An off-line test tool for a transmitter signal isolator

Abstract

The present application relates to a kind of off-line detection tools of transmitter signal isolator, suitable for the installation, debugging and maintenance of nuclear power plant transmitter signal isolator.Adjustable electronic load, series access signal output circuit;Adjustable power supply, through positive and negative power cable access isolator power supply terminal;Adjustable output source, through positive and negative signal cable access isolator signal input terminal;Constant temperature box, isolator is placed in constant temperature box;Manual regulator, through cable respectively access to signal output circuit, adjustable power supply circuit, signal input circuit;Automatic controller, through signal cable access to signal output circuit, adjustable power supply circuit, signal input circuit;Test starting switch, through signal cable access automatic controller;Liquid crystal display, through communication cable and automatic controller connection.The present application can make the method of transmitter signal isolator maintenance more mature, overhaul quality is more controllable, overhaul efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to an offline detection tool for a transmitter signal isolator, which is suitable for installation, debugging and maintenance of a transmitter signal isolator in a nuclear power plant. BACKGROUND

[0002] Currently, a transmitter signal isolator is widely used in the field of measurement and control in a nuclear power plant. During overhaul or daily maintenance of the nuclear power unit, functional inspection is performed on the transmitter signal isolator to find problems in the isolator and correct the problems, so that the performance parameters of the isolator meet the design requirements, thereby ensuring safe and stable operation of the unit during the next nuclear fuel cycle. In the actual maintenance process, the device has problems such as lack of installation guidance method, immature debugging method, harsh maintenance window, and occupation of unit overhaul main line time during maintenance process. If the maintenance quality is unqualified, the unit will be in a state of retreat, which greatly occupies the main line time of overhaul. SUMMARY

[0003] During maintenance of the transmitter signal isolator, there are problems such as lack of installation guidance method, immature debugging method, harsh maintenance window, and occupation of unit overhaul main line time during maintenance process. In order to solve the above problems, the present application provides an offline detection tool for a transmitter signal isolator. During unit overhaul and daily maintenance, the isolator is disassembled and inspected and maintained by the tool to find problems such as performance degradation of the isolator and correct the problems, and then the instrument is installed after successful debugging by the tool. At the same time, the present application can make the maintenance method of the transmitter signal isolator more mature, the maintenance quality more controllable, and the maintenance efficiency greatly improved.

[0004] To achieve the above purpose, the technical solution adopted by the present application is as follows:

[0005] An offline detection tool for a transmitter signal isolator, comprising: an adjustable electronic load connected in series to a signal output circuit; an adjustable power supply connected to power supply terminals of the isolator through positive and negative power supply cables; an adjustable output source connected to signal input terminals of the isolator through positive and negative signal cables; a thermostat box in which the isolator is placed; a manual regulator connected to the signal output circuit, the adjustable power supply circuit and the signal input circuit through cables; an automatic controller connected to the signal output circuit, the adjustable power supply circuit and the signal input circuit through signal cables; a test start switch connected to the automatic controller through a signal cable; and a liquid crystal display screen connected to the automatic controller through a communication cable.

[0006] Input and output precision test: set the adjustable power supply to 24VDC and the adjustable electronic load to 250Ω, adjust the signal of the adjustable output source, measure the voltage or current signal at both ends of the adjustable electronic load, and compare it with the input signal to determine whether the output precision meets the technical requirements.

[0007] Normal temperature with load capacity test: adjustable power supply is set to 24VDC, adjustable output source is set to 20mA, adjustable electronic load is gradually increased, the current signal between the two ends of the adjustable electronic load is measured and compared with the input signal, when the signal can not meet the accuracy requirements is the maximum load.

[0008] Normal temperature isolator voltage adaptation range test: adjustable output source is set to 20mA, adjustable electronic load is set to 250Ω, the voltage or current signal between the two ends of the adjustable electronic load is measured; adjustable power supply is set to 24VDC, gradually reduce from 24V, when the signal can not meet the accuracy requirements is the minimum voltage; gradually increase from 24V, when the signal can not meet the accuracy requirements is the maximum voltage.

[0009] Isolator temperature high temperature adaptation range test: adjustable output source is set to 20mA, adjustable electronic load is set to 250Ω, adjustable power supply is set to 24VDC, gradually increase the working temperature of the thermostat, when the signal can not meet the accuracy requirements is the high adaptation temperature.

[0010] By measuring the voltage or current signal between the two ends of the adjustable electronic load, it is determined whether the load capacity of the isolator can meet the use requirements; the adjustable power supply provides power for the operation of the isolator, and the voltage adaptation range of the isolator is tested by changing the size of the adjustable power supply; the adjustable output source provides a standard current input signal for the isolator, and the input and output accuracy of the isolator is tested by changing the size of the adjustable output source; the thermostat provides a specific temperature environment for the isolator, and the temperature adaptation range of the isolator is tested by changing the temperature of the thermostat.

