A secondary switch quantity intelligent IoT test system and method

Abstract

The invention discloses a secondary switch quantity intelligent Internet of Things test system and method, comprising a remote master station, a telecontrol device, a measurement and control device and a switch quantity intelligent Internet of Things test device, wherein the remote master station is electrically connected to the measurement and control device through the telecontrol device, and the switch quantity intelligent Internet of Things test device is electrically connected to the test end of the measurement and control device; after the switch quantity intelligent Internet of Things test device and the measurement and control device are connected, stimulation is automatically input to the measurement and control device in sequence according to the sequence of the telesignaling point table, and after receiving the telesignaling signal, the remote master station personnel check whether it is consistent with the point table; the switch quantity intelligent Internet of Things test device comprises: a switch quantity trigger module, a controller, a switch quantity measurement module, a power supply module, an intelligent interaction module and an Internet of Things module; the scheme can automatically perform the telesignaling signal checking work, and can realize the automation of the protection tripping logic verification work, and at the same time has the device Internet of Things and human-computer interaction functions, which significantly improves the point-to-point efficiency of the telesignaling signal and the protection verification work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of power system automation, and in particular to a secondary switch quantity intelligent Internet of Things testing system and method. Background Art

[0002] Relay protection of power system is an important line of defense for the stable operation of power grid. Relay protection involves many input signals such as switch closing position, switch opening position, high oil temperature, etc., as well as output signals such as tripping, reclosing, etc. These signals can be collectively referred to as switch quantity, which is an important type of signal in relay protection. The debugging work related to input signals is mainly the telesignaling signal verification work of traditional substations. Telesignaling verification can confirm the reliable reception and management of telesignaling signals at the substation plant end by the automation master station. At present, the telesignaling verification work of substations is usually carried out in a manual point-to-point manner, that is, the staff at the substation end and the staff at the automation master station contact each other by phone, and the staff at the substation end manually actuates the primary equipment or measurement and control device as input excitation. Then, the automation master station receives the output information corresponding to the input excitation, and manually verifies the action information of the primary equipment input at the substation end with the information received by the automation master station, and finally completes the verification work. The traditional verification method has a low degree of automation. Due to the large number of telesignaling signals and frequent telemotor configuration errors, the verification needs to be repeated many times, resulting in a heavy workload for telesignaling verification. At the same time, manual input of signal excitation is prone to electric shock or DC grounding accidents, which brings great safety risks to maintenance personnel and also buries major safety hazards to the power grid.

[0003] The debugging work related to the output signal is mainly to verify the tripping logic of the protection device. The main transformer protection device, the bus differential protection device, the standby automatic protection device, etc. have many output pressure plates. According to different logics, different time limits, and different rounds, the protection action will trip different operating switches, forming a complex tripping matrix. After the tripping matrix in the protection device is set, in order to verify the correctness of the tripping logic, the maintenance personnel need to test the correctness of the switch corresponding to the protection action output and the correctness of the tripping time. At present, the test method is to conduct a protection function test. The maintenance personnel measure the voltage pulses at each tripping pressure plate one by one, confirm the switch corresponding to the tripping / closing of the protection function, and measure the tripping time at the same time. Due to the lack of suitable test instruments and complicated wiring, maintenance personnel usually need to repeat the same protection function test many times to measure the situation at different pressure plates, which is inefficient and prone to improper coordination, poor contact, fatigue errors, etc.

[0004] At present, there are generally two methods for testing the correctness of the outlet matrix on site. One is to use a multimeter to measure the voltage of the outlet pressure plate to the ground to detect the correctness of the outlet matrix one by one; the other is to use a relay tester to directly measure the closure of the outlet contact; no matter which method is used, it cannot change the complexity of such trip matrix verification work. Taking the 220kV main transformer protection trip matrix verification as an example, there are nearly 20 trip outlet pressure plates. Each protection verification faces 2 sets of main transformer protection with up to 200 trip logics, which requires at least 3 people. If all these 200 logics are verified, multiple professionals are required to cooperate to complete it, 1 person adds the fault simulation, 2 to 3 people measure the outlet pressure plate pulse or record the closure of the outlet contact, and a total of more than 500 outlets need to be measured, and the multimeter cannot verify the outlet time; in the face of this kind of verification with a relatively large workload, at this stage, the traditional method of side classification, segmentation and time limit, and logic and pressure plate inspection is used one by one. And because the trip pulse is a millisecond-level instantaneous voltage pulse, the multimeter cannot verify the exit time of the trip matrix. Even if all relay protection testers are used, the time measurement problem is solved, but the number of switch inputs of commonly used relay protection testers cannot meet the demand. This frequent and repeated operation not only consumes a lot of manpower time, but also easily leads to poor coordination, poor contact, fatigue and errors, which seriously affects the maintenance efficiency and progress. How to use intelligent devices to improve the debugging efficiency and quality of relay protection switch signal and improve the reliability and safety of substation operation is a new technical attempt, and it is also a problem that needs to be solved urgently to improve the current maintenance mode.

