CN102157982A - Intelligent terminal for power transformer - Google Patents
Intelligent terminal for power transformer Download PDFInfo
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- CN102157982A CN102157982A CN201110080181XA CN201110080181A CN102157982A CN 102157982 A CN102157982 A CN 102157982A CN 201110080181X A CN201110080181X A CN 201110080181XA CN 201110080181 A CN201110080181 A CN 201110080181A CN 102157982 A CN102157982 A CN 102157982A
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- Y02B70/3266—
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/242—Home appliances
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Abstract
The invention discloses an intelligent terminal for a power transformer, which comprises all function modules, wherein all function modules are connected with a CPU (Central Processing Unit) module through dual CAN (Controller Area Network) buses located on a bus backplane. The intelligent terminal is characterized in that a DSP (Digital Signal Processor) and a plate address dial switch are arranged on each intelligent module, and the CPU module downloads a file with module configuration information to the CPU module by arrangement of a configuration module and automatically recognizes each function module. In the invention, intelligent modules with different transmission requirements are divided into two classes and are connected with the CPU module through the dual CAN buses, high-speed real-time transmission of information is realized, and the information acquisition of the transformer body, the intelligent control of a cooling system and the control and non-electrical-quantity protection function of an on-load tapping switch are completed.
Description
Technical field
The invention belongs to electronic information technical field, patent of the present invention more precisely relates to the novel electric power intelligent transformer terminal based on the GOOSE transmission technology of a kind of 110kV of being applicable to and above electric pressure.
Background technology
The power transformer intelligent terminal belongs to the important key equipment of intelligent substation link in the intelligent grid construction.The primary equipment intellectuality is the outstanding feature that intelligent substation is different from traditional transformer station.Traditional observing and controlling towards function, protective device also progressively develop to OO intelligent assembly direction; intelligent terminal is the process layer equipment of intelligent assembly; with primary equipment get in touch the tightst, its developing direction be realize integrated, structure-integrated towards the function of measurement, control and the defencive function of force device, gather digitlization and Control Networkization.The in-situ digitalization collection of primary equipment requires the information gathering terminal to transfer on the spot, is installed near the outdoor cabinet of primary equipment, converts signal to digital signal on the spot, is transferred to wall or station level equipment by fiber optic network.Control Networkization is exactly by network mode control command to be handed down to the control that near the primary equipment control of intelligent terminal is realized primary equipment.Digital collection and networking control use the optical fiber communication mode to replace traditional cable control mode, have saved a large amount of cable input costs, have improved the shared rate and the standardization of information simultaneously.Integrated and the structure-integrated design of function helps the high efficiency of transmission of information, reduces the quantity of screen cabinet, the cost of saving equipment, the debugging of simplified apparatus and maintenance, the floor space of minimizing transformer station, the intelligent degree of raising equipment.The power transformer intelligent terminal be exactly under this technical background at 110kV and above electric pressure design of transformer have function integrated, structure-integrated, gather the intelligent substation equipment of digitlization and Control Network feature.Following technology has been adopted in the development of novel electric power intelligent transformer terminal:
The IEC61850 standard is followed in strictness: the IEC61850 standard is in the intelligent substation and the message transmission between transformer station and the scheduling has been formulated unified standard and mechanism, be the important evidence of interoperability between exchange between the measurement equipment, equipment and the miscellaneous equipment, its content has mainly comprised intelligent terminal data modeling, network architecture, message transmission mechanism and standard etc.
The process layer GOOSE communication technology: the IEC61850 standard is divided into three layers with the power transformation station equipment, and process layer, wall and station level, intelligent terminal belong to process layer equipment.Intelligent terminal and external information interaction are based on process layer communication network, adopt GOOSE (towards the transformer substation case of general object) communication mode, the GOOSE communication mode requires very high to real-time, the communication delay of IEC61850 standard code GOOSE signal should be less than 4ms, be mainly used in and transmit at interval block signal, believe and also can be used for transmitting some remote measurements, remote signalling information by trip signal in real time.