[0011] The isolator test cable is connected, the manual adjuster is used to adjust the adjustable electronic load, the adjustable power supply and the adjustable output source respectively, the output state of the isolator is recorded, and it is artificially determined whether the isolator works normally.

[0012] The isolator test cable is connected, the test start switch is pressed, and the automatic controller will automatically adjust the adjustable power supply, the adjustable output source, the adjustable electronic load and the thermostat temperature according to the preset scheme, automatically judge whether the isolator is normal according to the preset input and output logical relationship, and the test result is displayed and output by the liquid crystal display screen.

[0013] The test start switch is the trigger of the automatic test function, and the automatic controller runs when the switch is pressed, and tests according to the preset scheme.

[0014] The liquid crystal display screen is used to display the measurement results, real-time data of the adjustable power supply, the adjustable output source, the adjustable electronic load and the thermostat temperature.

[0015] The beneficial effects obtained by the present application are:

[0016] The tool is designed with an integrated adjustable power supply, which on the one hand provides power supply for the normal operation of the isolator, and on the other hand, through adjusting the voltage, the voltage adaptation performance can be effectively tested, and the abnormality of the voltage adaptation parameter of the isolator can be found in time.

[0017] The tool is designed with an integrated adjustable electronic load, and through adjusting the load size, the output load carrying capacity of the transmitter signal isolator can be directly detected.

[0018] The tool is designed with an integrated adjustable current source module, and through adjusting the output of the current source, the detection of the adaptation range of the input current signal of the isolator can be performed.

[0019] The tool is designed with a constant temperature device, and through adjusting the temperature of the constant temperature device, the high temperature adaptation range of the isolator can be detected, and the influence of the on-site working environment on the working state of the isolator can be evaluated.

[0020] The tool is designed with an automatic detection function, and the instrument output signal is automatically compared with the preset signal in the controller, and the performance parameters of the detected object are automatically displayed. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The figure is a schematic view of an offline detection tool for a transmitter signal isolator. DETAILED DESCRIPTION

[0022] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0023] As Figure 1 shown, the transmitter signal isolator offline detection tool is designed in an integrated manner and includes the following components: adjustable electronic load, adjustable power supply, adjustable output source, constant temperature oven, manual regulator, automatic controller, test start switch, and liquid crystal display.

[0024] The adjustable electronic load is used to change the size of the load in the signal loop, and is connected in series with the signal output loop of the isolator. By measuring the voltage or current signal across the adjustable electronic load, it can be determined whether the load carrying performance of the isolator can meet the use requirements.

[0025] The adjustable power supply provides power supply for the operation of the isolator, and is connected to the power supply terminals of the isolator through positive and negative power cables. By changing the size of the adjustable power supply, the voltage adaptation range of the isolator can be tested.

[0026] The adjustable output source provides a standard current input signal for the isolator, and is connected to the signal input terminals of the isolator through positive and negative signal cables. By changing the size of the adjustable output source, the input and output accuracy of the isolator can be tested.

[0027] Constant temperature box, provides a specific temperature environment for the isolator, the isolator is placed in the constant temperature box. By changing the temperature of the constant temperature box, the temperature adaptation range of the isolator is tested.

[0028] Manual adjuster, respectively, to achieve the adjustment of the adjustable electronic load, adjustable power supply, adjustable output source, manual adjuster is connected to the signal output circuit, adjustable power supply circuit, signal input circuit through the cable.

[0029] Automatic controller, automatically adjusts the adjustable power supply, adjustable output source, adjustable electronic load, constant temperature box temperature according to the preset scheme, automatically determines whether the isolator is normal according to the preset input-output logical relationship, and the test result is displayed on the liquid crystal display screen. The automatic controller is connected to the signal output circuit, adjustable power supply circuit, signal input circuit through the signal cable.

[0030] Test start switch, trigger of automatic test function, press the switch, the automatic controller runs according to the preset scheme. The test start switch is connected to the automatic controller through the signal cable.

[0031] Liquid crystal display, used to display the measurement results, real-time data of adjustable power supply, adjustable output source, adjustable electronic load, constant temperature box temperature. The liquid crystal display is connected with the automatic controller through the communication cable.

[0032] Test principle and method:

[0033] Input-output precision test:

[0034] Set the adjustable power supply to 24VDC, set the adjustable electronic load to 250Ω, adjust the signal of the adjustable output source, measure the voltage or current signal across the adjustable electronic load, and compare it with the input signal to determine whether the output precision meets the technical requirements.

[0035] Normal temperature load capacity test:

[0036] Set the adjustable power supply to 24VDC, set the adjustable output source to 20mA (or 5V, according to the signal type), adjust the adjustable electronic load to gradually increase (if it is voltage output, gradually reduce), measure the voltage or current signal across the adjustable electronic load, and compare it with the input signal, when the signal cannot meet the precision requirements is the maximum (minimum) load (current output is maximum, voltage output is minimum).

