CN111009892A - Distribution board - Google Patents
Distribution board Download PDFInfo
- Publication number
- CN111009892A CN111009892A CN201910501297.2A CN201910501297A CN111009892A CN 111009892 A CN111009892 A CN 111009892A CN 201910501297 A CN201910501297 A CN 201910501297A CN 111009892 A CN111009892 A CN 111009892A
- Authority
- CN
- China
- Prior art keywords
- power supply
- load
- main
- terminal
- switching device
- 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.)
- Pending
Links
- 230000007935 neutral effect Effects 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Distribution Board (AREA)
Abstract
The present invention provides a power distribution panel, comprising: a main switching device having one end for connection to a main power supply; a load switching device having one end for connection to a load; and a power supply changeover switch controllably causing the other end of the load switching device to be electrically connected to one of the other end of the main switching device and a power supply terminal of the backup power source. The distribution board can continuously supply power to the load when the main power supply has power failure or overvoltage or undervoltage.
Description
Technical Field
The invention relates to the field of power distribution, in particular to a distribution board.
Background
A switchboard is a device that concentrates, switches and distributes electrical energy. The distribution board comprises a cabinet body, a switch, a protection device, a monitoring device, an electric energy meter and other electronic components. The distribution board is used for receiving and distributing electric energy, can conveniently cut off the power supply and transmit power, and plays a role in metering and judging the power supply and power transmission.
However, the conventional distribution board can supply or stop power to the load, and has a single function. When power failure or overvoltage and undervoltage occur, the switchboard can not continuously supply power to the load.
Disclosure of Invention
In view of the above technical problems in the prior art, the present invention provides a distribution board, including:
a main switching device having one end for connection to a main power supply;
a load switching device having one end for connection to a load; and
a power supply changeover switch controllably causing the other end of the load switching device to be electrically connected to one of the other end of the main switching device and a power supply terminal of a backup power supply.
Preferably, the power supply changeover switch includes:
a common terminal electrically connected to the other end of the load switching device;
a first switching terminal electrically connected to the other end of the main switching device; and
a second switching terminal electrically connected to a power supply terminal of the backup power supply.
Preferably, the power supply changeover switch is a relay including:
a magnetic core;
a coil wound around the magnetic core;
a controllable switch in series with the coil; and
a coil power supply for powering the coil.
Preferably, when the controllable switch is controlled to be turned off, the common terminal is in contact with the first switching terminal; when the controllable switch is controlled to be on, the common terminal is in contact with the second switching terminal.
Preferably, the controllable switch is a triode, a power switch tube or an optocoupler control switch, the main switching device is a bipolar circuit breaker, and the load switching device is a single-pole circuit breaker.
Preferably, the backup power supply includes: a charger for charging a rechargeable battery with the alternating current of the main power supply; and a DC-AC converter for converting the direct current output from the rechargeable battery into alternating current.
Preferably, the backup power supply comprises an auxiliary power supply module, the input end of which is connected to both ends of the rechargeable battery and is used for providing direct current for the power supply changeover switch.
Preferably, the electrical panel further comprises a current transformer for measuring current in the load switching device.
Preferably, the power distribution panel further comprises: a main cable bushing for wrapping or jacketing together a set of live, neutral and ground wires, the set of live, neutral and ground wires in the main cable bushing configured to be electrically connected to the main power supply; and a load cable sleeve for wrapping or jacketing together a set of live, neutral, and ground wires, the set of live, neutral, and ground wires in the load cable sleeve configured to be electrically connected to the load.
Preferably, the power distribution panel further comprises: a zero line bank for electrically connecting a zero line in the switchboard; and a ground line bank for electrically connecting a ground line in the distribution board.
The distribution board can controllably supply power to the load continuously during the period of power failure or overvoltage and undervoltage of the main power supply. The relays in the switchboard are advantageous for saving the electrical energy of their coil power supplies. The cable sleeve in the distribution board can facilitate the wiring of operators and avoid misconnection. The zero line row and the ground line row in the distribution board reduce the complexity of wiring, prevent miswiring, save the wiring cost, reduce the wiring space and make the space of the distribution board more compact.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings, in which:
fig. 1 is a circuit diagram of a switchboard according to a preferred embodiment of the present invention during normal supply of the mains.