[0005] In terms of the intelligence of telesignaling signal verification work, Nanjing NARI's patent "CN201710107316-A remote control device point-to-point system and automatic point-to-point method" and Beijing Sifang Company's patent "CN201711390848-A relay protection information automatic point-to-point method suitable for smart substations" respectively proposed a method for realizing the point-to-point of the remote control device SCD model and the associated protection and measurement and control device ICD model, and a method for using the IEC61850 communication setting process to trigger the station's own simulated point-to-point internal process point-to-point of the relay protection equipment. However, these two methods are mainly used in smart stations and need to be implemented through software systems. They cannot be applied to conventional substations and have limited scope of application.

[0006] In terms of protection tripping logic verification, the device proposed in the literature [Study on Strategies to Improve the Efficiency of Periodic Inspection of Transformer Protection, Master's degree thesis, Cai Zhenman] can light up the indicator light through the voltage pulse of the outlet pressure plate, intuitively display the circuit in action, and can detect 10 circuits at the same time. However, the device cannot measure the protection action time, and it also requires manual judgment whether it is correct, and the overall degree of automation is still not high. Summary of the invention

[0007] The purpose of the present invention is to address the problems pointed out in the background technology and propose a secondary switch quantity intelligent Internet of Things testing system and method. The scheme can automatically perform remote signal verification work and can realize the automation of protection tripping logic verification work. At the same time, it has device Internet of Things and human-computer interaction functions, which significantly improves the work efficiency of secondary switch quantity debugging.

[0008] In order to achieve the above technical purpose, the present invention provides a technical solution, which is a secondary switch quantity intelligent Internet of Things test system, including: a remote master station, a telecontrol device, a measurement and control device, a protection device and a switch quantity intelligent Internet of Things test device, wherein the remote master station is connected to the measurement and control device through the telecontrol device, and the switch quantity intelligent Internet of Things test device is electrically connected to the test end of the measurement and control device; after the switch quantity intelligent Internet of Things test device is connected to the measurement and control device, the excitation is automatically input to the measurement and control device in sequence according to the remote signal point table, and after the remote master station personnel receive the remote signal, they check whether it is consistent with the point table; the switch quantity intelligent Internet of Things test device is electrically connected to the test pressure plate of the protection device, and the electrical quantity is input to the protection device in sequence according to the protection setting single tripping logic matrix sequence, and the switch quantity signal received by the test pressure plate is detected to see whether it is consistent with the tripping logic matrix;

[0009] The switch quantity intelligent IoT test device includes: a switch quantity trigger module, a controller, a switch quantity measurement module, a power supply module, an intelligent interaction module and an IoT module.

[0010] The switch trigger module is connected to the remote signal terminal of the measurement and control device, inputs an excitation signal, and is electrically connected to the controller;

[0011] The switch quantity measurement module is connected to the test pressure plate of the protection device, measures the input protection trip signal, and is electrically connected to the controller;

[0012] The power supply module provides working power to the switch quantity trigger module, the switch quantity measurement module, the intelligent interaction module and the Internet of Things module;

[0013] The intelligent interaction module is used for recognizing voice signals and playing voices, and is electrically connected to the controller;

[0014] The controller is used to perform test operations on the switch quantity signal acquired by the switch quantity measurement module and send an excitation signal control instruction to the switch quantity trigger module;

[0015] The IoT module is electrically connected to the controller to achieve communication and interconnection between the switch quantity intelligent IoT test device and the host computer or terminal.

