Multi-channel residual current monitoring device current precision automatic test system and test method

Abstract

The invention relates to a multi-channel residual current monitoring device current precision automatic test system and a test method thereof. The multi-channel residual current monitoring device current precision automatic test system is provided with a touch all-in-one machine, a PLC module, a modular communication management machine, an isolation transformer, a switching power supply, a current mutual inductance control module, an indicating lamp and a buzzer. The beneficial effects of the invention are as follows: 1, automation and all-weather sustainable control and monitoring of the test process are realized through the PLC module; 2, through the touch type all-in-one machine, multi-channel full-automatic closed-loop test of the precision of the residual current monitoring device and dynamic monitoring test of the whole process are realized, and the reliability of a test result and the plastic property of original data are ensured; 3, automatic calculation of test data, automatic judgment of a test result and automatic generation of a test report are also realized; and 4, the system has a power supply monitoring function and a test current closed-loop monitoring function, so that the reliability and the safety in an automatic test process are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of residual current monitoring device testing, and in particular to a current accuracy automatic testing system and a testing method for a multi-channel residual current monitoring device. Background Art

[0002] The residual current monitoring device is a device used to monitor the residual current of the AC system of the substation, such as the residual current of the AC power system. In the AC power system of the substation, the vector sum of the current of each phase line and the neutral line is not zero. The residual current monitoring device is mainly divided into two parts: the current transformer to be measured and the data acquisition unit. It can be flexibly configured according to different installation locations. There are two installation locations, the system neutral point grounding point and each circuit of the station distribution panel. The residual current monitoring device can not only monitor the residual current of the AC system of the substation in real time, but also issue an alarm in time when an abnormality occurs to avoid safety problems caused by excessive residual current. The main function of the residual current monitoring device is to monitor the residual current of the AC system of the substation and upload the monitoring data to the background main station. Since it has no data display function, the monitoring data cannot be directly observed from the device. In addition, due to the different installation locations of the residual current monitoring device, the amount of current accuracy test data of the residual current monitoring device is large, and the current transformer to be measured needs to be adjusted to different states during the test. Mainly from this perspective, the automatic test of the current accuracy of the residual current monitoring device is very difficult.

[0003] The current conventional test method for current accuracy test of residual current monitoring device is manual operation, the test data volume is large, the test cycle is long, the whole test process cannot achieve real-time and closed-loop monitoring, and the test results need to be manually recorded, calculated and judged, which cannot reliably ensure the accuracy of test data and the reliability of test results.

[0004] The main shortcomings of the current residual current monitoring device are as follows: 1. The test process requires manual operation to change the state of the current transformer under test, and the labor cost investment is relatively large; 2. The entire test process cannot achieve real-time and closed-loop monitoring, and the accuracy of the test results cannot be guaranteed; 3. The test process data, test result determination, and test report preparation can only be done through manual operation, and there are certain hidden dangers of human error, which may lead to unnecessary repeated tests, which is not conducive to improving the efficiency and reliability of the test; 4. Abnormal situations in the test process cannot be discovered and handled in the first time, which is not conducive to improving the safety of the test process.

[0005] Therefore, in view of the shortcomings of the prior art, it is necessary to provide a multi-channel residual current monitoring device current accuracy automatic testing system and testing method to solve the shortcomings of the prior art. Summary of the invention

[0006] One of the purposes of the present invention is to avoid the shortcomings of the prior art and provide a multi-channel residual current monitoring device current accuracy automatic test system. The multi-channel residual current monitoring device current accuracy automatic test system can dynamically monitor the test process throughout the entire process, ensure the reliability of the test results and the original data scalability, and can automatically generate a test report, thereby improving reliability and safety.

[0007] The above-mentioned purpose of the present invention is achieved by the following technical measures:

[0008] Provided is a multi-channel residual current monitoring device current accuracy automatic testing system, comprising:

[0009] Touch-type integrated machine - set test parameters, control the operation of the current mutual inductance control module, PLC module and programmable current source, receive monitoring data and test data from the PLC module, obtain test results and generate test reports based on the test data, and display test data in real time;

[0010] PLC module - monitors the isolation transformer, programmable current source and switching power supply to obtain monitoring data; controls the operation of the current mutual inductance control module, the indicator light and the buzzer to obtain test data; and simultaneously sends the monitoring data and the test data to the touch-type integrated machine in real time; the monitoring data is the voltage data of the isolation transformer, the current data of the programmable current source and the state data of the switching power supply; the test data is the current output data of the programmable current source, the motion data of the current mutual inductance control module, the indication data of the indicator light and the alarm data of the buzzer;

[0011] Modular communication management machine - used for communication between the touch-type integrated machine and the PLC module, program-controlled current source and the device under test;

[0012] Isolation transformer - provides working power for the switching power supply, modular communication management machine and PLC module;

[0013] Switching power supply - provides power to the touch-type integrated machine and current mutual sensing control module;

[0014] Programmable current source - provides multiple independent AC current sources to the device under test, so that the device under test can be tested for accuracy and connected to the isolation transformer;

[0015] Current transformer control module - controls the movement of the current transformer under test in the device under test;

[0016] Indicator light – indicates system status;

[0017] Buzzer - issues an alarm when the system is abnormal.

[0018] Preferably, the above-mentioned current transformer control module is provided with a rotating component that enables the current transformer under test to rotate 360° with the axis of the current transformer under test as the rotating axis, and a swinging component that enables the current transformer under test to swing left and right. The rotating component and the swinging component are respectively connected to the switching power supply, and the rotating component and the swinging component are also respectively connected to the PLC module. The rotating component and the swinging component are also respectively detachably assembled with the current transformer under test.

