CN1416197A - System for on-line monitoring quality of electricity and monitoring method - Google Patents
System for on-line monitoring quality of electricity and monitoring method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- 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
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The online monitoring system includes the devices of online monitoring the quality of power supply and at least one server. The devices are allocated at the electrical power system and several consumer distribution networks in order to real time collecting, analytical processing, displaying and transferring the quality of power supply of the power network monitored. The server through the telephone line (or optical fiber) and several said devices constitutes the monitoring network in order to analytical process the parameters of the quality of power supply sent by the devices and provide the analyzed result for user browsing. The advanced technique such as double digital signal processing chips (DSP), the double ports RAM, the local FLASH with large capacitance etc. are adopted in the device.
Description
Technical field
The present invention relates to the electric energy quality monitoring technology, especially for the quality of power supply online monitoring system and the method for supervising thereof of electric power system and power consumer power distribution network.
Background technology
Existing electric energy quality monitoring product major part is portable instrument (device), or employing analog circuit mode, or employing industrial computer mode, the consideration of gathering simultaneously at the real-time online three-phase, doing aspect the analyzing and processing seldom, functional reliability is undesirable, device can not long-time running, also can't with the teletransmission of collection analysis parameter afield control centre carry out further analyzing and processing, can not form a complete electric energy quality monitoring information network.
In addition, existing apparatus does not all adopt OO control mode (i.e. monitoring one to one), the problem that adopts multi-path monitoring to occur is the monitoring that any one tunnel fault all might have influence on other loop, the fault of any one element all will threaten the safe operation of whole table apparatus, can not adapt to the high reliability stability requirement of electric power system requirement, also be difficult to adapt to the requirement that accident is narrowed down to minimum zone.
Summary of the invention
In view of existing electric energy quality monitoring technology above shortcomings, the present invention proposes a kind of quality of power supply online monitoring system and method for supervising thereof, system monitors, shows relevant power quality parameter on the spot by some OO independent on-line monitoring devices, form real-time online quality of power supply message control network by telephone wire (or optical fiber) and master server simultaneously, give the master server analyzing and processing with all monitored power quality parameter real-time Transmission, and can provide other multi-user to browse analysis.
Quality of power supply online monitoring system of the present invention is characterized in that comprising:
Some quality of power supply on-line monitoring devices, they are disposed at electric power system and some user's power distribution networks, the power quality parameter that is used for real-time collection, analyzing and processing, demonstration and transmits monitored electrical network respectively;
At least one server, by telephone wire or optical fiber and described some quality of power supply on-line monitoring device composition monitoring networks, be used for the power quality parameter that real-time reception, all quality of power supply on-line monitoring devices of analyzing and processing are sent here, and can offer other multi-user and browse analysis.
Quality of power supply on-line monitoring method of the present invention, the supervisory control system based on being made up of server and the some quality of power supply on-line monitoring devices that are disposed at electrical network is characterized in that taking following steps:
A, each quality of power supply on-line monitoring device are gathered the power quality parameter of monitored electrical network in real time, and analyzing and processing, storage show;
B, described quality of power supply on-line monitoring device transmit power quality parameter to server in real time by telephone wire or optical networking;
The power quality parameter that c, server receive in real time, all quality of power supply on-line monitoring devices of analyzing and processing are sent here, and can provide other multi-user to browse analysis.
The present invention monitors, shows relevant power quality parameter on the spot by some OO on-line monitoring devices, form the real time and on line monitoring network by netting twine and master server simultaneously, give the master server analyzing and processing with monitored electrical energy parameter real-time Transmission, and can provide other multi-user to browse analysis, realized that the directviewing description and the real-time analysis of the mass parameter of this specialty goods of electric energy handled.The powerful backstage analysis software that utilizes this system to provide simultaneously, five national standards according to the quality of power supply, form the uniform data form in different time stage, form the dynamic time change curve of the quality of power supply parameters in different time stage, form the quality of power supply information network of a huge real-time online, satisfy the new demand of information age electric power development.
Its each quality of power supply on-line monitoring device, server all can show three-phase fundamental voltage, electric current, frequency departure in real time, three-phase 2～25 subharmonic voltages, electric current, power, negative sequence voltage, electric current, tri-phase unbalance factor, voltage deviation, power factor, power quality parameters such as voltage fluctuation flickering, power quality parameters such as display waveform, spectrum curve in real time.
