A safety valve position sensor calibration system and method

Abstract

The present invention belongs to the field of instrumentation and control technology, and specifically relates to a safety valve position sensor calibration system and method. A safety valve position sensor calibration system includes two parts, namely a calibration device and a safety valve position simulation body, and also includes a connecting cable; this device realizes the calibration of the valve position by connecting with the safety valve position sensor and its signal conversion and output card, and has the advantages of convenient operation, simple structure and strong practicality. This device enables the staff to perform valve position calibration without entering the nuclear island during the operation of the unit, eliminating the safety risks such as radiation dose, on-site noise, and burns from high-temperature and high-pressure steam.

Description

Technical Field

[0001] The invention belongs to the technical field of instrumentation and control, and in particular relates to a safety valve position sensor calibration system and method. Background Art

[0002] As an important protective device to prevent pressure vessels from exceeding the pressure range, safety valves are widely used in important pressure vessels in nuclear power units such as pressurizers, steam generators, etc. in the nuclear island. The safety valve position sensor realizes the accurate measurement of the safety valve opening.

[0003] In the daily operation and maintenance of the unit, in order to ensure the effectiveness of the safety valve and the accuracy of the action threshold, the safety valve position sensor needs to be calibrated regularly. However, the safety valve and its valve position sensor are arranged in the nuclear island plant, and the actual action of the safety valve requires the system to frequently increase and decrease pressure, causing transient state of the unit.

[0004] In order to reduce the above risks, it is urgent to design and manufacture a safety valve position sensor calibration device that can complete the calibration of the valve position sensor without actually actuating the safety valve. Summary of the invention

[0005] The purpose of the present invention is to provide a safety valve position sensor calibration system and method, which can enable staff to complete the safety valve position calibration work offline and avoid staff from calibrating the valve position sensor in a radiation environment.

[0006] Summary of the invention of the present invention is as follows:

[0007] A safety valve position sensor calibration system comprises two parts, namely a calibration device and a safety valve position simulation body, and also comprises a connecting cable;

[0008] The safety valve position simulation body is connected to the safety valve position sensor to realize the function of simulating the switch state of the safety valve. The safety valve position sensor is then connected to the signal conversion and output card, and is connected to the calibration device through the signal conversion and output card.

[0009] The safety valve position simulation body includes a sensor fixing bracket, a switch position gasket, a rotating rod and a base 5. The sensor fixing bracket is fixed on the base. The safety valve position sensor first passes through the sensor fixing bracket and then passes through the switch position gasket; the rotating rod contacts the switch position gasket through the bracket and can rotate to press the switch gasket.

[0010] The calibration device is composed of a power supply terminal block, a power module, a power switch, a display and adjustment module, an internal analog module, a switching switch and a signal terminal block;

[0011] The power supply terminal block is used to connect to the power supply module. A power switch is provided between the power supply terminal block and the power supply module. The power switch is used to control the power supply of the device. The power supply module is used for voltage conversion and overload protection. The display and adjustment module and the internal analog module are all connected to the power supply module.

[0012] The display and adjustment module is connected to the internal analog module via a switch. The switch also connects the signal terminal block;

[0013] The connecting cable is used to connect the remote calibration device with the signal conversion and output card of the safety valve position sensor.

[0014] The display and adjustment module is used to receive the signal conversion when the valve position is open and closed, and the signal generated by the output card and perform calibration and adjustment.

[0015] The internal analog module displays and records the voltage values ​​corresponding to the current values ​​of the safety valve open and closed positions.

[0016] The switching switch is used to switch between the display and adjustment module and the internal analog module in the calibration device. The above signals are connected to the signal conversion and output card through the signal terminal block.

[0017] A safety valve position sensor calibration system, wherein the power supply terminal block is used to realize connection with the maintenance power supply, the power switch realizes isolation of the device from the external power supply, and the power module realizes functions such as voltage conversion and overload protection.

[0018] A safety valve position sensor calibration system, wherein the display and adjustment module is used to collect and display the real-time position signal output by the valve position sensor and display it, so as to convert the valve position sensor signal and adjust and calibrate the output card;

[0019] The signal terminal block collects the connection lines of the sensor signal conversion and output card and the calibration device to connect the two.

[0020] A safety valve position sensor calibration system, wherein the internal analog module forms a loop through the internal analog circuit and the signal conversion and output card, and uses a fixed DC voltage source for power supply. By adjusting the resistance value of the variable resistor, the current value corresponding to the signal conversion and output card is adjusted to the value corresponding to the open (4mA) and closed (20mA) positions of the safety valve. The corresponding voltage value is displayed and recorded through a measuring device, so that the next calibration can be performed directly in the internal analog circuit according to the recorded voltage value.