IEC61588 to the time technology: IEC61588 be the accurate clock synchronization protocol that is applied to Industry Control and fields of measurement with the wonderful level of sub-micro synchronizing function.IEC61588 to the time process do not rely on GPS, be not subject to external interference, but by network communication mode, its to the time process comprised for two steps: (1) determines to provide in the network equipment of master clock; (2) by calculating principal and subordinate's clock offset and network delay correction slave unit clock.
Document one " power transformer comprehensive intelligent assembly " (Chinese patent application number 201010543538.9) has disclosed a kind of collection and analytical equipment of transformer panorama information, be referred to as intelligent transformer assembly master IED, the brain that is equivalent to the people is finished collection, analysis and the condition diagnosing function of transformer information.
The intelligent transformer scheme that proposes in the document two " high-tension apparatus intellectualized technology guide rule " is realized measurement function, cooling system controlled function, on load tap changer controlled function and the non electrical quantity defencive function of transformer body respectively by four independent device.
Summary of the invention
Technical problem to be solved by this invention provides the type power transformer intelligent terminal of a kind of 110kV of being applicable to and above electric pressure, the information gathering that can realize transformer equipment is changed on the spot, Control Networkization, function are integrated, save cost, the resource-sharing and the standardization that improve information simultaneously.
For solving the problems of the technologies described above, the present invention takes following technical scheme to realize:
A kind of power transformer intelligent terminal, comprise each function module, each function module is connected with the CPU module by the two CAN network bus that are positioned on the bus backplane, it is characterized in that: be provided with dsp processor and plate address toggle switch on each intelligent modular unit, the CPU module will have by device configuration configuration module under the file of module configuration information and install to the CPU module, the CPU module is discerned each function module automatically, and the quantity of each module can be according to the increase in demand or the minimizing at scene.
Aforesaid power transformer intelligent terminal is characterized in that: described each function module comprises that power supply module, man-machine interface module, intelligent small-signal DC quantity collection module, intelligent AC amount collection module, intelligent switch amount collection module, intelligence are left module, intelligence is opened into module, non electrical quantity defencive function module and operation circuit module.
Aforesaid power transformer intelligent terminal; it is characterized in that: the intelligence that real-time is had relatively high expectations leaves module and non electrical quantity defencive function module carries out information interaction by CANB separately, and intelligence is opened into module, intelligent AC amount collection module, intelligent small-signal DC quantity and gathered module and carry out information interaction by CANA and CPU module.
Aforesaid power transformer intelligent terminal; it is characterized in that: described power supply module is left module with man-machine interface module, CPU module, intelligent small-signal DC quantity collection module, intelligent AC amount collection module, intelligent switch amount collection module, intelligence respectively, non electrical quantity defencive function module links to each other with the operation circuit module; support 88VDC～264VDC wide region input; output 5V and 24V DC power supply, generator alarm simultaneously and the empty output signal node of device locking.
Aforesaid power transformer intelligent terminal is characterized in that: described man-machine interface module adopts the PIC processor, by carrying out information interaction between serial communication mode and the CPU module, realizes LED and liquid crystal display, functions such as keyboard operation.
Aforesaid power transformer intelligent terminal, it is characterized in that: described CPU module adopts the high-performance POWERPC processor when supporting 1588 pairs, possess 10 100M fiber optic Ethernet interfaces be used for implementation procedure layer GOOSE communication and 1588 networks to the time function, and target transformer ontology information is passed to bay device and is finished cooling system Based Intelligent Control function with the GOOSE message mode according to IEC61850 standard unified Modeling will be with the time.
Aforesaid power transformer intelligent terminal, it is characterized in that: described intelligent small-signal DC quantity is gathered module and is linked to each other with temperature of oil in transformer, oil level, ambient temperature, humidity sensor, gather 0-5V or 4-20mA DC quantity signal, realize the collection of temperature of oil in transformer, oil level, ambient temperature, humidity, and signal is passed to the CPU module by internal bus.
Aforesaid power transformer intelligent terminal, it is characterized in that: described intelligent AC amount is gathered operating voltage and the current signals that module can be used for cooling system fan and oil pump, realization is to its Stateful Inspection, and signal is passed to the CPU module by internal bus.
Aforesaid power transformer intelligent terminal, it is characterized in that: described intelligent switch amount is gathered module through light-coupled isolation, gather DC110V or DC220V DC quantity switching signal, realize signals collecting such as fan opening, gear, oil flow relay state, and signal is passed to the CPU module by internal bus.
Aforesaid power transformer intelligent terminal, it is characterized in that: described intelligence is left module and is adopted hermetically sealed entrance relay, realize the relay output function that cooling system control and gear are regulated control, can accept the control command that the CPU module sends by internal bus.
Aforesaid power transformer intelligent terminal is characterized in that: described non electrical quantity defencive function module is used for the collection and the tripping operation output function of Buchholz relay signal, pressure release signal, overtemperature signal, and sends trip signal to the CPU module.
Aforesaid power transformer intelligent terminal; it is characterized in that: described operation circuit module has a tripping operation input contact and 12 tripping operation output contacts; protect the tripping operation output contact of module to insert this module input contact non electrical quantity, can realize synchronous trip avoidance function a plurality of objects.
The present invention first will be relevant with the transformer body all measurements, cooling system and on load tap changer Based Intelligent Control and non electrical quantity defencive function concentrate design; save equipment cost and screen cabinet installing space; simplify network configuration, embodied very high integrated level and advance.Carry out information interaction according to IEC61850 standard and bay device; support IEC61588 to the time function; its measurement, control and non electrical quantity defencive function and module quantity can be according to on-the-spot needs flexible configuration; satisfy the intelligentized demand of transformer equipment in the intelligent substation construction; internal communication adopts the dual CAN bus mode simultaneously, has guaranteed the real-time of network tripping operation.
Description of drawings
Fig. 1 is the overall structure figure of power transformer intelligent terminal of the present invention;
Fig. 2 is that power transformer intelligent terminal of the present invention combines the schematic diagram of realizing cooling system Based Intelligent Control function with intelligent transformer assembly master IED;
Fig. 3 is that power transformer intelligent terminal of the present invention cooperates the schematic diagram of realizing on load tap changer Based Intelligent Control function with intelligent transformer assembly master IED;
Fig. 4 is a power transformer intelligent terminal non electrical quantity defencive function schematic diagram of the present invention;
Fig. 5 is that power transformer intelligent terminal measurement function of the present invention is realized schematic diagram;
Embodiment
Be a preferred embodiment of the present invention below the embodiment, comprised the method that adopts intelligent transformer terminal of the present invention, realizes intelligent transformerization in conjunction with miscellaneous equipment and system.Other features, objects and advantages of the present invention also can be found out from the explanation of embodiment and accompanying drawing.
At first introduce the overall structure of power transformer intelligent terminal of the present invention; can see that from accompanying drawing 1 power transformer intelligent terminal of the present invention adopts modular construction, comprise that power supply module, man-machine interface module, intelligent small-signal DC quantity collection module, intelligent AC amount collection module, intelligent switch amount collection module, intelligence are left module, intelligence is opened into module, non electrical quantity defencive function module, operation circuit module, CPU module.The CPU module carries out information interaction by dual CAN bus and other intelligent modular unit; the intelligence of having relatively high expectations for real-time is left with non electrical quantity defencive function module and is carried out information interaction by CANB separately, and intelligence is opened and gathered module into module, intelligent AC amount module, intelligent DC amount and carry out information interaction by CANA and CPU module.Design has the address toggle switch on each intelligent modular unit, disposes the automatic identification that the configuration instrument mode realizes intelligent modular unit by dial-up address and device, so but the quantity flexible configuration of each function module, The field is very flexible, safeguards also very convenient.
The CPU module support the IRIG-B sign indicating number to the time and two kinds of IEC61588 to the time signal input, with two kinds to the time information arbitrate and resolve to message add pulse per second (PPS) (1PPS) or divide pulse (1PPM) mode give each intelligent modular unit to the time, as shown in Figure 1.Each intelligent modular unit can be stamped markers with the information or the action situation of gathering the very first time, is convenient to follow-up analysis and application.Among Fig. 1: POW-power supply module, AIM-intelligence small-signal DC quantity is gathered module, and BIM-intelligent switch amount is gathered module, and DLM-intelligent AC amount is gathered module, and BOT-intelligence is left module, FDL-non electrical quantity defencive function module, CDM-operation circuit module.
