CN203203611U - Quasi-distributed high voltage transmission line optical fiber monitoring network - Google Patents
Quasi-distributed high voltage transmission line optical fiber monitoring network Download PDFInfo
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- CN203203611U CN203203611U CN2013201979161U CN201320197916U CN203203611U CN 203203611 U CN203203611 U CN 203203611U CN 2013201979161 U CN2013201979161 U CN 2013201979161U CN 201320197916 U CN201320197916 U CN 201320197916U CN 203203611 U CN203203611 U CN 203203611U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The utility model discloses a quasi-distributed high voltage transmission line optical fiber monitoring network, comprising a transformer station control unit, a first wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexer, and two base tower monitoring subsystems; wherein the transformer station control unit comprises a communication control module, an optical signal demodulation module, and a fourth wavelength division multiplexer; the each base tower monitoring subsystem comprises a first optical path selection switch, a second optical path selection switch, a third optical path selection switch, a photoelectric conversion module, a controller, a first electro-optical conversion module, a second electro-optical conversion module, and a tower state sensor group. The quasi-distributed high voltage transmission line optical fiber monitoring network of the utility model raises the detection precision for lead aeolian vibration, lead temperature, and tower oblique angle of the high voltage transmission line, and raises the detection efficiency for the above parameters.
Description
Technical field
The utility model relates to the optical fiber transmission technique field, is specifically related to a kind of quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network.
Technical background
The main object of ultra-high-tension power transmission line running state monitoring comprises wire thermometric, wire aeolian vibration, insulator state, shaft tower angle of inclination etc., can prevent some transmission line of electricity to be produced the factor of disaster by the monitoring to this tittle.Existing condition monitoring system is measured tilting gearing, wire aeolian vibration device etc. usually only for one or more monitoring variables such as shaft tower, adopts electric signal sensor, by wireless network data remote to reception server is processed.But there is the problem that is subject to the strong-electromagnetic field interference and affects measuring accuracy and insulating property in the induction of electric signal sensor inevitably with transmission.For the sensor of high-pressure side, system is all hung over high-pressure side especially, just in case break down, basically can not carry out maintenance operation.
In the practical application, fiber-optic grating sensor is used in the measurement of the pinpoint monitoring of needs such as wire aeolian vibration, wire thermometric, shaft tower inclination etc. usually.Each grating takies certain frequency band in the scope of measuring, normally used light source bandwidth only has 40nm, and the grating quantity of so altogether using just is restricted, and the number of sensors of namely using when monitoring wire and shaft tower state is restricted.In order to set up the monitoring of many basic weight point shaft towers and circuit, required number of sensors surpasses the grating quantity that the light source scope can allow, and will consider to adopt the mode of photoswitch switching, and minute multichannel goes the rounds to detect raster values.Because above-mentioned restriction, existing optical sensor system all are take a basic shaft tower as the basis usually, carry out the monitoring of a certain individual event or several sensing amounts, the information exchange that obtains is crossed wireless mode and is sent on the server.An above-mentioned basic shaft tower obviously can bring testing cost high for the detection mode on basis, the problem that detection efficiency is low.High-tension electricity can disturb the signal parameter of wireless transmission simultaneously, has reduced whole accuracy of detection.
The utility model content
The purpose of this utility model is for above-mentioned technical matters, a kind of quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network is provided, this Sampling network can improve the accuracy of detection at the aeolian vibration of high-voltage power line conductive line, conductor temperature, shaft tower angle of inclination, improves the efficient that above-mentioned parameter detects.
