CN102157947A - Application of capacitor integrated online monitoring technology in high-voltage reactive power compensation device - Google Patents
Application of capacitor integrated online monitoring technology in high-voltage reactive power compensation device Download PDFInfo
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- CN102157947A CN102157947A CN2011100820223A CN201110082022A CN102157947A CN 102157947 A CN102157947 A CN 102157947A CN 2011100820223 A CN2011100820223 A CN 2011100820223A CN 201110082022 A CN201110082022 A CN 201110082022A CN 102157947 A CN102157947 A CN 102157947A
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Abstract
The invention relates to the field of high-voltage reactive power compensation devices, in particular to the application of a capacitor integrated online monitoring technology in a high-voltage reactive power compensation device. In the application, a capacitor online monitoring loop, a full-film high-voltage parallel capacitor, a fuse, a permanent magnet mechanism vacuum contactor, a high-voltage reactive power integrated compensation controller and a fault protection loop are involved. A knee-protective and shoulder-protective healthcare massager has the advantages that: the problem that the capacitor integrated online monitoring technology is applied to an intelligent maintenance-free distributed high-voltage reactive power compensation device is focused to be solved; and the outstanding problems that equipment is easy to damage, not easy to use, difficult to maintain and the like in practical application are solved.
Description
Technical field
The present invention relates to the high-pressure reactive compensation device field, refer more particularly to the application of the comprehensive on-line monitoring technique of a kind of capacitor in high-pressure reactive compensation device.
Background technology
10 kilovolts of system's reactive-load compensation equipments of high pressure generally are installed in and adopt the centralized compensation regulative mode in the transformer station, but the dispersion of high pressure 10 kilovolt layouts has characteristics such as feeder line is long, power factor is low, line loss is big, quality of power supply difference; Along with the continuous development of emerging technology, high efficiency nonlinear load product is able to widespread usage, but non-linear, the impact of user load, the unbalanced electrical characteristics of use, causes the network system instantaneous reactive to be in all the time highly in the frequent variations process.
It is a kind of good compensation way that high-voltage parallel capacitor is installed on distribution line, particularly to reducing line loss, improve reactive power compensation efficient, improving quality of voltage the effect of getting instant result is arranged.Be need to solve the frequent movement ability of fling-cut switch and the monitoring reliability of electric capacity, distributed high-pressure reactive compensation equipment is fragile, ease for use is poor, safeguard that a series of problems such as difficulty are difficult to solve always.
1, state of development
Along with the high speed development of modern chemical industry, civilian electricity, electric energy has become one of most important energy of the present mankind; The widespread usage of nonlinear-load, a large amount of harmonic waves inject electrical networks, and non-linear, the impact of user load, the unbalanced electrical characteristics of using cause the network system quality of power supply constantly to worsen.
China worker, people's electric equipment technology improve constantly and accordingly some high-tech offshore companies in China, make an investment in a factory, the quality problems of electric energy have had influence on the development of normal industrial technology; Some high-end fine finishining industrial fields, need safe, stable, reliable and high-quality " meticulous " power supply, " slightly " power supply that the original Open Management of China causes can not satisfy the application and the development of existing industrial enterprise and people's daily life.
China has carried out a large amount of research and practice from the eighties in this field of distributed (pole) high-pressure reactive compensation, obtained many experiences and good economic benefits.But because the problem of aspects such as the technology of electric equipments such as fling-cut switch, automatic controller, cost has blocked applying of pole device.Still rest on the level of simple type, non-automatic switching mostly.
2, the problem of distributed high-pressure reactive compensation technology applicable cases and technological deficiency and existence
A) automatic control technology imperfection:
At present mostly the control device structure as shown in Figure 1, the general main DSP/ single-chip microcomputer with 16 of internal processor is the key data processor, generally all is simply according to parameters such as voltage, power factor and time control switched capacitor; Install general most outdoor depopulated zone that all is operated in, situations such as overvoltage, overcurrent and excess temperature appear in this condition of work easily, overvoltage, overcurrent and excess temperature directly have influence on the useful life of parallel capacitor, because lacking intelligent multielement control technology, uses by compensating controller, further dwindle the useful life of capacitor, also increased the working service amount and the practical application difficulty of this equipment simultaneously;
Based on the weak point of existing high-pressure reactive compensation device, the inventor has developed the present invention's a kind of " application of the comprehensive on-line monitoring technique of capacitor in high-pressure reactive compensation device ".
