CN210692296U - Main transformer cooling control system - Google Patents
Main transformer cooling control system Download PDFInfo
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- CN210692296U CN210692296U CN201921646050.1U CN201921646050U CN210692296U CN 210692296 U CN210692296 U CN 210692296U CN 201921646050 U CN201921646050 U CN 201921646050U CN 210692296 U CN210692296 U CN 210692296U
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- 238000001816 cooling Methods 0.000 title claims abstract description 117
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000498 cooling water Substances 0.000 claims description 28
- 238000004891 communication Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 3
- 239000003999 initiator Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 15
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 238000004804 winding Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000002354 daily effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
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Abstract
The utility model discloses a main transformer cooling control system, the main transformer adopts forced oil circulation water cooling mode, the whole cooling system comprises a unit local unit LCU control layer, a main transformer high-pressure cooling PLC control layer and an execution layer device; when the unit is started, the unit is stopped and the main transformer high-voltage transformer stops running based on the equipment parts, the main transformer high-voltage transformer adopts a corresponding running mode. The utility model discloses a based on generator monitoring flow design, need cooperate work such as group's electrical switch with unit technology water supply system and generator-transformer simultaneously, reform transform the upgrading cost low. The method can be guided by a monitoring process and exchange information with a PLC of the main transformer cooling system to complete condition judgment adaptive to main transformer no-load conversion, and realize the switching of the working modes of the cooling system.
Description
Technical Field
The utility model belongs to the technical field of the cooling of pumped storage unit main transformer, concretely relates to main transformer cooling control system.
Background
The main transformer (called main transformer for short) is the main equipment of the power plant, and its safe, stable and healthy operation is the goal pursued by professional operation and maintenance personnel of the power plant, and for the transformer, the most important is heat dissipation and cooling. The starting times and starting modes of the pumped storage unit are variable, the main transformer can be frequently switched between no-load and load, and a cooling system of the main transformer also needs to adaptively change the operation mode, so that the temperature stability of the transformer is ensured.
SUMMERY OF THE UTILITY MODEL
The utility model provides a main cooling system control method that becomes, based on the design of generator control flow, simultaneously need with unit technical water supply system and the cooperation work such as generator and transformer group electrical switch. The method can realize that the system is guided by a monitoring process and exchanges information with the PLC of the main transformer cooling system, finishes condition judgment suitable for main transformer no-load conversion and realizes the working mode switching of the cooling system.
The technical scheme adopted for realizing the purpose is as follows: a main transformer cooling control system adopts a forced oil circulation water cooling mode, and the whole cooling system comprises a unit local unit (LCU) control layer, a main transformer high-voltage device cooling PLC control layer and execution layer equipment.
The unit local unit LCU: the unit set comprises all local PLC or control centers of execution equipment including cooling control management of a main transformer high-voltage device, is a demand initiator for operation control of a main transformer cooling system and is responsible for coordination control with other systems, and an industrial personal computer of the unit local control unit is in communication connection with the main transformer cooling system PLC through a hard wiring or a modbus.
The main transformer high-voltage transformer cooling system PLC: and the LCU of the local control unit of the upper bearing unit issues each execution layer device, is responsible for controlling the cooling device and checking the execution effect, feeds the execution result back to the LCU of the local control unit of the upper bearing unit, and is connected with the execution layer device through I/O (input/output) hard wiring.
An execution layer device: when the main transformer high-voltage device cooling system PLC judges that the main transformer high-voltage device cooling system is in no-load, cooling water is controlled to be supplied to the main transformer high-voltage device cooling system in a pressurized mode through a main transformer no-load cooling water pump PO1 by public water supply, 1 cooler is started to operate, the main transformer no-load cooling water pump is started in a no-load cooling mode, and the standby no-load cooling water pump PO2 is started when the no-load cooling water pump PO1 fails.
Further, when the main transformer high-voltage transformer cooling system PLC judges the load of the main transformer high-voltage transformer, cooling water is controlled to be supplied by the technical water supply pump of the unit generator set, 2 coolers are started to operate, and the operation is carried out in a load cooling mode.
