Automatic operation process of a water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system

Abstract

The present invention discloses an automatic operation process of a water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system. A new function is added to the original computer monitoring system control screen: the water-cooled outdoor standby main transformer cooler startup and shutdown function, which is realized by remote commanding through an internal LCU program. An operation command can be sent in the monitoring system to complete the startup and shutdown functions of the standby main transformer cooler. Various conditions that require manual inspection and confirmation are automatically realized in the process, making the startup and shutdown operations of the water-cooled standby main transformer cooler more convenient and safer. Compared with the previous traditional startup and shutdown operation methods of the standby main transformer cooler, it is more convenient and safer, greatly reduces the probability of misoperation, and ensures the safe and reliable operation of the hydropower station.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring and operating electric equipment in a hydroelectric power plant, and in particular to an automatic operation process of a start-up and shutdown monitoring system for a water-cooled outdoor standby main transformer cooler. Background Art

[0002] The water-cooled outdoor standby main transformer cooler is easy to freeze and damage the cooler pipes in low temperature weather. To prevent the above situation from happening, anti-freezing measures should be taken for the standby main transformer cooler when the ambient temperature is low. The water-cooled outdoor standby main transformer cooler needs to be started for a period of time and then shut down to circulate the water in the cooler or drain the water in the cooler. The specific process is: 1. Manually check whether a series of conditions for starting the main transformer cooler are met; 2. The monitoring system remotely issues an order to close the water inlet valve of the pressure reducing valve of the technical water supply system unit; 3. The monitoring system remotely issues an order to start the main transformer cooler; 4. The monitoring system remotely issues an order to open the technical water supply electric main valve, and the main transformer cooler runs for a period of time; 5. The monitoring system remotely issues an order to close the technical water supply electric main valve; 6. The monitoring system remotely issues an order to shut down the main transformer cooler; 7. The monitoring system remotely issues an order to open the water inlet valve of the pressure reducing valve of the technical water supply system unit.

[0003] Based on this, the current water-cooled outdoor standby main transformer cooler needs to be started for a period of time and then shut down in low temperature weather. The hydropower station operators perform single operations on the monitoring system to gradually complete the start-up and shutdown operations of the water-cooled outdoor standby main transformer cooler. Disadvantages of the above specific process:

[0004] (1) The step-by-step operation process increases the amount of operations that operators have to do on the monitoring system, which in turn increases the rate of misoperation and poses safety risks;

[0005] (2) When there are a large number of water-cooled outdoor power transformers on standby at the same time, the operating personnel need to perform antifreeze operations on the main transformer coolers one by one, and before and after each operation step, the operator needs to check whether the relevant equipment is in operation and whether the corresponding conditions are met, which greatly reduces the operating efficiency;

[0006] (3) The current monitoring system's automatic operation process for starting and shutting down the water-cooled outdoor standby main transformer cooler is relatively complex, as is the internal LCU command procedure. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides an automatic operation process of a water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system. By adding a control function module to the original computer monitoring system screen, the automatic operation process of starting and shutting down the water-cooled outdoor standby main transformer cooler can be completed with one click. The invention optimizes the previous operation process of the standby main transformer cooler startup and shutdown monitoring system, adds internal logic judgment functions, reduces the number of equipment operation items, improves operating efficiency, and reduces the probability of misoperation.

[0008] In order to realize the above-mentioned technical features, the purpose of the present invention is achieved as follows: an automatic operation process of a water-cooled outdoor standby main transformer cooler start-up and shutdown monitoring system, by adding a new function in the monitoring system control interface: the water-cooled outdoor standby main transformer cooler start-up and shutdown function, which is realized by remote command through the internal LCU program, and the standby main transformer cooler start-up and shutdown function can be completed by sending an operation command in the monitoring system.

[0009] The automatic operation process of the water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system is as follows:

[0010] Step 1: When receiving the operation command to start the water-cooled outdoor standby main transformer cooler, it automatically checks whether the starting conditions are met: the generator is shut down, the main transformer is shut down, the main transformer cooler is fault-free, the main transformer cooler oil pump control mode is remote, the unit cooling water control mode is remote, the unit technical water supply electric main valve is fully closed, the unit cooling water system unit pressure reducing valve water inlet electric valve is fully open, and the technical water supply system and related valves are in normal status; if they are met, the operation process proceeds to the next step 2; if not, an alarm is issued and the operation process is exited;

