CN200983517Y - Dual-power supply automatic switching device - Google Patents
Dual-power supply automatic switching device Download PDFInfo
- Publication number
- CN200983517Y CN200983517Y CNU2006200531302U CN200620053130U CN200983517Y CN 200983517 Y CN200983517 Y CN 200983517Y CN U2006200531302 U CNU2006200531302 U CN U2006200531302U CN 200620053130 U CN200620053130 U CN 200620053130U CN 200983517 Y CN200983517 Y CN 200983517Y
- Authority
- CN
- China
- Prior art keywords
- power supply
- circuit
- power
- switching
- control section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- 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
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model relates to a dual power automatic switch device belonging to dual power automatic switching devices of distribution system, which comprises a power switch portion, a control portion, a signal detecting circuit and a working power supply, the utility model is characterized in that the working power supply is acquired from an electric network inlet wire, switching of working and emergency power supply is the duty of the power switching portion, output terminals of a back-up power UPS output two ways of circuit which are +5V and +12V via the back-up power UPS, wherein one way of the back-up power UPS is supplied for a diverter switch circuit and the other one is rectified and transformed. The utility model has high reliability, no anxiety of loss of power and ability of displaying operational parameters, and has a communication port used for remote supervisory and controlling.
Description
Technical field
The utility model belongs to distribution system duplicate supply automatic bus, is specifically related to a kind of dual power supply automatic switching device.
Background technology
Power supply entering line adopts in electric power system extensively, and particularly large-scale enterprises and institutions or important industrial enterprise distribution system in order to guarantee power reguirements, often adopt this pattern.This pattern not only will realize protection and observing and controlling function respectively to two inlet wires, also must consider two inlet wires prepared auto restart function each other.Traditional method is to use automatic power switch.The automatic power switch of prior art superpressure occurs or when under-voltage at power supply, can realize load circuit from an automatic changing-over of power supply realizing the continuous power supply to load circuit to another power supply; And when overload or short circuit appear in load circuit, can cut off power supply, reach the purpose of protection circuit, load equipment and personal safety.It includes a diverter switch that connects two-way inlet wire and one tunnel outlet respectively as Chinese utility model patent 02245581.7 disclosed a kind of " intelligent duplicate supply switching device ", cpu circuit and display circuit, but they provide the design of working power to have a problem to cpu circuit and display circuit, when promptly in case the two-way inlet wire does not all have electricity, the service data of CPU is with disorder, all simultaneously parameters can't show at display checks, so both caused maintenance line and the inconvenience of searching failure cause, and cause misjudgment easily, also be unfavorable for circuit is monitored in real time; And can not set running parameter within the specific limits arbitrarily and realize remote monitoring, its automaticity is not enough.
The utility model content:
Technical problem to be solved in the utility model is, on the basis of existing technology, provides a kind of good reliability, is not afraid of power down, can shows operational factor and has the dual power supply automatic switching device of remote monitoring communication port.
For solving the problems of the technologies described above, the utility model is achieved in that a kind of dual power supply automatic switching device, comprises power supply switching part, control section, signal deteching circuit and working power; The switching signal that main control chip circuit in the control section is produced is connected on the switching switch circuit in the power supply switching part by the Switching power drive circuit; Signal deteching circuit carries out the phase voltage detection to the voltage of power supply commonly used and two groups of power supplies of stand-by power supply, and its output connects the main control chip circuit by the A/D change-over circuit in the control section; Above-mentioned working power is to obtain by the electrical network inlet wire, by power supply switching part conversion power supply commonly used, stand-by power supply,, supply switching switch circuit from back-up source UPS one tunnel through back-up source UPS, another road is through rectifying conversion, output output+5V ,+12V two-way direct current; Be connected with communication interface circuit and warning circuit, the output termination loud speaker of warning circuit on the main control chip circuit in the above-mentioned control section.
The utility model can realize under the unattended duty situation that duplicate supply automaticallyes switch, and is accurate to 0.1 second switching time, and haul oneself willingly into runback, haul oneself willingly into not runback, several working ways such as manual.The utility model switching switch circuit adopts back-up source UPS to be connected rectification circuit with the control section power supply, and when the two-way inlet wire did not all have electricity, the service data of CPU can be not disorderly, thereby make the power supply major loop not be afraid of power down, the reliability height.In actual use, when power supply commonly used just often, the utility model diverter switch is connected power supply commonly used automatically, in case it is undesired to detect power supply commonly used, during as overvoltage, under-voltage, phase shortage or power down, switch to stand-by power supply power supply immediately, when power up commonly used just often, automatically switch to power supply commonly used again and power; When user side overcurrent, short circuit, the utility model diverter switch is cut off power supply rapidly, and the mechanical mechanism in the control its switch disconnects two groups of power supplies fully; Shows signal outputs to indication fault situation and alarm condition on display screen and the remote computer that is connected by communication interface.