For realizing this purpose, the quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network that the utility model is designed, it is characterized in that: it comprises the Substation control unit, the first wavelength division multiplexer, the second wavelength division multiplexer, the 3rd wavelength division multiplexer and two basic shaft tower monitoring subsystems, wherein, described Substation control unit comprises communication control module, light signal demodulation module and the 4th wavelength division multiplexer, described each basic shaft tower monitoring subsystem comprises the first light path selector switch, the second light path selector switch, the 3rd light path selector switch, photoelectric conversion module, controller, the first electrooptic conversion module, the second electrooptic conversion module and shaft tower state sensor group, wherein, the first light path selector switch connects controller by photoelectric conversion module, controller connects the second light path selector switch by the first electrooptic conversion module, controller connects the 3rd light path selector switch by the second electrooptic conversion module, the first light path selector switch also directly is connected with the second light path selector switch, and the signal output part of shaft tower state sensor group connects the 3rd light path selector switch; Described communication control module is connected the 4th wavelength division multiplexer with the light signal demodulation module and connects the first wavelength division multiplexer, described the first wavelength division multiplexer connects respectively the first light path selector switch and the 3rd light path selector switch of first basic shaft tower monitoring subsystem, the second light path selector switch of described first basic shaft tower monitoring subsystem connects the 3rd wavelength division multiplexer with the 3rd light path selector switch by the second wavelength division multiplexer, and described the 3rd wavelength division multiplexer connects respectively the first light path selector switch and the 3rd light path selector switch of second basic shaft tower monitoring subsystem.
Described communication control module comprises substation controller and the 3rd electrooptic conversion module, described light signal demodulation module comprises wideband light source, optical modulator instrument and circulator, wherein, described substation controller accesses the 4th wavelength division multiplexer by the 3rd electrooptic conversion module, and wideband light source and optical modulator instrument all access the 4th wavelength division multiplexer by circulator.
Described shaft tower state sensor group comprises optical fiber composite insulator mechanical property survey sensor, slant optical fiber angular transducer, shaft tower strain optical fiber measurement sensor, conductor vibration optical fiber measurement sensor, wire optical-fiber temperature measuring sensor and electric armour clamp optical-fiber temperature measuring sensor.
Described the 4th wavelength division multiplexer is by OPGW(Optical Fiber Composite Overhead Ground Wire, Optical Fiber composite overhead Ground Wire) optical cable connects the first wavelength division multiplexer; Described the second wavelength division multiplexer connects the 3rd wavelength division multiplexer by the OPGW optical cable.
Described optical fiber composite insulator mechanical property survey sensor is arranged in the shaft tower insulator, described slant optical fiber angular transducer has two, a slant optical fiber angular transducer is arranged on the shaft tower tower head, and another slant optical fiber angular transducer is arranged on the shaft tower middle part.
The beneficial effects of the utility model are:
1) all monitoring equipments mostly are passive in the utility model, have solved insoluble power issue in the traditional circuit monitoring technology; Fibre Optical Sensor is complete passive sensing mode take light as medium, can not be subject to the impact of electromagnetic environment; The dielectric level that the traditional electrical sensor can not affect circuit is compared in optical fiber insulation itself.Therefore use Fibre Optical Sensor can greatly improve stability and the circuit reliability of operation of monitoring system.
2) important performance characteristic of the ultra-high-tension power transmission lines such as conductor temperature, wire aeolian vibration, shaft tower angle of inclination, shaft tower stress distribution, composite insulator mechanical property is all passed through corresponding Fibre Optical Sensor collection, and by the present line monitoring of network implementation of the present utility model, realized simultaneously simultaneously the be correlated with detection of operational factor of a plurality of basic shaft towers, compare existing take a basic shaft tower as the basis detection mode, detection efficiency obviously improves.
3) the utility model carries out optical signal transmission by the OPGW optical cable, be convenient to signal distributed collection, focus on, reduce simultaneously difficulty of construction, improve the extent for multiplexing of network.
4) hardware devices such as light source, modulation /demodulation multiplexing in the utility model is conducive to make up distributed full light sensing transmission line of electricity monitoring network, effectively reduces the project construction cost, avoids overlapping investment.
Description of drawings
Fig. 1 is structured flowchart of the present utility model.