[0011] Step 2: remotely issue a command to close the water inlet valve of the pressure reducing valve of the technical water supply system unit, and automatically monitor the closing state of the water inlet valve of the pressure reducing valve; if the conditions are met, the automatic operation process proceeds to the next step 3; if not, it prompts that the operation failed and alarms to exit the operation process;

[0012] Step 3: remotely start the main transformer cooler and automatically monitor that the oil pumps of the main transformer cooler are running normally and the water valves of the main transformer cooler are opening normally; if the conditions are met, the automatic operation process proceeds to the next step 4; if not, the operation fails and an alarm is issued to exit the operation process;

[0013] Step 4: After the operation process of step 3 is completed, a delay of T1 is given, and a remote command is issued to open the technical water supply electric main valve, and the cooling water flow of the main transformer cooler is automatically monitored to see if it is normal; if the conditions are met, the automatic operation process proceeds to the next step 5; if not, the operation fails and an alarm is given to exit the operation process;

[0014] Step 5: After step 4 runs normally for a period of time T2, a remote command is issued to close the technical water supply electric main valve, and the cooling water flow of the main transformer cooler is automatically monitored to see if it is normal; if the conditions are met, the automatic operation process proceeds to the next step 6; if not, the operation fails and an alarm is issued to exit the operation process;

[0015] Step 6: remotely issue a command to shut down the main transformer cooler, and automatically monitor that the oil pumps of the main transformer cooler are shut down normally and the water valve of the main transformer cooler is in normal state; if the conditions are met, the automatic operation process proceeds to the next step 7; if not, it prompts that the operation failed and an alarm is issued to exit the operation process;

[0016] Step 7: remotely issue a command to open the water inlet valve of the pressure reducing valve of the technical water supply system unit, and automatically monitor the opening status of the water inlet valve of the pressure reducing valve; if the conditions are met, the process ends; if not, it prompts that the operation fails and issues an alarm to exit the operation process;

[0017] Step 8: Remotely and automatically monitor the status of the water supply valves of the cooling water system of each unit and adjust them to the normal standby state to ensure that the unit startup conditions are met; if not, an alarm signal is issued.

[0018] The value of T1 in step 4 is determined according to the optimal operating conditions and can be adjusted as needed.

[0019] The value of T2 in step 5 is the required operating time of the cooler and can be adjusted as needed.

[0020] In the computer monitoring, a "water-cooled outdoor main transformer cooler start-up and shutdown automatic operation permission" light is designed to automatically determine whether the main transformer cooler start-up and shutdown monitoring system automatic operation process is available;

[0021] Only when the following eight conditions are met: the generator is shut down, the main transformer is shut down, the main transformer cooler is fault-free, the main transformer cooler oil pump control mode is remote, the unit cooling water control mode is remote, the unit technical water supply electric main valve is fully closed, the unit cooling water system unit pressure reducing valve water inlet electric valve is fully open, and the technical water supply system and related valves are in normal state, the light will be on to remind the operator to operate with one key;

[0022] The technical water supply system and related valves are in normal condition, which means that the status of related equipment and valves are maintained at the status before the unit is put into operation, and the unit will not change during normal start-up and shutdown. In step three, the cooler oil pump is started first and the main transformer cooler water valve is opened to prevent the water hammer effect in the main transformer cooler pipeline after the main valve of the cooling water supply system is directly opened, thereby damaging the equipment. The operation in step five is to prevent the pipeline from being pressurized and damaging the equipment after the main transformer cooler water valve is closed, and then the main valve of the cooling water supply system is closed first.

[0023] Beneficial effects of the present invention:

[0024] The present invention solves the problems of complex process, complex monitoring operation process and high probability of misoperation in the startup and shutdown process of the traditional water-cooled outdoor standby main transformer cooler through new system process optimization. The control logic is modified and a control function module is added to the original computer monitoring system screen, which can complete the automatic process of the startup and shutdown monitoring system of the water-cooled outdoor standby main transformer cooler with one button, and has better practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a logic diagram for allowing automatic operation of starting and stopping the water-cooled outdoor main transformer cooler of the present invention.

[0027] Figure 2 The present invention discloses an automatic operation flow chart of a water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0029] Embodiment 1:

[0030] See also Figure 1-2 , an automatic operation process of a water-cooled outdoor standby main transformer cooler start-up and shutdown monitoring system, by adding a new function in the monitoring system control interface: water-cooled outdoor standby main transformer cooler start-up and shutdown function, through the internal LCU program remote command to achieve, can send an operation command in the monitoring system to complete the standby main transformer cooler start-up and shutdown function.