[0019] When the current transformer under test is in a non-moving state, the axis is parallel to the horizontal plane; when the current transformer under test swings left and right, the current transformer under test swings left and right within the range of A to 180°-A between the axis and the horizontal plane.

[0020] Preferably, the rotating assembly is provided with a first servo motor and a first linkage part, the first servo motor is connected to the switching power supply and the PLC module, the first linkage part is transmission-connected to the first servo motor, and the first linkage part is also detachably connected to the current transformer under test.

[0021] Preferably, the above-mentioned swing assembly is provided with a second servo motor and a second linkage part, the second servo motor is connected to the switching power supply and the PLC module, the second linkage part is transmission-connected to the second servo motor, and the second linkage part is also detachably connected to the current transformer under test.

[0022] When the rotating assembly controls the movement of the current transformer under test, the second linkage part is disconnected from the current transformer under test; when the swinging assembly controls the movement of the current transformer under test, the first linkage part is disconnected from the current transformer under test.

[0023] Preferably, the above-mentioned PLC module is provided with a digital output channel, a digital input channel, an analog channel and a CUP unit.

[0024] Preferably, the digital output channel is connected to the programmable current source, and controls the programmable current source to operate according to the current output data.

[0025] Preferably, the digital output channel is connected to the programmable current source, and the digital output channel controls the isolation transformer to work according to the instruction of the touch-type integrated machine, thereby controlling the on and off of the programmable current source.

[0026] Preferably, the digital output channel is connected to the indicator light, and controls the indicator light to work according to the indication data.

[0027] Preferably, the digital output channel is connected to the buzzer, and controls the buzzer to work according to the alarm data.

[0028] Preferably, the digital quantity input channel is connected to the switching power supply, and monitors the power supply status of the switching power supply and obtains status data.

[0029] Preferably, the analog channel is connected to the isolation transformer, and monitors the output voltage value of the isolation transformer to obtain voltage data.

[0030] Preferably, the analog channel is connected to the programmable current source, and monitors the current output data of the programmable current source to obtain current data.

[0031] Preferably, the CUP unit uploads the monitoring data and the test data to the touch-type integrated machine in real time.

[0032] Preferably, the above-mentioned digital output channel is provided with Q0.0 channel, Q0.1 channel, Q0.2 channel, Q0.3 channel, Q0.4 channel and Q0.5 channel, the Q0.1 channel and the Q0.1 channel are respectively connected to the indicator light, the Q0.2 channel is connected to the buzzer, the Q0.3 channel is connected to the first servo motor, the Q0.4 channel is connected to the second servo motor, and the Q0.5 channel is connected to the isolation transformer.

[0033] When there is a system abnormality, the Q0.0 channel changes from normally open to normally closed, the indicator light prompts a fault, the Q0.2 channel changes from normally open to normally closed, and the buzzer issues an alarm. The system abnormality is at least one of the power supply abnormality of the switching power supply, the output abnormality of the isolation transformer, or the output abnormality of the programmable current source.

[0034] When the test fails, the Q0.1 channel changes from normally open to normally closed, the indicator light prompts the test result, the Q0.2 channel changes from normally open to normally closed, and the buzzer sounds an alarm.

[0035] When the current transformer under test needs to swing left and right, the Q0.3 channel changes from normally open to normally closed, the first servo motor starts, and the first linkage part rotates at the same time. The angle between the axis and the horizontal plane of the current transformer under test is defined as A. The current transformer under test swings left and right at the two angles of A and 180°-A, and A is 45°.

[0036] When the current transformer under test needs to rotate, the Q0.4 channel changes from normally open to normally closed, the second servo motor is started, and the second linkage part rotates at the same time, and the current transformer under test rotates 360° around the axis.

[0037] When the touch-type integrated machine determines that the output of the programmable current source is abnormal, the Q0.5 channel is changed from normally closed to normally open, and finally the input current of the programmable current source is cut off.

[0038] Preferably, the digital quantity input channel is provided with an I0.0 channel, and the I0.0 channel is connected to the switching power supply.

[0039] When the switching power supply is abnormal, the I0.0 channel is closed; when the switching power supply is normal, the I0.0 channel is closed.

[0040] Preferably, the above-mentioned analog channel is provided with an AE00 channel for real-time monitoring of the output voltage of the isolation transformer, an AE01 channel for real-time monitoring of the current output data of the programmable current source channel A, and an AE02 channel for real-time monitoring of the current output data of the programmable current source channel B. The AE00 channel is connected to the isolation transformer, and the AE01 channel and the AE02 channel are respectively connected to the programmable current source.

[0041] The touch-type integrated machine of the present invention is provided with:

[0042] Parameter setting unit - set test parameters;

[0043] Control unit - controls the indicator light, the buzzer, the first servo motor and the second servo motor to work, and controls the on and off of the program-controlled current source according to the current theoretical output value of the program-controlled current source and the current actual output value monitored by the PLC module;

[0044] Status monitoring unit - monitoring the communication status between the touch-type integrated machine and the PLC module, the program-controlled current source and the device under test, and monitoring whether there is a system abnormality;

[0045] Data display and storage unit - receiving the monitoring data and test data of the PLC module, displaying and storing the monitoring data and test data, and displaying and storing the abnormal information of the automatic test unit;

[0046] Automatic test unit - performs accuracy test on the device under test according to the test parameters of the parameter setting unit, stops the test when an abnormality occurs in the test, and sends the abnormality information to the data display and storage unit in real time;

[0047] Test report automatic generation unit - generates a test report after the test is completed.

[0048] Preferably, the above test parameters are at least one of test item selection, test point, test loop, voltage alarm limit, accuracy level, number of repetitions or data storage interval.