[0037] Normal temperature isolator voltage adaptation range test:

[0038] Set the adjustable output source to 20mA (or 5V, according to the signal type), the adjustable electronic load to 250Ω (1KΩ for voltage output type), and measure the voltage or current signal across the adjustable electronic load. Set the adjustable power source to 24VDC, gradually reduce from 24V, and the lowest voltage is when the signal can no longer meet the accuracy requirements; gradually increase from 24V (note that do not exceed the limit voltage required by the device), and the highest voltage is when the signal can no longer meet the accuracy requirements.

[0039] High temperature adaptation range test of the isolator:

[0040] Set the adjustable output source to 20mA (or 5V, according to the signal type), the adjustable electronic load to 250Ω (1KΩ for voltage output type), and the adjustable power source to 24VDC. Gradually increase the temperature of the thermostat (note that do not exceed the limit temperature required by the device), and the high adaptation temperature is when the signal can no longer meet the accuracy requirements.

[0041] The present application has two test modes: manual and automatic:

[0042] Manual mode: connect the isolator test cable, manually adjust the adjustable power source, adjustable output source, and adjustable electronic load, record the output state of the isolator, and manually determine whether the isolator is working normally.

[0043] Automatic mode: connect the isolator test cable, press the test start switch, and the automatic controller will automatically adjust the adjustable power source, adjustable output source, adjustable electronic load, and thermostat temperature according to the preset scheme. According to the preset input-output logic relationship, automatically determine whether the isolator is normal, and the test result is displayed and output by the liquid crystal display screen.

Claims

1. An offline detection tool for transmitter signal isolators, characterized by: include: The adjustable electronic load is connected in series to the signal output circuit; the adjustable power supply is connected to the power supply terminals of the isolator through positive and negative power cables; The adjustable output source is connected to the signal input terminal of the isolator through positive and negative signal cables; the isolator is placed in a constant temperature box; the manual regulator is connected to the signal output circuit, adjustable power circuit, and signal input circuit through cables; the automatic controller is connected to the signal output circuit, adjustable power circuit, and signal input circuit through signal cables; the test start switch is connected to the automatic controller through a signal cable; the LCD is connected to the automatic controller through a communication cable; Input and output accuracy test: Set the adjustable power supply to 24VDC and the adjustable electronic load to 250Ω. Adjust the signal of the adjustable output source, measure the voltage or current signal at both ends of the adjustable electronic load, and compare it with the input signal to determine whether the output accuracy meets the technical requirements. Normal temperature load capacity test: Set the adjustable power supply to 24VDC and the adjustable output source to 20mA. Adjust the adjustable electronic load to gradually increase the voltage. Measure the current signal at both ends of the adjustable electronic load and compare it with the input signal. When it is detected that the signal no longer meets the accuracy requirements, it is the maximum load. Normal temperature isolator voltage adaptability range test: Set the adjustable output source to 20mA, the adjustable electronic load to 250Ω, and measure the voltage or current signal at both ends of the adjustable electronic load; Set the adjustable power supply to 24VDC, and gradually reduce it from 24V. When it is detected that the signal no longer meets the accuracy requirements, it is the lowest voltage; and gradually increase it from 24V. When it is detected that the signal no longer meets the accuracy requirements, it is the highest voltage. Isolator high temperature adaptation range test: Set the adjustable output source to 20mA, the adjustable electronic load to 250Ω, and the adjustable power supply to 24VDC. Gradually increase the operating temperature of the constant temperature box. When the signal is detected and can no longer meet the accuracy requirements, it is the high adaptation temperature. By measuring the voltage or current signals at both ends of the adjustable electronic load, it is determined whether the load performance of the isolator can meet the usage requirements; the adjustable power supply provides power for the isolator, and by changing the size of the adjustable power supply, the voltage adaptation range of the isolator is tested; the adjustable output source provides a standard current input signal for the isolator, and by changing the size of the adjustable output source, the input and output accuracy of the isolator is tested; the constant temperature chamber provides a specific temperature environment for the isolator, and by changing the temperature of the constant temperature chamber, the temperature adaptation range of the isolator is tested.

2. The offline detection tool for transmitter signal isolator according to claim 1, characterized in that: Connect the isolator test cable, use the manual adjuster to adjust the adjustable electronic load, adjustable power supply and adjustable output source respectively, record the output status of the isolator, and manually determine whether the isolator is working properly.

3. The offline detection tool for transmitter signal isolator according to claim 1, characterized in that: Connect the isolator test cable and press the test start switch. The automatic controller will automatically adjust the adjustable power supply, adjustable output source, adjustable electronic load and constant temperature box temperature according to the preset plan. According to the preset input and output logical relationship, it will automatically determine whether the isolator is normal. The test results will be displayed on the LCD screen.

4. The offline detection tool for transmitter signal isolator according to claim 1, characterized in that: The test start switch is the trigger of the automatic test function. Press the switch to start the automatic controller to run and perform the test according to the preset plan.

5. The offline detection tool for transmitter signal isolator according to claim 1, characterized in that: The LCD is used to display measurement results, adjustable power supply, adjustable output source, adjustable electronic load and real-time data of the constant temperature box temperature.

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