently or charged, a large amount of labor cost is consumed, if the monitoring module is connected to the alternating current power supply, a long line needs to be connected, the data transmission distance is long, and the power supply cost is high, so that the power supply becomes a key for restricting the development of the monitoring device of the high-voltage transmission line. In this embodiment, the cable passes through electric power output current, produces alternating electromagnetic field, and through setting up induction coil, induction coil obtains the electric energy from the cable through the electromagnetic induction principle, acquires alternating current power supply promptly, the electric energy passes through stable DC power supply after rectifier filter unit handles to last for monitoring module power supply, so that monitoring module normal work. In addition, the working current of a main cable in an urban 10kV cable distribution box is approximately 10-600A, a certain margin is reserved in order to avoid dead angles of power supply, therefore, the starting current of an energy supply power supply is 4A, the 4A current can induce voltage to be 5V, and an electric energy induction coil iron core with power larger than 60mW is made of a microcrystalline alloy material, the sectional area of the iron core is 25mm x 30mm, the iron core adopts two semicircular structures, and the requirement that a shell which is specially designed under a field uninterrupted mode is sleeved on the cable can be met.
In one embodiment, the power supply module further includes a voltage transformation unit, the rectification filtering unit is connected to the monitoring module through the voltage transformation unit, and the voltage transformation unit is configured to transform the rectified and filtered electric energy to output a working voltage of the monitoring module, so as to better supply power to the monitoring module.
In one embodiment, referring to fig. 2, the power supply module 500 further includes a super capacitor 530, and the super capacitor 530 is connected to the rectifying and filtering unit 520. Specifically, a super capacitor is also called an electrochemical capacitor, an electric double layer capacitor, a gold capacitor or a farad capacitor, and is an electrochemical element for storing energy by polarizing an electrolyte. The super capacitor has the characteristics of high charging speed, long service life, simple structure and high safety of a charging and discharging circuit, can be recycled for a long time, is a new concept energy storage device between a traditional storage battery and a traditional electrostatic capacitor, has excellent low-temperature performance, and mostly transfers charges generated in the discharging process on the surface of an electrode active substance, so that the capacity is very small in attenuation along with the temperature, and the capacity attenuation amplitude of the battery can reach 70% at low temperature. It should be understood that the working current of the monitoring module under the standby condition is about 12mA, the working current of the monitoring module can reach about 200mA when the monitoring module normally works, and the super capacitor is used in the power supply module and can supply power to the monitoring module in a high-power moment when the standby state is switched to the working state, so that the monitoring module works more stably and the power supply requirement of the monitoring module is better met. The power supply module can provide instant high-power supply for the monitoring module, namely a GSM unit in the monitoring module when the power supply module normally works, and practical tests show that the voltage of the super capacitor for receiving and transmitting short messages drops by about 0.02V at one time, then the voltage rises again and is recovered to be in a balanced state, and the monitoring module can be in standby state for more than 10min even if the electric energy stored by the super capacitor is used under the condition that the power transmission line has a short-time power failure.
In one embodiment, referring to fig. 3, a cable connector temperature monitoring system 20 includes the cable connector temperature monitoring device described in any of the above embodiments. The device comprises: the temperature detection module 300, the cable distribution box 100 and the monitoring module 400; the cable distribution box 100 is used for integrating and butt-jointing cables 210, and a cable joint 220 is generated at the joint of the cables 210; monitoring module 400 set up in cable junction box 100, temperature detection module 300 with monitoring module 400 is connected, temperature detection module 300 be used for set up in cable joint 220 department, temperature detection module 300 is used for detecting the temperature information of cable joint 220, and will temperature information send to monitoring module 400, monitoring module 400 is used for the basis temperature information, output alarm signal.
The cable joint temperature monitoring system integrates and butt-joints cables through the cable branch box, so that the cable joint is generated at the cable joint, the temperature detection module is arranged at the cable joint to detect the temperature information of the cable joint so as to realize the detection of the temperature of the cable joint, and when the temperature detected by the monitoring module at the cable joint is higher than a preset threshold value, an alarm prompt is sent out, so that a worker can timely detect and maintain the cables to avoid the sending of fire accidents.
In one embodiment, referring to fig. 3, the cable joint temperature monitoring system 20 further includes a service terminal 600; the service terminal 600 is connected to the monitoring module 400, and the monitoring module 400 is configured to send the temperature information to the service terminal 600. Specifically, a service terminal, namely a server, may also be referred to as a remote monitoring center, the monitoring module is configured to send the temperature information to a service terminal, so that a worker may monitor the temperature of the cable connector in the background, and further, in one embodiment, the monitoring module is configured to send an alarm signal to the service terminal when detecting that the temperature information exceeds a preset threshold, so that the background worker may find that the temperature of the cable connector is abnormal in time. Further, in one embodiment, the monitoring module includes a processing unit and a GSM (Global System for Mobile Communication) unit, the GSM unit is connected to the processing unit and the service terminal, respectively, and the processing unit is configured to send the temperature information to the service terminal through the GSM unit. Further, in one embodiment, the service terminal is connected to the monitoring module through an RS232 interface and GSM communication, so as to implement communication connection between the monitoring module and the service terminal. Specifically, the upper computer in the service terminal is connected with the monitoring module through an RS232 interface and GSM communication. By adopting the RS232 interface and GSM communication, the reliability of the communication between the monitoring module and the service terminal is improved, and the influence on network communication is reduced.
