CN101854062A - Automatic three-phase switching method of load - Google Patents
Automatic three-phase switching method of load Download PDFInfo
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- CN101854062A CN101854062A CN 201010214974 CN201010214974A CN101854062A CN 101854062 A CN101854062 A CN 101854062A CN 201010214974 CN201010214974 CN 201010214974 CN 201010214974 A CN201010214974 A CN 201010214974A CN 101854062 A CN101854062 A CN 101854062A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000000694 effects Effects 0.000 claims description 4
- 238000000819 phase cycle Methods 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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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
- 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
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The invention relates to an automatic three-phase switching method of load; a switch is arranged between a three-phase power supply and a single-phase load thereof; three single-phase switches which are mutually independent and are provided with interlocking devices are arranged; the power supply input ends of the three single-phase switches are respectively connected with three phase lines of the three-phase power supply correspondingly, and the power supply output ends thereof are connected in parallel to form the power supply output end of the switch; under the interlocking function of the interlocking mechanism or a circuit with an interlocking function, only one of the three single-phase switches can be disconnected/connected so as to obtain connection of a single-phase power supply and the single-phase load; when needing to conduct adjustment/balancing on the load between three-phase power supplying circuits, a path of phase line with minimum phase current is determined according to the size of the load current of each detected power supplying circuit; a certain path of the single-phase switches in a disconnected/connected state originally is switched-on/switched-off, and the single-phase switch corresponding to the phase line with the minimum phase current is disconnected/connected, so as to lead the load to be transferred to the other phase line to conduct the single-phase power supplying from the original position of the phase line, and realize the automatic adjustment of the line load in real time.
Description
Technical field
The invention belongs to change distribution field, relate in particular to a kind of method that is used for to make the alternate sharing of load equilibrium of three-phase power line.
Background technology
Make as a whole electric power system, in its three-phase power line, sharing of load equilibrium between each phase line is very to be necessary, the phase line current balance problem that this not only relates to three-phase power line also relates to the problem of all many-sides such as the economical operation that reduces line loss, electrical network and safety.Because the imbalance of electric power system three-phase load, a certain phase load is bigger than normal, and line loss is increased.Simultaneously, this phase circuit is worked under big load, both can influence the security of operation of transformer, has reduced the power supply capacity of transformer again.
So the equilibrium of phase specific electric load distributes in the three-phase power line, to economy, the safe operation of whole power distribution network, and the reliability that guarantees controller switching equipment, all be very crucial.
The electrician of power department needed to on-the-spot circuit switched when adjusting the load of each phase supply line in the past, and doing like this wastes time and energy, so the adjustment of line load often can not in time be adjusted with the variation of line load; Even adjusted, line load changes again often, so, always load adjustment can not in time be caught up with.So just cause line loss to increase, the economical operation of whole electric power system is relatively poor.
The day for announcing is on August 9th, 1989, notification number is to disclose a kind of " automatic electric limiting switching device " in the Chinese utility model patent of CN 2042640U, form by current limitation loop, program timer, delayer three parts, it is by power load that limits the user and the current supply circuit that excises super power load user automatically, reach the purpose of brownout load, but deficiencies such as initiatively regulating load is controlled afterwards, is not had in its existence.
Open day is on December 23rd, 2009, publication number is to disclose a kind of " three-phase load transfer device " in the Chinese invention patent application of CN 101609991A, it comprises: input module, the input of three-phase alternating current is provided, and the input phase sequence of this three-phase alternating current is ABC; The input measurement module judges by electric current and the voltage swing of measuring the three-phase alternating current of importing in the described input module whether three-phase load exists imbalance; The phase sequence adjusting module, for the three-phase current that described input phase sequence is ABC, adopt three independently contactor so that three kinds of output of ABC, BCA, CAB phase sequence to be provided, when described input measurement module measures three-phase load when uneven, export phase sequence and switch, otherwise by former input phase sequence output; The phase sequence display module provides three indicator lights, and a kind of in each indicator light corresponding described ABC, BCA and three kinds of output of the CAB phase sequence is in order to show current output phase sequence; And output module, will export to load through the three-phase alternating current after described phase sequence adjusting module is adjusted phase sequence.It is integrally-regulated that but it exists whole device only to be suitable for three-phase power line, and whole apparatus structure is too loaded down with trivial details, the more high deficiency of deployment cost.