[0049] When the test parameter is a test item selection, the test item selection is at least one of a direct test, a synthetic test, or a balance test.

[0050] When the test parameter is a test point, the test point is at least one of 0% In, 20% In, 40% In, 60% In, 80% In or 100% In.

[0051] When the test parameter is a test loop and the device under test is provided with a plurality of current sensors under test, the test loop is the corresponding current sensor under test.

[0052] Preferably, the PLC module communicates with the modular communication management machine via Ethernet using the Modbus protocol.

[0053] Another object of the present invention is to avoid the shortcomings of the prior art and provide a method for automatically testing the current accuracy of a multi-channel residual current monitoring device. The method can dynamically monitor the test process throughout the entire process, ensure the reliability of the test results and the original data reproducibility, and can automatically generate a test report, thereby improving reliability and safety.

[0054] The above-mentioned purpose of the present invention is achieved by the following technical measures:

[0055] Provided is a method for automatically testing the current accuracy of a multi-channel residual current monitoring device, which uses a multi-channel residual current monitoring device current accuracy automatic testing system with high diagnosability for testing, including the following steps:

[0056] S1, turn on, enter S2;

[0057] S2, confirm the communication status and determine whether there is any abnormality in the communication. If yes, an alarm is issued and the status is reconfirmed, and the alarm data is displayed and stored in real time. If no, enter S3;

[0058] S3, confirm the state of the current sensor under test, and determine whether the current sensor under test is abnormal. If it is abnormal, an alarm is issued and the state is reconfirmed, and the motion data is displayed and stored in real time. If it is not abnormal, enter S4;

[0059] S4, configure test parameters and enter S5;

[0060] S5, the digital output channel of the PLC module controls the operation of the current mutual inductance control module, the touch-type integrated machine displays and stores the motion data of the current mutual inductance control in real time, and enters S6;

[0061] S6, start the programmable current source, and determine whether the applied current is normal. If not, give an alarm and restart the programmable current source, and display and store the current output data of the programmable current source in real time. If yes, enter S7;

[0062] S7, the touch-type integrated machine reads the current of the current transformer under test in real time, and determines whether the current accuracy meets the requirements. If not, an alarm is issued and the current of the current transformer under test is displayed and stored in real time, and the current returns to S2 at the same time. If yes, the current enters S8;

[0063] S8, initialization is performed, the touch-type integrated machine outputs a test report, and then enters S9;

[0064] S9. End the test.

[0065] The multi-channel residual current monitoring device current accuracy automatic test system and test method of the present invention, wherein the multi-channel residual current monitoring device current accuracy automatic test system is provided with: a touch-type integrated machine, which sets test parameters, controls the operation of a current mutual inductance control module, a PLC module and a programmable current source, receives monitoring data and test data of the PLC module, obtains test results and generates a test report according to the test data, and displays the test data in real time; the PLC module monitors the isolation transformer, the programmable current source and the switching power supply to obtain monitoring data; controls the operation of the current mutual inductance control module, the indicator light and the buzzer to obtain test data; and simultaneously sends the monitoring data and the test data to the touch-type integrated machine in real time; the monitoring data is the voltage data of the isolation transformer, the voltage data of the programmable current source ... The test data includes current output data of the programmable current source, movement data of the current mutual inductance control module, indication data of the indicator light and alarm data of the buzzer; a modular communication management machine is used for communication between the touch-type all-in-one machine and the PLC module, the programmable current source and the device under test; an isolation transformer provides working power to the switching power supply, the modular communication management machine and the PLC module; a switching power supply provides power to the touch-type all-in-one machine and the current mutual inductance control module; a programmable current source provides multiple independent AC current sources to the device under test, so that the device under test can be tested for accuracy and connected to the isolation transformer; a current mutual inductance control module controls the movement of the current mutual inductance under test in the device under test; an indicator light indicates the system status; and a buzzer sounds when the system is abnormal. Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the PLC module, the automation and all-weather sustainable control and monitoring of the test process are realized; 2. Through the touch-type all-in-one machine, multi-channel fully automatic closed-loop testing of the accuracy of the residual current monitoring device and dynamic monitoring testing of the whole process are realized to ensure the reliability of the test results and the plasticity of the original data; 3. The present invention also realizes automatic calculation of test data, automatic determination of test results and automatic generation of test reports; 4. The present invention has power supply monitoring function and test current closed-loop monitoring function to ensure reliability and safety in the automatic testing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0067] Figure 1 This is a connection diagram of the current accuracy automatic test system for multi-channel residual current monitoring devices.

[0068] Figure 2 Schematic diagram of 360° rotation of the current transformer under test.

[0069] Figure 3 Schematic diagram of the rotating shaft of the current transformer under test.

[0070] Figure 4 This is a schematic diagram of the current transformer under test swinging left and right.

[0071] Figure 5 It is a structural schematic diagram of the swing component in a non-moving state.

[0072] Figure 6 It is a schematic diagram of the structure of the swing component when it swings to the left.

[0073] Figure 7 It is a schematic diagram of the structure of the swing component when it swings to the right.

[0074] Figure 8 It is a schematic diagram of the structure of the rotating component.

[0075] Fig. 9 It is a schematic diagram of the structure of the annular airbag in a non-inflated state.

[0076] Fig.10 It is a schematic diagram of the structure of the annular airbag in the inflated state.

[0077] Fig.11 This is a flow chart of the automatic current accuracy testing method for a multi-channel residual current monitoring device according to Example 2.

