CN103017813A - Comprehensive detection device of direct-current transmission valve cooling system instrument - Google Patents

Abstract

The invention discloses a comprehensive instrument detection device for a direct current transmission valve cooling system, which includes temperature, pressure, liquid level, conductivity and flow meter detection units, and also includes a PLC control system and a host computer. The instrument detection unit, the pressure instrument detection unit, the liquid level instrument detection unit, the conductivity instrument detection unit and the flow instrument detection unit communicate with the PLC control system, and the upper computer and the control system are connected through optical fibers. This device can comprehensively detect and analyze the accuracy of various instruments in the DC transmission valve cooling system, improve the system management level of the valve cooling equipment, enhance the risk pre-control ability, carry out detection and analysis work, and at the same time provide an online monitoring instrument file for the valve cooling system Provide scientific data basis for the establishment and formulation of testing standards.

Description

Comprehensive detection device for instrumentation of DC transmission valve cooling system

technical field

The invention relates to a direct current transmission valve cooling system, in particular to a comprehensive instrument detection device for a direct current transmission valve cooling system.

Background technique

As one of the most important auxiliary systems in HVDC power transmission projects, the DC valve cooling system ensures the safe and reliable operation of DC converter valves by precisely controlling the technical indicators of the cooling water temperature, flow, pressure and water quality of the valve cooling system. The online monitoring instruments in the valve cooling system include meters for temperature, pressure, liquid level and conductivity. Their accuracy and reliability will directly affect the safe operation of the valve cooling system. Therefore, it is necessary to regularly inspect various instruments to ensure its accuracy.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a comprehensive detection device for the instrument of the direct current transmission valve cooling system.

In order to solve the above problems, the technical solution adopted in the present invention is:

The instrument comprehensive detection device of DC transmission valve cooling system, including temperature instrument detection unit, pressure instrument detection unit, liquid level instrument detection unit, conductivity instrument detection unit, flow instrument detection unit, PLC control system and upper computer, The temperature instrument detection unit, the pressure instrument detection unit, the liquid level instrument detection unit, the conductivity instrument detection unit and the flow instrument detection unit communicate with the PLC control system, and the upper computer and the control system are connected through optical fibers;

The PLC control system is used to collect and process the data signals detected by the temperature instrument detection unit, the pressure instrument detection unit, the liquid level instrument detection unit, the conductivity instrument detection unit and the flow instrument detection unit, and Communicate with the host computer, and transmit the data signal to the host computer;

The host computer is used to collect data signals transmitted by the PLC control system, and perform detection, calculation, data archiving, performance curve generation and automatic generation of detection reports.

In order to better realize the present invention, the human-machine interface of the PLC control system adopts a touch screen to display the current system operating status, operating mode, and process parameters, and has a self-diagnostic function for identifying faults, and can switch the process principles of different detection units through the touch screen. Table printing, group parameter display, real-time status of control objects and fault information, etc.

In order to better realize the present invention, the temperature instrument detection unit includes a constant temperature bath, a platinum resistance standard device, a process calibrator, a measured temperature instrument and a test control box, and the platinum resistance standard device, a process calibrator , The measured temperature instrument and the test control box are connected to the PLC control system, and the test control box is connected to the constant temperature tank for selecting manual test or automatic test. During the automatic test, the test control box sends an automatic test command to the PLC control system, The platinum resistance standard device and the measured temperature instrument measure the temperature of the constant temperature bath at the same time. When manual testing is selected, the data is manually input to the host computer. When automatic testing is selected, the data signal is transmitted to the host computer through PLC, and finally the data is processed by the host computer. Analyze and output the results.

In order to better realize the present invention, the pressure instrument detection unit includes a standard pressure gauge, a pressure calibrator, a process calibrator and a pressure instrument to be tested, the standard pressure gauge, a pressure calibrator, a process calibrator and The measured pressure instrument is connected to the PLC control system. The standard pressure gauge and the measured pressure instrument measure the pressure of the pressure calibrator at the same time, and transmit the data signal to the PLC. Finally, the host computer analyzes the data and outputs the result.

