CN208971236U - A kind of transformer Cooling control cabinet main power supply automatic switching loop - Google Patents
A kind of transformer Cooling control cabinet main power supply automatic switching loop Download PDFInfo
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- CN208971236U CN208971236U CN201821418671.XU CN201821418671U CN208971236U CN 208971236 U CN208971236 U CN 208971236U CN 201821418671 U CN201821418671 U CN 201821418671U CN 208971236 U CN208971236 U CN 208971236U
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- 238000001816 cooling Methods 0.000 title claims abstract description 18
- 238000000819 phase cycle Methods 0.000 claims abstract description 31
- 230000001681 protective effect Effects 0.000 claims abstract description 30
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Control Of Electrical Variables (AREA)
Abstract
The utility model discloses a kind of transformer Cooling control cabinet main power supply automatic switching loops, including two-way power supply, one is equipped with into electric protection breaker on per the firewire of power supply all the way, one phase sequence protective relay and an A.C. contactor, it is connected as out-put supply and control cabinet with electrical circuit behind two A.C. contactors interflow on two-way power supply, it is divided into two-way into after drawing firewire all the way on the firewire between electric protection breaker and phase sequence protective relay on per power supply all the way, the normally opened contact of phase sequence protective relay and the coil of an intermediate relay are connected in series all the way, the normally opened contact of another way series connection intermediate relay, change-over switch, the normally-closed contact of one A.C. contactor and the coil of another A.C. contactor, it is connect with the zero curve of two-way power supply behind two-way interflow on two-way power supply.The utility model avoids causing unnecessary operation troubles because of control cabinet power loss, is applicable to main power supply involved in other electrical equipments and automatically switches field.
Description
Technical field
The utility model relates to a kind of transformer Cooling control cabinet main power supply automatic switching loops, belong to power transformer
Cooling Control Technology field.
Background technique
Traditional transformer control cabinet main power supply automatically switches by ATS (Automatic transfer switching
Equipment) automatic change-over is realized, but its there are stability it is poor, at high cost, applicable elements are harsh the disadvantages of, and become
Depressor is normally operated in more severe outdoor environment, and very harsh requirement is proposed for the use of ATS, can only use at present
The degree of protection for reinforcing outdoor control cabinet, increases the measures such as insulating layer, it is ensured that the normal operation of ATS, this makes transformer control
The manufacturing cost of cabinet further increases.
Summary of the invention
Automatically switch to stablize technical problem to be solved by the utility model is: how to solve transformer control cabinet main power supply
Property problem poor, at high cost.
In order to solve the above-mentioned technical problem, there is provided a kind of transformer Cooling control cabinets for the technical solution of the utility model
Main power supply automatic switching loop, which is characterized in that including two-way power supply, be equipped with one into electricity on every firewire of power supply all the way
Protective breaker, a phase sequence protective relay and an A.C. contactor, phase sequence protective relay are set into electric protection open circuit
Between device and A.C. contactor, returned behind two A.C. contactors interflow on two-way power supply as out-put supply and control cabinet electricity consumption
Road connection, per power supply all the way on into after drawing firewire all the way on the firewire between electric protection breaker and phase sequence protective relay
It is divided into two-way, the normally opened contact of phase sequence protective relay and the coil of an intermediate relay, another way string is connected in series all the way
Connection connection respectively the normally opened contact of intermediate relay in a power, change-over switch, A.C. contactor it is normally closed
The coil of contact and another A.C. contactor is connect behind the two-way interflow on two-way power supply with the zero curve of two-way power supply.
Preferably, the normally-closed contact of the normally opened contact of the intermediate relay on every power supply all the way and A.C. contactor
Between be divided into two-way, be directly connected to change-over switch all the way, another way is connected by intermediate relay on change-over switch and another power supply
The series circuit that normally-closed contact is formed.
Preferably, the change-over switch on the power supply all the way be equipped with the first contact and the second contact and the 7th contact and
8th contact, the change-over switch on another way power supply are equipped with third contact and the 4th contact and the 5th contact and the 6th contact；
All the way when power work, the first contact and the second contact, the 5th contact and the 6th contact of change-over switch are respectively turned on, third touching
Point and the 4th contact, the 7th contact and the 8th contact remain open respectively；When another way power work, the third of change-over switch is touched
Point and the 4th contact, the 7th contact and the 8th contact are respectively turned on, the first contact and the second contact, the 5th contact and the 6th contact
It remains open respectively.