Fig. 2 is a circuit diagram of the distribution board shown in fig. 1 during a main power supply failure or overvoltage/undervoltage period.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by embodiments with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of a switchboard according to a preferred embodiment of the present invention during normal supply of the mains. As shown in fig. 1, the switchboard 1 comprises a main circuit breaker CB electrically connected between a main power supply and a load (not shown in fig. 1), relays K1, K2 and K3, load circuit breakers CB1, CB2, CB 3; current transformers CT1, CT2, CT3 for measuring currents in the load circuit breakers CB1, CB2, CB3, respectively; a main cable bushing WB for wrapping or jacketing a group of live, neutral and ground wires together, load cable bushings WB1, WB2, WB3 for wrapping or jacketing a group of live, neutral and ground wires together, and a zero bar NB and a ground bar EB.
The main circuit breaker CB may be a bipolar circuit breaker, and the specific device structure thereof is well known to those skilled in the art and will not be described herein. The live and neutral terminals of one end of the main circuit breaker CB are electrically connected to the live L and neutral N terminals, respectively, of the main power supply, the live and neutral terminals BPSL and BPSN of the other end thereof are electrically connected to the input of a backup power supply (not shown in fig. 1), and the live terminal BPSL thereof is also used to supply power to the load through the relays K1, K2 and K3.
The load circuit breakers CB1, CB2 and CB3 may be single-pole circuit breakers, and specific device structures thereof are well known to those skilled in the art and will not be described herein. The load circuit breakers CB1, CB2, CB3 have one ends connected to the first load, the second load, and the third load (not shown in fig. 1), respectively, and the other ends connected to the relays K1, K2, and K3, respectively.
The relays K1, K2, and K3 are the same, and only the relay K1 will be described below. The relay K1 includes a common terminal 11, a first switching terminal 12, and a second switching terminal 13, wherein the common terminal 11 is electrically connected to the other end of the load circuit breaker CB1, the first switching terminal 12 is electrically connected to the live terminal BPSL of the other end of the main circuit breaker CB, and the second switching terminal 13 is electrically connected to the live line Uo of the output terminal of the backup power source (i.e., the power supply terminal of the backup power source), wherein the neutral line (not shown in fig. 1) of the output terminal of the backup power source is electrically connected to the zero line bank NB. The relay K1 further comprises a magnetic core 15, a coil 16 wound on the magnetic core 15, a controllable switch 14 connected in series with the coil 16, and a coil power supply Vcc for supplying power to the coil 16. When the controllable switch 14 is controlled to be in the open state, the common terminal 11 is in contact with the first switching terminal 12, whereby the other end of the load breaker CB1 is electrically connected to the live line terminal BPSL of the other end of the main breaker CB. When the controllable switch 14 is controlled to be in a conducting state, the common terminal 11 is in contact with the second switching terminal 13, whereby the other end of the load breaker CB1 is electrically connected to the live line Uo of the output of the backup power supply. The common terminal 11 of the relay K1 is controllably connected to one of the first and second switching terminals 12 and 13, so that the other end of the load breaker CB1 is electrically connected to one of the live line terminal BPSL of the other end of the main breaker CB and the output Uo of the backup power source.
One end of three wires (i.e., the live wire, the zero wire and the ground wire) in the main cable bushing WB is used for being electrically connected to the live wire L, the zero wire N and the ground wire E of the main power supply respectively, and the other end thereof is electrically connected to the live wire, the zero wire and the ground wire bar EB at one end of the main circuit breaker CB. Three wires (i.e., live, neutral, and ground) in load cable bushing WB1 have one end for electrical connection to the live, neutral, and ground terminals, respectively, of the first load and another end electrically connected to one end of load circuit breaker CB1, neutral, and ground bars NB, EB, respectively. The three wires in the load cable sleeves WB2, WB3 are connected in a similar manner to the three wires in the load cable sleeve WB1, and therefore, the description thereof is omitted. The zero line bank NB electrically connects all the zero lines in the switchboard 1 together, and the ground line bank EB electrically connects all the grounds in the switchboard 1 together.
