Monitoring system for water cooling system of high-voltage frequency converter

Abstract

The invention belongs to the technical field of power equipment monitoring, and particularly relates to a high-voltage frequency converter water cooling system monitoring system. Comprising a human-computer interface, a PLC 1, a PLC 2, a cooling water flow transmitter A, a pressure transmitter A, a supply water temperature transmitter A, a return water temperature transmitter A, a cooling water flow transmitter B, a pressure transmitter B, a supply water temperature transmitter B and a return water temperature transmitter B, the man-machine interface is connected with the PLC1 and the PLC2, the cooling water flow transmitter A, the pressure transmitter A, the water supply temperature transmitter A and the water return temperature transmitter A are connected with the PLC1, the cooling water flow transmitter B, the pressure transmitter B, the water supply temperature transmitter B and the water return temperature transmitter B are connected with the PLC2, the PLC1 and the PLC2 are connected with the first circulating pump, the second circulating pump, the electric three-way valve and the make-up pump, and the PLC1 and the PLC2 are connected. The monitoring strategy is combined with multi-data judgment, so that misjudgment is avoided; and a double-PLC redundancy monitoring mode is configured in a redundancy manner, so that the monitoring reliability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of power equipment monitoring, and in particular relates to a high-voltage inverter water cooling system monitoring system. Background Art

[0002] In a nuclear power plant, the main pump inverter is a key component of the main pump power supply. The main pump inverter fault tripping will cause the main pump to lose power, resulting in reactor shutdown. The water cooling system is a key component of the fully water-cooled high-voltage inverter. Failures in the water cooling system, such as shutdown of dual pumps, low cooling water flow, low cooling water pressure, etc., will cause the inverter to be unavailable. In order to ensure the stable operation of the inverter, the water cooling system needs to be effectively monitored. The main function of the high-voltage inverter water cooling system monitoring system is to monitor the operating status of the inverter water cooling system and to protect and control the system based on PLC programming. The inverter water cooling system status mainly includes: operating parameter information of the water cooling system and fault alarm information of the water cooling system.

[0003] In the prior art, when a monitoring system is used for monitoring, it is generally based on instrument monitoring operation data. It is impossible to synchronously adjust the functional operation status and response control of the water cooling system based on the comparison of the sampled data and the parameter setting values. The operation and maintenance personnel are required to manually intervene in emergencies, which affects the stable operation of the system.

[0004] Therefore, developing a new type of high-voltage inverter water cooling system monitoring system that can automatically respond to different working conditions is of great significance to improving the operating stability and reliability of the inverter. Summary of the invention

[0005] The purpose of the present invention is to provide a high-voltage inverter water cooling system monitoring system to solve the problem that the inverter monitoring system in the prior art generally communicates with the inverter based on fixed and hard-coded communication data, lacks automatic intervention in unexpected operating conditions on site, and when deviations occur in the on-site operating conditions, manual intervention by operation and maintenance personnel is required, thereby affecting the stable operation of the system.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A high-voltage inverter water cooling system monitoring system comprises a human-machine interface, PLC1, PLC2, a cooling water flow transmitter A, a pressure transmitter A, a water supply temperature transmitter A, a return water temperature transmitter A, a cooling water flow transmitter B, a pressure transmitter B, a water supply temperature transmitter B and a return water temperature transmitter B; the human-machine interface is connected with PLC1 and PLC2, the cooling water flow transmitter A, the pressure transmitter A, the water supply temperature transmitter A and the return water temperature transmitter A are connected with PLC1, the cooling water flow transmitter B, the pressure transmitter B, the water supply temperature transmitter B and the return water temperature transmitter B are connected with PLC2, PLC1 and PLC2 are connected with No. 1 circulation pump, No. 2 circulation pump, an electric three-way valve and a water supply pump, and PLC1 is connected with PLC2.