Preferably, it is described per power supply all the way on be equipped with 3 firewires, wherein a firewire be separately connected phase sequence after
The normally opened contact of electric appliance and the normally opened contact of intermediate relay.
Compared with prior art, the beneficial effects of the utility model are:
The utility model can be realized the original function of ATS, while reliability is higher, cost is lower, less by environment
Condition influences, and can be improved the operation stability of transformer Cooling control cabinet.Breaker that the utility model uses, contactor,
Phase sequence relay, change-over switch etc. are the highest ordinary appliances part of maturity currently on the market, adaptable strong, alternative property
By force, the advantages that procurement cycle is short, at low cost.
By a series of loop-around test and product beta test, the utility model has excellent applicability, can be complete
The manual exchange between active and standby power supply is embodied, the automatic switchover of backup power source after mains power failure.Simultaneously because the utility model
What is used is the electrical parts such as conventional contact, intermediate relay, and technology is more stable, and actuation time is faster, is ms grades
Actuation time, at the same electrically and mechanically the service life be also much higher than ATS equipment, these two aspects the utility model is cut main power supply
Within the time is changed by the 1s promotion to 100ms of ATS, electrical endurance is promoted by 10,000 times of ATS to ten thousand (volumes of the utility model 3-5
Constant current difference can have any different).
On the other hand the disadvantage (can only detect A phase phase shortage) in view of ATS in measurement power input defect considers returning
Phase sequence protective relay is added in road, the monitoring such as phase shortage, misphase, overvoltage, under-voltage can be carried out to three phase mains, it is ensured that control
The stability of cabinet input power processed protects electrical equipment in control cabinet.
A kind of function that for transformer cooling control cabinet main power supply automatically switches is realized by the circuit of the utility model
Can, transformer Cooling control cabinet stability, adaptability and economy are improved, while because it uses electrical part maturity higher, energy
Enough reduce transformer Cooling controller maintenance difficulty and cost.
The main power supply of the utility model for transformer cooling control cabinet is manual and automatically switches, and avoids losing because of control cabinet
Electricity and cause unnecessary operation troubles, reduce equipment failure rate, circuit according to the present utility model is applicable to other electrical
Main power supply involved in equipment automatically switches field.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of transformer Cooling control cabinet main power supply automatic switching loop.
Fig. 2 is the working state schematic representation of each contact of change-over switch.
Specific embodiment
To be clearer and more comprehensible the utility model, hereby with preferred embodiment, and attached drawing is cooperated to be described in detail below.
The utility model is a kind of transformer Cooling control cabinet main power supply automatic switching loop, passes through intermediate relay
KA, change-over switch 1KK, A.C. contactor KM switch to realize that main power supply interlocks.As shown in Figure 1 and Figure 2, the utility model packet
Two are included into electric protection breaker (first into electric protection circuit breaker Q F1, second into electric protection circuit breaker Q F2), two exchanges connect
Tentaculum (the first A.C. contactor KM1, the second A.C. contactor KM2), two phase sequence protective relay (the first phase sequence relays
Device KX1, the second phase sequence protective relay KX2), two intermediate relays (the first intermediate relay 1KA, the second intermediate relay
2KA), a change-over switch 1KK.
The firewire of the road I power supply is equipped with first into electric protection circuit breaker Q F1, the first phase sequence protective relay KX1 and first
A.C. contactor KM1, the first phase sequence protective relay KX1 are set to first into electric protection circuit breaker Q F1 and the first A.C. contactor
Between KM1；The firewire of the road II power supply is equipped with second into electric protection circuit breaker Q F2, the second phase sequence protective relay KX2 and the
Two A.C. contactor KM2, the second phase sequence protective relay KX2 are set to second into electric protection circuit breaker Q F2 and the second ac contactor
Between device KM2, out-put supply and control cabinet electricity consumption are used as behind the first A.C. contactor KM1 and the interflow the second A.C. contactor KM2
Circuit connection.
The road I power supply is equipped with 3 firewires, respectively L11, L12, L13, and first into electric protection circuit breaker Q F1, the first phase sequence
One firewire L13 points are two-way between protective relay KX1:
The normally opened contact (11 and 14) and the first intermediate relay of the first phase sequence protective relay KX1 are connected in series all the way
Normally opened contact, change-over switch 1KK, the second ac contactor of the first intermediate relay 1KA is connected in series in the coil of 1KA, another way
The coil of the normally-closed contact of device KM2 and the first A.C. contactor KM1；The first intermediate relay 1KA's on the power supply of the road I is normally opened
It is divided into two-way between contact and the normally-closed contact of the second A.C. contactor KM2, is directly connected to the contact 1 of change-over switch 1KK all the way
With 2, another way is connected by the 7th contact 7 of change-over switch 1KK and the 8th contact 8 and the second normally closed touching of intermediate relay 2KA
The series circuit that point is formed.
The road II power supply is equipped with 3 firewires, respectively L21, L22, L23, and second into electric protection circuit breaker Q F2, the first phase
One firewire L23 points are two-way between sequence protective relay KX2:
The normally opened contact (11 and 14) and the second intermediate relay of the second phase sequence protective relay KX2 are connected in series all the way
Normally opened contact, change-over switch 1KK, the first ac contactor of the second intermediate relay 2KA is connected in series in the coil of 2KA, another way
The coil of the normally-closed contact of device KM1 and the second A.C. contactor KM2；The second intermediate relay 2KA's on the power supply of the road II is normally opened
It is divided into two-way between contact and the normally-closed contact of the first A.C. contactor KM1, is directly connected to the third touching of change-over switch 1KK all the way
Point 3 and the 4th contact 4, another way are connected by the 5th contact 5 of change-over switch 1KK and the 6th contact 6 and the first intermediate relay
The series circuit that device 1KA normally-closed contact is formed.
On two-way power supply two-way (i.e. the coil of the first intermediate relay 1KA, the second intermediate relay 2KA coil,
The coil of the coil of first A.C. contactor KM1, the second A.C. contactor KM2) interflow after with the zero curve of the two-way power supply (road I
The zero curve BN of the road the zero curve AN and II power supply of power supply) connection.
As shown in Fig. 2, when the power work of the road I, the first contact 1 and the second contact 2,5 and of the 5th contact of change-over switch 1KK
6th contact 6 is respectively turned on, and third contact 3 and the 4th contact 4, the 7th contact 7 and the 8th contact 8 remain open respectively；The road II
When power work, the third contact 3 and the 4th contact 4, the 7th contact 7 and the 8th contact 8 of change-over switch 1KK is respectively turned on, the
One contact 1 and the second contact 2, the 5th contact 5 and the 6th contact 6 remain open respectively.
The utility model is made of two-way input power, when input two-way normal power source (road I power supply and the road II power supply)
When, first into electric protection circuit breaker Q F1 and second is closed a floodgate into electric protection circuit breaker Q F2, then by the first phase sequence protective relay KX1
Two-way power supply is monitored with the second phase sequence protective relay KX2, when the feelings such as phase shortage, misphase, over-voltage, under-voltage are not present in voltage
When condition, the 11st normally opened contact the 11 and the 14th of the first phase sequence protective relay KX1 and the second phase sequence protective relay KX2 are often
It opens contact 14 to close a floodgate in (001 and 002 circuit), the first intermediate relay 1KA and the second intermediate relay 2KA is powered, when
After first intermediate relay 1KA and the second intermediate relay 2KA is powered, the 5th normally opened contact 5 and the 9th normally opened contact 9 close a floodgate
(003 and 007 circuit), at this point, the uplink of change-over switch 1KK is come in circuit；
When change-over switch 1KK selects intermediate " stopping " gear, circuit can not give the first A.C. contactor KM1 and second
The coil power supply of A.C. contactor KM2, coil can not be attracted, then at position X31, X32 and X33 before control cabinet electrical circuit
Non-transformer exports, unpowered in control cabinet.
When change-over switch 1KK selects " I power work ", then manually setting the road I power supply is main power source, and the road II power supply is
Backup power source, the first contact 1 and the second contact 2, the 5th contact 5 and the 6th contact 6 of change-over switch 1KK are respectively turned on, at this time
Since the first intermediate relay 1KA is powered, the second normally-closed contact 2 and the tenth normally-closed contact 10 are disconnected, and 009 and 010 circuit is not
It is powered, then the coil of the second A.C. contactor KM2 can not be attracted, at the 11st normally-closed contact 11 and the 12nd normally-closed contact 12
In normally off, 004 and 005 circuit is powered, and the coil of the first A.C. contactor KM1 is attracted, the first A.C. contactor KM1 master
Circuit is closed a floodgate, and has power supply output at position X31, X32 and X33, is exported for the road I power supply, then main power source works；When the road I, power supply goes out
Existing failure, when over-voltage, under-voltage, phase shortage, misphase, the first phase sequence protective relay KX1 can not start, and the 11st often
It opens contact 11 and the 14th normally opened contact 14 disconnects, the coil losing electricity of the first intermediate relay 1KA, 5 He of the 5th normally opened contact
9th normally opened contact 9 is in an off state, 003,004 and 005 circuit power loss, the coil losing electricity of the first A.C. contactor KM1,
The second normally-closed contact 2 of first intermediate relay 1KA and the tenth normally-closed contact 10 closure at this time, the first A.C. contactor KM1's
11st normally-closed contact 11 and the 12nd normally-closed contact 12 are in closed state, and 007,010 and 009 circuit is powered, the second exchange
The coil of contactor KM2 obtains electric, the second A.C. contactor KM2 major loop combined floodgate, has power supply output at position X31, X32 and X33,
For the output of the road II power supply, then backup power source works, this process is realized when mains power failure, automatically switches to backup power source work
The process of work, switching time is within 100ms.
Conversely, then manually setting the road II power supply is main power source, the road I electricity when change-over switch 1KK selects " II power work "
Source is backup power source, the third contact 3 and the 4th contact 4 of change-over switch 1KK, and the 7th contact 7 and the 8th contact 8 are respectively turned on,
At this time since the second intermediate relay 2KA is powered, the second normally-closed contact 2 and the tenth normally-closed contact 10 are disconnected, and 005 and 006 time
Road no power, then the coil of the first A.C. contactor KM1 can not be attracted, the 11st normally-closed contact 11 and the 12nd normally closed touching
Point 12 is in normally off, and 008 and 009 circuit is powered, and the coil of the second A.C. contactor KM2 is attracted, the second A.C. contactor
KM2 major loop closes a floodgate, and has power supply output at position X31, X32 and X33, exports for the road II power supply, then main power source works；When the road II
Power supply breaks down, and when over-voltage, under-voltage, phase shortage, misphase, the second phase sequence protective relay KX2 can not start, the
11 normally opened contacts 11 and the 14th normally opened contact 14 disconnect, the coil losing electricity of the second intermediate relay 2KA, the 5th normally opened touching
Point 5 and the 9th normally opened contact 9 are in an off state, 007,008 and 009 circuit power loss, the deactivation coil of the second A.C. contactor KM2
Electricity, the second normally-closed contact 2 of the second intermediate relay 2KA and the tenth normally-closed contact 10 are closed at this time, the second A.C. contactor
The 11st normally-closed contact 11 of KM2 and the 12nd normally-closed contact 12 are in closed state, and 003,006 and 005 circuit is powered, the
The coil of one A.C. contactor KM1 obtains electric, the first A.C. contactor KM1 major loop combined floodgate, has electricity at position X31, X32 and X33
Source output, exports for the road I power supply, then backup power source works, this process is realized when mains power failure, automatically switched to spare
The process of power work, switching time is within 100ms.
Make a general survey of entire transformer Cooling control cabinet main power supply automatic switching loop, design principle be it is very succinct,
On the basis of cancelling ATS, 2 intermediate relays and 1 change-over switch are increased, and increase sub-fraction pilot.
Because circuit is not related to the equipment such as heavy-duty motor, the only electricity consumption of electrical part pull-in winding thus, electric current is very small, leads to control
Line specification requirement very little, usual 0.5mm2 can meet circuit requirements.Given this circuit design is succinct, and material requirements is lower, warp
The universal of large area may be implemented in the features such as Ji is had excellent performance, using in headstock, distribution service chamber and the other requirements of such as constructing
It is equipped with the occasion of main power supply, is a kind of new circuit that should be widely promoted and use.
Claims (4)
1. a kind of transformer Cooling control cabinet main power supply automatic switching loop, which is characterized in that including two-way power supply, per all the way
One is equipped on the firewire of power supply into electric protection breaker, a phase sequence protective relay and an A.C. contactor, phase sequence
After protective relay is set to two A.C. contactors interflow between electric protection breaker and A.C. contactor, on two-way power supply
Connected as out-put supply and control cabinet with electrical circuit, per power supply all the way on into electric protection breaker and phase sequence protective relay
Between firewire on draw firewire all the way after be divided into two-way, all the way be connected in series phase sequence protective relay normally opened contact and one
The coil of intermediate relay, another way be connected in series respectively the normally opened contact of institute's intermediate relay in a power, convert
The coil of (1KK), the normally-closed contact of A.C. contactor and another A.C. contactor are switched, the two-way on two-way power supply closes
It is connect with the zero curve of two-way power supply after stream.
2. a kind of transformer Cooling control cabinet main power supply automatic switching loop as described in claim 1, which is characterized in that institute
That states is divided into two-way per between the normally opened contact of intermediate relay and the normally-closed contact of A.C. contactor on power supply all the way, all the way
It is directly connected to change-over switch (1KK), another way is connected by intermediate relay normally-closed contact on change-over switch (1KK) and another power supply
The series circuit of formation.
3. a kind of transformer Cooling control cabinet main power supply automatic switching loop as claimed in claim 1 or 2, feature exist
In the change-over switch (1KK) on the power supply all the way is equipped with the first contact (1) and the second contact (2) and the 7th contact (7)
With the 8th contact (8), the change-over switch (1KK) on another way power supply is equipped with third contact (3) and the 4th contact (4) and the 5th
Contact (5) and the 6th contact (6)；All the way when power work, the first contact (1) and the second contact (2) of change-over switch (1KK),
5th contact (5) and the 6th contact (6) are respectively turned on, third contact (3) and the 4th contact (4), the 7th contact (7) and the 8th touching
Point (8) remains open respectively；When another way power work, the third contact (3) of change-over switch (1KK) and the 4th contact (4),
Seven contacts (7) and the 8th contact (8) are respectively turned on, the first contact (1) and the second contact (2), the 5th contact (5) and the 6th contact
(6) it remains open respectively.
4. a kind of transformer Cooling control cabinet main power supply automatic switching loop as described in claim 1, which is characterized in that institute
State per power supply all the way on be equipped with 3 firewires, wherein a firewire be separately connected phase sequence protective relay normally opened contact and
The normally opened contact of intermediate relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821418671.XU CN208971236U (en) | 2018-08-31 | 2018-08-31 | A kind of transformer Cooling control cabinet main power supply automatic switching loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821418671.XU CN208971236U (en) | 2018-08-31 | 2018-08-31 | A kind of transformer Cooling control cabinet main power supply automatic switching loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208971236U true CN208971236U (en) | 2019-06-11 |
Family
ID=66754279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821418671.XU Active CN208971236U (en) | 2018-08-31 | 2018-08-31 | A kind of transformer Cooling control cabinet main power supply automatic switching loop |
Country Status (1)
| Country | Link |
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| CN (1) | CN208971236U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829579A (en) * | 2019-11-13 | 2020-02-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A device for two redundant power supply of UPS power supply |
| CN112186887A (en) * | 2020-10-27 | 2021-01-05 | 国网福建省电力有限公司石狮市供电公司 | High-capacity double-switching power supply device and working method thereof |
| CN112187136A (en) * | 2020-08-20 | 2021-01-05 | 中原工学院 | Fire control is discharged fume preferential fan controller |
| CN112271730A (en) * | 2020-10-28 | 2021-01-26 | 浙江佳乐科仪股份有限公司 | Electrical control box for switching main power supply and auxiliary power supply |
| CN113162214A (en) * | 2021-03-12 | 2021-07-23 | 石家庄钢铁有限责任公司 | Device for automatically switching fault state detection control instrument and control mode |
| CN115498755A (en) * | 2022-11-02 | 2022-12-20 | 重庆钢铁股份有限公司 | Monitoring and alarming method for dual-power automatic transfer switch |
-
2018
- 2018-08-31 CN CN201821418671.XU patent/CN208971236U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829579A (en) * | 2019-11-13 | 2020-02-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A device for two redundant power supply of UPS power supply |
| CN112187136A (en) * | 2020-08-20 | 2021-01-05 | 中原工学院 | Fire control is discharged fume preferential fan controller |
| CN112186887A (en) * | 2020-10-27 | 2021-01-05 | 国网福建省电力有限公司石狮市供电公司 | High-capacity double-switching power supply device and working method thereof |
| CN112271730A (en) * | 2020-10-28 | 2021-01-26 | 浙江佳乐科仪股份有限公司 | Electrical control box for switching main power supply and auxiliary power supply |
| CN112271730B (en) * | 2020-10-28 | 2022-06-24 | 浙江佳乐科仪股份有限公司 | Electrical control box for switching main power supply and auxiliary power supply |
| CN113162214A (en) * | 2021-03-12 | 2021-07-23 | 石家庄钢铁有限责任公司 | Device for automatically switching fault state detection control instrument and control mode |
| CN115498755A (en) * | 2022-11-02 | 2022-12-20 | 重庆钢铁股份有限公司 | Monitoring and alarming method for dual-power automatic transfer switch |
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