CN105206381A - Intelligent energy-saving distribution capacity-increasing distribution transformer and monitoring method - Google Patents
Intelligent energy-saving distribution capacity-increasing distribution transformer and monitoring method Download PDFInfo
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- CN105206381A CN105206381A CN201510689617.3A CN201510689617A CN105206381A CN 105206381 A CN105206381 A CN 105206381A CN 201510689617 A CN201510689617 A CN 201510689617A CN 105206381 A CN105206381 A CN 105206381A
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Abstract
The invention relates to an intelligent energy-saving distribution capacity-increasing distribution transformer. The intelligent energy-saving distribution capacity-increasing distribution transformer adopts the structure that a high-voltage lead wire built-in voltage and current transformer is mounted on the high-voltage side of a distribution transformer body; a low-voltage lead wire built-in voltage and current transformer is mounted on the low-voltage side of the distribution transformer body; a sunshine recorder is mounted at the top of the housing of the distribution transformer body; a transformer oil level and oil temperature sensor is mounted on the inner side wall of a transformer oil tank at the top of the distribution transformer body; an intelligent monitoring terminal is mounted on the side wall of the housing of the distribution transformer body; the signal output terminals of the high-voltage lead wire built-in voltage and current transformer, the low-voltage lead wire built-in voltage and current transformer, the sunshine recorder, and the transformer oil level and oil temperature sensor are all connected with the intelligent monitoring terminal. The intelligent energy-saving distribution capacity-increasing distribution transformer has the advantages that real-time running state monitoring and environmental condition monitoring can be realized; the running state of the transformer can be judged.
Description
Technical field
The present invention relates to power transmission and distribution technical field, be specifically related to a kind of intelligent power saving increase-volume distribution transformer and method for supervising.
Background technology
Distribution transformer is the key equipment in electric power system.In major part community of current China, controller switching equipment intelligence degree is lower, monitoring running state equipment is few, information transmission channel lacks, still adopt traditional equipment periodic inspection mode at present, although contribute to fault diagnosis in early stage, but this mode is only the safe operation that ensure that equipment, do not possess good economy, and along with the development of China's power grid construction, the lifting that the rising of power consumption and user require the quality of power supply, the trend that the workload of maintainer becomes to increase gradually, above-mentioned traditional periodic inspection mode, at substantial manpower and materials, reduce operating efficiency.
Summary of the invention
The object of the present invention is to provide a kind of intelligent power saving increase-volume distribution transformer and method for supervising, this transformer can realize real-time monitoring running state and environmental condition monitoring, and judges the running status of transformer.
For solving the problems of the technologies described above, a kind of intelligent power saving increase-volume distribution transformer disclosed by the invention, it comprises distribution transformer body, it is characterized in that: it also comprises high-voltage leading-out wire built-in voltage and current transformer, low pressure lead-out wire built-in voltage and current transformer, sunshine recorder, transformer oil level and oil temperature sensor and intelligent monitoring terminal, wherein, described high-voltage leading-out wire built-in voltage and current transformer are arranged on the high-pressure side of distribution transformer body, for monitoring the on high-tension side real-time voltage value of distribution transformer body and current value;
Described low pressure lead-out wire built-in voltage and current transformer are arranged on the low-pressure side of distribution transformer body, and low pressure lead-out wire built-in voltage and current transformer are for monitoring real-time voltage value and the current value of distribution transformer body low-pressure side;
Described sunshine recorder is arranged on the top of distribution transformer body housing, and sunshine recorder is for monitoring the heat at real-time sunshine of distribution transformer body;
Described transformer oil level and oil temperature sensor are arranged on the madial wall of the oil tank of transformer being positioned at distribution transformer bodies top, and transformer oil level and oil temperature sensor are for monitoring oil temperature in oil tank of transformer and oil level;
Described intelligent monitoring terminal is arranged on the sidewall of distribution transformer body housing, and the signal output part of described high-voltage leading-out wire built-in voltage and current transformer, low pressure lead-out wire built-in voltage and current transformer, sunshine recorder and transformer oil level and oil temperature sensor is all connected the signal input part of intelligent monitoring terminal.
