CN104965478A - High-voltage direct-current transmission converter valve control device and converter valve - Google Patents
High-voltage direct-current transmission converter valve control device and converter valve Download PDFInfo
- Publication number
- CN104965478A CN104965478A CN201510355224.9A CN201510355224A CN104965478A CN 104965478 A CN104965478 A CN 104965478A CN 201510355224 A CN201510355224 A CN 201510355224A CN 104965478 A CN104965478 A CN 104965478A
- Authority
- CN
- China
- Prior art keywords
- information
- control system
- converter valve
- pole control
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Safety Devices In Control Systems (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a high-voltage direct-current transmission converter valve control device and a converter valve, and belongs to the high-voltage direct-current transmission technology field. An information collection unit is arranged in a converter valve system additionally, and information of all the converter valve monitoring modules is gathered and processed through the information collection unit, and then is uploaded to a pole control system. A received control command sent by the pole control system is subjected to copy and expansion and then is sent to each monitoring module, and consistency and reliability of command sending of the pole control system are ensured. Information interaction between valve control and pole control is achieved through the information collection unit, valve control and pole control interfaces are simplified, the valve control information processing function is determined, thus the valve control system function is independent relatively, and valve control system standard design and modularized expansion are convenient.
Description
Technical field
The present invention relates to a kind of high voltage direct current transmission converter valve opertaing device and converter valve, belong to technical field of HVDC transmission.
Background technology
In extra-high voltage direct-current transmission engineering, converter valve control system is the interfacing equipment of pole control system and converter valve.Major function is the control command of receiving pole Ore-controlling Role, realizes the monitoring and controlling to converter valve and auxiliary device thereof, and monitor message and state of a control are fed back to pole control system.Pole control carries out information interaction with being connected by communication bus and signal wire between valve control.
Converter valve control system configures corresponding converter valve monitoring module according to the converter valve that concrete engineering is dissimilar.In prior art, by converter valve monitoring module directly and pole control system carry out message exchange.A complete converter valve control system comprises multiple monitoring module, is namely communicated to connect respectively by pole control system and numerous monitoring modules.The order of pole control state of a control is issued to valve control system by bus, and system real-time responsiveness is poor.Converter valve monitoring module and pole are controlled connected mode and are fixed, very flexible, and pole control and valve control are redundant system one to one, if there is mistake in the command logic that a system is controlled in pole, cannot Timeliness coverage, and likely can cause serious impact to Operation of Electric Systems.
Summary of the invention
The object of this invention is to provide a kind of high voltage direct current transmission converter valve opertaing device and converter valve, with the problem of numerous the caused straight-flow system poor stability of the interface solving current pole control system and valve control system.
The present invention is for solving the problems of the technologies described above and providing a kind of high voltage direct current transmission converter valve opertaing device, comprise pole control system and valve control system, described valve control system comprises information and collects unit and n converter valve monitoring module, described information collects unit one end and pole control system communicates to connect, the other end that information collects unit is connected with each converter valve monitoring module, for uploading to pole control system by after the information unification aggregation process of each converter valve monitoring module, the control command that the pole control system received sends is issued to each converter valve monitoring module respectively after copying expansion simultaneously.
Described information collects between unit and pole control system and comprises dedicated signaling channel and communication bus, and information collects unit and the information feeding back to pole control system is divided into two classes, and a class is warning that priority is higher, tripping operation information, and this category information adopts signalling channel transmission; One class is the recording events information that priority is lower, and this category information adopts communication bus transmission.
Described information collects unit and comprises Information expansion module, message processing module and communication collection module, described signal extension module is used for converging the data of dedicated signaling channel, copy and forwarding, pole control control signal will be received copy expansion and be issued to each converter valve monitoring module, gather the warning of valve control system, tripping operation information simultaneously, and send it to pole control system; Described signal processing module is connected with signal extension module and the communication of communication collection module by backboard, for by all information aggregation process, and the information after process is sent to pole control system by communication bus; Described communication collection module sends message processing module by backboard after being gathered by the event information of each converter valve monitoring module.
Described information collects between unit and each monitoring module passes through Fiber connection.
Described information collects unit and adopts redundancy to arrange, and two information that redundancy is arranged collect between unit carries out information interaction by signal wire, and carries out Logic judgment according to interactive information to the control command sent under pole control system.
Present invention also offers a kind of converter valve, comprise valve body and converter valve opertaing device, converter valve opertaing device comprises pole control system and valve control system, described valve control system comprises information and collects unit and n converter valve monitoring module, described information collects unit one end and pole control system communicates to connect, the other end that information collects unit is connected with each converter valve monitoring module, for uploading to pole control system by after the information unification aggregation process of each converter valve monitoring module, the control command that the pole control system received sends is issued to each converter valve monitoring module respectively after copying expansion simultaneously.