The distribution principle of the above-described switchboard will be described below in connection with the supply of mains power, respectively.
When the main power supply is normally powered, the controllable switch 14, the controllable switch 24 and the controllable switch 34 are controlled to be in an off state, and at the moment, the power of the main power supply is transmitted to the main circuit breaker CB and is electrically connected to the load circuit breakers CB1, CB2 and CB3 through the relays K1, K2 and K3 respectively so as to supply power to the first load, the second load and the third load respectively.
And controlling a controllable switch corresponding to a certain load to be conducted if the power supply to the load is required to be stopped during the period that the main power supply is normally supplied and the backup power supply does not supply alternating current. For example, if the first load does not need to be supplied with power, the controllable switch 14 in the relay K1 is controlled to be on so that the common terminal 11 of the relay K1 is connected to the second switching terminal 13, whereby the connection between the live wire terminal BPSL at the other end of the main breaker CB and the other end of the load breaker CB1 is disconnected, and the first load connected to the load breaker CB1 is stopped from being supplied with power, whereby it is possible to selectively control whether each load is supplied with power by the main power supply.
Fig. 2 is a circuit diagram of the distribution board shown in fig. 1 during a main power supply failure or overvoltage/undervoltage period. As shown in fig. 2, when the main power supply fails or runs under voltage, the main circuit breaker CB is opened and the output Uo of the backup power supply supplies the required ac power. The controllable switch 14, the controllable switch 24 and the controllable switch 34 are all controlled to be in a conducting state, and the output terminal Uo of the backup power source 5 is electrically connected with load circuit breakers CB1, CB2 and CB3 through relays K1, K2 and K3, respectively, so as to supply power to the first load, the second load and the third load, respectively.
And controlling a controllable switch in a relay electrically connected with a certain load to be disconnected if the power supply of the load needs to be stopped during the period that the power supply of the main power supply is stopped and the output end UO of the backup power supply provides the required alternating current. For example, if it is desired to stop the supply of power to the second load, the controllable switch 24 is controlled to be in an open state, whereby the common terminal of the relay K2 is connected to the first switching terminal, thereby breaking the conductive path between the load breaker CB2 and the output Uo of the backup power supply, whereby it is possible to selectively control whether each load is supplied with power by the backup power supply.
The current transformers CT1, CT2 and CT3 are respectively used for measuring load currents in a first load, a second load and a third load which are electrically connected with the load circuit breakers CB1, CB2 and CB3, and the power of the loads is judged according to the magnitude of the load currents. When the power of a load is large, for example, the power of the third load is larger than the output power of the backup power supply, the controllable switch 34 is controlled to be turned off, and the power supply to the third load is stopped. Thereby enabling selective control of whether the load is powered by the backup power source.
In summary, when the main power supply is powered off or is under-voltage, the output Uo of the backup power supply provides alternating current, and if a load with relatively high importance (i.e., needing to be continuously supplied with power) and relatively low power consumption exists in a plurality of loads, the controllable switch in the relay electrically connected with the load is controlled to be turned on, so that the alternating current at the output Uo of the backup power supply is transmitted to the load. Finally, the purpose that the backup power supply is selectively used for continuously supplying power to the more important load with lower power consumption during the power failure or over-voltage and under-voltage period of the main power supply is achieved.
The main power supply can normally supply power to the load in most of time, so that the common terminal in the relay is connected to the first switching terminal in most of time, the controllable switch in the relay is in an off state, the coil power supply Vcc does not supply power to the coil in most of time, and the electric energy of the coil power supply Vcc is saved.
Each cable sleeve on the distribution board wraps or is sleeved with a group of live wires, zero wires and ground wires, so that the wiring of operators is facilitated, and the mis-wiring is avoided.
