CN202395514U - Dual-power switching device - Google Patents

Dual-power switching device Download PDF

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Publication number
CN202395514U
CN202395514U CN2011204692836U CN201120469283U CN202395514U CN 202395514 U CN202395514 U CN 202395514U CN 2011204692836 U CN2011204692836 U CN 2011204692836U CN 201120469283 U CN201120469283 U CN 201120469283U CN 202395514 U CN202395514 U CN 202395514U
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contactor
series
power supply
line
output line
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栾兆静
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Shanghai Liancheng Group Co Ltd
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Shanghai Liancheng Group Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems 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
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems

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Abstract

一种双电源转换装置,主电源控制电路中第一接触器主触点置于主电源输出线与负载电网之间,并在主电源与主触点间的输出线上分别连接中间继电器线圈回路;第一接触器线圈、中间继电器常开触点、第二接触器常闭触点串联连接回路;指示灯和第一接触器常开触点串联连接回路。备用电源控制电路中第二接触器主触点置于备用电源输出线与负载电网之间,并在备用电源与主触点间的输出线上分别连接第二接触器线圈、第一接触器常闭触点、中间继电器常闭触点串联连接回路;指示灯和第二接触器常开触点串联连接回路。本实用新型结构简单,安全可靠,操作方便,不会因误操作而导致事故,如遇电路故障,能够快速检测出故障原因,大大缩短了维护修理的时间行。

Figure 201120469283

A dual power conversion device, the main contact of the first contactor in the main power control circuit is placed between the output line of the main power supply and the load grid, and the output lines between the main power supply and the main contacts are respectively connected to the intermediate relay coil circuit ; The coil of the first contactor, the normally open contact of the intermediate relay, and the normally closed contact of the second contactor are connected in series; the indicator light and the normally open contact of the first contactor are connected in series. In the backup power supply control circuit, the main contact of the second contactor is placed between the output line of the backup power supply and the load grid, and the output line between the backup power supply and the main contact is respectively connected to the coil of the second contactor and the normal contactor of the first contactor. The closed contact and the normally closed contact of the intermediate relay are connected in series; the indicator light and the normally open contact of the second contactor are connected in series. The utility model has the advantages of simple structure, safety and reliability, and convenient operation, and will not cause accidents due to misoperation. In case of circuit failure, the cause of the failure can be quickly detected, and the time for maintenance and repair is greatly shortened.

