CN111313530B - Emergency lighting power distribution device - Google Patents
Emergency lighting power distribution device Download PDFInfo
- Publication number
- CN111313530B CN111313530B CN202010170944.9A CN202010170944A CN111313530B CN 111313530 B CN111313530 B CN 111313530B CN 202010170944 A CN202010170944 A CN 202010170944A CN 111313530 B CN111313530 B CN 111313530B
- Authority
- CN
- China
- Prior art keywords
- power supply
- fire
- standby
- input end
- fighting linkage
- 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.)
- Active
Links
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
- H02J9/02—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which an auxiliary distribution system and its associated lamps are brought into service
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses an emergency lighting power distribution device, which comprises a common power supply input end, a standby power supply input end, at least one alternating current contactor, a double-power-supply change-over switch and a fire-fighting linkage indicator lamp, wherein the common power supply input end is connected with the standby power supply input end; the common power supply input end and the standby power supply input end are respectively connected with at least one alternating current contactor and a plurality of miniature circuit breakers through a double-power-supply change-over switch so as to control emergency lighting elements corresponding to the number of paths; the fire-fighting linkage indicator lamp is respectively connected with a common power supply path and a standby power supply path through the main and standby interlocking relays, so that when the common power supply loses power, the fire-fighting linkage indicator lamp is switched from the common power supply path to the standby power supply path, and normal indication of the fire-fighting linkage indicator lamp is guaranteed. The invention can ensure that the linkage state of the current emergency lighting power distribution device can still be normally indicated even under the condition that the common power supply loses power, and the correct application of the emergency lighting power distribution device is ensured.
Description
Technical Field
The invention relates to the technical field of power distribution, in particular to an emergency lighting power distribution device.
Background
The emergency lighting power distribution device is generally used for controlling an emergency lighting lamp and has a function of controlling controlled equipment to execute a preset action after receiving a fire signal. The emergency lighting power distribution device in the prior art usually adopts double power supplies (namely a common power supply and a standby power supply), and can be switched to the standby power supply for supplying power when the common power supply cannot normally supply power to the emergency lighting element; the existing emergency lighting power distribution device is generally required to be provided with a fire-fighting linkage indicating lamp for indicating the linkage state of the emergency lighting power distribution device, and the power supply of the fire-fighting linkage indicating lamp is generally provided by a common power supply in the industry at present, namely, the fire-fighting linkage indicating lamp only takes power from the common power supply end to indicate the linkage state of the emergency lighting power distribution device. The connecting structure of the fire-fighting linkage indicator lamp in the prior art has the following disadvantages: when emergency lighting distribution device's power end commonly used was in case when losing power, emergency lighting distribution device's fire control linkage pilot lamp had also not lighted this moment to make the operating personnel who corresponds emergency lighting distribution device can't know whether emergency lighting distribution device is in the linkage state, influenced the correct application corresponding emergency lighting distribution device.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an emergency lighting power distribution device, which can ensure that the linkage state of the current emergency lighting power distribution device can still be normally indicated even if a common power supply is in power failure through structural improvement, and ensure the correct application of the emergency lighting power distribution device.
The technical scheme adopted by the invention for solving the technical problems is as follows: an emergency lighting power distribution device comprises a common power supply input end, a standby power supply input end, at least one alternating current contactor, a double-power-supply change-over switch and a fire-fighting linkage indicator lamp; the common power supply input end and the standby power supply input end are respectively connected with at least one alternating current contactor through a double-power-supply changeover switch, and emergency lighting elements with corresponding paths at the rear end are respectively controlled through the at least one alternating current contactor so as to form a common power supply path and a standby power supply path; the fire-fighting linkage indicator lamp is respectively connected with a common power supply path and a standby power supply path through the main and standby interlocking relays, so that when the common power supply loses power, the fire-fighting linkage indicator lamp is switched from the common power supply path to the standby power supply path, and normal indication of the fire-fighting linkage indicator lamp is guaranteed.
The main interlocking relay and the standby interlocking relay are switching relays, normally closed contacts of the main interlocking relay and the standby interlocking relay are connected in series with the input end of the common power supply, normally open contacts of the main interlocking relay and the standby interlocking relay are connected in series with the input end of the standby power supply, and coils of the main interlocking relay and the standby interlocking relay are connected to the power supply path of the standby power supply.