Wherein, the 1-the first wavelength division multiplexer, the 2-the second wavelength division multiplexer, 3-communication control module, 4-light signal demodulation module, the 5-the three wavelength division multiplexer, the 6-the first light path selector switch, the 7-the second light path selector switch, the 8-the three light path selector switch, 9-photoelectric conversion module, 10-controller, the 11-the first electrooptic conversion module, the 12-the four wavelength division multiplexer, 13-substation controller, 14-wideband light source, 15-optical modulator instrument, 16-circulator, 17-optical fiber composite insulator mechanical property survey sensor, 18-slant optical fiber angular transducer, 19-shaft tower strain optical fiber measurement sensor, 20-conductor vibration optical fiber measurement sensor, 21-wire optical-fiber temperature measuring sensor, 22-electric armour clamp optical-fiber temperature measuring sensor, the 23-the second electrooptic conversion module, the 24-the three electrooptic conversion module.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
Quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network as shown in Figure 1, comprise the Substation control unit, the first wavelength division multiplexer 1, the second wavelength division multiplexer 2, the 3rd wavelength division multiplexer 5 and two basic shaft tower monitoring subsystems, wherein, described Substation control unit comprises communication control module 3, light signal demodulation module 4 and the 4th wavelength division multiplexer 12, described each basic shaft tower monitoring subsystem comprises the first light path selector switch 6, the second light path selector switch 7, the 3rd light path selector switch 8, photoelectric conversion module 9, controller 10, the first electrooptic conversion module 11, the second electrooptic conversion module 23 and shaft tower state sensor group, wherein, the first light path selector switch 6 connects controller 10 by photoelectric conversion module 9, controller 10 connects the second light path selector switch 7 by the first electrooptic conversion module 11, controller 10 connects the 3rd light path selector switch 8 by the second electrooptic conversion module 23, the first light path selector switch 6 also directly is connected with the second light path selector switch 7, and the signal output part of shaft tower state sensor group connects the 3rd light path selector switch 8; Communication control module 3 is connected with the light signal demodulation module by the 4th wavelength division multiplexer 12 connections the first wavelength division multiplexer 1, the first wavelength division multiplexer 1 connects respectively the first light path selector switch 6 and the 3rd light path selector switch 8 of first basic shaft tower monitoring subsystem, the second light path selector switch 7 of first basic shaft tower monitoring subsystem connects the first light path selector switch 6 and the 3rd light path selector switch 8 that the 3rd wavelength division multiplexer 5, the three wavelength division multiplexers 5 connect respectively second basic shaft tower monitoring subsystem with the 3rd light path selector switch 8 by the second wavelength division multiplexer 2.
What describe in the technique scheme is a base unit of quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network, can connect a plurality of basic shaft tower monitoring subsystems in the implementation, the access number of base shaft tower monitoring subsystem is determined according to following method: the insertion loss of wavelength division multiplexer is 0.5dB approximately, the insertion loss of light path selector switch is 0.3dB approximately, consider light reflection back and forth, the optical attenuation of a basic shaft tower system is 1.6dB approximately, suppose approximately 500 meters of fiber lengths between two basic shaft towers, optical transmission loss is 0.25dB/km approximately, consider back and forth, loss is 0.25dB approximately, such COMPREHENSIVE CALCULATING, and the light loss of a basic shaft tower is 1.9dB approximately.With 200mW, the light source of 24dBm is example, and the resolution power of optical modulator instrument is about 0.5dBm, and the shaft tower quantity that can carry out cascade is 12 bases approximately.If strengthen the luminous power of transformer station's main frame, can carry out more shaft tower cascade.
In the technique scheme, communication control module 3 comprises substation controller 13 and the 3rd electrooptic conversion module 24, light signal demodulation module 4 comprises wideband light source 14, optical modulator instrument 15 and circulator 16, wherein, substation controller 13 is by the 3rd electrooptic conversion module 24 accesses the 4th wavelength division multiplexer 12, and wideband light source 14 and optical modulator instrument 15 are all by circulator 16 accesses the 4th wavelength division multiplexer 12.Substation controller 13 is the control signal transmitting-receiving, and wideband light source 14 is light emitting devices, is used for the emission light wave, wavelength is 1550nm, optical modulator instrument 15 is the light path demodulated equipment, is used for receiving the information of optical wavelength, and wavelength information is converted into the information of temperature or strain.Circulator 16 is the non-heterogeneite device of multiport input and output, so that light signal can only be along the port sequential delivery of regulation.