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art technical problem to be solved is: the application of the comprehensive on-line monitoring technique of a kind of capacitor in high-pressure reactive compensation device is provided.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention is by capacitor on-line monitoring loop, full film high-voltage parallel capacitor, fuse, and permanent magnetic actuator vacuum contactor, high pressure Reactive-current General Compensation controller and error protection loop etc. are partly formed.Product is by well-designed, emphasis solves will " high-voltage capacitor on-line monitoring technique " to be applied to have in intellectuality and the non-maintaining distributed high-pressure reactive compensation device, solve that this equipment occurs in actual applications fragile, ease for use is poor, safeguard outstanding problem such as difficulty.
1, the design that has the non-maintaining type high-pressure reactive compensation device of " the online function of capacitor "
Non-maintaining type high-pressure reactive compensation device with " the online function of capacitor " adopts dual processor to form, wherein finish reactive power compensation algorithm and controlled function for one, an other processor is finished the on-line monitoring function to the capacitor operational factor, and the inner CAN of employing of dual processor bus realizes data exchanging function;
A) realization of reactive power compensation algorithm and controlled function:
So the high pressure imaginary power automatic compensation working principle of design of this product can cover algorithm process and the controlled function that other reactive power automatic compensation devices have except the new design of self; Idle switching mode can use one of six kinds of control modes of setting, i.e. time, voltage, time voltage, power factor and reactive power and harmonic current, the wherein switching of the automatic control capacitor of any mode; One of five kinds of control modes such as other reactive power automatic compensation device design employing time, voltage, time voltage, power factor and reactive power; The practice operation empirical evidence, along with the electrical network power consumption equipment constantly develops to technicalization, modernization, complicated and high request direction, the secondary pollution discharging " harmonic wave " that the power consumption equipment of high efficiency and high-technicalization produces is on the rise and complexity to the increase that influences whatever you like of system equipment, quite serious with time-harmonic wave to the influence of the security of operation of reactive-load compensation capacitor and actual effect, mainly be to cause the operation of capacitor super-load and excess temperature, finally cause the phenomenons such as aging, puncture of capacitor;
At the influence of system harmonics to capacitor, this device has increased " the out-of-limit optimization operation of harmonic wave " programming in design, 1. directly out of service in the out-of-limit big value of harmonic wave zone, 2. customization moves and the off-line time interval in the out-of-limit warning region of harmonic wave, reach the useful life and the anti-harmonic effects ability that improve raising equipment, the stability of enhanced system;
B) realization of compensating controller defencive function:
Product design integrated comprehensive electricity consumption monitoring function, overcurrent of capacitor function, electric energy quality monitoring function and capacitor on-line monitoring function etc., the overcurrent of capacitor function comprises the excess current protective function and the three-phase capacitor degree of unbalance current protecting function of capacitor three phase capacitance electric current; The electric energy quality monitoring function comprises realization voltage quality monitoring, electrical network/user-side harmonic monitoring and the out-of-limit defencive function of harmonic wave, condenser capacity falling alarm function, capacitor operating temperature overtemperature alarm defencive function etc.;
C) realization of capacitor on-line monitoring function:
Novel maintenance-free high-pressure reactive compensation device integrated capacitor on-line monitoring function, on-line monitoring function comprise the monitoring etc. of on-line monitoring, partial discharge of capacitor on-line monitoring and condenser loss angle of on-line monitoring, the condenser capacity of capacitor operating temperature; Non-maintaining, long-life, intelligentized high-pressure reactive compensation control device are the maximum characteristics of this product;
2, the design of distributed intelligence high-pressure reactive compensation the complete sets of equipment
Distributed intelligence high-pressure reactive compensation the complete sets of equipment are by full film high-voltage parallel capacitor (belt discharge resistance and interior fuse), fuse switch; permanent magnetic actuator vacuum contactor, voltage transformer; zinc oxide arrester, current transformer, compositions such as capacitor on-line monitoring loop, high pressure Reactive-current General Compensation controller, protection loop.