Further, when the cooling system PLC judges the main transformer overhaul state, the cooler RF, the idle cooling water pump PO1, and the spare idle cooling water pump PO2 are stopped.
And the execution layer equipment feeds the self state and the execution result back to the cooling system PLC to complete closed-loop control.
Further, the system comprises a unit technical water supply pump PO, a main transformer high-voltage device low-pressure side switch Q0, a main transformer high-voltage device side disconnecting link, a main transformer high-voltage device cooler group RF, a pipeline and a manual valve thereof.
The method for operating the main transformer from no load to load when the unit is started based on the above equipment components comprises the following steps.
Executing step 1: and executing a starting sequence control flow in the local control unit LCU controller of the unit, and executing a step 2 after sending a starting command.
And step 2: the local control unit LCU controller starts a unit technical water supply pump PO; after the step 2 is executed, a monitoring program in the local control unit LCU controller judges whether the load condition of the main transformer is met, and when the load condition of the main transformer is met, the local control unit LCU sends a main transformer load signal to the main transformer cooling system PLC in a hard wiring or modbus communication mode; and after the main transformer cooling system PLC receives a main transformer load signal, executing a step 3.
Step 3: the main transformer cooling system PLC stops a main transformer no-load pump PO1 and simultaneously starts a 2 nd main transformer cooler RF 2; the main transformer temperature will rise steadily with the load running time until the winding temperature reaches 75 ℃, and the main transformer cooling system PLC executes step 4.
And step 4: the main transformer cooling system PLC starts a 3 rd main transformer cooler RF 3; when 3 coolers work, the temperature of the main transformer gradually falls back until the winding temperature reaches 65 ℃, and the PLC of the main transformer cooling system executes a step 5.
Step 5: the main transformer cooling system PLC controls to stop the work of the 3 rd cooler RF 3; during the load operation of the main transformer, the main transformer cooling system PLC circularly operates in a step sequence 4 and a step sequence 5 according to the temperature, and is controlled by the main transformer cooling system PLC, and the rest step sequences are controlled by the local control unit LCU.
The method for turning the main transformer from load to idle running when the unit is shut down based on the above equipment parts comprises the following steps.
Executing step 1: and executing a shutdown sequence control process in the LCU controller of the local control unit of the unit, and executing a step 2 when the sequence control process is executed to stop the auxiliary machine after a shutdown command is sent out.
And step 2: the unit local control unit LCU controller stops the unit technical water supply pump PO; after the step 2 is executed, a monitoring program in the local control unit LCU controller judges the on-off condition of the main transformer load, and when the on-off condition is met, the local control unit LCU sends a main transformer no-load signal to the main transformer cooling system PLC in a hard wiring or modbus communication mode; and after the main transformer cooling system PLC receives a main transformer no-load signal, executing a step 3.
Step 3: the main transformer cooling system PLC starts a main transformer no-load pump PO1, simultaneously stops 1 cooler, and then the main transformer enters a no-load running state; in the main transformer no-load operation stage, if a main transformer no-load pump PO1 fault occurs, the main transformer cooling system PLC executes a step 4.
And step 4: the main transformer cooling system PLC starts a main transformer idle standby pump PO 2; when the main transformer no-load pump PO1 is cleared and the equipment status is restored to be available, the main transformer cooling system PLC executes step 5.
Step 5: the main transformer cooling system PLC starts a main transformer no-load pump PO1 and stops a main transformer no-load backup pump PO 2; during the no-load running period of the main transformer, the no-load pump and the standby pump circularly run in a step sequence 4 and a step sequence 5, and are controlled by a main transformer cooling system PLC, and the rest step sequences are controlled by an on-site control unit LCU.
The main transformer shutdown process operation method comprises the following steps: when the main transformer cooling system PLC detects a main transformer load disconnection condition, the main transformer is judged to be stopped, then the main transformer cooling system PLC controls and stops the main transformer no-load pump PO1, the main transformer no-load backup pump PO2 and the 4 coolers to work, namely the cooling system stops running.
Further, step 2 is executed, when the unit technical water supply pump PO is started, the auxiliary machine systems are started.
Wherein, the judgment of the main transformer load closing condition after the step 2 is executed in the step (1) means that the knife switch at the high-pressure side of the main transformer is closed and the technical water supply pump PO is in the running state, and when the 2 conditions are all met, the local control unit LCU sends a main transformer load signal to the main transformer cooling system PLC in a hard wiring or modbus communication mode.
Wherein, the judgment of the main transformer load on-off condition after the step 2 is executed in the step (2) means that the knife switch at the high-pressure side of the main transformer is closed and the technical water supply pump PO is in a stop state, and when the 2 conditions are all met, the local control unit LCU sends a main transformer no-load signal to the main transformer cooling system PLC in a hard wiring or modbus communication mode.
Wherein, the judgment of the main transformer load disconnection condition (3) means that when the main transformer high-voltage side disconnecting link is in the disconnection state and the main transformer low-voltage side switch Q0 is in the disconnection state, the main transformer cooling system PLC controls to stop the main transformer no-load pump PO1, controls to stop the main transformer no-load backup pump PO2 and controls to stop the 4 coolers from working in RF.
Has the advantages that: the utility model discloses a based on the design of generator control flow, need cooperate work such as group's electrical switch with unit technology water supply system and generation and transformation simultaneously. The system comprises a unit Local Control Unit (LCU), a main transformer cooling control system, a cooler, a cooling water pump and the like, which are existing equipment of a power plant, new equipment does not need to be added basically, and the transformation and upgrading cost is low. Through the utility model discloses the main change cooling system that the method upgraded can be through the control flow guide to exchange information with main change cooling system PLC, accomplish the condition judgement that suits with main change no-load conversion, realize that cooling system working method switches.
Drawings
FIG. 1 is a control schematic diagram of a main transformer cooling system during a unit start-up process.
FIG. 2 is a schematic diagram of the control of the main transformer cooling system during unit shutdown.
Fig. 3 is a control schematic of the main transformer shutdown cooling system.
Detailed Description
The cooling mode of the main transformer adopts forced oil circulation water cooling. When the main transformers are in no-load, cooling water is supplied by whole plant public water supply through the main transformer no-load pump in a pressurizing mode, and 1 cooler is started to operate (each main transformer is provided with a set of coolers, and the coolers are formed by connecting 4 coolers in parallel). When the main transformer load is changed, cooling water is supplied by the technical water supply pump of the unit generator set, and 2 coolers are started to operate.
Specifically, the main transformer adopts a forced oil circulation water cooling mode, and the whole cooling system is completed by the upper and lower cooperation of an LCU control layer of a unit local unit, a PLC control layer of the cooling system and an execution layer device. The local unit LCU of the unit is a control center of all local PLCs or execution equipment of the unit including main transformer cooling control management, is a requirement initiator of the main transformer cooling system operation control and is responsible for coordination control with other systems, and the industrial personal computer of the local unit control unit of the unit is in communication connection with the main transformer cooling system PLC through a hard wiring or modbus. Wherein the cooling system PLC bears the unit local control unit LCU on the unit, assigns each and carries out layer equipment, is responsible for controlling cooling device and checks the execution effect to carry out the result and feed back to higher level LCU, pass through IO hard wire with carrying out layer equipment and be connected, accomplish by a complete PLC equipment. An execution layer device: when the cooling system PLC judges that the main transformer is in no-load, cooling water is controlled to be supplied by whole plant public water supply through the main transformer no-load cooling water pump PO1 in a pressurized mode, 1 cooler is started to operate (a priority RF1 cooler is started) and enters a no-load cooling mode to operate, and the standby no-load cooling water pump PO2 is started when the no-load cooling water pump PO1 fails; when the cooling system PLC judges a main transformer load, cooling water is controlled to be supplied by a technical water supply pump of the unit generator set, 2 coolers are started to operate (the priority RF1 and the priority RF2 coolers are started) and then the unit generator set enters a load cooling mode to operate; when the cooling system PLC judges the maintenance state of the main transformer, stopping the cooler RF, the no-load cooling water pump PO1 and the standby no-load cooling water pump PO 2; and the execution layer equipment feeds the self state and the execution result back to the cooling system PLC to complete closed-loop control.