The zero line row on the distribution board connects all the zero lines together, and the ground line row connects all the ground lines together. When a user accesses a load, the live wire terminal, the zero line terminal and the ground wire terminal of each load are only required to be electrically connected with the live wire, the zero line and the ground wire wrapped or sleeved by each cable sleeve respectively, and extra wires are not required to be added to be connected to the zero line and the ground wire in the distribution board. The wiring complexity is reduced, the misconnection of the live wire terminal, the zero line terminal and the ground wire terminal of the load and the connecting terminal on the switchboard is prevented, the length of the lead is reduced, and the wiring cost is saved; the wiring space of the zero line and the ground wire is reduced, so that the space of the distribution board is more compact.
According to one embodiment of the invention, the power supply condition of the main power supply can be judged by detecting the voltage of the main power supply. For example, when the first threshold voltage is less than or equal to the voltage of the main power supply less than or equal to the second threshold voltage, the main power supply is judged to be normal. And when the voltage of the main power supply is less than the first threshold voltage, judging that the main power supply is powered off or is under-voltage. And judging the overvoltage of the main power supply when the voltage of the main power supply is larger than the second threshold voltage. The present invention is not intended to limit the specific values of the first threshold voltage and the second threshold voltage, which may be determined according to the withstand voltage range of the load, for example, the first threshold voltage may be selected to be 70% of the rated voltage, and the second threshold voltage may be 130% of the rated voltage.
The backup power supply in the above-described embodiment of the present invention preferably includes a charger, a rechargeable battery, a DC-AC converter, and an auxiliary power supply module. The input end of the charger is connected to the live wire terminal BPSL and the zero line terminal BPSN at the other end of the main circuit breaker CB, and the output end of the charger is connected to the two ends of the rechargeable battery for charging the rechargeable battery. The input terminal of the DC-AC converter is connected to both terminals of the rechargeable battery for converting the direct current in the rechargeable battery into alternating current. The input terminals of the auxiliary power module are connected to both ends of the rechargeable battery, and the output thereof is used to supply various required dc voltages, such as coil power Vcc for relays K1, K2, and K3.
In other embodiments of the present invention, the connection relationship of the relay is configured to: when the controllable switch is in a conducting state, the common terminal is connected to the first change-over switch; and when its controllable switch is in the off-state, its common terminal is connected to the second changeover switch.
The controllable switch of the invention is different from a manually operated switch device, and can be a current control element such as a triode, a voltage control element such as a power switch tube, an optical coupling control switch and the like.
In another embodiment of the present invention, a power supply changeover switch such as a single-pole double-throw switch is used instead of the common terminal, the first changeover terminal, and the second changeover terminal in the relay of the above-described embodiment.
In other embodiments of the present invention, a switching device such as an air switch, an overvoltage/undervoltage release, or an ac contactor, which can turn on and off a load circuit, is used instead of the main breaker or the load breaker in the above embodiments.
The distribution board of the present invention is not limited to supplying 3 loads, and may distribute any number of load branches, each of which includes a load breaker, a current transformer, and a relay.
Although the present invention has been described by way of preferred embodiments, the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the present invention.
Claims (10)
1. A power panel, comprising:
a main switching device having one end for connection to a main power supply;
a load switching device having one end for connection to a load; and
a power supply changeover switch controllably causing the other end of the load switching device to be electrically connected to one of the other end of the main switching device and a power supply terminal of a backup power supply.
2. The power panel of claim 1, wherein the power supply diverter switch comprises:
a common terminal electrically connected to the other end of the load switching device;
a first switching terminal electrically connected to the other end of the main switching device; and
a second switching terminal electrically connected to a power supply terminal of the backup power supply.
3. The electrical panel of claim 2, wherein the power supply diverter switch is a relay comprising:
a magnetic core;
a coil wound around the magnetic core;
a controllable switch in series with the coil; and
a coil power supply for powering the coil.
4. The electrical panel of claim 3, wherein the common terminal is in contact with the first switching terminal when the controllable switch is controlled to be open; when the controllable switch is controlled to be on, the common terminal is in contact with the second switching terminal.