A) fling-cut switch design reliably:
The vacuum contactor that new non-maintaining high-pressure reactive compensation device reactive compensation switching switch adopts permanent magnet mechanism to drive, permanent magnet mechanism can be realized the control of phase-splitting zero current, reach the flexible soft switching manipulation to capacitor, it is strong to have breaking capacity, and the life-span is long, and maintenance capacity is little, electric arc does not expose, safe and reliable, volume is little, and is in light weight, noise is low, power saving, energy-conservation, can be in the distinguishing feature of abominable occasion use;
B) capacitor line monitor signal sampling design:
Novel maintenance-free high-pressure reactive compensation device integrated capacitor on-line monitoring function, on-line monitoring comprises signal sampling and data processing, shown in legend-8, system design is at " shunt capacitor " mounted on surface " operating temperature transducer ", the temperature data of sampling capacitor actual motion, capacitor often occurs in real work because the capacitor entity temperature that aging, puncture and overload cause raises, and the variation of operation capacitor actual temperature also is one of key data of reactive-load compensation capacitor running status;
" leakage office discharge stream transducer " is installed at capacitor surface, realization is to the monitoring and the diagnosis of capacitor leakage, it is one of important parameter of capacitor operation that the drainage of electric capacity general ability is leaked, capacitor aging, slowly puncture and overload etc. can both embody by this monitoring, to the monitoring that the drainage of electric capacity general ability is leaked, treatment system can calculate the office's value of putting of capacitor and the monitoring of condenser loss angle etc.; The leakage aging and birthday noodle and capacitor of capacitor is proportional;
A) condenser capacity monitoring design:
Monitoring is by the load current to capacitor to capacitor volume in system, compare with the reference voltage/current value of internal system, the variation of monitoring capacitor capacity and rated value relatively provide the variation tendency of capacitor working capacity, make giving warning in advance and diagnosing;
B) the flexible lightweight design of system's the complete sets of equipment blocking
The integrated design of minimum zone is adopted in new non-maintaining high-pressure reactive compensation device design, as this cover reactive-load compensation equipment comprise Based Intelligent Control monitoring case, by vacuum contactor, voltage transformer, the switching device that zinc oxide arrester, current transformer etc. are formed, Shunt Capacitor Unit (belt discharge resistance and interior fuse), fuse switch etc. are partly formed, help that each electric equipment is carried out cordwood system type and install, reach compact, simple, light weight, easy target such as installation.
The present invention is by well-designed, main purpose realizes non-maintaining, the long-life of the distributed high-pressure reactive compensation equipment of distribution end, solution equipment in actual applications fragile, ease for use is poor, safeguard outstanding problems such as difficulty, the distributed high-pressure reactive compensation product of High Reliability Intellectualization can be put in city, the rural power grids technological transformation market fast, reduce line loss to reach, improve reactive power compensation efficient, improve effect such as user's quality of power supply.
A) reactive power compensation control flexibly: the operation principle of distributed High Voltage and Passive Automatic Compensation Device and other reactive power automatic compensation devices are the same substantially aspect the reactive power compensation Control work principle, after fuse switch is closed in the pass, the device high voltage source is switched on, high pressure P T device provides AC power to high-pressure reactive compensation automatic control equipment and high-pressure vacuum contactor, device is by gathering the voltage and the load current signal of 6kV or 10kV circuit, one of six kinds of control modes that utilization is set, it is the time, voltage, time voltage, power factor and reactive power and harmonic current, the wherein switching of the automatic control capacitor of any mode; Reach and improve power factor, reduce line loss, improve the purpose of quality of voltage, prevent the idle function of sending simultaneously;
B) the comprehensively monitoring ability is powerful: new non-maintaining high-pressure reactive compensation device adopts 32 bit DSP processors, 32 high-end bit DSP processor data processing capacities are powerful, device is except realizing the auto-reactive compensation function, product design is also integrated uses electrical measurement monitoring function, overcurrent of capacitor function, electric energy quality monitoring function and capacitor on-line monitoring function etc., comprises user's electricity consumption data monitoring and functions such as data message statistics and telecommunication processing with the electrical measurement monitoring function; The overcurrent of capacitor function comprises the excess current protective function and the three-phase capacitor degree of unbalance current protecting function of capacitor three phase capacitance electric current; The electric energy quality monitoring function comprises realization voltage quality monitoring, electrical network/user-side harmonic monitoring, rate of qualified voltage monitoring function etc.;