The fire-fighting interlocking device comprises a main interlocking relay, a fire-fighting linkage indicator lamp, a standby power supply input end, a fire wire and a fire wire, wherein the main interlocking relay and the standby interlocking relay are respectively provided with two groups of normally closed contacts and normally open contacts, one end of the fire-fighting linkage indicator lamp is respectively connected with the fire wire of the common power supply input end and the fire wire of the standby power supply input end through one group of normally closed contacts and one group of normally open contacts, and the other end of the fire-fighting linkage indicator lamp is respectively connected with the zero wire of the common power supply input end and the zero wire of the standby power supply input end through the other group of normally closed contacts and the other group of normally open contacts.
The power distribution device also comprises a fire-fighting linkage control relay, wherein one group of normally open contacts of the fire-fighting linkage control relay are respectively connected between the coils of the two alternating current contactors and commercial alternating current in series; the other group of normally open contacts of the fire-fighting linkage control relay is connected in series between one end of the fire-fighting linkage indicator lamp and one group of normally closed contacts and one group of normally open contacts of the main and standby interlocking relays; and a coil of the fire-fighting linkage control relay is connected to the fire-fighting linkage control signal input end.
And a fuse is also connected between the other group of normally open contacts of the fire-fighting linkage control relay and one group of normally closed contacts and one group of normally open contacts of the main and standby interlocking relays.
And a miniature circuit breaker is also connected between the double-power-supply change-over switch and the input end of the common power supply and the input end of the standby power supply respectively.
And a plurality of miniature circuit breakers corresponding to each path number are connected between the double-power-supply change-over switch and the at least one alternating current contactor.
The power distribution device also comprises a main-standby conversion relay, and a normally closed contact of the main-standby conversion relay is connected with a conversion switch in the dual-power conversion switch in series; and the coils of the main and standby switching relays are connected to the fire-fighting linkage control signal input end.
Compared with the prior art, the invention has the beneficial effects that:
the fire-fighting linkage indicator lamp is respectively connected with the common power supply path and the standby power supply path through the main and standby interlocking relays, and the main and standby interlocking relays are set to be conversion type relays, the normally closed contacts of the main and standby interlocking relays are connected with the input end of the common power supply in series, the normally open contacts of the main and standby interlocking relays are connected with the input end of the standby power supply in series, and the coils of the main and standby interlocking relays are connected to the standby power supply path. According to the structure, when the power supply path of the common power supply supplies power, the fire-fighting linkage indicator lamp is powered by the common power supply, when the common power supply loses power and is converted into the standby power supply, the coil of the main interlocking relay gets power, the magnetic circuit of the main interlocking relay works, the normally open contact of the main interlocking relay is closed, and the normally closed contact is opened, so that the fire-fighting linkage indicator lamp is converted from the common power supply to the standby power supply, the linkage state of the current emergency lighting power distribution device can be normally indicated under the condition that the common power supply loses power, and the correct application of the emergency lighting power distribution device is ensured.
The invention is further explained in detail with the accompanying drawings and the embodiments; an emergency lighting power distribution apparatus of the present invention is not limited to the embodiments.
Drawings
FIG. 1 is a schematic diagram of the main circuit principle of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an emergency lighting principle of an embodiment of the invention;
FIG. 3 is a schematic diagram of the fire fighting linkage indicating principle of the embodiment of the present invention;
FIG. 4 is a schematic diagram of the terminals of a dual power transfer switch of an embodiment of the present invention;
FIG. 5 is a fire feedback signal schematic of an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the principle of primary/standby switching signals according to an embodiment of the present invention;
fig. 7 is a schematic view of a terminal distribution according to an embodiment of the present invention.
Detailed Description
Examples
Referring to fig. 1 to 7, an emergency lighting power distribution apparatus according to the present invention includes a common power input terminal, a standby power input terminal, two ac contactors 1KM and 2KM, and a dual power transfer switch ATS, where in this embodiment, the two ac contactors 1KM and 2KM respectively control 6 emergency lighting elements n1, n2, n3, n4, n5, and n 6; the common power supply input end and the standby power supply input end are respectively connected with two alternating current contactors 1KM and 2KM through a dual power supply changeover switch AST, and emergency lighting elements with corresponding paths are respectively controlled through the two alternating current contactors 1KM and 2KM so as to form a common power supply path and a standby power supply path; the power distribution device further comprises a fire-fighting linkage indicator light HR1, wherein the fire-fighting linkage indicator light HR1 is respectively connected with a common power supply access and a standby power supply access through an active-standby interlocking relay KA3, so that when the common power supply loses power, the fire-fighting linkage indicator light HR1 is switched to be supplied with power through the common power supply access so as to guarantee normal indication of the fire-fighting linkage indicator light.