5. The panelboard of claim 3, wherein the controllable switch is a triode, power switch tube, or opto-coupler control switch, the main switching device is a bipolar circuit breaker, and the load switching device is a single-pole circuit breaker.
6. The power panel of claim 1, wherein the backup power source comprises:
a charger for charging a rechargeable battery with the alternating current of the main power supply; and
a DC-AC converter for converting the direct current output from the rechargeable battery into alternating current.
7. The power panel of claim 6, wherein the backup power source comprises an auxiliary power module having an input connected to both ends of the rechargeable battery and configured to provide direct current to the power supply switch.
8. The panelboard of any of claims 1-7, further comprising a current transformer to measure current in the load switchgear.
9. The panelboard of any of claims 1-7, further comprising:
a main cable bushing for wrapping or jacketing together a set of live, neutral and ground wires, the set of live, neutral and ground wires in the main cable bushing configured to be electrically connected to the main power supply; and
a load cable sleeve for wrapping or jacketing together a set of live, neutral and ground wires, the set of live, neutral and ground wires in the load cable sleeve configured to be electrically connected to the load.
10. The panelboard of any of claims 1-7, further comprising:
a zero line bank for electrically connecting a zero line in the switchboard; and
a ground line bank for electrically connecting a ground line in the distribution board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910501297.2A CN111009892A (en) | 2019-06-11 | 2019-06-11 | Distribution board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910501297.2A CN111009892A (en) | 2019-06-11 | 2019-06-11 | Distribution board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111009892A true CN111009892A (en) | 2020-04-14 |
Family
ID=70111396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910501297.2A Pending CN111009892A (en) | 2019-06-11 | 2019-06-11 | Distribution board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111009892A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009059516A1 (en) * | 2007-10-29 | 2009-05-14 | Chengdu Huawei Symantec Technologies Co., Ltd. | Device and method for controlling switch of main power supply and backup power supply |
| CN202721403U (en) * | 2012-06-27 | 2013-02-06 | 天津市建电实业有限公司 | Terminal distribution box |
| US20130038291A1 (en) * | 2011-08-08 | 2013-02-14 | Hon Hai Precision Industry Co., Ltd. | Power supply system for electric loads |
| CN203416038U (en) * | 2013-06-28 | 2014-01-29 | 比亚迪股份有限公司 | Dual power supply device |
| CN204216564U (en) * | 2014-09-15 | 2015-03-18 | 福建通用同溢电气有限公司 | A kind of distribution new equipment |
| CN104734264A (en) * | 2013-12-23 | 2015-06-24 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Online interactive uninterruptible power supply and control method thereof |
| CN204633464U (en) * | 2015-06-08 | 2015-09-09 | 国网黑龙江省电力有限公司绥化供电公司 | Double loop power supply automatic switching power supply circuits |
| CN105634111A (en) * | 2016-03-07 | 2016-06-01 | 成都比善科技开发有限公司 | Standby battery based uninterruptible power supply for entrance guard |
| CN205489490U (en) * | 2016-01-06 | 2016-08-17 | 西门子制造工程中心有限公司 | Electric power distribution system's protection device , electric power distribution system |
| CN106059055A (en) * | 2016-07-01 | 2016-10-26 | 无锡韩光电器股份有限公司 | Control circuit of automatic changeover switch device |
| CN106981922A (en) * | 2017-04-06 | 2017-07-25 | 姚永红 | Stand-by power supply automatic switching control equipment |
| TWM569965U (en) * | 2018-08-29 | 2018-11-11 | 尚偉機電有限公司 | Automatic change-over switch monitoring device |
-
2019
- 2019-06-11 CN CN201910501297.2A patent/CN111009892A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009059516A1 (en) * | 2007-10-29 | 2009-05-14 | Chengdu Huawei Symantec Technologies Co., Ltd. | Device and method for controlling switch of main power supply and backup power supply |