Described information collects between unit and pole control system and comprises dedicated signaling channel and communication bus, and information collects unit and the information feeding back to pole control system is divided into two classes, and a class is warning that priority is higher, tripping operation information, and this category information adopts signalling channel transmission; One class is the recording events information that priority is lower, and this category information adopts communication bus transmission.
Described information collects unit and comprises Information expansion module, message processing module and communication collection module, described signal extension module is used for converging the data of dedicated signaling channel, copy and forwarding, pole control control signal will be received copy expansion and be issued to each converter valve monitoring module, gather the warning of valve control system, tripping operation information simultaneously, and send it to pole control system; Described signal processing module is connected with signal extension module and the communication of communication collection module by backboard, for by all information aggregation process, and the information after process is sent to pole control system by communication bus; Described communication collection module sends message processing module by backboard after being gathered by the event information of each converter valve monitoring module.
Described information collects between unit and each monitoring module passes through Fiber connection.
Described information collects unit and adopts redundancy to arrange, and two information that redundancy is arranged collect between unit carries out information interaction by signal wire, and carries out Logic judgment according to interactive information to the control command sent under pole control system.
The invention has the beneficial effects as follows: the present invention collects unit by the information of setting up in converter valve system, collect unit by this information and upload to pole control system by after the information unification aggregation process of each converter valve monitoring module, the control command that the pole control system received sends is issued to each monitoring module respectively after copying expansion simultaneously, ensure that consistance and the reliability of pole control transmitting order to lower levels.The present invention by information collect unit realize valve control and pole control between information interaction, simplify valve control and pole control interface, specify the valve control system information processing function, make valve control system function opposite independent, be convenient to valve control system Standardized Design and modularization expansion, improve real-time and the reliability of the information interaction between pole control system and valve control system.
Accompanying drawing explanation
Fig. 1 is the structural representation of converter valve opertaing device in converter valve;
Fig. 2 is the result block diagram that in valve control system, information collects unit.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
The embodiment of a kind of high voltage direct current transmission converter valve opertaing device of the present invention
As shown in Figure 1, high voltage direct current transmission converter valve opertaing device of the present invention comprises pole control system and valve control system, wherein valve control system comprises information and collects unit and n converter valve monitoring module, information collects unit one end and pole control system communicates to connect, the other end that information collects unit is connected with each converter valve monitoring module, for uploading to pole control system by after the information unification aggregation process of each converter valve monitoring module, the control command that the pole control system received sends is issued to each converter valve monitoring module respectively after copying expansion simultaneously.
Information collects between unit and pole control system and comprises dedicated signaling channel and communication bus, and the signal of dedicated signaling channel transmission comprises following characteristics: 1) physical medium is to a transmission signal; 2) signal transmission form adopts modulation signal; 3) signal transmission definition is simple, clear and definite, as transmitted number only includes effective, invalid and channel failure three kinds of states; 4) signal real-time requires high, as pole control control command; 5) signal transacting priority level requires high, as the warning of valve control and trip signal etc.; 6) signal accuracy requirement is high, as controlled valve control from pole for triggering the Trig control signal etc. of turn on thyristors.The message coding signal of communication bus transmission comprises following characteristics: 1) information is accurate, complete, has event recording function; 2) complete message should comprise the equipment state, event trigger, Time To Event etc. when event occurs.According to above information classification, pole control system adopts dedicated signaling channel transmission to the control command of valve control system.The information feeding back to pole control system is divided into two classes by valve control system, and a class is warning that priority is higher, tripping operation information, and this category information adopts signalling channel transmission; One class is the recording events information that priority is lower, and this category information adopts communication bus transmission.Now, pole control system is no longer analyzed the specifying information of valve control system, is processed, as long as directly respond according to the data of the dedicated signaling channel received, will receive information carry out showing by bus communication.
Information collects between the converter valve monitoring module in unit and valve control system passes through Fiber connection, the information connection type collected between unit and each converter valve monitoring module follows the connection between pole control system similar, also dedicated signaling channel and message information passage is divided into, dedicated channel is transferred to information collects the higher warning of the priority of unit for transmitting each converter valve monitoring module, tripping operation information, and the control command that pole control system is sent by information acquisition unit, the recording time information that message information passage monitors for transmitting each converter valve monitoring module.
