CN112909941A - System and method for reducing starting and standby variable air load loss of power plant - Google Patents
System and method for reducing starting and standby variable air load loss of power plant Download PDFInfo
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- CN112909941A CN112909941A CN202110375171.2A CN202110375171A CN112909941A CN 112909941 A CN112909941 A CN 112909941A CN 202110375171 A CN202110375171 A CN 202110375171A CN 112909941 A CN112909941 A CN 112909941A
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- 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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
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- 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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
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Abstract
A system and method for reducing the empty load loss of a starting-standby transformer of a power plant comprises the starting-standby 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 power supply and non-power information is collected through a startup transformer protection cabinet, the high-voltage substation transformer power supply and non-power information is collected through the high-voltage substation transformer protection cabinet, the startup transformer protection cabinet and the high-voltage substation transformer protection cabinet are connected with an excitation inrush current suppressor through a fast switching device, a startup transformer standby incoming line breaker and a substation incoming line breaker are connected with a substation bus, and a startup and stop startup transformer air cooling device is arranged on the fast switching device. The invention reduces the time-load loss when the backup is started and becomes hot for standby and the running loss of the backup becomes air cooling device by matching the excitation surge suppressor with the quick-cutting device.
Description
Technical Field
The invention relates to the technical field of power generation side systems, in particular to a system and a method for reducing the air load loss of starting and standby of a power plant.
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 the technical problems, the invention aims to provide a system and a method for reducing the idle load loss of a startup and standby transformer of a power plant, which can reduce the no-load loss of a transformer and the running loss of a cooling system by enabling the startup and standby transformer to adopt a cold standby mode on one hand, and can ensure the safety and stability of a plant power supply system on the other hand, and cannot increase hidden dangers due to the adoption of the cold standby mode by the startup and standby transformer.
In order to achieve the purpose, the invention adopts the technical scheme that:
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 4, the low-voltage side of the high-voltage station transformer 4 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 protection cabinet 8 of the high-voltage station transformer 4;
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 4 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 a protection cabinet 8 of the high-voltage station transformer 4 is connected with a high-voltage side circuit breaker 5 of the high-voltage station transformer 4, 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.
A use method of a system for reducing the air load loss of starting and standby of a power plant comprises the following steps;
step 1, a starting transformer 1 is in a cold standby state, a high-voltage station transformer 4 is in a working state, a starting transformer air cooling device 11 is in a stop state, when manual starting switching is carried out, no warning signal of a starting transformer protection cabinet 7 is confirmed, a fast switching device 9 carries out parallel automatic switching, firstly, a switching-on command of a starting transformer high-voltage side circuit breaker 2 is sent to an 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 a switching-on standby incoming line circuit breaker 3 is sent after receiving an auxiliary contact of the starting transformer high-voltage side circuit breaker 2, the incoming line circuit breaker 6 for automatic switching-on is delayed after parallel correctness is achieved, if overtime (parallel automatic tripping time delay) does not occur, the fast switching device 9 starts a decoupling function, the starting transformer air cooling device is started after the starting transformer air cooling device confirms that both the starting transformer high-voltage side circuit breaker 2 and the, the station bus 12 is supplied with power by the starting-up transformer 1;
step 4, the starting-up transformer 1 is in a hot standby state, the high-voltage station transformer 4 is in a working state, the starting-up transformer air cooling device 11 is in a stop state, an alarm signal of a protection cabinet 7 without the starting-up transformer is confirmed, when the switching is manually started, the alarm signal of the protection cabinet 7 without the starting-up transformer is confirmed, the fast switching device 9 executes semi-automatic parallel switching, firstly, an instruction of closing the standby incoming line breaker 3 is sent, the parallel accurate delay is waited for manually jumping off the station incoming line breaker 6, if the time is out (the parallel semi-automatic tripping delay) and the switching is not jumped, the fast switching device 9 starts a decoupling function, the starting-up transformer air cooling device is started after the starting-up transformer high-voltage side breaker 2 and the standby incoming line breaker 3 are both closed, and the station transformer 1 is powered by the bus 12;
step 6, the starting-up transformer 1 is in a cold standby state, the high-voltage station transformer 4 is in a working state, the starting-up air-cooling device 11 is in a stop state, when manual starting switching is performed, an alarm signal of the starting-up 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 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 4 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;
The invention has the beneficial effects that:
the invention can reliably realize the change from hot standby to cold standby by matching the excitation surge suppressor with the fast switching device and perfecting the function of the fast switching device, and the fast switching device controls the start and stop of the start-up air-cooling device, thereby reducing the time load loss during the change from hot standby to cold standby and the running loss of the start-up air-cooling device.