[0078] exist Figures 1 to 11 Including:

[0079] Touch-type integrated machine 100, modular communication management machine 200, PLC module 300, current mutual inductance control module 400,

[0080] The first servo motor 410, the second servo motor 420,

[0081] The first linkage part 430, the first transmission rod 431, the annular airbag 423,

[0082] The second linkage part 440, the second transmission rod 441, the gear 442, the rack 443, the connecting rod 444, the limit block 445,

[0083] Isolation transformer 500, programmable current source 600, switching power supply 700,

[0084] Device under test 800, current transformer under test 810, data acquisition device 820,

[0085] Indicator light 900 and buzzer 1000 . DETAILED DESCRIPTION

[0086] The technical solution of the present invention is further described in conjunction with the following embodiments.

[0087] Example 1

[0088] A multi-channel residual current monitoring device current accuracy automatic test system, such as Figure 1 As shown, the settings are:

[0089] Touch-type integrated machine 100 - sets test parameters, controls the operation of current mutual inductance control module 400, PLC module 300 and programmable current source 600, receives monitoring data and test data from PLC module 300, obtains test results and generates test reports based on the test data, and displays test data in real time;

[0090] PLC module 300 - monitors the isolation transformer 500, the programmable current source 600 and the switching power supply 700 to obtain monitoring data; controls the current mutual inductance control module 400, the indicator light 900 and the buzzer 1000 to obtain test data; and simultaneously sends the monitoring data and the test data to the touch-type integrated machine 100 in real time; the monitoring data are the voltage data of the isolation transformer 500, the current data of the programmable current source 600 and the state data of the switching power supply 700; the test data are the current output data of the programmable current source 600, the motion data of the current mutual inductance control module 400, the indication data of the indicator light 900 and the alarm data of the buzzer 1000;

[0091] Modular communication management machine 200 - used for communication between touch-type integrated machine 100 and PLC module 300, program-controlled current source 600 and device under test 800;

[0092] Isolation transformer 500 - provides working power to the switching power supply 700, modular communication management machine 200 and PLC module;

[0093] Switching power supply 700 - provides power to the touch-type integrated machine 100 and the current mutual inductance control module 400;

[0094] Programmable current source 600 - provides multiple independent AC current sources to the device under test 800, so that the device under test 800 can be tested for accuracy, and is connected to the isolation transformer 500;

[0095] Current transformer control module 400 - controls the movement of the current transformer 810 under test in the device under test 800;

[0096] Indicator light 900 - indicates system status;

[0097] Buzzer 1000 - issues an alarm when the system is abnormal.

[0098] It should be noted that the input of the isolation transformer 500 of the present invention is AC 220V, and the output is also AC 220V, and the isolation transformer 500 is a transformer with an isolation function. When there is external interference, the isolation transformer 500 can prevent interference, and the isolation transformer 500 can ensure the reliability of the output AC 220V. The input of the switching power supply 700 of the present invention is AC 220V, and the output is DC 24V.

[0099] like Figures 2 to 4 The current transformer control module 400 is provided with a rotating component that enables the measured current transformer 810 to rotate 360° with the axis of the measured current transformer 810 as the rotating axis, and a swinging component that enables the measured current transformer 810 to swing left and right. The rotating component and the swinging component are respectively connected to the switching power supply 700, and the rotating component and the swinging component are also respectively connected to the PLC module 300. The rotating component and the swinging component are also respectively detachably assembled with the measured current transformer 810.

[0100] When the current transformer under test needs to swing left and right, the Q0.3 channel changes from normally open to normally closed, the first servo motor starts, and the first linkage part rotates at the same time. The angle between the axis and the horizontal plane of the current transformer under test is defined as A. The current transformer under test swings left and right at the two angles of A and 180°-A, where A is 45°.

[0101] The rotating assembly is provided with a first servo motor 410 and a first linkage part 430 . The first servo motor 410 is connected to the switching power supply 700 and the PLC module 300 . The first linkage part 430 is transmission-connected to the first servo motor 410 . The first linkage part 430 is also detachably connected to the current transformer 810 under test.

[0102] The swing assembly is provided with a second servo motor 420 and a second linkage part 440. The second servo motor 420 is connected to the switching power supply 700 and the PLC module 300. The second linkage part 440 is transmission-connected to the second servo motor 420. The second linkage part 440 is also detachably connected to the current transformer 810 under test.

[0103] When the rotating assembly controls the measured current transformer 810 to move, the second linkage part 440 is disconnected from the measured current transformer 810; when the swinging assembly controls the measured current transformer 810 to move, the first linkage part 430 is disconnected from the measured current transformer 810.

[0104] It should be noted that the focus of the present invention is the overall control method of the touch-type integrated machine 100, the PLC module 300, the modular communication management machine 200, the isolation transformer 500, the switching power supply 700 and the current mutual inductance control module 400, and the specifics of the first linkage part 430 and the second linkage part 440 are not the focus of the present invention. The axis of the driving cylindrical object (such as the current transformer 810 under test) is used as the rotating shaft to rotate 360°, and the current transformer 810 under test swings left and right as conventional driving. As long as the current transformer 810 under test can be rotated 360° and swung left and right, it belongs to the protection scope of the present invention. Moreover, when the current transformer 810 under test rotates 360°, the second linkage part 440 can be disconnected from the current transformer 810 under test manually or automatically; when the current transformer 810 under test swings left and right, the first linkage part 430 can be disconnected from the current transformer 810 under test manually or automatically.

[0105] This embodiment is described by taking the following structures of the first linkage part 430 and the second linkage part 440, and the device under test 800 is provided with three current transformers under test 810 as an example, and the current transformers under test 810 are vertically placed on a plane with a certain friction force, which is a horizontal plane.