Summary of the invention
Technical problem to be solved by this invention provides the method that a kind of three-phase of loading automaticallyes switch, it can be between the three phase mains of supply line, the phase sequence at a certain uniline of adjusting/switching automatically place, whole switching device shifter is simple for structure, reliable in action, economical and practical, can realize the switching of a certain single-phase load between each phase line of three-phase power line smoothly, so that remote operation realizes that automatically the equilibrium of each alternate load distributes.
Technical scheme of the present invention is: the method that provides a kind of three-phase of loading to automatically switch, comprise a three phase mains and a single-phase load, and it is characterized in that:
Between described three phase mains and single-phase load, be provided with one and switch switch;
Be provided with three single-phase switchs separate, that have interlock in the described diverter switch;
The power input of three single-phase switchs respectively with the corresponding connection of three phase lines of three phase mains, constitute the three-phase power input end of described diverter switch;
Described three single-phase switchs under the interlocking effect of described mutual interlocking gear or interlock function circuit, at any one time, all have only the single-phase switch can closure/connection, and all the other two single-phase switchs all are in to be opened/off-state;
The power output end parallel connection of three single-phase switchs constitutes the power output end of described diverter switch;
Described single-phase load is connected with the power output end of described diverter switch, through and only be connected with a certain phase line in the three phase mains through any one single-phase switch, from described three phase mains, obtain single phase poaer supply;
During the adjusting of carrying out loading between the three-phase power line when needs/equilibrium,, determine one tunnel phase line of phase current minimum according to the size of detected each phase supply line load current;
Open/disconnect a certain road single-phase switch that was in closure/on-state originally, the pairing single-phase switch of phase line of closure/connection and described phase current minimum, make the phase line of described single-phase load by original place, transfer to another phase phase line and carry out single phase power supply, realize the automatic adjustment of line load by this, and make the adjustment of line load realize instantaneity.
Wherein, described single-phase switch is the electromagnetic type single-phase switch, and described three single-phase switchs are arranged side by side in the housing of diverter switch.
" closure/connection " of described single-phase switch or " opening/disconnect " operation can local operation, also can be undertaken by Remote.
Described interlock is mechanical interlocked mechanism or interlock function circuit.
Described mechanical interlocked mechanism or interlock function circuit are guaranteed when a certain road single-phase switch need carry out " closure/connection " operation, at first all the other two-way single-phase switchs are carried out " opening/disconnect " operation, make at any one time, have only one the tunnel to be in " closure/connection " state in described three single-phase switchs.
Determining of its described each phase supply line load current size can be realized by the comparing function circuit on the spot; Perhaps, will be through the load current value teletransmission of each phase supply line of measuring to centralized-control center/controlling platform, by computer, industrial computer or single-chip microcomputer functional module, realize the comparison and the selection mutually of minimum load current place of each phase supply line load current size; Then, send the adjusting/equilibrium instruction of loading between the three-phase power line by centralized-control center/controlling platform, output needle is to " closure/connection " operating control signal of a certain single-phase switch.
" closure/connection " operating control signal of the load current value of its described each phase supply line and/or a certain single-phase switch transmits by wired or wireless network.
Compared with the prior art, the advantage of the technical program is:
1. according to the variation of line load electric current, control the closure of one of them single-phase switch, load is switched on other phase lines, again binding data teletransmission and telecontrol engineering, solved the automation issues that line load is adjusted, and made the adjustment of line load realize instantaneity;
2. whole switching device shifter is simple for structure, and reliable in action is economical and practical;
3. can realize the switching of a certain single-phase load between each phase line of three-phase power line smoothly, so that remote operation realizes that automatically the equilibrium of each alternate load distributes.
Description of drawings
Fig. 1 is a control method block diagram of the present invention;
Fig. 2 is a main loop circuit structural representation of the present invention.
1 is diverter switch among the figure, and 2 is single-phase switch, and 3 is the three-phase power input end of diverter switch, and 4 is the power output end of diverter switch.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Among Fig. 1, the method that technical solution of the present invention provides a kind of three-phase of loading to automatically switch comprises a three phase mains and a single-phase load, and its concrete grammar/step is:
Between described three phase mains and single-phase load, be provided with one and switch switch;
Be provided with three single-phase switchs separate, that have interlock in the described diverter switch;
The power input of three single-phase switchs respectively with the corresponding connection of three phase lines of three phase mains, constitute the three-phase power input end of described diverter switch;
The power output end parallel connection of three single-phase switchs constitutes the power output end of described diverter switch;
Described single-phase load is connected with the power output end of described diverter switch, through and only be connected with a certain phase line in the three phase mains through any one single-phase switch, from described three phase mains, obtain single phase poaer supply;
During the adjusting of carrying out loading between the three-phase power line when needs/equilibrium,, determine one tunnel phase line of phase current minimum according to the size of detected each phase supply line load current;
Open/disconnect a certain road single-phase switch that was in closure/on-state originally, the pairing single-phase switch of phase line of closure/connection and described phase current minimum, make the phase line of described single-phase load by original place, transfer to another phase phase line and carry out single phase power supply, realize the automatic adjustment of line load by this, and make the adjustment of line load realize instantaneity.