Figure 201120469283

Description

A kind of double-power supply switching device
Technical field
The utility model relates to the conversion equipment that is used between three-phase alternating-current supply, especially double-power supply switching device.
Background technology
Along with the develop rapidly of Chinese national economy, earth-shaking variation has all taken place in social all trades and professions.Need from safety in production and quantity-produced, all there have been very high requirement in many industries and department to power supply quality.The fire fighting monitoring of skyscraper, the illumination of hospital operating room, airdrome lighting, important production line or the like will bring immeasurable loss if having a power failure midway, and in this case, it is considerable that a stand-by power supply is arranged.When mains power failure, can switch to stand-by power supply and use.
Yet duplicate supply controller of the prior art but has a lot of places unsatisfactory, in practical application, usually mains power failure can occur, the situation that stand-by power supply but can not drop into.Even if keep in repair and change the time that the duplicate supply controller also often need interrupt the power supply several hrs at once, bring very big inconvenience to the user, and can not allow especially at some special occasions.
Summary of the invention
The utility model technical issues that need to address are to overcome defective in the prior art; Provide a kind of simple in structure, performance is safe and reliable, with low cost, be easy to processing or change, can not influence the duplicate supply control transformation device that stand-by power supply is supplied power because of mains power failure.
The utility model has adopted following technical proposal to solve its technical problem: a kind of double-power supply switching device; Comprise three-phase alternating current main power source output line and three-phase alternating current stand-by power supply output line; Separately phase line, zero line is docked with corresponding phase line, zero line on the load electrical network in main power source output line and the stand-by power supply output line, it is characterized in that:
Be equipped with the main power source control circuit on the main power source output line, be equipped with the stand-by power supply control circuit on the stand-by power supply output line,
Described main power source control circuit comprises first A.C. contactor and auxiliary relay; Three utmost point main contactss of this first A.C. contactor place on the main power source output line between main power source and the load electrical network, on the main power source output line between main power source and three utmost point main contactss, are connected respectively
An auxiliary relay coil working loop;
A loop that is connected in series by first ac contactor coil, auxiliary relay normally opened contact, the second A.C. contactor normally-closed contact;
And loop that is connected in series by the indicator light and the first A.C. contactor normally opened contact;
Described stand-by power supply control circuit comprises second A.C. contactor; Three utmost point main contactss of this second A.C. contactor place on the stand-by power supply output line between stand-by power supply and the load electrical network, on the stand-by power supply output line between stand-by power supply and three utmost point main contactss, are connected respectively
A loop that is connected in series by second ac contactor coil, the first A.C. contactor normally-closed contact, auxiliary relay normally-closed contact;
And loop that is connected in series by the indicator light and the second A.C. contactor normally opened contact.
The utility model respectively adds an A.C. contactor in main power source output line and stand-by power supply output line circuit; And it is ingenious and the position of main contacts, normally closed, normally opened contact rationally is set; Make it to form respectively main power source control circuit and stand-by power supply control circuit, the on-off switch of security control main power source and stand-by power supply output line.On main power source output line and stand-by power supply output line, circuit breaker is set, to increase the reliability of outlet line, the fuse of having connected respectively in each control circuit is so that promote the fail safe of circuit more.
The beneficial effect of the utility model:
1, the utility model also has the open-phase protection effect except having conventional decompression, under-voltage, overcurrent and short-circuit protection.
2, the utility model circuit structure is simple, and is safe and reliable, easy to operate, can not cause power supply switching accident because of misoperation.
3, the used components and parts of the utility model circuit are common components and parts, change simply, and fault detect is convenient, produces if any fault, and the reason that can fast detecting be out of order has shortened time of maintenance and repair circuit greatly.
4, there are not capacitor and other to be subject to the non-linear element that high order harmonic component is disturbed in the utility model circuit, can stable operation in the electric power system of high order harmonic component serious interference.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams.