[0008] When PLC1 receives the data uploaded by cooling water flow transmitter A, it compares it with the cooling water flow ultra-low parameter setting value inside the system and makes a difference. When the difference is less than 0.5 and lasts for more than 2s, PLC1 triggers an alarm signal inside to start the water replenishment pump for water replenishment adjustment and transmits the cooling water flow ultra-low alarm text to the human-machine interface through communication.

[0009] PLC1 receives the data uploaded by pressure transmitter A, and compares it with the low water supply pressure parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, PLC triggers the alarm signal to start the water supply pump for water supply adjustment and transmits the low water supply pressure alarm text to the human-machine interface through communication.

[0010] When PLC1 detects two alarms simultaneously, PLC1 triggers a trip signal to trip the high-voltage inverter.

[0011] The sampling flow of cooling water flow transmitter A is compared with the low cooling water flow parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, an alarm signal is triggered inside PLC1 to start the water replenishment pump for water replenishment adjustment and transmit the low cooling water flow alarm text to the human-machine interface through communication.

[0012] PLC1 receives the data uploaded by pressure transmitter A, compares it with the water supply pressure ultra-low parameter setting value inside the system, and when the difference is less than 0.5 and lasts for more than 2s, PLC1 outputs an alarm signal to start the water supply pump adjustment and transmits the water supply pressure ultra-low alarm text to the human-machine interface through communication.

[0013] When PLC1 detects two alarms simultaneously, PLC1 triggers a trip signal to trip the high-voltage inverter.

[0014] The sampling temperature of water supply temperature transmitter A is compared with the setting value of the cooling water supply temperature over-high parameter inside the system. When the difference is less than 0.5 and lasts for more than 2s, an alarm signal is triggered inside PLC1 to start the electric three-way valve to direct the cooling water to the cold source and transmit the water supply temperature over-high alarm text to the human-machine interface through communication.

[0015] PLC1 receives the data uploaded by return water temperature transmitter A, and compares it with the return water temperature over-high parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, PLC1 outputs an alarm signal and transmits the return water temperature over-high alarm text to the human-machine interface through communication; when PLC1 monitors two alarms at the same time, PLC1 triggers a trip signal to trip the high-voltage inverter.

[0016] When PLC1, cooling water flow transmitter A, pressure transmitter A, supply water temperature transmitter A, and return water temperature transmitter A fail, PLC2, cooling water flow transmitter B, pressure transmitter B, supply water temperature transmitter B, and return water temperature transmitter B start working.

[0017] The beneficial effects achieved by the present invention are:

[0018] The monitoring strategy of the present invention combines multiple data judgments to avoid misjudgment. The redundant configuration of the dual PLC controller redundant monitoring mode improves the reliability of monitoring. Each PLC control loop is equipped with an independent sampling instrument to avoid the failure of the instrument and the sampling signal loop leading to unexpected operating conditions causing shutdown, and has good redundancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The diagram is a schematic diagram of a high-voltage inverter water cooling system monitoring system. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown: a high-voltage inverter water cooling system monitoring system includes: a human-machine interface, PLC1, PLC2, a cooling water flow transmitter A, a pressure transmitter A, a water supply temperature transmitter A, a return water temperature transmitter A, a cooling water flow transmitter B, a pressure transmitter B, a water supply temperature transmitter B and a return water temperature transmitter B; the human-machine interface is connected to PLC1 and PLC2, the cooling water flow transmitter A, the pressure transmitter A, the water supply temperature transmitter A and the return water temperature transmitter A are connected to PLC1, the cooling water flow transmitter B, the pressure transmitter B, the water supply temperature transmitter B and the return water temperature transmitter B are connected to PLC2, PLC1 and PLC2 are connected to No. 1 circulation pump, No. 2 circulation pump, the electric three-way valve and the water supply pump, and PLC1 is connected to PLC2.