In one embodiment, the processing Unit may be a single chip microcomputer, an MCU (micro controller Unit), a central processing Unit, or the like having a data processing device. In one embodiment, the type of the processing unit is a C805IF310 single chip microcomputer, and the C805IF310 single chip microcomputer has the characteristic of low power consumption, so that the power consumption of the processing unit can be reduced, and the power can be saved. In one embodiment, the model of the GSM unit is a Q2406AGSM unit, the Q2406AGSM unit only needs to extend one SIM card, the communication between the UART serial port and the microprocessor is performed, the microprocessor operates the module by applying a GSMAT instruction, when the communication between the monitoring module and the service terminal is needed, the monitoring module, i.e., the microprocessor, sends and receives short messages through the serial port control Q2406A, and the display unit adopts an LED nixie tube to display the temperature of each cable connector in a circular display manner.
In one embodiment, the service terminal is configured to analyze the temperature information according to historical data of the cable joint to obtain an operating state of the cable joint. In one embodiment, the historical data of the cable joint includes historical temperature information of the cable joint and corresponding historical operating states. It should be understood that, because the service terminal is connected with the monitoring module, the monitoring module transmits the temperature information of the cable joint to the service terminal in real time to obtain the historical temperature information of the cable joint, and obtains the running state corresponding to the cable joint when the corresponding temperature is obtained according to the historical temperature information of the cable joint, so that the running state of the cable joint can be judged in real time by acquiring the temperature information of the cable joint in real time, so that a worker can better detect and process the fault of the cable joint.
In one embodiment, the service terminal is provided with a GIS (Geographic Information system) module, the GIS module is configured to obtain map Information including the cable connector, and when the service terminal detects that the cable connector has a fault, the service terminal obtains position Information of the cable connector according to the map Information, so that a worker can find where the cable connector has the fault, and the worker can quickly drive to a fault location to maintain and repair the cable connector.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A cable splice temperature monitoring device, comprising: the temperature detection module, the cable branch box and the monitoring module;
the cable distribution box is used for integrating and butting and installing cables, and a cable joint is generated at the cable connection position;
the monitoring module set up in the cable junction box, temperature detection module with monitoring module connects, temperature detection module be used for set up in cable joint department, temperature detection module is used for detecting cable joint's temperature information, and with temperature information sends to monitoring module, monitoring module is used for the basis temperature information, output alarm signal.
2. The cable joint temperature monitoring device according to claim 1, wherein the monitoring module is configured to output the alarm signal when detecting that the temperature information is greater than a preset threshold.
3. The cable joint temperature monitoring device of claim 1, wherein the temperature detection module is a temperature sensor.
4. The cable joint temperature monitoring device according to any one of claims 1 to 3, further comprising a power supply module, wherein the power supply module is connected with the monitoring module, and the power supply module is used for supplying power to the monitoring module.
5. The cable joint temperature monitoring device according to claim 4, wherein the power supply module comprises an induction coil and a rectifying and filtering unit, the induction coil is used for being coupled with the cable, the rectifying and filtering unit is respectively connected with the induction coil and the monitoring module, the induction coil is used for obtaining electric energy from the cable, and after the electric energy is processed by the rectifying and filtering unit, the electric energy is sent to the monitoring module to supply power to the monitoring module.
6. The cable joint temperature monitoring device of claim 5, wherein the power supply module further comprises a super capacitor, and the super capacitor is connected with the rectifying and filtering unit.
7. A cable splice temperature monitoring system comprising a cable splice temperature monitoring device as claimed in any one of claims 1 to 6.
8. The cable splice temperature monitoring system of claim 7, further comprising a service terminal; the service terminal is connected with the monitoring module, and the monitoring module is used for sending the temperature information to the service terminal.
9. The system according to claim 8, wherein the service terminal is configured to parse the temperature information according to historical data of the cable joint to obtain an operating status of the cable joint.
10. The cable joint temperature monitoring system of claim 9, wherein the cable joint historical data includes historical temperature information and corresponding historical operating conditions of the cable joint.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911087105.4A CN110763348A (en) | 2019-11-08 | 2019-11-08 | Cable joint temperature monitoring device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911087105.4A CN110763348A (en) | 2019-11-08 | 2019-11-08 | Cable joint temperature monitoring device and system |
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| CN110763348A true CN110763348A (en) | 2020-02-07 |
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| CN201911087105.4A Pending CN110763348A (en) | 2019-11-08 | 2019-11-08 | Cable joint temperature monitoring device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769649A (en) * | 2020-07-31 | 2020-10-13 | 国网山东省电力公司寿光市供电公司 | Cable intermediate head monitoring system |
| CN112350264A (en) * | 2020-10-10 | 2021-02-09 | 国网河北省电力有限公司石家庄供电分公司 | Cable accessory temperature detection device and method |
-
2019
- 2019-11-08 CN CN201911087105.4A patent/CN110763348A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769649A (en) * | 2020-07-31 | 2020-10-13 | 国网山东省电力公司寿光市供电公司 | Cable intermediate head monitoring system |
| CN111769649B (en) * | 2020-07-31 | 2023-07-21 | 国网山东省电力公司寿光市供电公司 | Cable intermediate head monitoring system |
| CN112350264A (en) * | 2020-10-10 | 2021-02-09 | 国网河北省电力有限公司石家庄供电分公司 | Cable accessory temperature detection device and method |
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Effective date of registration: 20200927 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant before: GUANGZHOU POWER SUPPLY Co.,Ltd. |