In this embodiment, as shown in fig. 3, the main/standby interlock relay KA3 is a switching relay, a normally closed contact of the main/standby interlock relay KA3 is connected in series with the common power input terminals 1L and 1N, a normally open contact of the main/standby interlock relay KA3 is connected in series with the standby power input terminals 2L and 2N, and a coil of the main/standby interlock relay KA3 is connected to the standby power supply path.
In this embodiment, the normally closed contact and the normally open contact of master spare interlocking relay KA3 are two sets of respectively, the live wire 1L of power input end and the live wire 2L of stand-by power input end are connected respectively through a set of normally closed contact and a set of normally open contact to the one end of fire control linkage pilot lamp HR1, the zero line 1N of power input end and the zero line 2N of stand-by power input end are connected respectively through another group of normally closed contact and another group of normally open contact to the other end of fire control linkage pilot lamp HR 1.
In this embodiment, the power distribution device further includes a fire-fighting linkage control relay KA, wherein one group of normally open contacts of the fire-fighting linkage control relay KA is respectively connected in series between the coils of the two ac contactors 1KM and 2KM and the commercial ac power; the other group of normally open contacts of the fire-fighting linkage control relay KA is connected in series between one end of a fire-fighting linkage indicator light HR1 and one group of normally closed contacts and one group of normally open contacts of the main and standby interlocking relay KA 3; and a coil of the fire-fighting linkage control relay KA is connected to a fire-fighting linkage control signal input end.
In this embodiment, a fuse 2FU is further connected between the other set of normally open contacts of the fire-fighting linkage control relay KA and the set of normally closed contacts and the set of normally open contacts of the main and standby interlock relay KA 3.
In this embodiment, a micro breaker QF1 and a micro breaker QF2 are respectively connected between the dual power transfer switch AST and the input end of the common power supply and the input end of the standby power supply.
In this embodiment, a plurality of micro circuit breakers corresponding to the number of each path are further connected between the dual power transfer switch AST and the two ac contactors 1KM and 2KM, and the embodiment is connected with micro circuit breakers 1QF1, 1QF2, 1QF3, 1QF4, 1QF5 and 1QF 6.
In this embodiment, the power distribution device further includes a main-standby transfer relay KA4, and a normally closed contact of the main-standby transfer relay KA4 is connected in series with a transfer switch 1SS in the dual-power transfer switch AST; and the coil of the main-standby switching relay KA4 is connected to the fire-fighting linkage control signal input end.
In this embodiment, the power distribution device further includes operation feedback relays KA1, KA2, a common power indicator HG4, a common power switch-on indicator HG3, a standby power indicator HG2, and a standby power switch-on indicator HG 1.
The invention relates to an emergency lighting power distribution device, which is characterized in that a fire-fighting linkage indicator lamp HR1 is respectively connected with a common power supply passage and a standby power supply passage through a main interlocking relay KA3, the main interlocking relay KA3 is set as a conversion type relay, a normally closed contact of the main interlocking relay KA3 is connected with the common power supply input end in series, a normally open contact of the main interlocking relay KA3 is connected with the standby power supply input end in series, and a coil of the main interlocking relay KA3 is connected into the standby power supply passage. According to the structure, when the power supply path of the common power supply supplies power, the fire-fighting linkage indicator light HR1 is supplied with power by the common power supply, when the common power supply loses power and is converted into the standby power supply, the coil of the main interlocking relay KA3 is electrified, the magnetic circuit of the main interlocking relay KA3 works, the normally open contact of the main interlocking relay KA3 is closed, and the normally closed contact is opened, so that the fire-fighting linkage indicator light is converted from the common power supply into the standby power supply, and through the cooperation with the fire-fighting linkage control relay KA, the linkage state of the current emergency lighting power distribution device can be still normally indicated under the condition that the common power supply loses power, and the correct application of the corresponding emergency lighting power distribution device is guaranteed.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the scope of the disclosed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (7)
1. An emergency lighting power distribution device comprises a common power supply input end, a standby power supply input end, at least one alternating current contactor, a double-power-supply change-over switch and a fire-fighting linkage indicator lamp; the common power supply input end and the standby power supply input end are respectively connected with at least one alternating current contactor through a double-power-supply changeover switch, and emergency lighting elements with corresponding paths at the rear end are respectively controlled through the at least one alternating current contactor so as to form a common power supply path and a standby power supply path; the method is characterized in that: the fire-fighting linkage indicator lamp is respectively connected with a common power supply path and a standby power supply path through a main interlocking relay, so that when the common power supply loses power, the fire-fighting linkage indicator lamp is switched from the power supply of the common power supply path to the power supply of the standby power supply path, and the normal indication of the fire-fighting linkage indicator lamp is ensured; the number of the alternating current contactors is two; a plurality of miniature circuit breakers corresponding to each path number are connected between the double-power-supply change-over switch and the two alternating-current contactors; and the coils of the two alternating current contactors are connected in parallel between the live wire and the zero line at the input end of the common power supply.