A method for supervising for above-mentioned intelligent power saving increase-volume distribution transformer, it comprises the steps:
Step 1: described transformer oil level and oil temperature sensor measure the real-time transformer oil temperature t of distribution transformer body
become, environment temperature sensor measures ambient temperature t real-time around distribution transformer body
ringsurrounding air density sensor measures surrounding air density p real-time around distribution transformer body, pressurization by compressed air specific heat c real-time around distribution transformer body measured by surrounding air specific heat at constant pressure measuring instrument, ambient wind velocity Q real-time around ambient wind velocity sensor measurement distribution transformer body, sunshine recorder measures the heat Φ at real-time sunshine of distribution transformer body
day, meanwhile, transformer oil level and oil temperature sensor, environment temperature sensor, surrounding air density sensor, surrounding air specific heat at constant pressure measuring instrument, ambient wind velocity transducer and sunshine recorder are respectively by transformer oil temperature t
become, ambient temperature t
ring, surrounding air density p, pressurization by compressed air specific heat c, ambient wind velocity Q and sunshine heat Φ
daybe transferred to intelligent monitoring terminal;
Step 2: intelligent monitoring terminal is according to transformer oil temperature t obtained above
become, ambient temperature t
ring, surrounding air density p, pressurization by compressed air specific heat c and ambient wind velocity Q, utilize formula Φ
loose=ρ cQ (t
become-t
ring) calculate the heat that distribution transformer body gives out because of air speed influence;
Step 3: the transformer oil temperature t obtained when intelligent monitoring terminal
becomeduring > 85 DEG C, represent the improper load operation of distribution transformer body;
As the transformer oil temperature t that intelligent monitoring terminal obtains
becomeduring < 70 DEG C, represent that distribution transformer body normal duty runs;
As the transformer oil temperature 70 DEG C≤t that intelligent monitoring terminal obtains
becomewhen≤85 DEG C, calculate Φ further
daythe heat Φ given out because of air speed influence with distribution transformer body
loosebetween difference, work as Φ
day-Φ
looseillustrate when>=0 that solar radiation distribution transformer body normally runs;
Work as Φ
day-Φ
looseillustrate during < 0 that the heat at sunshine can be blazed abroad by air flowing, distribution transformer body normally runs.
Beneficial effect of the present invention:
The present invention can realize real-time monitoring running state and environmental condition monitoring, and the running status of transformer is judged, the mode of relatively traditional manual inspection, the present invention greatly improves the monitoring efficiency of running state of transformer, and the result of running state of transformer monitoring is more accurate, facilitate operation maintenance personnel to the on-call maintenance of failure transformer, be conducive to the useful life of improving transformer.After using the present invention, operation maintenance personnel on the basis ensureing distribution transformer safety, can increase distribution transformer maximum delivery power, reaches the object of dynamic compatibilization.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is the structured flowchart of circuit part of the present invention
Wherein, 1-high-voltage leading-out wire built-in voltage and current transformer, 2-low pressure lead-out wire built-in voltage and current transformer, 3-GPS positioning equipment, 4-sunshine recorder, 5-transformer oil level and oil temperature sensor, 6-intelligent monitoring terminal, 7-distribution transformer body, 8-oil tank of transformer, 9-environment temperature sensor, 10-ambient pressure transducer, 11-ambient wind velocity transducer, 12-surrounding air density sensor, 13-surrounding air specific heat at constant pressure measuring instrument, 14-remote subscriber control system.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
A kind of intelligent power saving increase-volume distribution transformer of the present invention, it comprises distribution transformer body 7, high-voltage leading-out wire built-in voltage and current transformer 1, low pressure lead-out wire built-in voltage and current transformer 2, sunshine recorder 4, transformer oil level and oil temperature sensor 5 and intelligent monitoring terminal 6, wherein, described high-voltage leading-out wire built-in voltage and current transformer 1 are arranged on the high-pressure side of distribution transformer body 7, for monitoring the on high-tension side real-time voltage value of distribution transformer body 7 and current value;
Described low pressure lead-out wire built-in voltage and current transformer 2 are arranged on the low-pressure side of distribution transformer body 7, and low pressure lead-out wire built-in voltage and current transformer 2 are for monitoring real-time voltage value and the current value of distribution transformer body 7 low-pressure side;
Described sunshine recorder 4 is arranged on the top of distribution transformer body 7 housing, and sunshine recorder 4 is for monitoring the heat at real-time sunshine of distribution transformer body 7;
Described transformer oil level and oil temperature sensor 5 are arranged on the madial wall of the oil tank of transformer 8 being positioned at distribution transformer body 7 top, and transformer oil level and oil temperature sensor 5 are for monitoring oil temperature in oil tank of transformer 8 and oil level;
Described intelligent monitoring terminal 6 is arranged on the sidewall of distribution transformer body 7 housing, and the signal output part of described high-voltage leading-out wire built-in voltage and current transformer 1, low pressure lead-out wire built-in voltage and current transformer 2, sunshine recorder 4 and transformer oil level and oil temperature sensor 5 is all connected the signal input part of intelligent monitoring terminal 6.