C) application of capacitor on-line monitoring technique, the non-maintaining function of realization distributed reactive power compensation device: new non-maintaining high-pressure reactive compensation device not only has the reactive power compensation controlled function of automatic multi-function protection, and product is integrated capacitor on-line monitoring function also.Capacitor on-line monitoring function comprises the monitoring etc. of on-line monitoring, partial discharge of capacitor on-line monitoring and condenser loss angle of on-line monitoring, the condenser capacity of capacitor operating temperature; The real non-maintaining function that realizes high pressure auto-reactive compensation equipment; Realize non-maintaining, long-life of equipment operation, intelligentized distributed high-pressure reactive compensation device product;
D) adopt the vacuum contactor of permanent magnet mechanism control principle as fling-cut switch, realization is to the flexible soft switch control of capacitor, improve reliability of products: the vacuum contactor that new non-maintaining high-pressure reactive compensation device reactive compensation switching switch adopts permanent magnet mechanism to drive, permanent magnet mechanism is realized the control of phase-splitting zero current, realization is to the flexible soft switching manipulation of capacitor, it is strong to have breaking capacity, and the life-span is long, and maintenance capacity is little, electric arc does not expose, safe and reliable, volume is little, and is in light weight, noise is low, power saving, energy-conservation, can be in the distinguishing feature of abominable occasion use;
E) the on-line monitoring function of multiple protective control, the non-maintaining property and the reliability of equipment are improved greatly: new non-maintaining high-pressure reactive compensation device is implemented the on-line monitoring and diagnosis function to capacitor, mainly operating temperature, capacitance, capacitance current degree of unbalance, the office of capacitor are put and dielectric loss etc. realized on-line monitoring, guarantee the capacitor stable and reliable operation, improve the non-maintaining ability of reactive-load compensation complete equipment; Device is except that to the capacitor on-line monitoring and diagnosis defencive function, comprise the voltage defencive function (as under voltage prohibit insure protect, overvoltage prohibit insure protect and phase shortage prohibit to insure protect etc.), electric current defencive function (as electric capacity overcurrent protection, the protection of capacitance current degree of unbalance etc.), unusual tripping defencive function, telemechanical automatically/distant control function etc.;
F) field conduct is installed simple and direct light, the integrated design of minimum zone is adopted in new non-maintaining high-pressure reactive compensation device design, as this cover reactive-load compensation equipment comprise Based Intelligent Control monitoring case, by vacuum contactor, voltage transformer, the switching device that zinc oxide arrester, current transformer etc. are formed, Shunt Capacitor Unit (belt discharge resistance and interior fuse), fuse switch etc. are partly formed, help that each electric equipment is carried out cordwood system type and install, reach compact, simple, light weight, easy target such as installation.
The beneficial effect of the application of the comprehensive on-line monitoring technique of a kind of capacitor of the present invention in high-pressure reactive compensation device is:
Emphasis solves will " high-voltage capacitor on-line monitoring technique " to be applied to have in intellectuality and the non-maintaining distributed high-pressure reactive compensation device, solve that this equipment occurs in actual applications fragile, ease for use is poor, safeguard outstanding problem such as difficulty.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is " distributed (or pole) reactive power compensation control device " system construction drawing at present commonly used;
Fig. 2 is the overall structure hardware schematic diagram of distributed non-maintaining high-pressure reactive compensation control device;
Fig. 3 is the overall structure schematic diagram of distributed intelligence high-pressure reactive compensation the complete sets of equipment.
Embodiment
The present invention implements like this:
In Fig. 2 and Fig. 3; the application of the comprehensive on-line monitoring technique of a kind of capacitor in high-pressure reactive compensation device; it is by capacitor on-line monitoring loop, full film high-voltage parallel capacitor, fuse, and permanent magnetic actuator vacuum contactor, high pressure Reactive-current General Compensation controller and error protection loop are formed.By well-designed, emphasis solves will " high-voltage capacitor on-line monitoring technique " to be applied to have in intellectuality and the non-maintaining distributed high-pressure reactive compensation device, solve that this equipment occurs in actual applications fragile, ease for use is poor, safeguard outstanding problem such as difficulty.