Drawings
Fig. 1 is a schematic structural view 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, becomes 1 including starting to be equipped with, start to be equipped with and become high voltage side circuit breaker 2, reserve inlet wire circuit breaker 3, cut device 9 soon, 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 high-pressure side circuit breaker 5, service inlet wire circuit breaker 6, transformer 4 for the high-voltage plant protection cabinet 8, service generating line 12.
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 circuit breaker 5 of the high-voltage station transformer 4, and the low-voltage side of the high-voltage station transformer is connected with a station incoming line circuit 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 protection cabinet 8 of the high-voltage station transformer 4 collects information of electric quantity and non-electric quantity of the high-voltage station transformer 44 to carry out logic judgment, a protection action outlet is connected with a high-voltage side circuit breaker 5 of the high-voltage station transformer 4, and an 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 substation transformer 44 and the starting-standby transformer 1, collects the information alarm outlets of the starting-standby transformer protection cabinet 7 and the high-voltage substation transformer 4 protection cabinet 8 to perform comprehensive logic judgment, and sends a switching-on/off command outlet to the starting-standby transformer standby incoming line breaker 3 and the substation 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.
step 4, the starting-up transformer 1 is in a hot standby state, the high-voltage station transformer 4 is in a working state, the starting-up transformer air cooling device 11 is in a stop state, an alarm signal of a protection cabinet 7 without the starting-up transformer is confirmed, when the switching is manually started, the alarm signal of the protection cabinet 7 without the starting-up transformer is confirmed, the fast switching device 9 executes semi-automatic parallel switching, firstly, an instruction of closing the standby incoming line breaker 3 is sent, the parallel accurate delay is waited for manually jumping off the station incoming line breaker 6, if the time is out (the parallel semi-automatic tripping delay) and the switching is not jumped, the fast switching device 9 starts a decoupling function, the starting-up transformer air cooling device is started after the starting-up transformer high-voltage side breaker 2 and the standby incoming line breaker 3 are both closed, and the station transformer 1 is powered by the bus 12;
step 6, the starting-up transformer 1 is in a cold standby state, the high-voltage station transformer 4 is in a working state, the starting-up air-cooling device 11 is in a stop state, when manual starting switching is performed, an alarm signal of the starting-up 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 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 4 is in a working state, the startup and standby transformer air cooling device 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 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;
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 (8)
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 (4), 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 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 (2) 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).