Its quality of power supply on-line monitoring device adopts even numbers word signal processing chip (DSP), two-port RAM, advanced technology such as high-capacity FLASH, large-screen lc demonstration on the spot.In electric energy monitoring system, adopt digital signal processor (DSP) to finish the FFT computing first, and then the quality of power supply is carried out accurate, real-time analysis follow the tracks of.The technical conceive novelty, compact conformation, reliable, information processing rate, control precision improve greatly than prior art.
Description of drawings
Fig. 1 is a quality of power supply real time and on line monitoring system schematic of the present invention;
Fig. 2 is the theory diagram of its quality of power supply real time and on line monitoring device;
Fig. 3 is that the PQM-1 quality of power supply real time and on line monitoring device of Fig. 2 is implemented circuit diagram;
Fig. 4 is its on-line monitoring device data acquisition program flow chart;
Fig. 5 is its on-line monitoring device master control program flow chart.
Embodiment
System configuration of the present invention as shown in Figure 1, mainly supervising device (or unit) and at least one distant place master server (multi-user) are formed by telephone wire (or optical fiber) on the spot by some PQM-1 in this system.
Wherein PQM-1 on the spot monitoring unit (device) be primarily implemented in the locality and finish and comprise three-phase fundamental voltage, electric current, frequency departure, three-phase 2～25 subharmonic voltages, electric current, power, negative sequence voltage, electric current, frequency, tri-phase unbalance factor, voltage deviation, power factor, shows and memory function on the spot in real time the collection of power quality parameters such as voltage fluctuation flickering, real-time analysis.PQM-1 monitoring unit (device) on the spot also can realize showing three-phase voltage electric current real-time waveform, 2～25 subharmonic voltages, electric current, power spectrum curve etc. on the spot in real time, and finishes the distant place transmission of all real-time parameters, accepts the instruction of distant place issue.
Real-time reception, timing that master server is finished distant place data receive or manually get local storage data, automatically form uniform data form and quality of power supply dynamic changing curve for further five national standards, simultaneously real-time online ground showing real-time wave, each harmonic frequency spectrum figures according to the quality of power supply.
Theory diagram 2 and enforcement circuit as quality of power supply real time and on line monitoring device are shown in Figure 3, on-line monitoring device comprises: the three-phase current voltage sampling circuit, two digital signal processor (DSP1, DSP2), two-port RAM, the A/D converter, the I/O controller, program data memory, communication control unit, the FLASH memory, display and keyboard, the A/D converter is connected between sample circuit and the DSP1, two-port RAM is connected between DSP1 and the DSP2 by bus, program data memory, I/O controller and communication control unit all are connected with DSP2 by bus, the FLASH memory, display and keyboard all are connected in the corresponding port of I/O controller.
Three-phase voltage, current signal obtain from voltage transformer (PT) and the current transformer (CT) that is disposed at electric power system (or power consumer) transformer station.
Converter (2) is made up of signal converter and front end signal filter circuit, will be to be fit to the weak electric signal that subsequent conditioning circuit uses from the high-voltage large current conversion of signals of CT, PT, and the spike on the filtered signal line disturbs.
A/D converter (3) adopts high-precision 16 6 road A/D converters of sampling simultaneously, each analog signals is converted to digital quantity signal, and send it to DSP1, and 6 road selecting for use of characteristic of sampling have simultaneously guaranteed the real simultaneity of U, I signal, sampling rate can be up to 64K.
Digital signal processor DSP 1 (4) adopts the high performance DSP (DSP320F206) of latest digital signal processing technology, this technology is different from common science and calculates and analyze, DSP mainly emphasizes the real-time of calculation process, and the main distinction of DSP and MPU (general purpose microprocessor), MCU (microcontroller) is the real-time processing of DSP towards high-performance, repeatability, numerical operation intensity; MPU is widely used in computer, and MCU then is adapted to be controlled to be main processing procedure.
PQM system applies DSP realizes fft algorithm, thereby determines 2～25 subharmonic numerical value of signal frequency, three-phase voltage electric current, and the 4-10 that its speed is not only MPU doubly and can flowing water finishes the real-time input of data/go out without interruption.The DSP technology still belongs to the first time being applied in both at home and abroad of this field in conjunction with fft algorithm, mainly real time data is carried out the real-time conversion of FFT to form the subsequent conditioning circuit desired data.
