CN205195110U - But photovoltaic power plant box -type substation of remote control, telemetering measurement and remote signalling - Google Patents
But photovoltaic power plant box -type substation of remote control, telemetering measurement and remote signalling Download PDFInfo
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- CN205195110U CN205195110U CN201520980687.XU CN201520980687U CN205195110U CN 205195110 U CN205195110 U CN 205195110U CN 201520980687 U CN201520980687 U CN 201520980687U CN 205195110 U CN205195110 U CN 205195110U
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
Abstract
The utility model discloses a but photovoltaic power plant box -type substation of remote control, telemetering measurement and remote signalling adopts simple, practicality ground method, utilizes metering device, the comprehensive communication interface who then breaks even the body on the one hand, and on the other hand increases a control of taking communication interface's miniature PLC realization surplus components and parts. Realize remote control high -pressure side circuit breaker, the long -range disconnection of low tension side circuit breaker, closure, the electric parameters's of telemetering measurement high -pressure side, low tension side circuit detection, the running state of remote signalling high -pressure side circuit breaker, malfunction, energy memory's energy storage state, the temperature or the gas detection of transformer, the running state of low tension side circuit breaker, malfunction, low tension side surge protector's running state, the conflagration of hyperbaric chamber, transformer room, low -pressure chamber is kept watch on.
Description
Technical field
This practical information belongs to photovoltaic plant technical field, is specifically related to the photovoltaic plant box-type substation of a kind of remote-controlled, remote measurement and remote signalling.
Background technology
China's photovoltaic industry fast development; to the energy supply of increase China, readjusting the energy structure and preserving the ecological environment serves positive role; owing to being subject to the impact of meteorological specific factor; the many places at northwest and the natural conditions rather harsh such as coastal of photovoltaic project; and dispersion is compared in the distribution in power station; and the place distance device context of office administration is comparatively far away, generally the rarest several kilometers far away, the inconvenience caused equipment control and operation of handling official business at a distance.
In photovoltaic DC field, each photovoltaic array can configure a box type transformer and two inverters and multiple stage header box, and in the operation of the box type transformer that photovoltaic array is joined, have the factor of a lot of causing trouble, so in order to the stability that improves box type transformer work and fail safe, each box type transformer can configure an intelligent monitoring unit, the factor of these possibility causing trouble is monitored and protected, not integrated due to box type transformer centralized control system, and the function of each instrument and meter is relatively single, mutual communication particularly between each device is more loaded down with trivial details, directly affects the reliability of whole box type transformer system cloud gray model, add the difficulty of the real-time monitor and managment of staff.
Summary of the invention:
The purpose of this utility model is to provide the photovoltaic plant box-type substation of a kind of remote-controlled, remote measurement and remote signalling, can carry out remote control, remote measurement, remote signalling and fire monitor, to overcome Problems existing in background technology box-type substation.
To achieve these goals, the technical solution of the utility model is:
A kind of remote-controlled, the photovoltaic plant box-type substation of remote measurement and remote signalling, comprise transformer station box, casing comprises low-pressure chamber, transformer room and hyperbaric chamber, be arranged on the stand-by power supply of low-pressure chamber, low-pressure side output loop, and be arranged on the high-pressure side output loop in hyperbaric chamber, it is characterized in that: also comprise the communication manager and PLC that are interconnected and carry out two-way communication, first digital power instrument, second digital power instrument, the signal input part of the 3rd digital power Instrument connection communication manager, comprehensive relay protection device connecting communication supervisor carries out two-way communication, first digital power instrument is connected two groups of low-pressure side output loops with the second digital power instrument respectively each via the first current transformer and the second current transformer, and the 3rd digital power instrument is connected one group of high-pressure side output loop with comprehensive relay protection device by high-tension current inductor.
Preferably, the first low-voltage circuit breaker is provided with in the first loop, current transformer place, Stateful Inspection contact and the fault monitoring contact of the first low-voltage circuit breaker are connected two signal input parts of PLC respectively, and the first low-voltage circuit breaker connects the control signal output of PLC by the first motor switch operating mechanism;
The second low-voltage circuit breaker is provided with in the second loop, current transformer place, Stateful Inspection contact and the fault monitoring contact of the second low-voltage circuit breaker are connected two signal input parts of PLC respectively, and the second low-voltage circuit breaker connects the control signal output of PLC by the second motor switch operating mechanism;
Preferably, primary cut-out is provided with in loop, high-tension current inductor place, Stateful Inspection contact and the fault monitoring contact of primary cut-out are connected two signal input parts of PLC respectively, and the combined floodgate separating brake of primary cut-out monitors that contact and spring energy-storage monitor that contact is connected to the primary cut-out monitoring circuit of comprehensive relay protection device;
The signal input part of the primary cut-out monitoring circuit connecting communication supervisor of comprehensive relay protection device, the control signal output of the primary cut-out drive circuit connecting communication supervisor of comprehensive relay protection device.
Preferably; two groups of low-pressure side output loops are parallel with an electric capacity protector respectively; be designated as the first electric capacity protector and the second electric capacity protector, the Stateful Inspection contact of the first electric capacity protector and the second electric capacity protector is connected to two signal input parts of PLC.
Preferably, be respectively equipped with fire monitor in low-pressure chamber, transformer room and hyperbaric chamber, each fire monitor is connected with PLC and communicates.
Preferably; comprehensive relay protection device also comprises the light gas alarming of transformer high temperature alarm, superhigh temperature or oil-immersed type transformer and superhigh temperature grave gas trip circuit, high-tension line overcurrent, short circuit, zero sequence, passive moods, under voltage, overvoltage protection, inside transformer short-circuit protection and low-voltage busbar short-circuit protection circuit.
Preferably, the first digital power instrument, the second digital power instrument, the 3rd digital power instrument are all connected by the RS485 interface of RS485 Interface and Controler with comprehensive relay protection device.
Preferably, stand-by power supply is UPS uninterrupted power supply, for comprehensive relay protection device and communication manager provide power supply.
The beneficial effects of the utility model are: adopt simply, practicably method, and utilize the communication interface of measuring instrument, comprehensive relay protection itself on the one hand, the weak signal testing increasing a band communication interface on the other hand realizes the monitoring remaining components and parts.Realize the long-range disconnection, closed of telecontrol high-voltage side circuit breaker, low-pressure side circuit breaker; The detection of the parameters of electric power of remote measurement high-pressure side, low-pressure side circuit; The energy storage state of the running status of remote signalling high-pressure side circuit breaker, malfunction, energy storage device; the temperature of transformer or gas management; the running status of low-pressure side circuit breaker, malfunction, the running status of low-pressure side surge protector, the fire of hyperbaric chamber, transformer room, low-pressure chamber monitors.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment,
Fig. 2 is the circuit theory diagrams of the utility model embodiment,
Fig. 3 is the winding diagram of the utility model embodiment digital instrument, comprehensive relay protection device and PLC,
Fig. 4 is the syndeton schematic diagram of the comprehensive relay protection device of the utility model embodiment and communications manager,
Fig. 5 is the primary cut-out monitoring circuit of the comprehensive relay protection device of the utility model embodiment,
Fig. 6 is the electric current input circuit of the 3rd digital power instrument of the comprehensive relay protection device of the utility model embodiment,
Fig. 7 is the three-phase current input circuit of the comprehensive relay protection device of the utility model embodiment,
Fig. 8 is the zero-sequence current input circuit of the comprehensive relay protection device of the utility model embodiment,
Fig. 9 is the voltage input circuit of the 3rd digital power instrument of the comprehensive relay protection device of the utility model embodiment,
Figure 10 is the primary cut-out drive circuit of the comprehensive relay protection device of the utility model embodiment,
Figure 11 is high-tension switch cabinet intraoral illumination and the temperature-control circuit of the comprehensive relay protection device of the utility model embodiment,
Figure 12 is the external structure schematic diagram of the utility model embodiment casing.
In figure: 1-PLC controller, 2-communication manager, 3-first digital power instrument, 4-second digital power instrument, 5-the 3rd digital power instrument, the comprehensive relay protection device of 6-, 61-primary cut-out monitoring circuit, 62-primary cut-out drive circuit, 63-transformer high temperature alarm, superhigh temperature or the light gas alarming of oil-immersed type transformer and superhigh temperature grave gas trip circuit, 64-high-tension line overcurrent, short circuit, zero sequence, passive moods, under voltage, overvoltage protection, inside transformer short-circuit protection and low-voltage busbar short-circuit protection circuit, 7-low-pressure chamber, 8-transformer room, 9-hyperbaric chamber, 10-first current transformer, 11-second current transformer, 12-high-tension current inductor, 13-first low-voltage circuit breaker, the Stateful Inspection contact of 131-first low-voltage circuit breaker and fault monitoring contact, 132-first motor switch operating mechanism, 14-second low-voltage circuit breaker, the Stateful Inspection contact of 141-second low-voltage circuit breaker and fault monitoring contact, 142-second motor switch operating mechanism, 15-primary cut-out, the combined floodgate separating brake of 151-primary cut-out monitors that contact and spring energy-storage monitor contact, 16-first electric capacity protector, 17-second electric capacity protector, 18-low-pressure chamber fire monitor, 19-transformer room fire monitor, 20-hyperbaric chamber fire monitor, 21-stand-by power supply.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
Below in conjunction with drawings and Examples, the utility model is described further.
A kind of remote-controlled, the photovoltaic plant box-type substation of remote measurement and remote signalling as shown in Figure 1 to Figure 3, comprise transformer station box, casing comprises low-pressure chamber 7, transformer room 8 and hyperbaric chamber 9, be arranged on the stand-by power supply 21 of low-pressure chamber 7, low-pressure side output loop, and be arranged on the high-pressure side output loop in hyperbaric chamber 9, it is characterized in that: also comprise the communication manager 2 and PLC 1 that are interconnected and carry out two-way communication, first digital power instrument 3, second digital power instrument 4, the signal input part of the 3rd digital power instrument 5 connecting communication supervisor 2, comprehensive relay protection device 6 connecting communication supervisor 2 carries out two-way communication, first digital power instrument 3 is respectively connected two group low-pressure side output loops each via the first current transformer 10 with the second current transformer 11 with the second digital power instrument 4, and the 3rd digital power instrument 5 is connected one group of high-pressure side output loop with comprehensive relay protection device 6 by high-tension current inductor 12.And comprehensive relay protection is arranged on the inner high voltage switch cabinet panel of interval, type transformer substation high-voltage room 9, to be arranged in box-type substation low-pressure chamber 7 interval on low tension switch cabinet panel.
Acting as of three digital electric instruments:
1). measure in real time: each phase of phase, line voltage and mean value, the each phase of electric current, average and center line value, each phase of meritorious, idle, apparent power and three-phase total value, each phase of power factor and system value, frequency: system frequency, load characteristic: resistive, perceptual, capacitive.
2) electric energy is shown: meritorious, reactive energy.
3) quality of power supply: percent harmonic distortion, 2 ~ 31 subharmonic containing ratios, three-phase voltage, current imbalance rate.
4) dynamically input, to export: low-pressure side instrument should have the dividing of the work that detects this circuit switching and malfunction and control switch, closing function.
The first low-voltage circuit breaker 13 is provided with in the first loop, current transformer 10 place, Stateful Inspection contact and the fault monitoring contact 131 of the first low-voltage circuit breaker are connected two signal input parts of PLC 1 respectively, and the first low-voltage circuit breaker 13 connects the control signal output of PLC 1 by the first motor switch operating mechanism 132;
The second low-voltage circuit breaker 14 is provided with in the second loop, current transformer 11 place, Stateful Inspection contact and the fault monitoring contact 141 of the second low-voltage circuit breaker are connected two signal input parts of PLC 1 respectively, and the second low-voltage circuit breaker 14 connects the control signal output of PLC 1 by the second motor switch operating mechanism 142;
Two groups of low-pressure side output loops are parallel with an electric capacity protector respectively; the Stateful Inspection contact being designated as the first electric capacity protector 16 and the second electric capacity protector 17, first electric capacity protector 16 and the second electric capacity protector 17 is connected to two signal input parts of PLC 1.
Primary cut-out 15 is provided with in loop, high-tension current inductor 12 place, Stateful Inspection contact and the fault monitoring contact of primary cut-out 15 are connected two signal input parts of PLC 1 respectively, and primary cut-out combined floodgate separating brake monitors that contact and spring energy-storage monitor that contact 151 is connected to the primary cut-out monitoring circuit 61 of comprehensive relay protection device;
The signal input part of the primary cut-out monitoring circuit 61 connecting communication supervisor 2 of comprehensive relay protection device as shown in Figure 4, the control signal output of the high pressure open circuit drive circuit 6262 connecting communication supervisor 2 of comprehensive relay protection device.Comprehensive relay protection device also comprises the light gas alarming of transformer high temperature alarm, superhigh temperature or oil-immersed type transformer and superhigh temperature grave gas trip circuit 63, high-tension line overcurrent, short circuit, zero sequence, passive moods, under voltage, overvoltage protection, inside transformer short-circuit protection and low-voltage busbar short-circuit protection circuit 64.Act as: protection high-tension line and transformer, avoid causing power equipment to damage because of high-voltage line fault or transformer fault.Main protection has: overcurrent protection, short-circuit protection, ground protection, overvoltage protection, under voltage protection etc., and when there is above-mentioned fault, comprehensive relay protection disconnects high side switch in time, and protection power equipment exempts from damage.As shown in Figure 11-Figure 5, comprehensive relay protection device comprises following circuit: primary cut-out monitoring circuit 61, comprises comprehensive relay protection power supply, high-voltage switch gear divide-shut brake controls and trip protection circuit, high-voltage switch gear Stateful Inspection and transformer protection circuit; The electric current input circuit of the 3rd digital power instrument 5; Three-phase current input circuit, current transformer is enclosed within every phase busbar respectively; Zero-sequence current input circuit, current transformer is enclosed within outside outlet cable and puts; The voltage input circuit of the 3rd digital power instrument 5; High pressure open circuit drive circuit 6262; High-tension switch cabinet intraoral illumination and temperature-control circuit.
Be respectively equipped with fire monitor in low-pressure chamber 7, transformer room 8 and hyperbaric chamber 9 as shown in Figure 2, each fire monitor is connected with PLC 1 and communicates.Photovoltaic generation box-type substation is divided into three intervals as shown in figure 12, be respectively interval, hyperbaric chamber 9, interval, transformer room 8 and low-pressure chamber 7 interval, arrange low-pressure chamber fire monitor 18, transformer room's fire monitor 19 and hyperbaric chamber fire monitor 20 respectively, free-standing smoke detector carries out fire monitoring to three intervals respectively and reports to the police.
First digital power instrument 3, second digital power instrument 4, the 3rd digital power instrument 5 are all connected by the RS485 interface of RS485 Interface and Controler with comprehensive relay protection device 6 as shown in Figure 2.
Stand-by power supply 21 is UPS uninterrupted power supply, for comprehensive relay protection device and communication manager 2 provide power supply.UPS (uninterrupted power supply) capacity is 2kVA, and its effect is that the video monitoring system for installing near the comprehensive relay protection in box-type substation, the communication manager 2 in communication box and optical fiber switch and box-type substation provides power supply.The low-tension switch cabinet that UPS (uninterrupted power supply) is arranged in box-type substation low-pressure chamber 7 interval is inner.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to the utility model claims.The part be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. one kind remote-controlled, the photovoltaic plant box-type substation of remote measurement and remote signalling, comprise transformer station box, described casing comprises low-pressure chamber (7), transformer room (8) and hyperbaric chamber (9), be arranged on the stand-by power supply (21) of low-pressure chamber (7), low-pressure side output loop, and be arranged on the high-pressure side output loop in hyperbaric chamber (9), it is characterized in that: also comprise the communication manager (2) and PLC (1) that are interconnected and carry out two-way communication, first digital power instrument (3), second digital power instrument (4), 3rd digital power instrument (5) connects the signal input part of described communication manager (2), comprehensive relay protection device (6) connects described communication manager (2) and carries out two-way communication, described first digital power instrument (3) is respectively connected two group low-pressure side output loops each via the first current transformer (10) with the second current transformer (11) with described second digital power instrument (4), and described 3rd digital power instrument (5) is connected one group of high-pressure side output loop with described comprehensive relay protection device (6) by high-tension current inductor (12).