Because the pumped storage unit is frequently started daily, the main transformer can be subjected to no-load and load-no-load conversion operation for many times every day, and the main transformer is periodically overhauled to form three operation modes, so that the project provides solutions for the management of the working modes of the cooling system under the three operation modes respectively. The control system relates to a device comprising: the system comprises a unit on-site control unit LCU, a unit technical water supply pump PO, a main transformer low-voltage side switch Q0 (namely a generator outlet switch GCB), a main transformer high-voltage side disconnecting link Q91, a main transformer cooling system PLC, a main transformer cooler group (formed by connecting four coolers in parallel) RF, an idle load cooling water pump PO1, a standby idle load cooling water pump PO2, necessary pipelines and manual valves thereof and the like. The following describes a cooling system control method for each of the above three operation modes.
1) The unit starting-main transformer is in a no-load to load operation process. The control principle of a main transformer cooling system in the starting process of the unit is shown in figure 1, namely: executing a starting sequence control flow in an LCU controller of a unit local control unit, sending a starting order, executing a step 2 (starting each auxiliary machine system), and starting a technical water supply pump at the moment; after the step 2 is executed, the monitoring program in the local control unit LCU controller judges that 2 conditions of 'closing the main transformer high-pressure side disconnecting link Q91' and 'operating the technical water supply pump PO' are met, and then the local control unit LCU sends a 'main transformer load' signal to the main transformer cooling system PLC in a hard wiring or modbus communication mode; after receiving a 'main transformer load' signal, a main transformer cooling system PLC executes a step sequence 3 'stop main transformer no-load pump PO 1' and 'start a 2 nd cooler' in the principle diagram 1; along with the running time of a load, the temperature of a main transformer can rise stably until the temperature of a winding reaches 75 ℃, and a main transformer cooling system PLC executes a step 4 'to start a cooler 3' in a principle diagram 1; when 3 coolers work, the temperature of the main transformer can gradually fall back, and when the winding temperature reaches 65 ℃, the PLC of the main transformer cooling system executes a step 5 'of stopping the 3 rd cooler' in the schematic diagram 1; during the operation of main transformer load, a main transformer cooling system PLC operates in a step sequence 4 and a step sequence 5 according to temperature circulation, as shown in a schematic diagram; the dotted box part in fig. 1 is realized by the control of a main transformer cooling system PLC and is realized by the control of an in-situ control unit LCU.
2) The unit is stopped, and a main transformer is in no-load operation from load. The control principle of the main transformer cooling system in the unit shutdown process is shown in fig. 2, namely: executing a shutdown sequence control flow in an LCU controller of a unit local control unit, and executing a step 2 'stopping a technical water supply pump PO' in a schematic diagram 2 when an auxiliary machine is stopped after a shutdown command is sent out and the sequence control flow is executed; after the step 2 is executed, a monitoring program in the local control unit LCU controller judges that 2 conditions of 'closing the main transformer high-pressure side disconnecting link Q91' and 'stopping the technical water supply pump PO' are met, and then the local control unit LCU sends a 'main transformer no-load' signal to a main transformer cooling system PLC in a hard wiring or modbus communication mode; after receiving the main transformer no-load signal, the main transformer cooling system PLC executes step 3 of starting a main transformer no-load pump PO1 and stopping 1 cooler in the principle diagram 2, and then the main transformer enters an no-load running state; in the main transformer no-load operation stage, if a main transformer no-load pump PO1 fault occurs, the main transformer cooling system PLC executes a step sequence 4 'of starting a main transformer no-load backup pump PO 2' in the schematic diagram 2; when the main transformer no-load pump PO1 is cleared and the equipment state is recovered to be available, the main transformer cooling system PLC executes a step sequence 5 'starting the main transformer no-load pump PO 1' and 'stopping the main transformer no-load standby pump PO 2' in the schematic diagram 2; during the no-load operation of the main transformer, the no-load pump and the standby pump circularly operate in a step sequence 4 and a step sequence 5, as shown in a schematic diagram; in fig. 2, the dotted frame part is realized by the control of a main transformer cooling system PLC and is realized by the control of an in-situ control unit LCU.
