CN104716652A - Magnetically controlled shunt reactor - Google Patents
Magnetically controlled shunt reactor Download PDFInfo
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- CN104716652A CN104716652A CN201310672145.1A CN201310672145A CN104716652A CN 104716652 A CN104716652 A CN 104716652A CN 201310672145 A CN201310672145 A CN 201310672145A CN 104716652 A CN104716652 A CN 104716652A
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- parallel reactors
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- 230000005284 excitation Effects 0.000 claims abstract description 68
- 238000004804 winding Methods 0.000 claims abstract description 67
- 239000003990 capacitor Substances 0.000 claims abstract description 4
- 230000001447 compensatory effect Effects 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000008447 perception Effects 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
- H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias
-
- 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
- Y02E40/30—Reactive power compensation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a magnetically controlled shunt reactor. The magnetically controlled shunt reactor comprises a magnetically controlled shunt reactor body, an excitation system and a control and protection system. The magnetically controlled shunt reactor body is of a three-phase-winding structure. The magnetically controlled shunt reactor body comprises a high-voltage side winding , a control winding and a compensation winding. The excitation system comprises a self-excitation system provided with an alternating current side connected with the compensation winding and an external-excitation system connected with a station power source. A direct current side of the excitation system is directly connected with the control winding. The compensation winding is connected with the alternating current side of the self-excitation system, and can be connected with a shunt capacitor or a filter. The control and protection system of the magnetically controlled shunt reactor conducts analytical calculation based on detecting results of a voltage or a current, adjusts a control part of the excitation system based on the calculation results, changes a triggering angle of a rectifier, and adjusts an output capacity of the magnetically controlled shunt reactor, so that the aims that the output capacity is continuous and the adjustment is smooth is achieved. The magnetically controlled shunt reactor is applicable to a bus reactor for achieving a reactive-voltage control of an ultra / extra-high voltage power transmission system.
Description
Technical field:
The invention belongs to a kind of reactor, particularly relate to the magnet controlled controlled parallel reactor device that a kind of self-excitation combines with outer excitation mode.
Background technology:
Controllable parallel reactors is a kind of novel flexible ac transmission system (FACTS) device, effectively can solve a reactive power/voltage control difficult problem and the contradiction between reactive power compensation and over-voltage in ultra-high/extra-high voltage transmission system, improve voltage stability level and transient state operational limit, reduce circuit transport loss, balance idle, and effectively can alleviate the pressure of management and running, be one of the important technical realizing superhigh pressure and UHV transmission channel security, efficient, economical operation.The most concentrated application of controllable parallel reactors comprises: ultra-high/extra-high voltage long distance heavy-haul line, wind-powered electricity generation concentrate transfer passage, water power transfer passage, ultra-high/extra-high voltage compact line etc.
According to principle and technology path different demarcation, controllable parallel reactors can be divided into magnet controlled controllable parallel reactors (Magnetically Controlled Shunt Reactor, MCSR), stagewise controllable parallel reactors (Stepped Controlled Shunt Reactor, and thyristor control transformer (Thyristor Controlled Transformer, TCT) formula controllable parallel reactors three kinds of versions SCSR).Wherein, magnet controlled controllable parallel reactors can realize output capacity continuously, smooth adjustment, be suitable as bus reactor and realize the application of ultra-high/extra-high voltage transmission system reactive power/voltage control.
Magnet controlled controllable parallel reactors changes core saturation by the size controlling DC excitation electric current, thus realize the continuous adjustment of its reactance value and output capacity, therefore, the stability of excitation system and reliability directly affect magnet controlled controllable parallel reactors ruuning situation in systems in which.The excitation system that the excitation system of the magnet controlled controllable parallel reactors of superhigh pressure generally adopts single power supply to power, this system mainly comprises AC power and takes from the self-excitation mode that the outer excitation mode of Substation Station electricity consumption electric power system and AC power take from self winding of magnet controlled controllable parallel reactors.
Outer excitation mode adds the dependence of magnet controlled controllable parallel reactors capacity regulating to power supply in station, after power supply breaks down in station, can affect the output capacity of magnet controlled controllable parallel reactors and normally run; In these more external built switchyards, the station electric power system capacity that first stage of construction is selected is less, can not meet the requirement of excitation system to power supply capacity.