The design of CPU module has 10 100M fiber optic network interfaces, but equal access procedure layer GOOSE network also can be realized point-to-point communication with protection, measurement and control unit.
The power supply module provides work and signal power source for other module except operation circuit and man-machine interface module by the bus backplane mode.
Adopt serial communication mode between man-machine interface module and the CPU module, realized that the LED of signals such as non-electric charge quantity signalling alarm or non-electric charge quantity signalling action shows, and whole the ordering of demonstration, control and definite value of remote measurement, remote signalling, remote information.
Fig. 2 is an intelligent terminal cooling system Based Intelligent Control function implementation schematic diagram, intelligent DC amount small-signal is gathered the oily benign environment temperature signal that module (AIM) is gathered 4-20mA, and give CPU module with metrical information by the CANA bus, the intelligent AC amount is gathered module (DLM) and is gathered the operating state of cooling fan and oil pump and give CPU module by CANA, each side information on load of main transformer that the CPU module obtains by GOOSE mode receiving transformer intelligent assembly master IED, the control strategy that the above-mentioned information that comprehensive AIM and DLM gather forms transformer cooling system sends the automatic switching function that control command realizes cooling fan by the CANB bus.
Fig. 3 is an intelligent terminal on load tap changer Based Intelligent Control function implementation schematic diagram, the control of considering on load tap changer need cooperate with capacitor switching, so there is the Intelligent Control Strategy of carrying the merogenesis switch to need to carry out information interaction with the VQC system on backstage, gather three side voltages simultaneously, in intelligent transformer assembly master IED, form, the order of will transferring the files sends to intelligent terminal in the GOOSE mode, intelligent terminal receives to be issued intelligence by the CANB bus after the order and leaves module (BOT), realizes the adjusting of gear.
Fig. 4 is an intelligent terminal non electrical quantity defencive function implementation schematic diagram, and the design of intelligent non electrical quantity function module has 3 groups of non-electric charge quantity signallings inputs and trip signal output interface, when non electrical quantity number during more than 3, and configurable polylith non electrical quantity function module.The non electrical quantity function module can cooperate with the operation circuit module, with the heavily moving input signal of tripping operation output signal access operation loop module, can realize the synchronous trip avoidance function of a plurality of objects.Intelligent non electrical quantity function module is given CPU module with actuating signal by inner CANB bus simultaneously, and the CPU module is given other equipment by the GOOSE mode with information according to the IEC61850 standard.
Fig. 5 is the schematic diagram that intelligent terminal is realized measurement function, the AIM module is realized the measurement of DC quantity small-signal, as oil temperature, winding temperature, ambient temperature etc., the BIN module is realized the measurement of switching value signal, as gear, the heavy gas of pressure regulation, the release of pressure regulation pressure, cooler full cut-off, pressure regulation oil temperature abnormality etc., the DLM module is realized the collection of of ac signal, as the voltage of cooling fan work, electric current etc.Each gathers module quantity can increase according to the needs at scene or reduce.Each module is given CPU module by the CANA bus with information with measuring-signal, and the CPU module is given miscellaneous equipment with information according to the IEC61850 standard.
Intelligent terminal of the present invention possesses following characteristics:
1, transformer non electrical quantity defencive function, body measurement function, cooling system Based Intelligent Control, on-load voltage regulation controlled function are merged design, the functional integration height has 10 road Guang Kou, satisfies the access of a plurality of objects, adopt 4U complete machine case plug-in unit fabricated structure, compact conformation;
2, based on GOOSE real time communication technology, carry out data modeling and communicate by letter according to the IEC61850 standard, the standardization level height, interoperability and interchangeability are good;
3, support simultaneously the IEC61588 network to the time and the IRIG-B function, to the time mode flexible, to the time precision height;
4, hardware and software all adopts modular design method, and function and capacity configuration are flexible, is easy to expansion and safeguards that two CAN network bus are adopted in intercommunication, satisfies tripping operation and waits at a high speed transmission demand in real time;
5, the device antijamming capability is strong, can be installed near the outdoor cabinet of transformer.