In order to better realize the present invention, the liquid level instrument detection unit includes a water pump, a raw water tank, a test water tank, a transparent glass tube liquid level gauge, a magnetostrictive liquid level gauge, a liquid level instrument to be tested and a test control The water pump, the raw water tank and the test water tank are connected in sequence, the transparent glass tube liquid level gauge, the magnetostrictive liquid level gauge and the measured liquid level instrument are installed on the test water tank, and the transparent glass tube liquid level gauge And the magnetostrictive liquid level gauge is used as the standard liquid level gauge, the water pump, the magnetostrictive liquid level gauge, the measured liquid level instrument and the test control box are connected with the PLC control system, and the test control box is used to select the manual test Or automatic test, during the automatic test, the test control box sends automatic test instructions to the PLC control system, and the PLC control system controls the water pump to adjust the liquid level of the test water tank according to the target test liquid level, the magnetostrictive liquid level gauge and the liquid level to be tested The instrument measures the liquid level of the test water tank at the same time, and transmits the data signal to the PLC control system, and finally the upper computer analyzes the data and outputs the result.

In order to better realize the present invention, the conductivity meter detection unit includes a conductivity meter standard device, a conductivity standard solution, and a measured conductivity meter, and the measured conductivity meter is connected to a PLC control system, and the conductivity meter The standard instrument and the measured conductivity instrument measure the conductivity of the conductivity standard solution at the same time, and the host computer analyzes the data and outputs the result.

In order to better realize the present invention, the flow meter detection unit includes a water pump, a tank, a bypass electric valve, a vent valve, a pressure gauge, a portable ultrasonic flowmeter and a measured flow meter, the water pump, the bypass The electric valve, the measured flow meter, the pressure gauge and the tank are connected into a loop through stainless steel pipes. The vent valve is installed on the pipe, and the bypass electric valve is connected in parallel with the water pump to form a bypass. The water pump, the measured flow meter and The portable ultrasonic flowmeter is connected with the PLC control system. The PLC control system adjusts the bypass electric valve according to the target test flow to adjust the pipeline flow. Analyze data and output results.

Compared with the prior art, the present invention has the following advantages and beneficial effects: through the instrument comprehensive detection device of the direct current valve cooling system, temperature instruments, pressure instruments, liquid level instruments, conductivity instruments and Comprehensive and regular detection and analysis of flow meters, improve the system management level of valve cooling equipment, enhance risk pre-control capabilities, carry out detection and analysis work, and provide scientific data for the establishment of on-line monitoring instrument equipment files and the formulation of testing standards for valve cooling systems in accordance with.

Description of drawings

Figure 1 is a structural diagram of a comprehensive instrumentation detection device for a DC transmission valve cooling system described in Embodiment 1 of the present invention;

Fig. 2 is a structural diagram of a temperature instrument detection unit of a comprehensive detection device for a DC transmission valve cooling system instrument according to Embodiment 1 of the present invention;

Fig. 3 is a structural diagram of a pressure instrument detection unit of a comprehensive detection device for a DC power transmission valve cooling system instrument according to Embodiment 1 of the present invention;

Fig. 4 is a structural diagram of a liquid level meter detection unit of a comprehensive detection device for a DC transmission valve cooling system instrument according to Embodiment 1 of the present invention;

Fig. 5 is a structural diagram of a flow instrument detection unit of a comprehensive instrument detection device for a DC power transmission valve cooling system according to Embodiment 1 of the present invention.

Detailed ways

The embodiments of the present invention will be further described in detail below in conjunction with the examples and drawings, but the embodiments of the present invention are not limited thereto.

Example 1

As shown in Figure 1, the instrument comprehensive detection device of the DC transmission valve cooling system includes a temperature instrument detection unit, a pressure instrument detection unit, a liquid level instrument detection unit, a conductivity instrument detection unit, a flow instrument detection unit, and a PLC. Control system and upper computer, the temperature instrument detection unit, pressure instrument detection unit, liquid level instrument detection unit, conductivity instrument detection unit and flow instrument detection unit are controlled by PLC through TCP/IP Ethernet communication mode The system communicates, the upper computer and the control system are connected through optical fibers, and the man-machine interface of the PLC control system adopts a touch screen to display the current system operation status, operation mode, and process parameters. Requirements for process principle, tabulation and printing, group parameter display, real-time status of control objects and fault information, etc.

The PLC control system is used to collect and process the data signals detected by the temperature instrument detection unit, the pressure instrument detection unit, the liquid level instrument detection unit, the conductivity instrument detection unit and the flow instrument detection unit, and Communicate with the host computer, and transmit the data signal to the host computer;

The host computer is used to collect data signals transmitted by the PLC control system, and perform detection, calculation, data archiving, performance curve generation and automatic generation of detection reports.