Description of drawings
Describe the utility model below in conjunction with accompanying drawing in detail with concrete execution mode
Fig. 1 is that the utility model is formed block diagram;
Fig. 2 is the utility model power supply switching part and working power circuit figure;
Fig. 3 is the utility model control section circuit diagram;
Fig. 4 is the utility model signal deteching circuit figure.
Embodiment
The block diagram of a kind of dual power supply automatic switching device of accompanying drawing 1 expression comprises power supply switching part, control section, signal deteching circuit and working power; The switching signal that main control chip circuit 1 in the control section is produced is connected on the switching switch circuit 10 in the power supply switching part by Switching power drive circuit 8, comprise also in the power supply switching part that SK1 is the automatic/hand switch, when SK1 dialled when " manually ", system restoration is artificial switching state; The voltage of 12 pairs of power supplys commonly used of signal deteching circuit and two groups of power supplies of stand-by power supply carries out phase voltage and detects, and its output connects main control chip circuit 1 by the A/D change-over circuit in the control section 7; Be connected with data storage 2, clock circuit 3, display screen circuit 4, keyboard 5, communication interface circuit 6 and warning circuit 9 on the main control chip circuit 1 in the above-mentioned control section.Above-mentioned working power is to obtain by the electrical network inlet wire, by power supply switching part conversion power supply commonly used, stand-by power supply,, supply switching switch circuit 10 from back-up source UPS one tunnel through back-up source UPS, another road is through rectifying conversion, output output+5V ,+12V two-way direct current.
This double power supply converting switch circuit 10 of accompanying drawing 2 expression adopts back-up source UPS power supply, to avoid in handoff procedure out of control to power supply.Working power 11 is to obtain by the electrical network inlet wire, by the conversion of the interlock circuit of A.C. contactor KM1, KM2 with use power supply always, stand-by power supply two-way inlet wire is connected, be passed to back-up source UPS, supply switching switch circuit 10 from back-up source UPS one tunnel, another road is through step-down, silicon bridge rectifying conversion, capacitor C 10, C11 filtering, 7805 three-terminal voltage-stabilizings, output output+5V ,+12V two-way direct current.The switching of power supply is undertaken by button AN1 or the AN2 that presses in the keyboard 5 among the figure, and HL1, HL2 are the signal indication of A.C. contactor KM1, KM2 work, and K1 herein and K2 are for driving the control contact of relay.
Control section electricity principle is seen Fig. 3, main control chip circuit 1 adopts IC2 AT89S52, be connected with the data storage 2 that constitutes by pin-saving chip IC6 AT24C04 and resistance R 10, R11 on the main control chip circuit 1, by 6MHz crystal XT, the clock circuit 3 that capacitor C 2, C3 form, by display screen, inverter ic 1 74SL04 with drive the display screen circuit 4 that triode V2, V3, V4 form.The A/D change-over circuit 7 that is constituted by 8D latch IC3 74LS373, converter IC 4 ADC0809A/D, NOR gate IC5 74LS02.Main control chip circuit 1 detects two-way voltage in real time by A/D conversion chip IC4 ADC0809, the supply voltage that is higher than the upper limit or is lower than lower limit is judged to improper voltage, 1 pair of testing result of main control chip circuit is carried out logic determines, affirmation, after certain time-delay switching time, send separating brake or reclosing command by relay K 1 and relay K 2 in the Switching power drive circuit 8 to switching switch circuit 10, finish the switching of two-way power supply.