In technique scheme, it also comprises GPS (GlobalPositioningSystem, global positioning system) positioning equipment 3, described GPS positioning equipment 3 is arranged on the top of distribution transformer body 7 housing, and the communication ends of described GPS positioning equipment 3 connects the GPS locator data communication ends of intelligent monitoring terminal 6.GPS positioning equipment 3 can be monitored distribution transformer present position, and when distribution transformer present position changes, this system can carry out reporting to the police and locating distribution transformer present position.
In technique scheme, it also comprises peripheral meteorological data transducer, and the signal output part of described peripheral meteorological data transducer connects the environment weather data communication end of intelligent monitoring terminal 6.
In technique scheme, described peripheral meteorological data transducer comprises environment temperature sensor 9, ambient pressure transducer 10 and ambient wind velocity transducer 11, and described environment temperature sensor 9, ambient pressure transducer 10 and the signal output part of ambient wind velocity transducer 11 are all connected the environment weather data communication end of intelligent monitoring terminal 6.
In technique scheme, it also comprises surrounding air density sensor 12 and surrounding air specific heat at constant pressure measuring instrument 13, and described surrounding air density sensor 12 and the signal output part of surrounding air specific heat at constant pressure measuring instrument 13 are all connected the environment weather data communication end of intelligent monitoring terminal 6.
In technique scheme, it also comprises remote subscriber control system 14, and the communication ends of described remote subscriber control system 14 is connected with intelligent monitoring terminal 6 data communication end radio communication.
Above-mentioned environment temperature sensor 9, ambient pressure transducer 10, ambient wind velocity transducer 11, surrounding air density sensor 12 and surrounding air specific heat at constant pressure measuring instrument 13 are all arranged in the environmental data collecting point around distribution transformer body 7.Described remote subscriber control system 14 is arranged in the operation maintenance personnel office of far-end.
In technique scheme, distribution transformer body 7 selects three dimensional wound core energy-efficient distribution transformer, selects the reason of three dimensional wound core transformer to be that three dimensional wound core transformer has no-load loss low, stable magnetic field, the advantages such as leakage field is few.Meet the requirement of society to energy-saving and emission-reduction now.
The present invention is by measuring the external parameters such as the voltage of distribution transformer, electric current, the isallobaric device inherent parameters of oil temperature and ambient temperature, wind speed, intensity of sunshine, synthetic determination distribution transformer working capacity.Thus operation maintenance personnel can be facilitated to improve distribution transformer maximum delivery power in scheduling aspect.
A method for supervising for above-mentioned intelligent power saving increase-volume distribution transformer, it is characterized in that, it comprises the steps:
Step 1: described transformer oil level and oil temperature sensor 5 measure the real-time transformer oil temperature t of distribution transformer body 7
become, environment temperature sensor 9 measures ambient temperature t real-time around distribution transformer body 7
ringsurrounding air density sensor 12 measures surrounding air density p real-time around distribution transformer body 7, pressurization by compressed air specific heat c real-time around distribution transformer body 7 measured by surrounding air specific heat at constant pressure measuring instrument 13, ambient wind velocity Q real-time around distribution transformer body 7 measured by ambient wind velocity transducer 11, and sunshine recorder 4 measures the heat Φ at real-time sunshine of distribution transformer body 7
day, meanwhile, transformer oil level and oil temperature sensor 5, environment temperature sensor 9, surrounding air density sensor 12, surrounding air specific heat at constant pressure measuring instrument 13, ambient wind velocity transducer 11 and sunshine recorder 4 are respectively by transformer oil temperature t
become, ambient temperature t
ring, surrounding air density p, pressurization by compressed air specific heat c, ambient wind velocity Q and sunshine heat Φ
daybe transferred to intelligent monitoring terminal 6;
Step 2: intelligent monitoring terminal 6 is according to transformer oil temperature t obtained above
become, ambient temperature t
ring, surrounding air density p, pressurization by compressed air specific heat c and ambient wind velocity Q, utilize formula Φ
loose=ρ cQ (t
become-t
ring) calculate the heat that distribution transformer body 7 gives out because of air speed influence;
Step 3: the transformer oil temperature t obtained when intelligent monitoring terminal 6
becomeduring > 85 DEG C, represent the improper load operation of distribution transformer body 7;
As the transformer oil temperature t that intelligent monitoring terminal 6 obtains
becomeduring < 70 DEG C, represent that distribution transformer body 7 normal duty runs;
As the transformer oil temperature 70 DEG C≤t that intelligent monitoring terminal 6 obtains
becomewhen≤85 DEG C, calculate Φ further
daythe heat Φ given out because of air speed influence with distribution transformer body 7
loosebetween difference, work as Φ
day-Φ
looseillustrate when>=0 that solar radiation distribution transformer body 7 normally runs, now advise that operation maintenance personnel is closely observed transformer, and reduce load operation when conditions permit; Work as Φ
day-Φ
looseillustrate during < 0 that the heat at sunshine can be blazed abroad by air flowing, distribution transformer body 7 normally runs.
In the step 1 of technique scheme, high-voltage leading-out wire built-in voltage and current transformer 1 monitor the on high-tension side real-time voltage value of distribution transformer body 7 and current value; Low pressure lead-out wire built-in voltage and current transformer 2 monitor real-time voltage value and the current value of distribution transformer body 7 low-pressure side; The real-time voltage value of on high-tension side for distribution transformer body 7 real-time voltage value and current value and distribution transformer body 7 low-pressure side and current value are transferred to intelligent monitoring terminal 6 by high-voltage leading-out wire built-in voltage and current transformer 1 and low pressure lead-out wire built-in voltage and current transformer 2 respectively;
In described step 3, when in the critical field having a value no longer to preset in the real-time voltage value and current value of the on high-tension side real-time voltage value of distribution transformer body 7 and current value and low-pressure side, then distribution transformer body 7 operation exception is described.
By above method, on the basis ensureing distribution transformer safety, distribution transformer maximum delivery power can be increased, reaches the object of dynamic compatibilization.
Also step 4 is comprised: distribution transformer body 7 is run whether normal result is uploaded to remote subscriber control system 14 by described intelligent monitoring terminal 6 after the step 3 of technique scheme.
The unified unit used of ambient temperature data unit measured by the present invention is degree Celsius (DEG C), and the unified unit used of measured air speed data unit is cubic meter (m per hour
3/ h), the unified unit used of measured insolation data unit is kilojoule (kJ), and the unified unit used of the inner oil temperature data unit of measured distribution transformer is degree Celsius (DEG C).
The content that this specification is not described in detail belongs to the known prior art of this area specialty operation maintenance personnel.