2. The emergency lighting power distribution apparatus of claim 1, wherein: the main interlocking relay and the standby interlocking relay are switching relays, normally closed contacts of the main interlocking relay and the standby interlocking relay are connected in series with the input end of the common power supply, normally open contacts of the main interlocking relay and the standby interlocking relay are connected in series with the input end of the standby power supply, and coils of the main interlocking relay and the standby interlocking relay are connected to the power supply path of the standby power supply.
3. The emergency lighting power distribution apparatus of claim 2, wherein: the fire-fighting interlocking device comprises a main interlocking relay, a fire-fighting linkage indicator lamp, a standby power supply input end, a fire wire and a fire wire, wherein the main interlocking relay and the standby interlocking relay are respectively provided with two groups of normally closed contacts and normally open contacts, one end of the fire-fighting linkage indicator lamp is respectively connected with the fire wire of the common power supply input end and the fire wire of the standby power supply input end through one group of normally closed contacts and one group of normally open contacts, and the other end of the fire-fighting linkage indicator lamp is respectively connected with the zero wire of the common power supply input end and the zero wire of the standby power supply input end through the other group of normally closed contacts and the other group of normally open contacts.
4. The emergency lighting power distribution apparatus of claim 3, wherein: the power distribution device also comprises a fire-fighting linkage control relay, wherein one group of normally open contacts of the fire-fighting linkage control relay are respectively connected between the coils of the two alternating current contactors and commercial alternating current in series; the other group of normally open contacts of the fire-fighting linkage control relay is connected in series between one end of the fire-fighting linkage indicator lamp and one group of normally closed contacts and one group of normally open contacts of the main and standby interlocking relays; and a coil of the fire-fighting linkage control relay is connected to the fire-fighting linkage control signal input end.
5. The emergency lighting power distribution apparatus of claim 4, wherein: and a fuse is also connected between the other group of normally open contacts of the fire-fighting linkage control relay and one group of normally closed contacts and one group of normally open contacts of the main and standby interlocking relays.
6. The emergency lighting power distribution apparatus of claim 1, wherein: and a miniature circuit breaker is also connected between the double-power-supply change-over switch and the input end of the common power supply and the input end of the standby power supply respectively.
7. The emergency lighting power distribution apparatus of claim 1, wherein: the power distribution device also comprises a main-standby conversion relay, and a normally closed contact of the main-standby conversion relay is connected with a conversion switch in the dual-power conversion switch in series; and the coils of the main and standby switching relays are connected to the fire-fighting linkage control signal input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010170944.9A CN111313530B (en) | 2020-03-12 | 2020-03-12 | Emergency lighting power distribution device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010170944.9A CN111313530B (en) | 2020-03-12 | 2020-03-12 | Emergency lighting power distribution device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111313530A CN111313530A (en) | 2020-06-19 |
| CN111313530B true CN111313530B (en) | 2022-04-19 |
Family
ID=71147592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010170944.9A Active CN111313530B (en) | 2020-03-12 | 2020-03-12 | Emergency lighting power distribution device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111313530B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003366B (en) * | 2020-08-22 | 2021-10-15 | 江苏瑞墨建筑科技有限公司 | Quick maintenance system of fire control linkage power |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101765277A (en) * | 2010-02-05 | 2010-06-30 | 潍坊昌大建设集团有限公司 | Emergency lightening control circuit |
| CN102130495A (en) * | 2010-11-04 | 2011-07-20 | 北京鼎汉技术股份有限公司 | Method for realizing alternating current bypass direct supply based on contactor with normally open and normally closed main contacts |