As shown in Figure 2, the temperature instrument detection unit includes a constant temperature bath, a platinum resistance standard device, a process calibrator, a measured temperature instrument, and a test control box. The temperature measuring instrument and the test control box are connected to the PLC control system. The test control box is connected to the constant temperature tank for selecting manual test or automatic test. During the automatic test, the test control box sends automatic test instructions to the PLC control system. Platinum resistance The standard device and the measured temperature instrument measure the temperature of the constant temperature bath at the same time. When manual testing is selected, the data is manually input to the host computer. When automatic testing is selected, the data signal is transmitted to the host computer through the PLC, and finally the host computer analyzes the data. and output the result.

As shown in Figure 3, the pressure instrument detection unit includes a standard pressure gauge, a pressure calibrator, a process calibrator and a pressure instrument to be tested, and the standard pressure gauge, a pressure calibrator, a process calibrator and a The pressure instrument is connected to the PLC control system. The standard pressure gauge and the measured pressure instrument measure the pressure of the pressure calibrator at the same time, and transmit the data signal to the PLC. Finally, the host computer analyzes the data and outputs the result.

As shown in Figure 4, the liquid level instrument detection unit includes a water pump 1, a raw water tank 2, a test water tank 3, a transparent glass tube liquid level gauge 5, a magnetostrictive liquid level gauge 6, and a measured liquid level instrument 4 and the test control box 7, the water pump 1, the raw water tank 2 and the test water tank 3 are sequentially connected, the transparent glass tube liquid level gauge 5, the magnetostrictive liquid level gauge 6 and the measured liquid level instrument 4 (including the float type liquid level gauge 4-1, pressure type liquid level gauge 4-2, capacitance type liquid level gauge 4-3, ultrasonic liquid level gauge 4-4) installed on the test water tank 3, transparent glass tube type liquid level gauge 5 And the magnetostrictive liquid level gauge 6 is used as a standard liquid level gauge, the water pump 1, the magnetostrictive liquid level gauge 6, the measured liquid level instrument 4 and the test control box 7 are connected with the PLC control system 8, and the test control The box 7 is used to select manual test or automatic test. During the automatic test, the test control box 7 sends an automatic test command to the PLC control system 8, and the PLC control system 8 starts the water pump 1, and the PLC control system 8 controls the water pump 1 according to the target test liquid level Adjust the liquid level of the test water tank 3, the magnetostrictive liquid level gauge 6 and the measured liquid level instrument 4 measure the liquid level of the test water tank 3 at the same time, and transmit the data signal to the PLC control system 8, and finally the upper computer performs data processing Analyze and output the results, and the transparent glass tube type liquid level gauge is used for preliminary inspection.

The detection unit of the conductivity meter includes a conductivity meter standard, a conductivity standard solution and a measured conductivity meter, the measured conductivity meter is connected to the PLC control system, the conductivity meter standard and the measured conductivity meter The instrument measures the conductivity of the conductivity standard solution at the same time, and the host computer analyzes the data and outputs the results.

As shown in Figure 5, the flow meter detection unit includes a water pump 10, a tank body 11, a bypass electric valve 15, a vent valve 16, a pressure gauge 12, a portable ultrasonic flowmeter 14 and a flow meter 13 to be measured. The water pump 10, the measured flow meter 13, the pressure gauge 12 and the tank body 11 are connected into a loop through stainless steel pipes, the vent valve 16 is installed on the pipe, and the bypass electric valve 15 is connected in parallel with the circulating water pump 1 to form a bypass. The water pump 10, the bypass electric valve 15, the measured flow meter 13 and the portable ultrasonic flowmeter 14 are connected to the PLC control system 8. The PLC control system 8 starts the water pump 10, and the PLC control system 8 adjusts the bypass electric valve according to the target test flow rate. The valve 15 adjusts the pipeline flow, and the portable ultrasonic flowmeter 14 and the measured flow meter 13 measure the loop flow at the same time, and the upper computer 9 analyzes the data and outputs the result.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (7)