In the technique scheme, shaft tower state sensor group comprises optical fiber composite insulator mechanical property survey sensor 17, slant optical fiber angular transducer 18, shaft tower strain optical fiber measurement sensor 19, conductor vibration optical fiber measurement sensor 20, wire optical-fiber temperature measuring sensor 21 and electric armour clamp optical-fiber temperature measuring sensor 22.
In the technique scheme, the 4th wavelength division multiplexer 12 connects the first wavelength division multiplexer 1 by the OPGW optical cable; The second wavelength division multiplexer 2 connects the 3rd wavelength division multiplexer 5 by the OPGW optical cable.
In the technique scheme, optical fiber composite insulator mechanical property survey sensor 17 is arranged in the shaft tower insulator, slant optical fiber angular transducer 18 has two, and a slant optical fiber angular transducer 18 is arranged on the shaft tower tower head, and another slant optical fiber angular transducer 18 is arranged on the shaft tower middle part.
In the technique scheme, slant optical fiber angular transducer 18 can be monitored shaft tower, and resolution is 0.05 degree, and measurement range is-10 ~ 10 degree, and the adaptive temperature scope is-20 ℃～120 ℃.
Wire optical-fiber temperature measuring sensor 21 and electric armour clamp optical-fiber temperature measuring sensor 22 are respectively applied to measure the temperature of basic shaft tower upper conductor and gold utensil, and the temperature-measuring range of above-mentioned two sensors is-20 ℃～120 ℃, and measuring accuracy is-0.5 ~ 0.5 ℃.
Conductor vibration optical fiber measurement sensor 20 is installed on the transmission line of electricity, and the measurement amplitude of this sensor is 1500 μ ε, and survey frequency is less than or equal to 200HZ.This sensor is used for measuring because little wind-induced conductor vibration.
Shaft tower strain optical fiber measurement sensor 19 is installed four at body of the tower, and the measurement range of each sensor is-1500 ~ 1500 μ ε, and resolution is 1 μ ε, and the adaptive temperature scope is-20 ℃～120 ℃, and this sensor is used for the strain of monitoring shaft tower.
During the utility model work: can in the Substation control unit, adopt the 4th wavelength division multiplexer 12 that the optical communication control signal of 1310nm wave band and the light transducing signal of 1550nm wave band are coupled in the single optical fibre, pass to first basic shaft tower monitoring subsystem by the OPGW optical cable.First basic shaft tower monitoring subsystem separates Control on Communication signal and light transducing signal by the first wavelength division multiplexer 1, the optical communication control signal of 1310nm wave band enters photoelectric conversion module 9 by the first light path selector switch 6, be input to controller 10 after converting the telecommunication control signal to, controller 10 judges whether the Control on Communication signal measures this basic shaft tower, if, controller 10 output transducer control signals also convert light signal to by the second electrooptic conversion module 23, be transported to shaft tower state sensor group through the 3rd light path selector switch 8 again, the light transducing signal of 1550nm wave band is transported to shaft tower state sensor group by the 3rd light path selector switch 8, and shaft tower state sensor group returns to the Substation control unit with the signal that detects by the former road of OPGW optical cable.If controller 10 judgement Control on Communication signals are not this basic shaft towers of measurement then convert the telecommunication control signal to light signal by flowed to follow-up basic shaft tower monitoring subsystem by the second light path selector switch 7, are transported to follow-up basic shaft tower monitoring subsystem via the 3rd light path selector switch 8 with the time transducing signal yet.When detecting second basic shaft tower monitoring subsystem, realize the detection of second basic shaft tower parameter in above-mentioned same mode.