| US20130038291A1 (en) * | 2011-08-08 | 2013-02-14 | Hon Hai Precision Industry Co., Ltd. | Power supply system for electric loads |
| CN202721403U (en) * | 2012-06-27 | 2013-02-06 | 天津市建电实业有限公司 | Terminal distribution box |
| CN203416038U (en) * | 2013-06-28 | 2014-01-29 | 比亚迪股份有限公司 | Dual power supply device |
| CN104734264A (en) * | 2013-12-23 | 2015-06-24 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Online interactive uninterruptible power supply and control method thereof |
| CN204216564U (en) * | 2014-09-15 | 2015-03-18 | 福建通用同溢电气有限公司 | A kind of distribution new equipment |
| CN204633464U (en) * | 2015-06-08 | 2015-09-09 | 国网黑龙江省电力有限公司绥化供电公司 | Double loop power supply automatic switching power supply circuits |
| CN205489490U (en) * | 2016-01-06 | 2016-08-17 | 西门子制造工程中心有限公司 | Electric power distribution system's protection device , electric power distribution system |
| CN105634111A (en) * | 2016-03-07 | 2016-06-01 | 成都比善科技开发有限公司 | Standby battery based uninterruptible power supply for entrance guard |
| CN106059055A (en) * | 2016-07-01 | 2016-10-26 | 无锡韩光电器股份有限公司 | Control circuit of automatic changeover switch device |
| CN106981922A (en) * | 2017-04-06 | 2017-07-25 | 姚永红 | Stand-by power supply automatic switching control equipment |
| TWM569965U (en) * | 2018-08-29 | 2018-11-11 | 尚偉機電有限公司 | Automatic change-over switch monitoring device |
Non-Patent Citations (1)
| Title |
|---|
| ***等: "《PLC电气控制技术》", 30 September 2018, 中国矿业大学出版社, pages: 8 - 10 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211089218U (en) | High-capacity high-reliability rapid power supply switching device | |
| US20170149379A1 (en) | Interconnect device for use in islanding a microgrid | |
| CN101651294B (en) | Integral control system of distribution transformer | |
| CN112164559A (en) | Self-adaptive variable-range current transformer | |
| US20060146464A1 (en) | Overvoltage protection device | |
| CN110970866A (en) | Contactor control device and power supply system | |
| CN111009892A (en) | Distribution board | |
| CN213754084U (en) | Dual-power supply system adopting power supplies with different grounding modes | |
| CN110994772A (en) | Power distribution system and control method thereof | |
| CN109510301B (en) | Mixed type dual power supply conversion circuit and dual power supply system | |
| CN209823504U (en) | Automatic switching system for control power supply of low-voltage contact cabinet | |
| CN220107649U (en) | Low-voltage switch cabinet capable of automatically switching three-way power inlet wires | |
| RU117732U1 (en) | HIGH VOLTAGE DISTRIBUTION DEVICE | |
| CN110504670A (en) | The power supply system and method for supplying power to of DC distribution net | |
| CN220585980U (en) | Neutral line circuit breaking protection circuit, device and power supply device | |
| CN219458739U (en) | Circulation-preventing GIS double-loop power supply control device | |
| KR200238278Y1 (en) | Nothing power failure connection panel | |
| CN211405591U (en) | Double-incoming-wire power supply circuit and double-incoming-wire power supply device | |
| CN211376559U (en) | Circuit breaker | |
| CN108281966B (en) | Dual-power standby power supply operation control system for public building residential distribution room | |
| SU1030911A1 (en) | Device for power transmission to three-phase loads in isolated neutral system | |
| CN215990324U (en) | Line protection measurement and control device | |
| CN220290716U (en) | Phase-change switching device for single-phase user terminal of electric line | |
| CN114069569B (en) | Method for reducing electric quantity loss of distribution box in fault state | |
| CN210780201U (en) | Low-voltage power distribution cabinet secondary control power supply circuit and low-voltage power distribution cabinet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Vasilakay Christie Inventor after: Qi Chuanqing Inventor after: Xie Kaijun Inventor after: Lei Long Inventor after: Zhan Yanmei Inventor before: A. C. vasilachi Inventor before: Qi Chuanqing Inventor before: Xie Kaijun Inventor before: Lei Long Inventor before: Zhan Yanmei |
|
| CB03 | Change of inventor or designer information |