Information collects the functional module that unit belongs to valve control system, to general-purpose interfaces such as the configurable CAN of pole control system, Profibus buses, its structure as shown in Figure 2, comprise Information expansion module, message processing module and communication collection module, signal extension module is used for converging the data of dedicated signaling channel, copy and forwarding, pole control control signal will be received copy expansion and be issued to each converter valve monitoring module, gather the warning of valve control system, tripping operation information simultaneously, and send it to pole control system; Signal processing module is connected with signal extension module and the communication of communication collection module by backboard, for by all information aggregation process, and the information after process is sent to pole control system by communication bus; Communication collection module sends message processing module by backboard after being gathered by the event information of each converter valve monitoring module.
In order to improve the reliable system of system, information collects unit all adopt redundancy the same as pole control system and arranges, with the pole control system one_to_one corresponding of redundancy, information collects unit and pole control system A communicates to connect, the information of another redundancy collects the pole control system B that unit and redundancy arrange and communicates to connect, two information are collected between unit and are connected by signal wire, the control command information of the pole control system received is exchanged by signal wire, information collects the pole control control command of the message processing module in unit to redundant system and carries out Logic judgment, information unification after process is sent to pole control system by communication bus.
The embodiment of a kind of high voltage direct current transmission converter valve of the present invention
As shown in Figure 1, comprise valve body, pole control system and valve control system, valve control system comprises information and collects unit and n converter valve monitoring module, information collects unit one end and pole control system communicates to connect, the other end that information collects unit is connected with each converter valve monitoring module, for uploading to pole control system by after the information unification aggregation process of each converter valve monitoring module, the control command that the pole control system received sends is issued to each converter valve monitoring module respectively after copying expansion simultaneously.Unit is collected by the information of setting up in converter valve system, collect unit by this information and upload to pole control system by after the information unification aggregation process of each converter valve monitoring module, the control command that the pole control system received sends is issued to each monitoring module respectively after copying expansion simultaneously, ensure that consistance and the reliability of pole control transmitting order to lower levels.By information collect unit realize valve control and pole control between information interaction, simplify valve control and pole control interface, specify the valve control system information processing function, make valve control system function opposite independent, be convenient to valve control system Standardized Design and modularization expansion, improve real-time and the reliability of the information interaction between pole control system and valve control system.Wherein information collects the structure of unit and the course of work was all illustrated in last embodiment, repeats no more here.
Claims (10)
1. a high voltage direct current transmission converter valve opertaing device, comprise pole control system and valve control system, it is characterized in that, described valve control system comprises information and collects unit and n converter valve monitoring module, described information collects unit one end and pole control system communicates to connect, the other end that information collects unit is connected with each converter valve monitoring module, for uploading to pole control system by after the information unification aggregation process of each converter valve monitoring module, the control command that the pole control system received sends is issued to each converter valve monitoring module respectively after copying expansion simultaneously.
2. high voltage direct current transmission converter valve opertaing device according to claim 1, it is characterized in that, described information collects between unit and pole control system and comprises dedicated signaling channel and communication bus, information collects unit and the information feeding back to pole control system is divided into two classes, one class is warning that priority is higher, tripping operation information, and this category information adopts signalling channel transmission; One class is the recording events information that priority is lower, and this category information adopts communication bus transmission.
3. high voltage direct current transmission converter valve opertaing device according to claim 2, it is characterized in that, described information collects unit and comprises Information expansion module, message processing module and communication collection module, described signal extension module is used for converging the data of dedicated signaling channel, copy and forwarding, pole control control signal will be received copy expansion and be issued to each converter valve monitoring module, gather the warning of valve control system, tripping operation information simultaneously, and send it to pole control system; Described signal processing module is connected with signal extension module and the communication of communication collection module by backboard, for by all information aggregation process, and the information after process is sent to pole control system by communication bus; Described communication collection module sends message processing module by backboard after being gathered by the event information of each converter valve monitoring module.
4. high voltage direct current transmission converter valve opertaing device according to claim 3, is characterized in that, described information collects between unit and each monitoring module passes through Fiber connection.
5. the high voltage direct current transmission converter valve opertaing device according to any one of claim 1-4, it is characterized in that, described information collects unit and adopts redundancy to arrange, two information that redundancy is arranged collect between unit carries out information interaction by signal wire, and carries out Logic judgment according to interactive information to the control command sent under pole control system.
6. a converter valve, comprise valve body and converter valve opertaing device, converter valve opertaing device comprises pole control system and valve control system, it is characterized in that, described valve control system comprises information and collects unit and n converter valve monitoring module, described information collects unit one end and pole control system communicates to connect, the other end that information collects unit is connected with each converter valve monitoring module, for uploading to pole control system by after the information unification aggregation process of each converter valve monitoring module, the control command that the pole control system received sends is issued to each converter valve monitoring module respectively after copying expansion simultaneously.