2. the photovoltaic plant box-type substation of a kind of remote-controlled, remote measurement according to claim 1 and remote signalling, is characterized in that:
The first low-voltage circuit breaker (13) is provided with in described first current transformer (10) loop, place, Stateful Inspection contact and fault monitoring contact (131) of described first low-voltage circuit breaker are connected two signal input parts of described PLC (1) respectively, and described first low-voltage circuit breaker (13) connects the control signal output of described PLC (1) by the first motor switch operating mechanism (132);
The second low-voltage circuit breaker (14) is provided with in described second current transformer (11) loop, place, Stateful Inspection contact and fault monitoring contact (141) of described second low-voltage circuit breaker are connected two signal input parts of described PLC (1) respectively, and described second low-voltage circuit breaker (14) connects the control signal output of described PLC (1) by the second motor switch operating mechanism (142);
3. one according to claim 1 is remote-controlled, the photovoltaic plant box-type substation of remote measurement and remote signalling, it is characterized in that: be provided with primary cut-out (15) in described high-tension current inductor (12) loop, place, Stateful Inspection contact and the fault monitoring contact of described primary cut-out (15) are connected two signal input parts of described PLC (1) respectively, the combined floodgate separating brake of described primary cut-out monitors that contact and spring energy-storage monitor that contact (151) is connected to primary cut-out (15) monitoring circuit (61) of described comprehensive relay protection device (6),
Primary cut-out (15) monitoring circuit (61) of described comprehensive relay protection device (6) connects the signal input part of described communication manager (2), and the primary cut-out drive circuit (62) of described comprehensive relay protection device (6) connects the control signal output of described communication manager (2).
4. the photovoltaic plant box-type substation of a kind of remote-controlled, remote measurement according to claim 1 and remote signalling; it is characterized in that: low-pressure side output loop described in two groups is parallel with an electric capacity protector respectively; be designated as the first electric capacity protector (16) and the second electric capacity protector (17), the Stateful Inspection contact of described first electric capacity protector (16) and the second electric capacity protector (17) is connected to two signal input parts of described PLC (1).
5. the photovoltaic plant box-type substation of a kind of remote-controlled, remote measurement according to claim 1 and remote signalling, it is characterized in that: be respectively equipped with fire monitor in described low-pressure chamber (7), described transformer room (8) and described hyperbaric chamber (9), fire monitor described in each is connected with described PLC (1) and communicates.
6. the photovoltaic plant box-type substation of a kind of remote-controlled, remote measurement according to claim 1 and remote signalling; it is characterized in that; described comprehensive relay protection device (6) also comprises: the light gas alarming of transformer high temperature alarm, superhigh temperature or oil-immersed type transformer and superhigh temperature grave gas trip circuit (63), high-tension line overcurrent, short circuit, zero sequence, passive moods, under voltage, overvoltage protection, inside transformer short-circuit protection and low-voltage busbar short-circuit protection circuit (64).
7. the photovoltaic plant box-type substation of a kind of remote-controlled, remote measurement according to claim 1 and remote signalling, it is characterized in that: described first digital power instrument (3), the second digital power instrument (4), the 3rd digital power instrument (5) are all connected with the RS485 interface of described controller by RS485 interface with comprehensive relay protection device (6).
8. the photovoltaic plant box-type substation of a kind of remote-controlled, remote measurement according to claim 1 and remote signalling, it is characterized in that: described stand-by power supply (21) is UPS uninterrupted power supply, for described comprehensive relay protection device (6) and described communication manager (2) provide power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520980687.XU CN205195110U (en) | 2015-11-30 | 2015-11-30 | But photovoltaic power plant box -type substation of remote control, telemetering measurement and remote signalling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520980687.XU CN205195110U (en) | 2015-11-30 | 2015-11-30 | But photovoltaic power plant box -type substation of remote control, telemetering measurement and remote signalling |
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| CN205195110U true CN205195110U (en) | 2016-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520980687.XU Active CN205195110U (en) | 2015-11-30 | 2015-11-30 | But photovoltaic power plant box -type substation of remote control, telemetering measurement and remote signalling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818421A (en) * | 2019-04-01 | 2019-05-28 | 安徽九翔信息科技有限责任公司 | A kind of computer monitoring power protection system |
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2015
- 2015-11-30 CN CN201520980687.XU patent/CN205195110U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818421A (en) * | 2019-04-01 | 2019-05-28 | 安徽九翔信息科技有限责任公司 | A kind of computer monitoring power protection system |
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Effective date of registration: 20211231 Address after: 430056, No. 1, Dongfeng central, No. three Dongfeng Road, Wuhan economic and Technological Development Zone, Hubei, Wuhan, A Patentee after: Wuhan Dongyan intelligent design and Research Institute Co.,Ltd. Address before: 430056 Wuhan City, Hubei Province block a, Donghe center, No. 1, Dongfeng Third Road, Wuhan Economic and Technological Development Zone, Hubei Province Patentee before: DONGFENG DESIGN INSTITUTE Co.,Ltd. |