[0031] Furthermore, the automatic operation process of the water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system is as follows:

[0032] Step 1: When receiving the operation command to start the water-cooled outdoor standby main transformer cooler, it automatically checks whether the starting conditions are met: the generator is shut down, the main transformer is shut down, the main transformer cooler is fault-free, the main transformer cooler oil pump control mode is remote, the unit cooling water control mode is remote, the unit technical water supply electric main valve is fully closed, the unit cooling water system unit pressure reducing valve water inlet electric valve is fully open, and the technical water supply system and related valves are in normal status; if they are met, the operation process proceeds to the next step 2; if not, an alarm is issued and the operation process is exited;

[0033] Step 2: remotely issue a command to close the water inlet valve of the pressure reducing valve of the technical water supply system unit, and automatically monitor the closing state of the water inlet valve of the pressure reducing valve; if the conditions are met, the automatic operation process proceeds to the next step 3; if not, it prompts that the operation failed and alarms to exit the operation process;

[0034] Step 3: remotely start the main transformer cooler and automatically monitor that the oil pumps of the main transformer cooler are running normally and the water valves of the main transformer cooler are opening normally; if the conditions are met, the automatic operation process proceeds to the next step 4; if not, the operation fails and an alarm is issued to exit the operation process;

[0035] Step 4: After the operation process of step 3 is completed, a delay of T1 is given, and a remote command is issued to open the technical water supply electric main valve, and the cooling water flow of the main transformer cooler is automatically monitored to see if it is normal; if the conditions are met, the automatic operation process proceeds to the next step 5; if not, the operation fails and an alarm is given to exit the operation process;

[0036] Step 5: After step 4 runs normally for a period of time T2, a remote command is issued to close the technical water supply electric main valve, and the cooling water flow of the main transformer cooler is automatically monitored to see if it is normal; if the conditions are met, the automatic operation process proceeds to the next step 6; if not, the operation fails and an alarm is issued to exit the operation process;

[0037] Step 6: remotely issue a command to shut down the main transformer cooler, and automatically monitor that the oil pumps of the main transformer cooler are shut down normally and the water valve of the main transformer cooler is in normal state; if the conditions are met, the automatic operation process proceeds to the next step 7; if not, it prompts that the operation failed and an alarm is issued to exit the operation process;

[0038] Step 7: remotely issue a command to open the water inlet valve of the pressure reducing valve of the technical water supply system unit, and automatically monitor the opening status of the water inlet valve of the pressure reducing valve; if the conditions are met, the process ends; if not, it prompts that the operation fails and issues an alarm to exit the operation process;

[0039] Step 8: Remotely and automatically monitor the status of the water supply valves of the cooling water system of each unit and adjust them to the normal standby state to ensure that the unit startup conditions are met; if not, an alarm signal is issued.

[0040] The value of T1 in step 4 is determined according to the optimal operating conditions and can be adjusted as needed.

[0041] The value of T2 in step 5 is the required operating time of the cooler and can be adjusted as needed.

[0042] In the computer monitoring, a "water-cooled outdoor main transformer cooler start-up and shutdown automatic operation permission" light is designed to automatically determine whether the main transformer cooler start-up and shutdown monitoring system automatic operation process is available;

[0043] Only when the following eight conditions are met: the generator is shut down, the main transformer is shut down, the main transformer cooler is fault-free, the main transformer cooler oil pump control mode is remote, the unit cooling water control mode is remote, the unit technical water supply electric main valve is fully closed, the unit cooling water system unit pressure reducing valve water inlet electric valve is fully open, and the technical water supply system and related valves are in normal state, the light will be on to remind the operator to operate with one key;

[0044] The technical water supply system and related valves are in normal condition, which means that the status of related equipment and valves are maintained at the status before the unit is put into operation, and the unit will not change during normal start-up and shutdown. In step three, the cooler oil pump is started first and the main transformer cooler water valve is opened to prevent the water hammer effect in the main transformer cooler pipeline after the main valve of the cooling water supply system is directly opened, thereby damaging the equipment. The operation in step five is to prevent the pipeline from being pressurized and damaging the equipment after the main transformer cooler water valve is closed, and then the main valve of the cooling water supply system is closed first.