Claims (9)
1. an intelligent power saving increase-volume distribution transformer, it comprises distribution transformer body (7), it is characterized in that: it also comprises high-voltage leading-out wire built-in voltage and current transformer (1), low pressure lead-out wire built-in voltage and current transformer (2), sunshine recorder (4), transformer oil level and oil temperature sensor (5) and intelligent monitoring terminal (6), wherein, described high-voltage leading-out wire built-in voltage and current transformer (1) are arranged on the high-pressure side of distribution transformer body (7), for monitoring the on high-tension side real-time voltage value of distribution transformer body (7) and current value,
Described low pressure lead-out wire built-in voltage and current transformer (2) are arranged on the low-pressure side of distribution transformer body (7), and low pressure lead-out wire built-in voltage and current transformer (2) are for monitoring real-time voltage value and the current value of distribution transformer body (7) low-pressure side;
Described sunshine recorder (4) is arranged on the top of distribution transformer body (7) housing, and sunshine recorder (4) is for monitoring the heat at real-time sunshine of distribution transformer body (7);
Described transformer oil level and oil temperature sensor (5) are arranged on the madial wall of the oil tank of transformer (8) being positioned at distribution transformer body (7) top, and transformer oil level and oil temperature sensor (5) are for monitoring oil temperature in oil tank of transformer (8) and oil level;
Described intelligent monitoring terminal (6) is arranged on the sidewall of distribution transformer body (7) housing, and the signal output part of described high-voltage leading-out wire built-in voltage and current transformer (1), low pressure lead-out wire built-in voltage and current transformer (2), sunshine recorder (4) and transformer oil level and oil temperature sensor (5) is all connected the signal input part of intelligent monitoring terminal (6).
2. intelligent power saving increase-volume distribution transformer according to claim 1, it is characterized in that: it also comprises GPS positioning equipment (3), described GPS positioning equipment (3) is arranged on the top of distribution transformer body (7) housing, and the communication ends of described GPS positioning equipment (3) connects the GPS locator data communication ends of intelligent monitoring terminal (6).
3. intelligent power saving increase-volume distribution transformer according to claim 1, it is characterized in that: it also comprises peripheral meteorological data transducer, the signal output part of described peripheral meteorological data transducer connects the environment weather data communication end of intelligent monitoring terminal (6).
4. intelligent power saving increase-volume distribution transformer according to claim 3, it is characterized in that: described peripheral meteorological data transducer comprises environment temperature sensor (9), ambient pressure transducer (10) and ambient wind velocity transducer (11), described environment temperature sensor (9), ambient pressure transducer (10) and the signal output part of ambient wind velocity transducer (11) are all connected the environment weather data communication end of intelligent monitoring terminal (6).
5. intelligent power saving increase-volume distribution transformer according to claim 1, it is characterized in that: it also comprises surrounding air density sensor (12) and surrounding air specific heat at constant pressure measuring instrument (13), described surrounding air density sensor (12) and the signal output part of surrounding air specific heat at constant pressure measuring instrument (13) are all connected the environment weather data communication end of intelligent monitoring terminal (6).
6. intelligent power saving increase-volume distribution transformer according to claim 1, it is characterized in that: it also comprises remote subscriber control system (14), the communication ends of described remote subscriber control system (14) is connected with intelligent monitoring terminal (6) data communication end radio communication.
7. a method for supervising for intelligent power saving increase-volume distribution transformer described in claim 1, it is characterized in that, it comprises the steps:
Step 1: described transformer oil level and oil temperature sensor (5) measure the real-time transformer oil temperature t of distribution transformer body (7)
become, environment temperature sensor (9) measures the real-time ambient temperature t of distribution transformer body (7) around
ringsurrounding air density sensor (12) measures the real-time surrounding air density p of distribution transformer body (7) around, the real-time pressurization by compressed air specific heat c of distribution transformer body (7) measured around by surrounding air specific heat at constant pressure measuring instrument (13), distribution transformer body (7) ambient wind velocity Q real-time around measured by ambient wind velocity transducer (11), and sunshine recorder (4) measures the heat Φ at real-time sunshine of distribution transformer body (7)
daymeanwhile, transformer oil level and oil temperature sensor (5), environment temperature sensor (9), surrounding air density sensor (12), surrounding air specific heat at constant pressure measuring instrument (13), ambient wind velocity transducer (11) and sunshine recorder (4) are respectively by transformer oil temperature t
become, ambient temperature t
ring, surrounding air density p, pressurization by compressed air specific heat c, ambient wind velocity Q and sunshine heat Φ
daybe transferred to intelligent monitoring terminal (6);
Step 2: intelligent monitoring terminal (6) is according to transformer oil temperature t obtained above
become, ambient temperature t
ring, surrounding air density p, pressurization by compressed air specific heat c and ambient wind velocity Q, utilize formula Φ
loose=ρ cQ (t
become-t
ring) calculate distribution transformer body (7) heat that gives out because of air speed influence;
Step 3: the transformer oil temperature t obtained when intelligent monitoring terminal (6)
becomeduring > 85 DEG C, represent distribution transformer body (7) improper load operation;
As the transformer oil temperature t that intelligent monitoring terminal (6) obtains
becomeduring < 70 DEG C, represent that distribution transformer body (7) normal duty runs;
As the transformer oil temperature 70 DEG C≤t that intelligent monitoring terminal (6) obtains
becomewhen≤85 DEG C, calculate Φ further
daythe heat Φ given out because of air speed influence with distribution transformer body (7)
loosebetween difference, work as Φ
day-Φ
looseillustrate when>=0 that solar radiation distribution transformer body (7) normally runs; Work as Φ
day-Φ
looseillustrate during < 0 that the heat at sunshine can be blazed abroad by air flowing, distribution transformer body (7) normally runs.