1, the design that has the non-maintaining type high-pressure reactive compensation device of " the online function of capacitor "
Non-maintaining type high-pressure reactive compensation device with " the online function of capacitor " adopts dual processor to form, wherein finish reactive power compensation algorithm and controlled function for one, an other processor is finished the on-line monitoring function to the capacitor operational factor, and the inner CAN of employing of dual processor bus realizes data exchanging function;
A) realization of reactive power compensation algorithm and controlled function:
So the high pressure imaginary power automatic compensation working principle of design of this product can cover algorithm process and the controlled function that other reactive power automatic compensation devices have except the new design of self; Idle switching mode can use one of six kinds of control modes of setting, i.e. time, voltage, time voltage, power factor and reactive power and harmonic current, the wherein switching of the automatic control capacitor of any mode; One of five kinds of control modes such as other reactive power automatic compensation device design employing time, voltage, time voltage, power factor and reactive power; The practice operation empirical evidence, along with the electrical network power consumption equipment constantly develops to technicalization, modernization, complicated and high request direction, the secondary pollution discharging " harmonic wave " that the power consumption equipment of high efficiency and high-technicalization produces is on the rise and complexity to the increase that influences whatever you like of system equipment, quite serious with time-harmonic wave to the influence of the security of operation of reactive-load compensation capacitor and actual effect, mainly be to cause the operation of capacitor super-load and excess temperature, finally cause the phenomenons such as aging, puncture of capacitor;
At the influence of system harmonics to capacitor, this device has increased " the out-of-limit optimization operation of harmonic wave " programming in design, 1. directly out of service in the out-of-limit big value of harmonic wave zone, 2. customization moves and the off-line time interval in the out-of-limit warning region of harmonic wave, reach the useful life and the anti-harmonic effects ability that improve raising equipment, the stability of enhanced system;
B) realization of compensating controller defencive function:
Product design integrated comprehensive electricity consumption monitoring function, overcurrent of capacitor function, electric energy quality monitoring function and capacitor on-line monitoring function etc., the overcurrent of capacitor function comprises the excess current protective function and the three-phase capacitor degree of unbalance current protecting function of capacitor three phase capacitance electric current; The electric energy quality monitoring function comprises realization voltage quality monitoring, electrical network/user-side harmonic monitoring and the out-of-limit defencive function of harmonic wave, condenser capacity falling alarm function, capacitor operating temperature overtemperature alarm defencive function etc.;
C) realization of capacitor on-line monitoring function:
Novel maintenance-free high-pressure reactive compensation device integrated capacitor on-line monitoring function, on-line monitoring function comprise the monitoring etc. of on-line monitoring, partial discharge of capacitor on-line monitoring and condenser loss angle of on-line monitoring, the condenser capacity of capacitor operating temperature; Non-maintaining, long-life, intelligentized high-pressure reactive compensation control device are the maximum characteristics of this product;
2, the design of distributed intelligence high-pressure reactive compensation the complete sets of equipment
Distributed intelligence high-pressure reactive compensation the complete sets of equipment are by full film high-voltage parallel capacitor (belt discharge resistance and interior fuse), fuse switch; permanent magnetic actuator vacuum contactor, voltage transformer; zinc oxide arrester, current transformer, compositions such as capacitor on-line monitoring loop, high pressure Reactive-current General Compensation controller, protection loop.