Two-port RAM (5) is mainly finished data is moved DSP2 so that carry out further subsequent treatment at a high speed without interfering with each other from DSP1.Two-port RAM can be selected DUAL-PORT-SRAM (2K*16bit) circuit for use, the application of two-port RAM guaranteed data can be at a high speed, simultaneously, transmit without interfering with each other, real-time is good, and is convenient to realize.Comparatively speaking, do not adopt the circuit of two-port RAM not only complicated (needing to realize), and real-time is poor, the data passes conflict takes place easily, make mistakes with other elements combination.
DSP2 (6) carries out further data analysis with the data of DSP1 behind FFT and judges whether to exceed standard, and finishes large-screen lc demonstration on the spot, high-capacity FLASH storage on the spot, finishes the functions such as distant place transmission control of data simultaneously.The DSP2 chip also can adopt DSP320F206 circuit etc.
FLASH memory (7) is deposited the high-capacity FLASH locality of mainly finishing real time data on the spot.This The Application of Technology has been guaranteed the real practicality of this system configuration method, thereby needn't adopt huge industrial computer to realize depositing of data, significantly reduces the overall dimension of device simultaneously.
Liquid crystal display (8) large-screen lc on the spot shows, the locality of finishing above-mentioned various power quality index parameters and real-time waveform, frequency spectrum shows, is convenient to field assay and observes, and guaranteed that again this device can not networking and isolated operation.
(9) be optical fiber, telephone wire and Morden, be used to the real-time Transmission of data that passage is provided.Communication interface can be between RS485 and RS232 switches arbitrarily, and the telephone wire transmission rate is 38.4K, and fiber-optic transmission rate is 115.2K, both can be directly and the PC communication, also can carry out communication by the PC in optical fiber and a telephone wire and a distant place.Make full use of existing bandwidth, under the situation of minimising loss transmission speed, solved the generation of conflict effectively, make a Surveillance center can control 99 monitoring means (device) that are installed on same transformer station at most simultaneously
Remote monitoring central server (10) is used to finish the remote monitoring of real time data, and the demonstration of waveform, record forms the uniform data analytical statement, unified change curve form.
The core of supervising device (11), adopt the latest digital technology, the brand-new hardware configuration that forms two-port RAM+two DSP, cooperates high-capacity FLASH and large-screen lc on the spot to show, a DSP mainly finishes FFT, another DSP finishes further analyzing and processing, storage, demonstration, the teletransmission function of data, do not disturb mutually, efficient, in real time, simple, practical, convenient, made full use of the state-of-the-art technology of current digitized processing.
Describe the course of work of supervising device in detail below in conjunction with flow chart 4,5.
Sample circuit disturbs high voltage, big current signal through the spike that converter is converted on weak electric signal and the filtered signal line, be coupled to the A/D change-over circuit through the signal coupling circuit of forming by difference channel and filter circuit then, the main filtering high-frequency signal of coupling circuit, owing to adopted difference modes, improved the common-mode rejection ratio of coupling circuit effectively.
High Performance DSP 1 chip mainly receives the data of A/D conversion, and real-time signal calculated frequency, the utilization fft algorithm calculates the amplitude of 1～25 component of degree n n of three-phase voltage, current signal and phase place (ripple 128 points of sampling weekly, sample frequency 6400HZ), and the two-port RAM of this signal by 2K*16bit be transferred to second further analyzing and processing of DSP2, the employing of two-port RAM, guaranteed signal at a high speed, real-time, accurate, errorless transmission; DSP2 mainly finishes the further computational analysis of sampled data and (calculates each harmonic voltage, electric current containing ratio, the resultant distortion rate, the meritorious reactive power of each harmonic, total meritorious, reactive power, power factor, line voltage, voltage deviation, Voltage unbalance degree, negative sequence voltage electric current, voltage fluctuation flickering), be responsible for simultaneously data storage on the spot, comparison, communication, show in real time, system parameters function is set etc.
The 128Mbit high-capacity FLASH is mainly finished the storage on the spot of real time record, alert data; The soft touch key-press that utilizes unit panel to carry, can realize easily that the setting of system parameters (parameters such as warning limit value that comprise voltage PT parameter, electric current CT parameter, system short circuit capacity, various power quality parameters) adjusts, and this type of information parameter is stored among the small sector FLASH at a high speed.