In self-excitation mode, the AC power of its rectification unit takes from magnet controlled controllable parallel reactors body controlled winding or compensative winding.But when faults such as magnet controlled controllable parallel reactors place transmission line generation single-phase earthings, because fault effects may affect the reliability of self-excitation mode AC power.
In sum, the present invention proposes a kind of magnet controlled controllable parallel reactors can overcome above-mentioned shortcoming, and obviously can promote stability and the reliability of the work of magnet controlled controllable parallel reactors excitation system.
Summary of the invention:
The object of this invention is to provide a kind of magnet controlled controllable parallel reactors, this reactor changes the degree of saturation of core of reactor by controlling excitation system, realize reactance value step-less adjustment, can realize output capacity continuously, smooth adjustment, be applicable to being applied to bus reactor and realize ultra-high/extra-high voltage transmission system reactive power/voltage control.
For achieving the above object, the present invention is by the following technical solutions: a kind of magnet controlled controllable parallel reactors, the Control protection system comprising magnet controlled controllable parallel reactors body, excitation system and be connected with described excitation system, described body is three winding structure, comprises high-pressure side winding, controlled winding and compensative winding; Described excitation system comprises the self-excitation system that AC is connected with described compensative winding respectively and the outer excitation system be connected with station power supply.
The magnet controlled controllable parallel reactors of one provided by the invention, described self-excitation system can configure two cover self-excitation systems, realizes quick switching by triggering or locking pulse; When the self-excitation system failure described in one of them, switch another described self-excitation system for subsequent use immediately; Described self-excitation system obtains AC power by the compensative winding of described body.
The magnet controlled controllable parallel reactors of one provided by the invention, the excitation system control section that described self-excitation system comprises the self-excitation rectifier transformer be connected with described compensative winding, the self-excitation rectifying device be connected with described rectifier transformer and is connected with described self-excitation rectifying device; Described self-excitation rectifying device DC output side is connected with described controlled winding.
Another preferred a kind of magnet controlled controllable parallel reactors provided by the invention, described outer excitation system comprises the outer exciting rectifier transformer be connected with station power supply, the outer excitation rectifier device be connected with described outer exciting rectifier transformer, the excitation system control section that is connected with described outer excitation rectifier device; Described outer excitation rectifier device DC output side is connected with described controlled winding; The AC power slave station power supply of outer excitation system obtains, for described controlled winding provides control electric current.
Another preferred a kind of magnet controlled controllable parallel reactors provided by the invention, described high pressure winding is directly connected with the electric power system of application, and described high pressure winding electric pressure is the highest.
A preferred a kind of magnet controlled controllable parallel reactors more provided by the invention, described compensative winding is the tertiary winding that triangle connects, and it connects filter or Shunt Capacitor Unit; Described compensative winding provides the reactive power of perception for excitation system, expands the capacity regulating scope of magnet controlled controllable parallel reactors; The path of harmonic current is provided, reduces the harmonic component of injected system in magnet controlled controllable parallel reactors work, reduce controllable parallel reactors to the harmonic pollution of system, improve the quality of power supply of system.
The magnet controlled controllable parallel reactors of another preferred one provided by the invention, is characterized in that: described outer excitation system uses when described magnet controlled controllable parallel reactors first time drops into or drops into after fault; When described magnet controlled controllable parallel reactors stable operation or capacity reach requirement, be just switched to described self-excitation system.
The magnet controlled controllable parallel reactors of another preferred one provided by the invention; it is characterized in that: described Control protection system carries out analytical calculation according to the testing result of voltage or electric current; obtain the control section that result of calculation goes to regulate excitation system; change the trigger angle of rectifier; regulate the output capacity of controllable parallel reactors, thus systems stabilisation voltage and reactive power compensation.