A) fling-cut switch design reliably:
The vacuum contactor that new non-maintaining high-pressure reactive compensation device reactive compensation switching switch adopts permanent magnet mechanism to drive, permanent magnet mechanism can be realized the control of phase-splitting zero current, reach the flexible soft switching manipulation to capacitor, it is strong to have breaking capacity, and the life-span is long, and maintenance capacity is little, electric arc does not expose, safe and reliable, volume is little, and is in light weight, noise is low, power saving, energy-conservation, can be in the distinguishing feature of abominable occasion use;
B) capacitor line monitor signal sampling design:
Novel maintenance-free high-pressure reactive compensation device integrated capacitor on-line monitoring function, on-line monitoring comprises signal sampling and data processing, shown in legend-8, system design is at " shunt capacitor " mounted on surface " operating temperature transducer ", the temperature data of sampling capacitor actual motion, capacitor often occurs in real work because the capacitor entity temperature that aging, puncture and overload cause raises, and the variation of operation capacitor actual temperature also is one of key data of reactive-load compensation capacitor running status;
" leakage office discharge stream transducer " is installed at capacitor surface, realization is to the monitoring and the diagnosis of capacitor leakage, it is one of important parameter of capacitor operation that the drainage of electric capacity general ability is leaked, capacitor aging, slowly puncture and overload etc. can both embody by this monitoring, to the monitoring that the drainage of electric capacity general ability is leaked, treatment system can calculate the office's value of putting of capacitor and the monitoring of condenser loss angle etc.; The leakage aging and birthday noodle and capacitor of capacitor is proportional;
C) condenser capacity monitoring design:
Monitoring is by the load current to capacitor to capacitor volume in system, compare with the reference voltage/current value of internal system, the variation of monitoring capacitor capacity and rated value relatively provide the variation tendency of capacitor working capacity, make giving warning in advance and diagnosing;
D) the flexible lightweight design of system's the complete sets of equipment blocking
The integrated design of minimum zone is adopted in new non-maintaining high-pressure reactive compensation device design, as this cover reactive-load compensation equipment comprise Based Intelligent Control monitoring case, by vacuum contactor, voltage transformer, the switching device that zinc oxide arrester, current transformer etc. are formed, Shunt Capacitor Unit (belt discharge resistance and interior fuse), fuse switch etc. are partly formed, help that each electric equipment is carried out cordwood system type and install, reach compact, simple, light weight, easy target such as installation.
The above, it only is the preferred embodiment of the application of the comprehensive on-line monitoring technique of a kind of capacitor of the present invention in high-pressure reactive compensation device, be not that technical scope of the present invention is imposed any restrictions, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention above any trickle modification, equivalent variations and modification that embodiment did.
Claims (1)
1. the application of the comprehensive on-line monitoring technique of capacitor in high-pressure reactive compensation device; it is characterized in that: it is by capacitor on-line monitoring loop, full film high-voltage parallel capacitor, fuse, and permanent magnetic actuator vacuum contactor, high pressure Reactive-current General Compensation controller and error protection loop are formed.
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| CN103023052A (en) * | 2012-12-27 | 2013-04-03 | 广西腾峰科技有限公司 | Intelligent quick dynamic hybrid reactive compensation system |
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| CN103595059A (en) * | 2013-10-24 | 2014-02-19 | 国家电网公司 | Reactive compensation device of 10kV line |
| CN105699810A (en) * | 2016-02-29 | 2016-06-22 | 珠海格力电器股份有限公司 | Electrolytic capacitor on-line test device and method |
| CN108132422A (en) * | 2017-12-13 | 2018-06-08 | 哈尔滨理工大学 | A kind of monitoring system and method for capacitive reactive power compensation device failure |
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| CN110352357A (en) * | 2017-03-01 | 2019-10-18 | Abb瑞士股份有限公司 | Method and apparatus for determining capacitive element parameter |
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| CN103023052A (en) * | 2012-12-27 | 2013-04-03 | 广西腾峰科技有限公司 | Intelligent quick dynamic hybrid reactive compensation system |
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| CN103235197B (en) * | 2013-05-07 | 2016-07-06 | 国家电网公司 | The method and system of reactive power compensator degree of unbalancedness test |
| CN103595059A (en) * | 2013-10-24 | 2014-02-19 | 国家电网公司 | Reactive compensation device of 10kV line |
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| CN110352357A (en) * | 2017-03-01 | 2019-10-18 | Abb瑞士股份有限公司 | Method and apparatus for determining capacitive element parameter |
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| CN108132422A (en) * | 2017-12-13 | 2018-06-08 | 哈尔滨理工大学 | A kind of monitoring system and method for capacitive reactive power compensation device failure |
| CN109061353A (en) * | 2018-09-05 | 2018-12-21 | 山西太钢不锈钢股份有限公司 | A kind of electric furnace reactive-load compensation capacitor fault detection method |
| CN110445017A (en) * | 2019-08-09 | 2019-11-12 | 深圳市奇辉电气有限公司 | Integral type AC power source input module |
| CN110445017B (en) * | 2019-08-09 | 2023-08-01 | 深圳金奇辉电气有限公司 | Integrated AC power input module |
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Application publication date: 20110817 |