The present invention is illustrated according to the preferred embodiment, should be appreciated that but the foregoing description does not limit the present invention in any form, and all employings are equal to replaces or the technical scheme that form obtained of equivalent transformation, all drops within protection scope of the present invention.
Claims (12)
1. power transformer intelligent terminal, comprise each function module, each function module is connected with the CPU module by the two CAN network bus that are positioned on the bus backplane, it is characterized in that: be provided with dsp processor and plate address toggle switch on each intelligent modular unit, the CPU module will have by device configuration configuration module under the file of module configuration information and install to the CPU module, and the CPU module is discerned each function module automatically.
2. power transformer intelligent terminal according to claim 1 is characterized in that: described each function module comprises that power supply module, man-machine interface module, intelligent small-signal DC quantity collection module, intelligent AC amount collection module, intelligent switch amount collection module, intelligence are left module, intelligence is opened into module, non electrical quantity defencive function module and operation circuit module.
3. power transformer intelligent terminal according to claim 2; it is characterized in that: the intelligence that real-time is had relatively high expectations leaves module and non electrical quantity defencive function module carries out information interaction by CANB separately, and intelligence is opened into module, intelligent AC amount collection module, intelligent small-signal DC quantity and gathered module and carry out information interaction by CANA and CPU module.
4. power transformer intelligent terminal according to claim 2; it is characterized in that: described power supply module is left module with man-machine interface module, CPU module, intelligent small-signal DC quantity collection module, intelligent AC amount collection module, intelligent switch amount collection module, intelligence respectively, non electrical quantity defencive function module links to each other with the operation circuit module; support 88VDC～264VDC wide region input; output 5V and 24V DC power supply, generator alarm simultaneously and the empty output signal node of device locking.
5. power transformer intelligent terminal according to claim 2 is characterized in that: described man-machine interface module adopts the PIC processor, by carrying out information interaction between serial communication mode and the CPU module, realizes LED and liquid crystal display, the keyboard operation function.
6. power transformer intelligent terminal according to claim 2, it is characterized in that: described CPU module adopts the high-performance POWERPC processor when supporting 1588 pairs, possess 10 100M fiber optic Ethernet interfaces be used for implementation procedure layer GOOSE communication and 1588 networks to the time function, and target transformer ontology information is passed to bay device and is finished cooling system Based Intelligent Control function with the GOOSE message mode according to IEC61850 standard unified Modeling will be with the time.
7. power transformer intelligent terminal according to claim 2, it is characterized in that: described intelligent small-signal DC quantity is gathered module and is linked to each other with temperature of oil in transformer, oil level, ambient temperature, humidity sensor, gather 0-5V or 4-20mA DC quantity signal, realize the collection of temperature of oil in transformer, oil level, ambient temperature, humidity, and signal is passed to the CPU module by internal bus.
8. power transformer intelligent terminal according to claim 2, it is characterized in that: described intelligent AC amount is gathered operating voltage and the current signals that module is used for cooling system fan and oil pump, realization is to its Stateful Inspection, and signal is passed to the CPU module by internal bus.
9. power transformer intelligent terminal according to claim 2, it is characterized in that: described intelligent switch amount is gathered module through light-coupled isolation, gather DC110V or DC220V DC quantity switching signal, realize fan opening, gear, oil flow relay state signal collecting, and signal is passed to the CPU module by internal bus.
10. power transformer intelligent terminal according to claim 2, it is characterized in that: described intelligence is left module and is adopted hermetically sealed entrance relay, realize the relay output function that cooling system control and gear are regulated control, can accept the control command that the CPU module sends by internal bus.
11. power transformer intelligent terminal according to claim 2; it is characterized in that: described non electrical quantity defencive function module is used for the collection and the tripping operation output function of Buchholz relay signal, pressure release signal, overtemperature signal, and sends trip signal to the CPU module.
12. power transformer intelligent terminal according to claim 2; it is characterized in that: described operation circuit module has a tripping operation input contact and 12 tripping operation output contacts; protect the tripping operation output contact of module to insert this module input contact non electrical quantity, can realize synchronous trip avoidance function a plurality of objects.