[0021] A method for calibrating a safety valve position sensor comprises the following steps:

[0022] S1: Connect the calibration device to the on-site maintenance power supply;

[0023] S2: Use a connecting cable to connect the signal conversion and output card of the safety valve position sensor 1 to the calibration device;

[0024] S3: Fix the safety valve position sensor 1 on the safety valve position simulation body;

[0025] S4: Insert the "off position" gasket on the simulation body and tighten it by rotating the rotary rod;

[0026] S5: Read the corresponding current value from the calibration device. If it does not match the standard value of 4mA, adjust the adjustment knob on the card until it meets the requirements;

[0027] S6: Switch the calibration device to the internal simulation mode and record the voltage value corresponding to 4 mA at this time;

[0028] S7: Insert the "open position" gasket into the simulation body and tighten it by rotating the rotary rod;

[0029] S8: Read the corresponding current value from the calibration device again. If it does not match the standard value of 20mA, adjust the adjustment knob on the card until it meets the requirements;

[0030] S9: Switch the calibration device to the internal simulation mode and record the voltage value corresponding to 20mA at this time;

[0031] S10: Repeat the above S4-S9 three times to ensure that the calibration work is correct and effective;

[0032] S11: After obtaining the recorded data, the internal simulation mode can be directly used to perform calibration work by comparing the recorded voltage value when calibrating again.

[0033] The beneficial effects of the present invention are as follows:

[0034] The device realizes the calibration of the valve position by connecting with the safety valve position sensor and its signal conversion and output card, and has the advantages of convenient operation, simple structure and strong practicality.

[0035] This device enables workers to perform valve position calibration without having to enter the nuclear island during unit operation, eliminating safety risks such as exposure to radiation doses, on-site noise, and burns from high-temperature and high-pressure steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the safety valve position calibration system of the present invention;

[0037] Figure 2 It is a schematic diagram of a safety valve position simulation body of the present invention;

[0038] Figure 3 It is a schematic diagram of the internal structure of the calibration device of the present invention;

[0039] Figure 4 It is a schematic diagram of the internal analog circuit of the present invention.

[0040] In the figure: 1. safety valve position sensor, 2. sensor fixing bracket, 3. switch position gasket, 4. rotary rod, 5. base. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0042] A safety valve position sensor calibration system comprises two parts, namely a calibration device and a safety valve position simulation body, and also comprises a connecting cable.

[0043] The safety valve position simulation body is connected to the safety valve position sensor 1 to realize the function of simulating the switch state of the safety valve. The safety valve position sensor 1 is then connected to the signal conversion and output card, and is connected to the calibration device through the signal conversion and output card.

[0044] The safety valve position simulation body includes a sensor fixing bracket 2, a switch position gasket 3, a rotary rod 4 and a base 5. The sensor fixing bracket 2 is fixed on the base 5, and the safety valve position sensor 1 first passes through the sensor fixing bracket 2 and then passes through the switch position gasket 3; the rotary rod 4 contacts the switch position gasket 3 through the bracket and can rotate and press the switch position gasket 3.

[0045] The calibration device consists of a power supply terminal block, a power module, a power switch, a display and adjustment module, an internal analog module, a switching switch, and a signal terminal block. The power supply terminal block is used to connect to the power module. A power switch is provided between the power supply terminal block and the power module. The power switch is used to control the power supply of the device. The power module is used for voltage conversion and overload protection. The display and adjustment module and the internal analog module are connected to the power module. The display and adjustment module is connected to the internal analog module through the switching switch. The switching switch is also connected to the signal terminal block.

[0046] The display and adjustment module is used to receive the signal conversion when the valve position is open and closed, and the signal generated by the output card and perform calibration and adjustment.

[0047] The internal analog module displays and records the voltage values ​​corresponding to the current values ​​of the safety valve open and closed positions.

[0048] The switching switch is used to switch between the display and adjustment module and the internal analog module in the calibration device. The above signals are connected to the signal conversion and output card through the signal terminal block.

[0049] The power supply terminal block is used to connect to the maintenance power supply, the power switch isolates the device from the external power supply, and the power module realizes functions such as voltage conversion and overload protection.

[0050] The display and adjustment module is used to collect and display the real-time position signal output by the valve position sensor and display it to perform valve position sensor signal conversion and output card adjustment and calibration.

[0051] The signal terminal block collects the connection lines of the sensor signal conversion and output card and the calibration device to connect the two.

[0052] The connecting cable is used to connect the remote calibration device with the signal conversion and output card of the safety valve position sensor.

[0053] The internal analog module forms a loop with the signal conversion and output card through the internal analog circuit, uses a fixed DC voltage source for power supply, and adjusts the current value corresponding to the signal conversion and output card to the value corresponding to the open (4mA) and closed (20mA) positions of the safety valve by adjusting the resistance value of the variable resistor. The corresponding voltage value is displayed and recorded through the measuring device. So that the next calibration can be directly performed in the internal analog circuit according to the recorded voltage value.