The big capacity of panel configuration liquid crystal demonstration in real time on the spot comprises three-phase fundamental voltage, electric current, frequency departure, three-phase 2～25 subharmonic voltages, electric current, power, negative sequence voltage, electric current, frequency, tri-phase unbalance factor, voltage deviation, power factor, power quality parameters such as voltage fluctuation flickering show three-phase voltage electric current real-time waveform, 2～25 subharmonic voltages, electric current, power spectrum curve etc. simultaneously.The transmission of various control commands and real time data is finished in the Communication Control loop.
Control main program (Fig. 5) is mainly carried out following operation: initialization is provided with system parameters according to the system parameters order is set; According to the reading system parameter command, read the data among the DARAM after upgrading, the analyzing and processing alarm signal; Then move communication control module, handle relevant communication command with the I/O mouth; Jump to the monitoring interface of needs then according to current display interface, show relevant parameters; Handle relevant communication command at last, refresh LCD display and return, finish once circulation with the I/O mouth.The monitoring interface of present embodiment comprises: the demonstration of main interface real-time waveform, the demonstration of harmonic synthesis data, the demonstration of voltage harmonic frequency spectrum, the demonstration of current harmonics frequency spectrum, the demonstration of active power harmonic spectrum, the demonstration of reactive power harmonic spectrum, other power quality parameter demonstration etc.
The enforcement of electric energy quality monitoring system of the present invention and method for supervising, broken the notion of traditional electric energy quality monitoring, formed omnibearing quality of power supply message control network, realized that the directviewing description and the real-time analysis of the mass parameter of this specialty goods of electric energy handled.
Claims (5)
1, a kind of quality of power supply online monitoring system is characterized in that comprising:
Some quality of power supply on-line monitoring devices, they are disposed at electric power system and some user's power distribution networks, the power quality parameter that is used for real-time collection, analyzing and processing, demonstration and transmits monitored electrical network respectively;
At least one server, by telephone wire or optical fiber and described some quality of power supply on-line monitoring device composition monitoring networks, be used for the power quality parameter that real-time reception, all quality of power supply on-line monitoring devices of analyzing and processing are sent here, and can offer other multi-user and browse analysis.
2, according to the described quality of power supply online monitoring system of claim 1, it is characterized in that described quality of power supply on-line monitoring device comprises: the three-phase current voltage sampling circuit, two digital signal processor (DSP1, DSP2), two-port RAM, the A/D converter, the I/O controller, program data memory, communication control unit, the FLASH memory, display and keyboard, the A/D converter is connected between sample circuit and the DSP1, two-port RAM is connected between DSP1 and the DSP2 by bus, program data memory, I/O controller and communication control unit all are connected with DSP2 by bus, the FLASH memory, display and keyboard all are connected in the corresponding port of I/O controller.
3, according to the described quality of power supply online monitoring system of claim 2, it is characterized in that: the display of described quality of power supply on-line monitoring device adopts LCD.
4, a kind of quality of power supply on-line monitoring method based on by server be disposed at the supervisory control system that some quality of power supply on-line monitoring devices of electrical network are formed, is characterized in that taking following steps:
A, each quality of power supply on-line monitoring device are gathered the power quality parameter of monitored electrical network in real time, and analyzing and processing, storage show;
B, described quality of power supply on-line monitoring device transmit power quality parameter to server in real time by telephone wire or optical networking;
The power quality parameter that c, server receive in real time, all quality of power supply on-line monitoring devices of analyzing and processing are sent here, and can provide other multi-user to browse analysis.