8. The use method of the system for reducing the standby empty load loss of the power plant according to any one of claims 1 to 7 is characterized by comprising the following steps;
step 1, a starting-standby transformer (1) is in a cold standby state, a high-voltage station transformer (4) is in a working state, a starting-standby air cooling device (11) is in a stop state, when manual starting switching is carried out, an alarm signal of a non-starting-standby transformer protection cabinet (7) is confirmed, a fast switching device (9) executes parallel automatic switching, firstly, a switching-on instruction of a starting-standby transformer high-voltage side circuit breaker (2) is sent to an excitation surge suppressor (10) for judgment, switching-on time is judged by the excitation surge suppressor (10) to control the switching-on of the starting-standby transformer high-voltage side circuit breaker (2), the fast switching device (9) judges that switching-on is carried out after receiving an auxiliary contact of the starting-standby transformer high-voltage side circuit breaker (2) and then sends an instruction of switching-on the standby incoming line circuit breaker (3), the station incoming line circuit breaker (6) is automatically tripped after error is correct, if switching-on is exceeded, the fast switching device (9) starts a decoupling function, and the starting-on switching-off function is confirmed after The backup air cooling device is characterized in that a station bus (12) is supplied with power by a backup transformer (1);
step 2, the starting transformer (1) is in a cold standby state, the high-voltage station transformer (4) 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, an alarm signal of a non-starting transformer protection cabinet (7) is confirmed, the fast switching device (9) executes the parallel semi-automatic switching, firstly, a switching-on instruction 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 switching-on instruction of the switching-on standby incoming line circuit breaker (3) is sent after receiving an auxiliary contact of the starting transformer high-voltage side circuit breaker (2), the fast switching device waits for the manual tripping of the station incoming line circuit breaker (6) after the parallel correctness is carried out, and if the switching-on is carried out, the fast switching, after the starting standby high-voltage side circuit breaker (2) and the standby incoming line circuit breaker (3) are confirmed to be closed, the starting standby air cooling device is started, and the station bus (12) is supplied with power by the starting standby transformer (1);
step 3, the starting-standby transformer (1) is in a hot standby state, the high-voltage station transformer (4) is in a working state, the starting-standby transformer air-cooling device (11) is in a stop state, an alarm signal of a non-starting-standby transformer protection cabinet (7) is confirmed, when the switching is manually started, the alarm signal of the non-starting-standby transformer protection cabinet (7) is confirmed, the fast switching device (9) executes automatic parallel switching, firstly, an instruction of closing the standby incoming line breaker (3) is sent, the station incoming line breaker (6) is automatically tripped out in a parallel correct and time-free delaying mode, if the station incoming line breaker (6) is overtime and not tripped out, the fast switching device (9) starts a decoupling function, the starting-standby transformer air-cooling device is started after the starting-standby high-voltage side incoming line breaker (2) and the standby incoming line breaker (3) are both closed, and the station bus (;
step 4, the starting-standby transformer (1) is in a hot standby state, the high-voltage station transformer (4) is in a working state, the starting-standby transformer air-cooling device (11) is in a stop state, an alarm signal of a non-starting-standby transformer protection cabinet (7) is confirmed, when the switching is manually started, the alarm signal of the non-starting-standby transformer protection cabinet (7) is confirmed, the quick switching device (9) executes semi-automatic parallel switching, firstly, an instruction of closing the standby incoming line breaker (3) is sent, the manual tripping of the station incoming line breaker (6) is accurately delayed and waited for, if the condition is exceeded, the station incoming line breaker is not tripped, the quick switching device (9) starts a decoupling function, the starting-standby transformer air-cooling device is started after the starting-standby high-voltage side incoming line breaker (2) and the standby incoming line breaker (3) are both closed, and the station bus (12) is powered;
step 5, the starting-standby transformer (1) is in a cold standby state, the high-voltage station transformer (4) is in a working state, the starting-standby air cooling device (11) is in a stop state, when the manual starting switching is performed, an alarm signal of a non-starting-standby transformer protection cabinet (7) is confirmed, the fast switching device (9) performs series switching, the station incoming line breaker (6) is tripped, then a switching-on instruction of the starting-standby transformer high-voltage side 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 the switching-on of the starting-standby transformer high-voltage side breaker (2), the fast switching device (9) judges the switching-on state after receiving an auxiliary contact of the starting-standby transformer high-voltage side breaker (2) and sends an instruction of switching-on the standby incoming line breaker (3) after judging that the switching conditions are met, and the starting-standby transformer air cooling device is started after the starting-standby transformer high-voltage side breaker (2, the factory bus (12) is supplied with power by the starting-standby transformer (1);