3) And (5) stopping the main transformer. The control principle of the cooling system when the main transformer is shut down is shown in figure 3, namely: when the main transformer cooling system PLC detects that 2 conditions that 'the main transformer high-voltage side disconnecting link Q91 is disconnected' and 'the main transformer low-voltage side switch Q0 is disconnected' are simultaneously met, the main transformer is judged to be stopped, then the PLC controls to open 'stop the main transformer no-load pump PO 1', 'stop the main transformer no-load backup pump PO 2' and 'stop 4 coolers RF', namely the cooling system is stopped from running.
Claims (5)
1. A main transformer cooling control system is characterized in that a main transformer adopts a forced oil circulation water cooling mode, and the whole cooling system comprises a unit local unit LCU control layer, a main transformer high-voltage device cooling PLC control layer and execution layer equipment;
the unit local unit LCU: the unit is a control center of all local PLC or execution equipment of the unit set, is a requirement initiator of the operation control of the main transformer cooling system and is responsible for coordination control with other systems, and an industrial personal computer of the unit local control unit is in communication connection with the main transformer cooling system PLC through a hard wiring or a modbus; the main transformer high-voltage transformer cooling system PLC: the local control unit LCU of the upper bearing unit issues each execution layer device, is responsible for controlling the cooling device and checking the execution effect, feeds the execution result back to the local control unit LCU of the upper bearing unit, and is connected with the execution layer device through I/O hard wiring;
an execution layer device: when the main transformer high-voltage device cooling system PLC judges that the main transformer high-voltage device cooling system is in no-load, cooling water is controlled to be supplied to the main transformer high-voltage device cooling system in a pressurized mode through a main transformer no-load cooling water pump PO1 by public water supply, 1 cooler is started to operate, the main transformer no-load cooling water pump is started in a no-load cooling mode, and the standby no-load cooling water pump PO2 is started when the no-load cooling water pump PO1 fails.
2. The main transformer cooling control system of claim 1, wherein when the main transformer cooling system PLC determines the load of the main transformer, the PLC controls the cooling water to be supplied by the technical water supply pump of the generator set of this unit, and starts the 2 coolers to operate, and then enters the load cooling mode to operate.
3. The main transformer cooling control system of claim 1, wherein the cooling system PLC stops the cooler RF, the unloaded cooling water pump PO1 and the standby unloaded cooling water pump PO2 when determining a main transformer maintenance status.
4. The cooling control system of the main transformer of claim 1, wherein the executive layer device feeds back the self state and the executive result to the cooling system PLC to complete the closed-loop control.
5. The main transformer cooling control system of claim 1, further comprising a unit technical water supply Pump (PO), a main transformer low-pressure side switch (Q0), a main transformer side disconnecting link, a main transformer cooler set (RF), piping and manual valves thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921646050.1U CN210692296U (en) | 2019-09-29 | 2019-09-29 | Main transformer cooling control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921646050.1U CN210692296U (en) | 2019-09-29 | 2019-09-29 | Main transformer cooling control system |
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| Publication Number | Publication Date |
|---|---|
| CN210692296U true CN210692296U (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921646050.1U Active CN210692296U (en) | 2019-09-29 | 2019-09-29 | Main transformer cooling control system |
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|---|---|
| CN (1) | CN210692296U (en) |
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2019
- 2019-09-29 CN CN201921646050.1U patent/CN210692296U/en active Active
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