5, according to the described quality of power supply on-line monitoring of claim 4 method, it is characterized in that: in step a, DSP1 is according to the data in real time signal calculated frequency of A/D conversion, calculate the amplitude and the phase place of 1～25 component of degree n n of three-phase voltage, current signal with fft algorithm, and this signal is transferred to DSP2 by two-port RAM, finish the further computational analysis of sampled data by DSP2, finish the storage on the spot, comparison, communication of data simultaneously, show and the setting of system parameters in real time.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011298804A CN100446382C (en) | 2001-11-04 | 2001-11-04 | System for on-line monitoring quality of electricity and monitoring method |
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| CNB011298804A CN100446382C (en) | 2001-11-04 | 2001-11-04 | System for on-line monitoring quality of electricity and monitoring method |
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| CN1416197A true CN1416197A (en) | 2003-05-07 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100499314C (en) * | 2004-09-30 | 2009-06-10 | 株式会社东芝 | Server, system and method supplied by wide-area instrumenation of electric power system |
| CN101006348B (en) * | 2004-04-18 | 2011-01-05 | 埃莱斯派克工程有限公司 | Power quality monitory |
| CN102170124A (en) * | 2011-03-21 | 2011-08-31 | 江苏省电力试验研究院有限公司 | Early warning method of stable-state index of power quality |
| CN101040416B (en) * | 2004-10-13 | 2011-11-09 | 西门子公司 | Method for controlling the quality of the electron energy of an electrical power supply system |
| CN101595715B (en) * | 2006-11-24 | 2011-11-23 | 普睿司曼股份公司 | Method and system for fiber-optic monitoring of spatially distributed components |
| CN102338835A (en) * | 2011-08-17 | 2012-02-01 | 惠州中城电子科技有限公司 | Power quality dynamic monitoring system |
| CN102445608A (en) * | 2010-10-13 | 2012-05-09 | 深圳市领步科技有限公司 | Monitoring device and calibration method for electric energy quality |
| CN102508015A (en) * | 2011-09-29 | 2012-06-20 | 南京国电南自轨道交通工程有限公司 | Three-in-one real-time load curve construction method for railway power supply system |
| CN101807795B (en) * | 2010-02-12 | 2012-10-17 | 重庆电力科学试验研究院 | Method for forming electric energy metering simulation system and device thereof |
| CN103915895A (en) * | 2013-01-06 | 2014-07-09 | 上海电力通信有限公司 | Comprehensive information acquiring system for transformer substation |
| CN104034960A (en) * | 2014-05-15 | 2014-09-10 | 苏州市万松电气有限公司 | Train-mounted electrical-energy monitoring system with multiple redundancies |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1089765A (en) * | 1993-01-14 | 1994-07-20 | 甘肃力耕应用科学技术研究所 | Monitory and control device for main distribution net work in power distribution station |
-
2001
- 2001-11-04 CN CNB011298804A patent/CN100446382C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101006348B (en) * | 2004-04-18 | 2011-01-05 | 埃莱斯派克工程有限公司 | Power quality monitory |
| CN100499314C (en) * | 2004-09-30 | 2009-06-10 | 株式会社东芝 | Server, system and method supplied by wide-area instrumenation of electric power system |
| CN101040416B (en) * | 2004-10-13 | 2011-11-09 | 西门子公司 | Method for controlling the quality of the electron energy of an electrical power supply system |
| CN101595715B (en) * | 2006-11-24 | 2011-11-23 | 普睿司曼股份公司 | Method and system for fiber-optic monitoring of spatially distributed components |
| CN101807795B (en) * | 2010-02-12 | 2012-10-17 | 重庆电力科学试验研究院 | Method for forming electric energy metering simulation system and device thereof |
| CN102445608A (en) * | 2010-10-13 | 2012-05-09 | 深圳市领步科技有限公司 | Monitoring device and calibration method for electric energy quality |
| CN102445608B (en) * | 2010-10-13 | 2014-02-19 | 领步科技集团有限公司 | Monitoring device and calibration method for electric energy quality |
| CN102170124A (en) * | 2011-03-21 | 2011-08-31 | 江苏省电力试验研究院有限公司 | Early warning method of stable-state index of power quality |
| CN102170124B (en) * | 2011-03-21 | 2013-05-22 | 江苏省电力公司电力科学研究院 | Early warning method of stable-state index of power quality |
| CN102338835A (en) * | 2011-08-17 | 2012-02-01 | 惠州中城电子科技有限公司 | Power quality dynamic monitoring system |
| CN102508015A (en) * | 2011-09-29 | 2012-06-20 | 南京国电南自轨道交通工程有限公司 | Three-in-one real-time load curve construction method for railway power supply system |
| CN103915895A (en) * | 2013-01-06 | 2014-07-09 | 上海电力通信有限公司 | Comprehensive information acquiring system for transformer substation |
| CN104034960A (en) * | 2014-05-15 | 2014-09-10 | 苏州市万松电气有限公司 | Train-mounted electrical-energy monitoring system with multiple redundancies |
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|---|---|
| CN100446382C (en) | 2008-12-24 |
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