[0022] Water cooling trip monitoring project logic: at least two data faults are superimposed, including low cooling water flow and low water supply pressure, high water supply temperature and high return water temperature, low cooling water pressure, low water supply pressure and low flow logic judgment. The control loop adopts a control and protection system based on the configuration of dual PLC redundant controllers: one for use and one for backup, two PLCs have communication, and real-time information interaction is realized to monitor and protect the water cooling system; upload the working status of the water cooling system to the PLC main controller; and automatically control the water cooling system. The system loop is equipped with 2 sampling instruments: including cooling water flow transmitter A, pressure transmitter A, water supply temperature transmitter A, and return water temperature transmitter A in sampling loop one. Cooling water flow transmitter B, pressure transmitter B, water supply temperature transmitter B, and return water temperature transmitter B in sampling loop two. Human-machine interface: using a touch screen, it can display the various monitoring parameters of the water cooling system in real time, can operate and set parameters on the spot, and can display alarm information in real time. When operating on-site, operators can accurately understand the equipment status at any time and avoid mistakes, which is beneficial for maintenance.

[0023] After PLC1 receives the start command, the water cooling system automatically runs, and monitors the water cooling operation status and detects system failures according to the set parameters. PLC automatically adjusts the cooling water temperature and system pressure. If the water cooling system parameters exceed the standard, the preset signal light will light up, and the alarm will be displayed to the human-machine interface through communication; the main circulation pump, electric heater, water supply pump, dosing pump, etc. are automatically monitored by PLC1 according to the actual working conditions.

[0024] When PLC1 receives data uploaded by cooling water flow transmitter A, it compares and subtracts it with the low cooling water flow parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, PLC1 triggers an alarm signal to start the water supply pump for water supply adjustment and transmits the low cooling water flow alarm text to the human-machine interface through communication. When PLC1 receives data uploaded by pressure transmitter A, it compares and subtracts it with the low water supply pressure parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, PLC triggers an alarm signal to start the water supply pump for water supply adjustment and transmits the low water supply pressure alarm text to the human-machine interface through communication. When PLC1 monitors two alarms at the same time, PLC1 triggers a trip signal to trip the high-voltage inverter.

[0025] The sampling flow of cooling water flow transmitter A is compared with the low cooling water flow parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, PLC1 triggers an alarm signal to start the water supply pump for water supply adjustment and transmits the low cooling water flow alarm text to the human-machine interface through communication. PLC1 receives the data uploaded by pressure transmitter A and compares it with the low water supply pressure parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, PLC1 outputs an alarm signal to start the water supply pump adjustment and transmits the low water supply pressure alarm text to the human-machine interface through communication. When two alarms are monitored simultaneously inside PLC1, PLC1 triggers a trip signal to trip the high-voltage inverter.

[0026] The sampling temperature of the water supply temperature transmitter A is compared with the setting value of the cooling water supply temperature over-high parameter in the system. When the difference is less than 0.5 and lasts for more than 2s, an alarm signal is triggered inside PLC1 to start the electric three-way valve to guide the cooling water to the cold source and transmit the alarm text of the water supply temperature over-high to the human-machine interface through communication. PLC1 receives the data uploaded by the return water temperature transmitter A and compares it with the setting value of the return water temperature over-high parameter in the system. When the difference is less than 0.5 and lasts for more than 2s, PLC1 outputs an alarm signal and transmits the alarm text of the return water temperature over-high to the human-machine interface through communication. When two alarms are monitored simultaneously inside PLC1, PLC1 triggers a trip signal to trip the high-voltage inverter.

[0027] When PLC1, cooling water flow transmitter A, pressure transmitter A, supply water temperature transmitter A, and return water temperature transmitter A fail, PLC2, cooling water flow transmitter B, pressure transmitter B, supply water temperature transmitter B, and return water temperature transmitter B start working.