| CN104682542A (en) * | 2013-11-28 | 2015-06-03 | 深圳市海洋王照明工程有限公司 | Emergency illumination lamp control circuit |
| CN106059053A (en) * | 2016-05-31 | 2016-10-26 | 广州地铁集团有限公司 | Double-power-supply automatic switching device |
| CN106340953A (en) * | 2016-09-30 | 2017-01-18 | 上海华虹宏力半导体制造有限公司 | Dual-supply automatic transfer switch |
| CN106953405A (en) * | 2017-05-22 | 2017-07-14 | 合肥联信电源有限公司 | It is a kind of that there is the emergency power system for exporting timesharing handoff functionality |
| CN107895999A (en) * | 2017-11-29 | 2018-04-10 | 合肥联信电源有限公司 | A kind of city piping lane power and lighting integration power-supply system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203827583U (en) * | 2014-05-04 | 2014-09-10 | 中国医药集团重庆医药设计院 | A fire hazard emergency illumination power distribution and control circuit in a double-loop power supplying mode |
| CN105186680B (en) * | 2015-10-10 | 2018-11-23 | 北京明日电力电子有限公司 | A kind of double-power intelligent controller |
-
2020
- 2020-03-12 CN CN202010170944.9A patent/CN111313530B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101765277A (en) * | 2010-02-05 | 2010-06-30 | 潍坊昌大建设集团有限公司 | Emergency lightening control circuit |
| CN102130495A (en) * | 2010-11-04 | 2011-07-20 | 北京鼎汉技术股份有限公司 | Method for realizing alternating current bypass direct supply based on contactor with normally open and normally closed main contacts |
| CN104682542A (en) * | 2013-11-28 | 2015-06-03 | 深圳市海洋王照明工程有限公司 | Emergency illumination lamp control circuit |
| CN106059053A (en) * | 2016-05-31 | 2016-10-26 | 广州地铁集团有限公司 | Double-power-supply automatic switching device |
| CN106340953A (en) * | 2016-09-30 | 2017-01-18 | 上海华虹宏力半导体制造有限公司 | Dual-supply automatic transfer switch |
| CN106953405A (en) * | 2017-05-22 | 2017-07-14 | 合肥联信电源有限公司 | It is a kind of that there is the emergency power system for exporting timesharing handoff functionality |
| CN107895999A (en) * | 2017-11-29 | 2018-04-10 | 合肥联信电源有限公司 | A kind of city piping lane power and lighting integration power-supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111313530A (en) | 2020-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111313530B (en) | Emergency lighting power distribution device | |
| CN110333410B (en) | Spare power automatic switching testing device | |
| CN213879373U (en) | ATS device based on reversible contactor | |
| CN205960788U (en) | Double - circuit switching of power sharing circuit | |
| CN211063344U (en) | Automatic interlocking control system of two incoming line cabinets and one bus-bar cabinet | |
| CN203466622U (en) | Dual power double channel automatic switching device for decomposer mixer motor | |
| CN102623979A (en) | Isolated alternating current fault current limiting circuit | |
| CN201490758U (en) | Low-pressure dual-power supply automatic switching control device | |
| CN208142917U (en) | Automatic change-over switch equipment and electric control system for it | |
| CN203014477U (en) | Automatic switching control device for alternating current lighting power failure | |
| CN211266574U (en) | Single-bus sectionalized operation mode incoming line breaker control power supply system | |
| CN210183089U (en) | Three-phase power supply switching device | |
| CN110729716B (en) | Circuit for sharing auxiliary contact for double-bus inverted bus operation | |
| CN208001079U (en) | Power distribution cabinet linkage control system and its contact cabinet control circuit | |
| CN2741256Y (en) | Sigle load-double power supply switching controller with phase-off protecter | |
| CN206878553U (en) | The power transfer device at Distributed Control System scene station | |
| CN202121547U (en) | Control system utilizing distributed control system (DCS) for controlling motors in centralized mode | |
| CN108173338B (en) | Device for automatically switching bus voltage in railway traction station | |
| CN219018680U (en) | Leading circuit of low-voltage bus tie cabinet control power supply | |
| CN110061561B (en) | Special dual-power control equipment for fire fighting | |
| CN215009758U (en) | Dual supply water source transformer power supply unit | |
| CN205792313U (en) | A kind of control circuit of auto-induction voltage-reduced starting | |
| CN211859707U (en) | Incoming line PT power supply switching device | |
| CN213768319U (en) | Control equipment of contactor of train | |
| CN211427672U (en) | Three-phase automatic circuit breaker with current limiting function allowing frequent short circuit |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |