CN214590611U - System for reducing starting and standby variable air load loss of power plant - Google Patents

System for reducing starting and standby variable air load loss of power plant Download PDF

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Publication number
CN214590611U
CN214590611U CN202120707453.3U CN202120707453U CN214590611U CN 214590611 U CN214590611 U CN 214590611U CN 202120707453 U CN202120707453 U CN 202120707453U CN 214590611 U CN214590611 U CN 214590611U
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standby
starting
transformer
circuit breaker
voltage
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王团结
何信林
兀鹏越
孟颖琪
杨胜林
张文斌
方子朝
倪继文
刘冲
张少鹏
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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Abstract

A system for reducing the empty load loss of a starting transformer and a standby transformer of a power plant comprises the starting transformer and a high-voltage station transformer; the high-voltage side of the starting-standby transformer is connected with a starting-standby transformer high-voltage side circuit breaker, and the low-voltage side of the starting-standby transformer is connected with a starting-standby incoming line circuit breaker; the high-voltage side of the high-voltage station transformer is connected with a high-voltage side circuit breaker of the high-voltage station transformer, and the low-voltage side of the high-voltage station transformer is connected with a station incoming line circuit breaker; the startup transformer is connected with the high-voltage substation transformer protection cabinet through the fast switching device, the startup transformer is connected with the service bus through the service incoming line breaker and the service incoming line breaker, and the startup transformer is connected with the service bus through the fast switching device. The utility model discloses a cooperation reduction of excitation surge current inhibitor and fast cutting device is equipped with the running loss that becomes the air cooling device with the running loss that becomes the spare space-time load loss of warm reserve.

Description

System for reducing starting and standby variable air load loss of power plant
Technical Field
The utility model relates to a power generation side technical field of system, concretely relates to system for reducing power plant and starting to become empty and carry loss.
Background
The starting and standby of the power plant always adopts the running state of hot standby, firstly, no-load loss exists, secondly, for most power plants, the starting and standby of the power plant uses industrial electricity purchased by a power grid, the electricity price is higher than the self-electricity consumption in the plant, obvious electricity price difference exists, and if the starting and standby of the power plant is changed into cold standby, the economic benefit is obvious. However, the starting-up transformer relates to the safe operation of the service power, and the hot standby operation has higher reliability; the starting-up is changed into a cold standby operation mode, so that no-load loss is reduced, but the operation risk is increased.
Disclosure of Invention
In order to overcome above technical problem, the utility model aims to provide a system for reducing power plant start-up becomes empty and carries loss, can reduce transformer self no-load loss and cooling system's running loss through the cold reserve mode of messenger's start-up transformer adoption on the one hand, and on the other hand can guarantee the safety and stability of factory power supply system, can not adopt cold reserve mode and increase hidden danger because of start-up transformer.
In order to realize the purpose, the utility model discloses a technical scheme is:
a system for reducing the air load loss of a starting device of a power plant comprises a high-voltage station transformer 4, wherein the high-voltage side of the high-voltage station transformer 4 is connected with a high-voltage side circuit breaker 5 of the high-voltage station transformer, the low-voltage side of the high-voltage station transformer is connected with a station incoming line circuit breaker 6, and information of electric quantity and non-electric quantity on the high-voltage station transformer 4 is collected through a high-voltage station transformer protection cabinet 8;
the high-voltage side of the starting-standby transformer 1 is connected with a starting-standby transformer high-voltage side circuit breaker 2, the low-voltage side of the starting-standby transformer is connected with a starting-standby incoming line circuit breaker 3, and the information of the electric quantity and the non-electric quantity on the starting-standby transformer 1 is collected through a starting-standby transformer protection cabinet 7;
the starting transformer protection cabinet 7 and the high-voltage station transformer protection cabinet 8 are both connected with a fast switching device 9, and the fast switching device 9 is connected with an excitation inrush current suppressor 10.
The standby inlet wire breaker 2 and the factory inlet wire breaker 6 are connected with a factory bus 12, and the standby air-to-air cooling device 11 is arranged on the fast switching device 9.
And a protection action outlet of the starting-standby transformer substation protection cabinet 7 is connected with the starting-standby transformer substation high-voltage side circuit breaker 2, and an information alarm outlet is connected with the fast switching device 9.
And a protection action outlet of the high-voltage station transformer protection cabinet 8 is connected with a high-voltage side circuit breaker 5 of the high-voltage station transformer, and an information alarm outlet is connected with a quick-switching device 9.
And an automatic switching-on instruction of the starting-standby variable high-voltage side circuit breaker 2 of the quick switching device 9 passes through the excitation inrush current suppressor 10 and then is output to the starting-standby variable high-voltage side circuit breaker 2.
And the fast switching device 9 sends a switching-on/off command to the standby incoming line breaker 3 and the service incoming line breaker 6.
And the switch auxiliary contacts of the starting-standby transformer high-voltage side circuit breaker 2, the standby incoming line circuit breaker 3 and the service incoming line circuit breaker 6 are connected into the quick switching device 9.
The utility model has the advantages that:
the utility model discloses a cooperation of excitation surge suppressor and fast cutting device to cutting the device function soon and perfect, can reliably realize starting to be equipped with and trun into cold reserve by hot reserve, and start opening and stop of becoming the forced air cooling plant by cutting device control soon, reduce and start to be equipped with the running loss that becomes the forced air cooling plant with the space-time load loss of becoming the forced air cooling plant when reserve.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1: the utility model provides a system for reduce power plant and start and be equipped with empty loss of carrying that becomes, is become 1 including starting to be equipped with, starts to be equipped with and becomes high voltage side circuit breaker 2, reserve inlet wire circuit breaker 3, fast cutting device 9, excitation surge suppressor 10, start to be equipped with and become air cooling plant 11, start to be equipped with and become protection cabinet 7, transformer 4 for the high-voltage plant, transformer high-voltage side circuit breaker 5 for the high-voltage plant, inlet wire circuit breaker 6 for the plant, transformer protection cabinet 8 for the high-voltage plant, bus 12 for the plant.
The high-voltage side of the starting-standby transformer substation 1 is connected with a starting-standby transformer substation high-voltage side circuit breaker 2, and the low-voltage side of the starting-standby transformer substation standby incoming line circuit breaker 3. The high-voltage side of the high-voltage station transformer 4 is connected with a high-voltage side breaker 5 of the high-voltage station transformer, and the low-voltage side of the high-voltage station transformer is connected with a station incoming line breaker 6. The starting-standby transformer substation protection cabinet 7 collects information of electric quantity and non-electric quantity of the starting-standby transformer substation 1 to perform logic judgment, a protection action outlet is connected with the starting-standby transformer substation high-voltage side circuit breaker 2, and an information alarm outlet is connected with the fast switching device 9. The high-voltage station transformer protection cabinet 8 collects the information of the electric quantity and the non-electric quantity of the high-voltage station transformer 4 to carry out logic judgment, the protection action outlet is connected with the high-voltage side circuit breaker 5 of the high-voltage station transformer, and the information alarm outlet is connected with the quick-switching device 9. The magnetizing inrush current suppressor 10 collects the information of the electric quantity of the starting-standby transformer 1 to carry out logic judgment, and an automatic switching-on instruction of the starting-standby transformer high-voltage side circuit breaker 2 of the quick switching device 9 passes through the magnetizing inrush current suppressor 10 and then is output to the starting-standby transformer high-voltage side circuit breaker 2. The fast switching device 9 collects the electric quantity information of the high-voltage station transformer 4 and the starting-standby transformer 1, collects the information alarm outlets of the starting-standby transformer protection cabinet 7 and the high-voltage station transformer protection cabinet 8 to perform comprehensive logic judgment, and sends a switching-on/off command to the starting-standby incoming line breaker 3 and the station incoming line breaker 6.
And the switch auxiliary contacts of the standby transformer high-voltage side circuit breaker 2, the standby incoming line circuit breaker 3 and the service incoming line circuit breaker 6 are connected into the quick-switching device 9. The quick-cut device 9 can send starting and stopping instructions to the starting variable air cooling device 11. The standby incoming line circuit breaker 2 and the service incoming line circuit breaker 6 are connected with a service bus 12.
The magnetizing inrush current suppressor 10 can effectively suppress the magnitude of the magnetizing inrush current through the voltage angle of the no-load closing of the transformer. The main principle is as follows: the waveform of the voltage of the external power supply of the transformer is consistent with that of the main magnetic flux, but leads 90 degrees, so that the waveform of the main magnetic flux can be obtained by measuring the waveform of the voltage, and the polarity of residual magnetism during power failure can be obtained by measuring the waveform of the power failure voltage. Then the closing time of the circuit breaker is controlled, so that the polarities of bias magnetism and residual magnetism generated when the transformer is in no-load power-on are opposite, and the bias magnetism and the residual magnetism act together with stable magnetic flux, so that the total magnetic flux is lower than the saturated magnetic flux of the transformer, the inrush current can be restrained, and the condition that the starting-standby transformer differential protection is mistakenly operated due to the fact that excitation inrush current is generated by impacting the starting-standby transformer can be prevented.
The fast switching device 9 is distinguished through the position contact of starting and standby changing high-voltage side circuit breaker 2 and starting and standby changing inlet wire circuit breaker 3, only when starting and standby changing high-voltage side circuit breaker 2 and starting and standby changing inlet wire circuit breaker 3 are all closed, a starting instruction is sent to the starting and standby changing air cooling device 11 to cool a starting and standby changing oil way, and the starting and standby changing cold standby or hot standby is small in calorific value due to the fact that no load current exists, and cooling can be omitted.
A method of reducing power plant startup empty load loss, comprising the steps of:
step 1, the startup and standby transformer 1 is in a cold standby state, the high-voltage station transformer 4 is in a working state, and the startup and standby air cooling device 11 is in a stop state. When the switching is manually started, the alarm signal of the standby-transformer-free protection cabinet 7 is confirmed, and the fast switching device 9 executes the parallel automatic switching. Firstly, a switching-on instruction of a standby transformer high-voltage side circuit breaker 2 is sent to an excitation inrush current suppressor 10 for judgment, the excitation inrush current suppressor 10 judges that the switching-on time controls switching-on of the standby transformer high-voltage side circuit breaker 2, a fast switching device 9 receives an auxiliary contact of the standby transformer high-voltage side circuit breaker 2 and then judges that the switching-on instruction of a standby incoming line circuit breaker 3 is sent, the standby incoming line circuit breaker 6 is automatically tripped after being lined correctly, if the standby transformer high-voltage side circuit breaker 2 and the standby incoming line circuit breaker 3 are switched on due to time-out (parallel automatic tripping time delay) but not tripped, the fast switching device 9 starts a decoupling function, the standby transformer air cooling device is started after the standby transformer high-voltage side circuit breaker 2 and the standby incoming line circuit breaker 3 are both switched on, and a standby bus transfer 12 is powered by a standby transformer 1.
Step 2, the starting transformer 1 is a cold standby, the high-voltage station transformer is in a working state, the starting transformer air-cooling device 11 is in a stop state, when the manual starting switching is carried out, no alarm signal of the starting transformer protection cabinet 7 is confirmed, the fast switching device 9 executes the parallel semi-automatic switching, firstly, a switching-on command of the starting transformer high-voltage side circuit breaker 2 is sent to the excitation surge suppressor 10 for judgment, the excitation surge suppressor 10 judges the switching-on time to control the switching-on of the starting transformer high-voltage side circuit breaker 2, the fast switching device 9 judges that the command of the switching-on standby incoming line circuit breaker 3 is sent after receiving the auxiliary contact of the starting transformer high-voltage side circuit breaker 2, the manual switching-off of the station incoming line circuit breaker 6 is waited after the parallel correct time delay is carried out, if the switching-on is not carried out due to overtime (parallel semi-automatic tripping delay), the fast switching device 9 starts a decoupling function, the starting transformer air-cooling device is started after the starting of the switching-on standby incoming line circuit breaker 2 and the standby incoming line breaker 3 are confirmed to be switched in, the station bus 12 is supplied with power by the starting-up transformer 1;
step 3, the standby is changed into 1 hot standby, the high-voltage station transformer 4 is in a working state, the standby air-cooling device 11 is in a stop state, an alarm signal of the standby-variable protection cabinet 7 is confirmed, when the switching is manually started, the alarm signal of the standby-variable protection cabinet 7 is confirmed, the fast switching device 9 executes automatic parallel switching, firstly, an instruction of switching the standby incoming line breaker 3 is sent, the station incoming line breaker 6 is automatically tripped in a parallel correct time delay mode, if the station incoming line breaker 6 is overtime (parallel automatic tripping time delay) and is not tripped, the fast switching device 9 starts a decoupling function, the standby air-cooling device is started after the standby high-voltage side breaker 2 and the standby incoming line breaker 3 are both switched in, and the station bus 12 is powered by the standby transformer 1;
step 4, the standby transformer 1 is in a hot standby state, the high-voltage station transformer is in a working state, the standby transformer air cooling device 11 is in a stop state, an alarm signal of a protection cabinet 7 without the standby transformer is confirmed, when the switching is manually started, the alarm signal of the protection cabinet 7 without the standby transformer is confirmed, the fast switching device 9 executes semi-automatic parallel switching, firstly, an instruction of switching the standby incoming line breaker 3 is sent, the standby incoming line breaker 3 is parallelly and correctly delayed to wait for manually tripping the station incoming line breaker 6 without error, if the standby incoming line breaker 2 and the standby incoming line breaker 3 are overtime (parallel semi-automatic tripping delay) and do not trip, the fast switching device 9 starts a decoupling function, the standby transformer air cooling device is started after the standby high-voltage side breaker 2 and the standby incoming line breaker 3 are both switched in, and the station bus 12 is supplied with power by the standby transformer 1;
step 5, the starting transformer 1 is in a cold standby state, the high-voltage station transformer is in a working state, the starting transformer air-cooling device 11 is in a stop state, when manual starting switching is carried out, no alarm signal of the starting transformer protection cabinet 7 is confirmed, the fast switching device 9 executes series switching, the station incoming line circuit breaker 6 is tripped, then a switching-on instruction of the starting transformer high-voltage side circuit breaker 2 is sent to the excitation inrush current suppressor 10 for judgment, the excitation inrush current suppressor 10 judges switching-on time to control the switching-on of the starting transformer high-voltage side circuit breaker 2, the fast switching device 9 judges switching-on after receiving an auxiliary contact of the starting transformer high-voltage side circuit breaker 2 and judges that switching conditions are met, an instruction of the switching-on standby incoming line circuit breaker 3 is sent, the starting transformer air-cooling device is started after the starting transformer high-voltage side circuit breaker 2 and the incoming line circuit breaker 3 are both switched on, and the station transformer 1 is used for supplying power;
step 6, the starting-up transformer 1 is in a cold standby state, the high-voltage station transformer is in a working state, the starting-up air-cooling device 11 is in a stop state, when manual starting switching is carried out, an alarm signal of a protection cabinet 7 without the starting-up transformer is confirmed, the fast switching device 9 executes series switching, the station incoming line circuit breaker 6 is tripped, then a command of closing the standby incoming line circuit breaker 3 is sent out after the switching condition is judged to be met, the starting-up air-cooling device is started after the starting-up high-voltage side circuit breaker 2 and the standby incoming line circuit breaker 3 are both closed, and the station bus 12 is supplied with power by the starting-up transformer 1;
step 7, the startup and standby transformer 1 is in a cold standby state, the high-voltage station transformer is in a working state, the startup and standby air cooling device 11 is in a stop state, when the switching is manually started, the alarm signal of the backup transformer protection cabinet 7 is confirmed to be absent, the fast switching device 9 executes fast (synchronous and residual voltage) switching, firstly the service incoming line breaker 6 is tripped, then, a switching-on instruction of the standby transformer high-voltage side circuit breaker 2 is sent to the excitation inrush current suppressor 10 for judgment, the excitation inrush current suppressor 10 judges the switching-on time to control switching-on of the standby transformer high-voltage side circuit breaker 2, the fast switching device 9 receives an auxiliary contact of the standby transformer high-voltage side circuit breaker 2, judges the switching-on and sends an instruction of switching-on the standby incoming line circuit breaker after judging that the switching-on condition is met, the standby transformer wind cooling device is started after the standby transformer high-voltage side circuit breaker 2 and the standby incoming line circuit breaker 3 are confirmed to be switched in, and the plant bus 12 is supplied with power by the standby transformer 1;
step 8, the starting-up transformer 1 is in a cold standby state, the high-voltage station transformer is in a working state, the starting-up air-cooling device 11 is in a stop state, when manual starting switching is carried out, an alarm signal of a starting-up transformer protection cabinet 7 is confirmed, the fast switching device 9 carries out fast (synchronous and residual voltage) switching, the station incoming line breaker 6 is tripped, an instruction of switching the standby incoming line breaker 3 is sent out after the switching condition is judged to be met, the starting-up air-cooling device is started after the starting-up high-voltage side breaker 2 and the standby incoming line breaker 3 are both switched in, and the station bus 12 is supplied with power by the starting-up transformer 1;
step 9, the starting-up transformer 1 is in a cold standby state, the high-voltage station transformer is in a working state, the starting-up transformer air cooling device 11 is in a stop state, when the high-voltage station transformer protection cabinet 7 performs protection action to start the fast switching device 9 or the station bus 12 is low-voltage due to switch tripping to start the fast switching device 9, an alarm signal of the non-starting-up transformer protection cabinet 7 is confirmed, firstly, an instruction for tripping the station incoming line circuit breaker 6 is sent, then, an instruction for starting the standby high-voltage side circuit breaker 2 is sent to the excitation inrush current suppressor 10 for judgment, the excitation inrush current suppressor 10 judges that the switching-on time is controlled to be switched into the starting-up transformer high-voltage side circuit breaker 2, the fast switching device 9 judges that the switching-on is carried out after receiving an auxiliary contact of the starting-up transformer high-voltage side circuit breaker 2 and judging that switching-on conditions are met, then, an instruction for switching-on the standby incoming line circuit breaker 3 is sent out, the starting-up transformer air cooling device is started after both the starting-up transformer high-voltage side circuit breaker 2 and the standby incoming line breaker 3 are switched into, the station bus 12 is supplied with power by the starting-up transformer 1;
step 10, after the startup transformer 1 is in a working state, the high-voltage station transformer is in a hot standby state, the startup transformer air cooling device 11 is in a working state, and the fast switching device 9 is manually started, confirming that no alarm signal of the high-voltage station transformer protection cabinet 8 exists, the fast switching device 9 executes parallel switching, firstly sending an instruction of the station service incoming line breaker 6, automatically tripping off the standby incoming line breaker 3 after the parallel operation is correct, if the device is overtime (parallel automatic tripping delay) and not tripped, the quick switching device 9 starts a decoupling function, sends an instruction of stopping starting the standby variable air cooling device after confirming the standby incoming line breaker 3, the plant bus 12 is supplied with power by the high-voltage plant transformer, the standby transformer 1 is hot standby, and when the standby is required to be changed into cold standby, the starting-standby transformer high-voltage side circuit breaker 2 is manually tripped, and other switching modes such as parallel semi-automatic, series and simultaneous switching steps can be performed according to the reference.
The electric quantity logic of the fast switching device 9 is not modified, and the delay setting in the fixed value can be verified and set according to the actual on-load test, so that the power loss of the important auxiliary machine in the auxiliary power switching process is avoided. In order to prevent the switching failure caused by the self fault of the transformer when the standby is started and changed into the cold standby state, the transformer can be enhanced to be patrolled and periodically switched into the working state manually, and the operation can be changed into the hot standby state in severe weather or at the same time.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A system for reducing the air load loss of starting and standby of a power plant is characterized by comprising a high-voltage station transformer (4), wherein the high-voltage side of the high-voltage station transformer (4) is connected with a high-voltage side circuit breaker (5) of the high-voltage station transformer, the low-voltage side of the high-voltage station transformer is connected with a station incoming line circuit breaker (6), and the information of electric quantity and non-electric quantity on the high-voltage station transformer (4) is collected through a high-voltage station transformer protection cabinet (8);
the high-voltage side of the starting-standby transformer (1) is connected with a starting-standby high-voltage side circuit breaker (2), the low-voltage side of the starting-standby transformer is connected with a starting-standby incoming line circuit breaker (3), and the information of the electric quantity and the non-electric quantity on the starting-standby transformer (1) is collected through a starting-standby transformer protection cabinet (7);
the starting transformer protection cabinet (7) and the high-voltage station transformer protection cabinet (8) are both connected with a fast switching device (9), and the fast switching device (9) is connected with an excitation inrush current suppressor (10).
2. The system for reducing the open-air load loss of the starting and standby of the power plant according to claim 1, characterized in that the starting and standby incoming line breaker (3) and the service incoming line breaker (6) are connected with a service bus (12), and the starting and standby air cooling device (11) is arranged on the fast switching device (9).
3. The system for reducing the empty load loss of the starting and standby transformer of the power plant as claimed in claim 1, characterized in that a protection action outlet of the starting and standby transformer protection cabinet (7) is connected with the starting and standby high voltage side circuit breaker (2), and an information alarm outlet is connected with the fast switching device (9).
4. The system for reducing the air load loss of the starting and standby of the power plant according to claim 1, wherein a protection action outlet of the high-voltage station transformer protection cabinet (8) is connected with a high-voltage side circuit breaker (5) of the high-voltage station transformer, and an information alarm outlet is connected with a quick switching device (9).
5. The system for reducing the loss of the starting and standby empty load of the power plant according to claim 1, wherein the automatic closing command of the starting and standby high-voltage side circuit breaker (2) of the fast switching device (9) passes through the magnetizing inrush current suppressor (10) and then is exported to the starting and standby high-voltage side circuit breaker (2).
6. The system for reducing the loss of the starting-standby and idling loads of the power plant as claimed in claim 1, wherein the fast switching device (9) sends a switching-on and switching-off command to be exported to the starting-standby incoming line breaker (3) and the service incoming line breaker (6).
7. The system for reducing the loss of the starting and standby transformer no-load of the power plant according to claim 1, characterized in that the switch auxiliary contact access fast-switching device (9) of the starting and standby transformer high-voltage side circuit breaker (2), the standby incoming line circuit breaker (3) and the service incoming line circuit breaker (6).
CN202120707453.3U 2021-04-08 2021-04-08 System for reducing starting and standby variable air load loss of power plant Active CN214590611U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120707453.3U CN214590611U (en) 2021-04-08 2021-04-08 System for reducing starting and standby variable air load loss of power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120707453.3U CN214590611U (en) 2021-04-08 2021-04-08 System for reducing starting and standby variable air load loss of power plant

Publications (1)

Publication Number Publication Date
CN214590611U true CN214590611U (en) 2021-11-02

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Application Number Title Priority Date Filing Date
CN202120707453.3U Active CN214590611U (en) 2021-04-08 2021-04-08 System for reducing starting and standby variable air load loss of power plant

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CN (1) CN214590611U (en)

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