With immediate prior art ratio, the invention provides technical scheme and there is following excellent effect
With immediate prior art ratio, the invention provides technical scheme and there is following excellent effect
1, the reactor in the present invention can regulate reactor output capacity in continuously smooth ground, suppresses system voltage fluctuation, and the coordination optimization realizing full station reactive voltage controls; ;
2, be switched to outer excitation system when magnet controlled controllable parallel reactors first time drops into, do not rely on external power supply, little to station electricity consumption electric power system capacity requirement, stability and reliability high;
3, the reactor technology trends in the present invention is good, and be adapted at transformer station and switchyard application, in China, ultra-high/extra-high voltage transmission system has a good application prospect;
4, the compensative winding in the present invention can also be installed filter or shunt reactor group, expand reactive power compensation scope, improve system power quality;
5, the control system of reactor of the present invention adopts low-voltage equipment to control high-tension apparatus, and device macroeconomic is better.
Accompanying drawing explanation
Fig. 1 is the present invention's magnet controlled controllable parallel reactors main circuit structure figure.
Embodiment
Below in conjunction with embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in Figure 1, the magnet controlled controllable parallel reactors of invention of this example, comprise magnet controlled controllable parallel reactors body, excitation system and Control protection system, described main body is three-phase windings structure, comprises source side winding, controlled winding and compensative winding, described source side winding is the winding that body is directly connected with the electric power system of application, this winding voltage the highest grade general, be also referred to as high pressure winding, controlled winding is the winding that body is directly connected with excitation system DC side, described compensative winding is the tertiary winding, triangle connects, be mainly triple harmonic current and path is provided, eliminate third-harmonic flux, compensative winding connects filter or Shunt Capacitor Unit, the reactive power of perception is provided to system on the one hand, expand the capacity regulating scope of magnet controlled controllable parallel reactors, the path of harmonic current is provided on the other hand, reduce the harmonic component of injected system in magnet controlled controllable parallel reactors work, reduce controllable parallel reactors to the harmonic pollution of system, the quality of power supply of raising system.Control protection system is also important part; testing result according to voltage or electric current carries out analytical calculation; obtain the control section that result of calculation goes to regulate excitation system; change the trigger angle of rectifier; regulate the output capacity of controllable parallel reactors, thus systems stabilisation voltage and reactive power compensation.
Described excitation system comprises the self-excitation system be connected with described compensative winding and the outer excitation system be connected with described station power supply.
Described self-excitation system is for improve reliability further, two cover self-excitation rectification unit on-line redundances can be set, adopt a master one standby, main self-excitation rectification unit goes wrong, self-excitation rectification unit for subsequent use comes into operation immediately, the two does not have circuit breaker or contactor to switch, but realizes quick switching by triggering or locking pulse.Described self-excitation rectification unit obtains AC power by the compensative winding of described body; When described self-excitation system jam, the outer excitation system in stand-by heat can also be switched to fast and excise described self-excitation system, ensureing the normal operation of magnet controlled controllable parallel reactors, realized the hotline maintenance of excitation system simultaneously by switching manipulation.
The excitation system control section that described self-excitation system comprises the self-excitation rectifier transformer be connected with described compensative winding, the self-excitation rectifying device be connected with described self-excitation rectifier transformer and is connected with described self-excitation rectifying device; Described self-excitation rectifying device is connected with described controlled winding.
Described outer excitation system comprises the outer exciting rectifier transformer be connected with station power supply, the outer excitation rectifier device be connected with described outer exciting rectifier transformer, the excitation system control section that is connected with described outer excitation rectifier device; Described outer excitation rectifier device is connected with described controlled winding.
The AC power of described outer excitation system electricity consumption source of going to the station to meet somebody from outward obtains, for described controlled winding provides control electric current.Described outer excitation system uses when described magnet controlled controllable parallel reactors first time drops into or drops into after fault, little to external power supply capacity demand; When described magnet controlled controllable parallel reactors stable operation or capacity reach requirement, be just switched to described self-excitation system.
Described controlled winding is obtained DC power supply by the DC side connecting described outer excitation system and is changed the magnetic saturation of magnet controlled controllable parallel reactors iron core by the direct current in adjustment direct current power source voltage and described controlled winding, the level and smooth capacity changing reactor and export.