In addition, the utility model with single optical fibre as communication sensing passage, actual is that two on the optical fiber basic shaft tower monitoring subsystems are together in series, when this causes first basic shaft tower monitoring subsystem to break down, the normal basic shaft tower monitoring subsystem in possible back also can't contact with transformer station's main frame, for this state does not occur, the light path selector switch that designs at tower adopts the unstable state photoswitch, when the upper device fails of first Ji Ta, during systemic breakdown, the unstable state photoswitch switches to default setting, be that the first light path selector switch 6 directly links to each other with the second light path selector switch 7 among Fig. 1, make the 1310nm wave band optical signal enter the second basic shaft tower monitoring subsystem by the first light path selector switch 6 and the second light path selector switch 7 and by the second wavelength division multiplexer 2 and the 3rd wavelength division multiplexer 5; The 3rd light path selector switch 8 and the optical fiber that is connected the second wavelength division multiplexer 2 are straight-through, the light signal that makes the 1550nm wave band by and enter the second basic shaft tower monitoring subsystem.The basic shaft tower monitoring subsystem that breaks down does not so affect the communication of system on the follow-up tower and passing through of transducing signal.
The content that this instructions is not described in detail belongs to the known prior art of this area professional and technical personnel.
Claims (5)
1. quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network, it is characterized in that: it comprises the Substation control unit, the first wavelength division multiplexer (1), the second wavelength division multiplexer (2), the 3rd wavelength division multiplexer (5) and two basic shaft tower monitoring subsystems, wherein, described Substation control unit comprises communication control module (3), light signal demodulation module (4) and the 4th wavelength division multiplexer (12), described each basic shaft tower monitoring subsystem comprises the first light path selector switch (6), the second light path selector switch (7), the 3rd light path selector switch (8), photoelectric conversion module (9), controller (10), the first electrooptic conversion module (11), the second electrooptic conversion module (23) and shaft tower state sensor group, wherein, the first light path selector switch (6) connects controller (10) by photoelectric conversion module (9), controller (10) connects the second light path selector switch (7) by the first electrooptic conversion module (11), controller (10) connects the 3rd light path selector switch (8) by the second electrooptic conversion module (23), the first light path selector switch (6) also directly is connected with the second light path selector switch (7), and the signal output part of shaft tower state sensor group connects the 3rd light path selector switch (8); Described communication control module (3) is connected 4 with the light signal demodulation module) connect the first wavelength division multiplexer (1) by the 4th wavelength division multiplexer (12), described the first wavelength division multiplexer (1) connects respectively the first light path selector switch (6) and the 3rd light path selector switch (8) of first basic shaft tower monitoring subsystem, the second light path selector switch (7) of described first basic shaft tower monitoring subsystem connects the 3rd wavelength division multiplexer (5) with the 3rd light path selector switch (8) by the second wavelength division multiplexer (2), and described the 3rd wavelength division multiplexer (5) connects respectively the first light path selector switch (6) and the 3rd light path selector switch (8) of second basic shaft tower monitoring subsystem.
2. quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network according to claim 1, it is characterized in that: described communication control module (3) comprises substation controller (13) and the 3rd electrooptic conversion module (24), described light signal demodulation module (4) comprises wideband light source (14), optical modulator instrument (15) and circulator (16), wherein, described substation controller (13) is by the 3rd electrooptic conversion module (24) access the 4th wavelength division multiplexer (12), and wideband light source (14) and optical modulator instrument (15) are all by circulator (16) access the 4th wavelength division multiplexer (12).
3. quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network according to claim 1, it is characterized in that: described shaft tower state sensor group comprises optical fiber composite insulator mechanical property survey sensor (17), slant optical fiber angular transducer (18), shaft tower strain optical fiber measurement sensor (19), conductor vibration optical fiber measurement sensor (20), wire optical-fiber temperature measuring sensor (21) and electric armour clamp optical-fiber temperature measuring sensor (22).
4. quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network according to claim 1, it is characterized in that: described the 4th wavelength division multiplexer (12) connects the first wavelength division multiplexer (1) by the OPGW optical cable; Described the second wavelength division multiplexer (2) connects the 3rd wavelength division multiplexer (5) by the OPGW optical cable.
5. quasi-distributed ultra-high-tension power transmission line fiber-optic monitoring network according to claim 3, it is characterized in that: described optical fiber composite insulator mechanical property survey sensor (17) is arranged in the shaft tower insulator, described slant optical fiber angular transducer (18) has two, a slant optical fiber angular transducer (18) is arranged on the shaft tower tower head, and another slant optical fiber angular transducer (18) is arranged on the shaft tower middle part.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201979161U CN203203611U (en) | 2013-04-18 | 2013-04-18 | Quasi-distributed high voltage transmission line optical fiber monitoring network |
| PCT/CN2014/075501 WO2014169820A1 (en) | 2013-04-18 | 2014-04-16 | Point-type high-voltage power transmission line optical fiber detection network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201979161U CN203203611U (en) | 2013-04-18 | 2013-04-18 | Quasi-distributed high voltage transmission line optical fiber monitoring network |
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| CN203203611U true CN203203611U (en) | 2013-09-18 |
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| CN2013201979161U Expired - Lifetime CN203203611U (en) | 2013-04-18 | 2013-04-18 | Quasi-distributed high voltage transmission line optical fiber monitoring network |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259609A (en) * | 2013-04-18 | 2013-08-21 | 国家电网公司 | Point type high-voltage transmission line optical fiber detection network |
| WO2014169820A1 (en) * | 2013-04-18 | 2014-10-23 | 国家电网公司 | Point-type high-voltage power transmission line optical fiber detection network |
| CN109193620A (en) * | 2018-08-29 | 2019-01-11 | 中国电力科学研究院有限公司 | A kind of method and system determining transmission line of electricity scheme based on the low sourceless seism of meter wave frequency band |
| CN115032717A (en) * | 2022-06-09 | 2022-09-09 | 国网山东省电力公司电力科学研究院 | Multi-parameter sensing monitoring method and device for power transmission line |
-
2013
- 2013-04-18 CN CN2013201979161U patent/CN203203611U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259609A (en) * | 2013-04-18 | 2013-08-21 | 国家电网公司 | Point type high-voltage transmission line optical fiber detection network |
| WO2014169820A1 (en) * | 2013-04-18 | 2014-10-23 | 国家电网公司 | Point-type high-voltage power transmission line optical fiber detection network |
| CN103259609B (en) * | 2013-04-18 | 2015-05-20 | 国家电网公司 | Point type high-voltage transmission line optical fiber detection network |
| CN109193620A (en) * | 2018-08-29 | 2019-01-11 | 中国电力科学研究院有限公司 | A kind of method and system determining transmission line of electricity scheme based on the low sourceless seism of meter wave frequency band |
| CN109193620B (en) * | 2018-08-29 | 2021-07-13 | 中国电力科学研究院有限公司 | Method and system for determining power transmission line scheme based on meter wave frequency band low passive interference |
| CN115032717A (en) * | 2022-06-09 | 2022-09-09 | 国网山东省电力公司电力科学研究院 | Multi-parameter sensing monitoring method and device for power transmission line |
| CN115032717B (en) * | 2022-06-09 | 2023-12-08 | 国网山东省电力公司电力科学研究院 | Multi-parameter sensing monitoring method and device for power transmission line |
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| C14 | Grant of patent or utility model | ||
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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: STATE GRID EAST INNER MONGOLIA ELECTRIC POWER Co.,Ltd. Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: INNER MONGOLIA EAST POWER Co.,Ltd. Patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute |
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| CX01 | Expiry of patent term |
Granted publication date: 20130918 |
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| CX01 | Expiry of patent term |