Described three single-phase switchs under the interlocking effect of mechanical interlocked mechanism or interlock function circuit, at any one time, all have only the single-phase switch can closure/connection, and all the other two single-phase switchs all are in to be opened/off-state.
" closure/connection " of described single-phase switch or " opening/disconnect " operation can local operation, also can be undertaken by Remote.
Described interlock is mechanical interlocked mechanism or interlock function circuit.
Determining of its described each phase supply line load current size can be realized by the comparing function circuit on the spot; Perhaps, will be through the load current value teletransmission of each phase supply line of measuring to centralized-control center/controlling platform, by computer, industrial computer or single-chip microcomputer functional module, realize the comparison and the selection mutually of minimum load current place of each phase supply line load current size; Then, send the adjusting/equilibrium instruction of loading between the three-phase power line by centralized-control center/controlling platform, output needle is to " closure/connection " operating control signal of a certain single-phase switch.
" closure/connection " operating control signal of the load current value of its described each phase supply line and/or a certain single-phase switch transmits by wired or wireless network.
Because above-mentioned electromagnetic type single-phase switch, mechanical interlocked mechanism or interlock function circuit, comparing function circuit is prior art and commercially available prod, the comparison of each phase supply line load current size all can obtain by storage, comparison and the output of data with the selection mutually of minimum load current place, so the concrete structure of the said goods and mode, operation principle, connected mode and Program Realizing Method are no longer narrated at this.
Among Fig. 2, single-phase switch 2 is the electromagnetic type single-phase switch, and three single-phase switchs are arranged side by side in the housing of diverter switch 1.
The power input of its three single-phase switchs respectively with the corresponding connection of three phase lines of three phase mains, constitute the three-phase power input end 3 of described diverter switch.
The power output end parallel connection of three single-phase switchs constitutes the power output end 4 of described diverter switch.
Three single-phase switchs under the interlocking effect of mutual interlocking gear or interlock function circuit, at any one time, all have only the single-phase switch can closure/connection, and all the other two single-phase switchs all are in to be opened/off-state.
Above-mentioned mechanical interlocked mechanism or interlock function circuit are guaranteed when a certain road single-phase switch need carry out " closure/connection " operation, at first all the other two-way single-phase switchs are carried out " opening/disconnect " operation, make at any one time, have only one the tunnel to be in " closure/connection " state in described three single-phase switchs.
Then the single-phase load (not shown) is connected with the power output end of diverter switch, through and only be connected with a certain phase line in the three phase mains through any one single-phase switch, from described three phase mains, obtain single phase poaer supply.
Because technical scheme of the present invention is according to the variation of line load electric current, control the closure of one of them single-phase switch, in time/automatically load is switched on other phase lines, binding data teletransmission and telecontrol engineering have solved the automation issues that line load is adjusted again; Whole switching device shifter is simple for structure, and reliable in action is economical and practical;
The technical program can realize the switching of a certain single-phase load between each phase line of three-phase power line smoothly, so that remote operation realizes that automatically the equilibrium of each alternate load distributes.
The present invention can be widely used in low-voltage power supply and power network operation field.
Claims (6)
1. the method that the three-phase of loading automaticallyes switch comprises a three phase mains and a single-phase load, it is characterized in that:
Between described three phase mains and single-phase load, be provided with one and switch switch;
Be provided with three single-phase switchs separate, that have interlock in the described diverter switch;
The power input of three single-phase switchs respectively with the corresponding connection of three phase lines of three phase mains, constitute the three-phase power input end of described diverter switch;
Described three single-phase switchs under the interlocking effect of described mutual interlocking gear or interlock function circuit, at any one time, all have only the single-phase switch can closure/connection, and all the other two single-phase switchs all are in to be opened/off-state;
The power output end parallel connection of three single-phase switchs constitutes the power output end of described diverter switch;
Described single-phase load is connected with the power output end of described diverter switch, through and only be connected with a certain phase line in the three phase mains through any one single-phase switch, from described three phase mains, obtain single phase poaer supply;
During the adjusting of carrying out loading between the three-phase power line when needs/equilibrium,, determine one tunnel phase line of phase current minimum according to the size of detected each phase supply line load current;
Open/disconnect a certain road single-phase switch that was in closure/on-state originally, the pairing single-phase switch of phase line of closure/connection and described phase current minimum, make the phase line of described single-phase load by original place, transfer to another phase phase line and carry out single phase power supply, realize the automatic adjustment of line load by this, and make the adjustment of line load realize instantaneity.
2. the method that automaticallyes switch according to the described load three-phase of claim 1 is characterized in that described single-phase switch is the electromagnetic type single-phase switch, and described three single-phase switchs are arranged side by side in the housing of diverter switch.
3. the method that automaticallyes switch according to the described load three-phase of claim 1, " closure/connection " or " opening/disconnect " that it is characterized in that described single-phase switch are operated can local operation, also can be undertaken by Remote.
4. the method that automaticallyes switch according to the described load three-phase of claim 1, it is characterized in that described interlock is mechanical interlocked mechanism or interlock function circuit, described mechanical interlocked mechanism or interlock function circuit are guaranteed when a certain road single-phase switch need carry out " closure/connection " operation, at first all the other two-way single-phase switchs are carried out " opening/disconnect " operation, make at any one time, have only one the tunnel to be in " closure/connection " state in described three single-phase switchs.
5. the method that automaticallyes switch according to the described load three-phase of claim 1 is characterized in that determining of described each phase supply line load current size, can be realized by the comparing function circuit on the spot; Perhaps, will be through the load current value teletransmission of each phase supply line of measuring to centralized-control center/controlling platform, by computer, industrial computer or single-chip microcomputer functional module, realize the comparison and the selection mutually of minimum load current place of each phase supply line load current size; Then, send the adjusting/equilibrium instruction of loading between the three-phase power line by centralized-control center/controlling platform, output needle is to " closure/connection " operating control signal of a certain single-phase switch.
6. the method that automaticallyes switch according to claim 1 or 5 described load three-phases is characterized in that the load current value of described each phase supply line and/or " closure/connection " operating control signal of a certain single-phase switch, transmits by wired or wireless network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010214974 CN101854062B (en) | 2010-07-01 | 2010-07-01 | Automatic three-phase switching method of load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010214974 CN101854062B (en) | 2010-07-01 | 2010-07-01 | Automatic three-phase switching method of load |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101854062A true CN101854062A (en) | 2010-10-06 |
| CN101854062B CN101854062B (en) | 2013-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010214974 Expired - Fee Related CN101854062B (en) | 2010-07-01 | 2010-07-01 | Automatic three-phase switching method of load |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522760A (en) * | 2011-12-03 | 2012-06-27 | 山东卓尔电气有限公司 | Method for switching phase lines of three-phase circuit and capable of preventing inter-phase short-circuit and phase change switch device |
| FR2970124A1 (en) * | 2011-01-04 | 2012-07-06 | Bnext Energy | Device for connecting single-phase electrical equipment on high power three-phase electrical installation used in e.g. industry, has control module selecting phase of installation based on power of equipment and controlling switching module |
| CN103368150A (en) * | 2012-03-27 | 2013-10-23 | 苏州工业园区新宏博通讯科技有限公司 | Three-phase power switching interlocking protection circuit |
| EP2672603A1 (en) * | 2012-06-06 | 2013-12-11 | ABB Technology AG | A device for connecting a single-phase device into a multiphase electric network |
| CN103997051A (en) * | 2014-06-10 | 2014-08-20 | 长沙高升电子电器科技有限公司 | Online automatic power distribution method and device |
| CN108092286A (en) * | 2018-01-19 | 2018-05-29 | 山东卓尔电气有限公司 | A kind of relay system phase-change switch for preventing installation short circuit |
| CN108110777A (en) * | 2018-02-13 | 2018-06-01 | 北京英博电气股份有限公司 | A kind of three-phase imbalance regulating device and system |
| CN109950917A (en) * | 2019-03-27 | 2019-06-28 | 山东正瑞电子有限公司 | The self balancing electric meter data collecting system of three-phase load and selection switch |
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| JPH08265980A (en) * | 1995-03-24 | 1996-10-11 | Ngk Insulators Ltd | Phase switcher for high voltage distribution line |