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| CN201110080181.XA CN102157982B (en) | 2011-03-31 | 2011-03-31 | Intelligent terminal for power transformer |
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Cited By (11)
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| CN102412567A (en) * | 2011-10-17 | 2012-04-11 | 费江海 | Synthetical protector for controller area network (CAN) power system and using method thereof |
| CN102769337A (en) * | 2012-07-09 | 2012-11-07 | 中国电力科学研究院 | Protection, measurement and control integrated device |
| CN102957209A (en) * | 2012-11-06 | 2013-03-06 | 浙江省电力公司 | Integrated measurement and control device of intelligent transformer substation |
| CN103206984A (en) * | 2013-03-26 | 2013-07-17 | 国家电网公司 | Intelligent component for oil-immersed transformer |
| CN103513569A (en) * | 2013-09-17 | 2014-01-15 | 国家电网公司 | Method for synchronizing redundant time of intelligent substation |
| CN103543353A (en) * | 2013-09-24 | 2014-01-29 | 许继集团有限公司 | Direct-current sampling method in wide-temperature environment |
| CN103592540A (en) * | 2013-11-12 | 2014-02-19 | 国家电网公司 | High-accuracy direct current collecting method under wide-temperature environment |
| CN103647262A (en) * | 2013-10-25 | 2014-03-19 | 北京四方继保自动化股份有限公司 | In-situ placement type miniature intelligent relay protection device |
| CN104953710A (en) * | 2015-06-16 | 2015-09-30 | 深圳供电局有限公司 | Intelligent integrated sampling device, intelligent network distribution terminal and power distribution network |
| CN106646080A (en) * | 2016-12-09 | 2017-05-10 | 广东佛电电器有限公司 | Intelligent monitoring terminal for low-voltage power grid |
| CN107069956A (en) * | 2017-03-14 | 2017-08-18 | 江苏骏龙光电科技股份有限公司 | A kind of cabinet type comprehensive power transformer intelligent assembly |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412567A (en) * | 2011-10-17 | 2012-04-11 | 费江海 | Synthetical protector for controller area network (CAN) power system and using method thereof |
| CN102412567B (en) * | 2011-10-17 | 2014-04-09 | 费江海 | Synthetical protector for controller area network (CAN) power system and using method thereof |
| CN102769337B (en) * | 2012-07-09 | 2015-12-02 | 中国电力科学研究院 | A kind of protection measurement and control integration device |
| CN102769337A (en) * | 2012-07-09 | 2012-11-07 | 中国电力科学研究院 | Protection, measurement and control integrated device |
| CN102957209A (en) * | 2012-11-06 | 2013-03-06 | 浙江省电力公司 | Integrated measurement and control device of intelligent transformer substation |
| CN103206984A (en) * | 2013-03-26 | 2013-07-17 | 国家电网公司 | Intelligent component for oil-immersed transformer |
| CN103513569A (en) * | 2013-09-17 | 2014-01-15 | 国家电网公司 | Method for synchronizing redundant time of intelligent substation |
| CN103543353A (en) * | 2013-09-24 | 2014-01-29 | 许继集团有限公司 | Direct-current sampling method in wide-temperature environment |
| CN103543353B (en) * | 2013-09-24 | 2016-04-13 | 许继集团有限公司 | Direct current acquisition method under a kind of wide temperature environment |
| CN103647262A (en) * | 2013-10-25 | 2014-03-19 | 北京四方继保自动化股份有限公司 | In-situ placement type miniature intelligent relay protection device |
| CN103592540A (en) * | 2013-11-12 | 2014-02-19 | 国家电网公司 | High-accuracy direct current collecting method under wide-temperature environment |
| CN104953710A (en) * | 2015-06-16 | 2015-09-30 | 深圳供电局有限公司 | Intelligent integrated sampling device, intelligent network distribution terminal and power distribution network |
| CN106646080A (en) * | 2016-12-09 | 2017-05-10 | 广东佛电电器有限公司 | Intelligent monitoring terminal for low-voltage power grid |
| CN107069956A (en) * | 2017-03-14 | 2017-08-18 | 江苏骏龙光电科技股份有限公司 | A kind of cabinet type comprehensive power transformer intelligent assembly |
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| Publication number | Publication date |
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| CN102157982B (en) | 2014-05-28 |
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