Connect main control chip circuit 1 and also have keyboard 5, communication interface circuit 6, warning circuit 9 and drive circuit 8.Warning circuit 9 is formed by driving triode V1 and alarm bell generator; Communication interface circuit 6 adopts interface chip IC7 MAX232AMP120, and the pale pinkish purple P532 of two photoelectricity forms; The output termination loud speaker of warning circuit 9; Drive circuit 8 is to constitute by driving triode V6, V7 and driving relay K 1, K2, also is parallel with red, green LED 1, LED2 on relay K 1, the K2; AN1 is a function key in the keyboard 5, and AN2 is that to select key, AN3 be to increase key in the position, and AN4 is the duplicate supply switch key, and AN5 is the switch key that three groups of line voltages show, AN6 is the ann reset key.When needing to set, click AN1, display screen 4 charactrons show that first charactron of the current upper voltage limit set point and the left side is blink states, and at this moment, whenever by once increasing key AN3, this bit value adds 1, repeatedly presses AN3, can set any numerical value of 0～9.Click the position and select key AN2, left side second order digit sign indicating number pipe is blink states, presses AN3, sets this bit value.Click AN2 again, set the 3rd bit value.Press for the second time AN1, setting voltage lower limit in the same way.Press AN1 for the third time, display screen 4 charactrons show current switching time of set point, and second order digit sign indicating number pipe decimal is lighted, and configures the handoff delay time in the same way, and setting range is 0～19.9 second.Press AN1 the 4th time, display screen 4 charactrons show the current runback set condition of hauling oneself willingly into, first charactron in the left side is blink states, pressing AN3 can make it change between 0～1, wherein runback is hauled oneself willingly in 0 expression, not runback is hauled oneself willingly in 1 expression, presses AN1 once more, upper voltage limit value, lower limit, switching time, hauls oneself willingly into the IC6 AT24C04 that the runback set condition is written in the data storage 2 and forever preserves.This control section can be realized following three kinds of functions according to hauling oneself willingly into runback and hauling oneself willingly into the not setting of runback:
1. haul oneself willingly under the runback normal condition by power supply power supply commonly used, when the arbitrary phase voltage of power supply commonly used exceeds setting range, and KM1 disconnects behind software certification, power supply commonly used is cut, KM2 closure behind the delay time through setting is connected stand-by power supply, after power up commonly used is normal, automatically return by power supply power supply commonly used, when power supply commonly used breaks down, power by stand-by power supply again.In handoff procedure, display screen 4 charactrons show " SCH ", when the two-way power supply all has fault, display screen 4 charactrons show " SCH " always, mean " searching ", and this moment, KM1, KM2 all disconnected, when arbitrary road power up wherein just often, system can automatically switch to this road power supply.
2. do not haul oneself willingly into and power by power supply commonly used under the runback normal condition, when power supply commonly used breaks down or be unusual, switch to stand-by power supply behind the delay time through setting, but after power up commonly used is normal, can not automatically reply.When stand-by power supply broke down or be unusual, screen display " EEE " was also opened warning circuit and is reported to the police.Can press AN6 and reset this moment.
3. do not haul oneself willingly into and power by power supply commonly used under the runback normal condition, when user side overcurrent, short trouble occur or when unusual, display screen 4 shows " EEE " and opens warning circuit and report to the police that the mechanical mechanism in system's control its switch disconnects two groups of power supplies fully.
During operate as normal, charactron shows the line magnitude of voltage of current power supply, presses AN5, can finish the switching that AB, BC, three groups of line voltages of AC are shown.In the work, pressing AN4 can switch duplicate supply, does not influence automatically after switching and carries out.
Accompanying drawing 4 expression signal deteching circuits 12 carry out phase voltage by voltage transformer T1～T7, sample resistance RP1～RP6 to the voltage of using power supply and two groups of power supplies of stand-by power supply always and detect, and its output connects main control chip circuit 1 by the A/D change-over circuit in the control section 7.
The application software design principle of present embodiment is as follows.Because present embodiment detects just in order to judge whether supply voltage is unusual the testing circuit 12 of power supply, consider the convenience of calculating and programming, IC3 has selected 8 A/D modular converter ADC0809 for use, resolution setting is 2V, main control chip circuit 1 can detect the voltage from 0V to 512V like this, its error is 2V/512V=0.39%, can meet the demands fully.Main RAM is allocated as follows in the sheet: 30H～35H is six road A/D transformation result storage units, 40H41H, 42H43H, 44H45H, 46H is respectively higher limit, lower limit, switching time, haul oneself willingly into runback sign storage unit, 50H～5BH is conversion back six road voltage decimal system storage units, 37H38H, 3AH～3CH is two～decimal code conversion unloading unit, 4BH～4DH is the display buffer, 5CH deposits key, 5DH deposits the AN1 bond order, 5EH deposits the AN2 bond order, 62H is the FC subaddressing storage unit that reads and writes data, 66H is for transmitting the byte number storage unit, and 67H writes storage unit for the addressing byte, and 69H reads storage unit for the addressing byte.
After present embodiment completed, the IC1 AT89S52 that plugs the good program of programming can move.If display screen 4 charactrons show " SCH " or " EEE " always, illustrate that employed IC6 24C04 is a blank chip.At this moment, as long as press button, the setting of carry out upper voltage limit value, lower limit, switching time, hauling oneself willingly into the runback sign, just corresponding data can write in the corresponding unit of 24C04 with location headed by the 20H, start later on can normally be used.
Claims (3)
1, a kind of dual power supply automatic switching device comprises power supply switching part, control section, signal deteching circuit and working power; The switching signal that main control chip circuit (1) in the control section is produced is connected on the switching switch circuit (10) in the power supply switching part by Switching power drive circuit (8); Signal deteching circuit (12) carries out the phase voltage detection to the voltage of power supply commonly used and two groups of power supplies of stand-by power supply, and its output connects main control chip circuit (1) by the A/D change-over circuit (7) in the control section; It is characterized in that: above-mentioned working power is to obtain by the electrical network inlet wire, by power supply switching part conversion power supply commonly used, stand-by power supply, through back-up source UPS, supply switching switch circuit (10) from back-up source UPS one tunnel, another road is through rectifying conversion, output output+5V ,+12V two-way direct current.
2, dual power supply automatic switching device according to claim 1 is characterized in that: be connected with communication interface circuit (6) on the main control chip circuit (1) in the above-mentioned control section.
3, dual power supply automatic switching device according to claim 1 is characterized in that: be connected with warning circuit (9), the output termination loud speaker of warning circuit (9) on the main control chip circuit (1) in the above-mentioned control section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200531302U CN200983517Y (en) | 2006-12-12 | 2006-12-12 | Dual-power supply automatic switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200531302U CN200983517Y (en) | 2006-12-12 | 2006-12-12 | Dual-power supply automatic switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200983517Y true CN200983517Y (en) | 2007-11-28 |
Family
ID=38910667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200531302U Expired - Fee Related CN200983517Y (en) | 2006-12-12 | 2006-12-12 | Dual-power supply automatic switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200983517Y (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393510A (en) * | 2011-09-16 | 2012-03-28 | 福建俊豪电子有限公司 | Detection system for standing power supply |
| CN102075000B (en) * | 2009-11-20 | 2013-03-06 | 北京国铁路阳技术有限公司 | Automatic control method for high-reliability power supply system with set of spare circuit |
| CN102957200A (en) * | 2012-12-05 | 2013-03-06 | 浙江理工大学 | Method and system for managing backup power supply of underwater real-time detecting instrument |
| CN103178605A (en) * | 2011-12-24 | 2013-06-26 | 苏州飞腾电器有限公司 | Power switching switch |
| CN103259329A (en) * | 2013-05-28 | 2013-08-21 | 南京海勇电子科技有限公司 | Direct-current multiple-power switch-over switch |
| CN105449840A (en) * | 2016-01-16 | 2016-03-30 | 北京正丰电子科技有限公司 | An intelligent sensor using wireless charging technology and an application system thereof |
| CN107528241A (en) * | 2017-07-27 | 2017-12-29 | 杭州电力设备制造有限公司 | A kind of three pairs of cabinet spare powers and automatic switching method |
| CN108200702A (en) * | 2017-12-30 | 2018-06-22 | 湖南汇博电子科技股份有限公司 | Fire emergency equipment and fire emergency control method |
| CN110445247A (en) * | 2019-08-16 | 2019-11-12 | 深圳市智微智能软件开发有限公司 | High reliability redundancy electric power supply system and method |
| CN110994774A (en) * | 2019-11-11 | 2020-04-10 | 广州亚美智造科技有限公司 | Power supply switching circuit |
| CN113168132A (en) * | 2020-06-01 | 2021-07-23 | 龚柱 | Method and device for collecting and measuring switching time of double-power-supply change-over switch contact |
| CN113922481A (en) * | 2021-09-02 | 2022-01-11 | 南通职业大学 | Multi-power-supply automatic switching protection and monitoring system |
-
2006
- 2006-12-12 CN CNU2006200531302U patent/CN200983517Y/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075000B (en) * | 2009-11-20 | 2013-03-06 | 北京国铁路阳技术有限公司 | Automatic control method for high-reliability power supply system with set of spare circuit |
| CN102393510A (en) * | 2011-09-16 | 2012-03-28 | 福建俊豪电子有限公司 | Detection system for standing power supply |
| CN103178605A (en) * | 2011-12-24 | 2013-06-26 | 苏州飞腾电器有限公司 | Power switching switch |
| CN102957200A (en) * | 2012-12-05 | 2013-03-06 | 浙江理工大学 | Method and system for managing backup power supply of underwater real-time detecting instrument |