[0016] In this solution, the intelligent telesignaling signal verification process does not require manual input of excitation to the primary equipment or measurement and control device. Instead, after completing the wiring of the secondary equipment switch quantity intelligent IoT test device and the measurement and control device, the switch quantity trigger module automatically inputs excitation to the measurement and control device in sequence according to the telesignaling point list. After receiving the telesignaling signal, the automation master station personnel check whether it is consistent with the point list; the intelligent protection tripping logic matrix verification does not require manual repeated measurement of the tripping outlet pressure plate. Instead, after completing the wiring of the secondary equipment switch quantity intelligent IoT test device and the protection device, real-time monitoring of multiple tripping outlet pressure plates is performed, the action time is accurately measured, and the matrix is ​​intelligently judged to achieve fast tripping matrix verification.

[0017] Preferably, the switch quantity trigger module is composed of multiple groups of switch quantity trigger sub-modules, the switch quantity trigger sub-module includes an optocoupler relay, the power output end of the optocoupler relay is connected to a jack of the integrated terminal block, the power input end of the optocoupler relay is connected to the power module through a relay switch, the control end of the relay switch is electrically connected to the control end of the controller, and the integrated terminal block is one-to-one connected to the corresponding remote signal terminal by plugging in a wire.

[0018] In this solution, the main components of the switch quantity trigger module are optocoupler relays. The relay is triggered by a 5V DC power supply, and the signal power supply of the measurement and control device and the remote signal terminal are connected through external wiring to input the remote signal excitation. The optocoupler relay is a commonly used solid-state relay. It uses non-mechanical components inside, can operate stably in an impact environment, has a long life, has a fast switching speed, and does not generate electromagnetic interference itself, and has good electromagnetic compatibility. The structure is mostly sealed and airtight, with strong vibration resistance and high reliability. At the same time, in order to solve the problem of cumbersome and time-consuming cable wiring between traditional testers and measurement and control devices, a customized integrated terminal block is plugged into the fixed terminal, which can be directly plugged in and out. It can be quickly fixed by simply tightening the screws, which improves the wiring speed between the secondary equipment switch quantity intelligent IoT test device and the measurement and control device.

[0019] Preferably, the switch quantity measurement module is composed of multiple groups of switch quantity measurement sub-modules, and the switch quantity measurement sub-module includes an optocoupler isolator QP1, the first electrical pin of the optocoupler isolator QP1 is connected to a 12V power supply through a resistor R3, the second electrical pin of the optocoupler isolator QP1 serves as the collector of the transistor Q1, and the third electrical pin of the optocoupler isolator QP1 is connected to the signal acquisition end of the controller; the fourth electrical pin of the optocoupler isolator QP1 is electrically connected to a 5V power supply through a resistor R4, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to a test terminal of the measurement and control device through a resistor R1, and a resistor R2, a capacitor C1 and a diode D1 are connected in parallel between the base and the emitter of the transistor Q1 for protection and filtering.

[0020] In this solution, the switch quantity measurement circuit uses resistors to divide the switch quantity DC pulse voltage, and then uses the optical coupler isolator QP1 to isolate the strong current circuit, and control the weak current circuit to input the switch quantity signal into the controller. The test terminal outlet is the lower end b of the outlet pressure plate and the ground terminal a. When testing, the control power supply KM is turned on; the resistors R1 and R2 are mainly used for voltage division, the role of the diode D1 is to prevent the input end from being damaged due to excessive reverse bias voltage, and the role of the parallel capacitor C1 is to reduce signal interference. Transistor Q1 is used as a switching element, and QP1 is a high-speed optical coupler isolator. When the outlet contact is closed, a +110V (or +220V) DC pulse voltage is generated between IN and COM, the drive circuit is turned on, and after voltage division and strong current isolation, the weak current circuit in the red frame is turned on, and the signal is input into the controller.

[0021] Preferably, a voice recognition unit, a voice playback unit and a relay language library are set in the intelligent interaction module. The relay language library has a wake-up function. The voice recognition unit recognizes external voice information and extracts keywords to trigger corresponding function controls. The voice playback unit feeds back function control information and obtains further confirmation. The parameter values ​​corresponding to each function can be set by voice.