Each literal or numerical chracter among its figure are expressed as respectively:
1-three-phase alternating current main power source output line (wherein: A-first phase line, B-second phase line, C-third phase line, N-zero line);
2-main power source control circuit;
3-three-phase alternating current stand-by power supply output line (wherein: A '-first phase line, B '-second phase line, C '-third phase line, N-zero line);
4-stand-by power supply control circuit;
5-load electrical network (wherein: L1, L2, L3-phase line; The N-zero line);
KM01-first ac contactor coil; Three utmost point main contactss of KM01-0-first A.C. contactor; The KM01-1-first A.C. contactor normally opened contact; The KM01-2-first A.C. contactor normally-closed contact;
KM02-second ac contactor coil; Three utmost point main contactss of KM02-0-second A.C. contactor; The KM02-1-second A.C. contactor normally-closed contact; The KM02-2-second A.C. contactor normally opened contact;
KA01-auxiliary relay coil; KA01-1-auxiliary relay normally opened contact; KA01-2-auxiliary relay normally-closed contact;
HL01~HL04-indicator light;
FU01~FU06-fuse;
SA01~SA02-change over switch;
QF01~QF02-lead-in circuit breaker.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is done further to describe.
With reference to accompanying drawing, the utility model comprises three-phase alternating current main power source output line 1 and three-phase alternating-current supply output line 3.The first phase line A in the main power source output line 1, the second phase line B, third phase line C and zero line N correspondence are docked with phase line L1, L2, L3 and the zero line N on the load electrical network 5; The first phase line A ' in the stand-by power supply output line 3, the second phase line B ', third phase line C ' and zero line N also correspondence are docked with phase line L1, L2, L3 and the zero line N on the load electrical network 5.
The utility model is equipped with main power source control circuit 2 on main power source output line 1, be equipped with stand-by power supply control circuit 4 on the stand-by power supply output line 3.
The described main power source control circuit 2 of the utility model comprises first A.C. contactor and auxiliary relay.Three utmost point main contacts KM01-0 of this first A.C. contactor place on the main power source output line 1 between main power source and the load electrical network 5.
The described main power source control circuit 2 of the utility model is connected the work loop of an auxiliary relay coil KA01 on the main power source output line 1 between main power source and three utmost point main contacts KM01-0.Particularly, this work loop is connected on the first phase line A and third phase C line of main power source output line 1.Auxiliary relay coil KA01 two ends in this work loop also be connected in series respectively two fuse F U02, FU03.
The described main power source control circuit 2 of the utility model also is connected a loop that is connected in series by the first ac contactor coil KM01, auxiliary relay normally opened contact KA01-1, the second A.C. contactor normally-closed contact KM02-1 on the main power source output line 1 between main power source and three utmost point main contacts KM01-0.Particularly, this loop is connected on the second phase line B and zero line N of main power source output line 1.An end that connects the second phase line B in this loop also be connected in series respectively a fuse F U04 and a change over switch SA01.
The described main power source control circuit 2 of the utility model also is connected a loop that is connected in series by the indicator light HL02 and the first A.C. contactor normally opened contact KM01-1 on the main power source output line 1 between main power source and three utmost point main contacts KM01-0, form main power source working condition indication loop.Particularly, this loop is connected on the second phase line B and zero line N of main power source output line 1.When being connected in series fuse F U04 and change over switch SA01 in the loop at first ac contactor coil KM01 place; The be connected in series end in loop of the indicator light HL02 and the first A.C. contactor normally opened contact KM01-1 can be connected on the node between fuse F U04 and the change over switch SA01, and the other end connects zero line N.
The described stand-by power supply control circuit 4 of the utility model comprises second A.C. contactor, and three utmost point main contacts KM02-0 of this second A.C. contactor place on the stand-by power supply output line 3 between stand-by power supply and the load electrical network 5.
The described stand-by power supply control circuit 4 of the utility model is connected a loop that is connected in series by the second ac contactor coil KM02, the first A.C. contactor normally-closed contact KM01-2, auxiliary relay normally-closed contact KA01-2 on the stand-by power supply output line 3 between stand-by power supply and three utmost point main contacts KM02-0.Particularly, this loop is connected on the second phase line B ' and zero line N of stand-by power supply output line 3.An end that connects the second phase line B ' in this loop also be connected in series respectively a fuse F U06 and a change over switch SA02.