| CN102957200B (en) * | 2012-12-05 | 2014-08-13 | 浙江理工大学 | Method and system for managing backup power supply of underwater real-time detecting instrument |
| CN103259329A (en) * | 2013-05-28 | 2013-08-21 | 南京海勇电子科技有限公司 | Direct-current multiple-power switch-over switch |
| CN103259329B (en) * | 2013-05-28 | 2016-06-29 | 南京海勇电驱动科技有限公司 | A kind of direct-current multiple-power switch-over switch |
| CN105449840A (en) * | 2016-01-16 | 2016-03-30 | 北京正丰电子科技有限公司 | An intelligent sensor using wireless charging technology and an application system thereof |
| CN107528241A (en) * | 2017-07-27 | 2017-12-29 | 杭州电力设备制造有限公司 | A kind of three pairs of cabinet spare powers and automatic switching method |
| CN107528241B (en) * | 2017-07-27 | 2024-05-28 | 杭州电力设备制造有限公司 | Three-double-cabinet spare power switching device and automatic switching method |
| CN108200702A (en) * | 2017-12-30 | 2018-06-22 | 湖南汇博电子科技股份有限公司 | Fire emergency equipment and fire emergency control method |
| CN108200702B (en) * | 2017-12-30 | 2023-09-15 | 湖南汇博电子科技股份有限公司 | Fire emergency lighting device and fire emergency lighting control method |
| CN110445247A (en) * | 2019-08-16 | 2019-11-12 | 深圳市智微智能软件开发有限公司 | High reliability redundancy electric power supply system and method |
| CN110994774A (en) * | 2019-11-11 | 2020-04-10 | 广州亚美智造科技有限公司 | Power supply switching circuit |
| CN110994774B (en) * | 2019-11-11 | 2022-03-08 | 广州亚美智造科技有限公司 | Power supply switching circuit |
| CN113168132A (en) * | 2020-06-01 | 2021-07-23 | 龚柱 | Method and device for collecting and measuring switching time of double-power-supply change-over switch contact |
| CN113168132B (en) * | 2020-06-01 | 2024-04-30 | 龚柱 | Dual-power transfer switch contact switching time acquisition and measurement method and device thereof |
| CN113922481A (en) * | 2021-09-02 | 2022-01-11 | 南通职业大学 | Multi-power-supply automatic switching protection and monitoring system |
| CN113922481B (en) * | 2021-09-02 | 2024-05-14 | 南通职业大学 | Protection and monitoring system for automatic switching of multiple power supplies |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN200983517Y (en) | Dual-power supply automatic switching device | |
| CN200950553Y (en) | Circuit apparatus for intelligent dual-power supply automatic converting switch | |
| CN205103386U (en) | High accuracy special type power supply monitoring system | |
| CN200944539Y (en) | Automatic change-over controller of double power supply | |
| CN2773762Y (en) | Monitoring protector of substation | |
| CN104901415B (en) | Dual power supply central control device | |
| CN202353306U (en) | Alternating current UPS (uninterrupted power supply) monitoring device for power | |
| CN201191712Y (en) | Low voltage AC cabinet for touching integrated intelligent transforming plant | |
| CN202121381U (en) | Intelligent operation system of variable power distribution station | |
| CN202565025U (en) | Alternating-current distribution multi-loop monitoring system | |
| CN202696279U (en) | Circuit breaker controller with dual-power changeover function and dual-power switching system | |
| CN200959533Y (en) | Controller of automatic-conversion electric appliances | |
| CN2775297Y (en) | Intelligent controller for oil field intermittent oil pumping well | |
| CN2849784Y (en) | Fast stop loop connecting structure for control power of program controller | |
| CN203350708U (en) | High-voltage frequency converter "one-driving-two" control system | |
| CN201219213Y (en) | Remote power supply switching mechanism of monitor terminal | |
| CN2278300Y (en) | Comprehensive monitoring controller for power subscriber | |
| CN201946945U (en) | Liquid crystal display intelligent control system | |
| CN201230228Y (en) | Dual power supply converting switch | |
| CN215187502U (en) | Intelligent fire-fighting emergency controller | |
| CN101154829A (en) | Method for implementing automatic switching of ring main unit standby power by FTU | |
| CN205864079U (en) | It is applicable to north latitude 41 degree and arrives the high reliability distribution terminal between north latitude 53 degree | |
| CN2854898Y (en) | Emergency power supply system of intelligent module structure | |
| CN1278468C (en) | Method for distributing DC power source and devices | |
| CN209250527U (en) | A kind of intelligent dual-purpose one is for electric machine control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071128 Termination date: 20141212 |
|
| EXPY | Termination of patent right or utility model |