[0106] like Figures 5 to 7 The first linkage part 430 is provided with a first transmission rod 431, which is fixedly connected to the rotating shaft of the first servo motor 410. The first transmission rod 431 is inserted into the central through hole of the current transformer 810 to be measured in sequence. When the first servo motor 410 rotates, the first transmission rod 431 rotates to drive the current transformer 810 to be measured to rotate 360° around the rotating shaft. When the first linkage part 430 is manually disconnected, a washer is provided between the first transmission rod 431 and the central through hole of the current transformer 810 to be measured. The washer is interference-connected between the first transmission rod 431 and the current transformer 810 to be measured, so that the current transformer 810 to be measured is driven to rotate when the first transmission rod 431 rotates. When the connection is disconnected, only the washer needs to be removed. When the first linkage part 430 is automatically disconnected, an annular airbag 423 is added between the first transmission rod 431 and the current transformer 810 under test. When the current transformer 810 under test needs to rotate 360°, the annular airbag 423 is inflated to make the annular airbag 423 interference-connected between the first transmission rod 431 and the current transformer 810 under test; when the connection needs to be released, the gas in the annular airbag 423 only needs to be discharged.

[0107] like Figures 8 to 10The second linkage part 440 is provided with a second transmission rod 441, a gear 442, a rack 443, a plurality of connecting rods 444 and a plurality of pairs of limit blocks 445 for limiting the swing position of the current transformer 810 under test. The second transmission rod 441 is fixedly connected to the rotating shaft of the second servo motor 420, the second linkage part 440 is fixedly connected to the gear 442, the gear 442 and the rack 443 are meshed, one end of the connecting rod 444 is axially connected to the rack 443 respectively, and the other end of the connecting rod 444 is axially connected to the curved edge of the current transformer 810 under test, and the limit blocks 445 are fixed on the plane. The number of connecting rods 444 and the number of pairs of limit blocks 445 correspond one-to-one to the number of current transformers 810 under test.

[0108] When the second servo motor 420 rotates forward, the rack 443 moves to the left. Due to the friction between the measured current transformer 810 and the plane, the measured current transformer 810 is driven to swing to one side through the connecting rod 444 and abuts against the limit block 445 on one side. When the second servo motor 420 rotates reversely, the rack 443 moves to the right, and the measured current transformer 810 is driven to swing to the other side through the connecting rod 444 and abuts against the limit block 445 on the other side, thereby forming a left-right swing. When the measured current transformer 810 rotates 360°, all connections between the measured current transformer 810 and the first linkage part 430 are manually removed. When in automatic mode, the connecting rod 444 can be replaced with a connecting rope with a certain elasticity. When the rack 443 moves left and right, the connecting rod 444 directly drives the current transformer 810 under test to swing left and right; when the current transformer 810 under test needs to rotate 360°, since the second servo motor 420 and the gear 442 are fixed, the connecting rope will be deformed and stretched, and rotate with the current transformer 810 under test.

[0109] The PLC module 300 is provided with a digital quantity output channel, a digital quantity input channel, an analog quantity channel and a CPU unit.

[0110] The digital output channel is connected to the isolation transformer 500, and the digital output channel controls the isolation transformer 500 to work according to the instruction of the touch-type integrated machine 100, thereby controlling the on and off of the program-controlled current source 600. The digital output channel is connected to the current mutual inductance control module 400, and controls the current mutual inductance control module 400 to work according to the motion data. The digital output channel is connected to the indicator light 900, and controls the indicator light 900 to work according to the indication data. The digital output channel is connected to the buzzer 1000, and controls the buzzer 1000 to work according to the alarm data.

[0111] Among them, the digital output channels are provided with Q0.0 channel, Q0.1 channel, Q0.2 channel, Q0.3 channel, Q0.4 channel and Q0.5 channel, Q0.1 channel and Q0.1 channel are respectively connected to the indicator light 900, Q0.2 channel is connected to the buzzer 1000, Q0.3 channel is connected to the first servo motor 410, Q0.4 channel is connected to the second servo motor 420, and Q0.5 channel is connected to the isolation transformer 500.

[0112] When there is a system abnormality, the Q0.0 channel changes from normally open to normally closed, the indicator light 900 prompts a fault, the Q0.2 channel changes from normally open to normally closed, and the buzzer 1000 issues an alarm. The system abnormality is at least one of the power supply abnormality of the switching power supply 700, the output abnormality of the isolation transformer 500, or the output abnormality of the programmable current source 600.

[0113] When the test fails, the Q0.1 channel changes from normally open to normally closed, the indicator light 900 prompts the test result, the Q0.2 channel changes from normally open to normally closed, and the buzzer 1000 issues an alarm.

[0114] When the current transformer 810 under test needs to swing left and right, the Q0.3 channel changes from normally open to normally closed, the first servo motor 410 is started, and the first linkage part 430 rotates at the same time, so that the current transformer 810 under test swings left and right within the range of A to 180°-A between the axis and the horizontal plane.

[0115] When the current transformer 810 under test needs to rotate, the Q0.4 channel changes from normally open to normally closed, the second servo motor 420 is started, and the second linkage part 440 rotates at the same time, and the current transformer 810 under test rotates 360 degrees around the axis. When the touch-type integrated machine 100 determines that the output of the programmable current source 600 is abnormal, the Q0.5 channel changes from normally closed to normally open, and finally cuts off the input current of the programmable current source 600.

[0116] The digital input channel is connected to the switching power supply 700, and monitors the power supply status of the switching power supply 700 and obtains status data. Among them, the digital input channel is provided with an I0.0 channel, and the I0.0 channel is connected to the switching power supply 700. When the switching power supply 700 is abnormal, the I0.0 channel is closed; when the switching power supply 700 is normal, the I0.0 channel is closed.

[0117] The analog channel is connected to the isolation transformer 500, and monitors the output voltage value of the isolation transformer 500 and obtains voltage data. The analog channel is connected to the programmable current source 600, and monitors the current output data of the programmable current source 600 and obtains current data. Among them, the analog channel is provided with an AE00 channel for real-time monitoring of the output voltage of the isolation transformer 500, an AE01 channel for real-time monitoring of the current output data of channel A of the programmable current source 600, and an AE02 channel for real-time monitoring of the current output data of channel B of the programmable current source 600. The AE00 channel is connected to the isolation transformer 500, and the AE01 channel and the AE02 channel are respectively connected to the programmable current source 600.

[0118] The CPU unit uploads the monitoring data and the test data to the touch-type integrated machine 100 in real time.

[0119] The touch-type integrated machine 100 of the present invention is provided with:

[0120] Parameter setting unit - setting test parameters, and the test parameters of the present invention are at least one of test item selection, test point, test loop, voltage alarm limit, accuracy level, number of repetitions or data storage interval time. When it is a test item selection, it is at least one of direct test, synthetic test or balance test; when it is a test point, it is at least one of 0% In, 20% In, 40% In, 60% In, 80% In or 100% In; when it is a test loop and the device under test 800 is provided with multiple current sensors under test, the test loop is the corresponding current sensor under test. The device under test 800 of the present invention can be provided with only one

[0121] The accuracy level is used as the basis for judging whether the test data is qualified. The unit of the accuracy level is percentage. The calculation accuracy level is determined according to the actual standard. The number of repetitions means that after the first test fails, the system will repeat the test on the unqualified data. The specific setting of the number of repetitions is 0, 1, 2, 3, etc. The voltage alarm limit value is too large or too small when the output voltage of the isolation transformer 500 is too large, which will affect the normal operation of the system. Therefore, a limit value needs to be set. When the output voltage of the isolation transformer 500 exceeds the limit value, the system will sound an alarm and stop working. The voltage alarm limit value is set according to the actual situation.

[0122] Control unit - controls the indicator light 900, buzzer 1000, first servo motor 410 and second servo motor 420 to work; and controls the on and off of the programmable current source 600 according to the theoretical current output value of the programmable current source 600 and the actual current output value monitored by the PLC module 300; specifically, controls the indicator light 900 to light up or go out, the buzzer 1000 to start or stop, and the first servo motor 410 and the second servo motor 420 to start or stop.

[0123] Status monitoring unit - monitors the communication status between the touch-type integrated machine 100 and the PLC module 300, the programmable current source 600 and the device under test 800, and monitors whether there is a system abnormality, which specifically refers to the power supply abnormality of the switching power supply 700, the output abnormality of the isolation transformer 500, and the output abnormality of the programmable current source 600.

[0124] Data display and storage unit - receives monitoring data and test data from the PLC module 300, displays and stores the monitoring data and test data, and also displays and stores abnormal information of the automatic test unit.

[0125] Automatic test unit: performs accuracy test on the device under test 800 according to the test parameters of the parameter setting unit, stops the test when an abnormality occurs, and sends the abnormality information to the data display and storage unit in real time.

[0126] Test report automatic generation unit - generates a test report after the test is completed.

[0127] The PLC module 300 of the present invention communicates with the modular communication management machine 200 via Ethernet using the Modbus protocol. That is, the test data and test results of the PLC module 300 are transmitted via the Modbus protocol of Ethernet and sent from the modular communication management machine 200 to the touch-type integrated machine 100.

[0128] The model of the modular communication management machine 200 of the present invention is ANet-2E4SM modular communication management machine 200, the model of the touch-type integrated machine 100 is P15-01 touch-type integrated machine 100, the model of the digital input channel and the digital input channel of the PLC module 300 is SIMATIC S7-200 SMART SR60, and the model of the analog channel is EM AE08. The model of the program current source is KA6002D, the model of the isolation transformer 500 is BK100D07A, the model of the switching power supply 700 is NDR-240-24, and the model of the first servo motor 410 and the second servo motor is CC-M3H075-NN14. The device under test 800 of the present invention includes a current transformer 810 under test and a data acquisition device 820, wherein the data acquisition device 820 is used to collect the current of the current transformer 810 under test, and the data acquisition device 820 is connected to the modular communication management machine 200.

[0129] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the PLC module 300, the automation and all-weather sustainable control and monitoring of the test process are realized; 2. Through the touch-type all-in-one machine 100, multi-channel fully automatic closed-loop testing of the accuracy of the residual current monitoring device and dynamic monitoring testing of the whole process are realized to ensure the reliability of the test results and the plasticity of the original data; 3. The present invention also realizes automatic calculation of test data, automatic determination of test results and automatic generation of test reports; 4. The present invention has power supply monitoring function and test current closed-loop monitoring function to ensure reliability and safety in the automatic testing process.

[0130] Example 2

[0131] A method for automatically testing the current accuracy of a fault indicator, such as Fig.11 As shown, the current accuracy automatic testing system of the multi-channel residual current monitoring device of Example 1 is used for testing, including the following steps:

[0132] S1, turn on, enter S2;

[0133] S2, confirm the communication status and determine whether there is any abnormality in the communication. If yes, an alarm is issued and the status is reconfirmed, and the alarm data is displayed and stored in real time. If no, enter S3;

[0134] S3, confirm the state of the current sensor under test, and determine whether the current sensor under test is abnormal. If it is abnormal, an alarm is issued and the state is reconfirmed, and the motion data is displayed and stored in real time. If it is not abnormal, enter S4;

[0135] S4, configure test parameters and enter S5;

[0136] S5, the digital output channel of the PLC module 300 controls the current mutual inductance control module 400 to work, the touch-type integrated machine 100 displays and stores the motion data of the current mutual inductance control in real time, and enters S6;

[0137] S6, start the programmable current source 600, and determine whether the applied current is normal. If not, an alarm is given and the programmable current source 600 is restarted. Meanwhile, the current output data of the programmable current source 600 is displayed and stored in real time. If yes, enter S7;

[0138] S7, the touch-type integrated machine 100 reads the current of the current transformer 810 under test in real time, and determines whether the current accuracy meets the requirement. If not, an alarm is issued and the current of the current transformer 810 under test is displayed and stored in real time, and the process returns to S2. If yes, the process enters S8.

[0139] S8, initialization is performed, the touch-type integrated machine 100 outputs a test report, and then enters S9;

[0140] S9. End the test.

[0141] The beneficial effects of the automatic test method for current accuracy of the fault indicator are as follows: 1. Through the PLC module 300, the automation and all-weather sustainable control and monitoring of the test process are realized; 2. Through the touch-type all-in-one machine 100, a multi-channel fully automatic closed-loop test of the accuracy of the residual current monitoring device is realized, and the dynamic monitoring test of the whole process is carried out to ensure the reliability of the test results and the plasticity of the original data; 3. The present invention also realizes the automatic calculation of test data, the automatic determination of test results and the automatic generation of test reports; 4. The present invention has a power supply monitoring function and a test current closed-loop monitoring function to ensure the reliability and safety of the automatic testing process.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A multi-channel residual current monitoring device current accuracy automatic test system, characterized in that: The settings are: Touch-type integrated machine - set test parameters, control the operation of the current mutual inductance control module, PLC module and programmable current source, receive monitoring data and test data from the PLC module, obtain test results and generate test reports based on the test data, and display test data in real time; PLC module - monitors the isolation transformer, programmable current source and switching power supply to obtain monitoring data; controls the operation of the current mutual inductance control module, the indicator light and the buzzer to obtain test data; and simultaneously sends the monitoring data and the test data to the touch-type integrated machine in real time; the monitoring data is the voltage data of the isolation transformer, the current data of the programmable current source and the state data of the switching power supply; the test data is the current output data of the programmable current source, the motion data of the current mutual inductance control module, the indication data of the indicator light and the alarm data of the buzzer; Modular communication management machine - used for communication between the touch-type integrated machine and the PLC module, program-controlled current source and the device under test; Isolation transformer - provides working power for the switching power supply, modular communication management machine and PLC module; Switching power supply - provides power to the touch-type integrated machine and current mutual sensing control module; Programmable current source - provides multiple independent AC current sources to the device under test, so that the device under test can be tested for accuracy and connected to the isolation transformer; Current transformer control module - controls the movement of the current transformer under test in the device under test; Indicator light – indicates system status; Buzzer - issues an alarm when the system is abnormal.

2. The current accuracy automatic test system of a multi-channel residual current monitoring device according to claim 1 is characterized in that: The current transformer control module is provided with a rotating assembly that enables the measured current transformer to rotate 360° with the axis of the measured current transformer as the rotating axis and a swinging assembly that enables the measured current transformer to swing left and right, the rotating assembly and the swinging assembly are respectively connected to the switching power supply, the rotating assembly and the swinging assembly are also respectively connected to the PLC module, and the rotating assembly and the swinging assembly are also respectively detachably assembled with the measured current transformer; When the current transformer under test is in a non-moving state, the axis is parallel to the horizontal plane; when the current transformer under test swings left and right, the current transformer under test swings left and right within the range of an angle between the axis and the horizontal plane of A to 180°-A.

3. The current accuracy automatic test system of a multi-channel residual current monitoring device according to claim 2 is characterized in that: The rotating assembly is provided with a first servo motor and a first linkage part, the first servo motor is connected to the switch power supply and the PLC module, the first linkage part is drivingly connected to the first servo motor, and the first linkage part is also detachably connected to the current transformer under test; The swing assembly is provided with a second servo motor and a second linkage part, the second servo motor is connected to the switch power supply and the PLC module, the second linkage part is drivingly connected to the second servo motor, and the second linkage part is also detachably connected to the current transformer under test; When the rotating assembly controls the movement of the current transformer under test, the second linkage part is disconnected from the current transformer under test; when the swinging assembly controls the movement of the current transformer under test, the first linkage part is disconnected from the current transformer under test.

4. The current accuracy automatic test system of a multi-channel residual current monitoring device according to claim 3 is characterized in that: The PLC module is provided with a digital quantity output channel, a digital quantity input channel, an analog quantity channel and a CPU unit; The digital output channel is connected to the isolation transformer, and the digital output channel controls the isolation transformer to work according to the instruction of the touch-type integrated machine, thereby controlling the on and off of the programmable current source; The digital output channel is connected to the current mutual induction control module, and controls the current mutual induction control module to work according to the motion data; The digital output channel is connected to the indicator light and controls the indicator light to work according to the indication data; The digital output channel is connected to the buzzer and controls the buzzer to work according to the alarm data; The digital quantity input channel is connected to the switching power supply, and monitors the power supply status of the switching power supply and obtains status data; The analog channel is connected to the isolation transformer, and monitors the output voltage value of the isolation transformer and obtains voltage data; The analog channel is connected to the programmable current source, and monitors the current output data of the programmable current source to obtain current data; The CPU unit uploads the monitoring data and the test data to the touch-type integrated machine in real time.