The described stand-by power supply control circuit 4 of the utility model is connected a loop that is connected in series by the indicator light HL04 and the second A.C. contactor normally opened contact KM02-2 on the stand-by power supply output line 3 between stand-by power supply and three utmost point main contacts KM02-0, form stand-by power supply working condition indication loop.Particularly, this loop is connected on the second phase line B ' and zero line N of stand-by power supply output line 3.When being connected in series fuse F U06 and change over switch SA02 in the loop at second ac contactor coil KM02 place; The be connected in series end in loop of the indicator light HL04 and the second A.C. contactor normally opened contact KM02-2 is connected on the node between fuse HL04 and the change over switch SA02, and the other end connects zero line N.
The utility model also is equipped with lead-in circuit breaker QF01 on described three-phase alternating current main power source output line 1, when maintenance, can play the power-off protection effect.In addition, plug into after fuse F U01 and indicator light HL01 are connected in series between the first phase line A and zero line N on the main power source output line 1, form main power source state indication loop.
On described three-phase alternating current stand-by power supply output line 3, also be equipped with lead-in circuit breaker QF02, when maintenance, can play the power-off protection effect.In addition, plug into after fuse F U05 and indicator light HL03 are connected in series between the third phase line C ' and zero line N on the stand-by power supply output line 3, form stand-by power supply state indication loop.
Below basic status and principle during the work of summary the utility model:
During the utility model operate as normal, lead-in circuit breaker QF01 on the three-phase alternating current main power source output line 1 and the change over switch SA01 in the main power source control circuit 2 are in closure state; Lead-in circuit breaker QF02 on the three-phase alternating current stand-by power supply output line 3 and the change over switch SA02 in the stand-by power supply control circuit 4 also are in closure state.
When main power source normally uses; On the three-phase alternating current main power source output line 1; Indicator light HL01 lights, and expression main power source output line 1 has electricity, auxiliary relay coil KA01 energising; Its normally opened contact KA01-1 in main power source control circuit 2 is closed, and the normally-closed contact KA01-2 in stand-by power supply control circuit 4 opens; Simultaneously three-phase alternating current stand-by power supply output line 3 also; Indicator light HL03 lights, and expression stand-by power supply output line 3 has electricity, but owing to the auxiliary relay normally-closed contact KA01-2 in the second ac contactor coil KM02 loop is opened; So the second ac contactor coil KM02 must not; Normally-closed contact KM02-1 in its main power source control circuit 2 still remains closed normality, first ac contactor coil KM01 loop energising this moment, and this contactor coil KM01 gets electric back adhesive three utmost point main contacts KM01-0; Thereby cause main power source output line 1 to connect load electrical network 5, main power source is to 5 power supplies of load electrical network.This moment, the first A.C. contactor normally opened contact KM01-1 was closed in addition, and indicator light HL02 lights, and the operating state that the expression main power source is inserted is normal.
When the main power source abnormal power-down; Three-phase alternating current main power source output line 1 dead electricity; The HL01 indicator light extinguishes, and its normally opened contact KA01-1 and normally-closed contact KA01-2 recover often to open and normally closed normality after the auxiliary relay coil KA01 dead electricity in main power source control circuit 2, at this moment the first ac contactor coil KM01 loop dead electricity; Make its three utmost points main contacts KM01-0 break off being connected of main power source output line 1 and load electrical network after this contactor coil KM01 dead electricity; Its normally opened contact KM01-1 and normally-closed contact KM01-2 recover often to open and normally closed normality, and the HL02 indicator light extinguishes, and the expression main power source gets into off-state; Simultaneously; The loop energising at the second ac contactor coil KM02 place in stand-by power supply control circuit 4, this contactor coil KM02 gets electric its three utmost points main contacts of back adhesive KM02-0, makes stand-by power supply output line 3 connect load electrical network 5; Thereby cause stand-by power supply to 5 power supplies of load electrical network; Meanwhile, the second A.C. contactor normally opened contact KM02-2 in the stand-by power supply control circuit 4 is closed, and indicator light HL04 lights; The operating state that the expression stand-by power supply is inserted is normal, and so far whole duplicate supply transfer process finishes.