step 6, the starting-standby transformer (1) is in a cold standby state, the high-voltage station transformer (4) is in a working state, the starting-standby transformer air cooling device (11) is in a stop state, when manual starting switching is carried out, an alarm signal of a non-starting-standby transformer protection cabinet (7) is confirmed, the quick switching device (9) executes series switching, the station incoming line circuit breaker (6) is tripped, then a command of switching the standby incoming line circuit breaker (3) is sent out after the switching condition is judged to be met, the starting-standby transformer air cooling device is started after the starting-standby transformer high-voltage side circuit breaker (2) and the standby incoming line circuit breaker (3) are both switched in, and the station bus (12) is supplied with power by the starting-standby transformer (1);
step 7, the starting-up transformer (1) is in a cold standby state, the high-voltage station transformer (4) is in a working state, the starting-up transformer air cooling device (11) is in a stop state, when manual starting switching is carried out, an alarm signal of a non-starting-up transformer protection cabinet (7) is confirmed, the fast switching device (9) carries out fast switching, firstly, the station incoming line circuit breaker (6) is tripped, then a switching-on instruction of the starting-up 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 the switching-on of 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 judges that the switching-on condition is met, then the switching-on instruction of the switching-up transformer incoming line circuit breaker is sent, and the starting, the factory bus (12) is supplied with power by the starting-standby transformer (1);
step 8, the starting-standby transformer (1) is in a cold standby state, the high-voltage station transformer (4) is in a working state, the starting-standby transformer air cooling device (11) is in a stop state, when manual starting switching is carried out, an alarm signal of a non-starting-standby transformer protection cabinet (7) is confirmed, the quick switching device (9) executes quick switching, the station incoming line circuit breaker (6) is tripped, then a command of switching the standby incoming line circuit breaker (3) is sent out after the switching condition is judged to be met, the starting-standby transformer air cooling device is started after the starting-standby transformer high-voltage side circuit breaker (2) and the standby incoming line circuit breaker (3) are both switched in, and the station bus (12) is supplied with power by the starting-standby transformer (1);
step 9, the starting-standby transformer (1) is in a cold standby state, the high-voltage station transformer (4) is in a working state, the starting-standby 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 starting-standby transformer protection cabinet (7) is confirmed, firstly, an instruction of tripping the station incoming line breaker (6) is issued, then, a switching-on instruction of the standby transformer high-voltage side breaker (2) is issued to the excitation inrush current suppressor (10) for judgment, switching-on of the standby transformer high-voltage side breaker (2) is controlled by judging the excitation inrush current suppressor (10) when switching-on, the switching-on auxiliary contact of the starting-standby transformer high-voltage side breaker (2) is judged by the fast switching device (9), switching-on the standby incoming line breaker (3) is judged to be switched on and switching-on, after the starting standby high-voltage side circuit breaker (2) and the standby incoming line circuit breaker (3) are confirmed to be closed, the starting standby air cooling device is started, and the station bus (12) is supplied with power by the starting standby transformer (1);
step 10, the startup transformer (1) is in a working state, the high-voltage station transformer (4) is in a hot standby state, the startup transformer air cooling device (11) is in a working state, after the fast switching device (9) is manually started, an alarm signal of a protection cabinet (8) without the high-voltage station transformer 4 is confirmed, the fast switching device (9) executes parallel switching, firstly, an instruction of switching in the station incoming line breaker (6) is sent, the standby incoming line breaker (3) is automatically tripped after the parallel switching is correct, if the standby incoming line breaker (3) is overtime and not tripped, the fast switching device (9) starts a decoupling function, after the standby incoming line breaker (3) is confirmed, an instruction of stopping the startup transformer air cooling device is sent, the station bus (12) is powered by the high-voltage station transformer (4), the startup transformer (1) is in a hot standby state, when the startup transformer needs to be switched to be in a cold standby state, the startup transformer (2) is manually tripped, and other switching modes are in a parallel connection mode, namely, The steps of serial, simultaneous switching may be referred to.
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