1. The instrument comprehensive detection device of the DC transmission valve cooling system, which is characterized in that it includes a temperature instrument detection unit, a pressure instrument detection unit, a liquid level instrument detection unit, a conductivity instrument detection unit, a flow instrument detection unit, and a PLC. Control system and upper computer, the temperature instrument detection unit, pressure instrument detection unit, liquid level instrument detection unit, conductivity instrument detection unit and flow instrument detection unit communicate with the PLC control system, the upper computer and the control The system is connected by optical fiber; The PLC control system is used to collect and process the data signals detected by the temperature instrument detection unit, the pressure instrument detection unit, the liquid level instrument detection unit, the conductivity instrument detection unit and the flow instrument detection unit, and Communicate with the host computer, and transmit the data signal to the host computer; The host computer is used to collect data signals transmitted by the PLC control system, and perform detection, calculation, data archiving, performance curve generation and automatic generation of detection reports. 2. The instrument comprehensive detection device of the direct current transmission valve cooling system according to claim 1, characterized in that: the man-machine interface of the PLC control system adopts a touch screen. 3. According to claim 1, the comprehensive detection device for the instrument of the DC transmission valve cooling system is characterized in that: the temperature instrument detection unit includes a constant temperature bath, a platinum resistance standard device, a process calibrator, a measured temperature instrument and a test The control box, the platinum resistance standard device, the process calibrator, the measured temperature instrument and the test control box are connected to the PLC control system, and the test control box is connected to the constant temperature bath for selecting manual test or automatic test, automatic During the test, the test control box sends an automatic test command to the PLC control system. The platinum resistance standard device and the measured temperature instrument measure the temperature of the constant temperature bath at the same time. When manual testing is selected, the data is manually input to the host computer. It is transmitted to the host computer through PLC, and finally the host computer analyzes the data and outputs the results. 4. According to claim 1, the integrated detection device for the instrumentation of the DC transmission valve cooling system is characterized in that: the pressure instrument detection unit includes a standard pressure gauge, a pressure calibrator, a process calibrator and a measured pressure instrument, the The standard pressure gauge, pressure calibrator, process calibrator, and measured pressure instrument are connected to the PLC control system. The standard pressure gauge and the measured pressure instrument measure the pressure of the pressure calibrator at the same time, and transmit the data signal to the PLC. Finally The host computer analyzes the data and outputs the results. 5. According to claim 1, the DC transmission valve cooling system instrument comprehensive detection device is characterized in that: the liquid level instrument detection unit includes a water pump, a raw water tank, a test water tank, a transparent glass tube liquid level gauge, a magnetic The telescopic liquid level gauge, the liquid level gauge to be tested and the test control box, the water pump, the raw water tank and the test water tank are connected in sequence, the transparent glass tube liquid level gauge, the magnetostrictive liquid level gauge and the liquid level gauge to be tested Installed on the test water tank, the transparent glass tube liquid level gauge and the magnetostrictive liquid level gauge are used as the standard liquid level gauge, the water pump, the magnetostrictive liquid level gauge, the measured liquid level instrument and the test control box are connected with the PLC The control system is connected, and the test control box is used to select manual test or automatic test. During the automatic test, the test control box sends an automatic test command to the PLC control system, and the PLC control system controls the water pump to adjust the liquid in the test water tank according to the target test liquid level. level, the magnetostrictive liquid level gauge and the measured liquid level instrument measure the liquid level of the test water tank at the same time, and transmit the data signal to the PLC control system, and finally the upper computer analyzes the data and outputs the result. 6. According to claim 1, the comprehensive instrument detection device for the DC transmission valve cooling system is characterized in that: the conductivity meter detection unit includes a conductivity meter standard, a conductivity standard solution, and a conductivity meter to be tested. The measured conductivity meter is connected to the PLC control system, the conductivity meter standard device and the measured conductivity meter measure the conductivity of the conductivity standard solution at the same time, and the host computer analyzes the data and outputs the result. 7. According to claim 1, the DC transmission valve cooling system instrument comprehensive detection device is characterized in that: the flow meter detection unit includes a water pump, a tank body, a bypass electric valve, a vent valve, a pressure gauge, and a portable ultrasonic flow meter. Considering the measured flow meter, the water pump, bypass electric valve, measured flow meter, pressure gauge and tank are connected to form a circuit through stainless steel pipes, the vent valve is installed on the pipe, and the bypass electric valve is connected in parallel with the water pump Form a bypass, the water pump, the measured flow meter and the portable ultrasonic flowmeter are connected to the PLC control system, and the PLC control system adjusts the bypass electric valve according to the target test flow to adjust the pipeline flow. The portable ultrasonic flowmeter and The flow meter under test measures the loop flow at the same time, and the host computer analyzes the data and outputs the result.

Images