Claims (9)

1.一种双电源转换装置,包括三相交流主电源输出线和三相交流备用电源输出线,该主电源输出线和备用电源输出线中各自的相线、零线接驳于负载电网上相对应的相线、零线,其特征在于: 1. A dual power conversion device, comprising a three-phase AC main power output line and a three-phase AC backup power output line, the respective phase lines and neutral lines of the main power output line and the backup power output line are connected to the load grid The corresponding phase line and neutral line are characterized by: 主电源输出线上置有主电源控制电路,备用电源输出线上置有备用电源控制电路, The main power output line is equipped with a main power control circuit, and the backup power output line is equipped with a backup power control circuit. 所述的主电源控制电路包括第一交流接触器和中间继电器,该第一交流接触器的三极主触点置于主电源与负载电网之间的主电源输出线上,在主电源与三极主触点之间的主电源输出线上分别连接 The main power supply control circuit includes a first AC contactor and an intermediate relay. The three-pole main contact of the first AC contactor is placed on the main power output line between the main power supply and the load grid. The main power output lines between the pole main contacts are connected separately 一个中间继电器线圈工作回路; An intermediate relay coil working circuit; 一个由第一交流接触器线圈、中间继电器常开触点、第二交流接触器常闭触点串联连接的回路; A circuit connected in series by the coil of the first AC contactor, the normally open contact of the intermediate relay, and the normally closed contact of the second AC contactor; 以及一个由指示灯和第一交流接触器常开触点串联连接的回路; and a circuit connected in series by the indicator light and the normally open contact of the first AC contactor; 所述的备用电源控制电路包括第二交流接触器,该第二交流接触器的三极主触点置于备用电源与负载电网之间的备用电源输出线上,在备用电源与三极主触点之间的备用电源输出线上分别连接 The backup power supply control circuit includes a second AC contactor, the three-pole main contact of the second AC contactor is placed on the backup power output line between the backup power supply and the load grid, between the backup power supply and the three-pole main contact Points are connected separately between the standby power output lines 一个由第二交流接触器线圈、第一交流接触器常闭触点、中间继电器常闭触点串联连接的回路; A circuit connected in series by the coil of the second AC contactor, the normally closed contact of the first AC contactor, and the normally closed contact of the intermediate relay; 以及一个由指示灯和第二交流接触器常开触点串联连接的回路。 And a circuit connected in series by the indicator light and the normally open contact of the second AC contactor. 2.根据权利要求1所述的一种双电源转换装置,其特征在于:所述的中间继电器线圈工作回路连接在主电源输出线的第一相线和第三相线上。 2. A dual power conversion device according to claim 1, characterized in that: said intermediate relay coil working circuit is connected to the first phase line and the third phase line of the output line of the main power supply. 3.根据权利要求1所述的一种双电源转换装置,其特征在于:所述的由第一交流接触器线圈、中间继电器常开触点、第二交流接触器常闭触点串联连接的回路连接在主电源输出线的第二相线和零线上,由指示灯和第一交流接触器常开触点串联连接的回路也连接在主电源输出线的第二相线和零线上。 3. A dual power conversion device according to claim 1, characterized in that: the coil connected in series by the coil of the first AC contactor, the normally open contact of the intermediate relay, and the normally closed contact of the second AC contactor The loop is connected to the second phase line and neutral line of the main power output line, and the loop connected in series by the indicator light and the normally open contact of the first AC contactor is also connected to the second phase line and neutral line of the main power output line . 4.根据权利要求1所述的一种双电源转换装置,其特征在于:所述的由第二交流接触器线圈、第一交流接触器常闭触点、中间继电器常闭触点串联连接的回路连接在备用电源输出线的第二相线和零线上,由指示灯和第二交流接触器常开触点串联连接的回路也连接在备用电源输出线的第二相线和零线上。 4. A dual power supply conversion device according to claim 1, characterized in that: said second AC contactor coil, the first AC contactor normally closed contact, and the intermediate relay normally closed contact are connected in series The loop is connected to the second phase line and the neutral line of the output line of the backup power supply, and the loop connected in series by the indicator light and the normally open contact of the second AC contactor is also connected to the second phase line and the neutral line of the output line of the backup power supply . 5.根据权利要求1所述的一种双电源转换装置,其特征在于:所述的中间继电器线圈工作回路中的中间继电器线圈两端分别串联连接两熔断器。 5 . The dual power conversion device according to claim 1 , wherein two fuses are connected in series at both ends of the intermediate relay coil in the intermediate relay coil working circuit. 5 . 6.根据权利要求1所述的一种双电源转换装置,其特征在于:所述的由第一交流接触器线圈、中间继电器常开触点、第二交流接触器常闭触点串联连接回路中连接相线的一端还分别串联连接一个熔断器和一个转换开关,指示灯和第一交流接触器常开触点串联连接回路的一端连接在熔断器和转换开关之间,另一端连接零线。 