Claims

1. An automatic operation process of a water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system, characterized in that: By adding a new function in the monitoring system control interface: the start-up and shutdown function of the water-cooled outdoor standby main transformer cooler, it can be realized by sending a remote command through the internal LCU program. The start-up and shutdown function of the standby main transformer cooler can be completed by sending an operation command in the monitoring system; The automatic operation process of the water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system is as follows: Step 1: When receiving the operation command to start the water-cooled outdoor standby main transformer cooler, it automatically checks whether the starting conditions are met: the generator is shut down, the main transformer is shut down, the main transformer cooler is fault-free, the main transformer cooler oil pump control mode is remote, the unit cooling water control mode is remote, the unit technical water supply electric main valve is fully closed, the unit cooling water system unit pressure reducing valve water inlet electric valve is fully open, and the technical water supply system and related valves are in normal status; if they are met, the operation process proceeds to the next step 2; if not, an alarm is issued and the operation process is exited; Step 2: remotely issue a command to close the water inlet valve of the pressure reducing valve of the technical water supply system unit, and automatically monitor the closing state of the water inlet valve of the pressure reducing valve; if the conditions are met, the automatic operation process proceeds to the next step 3; if not, it prompts that the operation failed and alarms to exit the operation process; Step 3: remotely start the main transformer cooler and automatically monitor that the oil pumps of the main transformer cooler are operating normally and the water valve of the main transformer cooler is opening normally; If the conditions are met, the automatic operation process proceeds to the next step four; if not, it prompts that the operation failed and an alarm is issued to exit the operation process; Step 4: After the operation process of step 3 is completed, a delay of T1 is given, and a remote command is issued to open the technical water supply electric main valve, and the cooling water flow of the main transformer cooler is automatically monitored to see if it is normal; if the conditions are met, the automatic operation process proceeds to the next step 5; if not, the operation fails and an alarm is given to exit the operation process; Step 5: After step 4 runs normally for a period of time T2, a remote command is issued to close the technical water supply electric main valve, and the cooling water flow of the main transformer cooler is automatically monitored to see if it is normal; if the conditions are met, the automatic operation process proceeds to the next step 6; if not, the operation fails and an alarm is issued to exit the operation process; Step 6: remotely issue a command to shut down the main transformer cooler, and automatically monitor that the oil pumps of the main transformer cooler are shut down normally and the water valve of the main transformer cooler is in normal state; if the conditions are met, the automatic operation process proceeds to the next step 7; If not, the system will prompt that the operation failed and issue an alarm to exit the operation process; Step 7: remotely issue a command to open the water inlet valve of the pressure reducing valve of the technical water supply system unit, and automatically monitor the opening status of the water inlet valve of the pressure reducing valve; if the conditions are met, the process ends; if not, it prompts that the operation fails and issues an alarm to exit the operation process; Step 8: Remotely and automatically monitor the status of the water supply valves of the cooling water system of each unit and adjust them to the normal standby state to ensure that the unit startup conditions are met; if not, an alarm signal is issued.

2. According to claim 1, the automatic operation process of the water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system is characterized in that: The value of T1 in step 4 is determined according to the optimal operating conditions and can be adjusted as needed.

3. The automatic operation process of the water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system according to claim 1 is characterized in that: The value of T2 in step 5 is the required operating time of the cooler and can be adjusted as needed.

4. The automatic operation process of the water-cooled outdoor standby main transformer cooler startup and shutdown monitoring system according to claim 1 is characterized in that: In the computer monitoring, the "water-cooled outdoor main transformer cooler start-up and shutdown automatic operation permission" light is designed to automatically determine whether the main transformer cooler start-up and shutdown monitoring system automatic operation process is allowed; Only when the following eight conditions are met: the generator is shut down, the main transformer is shut down, the main transformer cooler is fault-free, the main transformer cooler oil pump control mode is remote, the unit cooling water control mode is remote, the unit technical water supply electric main valve is fully closed, the unit cooling water system unit pressure reducing valve water inlet electric valve is fully open, and the technical water supply system and related valves are in normal state, the light will be on to remind the operator to operate with one key; The technical water supply system and related valves are in normal condition, which means that the status of related equipment and valves are maintained at the status before the unit is put into operation, and the unit will not change during normal start-up and shutdown. In step three, the cooler oil pump is started first and the main transformer cooler water valve is opened to prevent the water hammer effect in the main transformer cooler pipeline after the main valve of the cooling water supply system is directly opened, thereby damaging the equipment. The operation in step five is to prevent the pipeline from being pressurized and damaging the equipment after the main transformer cooler water valve is closed, and then the main valve of the cooling water supply system is closed first.

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