Described magnet controlled controllable parallel reactors adopts self-excitation mode when normal operation, outer excitation mode is switched to when line fault or magnet controlled controllable parallel reactors first time drop into, stability and reliability high, technology trends is good, be adapted at transformer station and switchyard application, in China, ultra-high/extra-high voltage transmission system has a good application prospect.
When reactive voltage smoothly controls to suppress power-frequency overvoltage etc. to need magnet controlled controllable parallel reactors to play a role with transient process, controllable parallel reactors body is all charged, its compensative winding is also charged, self-excitation system effectively can overcome compensative winding voltage fluctuation problem by the Trigger Angle controlling rectifier, and the level and smooth control and the power-frequency overvoltage that realize output capacity suppress.Outer excitation system is pre-excitation stage input before magnet controlled controllable parallel reactors connecting system only, the self-excitation system that compensative winding connects just is switched to when magnet controlled controllable parallel reactors reaches volume output requirement, be in hot stand-by duty simultaneously, when self-excitation system jam, control system will switch to outer excitation system, ensure magnet controlled controllable parallel reactors winning not by the self-excitation system failure, ensure reliability of operation.
Described outer excitation system completes pre-excitation task, after magnet controlled controllable parallel reactors normally runs, outer excitation system is just switched to the two groups of self-excitation systems taking from controllable parallel reactors body compensative winding, outer excitation system is out of service, self-excitation system starts to bear the task of providing exciting current to controlled winding, master one is standby for self-excited system one, and on-line redundance realizes handover operation by triggering or locking pulse.Adopt the magnet controlled controllable parallel reactors of self-excitation mode obviously to improve stability and the reliability of the work of magnet controlled controllable parallel reactors excitation system, technology trends is good, has good Practical prospect.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of this right.
Claims (8)
1. a magnet controlled controllable parallel reactors, the Control protection system comprising magnet controlled controllable parallel reactors body, excitation system and be connected with described excitation system, it is characterized in that: described body is three winding structure, comprise high-pressure side winding, controlled winding and compensative winding; Described excitation system comprises the self-excitation system that AC is connected with described compensative winding respectively and the outer excitation system be connected with station power supply.
2. a kind of magnet controlled controllable parallel reactors as claimed in claim 1, is characterized in that: described self-excitation system can configure two cover self-excitation systems, realizes quick switching by triggering or locking pulse; When the self-excitation system failure described in one of them, switch another described self-excitation system for subsequent use immediately; Described self-excitation system obtains AC power by the compensative winding of described body.
3. a kind of magnet controlled controllable parallel reactors as claimed in claim 1 or 2, is characterized in that: the excitation system control section that described self-excitation system comprises the self-excitation rectifier transformer be connected with described compensative winding, the self-excitation rectifying device be connected with described rectifier transformer and is connected with described self-excitation rectifying device; Described self-excitation rectifying device DC output side is connected with described controlled winding.
4. a kind of magnet controlled controllable parallel reactors as claimed in claim 1, is characterized in that: described outer excitation system comprises the outer exciting rectifier transformer be connected with station power supply, the outer excitation rectifier device be connected with described outer exciting rectifier transformer, the excitation system control section that is connected with described outer excitation rectifier device; Described outer excitation rectifier device DC output side is connected with described controlled winding; The AC power slave station power supply of described outer excitation system obtains, for described controlled winding provides control electric current.
5. a kind of magnet controlled controllable parallel reactors as claimed in claim 4, is characterized in that: described high pressure winding is directly connected with the electric power system of application, described high pressure winding electric pressure is the highest.
6. a kind of magnet controlled controllable parallel reactors as claimed in claim 1, is characterized in that: described compensative winding is the tertiary winding that triangle connects, and it connects filter or Shunt Capacitor Unit; Described compensative winding provides the reactive power of perception for excitation system, expands the capacity regulating scope of magnet controlled controllable parallel reactors; The path of harmonic current is provided, reduces the harmonic component of injected system in magnet controlled controllable parallel reactors work, reduce controllable parallel reactors to the harmonic pollution of system, improve the quality of power supply of system.
7. the magnet controlled controllable parallel reactors of one as described in claim 1,4 and 5 any one, is characterized in that: described outer excitation system uses when described magnet controlled controllable parallel reactors first time drops into or drops into after fault; When described magnet controlled controllable parallel reactors stable operation or capacity reach requirement, be just switched to described self-excitation system.