8. method for supervising according to claim 7, is characterized in that: in described step 1, and high-voltage leading-out wire built-in voltage and current transformer (1) monitor distribution transformer body (7) on high-tension side real-time voltage value and current value; The real-time voltage value of low pressure lead-out wire built-in voltage and current transformer (2) monitoring distribution transformer body (7) low-pressure side and current value; The real-time voltage value of on high-tension side for distribution transformer body (7) real-time voltage value and current value and distribution transformer body (7) low-pressure side and current value are transferred to intelligent monitoring terminal (6) by high-voltage leading-out wire built-in voltage and current transformer (1) and low pressure lead-out wire built-in voltage and current transformer (2) respectively;
In described step 3, when in the critical field having a value no longer to preset in the real-time voltage value and current value of the on high-tension side real-time voltage value of distribution transformer body (7) and current value and low-pressure side, then distribution transformer body (7) operation exception is described.
9. method for supervising according to claim 8, is characterized in that: also comprise step 4 after described step 3: distribution transformer body (7) is run whether normal result is uploaded to remote subscriber control system (14) by described intelligent monitoring terminal (6).
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| CN201510689617.3A CN105206381B (en) | 2015-10-21 | 2015-10-21 | Intelligent power saving increase-volume distribution transformer and monitoring method |
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|---|---|---|---|
| CN201510689617.3A CN105206381B (en) | 2015-10-21 | 2015-10-21 | Intelligent power saving increase-volume distribution transformer and monitoring method |
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Cited By (6)
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| CN105676030A (en) * | 2016-01-29 | 2016-06-15 | 杭州海兴电力科技股份有限公司 | Transformer monitoring terminal |
| CN107238783A (en) * | 2017-06-02 | 2017-10-10 | 合肥同佑电子科技有限公司 | A kind of transformer monitoring systems and monitoring method |
| CN109559880A (en) * | 2018-11-06 | 2019-04-02 | 国网山东省电力公司龙口市供电公司 | A kind of Intelligent distribution transformer |
| CN109964289A (en) * | 2016-09-12 | 2019-07-02 | Abb瑞士股份有限公司 | Lid for the distribution transformer filled with dielectric fluid |
| CN110739140A (en) * | 2019-10-28 | 2020-01-31 | 江苏龙创电气有限公司 | distribution transformer with automatic capacity regulating function |
| CN111263969A (en) * | 2017-03-10 | 2020-06-09 | Abb 瑞士股份有限公司 | Intelligent power grid distribution transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105676030A (en) * | 2016-01-29 | 2016-06-15 | 杭州海兴电力科技股份有限公司 | Transformer monitoring terminal |
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| CN110739140A (en) * | 2019-10-28 | 2020-01-31 | 江苏龙创电气有限公司 | distribution transformer with automatic capacity regulating function |
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| CN105206381B (en) | 2017-08-29 |
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Effective date of registration: 20170217 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Applicant after: Nanjing Nari Co., Ltd. Applicant after: State Grid Beijing Electric Power Company Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee after: NARI Group Corp. Patentee after: STATE GRID BEIJING ELECTRIC POWER Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee before: Nanjing Nanrui Group Co. Patentee before: STATE GRID BEIJING ELECTRIC POWER Co. |
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