Claims

1. A high-voltage inverter water cooling system monitoring system, characterized in that: It includes a human-machine interface, PLC1, PLC2, cooling water flow transmitter A, pressure transmitter A, water supply temperature transmitter A, return water temperature transmitter A, cooling water flow transmitter B, pressure transmitter B, water supply temperature transmitter B and return water temperature transmitter B; the human-machine interface is connected with PLC1 and PLC2, cooling water flow transmitter A, pressure transmitter A, water supply temperature transmitter A and return water temperature transmitter A are connected with PLC1, cooling water flow transmitter B, pressure transmitter B, water supply temperature transmitter B and return water temperature transmitter B are connected with PLC2, PLC1 and PLC2 are connected with No. 1 circulation pump, No. 2 circulation pump, electric three-way valve and make-up water pump, and PLC1 is connected with PLC2.

2. The high-voltage inverter water cooling system monitoring system according to claim 1 is characterized in that: When PLC1 receives the data uploaded by cooling water flow transmitter A, it compares it with the cooling water flow ultra-low parameter setting value inside the system and makes a difference. When the difference is less than 0.5 and lasts for more than 2s, PLC1 triggers an alarm signal inside to start the water replenishment pump for water replenishment adjustment and transmits the cooling water flow ultra-low alarm text to the human-machine interface through communication.

3. The high-voltage inverter water cooling system monitoring system according to claim 2 is characterized in that: PLC1 receives the data uploaded by pressure transmitter A, and compares it with the low water supply pressure parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, PLC triggers the alarm signal to start the water supply pump for water supply adjustment and transmits the low water supply pressure alarm text to the human-machine interface through communication.

4. The high-voltage inverter water cooling system monitoring system according to claim 3 is characterized in that: When PLC1 detects two alarms simultaneously, PLC1 triggers a trip signal to trip the high-voltage inverter.

5. The high-voltage inverter water cooling system monitoring system according to claim 4 is characterized in that: The sampling flow of cooling water flow transmitter A is compared with the low cooling water flow parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, an alarm signal is triggered inside PLC1 to start the water replenishment pump for water replenishment adjustment and transmit the low cooling water flow alarm text to the human-machine interface through communication.

6. The high-voltage inverter water cooling system monitoring system according to claim 5, characterized in that: PLC1 receives the data uploaded by pressure transmitter A, compares it with the water supply pressure ultra-low parameter setting value inside the system, and when the difference is less than 0.5 and lasts for more than 2s, PLC1 outputs an alarm signal to start the water supply pump adjustment and transmits the water supply pressure ultra-low alarm text to the human-machine interface through communication.

7. The high-voltage inverter water cooling system monitoring system according to claim 6, characterized in that: When PLC1 detects two alarms simultaneously, PLC1 triggers a trip signal to trip the high-voltage inverter.

8. The high-voltage inverter water cooling system monitoring system according to claim 7, characterized in that: The sampling temperature of water supply temperature transmitter A is compared with the setting value of the cooling water supply temperature over-high parameter inside the system. When the difference is less than 0.5 and lasts for more than 2s, an alarm signal is triggered inside PLC1 to start the electric three-way valve to direct the cooling water to the cold source and transmit the water supply temperature over-high alarm text to the human-machine interface through communication.

9. The high-voltage inverter water cooling system monitoring system according to claim 8, characterized in that: PLC1 receives the data uploaded by return water temperature transmitter A, and compares it with the return water temperature over-high parameter setting value inside the system. When the difference is less than 0.5 and lasts for more than 2s, PLC1 outputs an alarm signal and transmits the return water temperature over-high alarm text to the human-machine interface through communication; when PLC1 monitors two alarms at the same time, PLC1 triggers a trip signal to trip the high-voltage inverter.

10. The high-voltage inverter water cooling system monitoring system according to claim 1, characterized in that: When PLC1, cooling water flow transmitter A, pressure transmitter A, supply water temperature transmitter A, and return water temperature transmitter A fail, PLC2, cooling water flow transmitter B, pressure transmitter B, supply water temperature transmitter B, and return water temperature transmitter B start working.

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