6. A dual power conversion device according to claim 1, characterized in that: the circuit is connected in series by the coil of the first AC contactor, the normally open contact of the intermediate relay, and the normally closed contact of the second AC contactor One end connected to the phase line is also connected in series with a fuse and a transfer switch, and the indicator light and the first AC contactor normally open contact are connected in series. One end of the circuit is connected between the fuse and the transfer switch, and the other end is connected to the neutral line . 7.根据权利要求1所述的一种双电源转换装置,其特征在于:所述的由第二交流接触器线圈、第一交流接触器常闭触点、中间继电器常闭触点串联连接的回路中连接相线的一端还分别串联连接一个熔断器和一个转换开关,指示灯和第二交流接触器常开触点串联连接回路的一端连接在熔断器和转换开关之间,另一端连接零线。 7. A dual power supply conversion device according to claim 1, characterized in that: said second AC contactor coil, the first AC contactor normally closed contact, and the intermediate relay normally closed contact are connected in series One end of the circuit connected to the phase line is also connected in series with a fuse and a transfer switch, and the indicator light and the second AC contactor are connected in series. One end of the circuit is connected between the fuse and the transfer switch, and the other end is connected to zero. Wire. 8.根据权利要求1所述的一种双电源转换装置,其特征在于:所述的三相交流主电源输出线上还置有进线断路器,以及由熔断器和指示灯串联连接后接驳在相、零线之间的回路。 8. A dual power conversion device according to claim 1, characterized in that: the output line of the three-phase AC main power supply is also provided with an incoming circuit breaker, and is connected in series by a fuse and an indicator light. The circuit between the phase and neutral wires. 9.根据权利要求1所述的一种双电源转换装置,其特征在于:所述的三相交流备用电源输出线上还置有进线断路器,以及由熔断器和指示灯串联连接后接驳在相、零线之间的回路。 9. A dual power conversion device according to claim 1, characterized in that: the output line of the three-phase AC backup power supply is also provided with an incoming circuit breaker, and is connected in series by a fuse and an indicator light. The circuit between the phase and neutral wires.
CN2011204692836U 2011-11-23 2011-11-23 Dual-power switching device Expired - Fee Related CN202395514U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104701840A (en) * 2015-03-12 2015-06-10 杭州德洛电力设备有限公司 Intelligent three-power automatic transfer switch
CN104953703A (en) * 2015-07-03 2015-09-30 国家电网公司 Double-power-supply control box with anti-misoperation function
CN105958633A (en) * 2016-06-22 2016-09-21 中航太克(厦门)电力技术股份有限公司 Two-way power supply automatic switching power supply circuit
CN108313234A (en) * 2018-03-21 2018-07-24 无锡德林防务装备股份有限公司 Open type hydraulic system watertight controlling device for doors
CN106451689B (en) * 2016-12-15 2018-07-27 南通华夏飞机工程技术股份有限公司 A kind of power supply circuit of DC power supply vehicle
CN110174586A (en) * 2019-07-08 2019-08-27 北京航天常兴科技发展股份有限公司 One kind supplies power with double circuit system and its anticreep false alarm monitoring device, monitoring method
CN110266099A (en) * 2019-06-04 2019-09-20 华电电力科学研究院有限公司 A kind of three phase mains switching device and its working method
US12334775B2 (en) 2020-10-28 2025-06-17 Huawei Digital Power Technologies Co., Ltd. Power supply system and control method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104701840A (en) * 2015-03-12 2015-06-10 杭州德洛电力设备有限公司 Intelligent three-power automatic transfer switch
CN104953703A (en) * 2015-07-03 2015-09-30 国家电网公司 Double-power-supply control box with anti-misoperation function
CN105958633A (en) * 2016-06-22 2016-09-21 中航太克(厦门)电力技术股份有限公司 Two-way power supply automatic switching power supply circuit
CN106451689B (en) * 2016-12-15 2018-07-27 南通华夏飞机工程技术股份有限公司 A kind of power supply circuit of DC power supply vehicle
CN108313234A (en) * 2018-03-21 2018-07-24 无锡德林防务装备股份有限公司 Open type hydraulic system watertight controlling device for doors
CN110266099A (en) * 2019-06-04 2019-09-20 华电电力科学研究院有限公司 A kind of three phase mains switching device and its working method
CN110266099B (en) * 2019-06-04 2023-11-14 华电电力科学研究院有限公司 Three-phase power supply switching device and working method thereof
CN110174586A (en) * 2019-07-08 2019-08-27 北京航天常兴科技发展股份有限公司 One kind supplies power with double circuit system and its anticreep false alarm monitoring device, monitoring method
US12334775B2 (en) 2020-10-28 2025-06-17 Huawei Digital Power Technologies Co., Ltd. Power supply system and control method

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