[0054] A method for calibrating a safety valve position sensor comprises the following steps:

[0055] S1: Connect the calibration device to the on-site maintenance power supply;

[0056] S2: Use a connecting cable to connect the signal conversion and output card of the safety valve position sensor 1 to the calibration device;

[0057] S3: Fix the safety valve position sensor 1 on the safety valve position simulation body;

[0058] S4: Insert the "off position" gasket on the simulation body and tighten it by rotating the rotary rod;

[0059] S5: Read the corresponding current value from the calibration device. If it does not match the standard value of 4mA, adjust the adjustment knob on the card until it meets the requirements;

[0060] S6: Switch the calibration device to the internal simulation mode and record the voltage value corresponding to 4 mA at this time;

[0061] S7: insert the "open position" gasket into the simulation body and rotate and tighten it by rotating the rotating rod 4;

[0062] S8: Read the corresponding current value from the calibration device again. If it does not match the standard value of 20mA, adjust the adjustment knob on the card until it meets the requirements;

[0063] S9: Switch the calibration device to the internal simulation mode and record the voltage value corresponding to 20mA at this time;

[0064] S10: Repeat the above S4-S9 three times to ensure that the calibration work is correct and effective;

[0065] S11: After obtaining the recorded data, the internal simulation mode can be directly used to perform calibration work by comparing the recorded voltage value when calibrating again.

Claims

1. A safety valve position sensor calibration system, comprising two parts, namely a calibration device and a safety valve position simulation body, and also comprising a connecting cable; Features: The safety valve position simulation body is connected to the safety valve position sensor to realize the function of simulating the switch state of the safety valve. The safety valve position sensor is then connected to the signal conversion and output card, and is connected to the calibration device through the signal conversion and output card; The safety valve position simulation body comprises a sensor fixing bracket, a switch position gasket, a rotating rod and a base. The sensor fixing bracket is fixed on the base. The safety valve position sensor first passes through the sensor fixing bracket and then passes through the switch position gasket. The rotating rod contacts the switch position gasket through the bracket and can rotate and press the switch gasket. The calibration device is composed of a power supply terminal block, a power module, a power switch, a display and adjustment module, an internal analog module, a switching switch and a signal terminal block; The power supply terminal block is used to connect to the power supply module. A power switch is provided between the power supply terminal block and the power supply module. The power switch is used to control the power supply of the device. The power supply module is used for voltage conversion and overload protection. The display and adjustment module and the internal analog module are all connected to the power supply module. The display and adjustment module is connected to the internal analog module via a switching switch, which is also connected to the signal terminal block; The connecting cable is used to connect the calibration device, the safety valve position sensor and the signal conversion and output card.

2. A safety valve position sensor calibration system as claimed in claim 1, characterized in that: The display and adjustment module is used to receive the signal conversion when the valve position is open and closed, and the signal generated by the output card and perform calibration and adjustment.

3. A safety valve position sensor calibration system as claimed in claim 1, characterized in that: The internal analog module displays and records the voltage values ​​corresponding to the current values ​​of the safety valve open and closed positions.

4. A safety valve position sensor calibration system as claimed in claim 1, characterized in that: The switching switch is used to switch between the display and adjustment module and the internal analog module in the calibration device. The above signals are connected to the signal conversion and output card through the signal terminal block.

5. A safety valve position sensor calibration system as claimed in claim 1, characterized in that: The power supply terminal block is used to connect to the maintenance power supply, the power switch isolates the device from the external power supply, and the power module realizes functions such as voltage conversion and overload protection.

6. A safety valve position sensor calibration system as claimed in claim 1, characterized in that: The display and adjustment module is used to collect and display the real-time position signal output by the safety valve position sensor and display it to convert the safety valve position sensor signal and adjust and calibrate the output card; The signal terminal block collects the connection lines of the safety valve position sensor signal conversion and output card and the calibration device to connect the two.

7. A safety valve position sensor calibration system as claimed in claim 1, characterized in that: The internal analog module forms a loop with the signal conversion and output card through the internal analog circuit, and is powered by a fixed DC voltage source. By adjusting the resistance of the variable resistor, the current value corresponding to the signal conversion and output card is adjusted to the value of 4mA or 20mA corresponding to the open or closed position of the safety valve, and the corresponding voltage value is displayed and recorded by the measuring device, so that the next calibration can be directly performed in the internal analog circuit according to the recorded voltage value.

8. A method for calibrating a safety valve position sensor, comprising the following steps: S1: Connect the calibration device to the on-site maintenance power supply; S2: Use a connecting cable to connect the safety valve position sensor signal conversion and output card to the calibration device; S3: Fix the safety valve position sensor on the safety valve position simulation body; S4: Insert the "off position" gasket on the simulation body and tighten it by rotating the rotary rod; S5: Read the corresponding current value from the calibration device. If it does not match the standard value of 4mA, adjust the adjustment knob on the card until it meets the requirements; S6: Switch the calibration device to the internal simulation mode and record the voltage value corresponding to 4 mA at this time; S7: Insert the "open position" gasket into the simulation body and tighten it by rotating the rotary rod; S8: Read the corresponding current value from the calibration device again. If it does not match the standard value of 20mA, adjust the adjustment knob on the card until it meets the requirements; S9: Switch the calibration device to the internal simulation mode and record the voltage value corresponding to 20mA at this time; S10: Repeat the above S4-S9 three times to ensure that the calibration work is correct and effective; S11: After obtaining the recorded data, the internal simulation mode can be directly used to perform calibration again by comparing the recorded voltage value.

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