7. converter valve according to claim 6, it is characterized in that, described information collects between unit and pole control system and comprises dedicated signaling channel and communication bus, information collects unit and the information feeding back to pole control system is divided into two classes, one class is warning that priority is higher, tripping operation information, and this category information adopts signalling channel transmission; One class is the recording events information that priority is lower, and this category information adopts communication bus transmission.
8. converter valve according to claim 7, it is characterized in that, described information collects unit and comprises Information expansion module, message processing module and communication collection module, described signal extension module is used for converging the data of dedicated signaling channel, copy and forwarding, pole control control signal will be received copy expansion and be issued to each converter valve monitoring module, gather the warning of valve control system, tripping operation information simultaneously, and send it to pole control system; Described signal processing module is connected with signal extension module and the communication of communication collection module by backboard, for by all information aggregation process, and the information after process is sent to pole control system by communication bus; Described communication collection module sends message processing module by backboard after being gathered by the event information of each converter valve monitoring module.
9. converter valve according to claim 8, is characterized in that, described information collects between unit and each monitoring module passes through Fiber connection.
10. the converter valve according to any one of claim 6-9, it is characterized in that, described information collects unit and adopts redundancy to arrange, two information that redundancy is arranged collect between unit carries out information interaction by signal wire, and carries out Logic judgment according to interactive information to the control command sent under pole control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510355224.9A CN104965478B (en) | 2015-06-24 | 2015-06-24 | A kind of high voltage direct current transmission converter valve control device and converter valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510355224.9A CN104965478B (en) | 2015-06-24 | 2015-06-24 | A kind of high voltage direct current transmission converter valve control device and converter valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104965478A true CN104965478A (en) | 2015-10-07 |
| CN104965478B CN104965478B (en) | 2017-11-07 |
Family
ID=54219517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510355224.9A Active CN104965478B (en) | 2015-06-24 | 2015-06-24 | A kind of high voltage direct current transmission converter valve control device and converter valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104965478B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571673A (en) * | 2015-10-08 | 2017-04-19 | 南京南瑞继保电气有限公司 | Communication no-disturbance recovery method between redundant systems |
| CN106647322A (en) * | 2015-10-29 | 2017-05-10 | 全球能源互联网研究院 | Interface signal simulation module of high-voltage DC power transmission valve control system |
| CN107132791A (en) * | 2017-04-24 | 2017-09-05 | 许继电气股份有限公司 | A kind of change of current control valve device |
| CN108683260A (en) * | 2018-06-13 | 2018-10-19 | 许继集团有限公司 | Suitable for the redundancy control system of direct current transportation, method and management and control device |
| CN112202323A (en) * | 2020-08-25 | 2021-01-08 | 中国南方电网有限责任公司超高压输电公司广州局 | Redundancy improving method for flexible direct current valve control protection system |
| CN115022378A (en) * | 2022-08-03 | 2022-09-06 | 中国南方电网有限责任公司超高压输电公司广州局 | Transmission valve control equipment communication method and system, valve tower monitoring equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110118969A (en) * | 2010-04-26 | 2011-11-02 | 한국생산기술연구원 | Monitoring apparatus for machining fragile material |
| CN103123482A (en) * | 2012-12-12 | 2013-05-29 | 国网智能电网研究院 | Valve monitoring device applicable to high-capacity multi-media card (MMC) flexible direct-current transmission converter |
| CN103869779A (en) * | 2014-03-12 | 2014-06-18 | 南京南瑞继保电气有限公司 | Communication framework and method suitable for modularized multi-level converter control system |
| CN203951269U (en) * | 2014-06-21 | 2014-11-19 | 中国能源建设集团广东省电力设计研究院 | A kind of control protection structure of flexible DC power transmission system current conversion station |
| CN104333205A (en) * | 2014-11-20 | 2015-02-04 | 国家电网公司 | Converter valve stage control device for flexible alternating current power transmission |
-
2015
- 2015-06-24 CN CN201510355224.9A patent/CN104965478B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110118969A (en) * | 2010-04-26 | 2011-11-02 | 한국생산기술연구원 | Monitoring apparatus for machining fragile material |