| JP2006025503A (en) * | 2004-07-06 | 2006-01-26 | Chugoku Electric Power Co Inc:The | By-quality control system for power-supply, and method of power supplying to single-phase load by quality |
| CN2899232Y (en) * | 2006-03-23 | 2007-05-09 | 江苏省电力公司南京供电公司 | Loss-descending loading economical phase adjuster |
| CN101013816A (en) * | 2007-01-29 | 2007-08-08 | 贾书洪 | Power intelligent seamless three-phase leveling system |
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2010
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08265980A (en) * | 1995-03-24 | 1996-10-11 | Ngk Insulators Ltd | Phase switcher for high voltage distribution line |
| JP2006025503A (en) * | 2004-07-06 | 2006-01-26 | Chugoku Electric Power Co Inc:The | By-quality control system for power-supply, and method of power supplying to single-phase load by quality |
| CN2899232Y (en) * | 2006-03-23 | 2007-05-09 | 江苏省电力公司南京供电公司 | Loss-descending loading economical phase adjuster |
| CN101013816A (en) * | 2007-01-29 | 2007-08-08 | 贾书洪 | Power intelligent seamless three-phase leveling system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2970124A1 (en) * | 2011-01-04 | 2012-07-06 | Bnext Energy | Device for connecting single-phase electrical equipment on high power three-phase electrical installation used in e.g. industry, has control module selecting phase of installation based on power of equipment and controlling switching module |
| CN102522760A (en) * | 2011-12-03 | 2012-06-27 | 山东卓尔电气有限公司 | Method for switching phase lines of three-phase circuit and capable of preventing inter-phase short-circuit and phase change switch device |
| CN103368150A (en) * | 2012-03-27 | 2013-10-23 | 苏州工业园区新宏博通讯科技有限公司 | Three-phase power switching interlocking protection circuit |
| CN103368150B (en) * | 2012-03-27 | 2015-12-09 | 苏州新宏博智能科技股份有限公司 | Three-phase electricity switches interlock protection circuit |
| EP2672603A1 (en) * | 2012-06-06 | 2013-12-11 | ABB Technology AG | A device for connecting a single-phase device into a multiphase electric network |
| CN103997051A (en) * | 2014-06-10 | 2014-08-20 | 长沙高升电子电器科技有限公司 | Online automatic power distribution method and device |
| CN108092286A (en) * | 2018-01-19 | 2018-05-29 | 山东卓尔电气有限公司 | A kind of relay system phase-change switch for preventing installation short circuit |
| CN108110777A (en) * | 2018-02-13 | 2018-06-01 | 北京英博电气股份有限公司 | A kind of three-phase imbalance regulating device and system |
| CN109950917A (en) * | 2019-03-27 | 2019-06-28 | 山东正瑞电子有限公司 | The self balancing electric meter data collecting system of three-phase load and selection switch |
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| Publication number | Publication date |
|---|---|
| CN101854062B (en) | 2013-03-06 |
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Owner name: STATE GRID FUJIAN JINJIANG POWER SUPPLY CO., LTD. Effective date: 20141105 |
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Effective date of registration: 20141105 Address after: 522, room 255086, block A, hi tech Pioneer Park, 135 hi tech Development Zone, Shandong, Zibo Patentee after: Shandong Zhuo'er Electric Co., Ltd. Patentee after: STATE GRID FUJIAN JINJIANG POWER SUPPLY CO., LTD. Address before: 522, room 255086, block A, hi tech Pioneer Park, 135 hi tech Development Zone, Shandong, Zibo Patentee before: Shandong Zhuo'er Electric Co., Ltd. |
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Effective date of registration: 20151125 Address after: 522, room 255086, block A, hi tech Pioneer Park, 135 hi tech Development Zone, Shandong, Zibo Patentee after: Shandong Zhuo'er Electric Co., Ltd. Address before: 522, room 255086, block A, hi tech Pioneer Park, 135 hi tech Development Zone, Shandong, Zibo Patentee before: Shandong Zhuo'er Electric Co., Ltd. Patentee before: STATE GRID FUJIAN JINJIANG POWER SUPPLY CO., LTD. |
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Application publication date: 20101006 Assignee: Nanjing Jinchao Electric Technology Co., Ltd Assignor: Shandong Zhuo'er Electric Co., Ltd. Contract record no.: X2020370000002 Denomination of invention: Automatic three-phase switching method of load Granted publication date: 20130306 License type: Common License Record date: 20200212 Application publication date: 20101006 Assignee: Yueqing Qianlong electric switch Co., Ltd Assignor: Shandong Zhuo'er Electric Co., Ltd. Contract record no.: X2020370000006 Denomination of invention: Automatic three-phase switching method of load Granted publication date: 20130306 License type: Common License Record date: 20200212 |
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