8. a kind of magnet controlled controllable parallel reactors as claimed in claim 1; it is characterized in that: described Control protection system carries out analytical calculation according to the testing result of voltage or electric current; obtain the control section that result of calculation goes to regulate excitation system; change the trigger angle of rectifier; regulate the output capacity of controllable parallel reactors, thus systems stabilisation voltage and reactive power compensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310672145.1A CN104716652A (en) | 2013-12-12 | 2013-12-12 | Magnetically controlled shunt reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310672145.1A CN104716652A (en) | 2013-12-12 | 2013-12-12 | Magnetically controlled shunt reactor |
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| CN104716652A true CN104716652A (en) | 2015-06-17 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA028401B1 (en) * | 2015-11-03 | 2017-11-30 | Хайченко, Ирина Валентиновна | Shunt reactor controlled by biasing (variants) |
| CN108233802A (en) * | 2016-12-15 | 2018-06-29 | 中电普瑞科技有限公司 | A kind of magnet controlled controllable parallel reactors |
| CN110364344A (en) * | 2019-07-10 | 2019-10-22 | 兰州交通大学 | A kind of twin-stage switching rapid response type self-excitation type magnet controlled reactor and control method |
| CN110556835A (en) * | 2019-09-09 | 2019-12-10 | 南京南瑞继保工程技术有限公司 | layered control device and method for magnetic control type controllable shunt reactor |
| CN112467755A (en) * | 2019-09-09 | 2021-03-09 | 南京南瑞继保工程技术有限公司 | Online tracking and switching method and device for excitation system of magnetic control type controllable shunt reactor |
-
2013
- 2013-12-12 CN CN201310672145.1A patent/CN104716652A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA028401B1 (en) * | 2015-11-03 | 2017-11-30 | Хайченко, Ирина Валентиновна | Shunt reactor controlled by biasing (variants) |
| CN108233802A (en) * | 2016-12-15 | 2018-06-29 | 中电普瑞科技有限公司 | A kind of magnet controlled controllable parallel reactors |
| CN110364344A (en) * | 2019-07-10 | 2019-10-22 | 兰州交通大学 | A kind of twin-stage switching rapid response type self-excitation type magnet controlled reactor and control method |
| CN110556835A (en) * | 2019-09-09 | 2019-12-10 | 南京南瑞继保工程技术有限公司 | layered control device and method for magnetic control type controllable shunt reactor |
| CN112467755A (en) * | 2019-09-09 | 2021-03-09 | 南京南瑞继保工程技术有限公司 | Online tracking and switching method and device for excitation system of magnetic control type controllable shunt reactor |
| CN110556835B (en) * | 2019-09-09 | 2021-05-28 | 南京南瑞继保工程技术有限公司 | Layered control device and method for magnetic control type controllable shunt reactor |
| CN112467755B (en) * | 2019-09-09 | 2022-09-23 | 南京南瑞继保工程技术有限公司 | Online tracking and switching method and device for excitation system of magnetic control type controllable shunt reactor |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Applicant after: China Electric Prime Technology Co., Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: State Grid Smart Grid Institute Applicant before: China Electric Prime Technology Co., Ltd. |
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Inventor after: Lei Xi Inventor after: Zheng Junjie Inventor after: Jiang Dapeng Inventor after: Duan Quanxin Inventor after: Shi Zejing Inventor after: Liu Yang Inventor after: Xu Guizhi Inventor after: Zhang Zhenhuan Inventor after: Jia Genmao Inventor after: Yang Tong Inventor after: Cui Dawei Inventor after: Qiu Yufeng Inventor after: Wang Yuhong Inventor before: Lei Xi Inventor before: Duan Quanxin Inventor before: Shi Zejing Inventor before: Liu Yang Inventor before: Xu Guizhi Inventor before: Zhang Zhenhuan Inventor before: Jia Genmao Inventor before: Yang Tong Inventor before: Cui Dawei Inventor before: Zheng Junjie Inventor before: Jiang Dapeng |
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Application publication date: 20150617 |