[0022] A secondary switch quantity intelligent IoT test method includes an intelligent remote signal point-to-point method and a protection trip logic matrix intelligent verification method;

[0023] The intelligent remote signal point-to-point method comprises the following steps:

[0024] S11. Confirm that the remote master station, telecontrol device and measurement and control device are communicating normally;

[0025] S12, the switch quantity intelligent IoT test device determines the interface sequence of the measurement and control device according to the telesignal point table provided by the telecontrol master station;

[0026] S13, the switch quantity intelligent IoT test device controls the switch quantity trigger module inside it to continuously send an excitation signal to the excitation segment of the measurement and control device according to the sequence of the remote signal point table;

[0027] S14, the measurement and control device sends a response excitation message to the telecontrol device, and the telecontrol device sends a telesignaling signal to the remote master station for point verification;

[0028] S15. The intelligent interactive module of the switch quantity intelligent IoT test device feeds back the name of the remote signal point and the error type by display or voice broadcast. The power personnel reset the parameters in the function control by touch setting or voice prompt, and execute S11 again.

[0029] A protection tripping logic matrix intelligent verification method comprises the following steps:

[0030] S21. Confirm that the wiring between the protection device and the switch quantity intelligent IoT test device is correct;

[0031] S22. The communication between the switch quantity intelligent IoT test devices and between the switch quantity intelligent IoT test devices and the laptop computer is normal, and the switch quantity intelligent IoT test devices and between the switch quantity intelligent IoT test devices and the laptop computer are wirelessly connected;

[0032] S23, the switch quantity intelligent IoT test device inputs the corresponding electrical quantities in sequence according to the sequence of the single tripping logic matrix set by the protection device, triggers the protection action, and measures the change of the switch quantity of the corresponding tripping outlet pressure plate at the same time, and accurately measures the action time, and compares it with the requirements of the tripping logic matrix to verify the correctness of the tripping logic matrix of the protection device.

[0033] In S23, the matrix logic verification of the tripping includes the tripping circuit verification and the tripping time verification of the corresponding test items. If there is a deviation in one of the items, the maintenance personnel will correct the parameter value in the function control according to the prompt and verify again.

[0034] In S14, the remote master station receives the telesignaling signal sent by the telecontrol device. If the telesignaling signal fails to reach the point, the switch quantity intelligent IoT test device can feedback the fault point number through the intelligent interactive module according to the name of the telesignaling signal, prompting the maintenance personnel to check and repair.

[0035] Beneficial effects of the invention: The intelligent IoT testing system and method for secondary switch quantities of the invention can automatically realize the automatic point-to-point of remote signaling signals, and is provided with an intelligent interactive module for online manual correction; at the same time, it can realize automatic verification of the protection tripping logic matrix and ensure that the switching time of the protection action signal meets actual measurement requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a structural schematic diagram of a secondary switch quantity intelligent Internet of Things testing system.

[0037] Figure 2 This is a circuit structure diagram of the switch trigger submodule of the present invention.

[0038] Figure 3 This is a circuit structure diagram of the switch quantity measurement submodule of the present invention.

[0039] Explanation of the marks in the figure: 1-switching quantity intelligent Internet of Things test device, 2-measurement and control device, 3-telecontrol device, 4-remote master station, 5-protection device, 11-controller, 12-switching quantity trigger module, 13-switching quantity measurement module, 14-intelligent interaction module, 15-Internet of Things module, 16-power supply module. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] Example: Figure 1 As shown, a secondary switch quantity intelligent IoT test system is composed of a remote master station 4, a telecontrol device 3, a measurement and control device 2, a protection device 5 and a switch quantity intelligent IoT test device 1. The remote master station is electrically connected to the measurement and control device through the telecontrol device, and the switch quantity intelligent IoT test device is electrically connected to the test end of the measurement and control device; after the switch quantity intelligent IoT test device is connected to the measurement and control device, the stimulation is automatically input to the measurement and control device in sequence according to the remote signal point table, and after the remote master station personnel receive the remote signal, they check whether it is consistent with the point table; the switch quantity intelligent IoT test device is electrically connected to the test pressure plate of the protection device, and the electrical quantity is input to the protection device in sequence according to the protection setting single trip logic matrix sequence, and the switch quantity signal received by the test pressure plate is detected to see whether it is consistent with the trip logic matrix;

[0042] The switch quantity intelligent IoT test device includes: a switch quantity trigger module 12, a controller 11, a switch quantity measurement module 13, a power supply module 16, an intelligent interaction module 14 and an IoT module 15.

[0043] The switch trigger module is connected to the remote signal terminal of the measurement and control device, inputs an excitation signal, and is electrically connected to the controller;

[0044] The switch quantity measurement module is electrically connected to the test pressure plate of the protection device, measures the input protection trip signal, and is electrically connected to the controller;

[0045] The power supply module provides working power to the switch quantity trigger module, the switch quantity measurement module, the intelligent interaction module and the Internet of Things module;

[0046] The intelligent interaction module is used for recognizing voice signals and playing voices, and is electrically connected to the controller;

[0047] The controller is used to perform test operations on the switch quantity signal obtained by the switch quantity measurement module and send an excitation signal control instruction to the switch quantity trigger module;

[0048] The IoT module is electrically connected to the controller to achieve communication and interconnection between the switch quantity intelligent IoT test device and the host computer or terminal.

[0049] In this embodiment, the intelligent telesignaling signal verification process does not require manual input of excitation to the primary equipment or the measurement and control device. Instead, after completing the wiring of the secondary equipment switch quantity intelligent IoT test device and the measurement and control device, the switch quantity trigger module automatically inputs excitation to the measurement and control device in sequence according to the telesignaling point list. After receiving the telesignaling signal, the automation master station personnel check whether it is consistent with the point list; the intelligent protection tripping logic matrix verification does not require manual repeated measurements of the tripping outlet pressure plate. Instead, after completing the wiring of the secondary equipment switch quantity intelligent IoT test device and the protection device, real-time monitoring of multiple tripping outlet pressure plates is performed, the action time is accurately measured, and the matrix is ​​intelligently judged to be correct, thereby realizing fast tripping matrix verification.

[0050] like Figure 2 As shown, the switch quantity trigger module is composed of multiple groups of switch quantity trigger sub-modules, and the switch quantity trigger sub-module includes an optocoupler relay. The power output end of the optocoupler relay is connected to a jack of the integrated terminal block, and the power input end of the optocoupler relay is connected to the power module through a relay switch. The control end of the relay switch is electrically connected to the control end of the controller, and the integrated terminal block is connected one-to-one with the corresponding remote signal terminal by plugging in a wire.

[0051] In this embodiment, the main components of the switch quantity trigger module are optocoupler relays, which are triggered by a 5V DC power supply to conduct the relay, and the signal power supply of the measurement and control device and the remote signal terminal are connected through external wiring to input the remote signal excitation. The optocoupler relay is a commonly used solid-state relay, which uses non-mechanical components inside and can operate stably in an impact environment. It has a long life and a fast switching speed. It does not generate electromagnetic interference and has good electromagnetic compatibility. The structure is mostly sealed and airtight, which has strong vibration resistance and high reliability. At the same time, in order to solve the problem of cumbersome and time-consuming cable wiring between the traditional test instrument and the measurement and control device, a customized integrated terminal block is plugged into the fixed terminal, which can be directly plugged in and out. It can be quickly fixed by simply tightening the screws, which improves the wiring speed between the secondary equipment switch quantity intelligent IoT test device and the measurement and control device.

[0052] like Figure 3 As shown, the switch quantity measurement module is composed of multiple groups of switch quantity measurement sub-modules, and the switch quantity measurement sub-module includes an optocoupler isolator QP1, a first electrical pin of the optocoupler isolator QP1 is connected to a 12V power supply through a resistor R3, a second electrical pin of the optocoupler isolator QP1 serves as a collector of a transistor Q1, and a third electrical pin of the optocoupler isolator QP1 is connected to a signal acquisition end of a controller; a fourth electrical pin of the optocoupler isolator QP1 is electrically connected to a 5V power supply through a resistor R4, an emitter of the transistor Q1 is grounded, a base of the transistor Q1 is connected to a test terminal of a measurement and control device through a resistor R1, and a resistor R2, a capacitor C1, and a diode D1 are connected in parallel between the base and the emitter of the transistor Q1 for protection and filtering.

[0053] In this embodiment, the switch quantity measurement circuit uses a resistor to divide the switch quantity DC pulse voltage, and then uses the optical coupler isolator QP1 to isolate the strong current circuit, and control the weak current circuit to input the switch quantity signal into the controller. The test terminal outlet is the lower end b of the outlet pressure plate and the ground terminal a. When testing, the control power supply KM is closed; the resistors R1 and R2 are mainly used for voltage division, the role of the diode D1 is to prevent the input terminal from being damaged due to excessive reverse bias voltage, and the role of the parallel capacitor C1 is to reduce signal interference. Transistor Q1 is used as a switching element, and QP1 is a high-speed optical coupler isolator. When the outlet contact is closed, a DC pulse voltage of +110V (or +220V) is generated between IN and COM, the drive circuit is turned on, and after voltage division and strong current isolation, the weak current circuit in the red frame is turned on, and the signal is input into the controller.

[0054] A voice recognition unit, a voice playback unit and a relay language library are set in the intelligent interaction module. The relay language library has a wake-up function. The voice recognition unit recognizes external voice information and extracts keywords to trigger corresponding function controls. The voice playback unit feeds back function control information and obtains further confirmation. The parameter values ​​corresponding to each function can be set by voice.

[0055] A secondary switch quantity intelligent Internet of Things testing method includes an intelligent remote signal point-to-point method and a protection tripping logic matrix intelligent verification method.

[0056] The intelligent remote signal point-to-point method comprises the following steps:

[0057] S11. Confirm that the remote master station, telecontrol device and measurement and control device are communicating normally;

[0058] S12, the switch quantity intelligent IoT test device determines the interface sequence of the measurement and control device according to the telesignal point table provided by the telecontrol master station;

[0059] S13, the switch quantity intelligent IoT test device controls the switch quantity trigger module inside it to continuously send an excitation signal to the excitation segment of the measurement and control device according to the sequence of the remote signal point table;

[0060] S14, the measurement and control device sends response excitation information to the telecontrol device, and the telecontrol device sends the telesignaling signal to the remote master station for point verification; the remote master station receives the telesignaling signal sent by the telecontrol device. If the telesignaling signal fails to point, the switch quantity intelligent IoT test device can feedback the fault point number through the intelligent interactive module according to the name of the telesignaling signal, prompting the maintenance personnel to check and repair;

[0061] S15. The intelligent interactive module of the switch quantity intelligent IoT test device feeds back the name of the remote signal point and the error type by display or voice broadcast. The power personnel reset the parameters in the function control by touch setting or voice prompt, and execute S11 again.

[0062] The protection tripping logic matrix intelligent verification method comprises the following steps:

[0063] S21. Confirm that the wiring between the protection device and the switch quantity intelligent IoT test device is correct;

[0064] S22. The communication between the switch quantity intelligent IoT test devices and between the switch quantity intelligent IoT test devices and the laptop computer is normal, and the switch quantity intelligent IoT test devices and between the switch quantity intelligent IoT test devices and the laptop computer are wirelessly connected;

[0065] S23, the switch quantity intelligent IoT test device inputs the corresponding electrical quantities in sequence according to the sequence of the single tripping logic matrix set by the protection device, triggers the protection action, and measures the change of the switch quantity of the corresponding tripping outlet pressure plate at the same time, and accurately measures the action time, and verifies the correctness of the tripping logic matrix of the protection device by comparing it with the requirements of the tripping logic matrix; the matrix logic verification of the tripping includes the tripping circuit verification and tripping time verification of the corresponding test items. If there is a deviation in one of them, the maintenance personnel will correct the parameter value in the function control according to the prompt and verify it again.

[0066] Use the switch quantity intelligent IoT test device to test the switch quantity output function:

[0067] In the switch trigger module, the controller (Atmega 2560 single-chip microcomputer) controls the output high level (5V), which can trigger the optocoupler relay, and then connect the signal power supply of the measurement and control device and the remote signal terminal, triggering the remote signal input.

[0068] In order to measure the correctness of the high level output of the single-chip microcomputer, the 30 digital output terminals of the single-chip microcomputer are set to output a high level for 10 seconds in sequence, and the output voltage value and the duration of the high level are measured to see if they are correct. The test was carried out 5 times in total, and the average results are shown in Table 1:

[0069] Table 1 MCU control output accuracy analysis test results

[0070]

[0071]

[0072] It can be seen from Table 1 that the high-level voltage value deviation and high-level duration deviation at the output terminal of the single-chip microcomputer are both within 1%, and the control accuracy is sufficient to meet the requirements of triggering the remote signal input.

[0073] Use the switch quantity intelligent IoT test device to test the accuracy of the tripping time:

[0074] In order to verify the accuracy of the protection exit time measured by the secondary equipment switch intelligent IoT test device, a 3V high level is added to the 10 analog input terminals of the secondary equipment switch intelligent IoT test device at different times, and the protection action exit time (high level appearance time) measured by the secondary equipment switch intelligent IoT test device is recorded. The test was carried out twice, and the results are shown in Table 2:

[0075] Table 2 Test results of the accuracy analysis of the measured tripping time

[0076]

[0077] It can be seen from Table 2 that the deviation between the recorded protection action exit time and the actual time when the high level is added does not exceed 0.014s, which meets the actual requirements of on-site relay protection verification work.

[0078] In order to verify the effectiveness of the intelligent IoT test device for secondary equipment switch quantity in improving the efficiency of remote signal verification and trip matrix verification, field tests were carried out at 220kV A substation and B substation, and all the tests were conducted by a single person.

[0079] The 110kV line measurement and control device of Hexing Substation was selected for telesignal signal verification. There were 22 telesignal points. The test steps were arranging safety measures, setting the trigger sequence by one person, wiring, dynamic triggering and on-site recovery. The average time for multiple tests was 31 minutes. The results are shown in Table 3.

[0080] Table 3 Statistics of the time used for 110kV line measurement and control remote signaling after using the device (min)

[0081]

[0082]

[0083] The 220kV main transformer protection of Hexing Substation was selected for trip matrix verification. The test steps were safety arrangement, trip matrix system input, wiring, trip matrix intelligent verification, and on-site recovery. The average test time for multiple tests was 42 minutes. The results are shown in Table 4:

[0084] Table 4 Statistics of time used for 220kV main transformer protection tripping matrix test after using the device (min)

[0085] Test No. On-site security measures Debug and log Restoration site Subtotal 1 28 46 26 100 2 31 48 28 107 3 29 43 26 98 4 32 40 29 101 5 28 47 28 103 6 31 46 29 106 7 30 43 29 105 8 28 43 27 98 9 30 44 27 101

[0086] The specific implementation described above is a preferred implementation of a secondary switch quantity intelligent Internet of Things testing system and method of the present invention, and is not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to this specific implementation. All equivalent changes made in accordance with the shape and structure of the present invention are within the protection scope of the present invention.

Claims

1. A secondary switch quantity intelligent IoT test system, characterized in that: The invention comprises: a remote master station, a telecontrol device, a measurement and control device, a protection device and a switch quantity intelligent Internet of Things test device, wherein the remote master station is connected to the measurement and control device through the telecontrol device, and the switch quantity intelligent Internet of Things test device is electrically connected to the test end of the measurement and control device; after the switch quantity intelligent Internet of Things test device is connected to the measurement and control device, the excitation is automatically input to the measurement and control device in sequence according to the remote signal point table, and after the remote master station personnel receive the remote signal, they check whether it is consistent with the point table; the switch quantity intelligent Internet of Things test device is electrically connected to the test pressure plate of the protection device, and the electrical quantity is input to the protection device in sequence according to the protection setting single tripping logic matrix sequence, and the switch quantity signal received by the test pressure plate is detected to see whether it is consistent with the tripping logic matrix; The switch quantity intelligent IoT test device includes: a switch quantity trigger module, a controller, a switch quantity measurement module, a power supply module, an intelligent interaction module and an IoT module. The switch trigger module is connected to the remote signal terminal of the measurement and control device, inputs an excitation signal, and is electrically connected to the controller; The switch quantity measurement module is electrically connected to the test pressure plate of the protection device, measures the input protection trip signal, and is electrically connected to the controller; The power supply module provides working power to the switch quantity trigger module, the switch quantity measurement module, the intelligent interaction module and the Internet of Things module; The intelligent interaction module is used for recognizing voice signals and playing voices, and is electrically connected to the controller; The controller is used to perform test operations on the switch quantity signal acquired by the switch quantity measurement module and send an excitation signal control instruction to the switch quantity trigger module; The IoT module is electrically connected to the controller to achieve communication and interconnection between the switch quantity intelligent IoT test device and the host computer or terminal.

2. A secondary switch quantity intelligent IoT test system according to claim 1, characterized in that: The switch quantity trigger module is composed of multiple groups of switch quantity trigger sub-modules, and the switch quantity trigger sub-module includes an optocoupler relay. The power output end of the optocoupler relay is connected to a jack of the integrated terminal block, and the power input end of the optocoupler relay is connected to the power module through a relay switch. The control end of the relay switch is electrically connected to the control end of the controller, and the integrated terminal block is connected one-to-one with the corresponding remote signal terminal by plugging in a wire.

3. A secondary switch quantity intelligent IoT test system according to claim 1, characterized in that: The switch quantity measurement module is composed of multiple groups of switch quantity measurement sub-modules, and the switch quantity measurement sub-module includes an optocoupler isolator QP1, a first electrical pin of the optocoupler isolator QP1 is connected to a 12V power supply through a resistor R3, a second electrical pin of the optocoupler isolator QP1 serves as a collector of a transistor Q1, and a third electrical pin of the optocoupler isolator QP1 is connected to a signal acquisition end of a controller; a fourth electrical pin of the optocoupler isolator QP1 is electrically connected to a 5V power supply through a resistor R4, an emitter of the transistor Q1 is grounded, a base of the transistor Q1 is connected to a test terminal of a measurement and control device through a resistor R1, and a resistor R2, a capacitor C1, and a diode D1 are connected in parallel between the base and the emitter of the transistor Q1 for protection and filtering.

4. A secondary switch quantity intelligent IoT test system according to claim 1, 2 or 3, characterized in that: A voice recognition unit, a voice playback unit and a relay language library are set in the intelligent interaction module. The relay language library has a wake-up function. The voice recognition unit recognizes external voice information and extracts keywords to trigger corresponding function controls. The voice playback unit feeds back function control information and obtains further confirmation. The parameter values ​​corresponding to each function can be set by voice.

5. A secondary switch quantity intelligent IoT test method, applicable to a secondary switch quantity intelligent IoT test system according to claim 1, characterized in that: The invention comprises an intelligent remote signal point-to-point method and an intelligent verification method of a protection tripping logic matrix.

6. A secondary switch quantity intelligent IoT testing method according to claim 5, characterized in that: The intelligent remote signal point-to-point method includes the following steps: S11. Confirm that the remote master station, telecontrol device and measurement and control device are communicating normally; S12, the switch quantity intelligent IoT test device determines the interface sequence of the measurement and control device according to the telesignal point table provided by the telecontrol master station; S13, the switch quantity intelligent IoT test device controls the switch quantity trigger module inside it to continuously send an excitation signal to the excitation segment of the measurement and control device according to the sequence of the remote signal point table; S14, the measurement and control device sends a response excitation message to the telecontrol device, and the telecontrol device sends a telesignaling signal to the remote master station for point verification; S15. The intelligent interactive module of the switch quantity intelligent IoT test device feeds back the name of the remote signal point and the error type by display or voice broadcast. The power personnel reset the parameters in the function control by touch setting or voice prompt, and execute S11 again.

7. A secondary switch quantity intelligent IoT testing method according to claim 6, characterized in that: In S14, the remote master station receives the telesignaling signal sent by the telecontrol device. If the telesignaling signal fails to reach the point, the switch quantity intelligent IoT test device can feedback the fault point number through the intelligent interactive module according to the name of the telesignaling signal, prompting the maintenance personnel to check and repair.

8. A secondary switch quantity intelligent IoT testing method according to claim 5, characterized in that: The protection trip logic matrix intelligent verification method includes the following steps: S21. Confirm that the wiring between the protection device and the switch quantity intelligent IoT test device is correct; S22. The communication between the switch quantity intelligent IoT test devices and between the switch quantity intelligent IoT test devices and the laptop computer is normal, and the switch quantity intelligent IoT test devices and between the switch quantity intelligent IoT test devices and the laptop computer are wirelessly connected; S23, the switch quantity intelligent IoT test device inputs the corresponding electrical quantities in sequence according to the sequence of the single tripping logic matrix set by the protection device, triggers the protection action, and measures the change of the switch quantity of the corresponding tripping outlet pressure plate at the same time, and accurately measures the action time, and compares it with the requirements of the tripping logic matrix to verify the correctness of the tripping logic matrix of the protection device.

9. A secondary switch quantity intelligent IoT testing method according to claim 8, characterized in that: In S23, the matrix logic verification of the tripping includes the tripping circuit verification and the tripping time verification of the corresponding test items. If there is a deviation in one of the items, the maintenance personnel will correct the parameter value in the function control according to the prompt and verify again.

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