5. The current accuracy automatic test system of a multi-channel residual current monitoring device according to claim 4 is characterized in that: The digital output channel is provided with a Q0.0 channel, a Q0.1 channel, a Q0.2 channel, a Q0.3 channel, a Q0.4 channel and a Q0.5 channel, the Q0.1 channel and the Q0.1 channel are respectively connected to the indicator light, the Q0.2 channel is connected to the buzzer, the Q0.3 channel is connected to the first servo motor, the Q0.4 channel is connected to the second servo motor, and the Q0.5 channel is connected to the isolation transformer; When there is a system abnormality, the Q0.0 channel changes from normally open to normally closed, the indicator light prompts a fault, the Q0.2 channel changes from normally open to normally closed, and the buzzer sounds an alarm. The system abnormality is at least one of the power supply abnormality of the switching power supply, the output abnormality of the isolation transformer, or the output abnormality of the programmable current source; When the test fails, the Q0.1 channel changes from normally open to normally closed, the indicator light prompts the test result, the Q0.2 channel changes from normally open to normally closed, and the buzzer sounds an alarm; When the current transformer under test needs to swing left and right, the Q0.3 channel changes from normally open to normally closed, the first servo motor starts, and the first linkage part rotates at the same time. The angle between the axis and the horizontal plane of the current transformer under test is defined as A. The current transformer under test swings left and right at the two angles of A and 180°-A, and A is 45°. When the current transformer under test needs to rotate, the Q0.4 channel changes from normally open to normally closed, the second servo motor starts, and the second linkage part rotates at the same time, and the current transformer under test rotates 360° around the axis; When the touch-type integrated machine determines that the output of the programmable current source is abnormal, the Q0.5 channel is changed from normally closed to normally open, and finally the input current of the programmable current source is cut off.

6. The current accuracy automatic test system of a multi-channel residual current monitoring device according to claim 5, characterized in that: The digital input channel is provided with an I0.0 channel, and the I0.0 channel is connected to the switching power supply; When the switching power supply is abnormal, the I0.0 channel is closed; when the switching power supply is normal, the I0.0 channel is closed; The analog channel is provided with an AE00 channel for real-time monitoring of the output voltage of the isolation transformer, an AE01 channel for real-time monitoring of the current output data of the programmable current source channel A, and an AE02 channel for real-time monitoring of the current output data of the programmable current source channel B. The AE00 channel is connected to the isolation transformer, and the AE01 channel and the AE02 channel are respectively connected to the programmable current source.

7. The automatic current accuracy test system for a multi-channel residual current monitoring device according to any one of claims 3 to 6, characterized in that: The touch-type integrated machine is provided with: Parameter setting unit - set test parameters; Control unit - controls the indicator light, the buzzer, the first servo motor and the second servo motor to work, and controls the on and off of the program-controlled current source according to the current theoretical output value of the program-controlled current source and the current actual output value monitored by the PLC module; Status monitoring unit - monitoring the communication status between the touch-type integrated machine and the PLC module, the program-controlled current source and the device under test, and monitoring whether there is a system abnormality; Data display and storage unit - receiving the monitoring data and test data of the PLC module, displaying and storing the monitoring data and test data, and displaying and storing the abnormal information of the automatic test unit; Automatic test unit - performs accuracy test on the device under test according to the test parameters of the parameter setting unit, stops the test when an abnormality occurs in the test, and sends the abnormality information to the data display and storage unit in real time; Test report automatic generation unit - generates a test report after the test is completed.

8. The current accuracy automatic test system of a multi-channel residual current monitoring device according to claim 7, characterized in that: The test parameter is at least one of test item selection, test point, test loop, voltage alarm limit, accuracy level, number of repetitions or data storage interval; When the test parameter is a test item selection, the test item selection is at least one of a direct test, a synthetic test, or a balance test; When the test parameter is a test point, the test point is at least one of 0% In, 20% In, 40% In, 60% In, 80% In or 100% In; When the test parameter is a test loop and the device under test is provided with a plurality of current sensors under test, the test loop is the corresponding current sensor under test.

9. The current accuracy automatic test system of a multi-channel residual current monitoring device according to claim 1, characterized in that: The PLC module communicates with the modular communication management machine via Ethernet using the Modbus protocol.

10. A method for automatically testing the current accuracy of a multi-channel residual current monitoring device, characterized in that: The test is performed using the current accuracy automatic test system of the multi-channel residual current monitoring device according to any one of claims 1 to 9, comprising the following steps: S1, turn on, enter S2; S2, confirm the communication status and determine whether there is any abnormality in the communication. If yes, an alarm is issued and the status is reconfirmed, and the alarm data is displayed and stored in real time. If no, enter S3; S3, confirm the state of the current sensor under test, and determine whether the current sensor under test is abnormal. If it is abnormal, an alarm is issued and the state is reconfirmed, and the motion data is displayed and stored in real time. If it is not abnormal, enter S4; S4, configure test parameters and enter S5; S5, the digital output channel of the PLC module controls the operation of the current mutual inductance control module, the touch-type integrated machine displays and stores the motion data of the current mutual inductance control in real time, and enters S6; S6, start the programmable current source, and determine whether the applied current is normal. If not, give an alarm and restart the programmable current source, and display and store the current output data of the programmable current source in real time. If yes, enter S7; S7, the touch-type integrated machine reads the current of the current transformer under test in real time, and determines whether the current accuracy meets the requirements. If not, an alarm is issued and the current of the current transformer under test is displayed and stored in real time, and the current returns to S2 at the same time. If yes, the current enters S8; S8, initialization is performed, the touch-type integrated machine outputs a test report, and then enters S9; S9. End the test.

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