Auxiliary tester for whole group testing of multi-channel protection devices

Abstract

The invention relates to an auxiliary tester for performing a whole group test on a multi-channel protection device. The invention designs a new access conversion circuit, designs an STM32 control platform, an interface board J1, an interface board J2, a collection module, a storage extension module, and a human-computer interaction module. The storage extension modules are connected to each other, the collection module is connected to the interface board J1 and the interface board J2, and the interface board J1 and the interface board J2 are connected to the STM32 control platform; the STM32 control platform is connected to the human-computer interaction module, and the STM32 control platform is connected to the storage extension module; the access conversion circuit ensures that each optical coupling isolation signal is arbitrarily connected to three potential signals, which are an AC 220V active potential signal, a DC 110V active potential signal or a passive empty contact. The invention can integrate and completely test the action conditions of all tripping and closing outlets at the same time during a whole group experiment.

Description

Technical Field

[0001] The invention relates to the technical field of relay protection verification of power systems, and is mainly applied to a whole set of test devices for protection devices with dual configuration and more tripping outlets. Background Art

[0002] The relay protection of important equipment in the power system (generator-transformer group, busbar, generator-transformer group, etc.) adopts dual configuration and is equipped with auxiliary devices such as local fault discrimination or non-electrical quantity. There are many tripping outlets. The inspection regulations clearly require that after completing the setting inspection of each set of individual protection, all protection devices of the same protected equipment should be connected together for a whole group test to verify whether the action relationship between the two sets of protection devices during the fault and reclosing process is correct. During on-site debugging, due to the different general action principles of each set of protection devices, the action time is inconsistent. Even for the same protection device, the action outlet changes with the fault time because the main and backup protections have multiple action sections. When the relay protection tester simulates various electrical faults for a whole group test, the usual practice is to frequently throw in and out the protection setting, trip and close the pressure plate, or modify the action time, etc., and perform repeated tests many times, which is not only inefficient but also prone to errors, and even leads to wrong conclusions. The technical problem of being able to fully test the action of all tripping and closing outlets of multiple sets of protection devices at the same time and give correct test conclusions has not yet found a truly effective solution. Summary of the invention

[0003] The purpose of the present invention is to provide an auxiliary tester for performing a whole group test on a multi-channel protection device to address the technical problem that when multiple sets of protection devices are tested as a whole group, it is impossible to fully test the action conditions of all tripping and closing outputs at the same time.

[0004] The technical solution is: an auxiliary tester for performing a whole set of tests on a multi-channel protection device, including an acquisition module, an interface board J1, an interface board J2, an STM32 control platform, a human-computer interaction module and a power supply module, a storage expansion module, and an RGB display screen;

[0005] The acquisition module is connected to the interface board J1 and the interface board J2, and the interface board J1 and the interface board J2 are connected to the STM32 control platform; the STM32 control platform is connected to the RGB display screen; the STM32 control platform is interconnected with the human-computer interaction module, and the STM32 control platform is interconnected with the storage expansion module; the power supply module is connected to the STM32 control platform;

[0006] The acquisition module is provided with three groups of switch quantity acquisition modules, each group is provided with 16 optocoupler isolation signals, namely, group A switch quantity acquisition module, group B switch quantity acquisition module, and group E switch quantity acquisition module. The group A switch quantity acquisition module is arranged at the top of the tester, including A1 optocoupler isolation signal ~ A16 optocoupler isolation signal, the group B switch quantity acquisition module is arranged at the top of the tester, including B1 optocoupler isolation signal ~ B16 optocoupler isolation signal, the group E switch quantity acquisition module is arranged at the back of the tester, including E1 optocoupler isolation signal ~ E16 optocoupler isolation signal, each optocoupler isolation signal can collect any tripping exit signal of the same set of protection devices in the whole group of tests, 48 ​​optocoupler isolation signals are sampled synchronously, and the resolution can reach 1ms;

[0007] Each group of 48 optocoupler isolation signals is also equipped with an access conversion circuit to ensure that each optocoupler isolation signal can be connected to any of three potential signals, namely, AC 220V active potential signal, DC 110V active potential signal or passive empty contact;

[0008] The human-computer interaction module includes a switch button, 7 manual operation keys, 6 positioning keys, and an automatic start reserved interface and an automatic stop reserved interface;

[0009] The power supply module supplies power to the STM32 control platform, the acquisition module and the peripheral I / O interface.

[0010] The input range of the AC 220V active potential signal is AC 100V~250V; the input range of the DC 110V active potential signal is DC 85V~115V, and the DC voltage signal within the range can be directly collected; the passive empty contact can be directly connected to the optical isolation signal.

[0011] The access conversion circuit is that the AC LN is connected to the resistor R1, rectified by the single-phase rectifier bridge composed of D1, D2, D3, and D4 diodes, connected to the optocoupler OP2 through the voltage-stabilizing diode D5 and the voltage-limiting capacitor C1, and the NPN contact is connected to the transistor S8050 through the resistors R3 and R2, and after the empty contact FG~1 is connected in parallel, it is connected between the resistors R7 and R8 as one of the I / O input signals of the STM32 control platform;

[0012] The DC voltage IN passes through resistors R5 and R6, voltage-stabilizing diode D9, voltage-limiting diode D10, optocoupler OP1, and is connected between resistors R7 and R8 as one of the I / O input signals of the STM32 control platform.

[0013] The access conversion circuit converts different types of optocoupler isolation signals into NPN transistor switch quantity signals or open contact signals, and then connects them to one of the I / O detection ports of the STM32 control platform with two resistors in series to achieve fast and simultaneous identification.

[0014] The storage expansion module uses a large-capacity TF card as a FLASH expansion chip to store the absolute time of the switch change and the automatically generated control word event information.

[0015] The power supply module converts the AC 220V power supply into DC 5V after rectification and filtering through the integrated voltage regulator LM7805, converts it into 3.3V through the voltage regulator chip, and connects it to the output end of the 3.3V button battery to power the STM32 control platform, acquisition module and peripheral I / O interface.

[0016] In the human-computer interaction module, 7 manual operation keys are arranged below the RGB display screen, namely start, pause, stop, page up, page down, return, and confirm; 6 positioning keys are arranged on the right side of the RGB display screen, namely cursor 1 left, cursor 1 right, cursor 2 left, cursor 2 right, cursor 3 left, and cursor 3 right; the automatic start reserved interface and the automatic stop reserved interface can each output a pair of nodes for controlling the start and stop of the auxiliary tester at the beginning and end of the tester simulation fault, which can ensure the absolute time uniformity of the three groups of acquisition modules.

[0017] The export of the storage expansion module record file can save at least 100 action records, each action record can be recorded for up to 1 minute, can be automatically saved and cyclically overwritten, and automatically generate a tripping outlet action report for each group.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention can completely test the action conditions of all tripping and closing outputs of multiple sets of protection devices at the same time and give correct test conclusions, which solves the technical difficulty that it is impossible to repeatedly simulate the change of fault state during the whole group test due to different action principles and inconsistent action times of multiple sets of protection devices or when the main and backup protections of the same protection device have multiple action sections, thereby greatly improving the effectiveness and verification efficiency of the whole group of protection test data.

[0020] 2. The present invention can automatically convert all action statuses of action outlets recorded in the entire tripping process of each set of protection devices into hexadecimal tripping control words according to the time sequence, so as to facilitate intuitive comparison with the setting value to draw a correct conclusion.

[0021] 3. The present invention can perform offline analysis on the action behaviors of multiple protection devices under the same fault condition, comprehensively evaluate the time difference of the tripping outputs of each protection device, and comprehensively reflect its protection performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the present invention.

[0023] Figure 2 It is a top view of the present invention.

[0024] Figure 3 It is a rear view of the present invention.

[0025] Figure 4 This is the access conversion circuit diagram of the present invention.

[0026] Figure 5 It is a wiring diagram of the STM32 control platform of the present invention.

[0027] Figure 6 It is the wiring diagram of interface board J1 of the present invention.

[0028] Figure 7 This is the wiring diagram of the interface board J2 of the present invention.

[0029] Figure 8 It is a power supply circuit diagram of the present invention.

[0030] Fig. 9 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings.

[0032] 1. Overall structure

[0033] The present invention provides an auxiliary tester for performing a whole group test on a multi-channel protection device, and its structure is divided into four parts:

[0034] like Figure 1-3 As shown, the first part is the acquisition module, which includes Group A switch quantity acquisition module, Group B switch quantity acquisition module, and Group E switch quantity acquisition module. The Group A switch quantity acquisition module is located on the top of the tester, including A1 optocoupler isolation signal ~ A16 optocoupler isolation signal, the Group B switch quantity acquisition module is located on the top of the tester, including B1 optocoupler isolation signal ~ B16 optocoupler isolation signal, and the Group E switch quantity acquisition module is located on the back of the tester, including E1 optocoupler isolation signal ~ E16 optocoupler isolation signal. Any one of them can be directly connected to the AC 220V active potential signal, the DC 110V active potential signal or the passive empty contact through the access conversion circuit. Figure 4 As shown, different types of optocoupler isolation signals are converted into NPN transistor switch signals or open contact signals, and then connected to one of the I / O detection ports of the STM32 with two resistors in series limit, so that fast and simultaneous identification can be achieved.

[0035] The second part is the STM32 control platform. Figure 5-7 , Fig. 9As shown, the acquisition module is connected to the interface board J1 and the interface board J2, and the interface board J1 and the interface board J2 are connected to the STM32 control platform and the STM32 control platform is connected to the RGB display screen; the STM32 control platform is interconnected with the human-computer interaction module, and the STM32 control platform is interconnected with the storage expansion module.

[0036] The wiring of interface board J1 and interface board J2 is as follows Figure 6-7 shown.

[0037] The first route of group A is called A1, which is connected to PC13 of J1-28; the second route of group A is called A2, which is connected to PB9 of J1-27; ... the 16th route of group A is called A16, which is connected to PF7 of J1-13;

[0038] Similarly, the first route of group B, called B1, is connected to PG14 of J1-32; the second route of group B, called B2, is connected to PG13 of J1-33; ... the 16th route of group B, called B16, is connected to PA6 of J1-47;

[0039] The first route of group E is called E1, which is connected to PH13 of J2-30; the second route of group E is called E2, which is connected to PH14 of J2-29; ... the 16th route of group E is called E16, which is connected to PG6 of J2-15.

[0040] like Figure 1 , Figure 3 As shown, the third part is the human-computer interaction module, which consists of 7 manual operation keys: start, pause, stop, page up, page down, return, and confirm; 6 positioning keys: cursor 1 left, cursor 1 right, cursor 2 left, cursor 2 right, cursor 3 left, cursor 3 right; and 2 reserved interfaces: automatic start and automatic stop.

[0041] The fourth part is the power supply module, such as Figure 8 As shown in the figure, the AC 220V power supply is rectified and filtered, and then converted into DC 5V by the integrated voltage regulator LM7805. After being converted into 3.3V by the voltage regulator chip, it supplies power to the STM32 control platform, acquisition module and peripheral I / O interface.

[0042] 2. Functional description of each module

[0043] The first part is the acquisition module. The device is set up with 3 groups, each with 16 optocoupler isolation signals. Each signal can collect any tripping exit signal of the same set of protection devices in the whole group of tests. The 48 optocoupler isolation signals are sampled synchronously with a resolution of up to 1ms. Due to the limitations of on-site test conditions, there may be active signals that cannot be completely isolated. Access conversion circuits for three different types of input quantities are specially designed to ensure that not only passive empty contacts can be efficiently accessed, but also DC 110V active potential signals and AC 220V active potential signals can be safely accessed. Special interface terminals are provided to obtain different tripping signals according to actual needs on site to achieve compatibility.

[0044] The following is a description of the access conversion circuits for three different types of input quantities:

[0045] Among them, the AC 220V active potential signal has an input range of AC 100V-250V, which can directly collect the AC voltage signal within the range, and convert it into a DC voltage signal after isolation and voltage reduction by a single-phase rectifier bridge, and then convert it into a signal recognizable by the optical isolation after passing through a voltage-stabilizing diode, a voltage-limiting capacitor, and a current-limiting resistor; the DC 110V active potential signal has an input range of DC 85V-115V, which can directly collect the DC voltage signal within the range, and convert it into a signal recognizable by the optical isolation after voltage division by a current-limiting resistor; the empty contact can directly connect to the optical isolation signal.

[0046] like Figure 4 As shown, the AC LN is connected to the resistor R1, and after being rectified by the single-phase rectifier bridge composed of diodes D1, D2, D3, and D4, it is connected to the optocoupler OP2 through the voltage-stabilizing diode and the voltage-limiting capacitor C1. The NPN contact is connected to the transistor S8050 through resistors R3 and R2, and after being connected in parallel to the open contact FG-1, it is connected between resistors R7 and R8 as one of the I / O input signals of the STM32 control platform.

[0047] Similarly, the DC voltage IN passes through resistors R5 and R6, the voltage-stabilizing diode D9, the voltage-limiting diode D10, the optocoupler OP1, and is connected between resistors R7 and R8 as one of the I / O input signals of the STM32 control platform.

[0048] The second part is the STM32 control platform, including an internal logic operation CPU module, a real-time clock module, an externally connected interface board J1, a structure board J2, an extended storage module, and a matching RGB display screen. The extended storage module also uses a large-capacity TF card as a FLASH expansion chip to store the absolute time of switch changes, automatically generated control words and other event information.

[0049] The software functions are described as follows:

[0050] The STM32 control platform system can ensure that the high / low level status of all 16 I / O ports of the same group (all protection devices A can be connected during field tests) is detected within 1ms. The high level is 0 and the low level is 1. The absolute time of the change is recorded in real time, and different colors (0 is black, 1 is blue) are used to record and display them on the screen, so that the tripping exit information can be seen intuitively. The other two groups are similar (protection devices B and C can be connected during field tests), so that one action can record the action status of the tripping exits of all related protection devices at the same time.

[0051] Because the control word of the protection device tripping output is composed of 4 groups of binary weighted hexadecimal numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F), when checking the action status of the tripping output, you can view it in groups. For example, when the cursor is positioned at a certain moment, at this time, the 1st channel of the first group is 0, the 2nd channel is 1, the 3rd channel is 1, and the 4th channel is 1, then the binary is considered to be 0111, corresponding to the hexadecimal 7; the 5th channel of the first group is 1, the 6th channel is 1, the 7th channel is 1, and the 8th channel is 1, then the binary is considered to be 1111, corresponding to the hexadecimal F; the 9th channel of the first group is 0, the 10th channel is 0, the 11th channel is 0, and the 12th channel is 0, then the binary is considered to be 0000, corresponding to the hexadecimal 0; the 13th channel of the first group is 1, the 14th channel is 0, the 15th channel is 0, and the 16th channel is 0, then the binary is considered to be 1000, corresponding to the hexadecimal 8; then the trip control word composed of the first group of 16 channels is 7F08; then the cursor will automatically display the trip control as 7F08 next to it, which is convenient for comparison with the set trip control word, and the same applies to the other two groups.

[0052] The automatic start and stop interface of the equipment can output a pair of nodes to control the start and stop of the auxiliary tester at the beginning and end of the tester's fault simulation, ensuring the absolute time unity of the three groups of acquisition modules.

[0053] In the software interface, three baselines are set: cursor 1 (yellow), cursor 2 (green), and cursor 3 (red). Cursor 1 corresponds to group A, cursor 2 corresponds to group B, and cursor 3 corresponds to group C. When each group of cursors is positioned at a certain moment, the information of this group can be displayed in real time in the remarks column:

[0054] The corresponding absolute time and the trip control word corresponding to this group of 16 switch quantities, such as 2021.02.11, 00:01:02:783ms, Group A: 193B.

[0055] 2) The time difference between cursor 1 (yellow), cursor 2 (green) and cursor 3 (red) is △T12=ms, △T13=ms, △T23=ms. If the error of △T12, △T13, △T23 is not within the set time difference range (10ms), the background color will be displayed in high brightness to indicate the abnormality.

[0056] A large-capacity external TF storage device is set up with an output interface reserved to facilitate the export of record files. It can save at least 100 action records, and each action record can be recorded for up to 1 minute. It can be automatically saved and cyclically overwritten, and automatically generate a tripping export action report for each group, such as:

[0057] Trip output action report 1:

[0058] Group A: (01) 2021.02.11, 00:01:00:001ms,:0000;

[0059] Group A: (02) 2021.02.11, 00:01:02:185ms,:151AB; . .

[0060] Group A: (18) 2021.02.11, 00:01:59:760ms,:191B;

[0061] Group A: (19) 2021.02.11, 00:02:00:783ms,:193B; . .

[0062] The display format of Group B and Group C is the same as Group A, where serial number (01) is the absolute time and trip control word when automatically or manually started. When the STM32 control platform system calculates the trip control word of each group at each moment in real time, if it is the same as the trip control word of serial number (01), it will not be recorded. If it is different from the trip control word of serial number (01), it will be recorded as serial number (02), and the absolute time of the switch change and the corresponding trip control word will be recorded; then the trip control word of each moment is calculated in real time. If it is the same as the trip control word recorded with serial number (02), it will not be recorded. If it is different from the trip control word with serial number (02), it will be recorded as serial number (03), and the absolute change time and the corresponding trip control word will be recorded..., and so on, until the recording process ends or the 1-minute recording cycle ends, the calculation results of this start are automatically recorded and saved in the memory in the above format, and will not be lost when the power is off. To verify whether the entire group of test logic is correct, it provides data support and facilitates quick judgment. It can also be used as a small switch fault recorder, with external inputs for automatic start and automatic stop, which can be expanded and has great practical value.

[0063] The third part is the human-computer interaction module. The switch button is used to connect the AC 220V power supply; the six operation keys such as start, pause, stop, page up, page down, and return are used to record the process during the entire test, and the six positioning keys such as cursor 1 left, cursor 1 right, cursor 2 left, cursor 2 right, cursor 3 left, and cursor 3 right, as well as two reserved interfaces for automatic start and automatic stop, the three baselines of cursor 1 (yellow), cursor 2 (green), and cursor 3 (red) can be moved in real time to display the corresponding trip control words, which can be used to compare the similarities and differences of the trip control words at different times, realize automatic monitoring of the entire process, and realize the synchronous recording of backup protection action information.

[0064] The fourth part is the power supply module. The AC 220V power supply LN is isolated by the isolation transformer, and then connected to the integrated voltage regulator LM7805 through the rectifier filter circuit. The voltage regulator chip converts 5V into 3.3V, and then connects it to the output end of the 3.3V button battery to power the STM32 control platform, acquisition module and peripheral I / O interface.

[0065] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. An auxiliary tester for performing a whole set of tests on a multi-channel protection device, characterized in that: Including acquisition module, interface board J1, interface board J2, STM32 control platform, human-computer interaction module and power supply module, storage expansion module, RGB display screen; The acquisition module is connected to the interface board J1 and the interface board J2, and the interface board J1 and the interface board J2 are connected to the STM32 control platform; the STM32 control platform is connected to the RGB display screen; the STM32 control platform is interconnected with the human-computer interaction module, and the STM32 control platform is interconnected with the storage expansion module; the power supply module is connected to the STM32 control platform; The acquisition module is provided with three groups of switch quantity acquisition modules, each group is provided with 16 optocoupler isolation signals, namely, group A switch quantity acquisition module, group B switch quantity acquisition module, and group E switch quantity acquisition module. The group A switch quantity acquisition module is arranged at the top of the tester, including A1 optocoupler isolation signal ~ A16 optocoupler isolation signal, the group B switch quantity acquisition module is arranged at the top of the tester, including B1 optocoupler isolation signal ~ B16 optocoupler isolation signal, the group E switch quantity acquisition module is arranged at the back of the tester, including E1 optocoupler isolation signal ~ E16 optocoupler isolation signal, each optocoupler isolation signal can collect any tripping exit signal of the same set of protection devices in the whole group of tests, 48 ​​optocoupler isolation signals are sampled synchronously, and the resolution can reach 1ms; Each group of 48 optocoupler isolation signals is also equipped with an access conversion circuit to ensure that each optocoupler isolation signal can be connected to any of three potential signals, namely, AC 220V active potential signal, DC 110V active potential signal or passive empty contact; The human-computer interaction module includes a switch button, 7 manual operation keys, 6 positioning keys, and an automatic start reserved interface and an automatic stop reserved interface; The power supply module supplies power to the STM32 control platform, the acquisition module and the peripheral I / O interface.

2. The auxiliary tester for performing a whole group test on a multi-channel protection device as claimed in claim 1, characterized in that: The input range of the AC 220V active potential signal is AC 100V~250V; the input range of the DC 110V active potential signal is DC 85V~115V, and the DC voltage signal within the range can be directly collected; the passive empty contact can be directly connected to the optical isolation signal.

3. The auxiliary tester for performing a whole group test on a multi-channel protection device as claimed in claim 1, characterized in that: The access conversion circuit is an AC LN connected to a single-phase rectifier bridge composed of diodes D1, D2, D3, and D4 through a resistor R1. The output end of the single-phase rectifier bridge is respectively connected in parallel with a voltage-stabilizing diode D5 and a voltage-limiting capacitor C1. One end of the voltage-limiting capacitor C1 is connected to the positive electrode of the diode D6, and the cathode of the diode D6 is connected to the positive electrode of the diode on the input side of the optocoupler OP2. The other end of the voltage-limiting capacitor C1 is connected to the negative electrode of the diode on the input side of the optocoupler OP2. The collector of the transistor on the output side of the optocoupler OP2 is connected to VCC. The emitter of the transistor on the output side of the optocoupler OP2 is respectively connected to one end of the resistor R3 and one end of the resistor R2. The other end of the resistor R3 is connected to the base of the transistor S8050, and the other end of the resistor R2 is connected to the emitter of the transistor S8050. VCC is connected to the collector of the transistor S8050 through a resistor R4 and a diode D8. The idle contact FG~1 is connected in parallel between the collector and the emitter of the transistor S8050. VCC is also connected to the resistor R 7, the other end of resistor R7 is connected to one end of resistor R8, the other end of resistor R8 is grounded, the collector of transistor S8050 is connected to one end of resistor R8, and the emitter of transistor S8050 is connected to the other end of resistor R8, as one of the I / O input signals of the STM32 control platform; the positive end of DC voltage IN is connected to one end of resistor R5, the negative end of DC voltage IN is connected to one end of resistor R6, the other end of resistor R5 is connected to the cathode of diode D9, the anode of diode D9 is respectively connected to the cathode of diode D10 and the positive electrode of the diode on the input side of optocoupler OP1, the resistor R6 is respectively connected to the anode of diode D10 and the negative electrode of the diode on the input side of optocoupler OP1, the collector of the transistor on the output side of optocoupler OP1 is connected to one end of resistor R8, and the emitter of the transistor on the output side of optocoupler OP1 is connected to the other end of resistor R8, as one of the I / O input signals of the STM32 control platform.

4. The auxiliary tester for performing a whole group test on a multi-channel protection device as claimed in claim 1 or 3, characterized in that: The access conversion circuit converts different types of optocoupler isolation signals into NPN transistor switch quantity signals or open contact signals, and then connects them to one of the I / O detection ports of the STM32 control platform with two resistors in series to achieve fast and simultaneous identification.

5. The auxiliary tester for performing a whole group test on a multi-channel protection device as claimed in claim 1, characterized in that: The storage expansion module uses a large-capacity TF card as a FLASH expansion chip to store the absolute time of the switch change and the automatically generated control word event information.

6. The auxiliary tester for performing a whole group test on a multi-channel protection device as claimed in claim 1, characterized in that: The power supply module converts the AC 220V power supply into DC 5V after rectification and filtering through the integrated voltage regulator LM7805, converts it into 3.3V through the voltage regulator chip, and connects it to the output end of the 3.3V button battery to power the STM32 control platform, acquisition module and peripheral I / O interface.

7. The auxiliary tester for performing a whole group test on a multi-channel protection device as claimed in claim 1, characterized in that: In the human-computer interaction module, 7 manual operation keys are arranged below the RGB display screen, namely start, pause, stop, page up, page down, return, and confirm; 6 positioning keys are arranged on the right side of the RGB display screen, namely cursor 1 left, cursor 1 right, cursor 2 left, cursor 2 right, cursor 3 left, and cursor 3 right; the automatic start reserved interface and the automatic stop reserved interface can each output a pair of nodes for controlling the start and stop of the auxiliary tester at the beginning and end of the tester simulation fault, which can ensure the absolute time uniformity of the three groups of acquisition modules.

8. The auxiliary tester for performing a whole group test on a multi-channel protection device as claimed in claim 5, characterized in that: The export of the storage expansion module record file can save at least 100 action records, each action record can be recorded for up to 1 minute, can be automatically saved and cyclically overwritten, and automatically generate a tripping outlet action report for each group.

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