| CN103123482A (en) * | 2012-12-12 | 2013-05-29 | 国网智能电网研究院 | Valve monitoring device applicable to high-capacity multi-media card (MMC) flexible direct-current transmission converter |
| CN103869779A (en) * | 2014-03-12 | 2014-06-18 | 南京南瑞继保电气有限公司 | Communication framework and method suitable for modularized multi-level converter control system |
| CN203951269U (en) * | 2014-06-21 | 2014-11-19 | 中国能源建设集团广东省电力设计研究院 | A kind of control protection structure of flexible DC power transmission system current conversion station |
| CN104333205A (en) * | 2014-11-20 | 2015-02-04 | 国家电网公司 | Converter valve stage control device for flexible alternating current power transmission |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571673A (en) * | 2015-10-08 | 2017-04-19 | 南京南瑞继保电气有限公司 | Communication no-disturbance recovery method between redundant systems |
| CN106571673B (en) * | 2015-10-08 | 2019-01-25 | 南京南瑞继保电气有限公司 | Non-interference restoring method is communicated between a kind of redundant system |
| CN106647322A (en) * | 2015-10-29 | 2017-05-10 | 全球能源互联网研究院 | Interface signal simulation module of high-voltage DC power transmission valve control system |
| CN107132791A (en) * | 2017-04-24 | 2017-09-05 | 许继电气股份有限公司 | A kind of change of current control valve device |
| CN108683260A (en) * | 2018-06-13 | 2018-10-19 | 许继集团有限公司 | Suitable for the redundancy control system of direct current transportation, method and management and control device |
| CN112202323A (en) * | 2020-08-25 | 2021-01-08 | 中国南方电网有限责任公司超高压输电公司广州局 | Redundancy improving method for flexible direct current valve control protection system |
| CN115022378A (en) * | 2022-08-03 | 2022-09-06 | 中国南方电网有限责任公司超高压输电公司广州局 | Transmission valve control equipment communication method and system, valve tower monitoring equipment and storage medium |
| CN115022378B (en) * | 2022-08-03 | 2022-11-15 | 中国南方电网有限责任公司超高压输电公司广州局 | Transmission valve control equipment communication method and system, valve tower monitoring equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104965478B (en) | 2017-11-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104965478A (en) | High-voltage direct-current transmission converter valve control device and converter valve | |
| CN101964543B (en) | HVDC thyristor valve base electronic equipment system | |
| CN103869781A (en) | Non-similar three-redundancy onboard electric load management center | |
| CN104865958A (en) | Matrix switch device, system and method | |
| CN103926853A (en) | Programmable resistance output device and method | |
| CN111948993B (en) | Sample processing pipeline control system | |
| CN104954168B (en) | A kind of communication failure navigation system based on packet parsing | |
| CN109104303A (en) | A kind of automatic configuration system and method for CAN bus ID | |
| CN107203128B (en) | Electronic fuel regulator based on ARM and CPLD dual-processor redundancy | |
| CN104158670A (en) | Gigabit Ethernet bypass device | |
| CN103401748A (en) | Shield machine hot standby control system and method | |
| CN204243908U (en) | A kind of electric instrument Fieldbus Intelligent Selected Inspection device | |
| CN102710618A (en) | Device for protocol conversion from Ethernet to RS485 field bus | |
| CN102420595A (en) | Pulse width modulation coding device | |
| CN108616435A (en) | Double redundant system data transmission methods based on high-speed serial bus | |
| CN216901647U (en) | Signal multiplexing and automatic switching circuit | |
| CN105720683A (en) | Device for intelligently selecting and inspecting onsite bus of electric power meter | |
| CN105629913A (en) | Railway machine room signal power supply and environment monitoring system | |
| CN109407643A (en) | A kind of industrial data acquisition system based on NB-IoT | |
| CN209044319U (en) | A kind of isolation switch device having more board information monitorings | |
| CN114039336A (en) | Integrated relay, control method and relay protection device | |
| CN102622898A (en) | Unique yellow-flash controller of signaler and signaler with same | |
| CN202488414U (en) | Pulse-width modulation coding device | |
| CN109828448A (en) | A kind of isolation switch device having more board information monitorings | |
| CN104362740A (en) | Direct-current power transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Meng Xuelei Inventor after: Dong Chaoyang Inventor after: Wei Zhuo Inventor after: Tang Baoguo Inventor after: Song Jianyong Inventor after: Li Shengyu Inventor after: Ran Xianxian Inventor before: Meng Xuelei Inventor before: Dong Chaoyang Inventor before: Wei Zhuo Inventor before: Song Jianyong Inventor before: Li Shengyu Inventor before: Ran Xianxian |
|
| COR | Change of bibliographic data | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160325 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant after: Xuji Group Co., Ltd. Applicant after: State Grid Corporation of China Applicant after: STATE GRID SHANXI ELECTRIC POWER CO., LTD. Applicant after: Xuji Electric Co., Ltd. Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant before: Xuji Electric Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |