Test system for debugging distribution network automation terminal

Abstract

The utility model provides a test system for debugging a distribution network automation terminal, which comprises a master control module and a remote signaling module, and the remote signaling module comprises a remote signaling interface, a first communication circuit and a second communication circuit. The second communication circuit comprises a common-anode communication circuit, the common-anode communication circuit comprises an NMOS (N-channel Metal Oxide Semiconductor) tube, a grid electrode of the NMOS tube is connected with a remote signaling feedback pin of the remote signaling interface, a drain electrode of the NMOS tube is connected with an LED cathode of a first photoelectric coupler, an LED anode of the first photoelectric coupler is connected with an isolation power supply, and an output end of the first photoelectric coupler is connected with the main control module; the first communication circuit comprises a common cathode communication circuit which is the same as the common anode communication circuit in structure, an NMOS (N-channel Metal Oxide Semiconductor) tube is modified into a PMOS (P-channel Metal Oxide Semiconductor) tube by the common cathode communication circuit, and a grid electrode of the PMOS tube is communicated with a grid electrode of the NMOS tube. According to the utility model, the compatibility of the test system to different models of distribution network automation terminals can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of debugging distribution network automation terminals, in particular to a test system for debugging distribution network automation terminals. Background Art

[0002] The convergence of primary and secondary systems in distribution networks involves the deep integration and collaborative design of primary equipment (such as switchgear, circuit breakers, and instrument transformers) and secondary equipment (such as distribution terminals (DTUs / FTUs), protection devices, and communication modules). This enables functional integration, information sharing, and unified intelligent control between these devices, improving the reliability, automation, and operational efficiency of the distribution system. Existing technologies utilize converged primary and secondary systems for distribution networks. During operation, the distribution automation terminals receive control signals from the secondary equipment, control the operation of the primary equipment, monitor power supply data from the primary equipment, and provide feedback to the secondary equipment.

[0003] With the rapid development of distribution networks, the proportion of primary and secondary integrated automation terminals in distribution systems has increased year by year. The early commissioning and subsequent maintenance of automation terminals involve debugging, testing and other work, but traditional debugging methods have problems such as complex wiring, low efficiency and low safety.

[0004] With the advancement of technology, the development of distribution network automation terminal debugging devices has been rapid, and their types and quantity are increasing day by day. However, most of the debugging devices on the market are difficult to operate, and operators may face risks such as electric shock and falls. Utility Model Content

[0005] In view of this, the problem to be solved by the present invention is to provide a test system for debugging a distribution network automation terminal, which can improve the compatibility of the test system with distribution network automation terminal models.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A test system for debugging a distribution network automation terminal, comprising a main control module for controlling the operation of the test system and a telesignaling module for transmitting telesignaling signals and telesignaling feedback, wherein the telesignaling module comprises a telesignaling interface connected to the automation terminal, a first communication circuit for generating telesignaling signals, and a second communication circuit for receiving telesignaling feedback;

[0008] The second communication circuit includes a common anode communication circuit, the common anode communication circuit includes an NMOS tube whose gate is connected to the remote signaling feedback pin of the remote signaling interface, the drain of the NMOS tube is connected to the cathode of the LED of the first photoelectric coupler, the anode of the LED of the first photoelectric coupler is connected to the isolated power supply, and the output end of the first photoelectric coupler is connected to the main control module;

[0009] The first communication circuit includes a common cathode communication circuit having the same structure as the common anode communication circuit. The common cathode communication circuit modifies an NMOS tube into a PMOS tube, and the gate of the PMOS tube is connected to the gate of the NMOS tube.

[0010] Furthermore, the second communication circuit includes a first communication relay and a second communication relay, the first pin of the first communication relay is grounded, and the second pin is connected to the telesignaling feedback pin of the telesignaling interface, the common pin of the first communication relay is connected to the first pin of the second communication relay, the common pin of the second communication relay is connected to the telesignaling input pin, and the second pin of the second communication relay is grounded.

[0011] Furthermore, the second pin of the second communication relay is connected to the common pin of the third communication relay, the first pin of the third communication relay is grounded, and the second pin of the third communication relay is connected to the remote signaling feedback pin.

[0012] Furthermore, the main control module and the telemetry module communicate data with each other, and the telemetry module includes a telemetry interface for connecting to the automation terminal and a first transmission circuit for transmitting the measurement current;

[0013] The first transmission circuit includes a first sorting relay, a second sorting relay, and a third sorting relay, whose control end is connected to the main control module, the common pin of the first sorting relay is connected to the current source module, the first pin and the second pin of the first sorting relay are respectively connected to the common pin of the second sorting relay and the third sorting relay, and the first pin and the second pin of the second sorting relay and the third sorting relay are respectively connected to the corresponding A, B, C, and N phase input pins on the telemetry interface.

[0014] Furthermore, the telesignaling module includes a third communication circuit for receiving telemetry feedback, and the third communication circuit includes several switching relays whose control ends are connected to the main control module, the first pins of several switching relays are correspondingly connected to several measurement feedback pins of the telesignaling interface, and the second pins of several switching relays are all connected to the telesignaling feedback pins.

[0015] Furthermore, the remote signaling module includes a fourth communication circuit for receiving remote signaling feedback, the fourth communication circuit includes a trip signal circuit, the trip signal circuit includes a second photocoupler and a third photocoupler whose output end is connected to the control module, a forward voltage regulator diode is connected in series between the LED anode pin of the second photocoupler and the positive trip pin of the remote signaling interface, a forward first diode is connected in series between the LED cathode of the second photocoupler and the negative trip pin of the remote signaling interface; a reverse second diode is connected in series between the LED anode pin of the third photocoupler and the pull-up power supply, and the LED cathode pin of the third photocoupler is connected to the positive trip pin;

[0016] The fourth communication circuit includes a closing signal circuit having the same structure as the opening signal circuit, and the remote signaling interface is connected to the closing signal circuit via a closing positive pin and a closing negative pin.

[0017] Furthermore, the main control module and the wireless communication module communicate data with each other, and the wireless communication module communicates data with the wireless module of the distribution network automation terminal through a cloud server bridge.

[0018] Furthermore, the wireless communication module is 4G communication.

[0019] Furthermore, the test system includes a current source module for providing electric energy to the system. The current source module includes a power supply port connected to an external power supply. A voltage regulator is provided between the power supply port and the first transmission circuit.

[0020] Furthermore, a fuse is provided between the voltage regulator and the first transmission circuit, and the fuse is a plug-in fuse.

[0021] The advantages and positive effects of the utility model are:

[0022] By setting a common anode communication circuit and a common cathode communication circuit with the same circuit structure, the common anode communication circuit contains an NMOS tube that is turned on by a positive voltage, and the common cathode communication circuit contains a PMOS tube that is turned on by a negative voltage, and the gates of the PMOS tube and the NMOS tube are both connected to the remote signaling feedback pin of the remote signaling interface, it is possible to respectively receive two types of remote signaling feedback, common anode and common cathode, of the remote signaling common terminal YCOM of the distribution network automation terminal, thereby improving the compatibility of the test system with the distribution network automation terminal models.

[0023] By setting up a first communication circuit including a second communication relay and a third communication relay, the two communication relays are controlled to act in coordination, thereby increasing the pulse frequency of the remote signaling model and thereby improving the transmission efficiency of the remote signaling signal.

[0024] By setting up a first transmission circuit and a third communication circuit, the first transmission circuit is used to provide the distribution network automation terminal with three-phase measurement current and zero-sequence current for telemetry, and the third communication circuit is used to receive the detection results of the three-phase measurement current and zero-sequence current (telemetry feedback).

[0025] By setting up the single-phase transmission measurement current and telemetry feedback of the first transmission circuit and the third communication circuit, the output end of the third communication circuit is connected to the input end of the second communication circuit, so that the second communication circuit can be compatible with the transmission telesignaling feedback and telemetry feedback, saving the production cost of the test system.

[0026] By setting up a fourth communication circuit for receiving remote control feedback, a voltage regulator diode is provided in the fourth communication circuit. Only when the positive pin of the opening switch or the positive pin of the closing switch is higher than the regulated voltage, the corresponding second optocoupler or third optocoupler will be turned on, so that the fourth communication circuit can be compatible with receiving remote control feedback with a voltage of 0V or higher than 0V between the positive and negative pins of the opening switch, thereby improving the compatibility of the test system with distribution network automation terminal models. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a system structure diagram of a test system for debugging a distribution network automation terminal of the utility model;

[0029] Figure 2 This is a structural diagram of a first communication circuit and a second communication circuit in a test system for debugging a distribution network automation terminal of the utility model;

[0030] Figure 3 This is a circuit diagram of a voltage stabilizing chip U23 in a test system for debugging a distribution network automation terminal according to the present invention;

[0031] Figure 4 This is a structural diagram of the first transmission circuit in a test system for debugging a distribution network automation terminal of the utility model;

[0032] Figure 5 This is a structural diagram of the second communication circuit and the third communication circuit in a test system for debugging a distribution network automation terminal of the utility model;

[0033] Figure 6 This is a circuit diagram of a tripping signal in a test system for debugging a distribution network automation terminal in the utility model;

[0034] Figure 7The utility model is a circuit structure diagram of a closing signal in a test system for debugging a distribution network automation terminal. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed terms.

[0037] The utility model provides a test system for debugging distribution network automation terminals, such as Figure 1 As shown, it includes a main control module for controlling the operation of the test system and a current source module for powering the test system. The main control module is connected to the remote signal module, the telemetry module and the analog master station module respectively, and the analog master station module is connected to the touch screen module.

[0038] The telesignaling process is as follows: the telesignaling instructions are input through the touch screen module, the simulated master station module transmits them to the main control module, the main control module receives the telesignaling instructions, and transmits the generated telesignaling signals to the distribution network automation terminal through the telesignaling module. The telesignaling feedback output by the distribution network automation terminal passes through the telesignaling module, the main control module, the simulated master station module in turn, and then is displayed by the touch screen module.

[0039] The telemetry process is as follows: the telemetry command is input through the touch screen module, the simulated master station module transmits it to the main control module, the main control module receives the telemetry command, the telemetry module transmits the measured current output by the current source module to the distribution network automation terminal, the distribution network automation terminal detects the measured current and gives measurement feedback, and the measurement feedback passes through the telesignaling module, the main control module, the simulated master station module in turn and is then displayed by the touch screen module.

[0040] The remote control process is as follows: the staff sends the remote control signal to the distribution network automation terminal through the touch screen module and the simulation master station module. The remote control feedback output by the distribution network automation terminal passes through the telesignaling module, the main control module, the simulation master station module in turn, and then is displayed by the touch screen module.

[0041] The main control module communicates data with the simulated master station module. The simulated master station module uses the wireless communication module to communicate data with the wireless module of the distribution network automation terminal through the cloud server. The wireless communication module is used to obtain the control signals (telesignaling signals, remote control signals, and measured current values) received by the distribution network automation terminal for comparison with the control signals actually emitted by the test system. This ensures a one-to-one correspondence between the feedback results and the control signals, thereby improving the accuracy of the test results. In one embodiment of the present application, the wireless communication module is 4G wireless communication.

[0042] When the distribution network automation terminal receives the telesignaling signal, the device information and telesignaling signal of the distribution network automation terminal are uploaded to the cloud server. The test system accesses the cloud server through the wireless communication module and obtains the telesignaling signal. The main control module compares the telesignaling signal sent by the telesignaling module and the telesignaling signal received by the wireless communication module to determine whether the signals are consistent. If they are consistent, the telesignaling feedback is accurate. If they are inconsistent, the telesignaling feedback is abnormal and re-debugging is required.

[0043] like Figure 2 As shown, the remote signaling module includes a remote signaling interface CN1, a first communication circuit and a second communication circuit. Existing distribution network automation terminals are all equipped with a remote signaling plug that can communicate with the remote signaling interface CN1 to achieve information exchange between the test system and the distribution network automation terminal. The first communication circuit is used to generate remote signaling signals (pulse signals), and the second communication circuit is used to receive remote signaling feedback.

[0044] like Figure 2 As shown, the first communication circuit includes a first communication relay Y1 and a second communication relay K2 connected to the main control module at the control end, pin 5 of the first communication relay Y1 is grounded, pin 3 of the first communication relay Y1 is connected to pin 2 of the remote signaling interface CN1 (remote signaling input pin), pin 4 of the first communication relay Y1 is connected to pin 3 of the second communication relay K2, pin 4 of the second communication relay K2 is connected to pin 6 of the remote signaling interface CN1 (remote signaling feedback pin), and pin 5 of the second communication relay K2 is grounded.

[0045] The working process of the first communication circuit is: when no remote signal is generated, when the 5 pins of the first communication relay Y1 and the second communication relay K2 are both turned on, the 2 pin of the remote signal interface CN1 is unconnected, and the 6 pin of the remote signal interface CN1 is grounded.

[0046] When generating a telesignaling signal: When pins 3 of the first communication relay Y1 and the second communication relay K2 are both conducting, pins 6 and 2 of the telesignaling interface CN1 are connected, and a high or low level is input to pin 2 of the telesignaling interface CN1. By controlling whether pin 3 of the second communication relay K2 is conducting, a pulse signal (telesignaling signal) is input to the distribution network automation terminal. Under normal circumstances, the voltage at pin 6 of the telesignaling interface CN1 can be either greater than or less than 0V. The telesignaling common terminal YCOM is greater than 0V when sharing a common anode and less than 0V when sharing a common cathode.

[0047] To increase the pulse frequency of the telesignaling signal, a third communication relay K1 is installed within the first communication circuit, operating in conjunction with the second communication relay K2. Pin 5 of the third communication relay K1 is grounded, pin 4 of the third communication relay K1 is connected to pin 5 of the second communication relay K1, and pin 3 of the third communication relay K1 is connected to pin 2 of the telesignaling interface CN1. Due to the switching delay between the third and second communication relays K1 and K2, there is an operation delay. For example, if the switching delay of the second communication relay K2 is 0.5 seconds, the telesignaling signal pulse width generated by the second communication relay K2 alone is 1 second.

[0048] If the third communication relay K1 and the second communication relay K2 are used to work together, a pulse signal is input into pin 2 of the remote signaling interface CN1. The pulse width of the pulse signal can be 0.5s to generate a high-frequency remote signaling signal and improve communication efficiency.

[0049] The specific process is as follows: the first communication relay Y1, the second communication relay K2, and the third communication relay K1 are represented by Y1, K2, and K1, respectively. When pin 5 of Y1 is conducting, no matter how K2 and K1 operate, no remote signal is generated. When pin 3 of Y1 is conducting, pin 3 of K2 is conducting, and pin 2 of remote signal interface CN1 receives a level. When K2 switches to pin 5 conducting, K1 simultaneously switches to pin 3 conducting, and pin 2 of remote signal interface CN1 receives another level after a 0.5s interval.

[0050] like Figure 2 and Figure 3 As shown, the second communication circuit includes a common anode communication circuit, which includes an NMOS tube Q4, a resistor R38 is connected in series between the gate of the NMOS tube Q4 and the 6-pin of the remote signaling interface CN1, the source of the NMOS tube Q4 is grounded, the drain of the NMOS tube Q4 is connected to the 2-pin of the first photocoupler U21, the 1-pin of the first photocoupler U21 is connected to the 4-pin of the voltage regulator chip U23, the 2-pin of the voltage regulator chip U23 is connected to a 5V power supply, the 4-pin of the first photocoupler U21 is connected to a 3.3V power supply, and the 3-pin of the first photocoupler U21 is connected to the main control module.

[0051] When the common terminal YCOM of the remote signal is a common anode, the voltage of pin 6 of the remote signal interface CN1 is positive (the voltage is greater than 0V). When pin 6 of the remote signal interface CN1 outputs remote signal feedback, the voltage of pin 6 changes (increases) to turn on the NMOS tube Q4, and the 5V power supply stabilized by the voltage regulator chip U23 powers the input end of the first photocoupler U21. Pin 3 of the first photocoupler U21 can stably transmit the remote signal feedback to the control module.

[0052] The first communication circuit includes a common-cathode communication circuit with the same structure as the common-anode communication circuit, except that NMOS transistor Q4 is replaced with a PMOS transistor. The cathode communication circuit receives remote signaling feedback from the distribution network automation terminal's common terminal YCOM when the common terminal YCOM shares a cathode. When common terminal YCOM shares an anode, the output voltage of pin 6 of the remote signaling interface CN1 is negative (less than 0V). Negative electrical signals can only turn on the PMOS transistor.

[0053] Furthermore, separate 5V power supplies are used to power the corresponding optocouplers in both the common anode and common cathode communication circuits, ensuring stable output pulse signals. The common anode and common cathode communication circuits utilize NMOS and PMOS transistors, respectively, for conduction control. Because the conduction conditions for these transistors are opposite (one conducting at a positive voltage, the other at a negative voltage), the two circuits do not interfere with each other even when connected to pin 6 of the remote signaling interface CN1. Therefore, the remote signaling module is compatible with receiving both common anode and common cathode signal data from the remote signaling common terminal YCOM of the distribution network automation terminal, enhancing the practicality of the test system.

[0054] An embodiment of the present application is: a resistor is connected in series between pin 6 of the telesignaling interface CN1 and pin 4 of the second communication relay K2 to avoid affecting the normal transmission of telesignaling feedback, telemetry feedback and remote control feedback of the second communication circuit.

[0055] like Figure 4 As shown, the telemetry module includes a telemetry interface CN35 for connecting to an automation terminal and a first transmission circuit for transmitting the measured current. Existing distribution automation terminals are equipped with a telemetry plug that communicates with the telemetry interface CN35, allowing the distribution automation terminal to receive the three-phase current and zero-sequence current for testing. The first transmission circuit is used to transmit any one of the three-phase currents or the zero-sequence current (measured current) to the distribution automation terminal via the telemetry interface CN35. The three-phase current includes phases A, B, and C.

[0056] The first transmission circuit includes a first sorting relay K13, a second sorting relay K14, and a third sorting relay K15, whose control end is connected to the main control module. Pin 4 of the first sorting relay K13 is connected to the current source module to receive the measurement current required for telemetry. Pins 5 and 3 of the first sorting relay K13 are connected to pins 4 of the second and third sorting relays K14 and K15, respectively. Pins 3 and 5 of the second sorting relay K14 are connected to pins 4 and 3 (phase input pins) of the telemetry interface CN35, respectively. Pins 3 and 5 of the third sorting relay K15 are connected to pins 2 and 1 (phase input pins) of the telemetry interface CN35, respectively. By controlling the coordinated operation of the sorting relays K13, K14, and K15, the distribution network automation terminal is provided with a measurement current for any one of phases A, B, C, or zero-sequence current, facilitating independent verification of the distribution network automation terminal's accuracy in detecting three-phase and zero-sequence currents.

[0057] The current source module includes a power supply port for connection to an external power source. When the test system is in use, the power supply port is connected to an on-site outlet, powering the test system via a 220V external power source. In one embodiment of the present application, when there is no outlet at the construction site, the power supply port can also be connected to a portable power source to provide 220V power to the test system.

[0058] A voltage regulator is provided between the power supply port and the first transmission circuit. The voltage regulator is used to adjust the power supply voltage to provide different measurement voltages to the telemetry module, facilitating the detection accuracy of the distribution network automation terminal for different voltages.

[0059] A fuse is provided between the voltage regulator and the first transmission circuit. If a fault occurs during telemetry testing of the distribution network automation terminal, the fuse promptly disconnects the test system from the automation terminal, reducing the probability of damage to the test system. In one embodiment of the present application, the fuse is a plug-in type, allowing for quick and easy replacement without affecting subsequent telemetry debugging of the equipment.

[0060] like Figure 5 As shown, the telesignaling module includes a third communication circuit for receiving telemetry feedback. The third communication circuit includes a plurality of switch relays K3, K4, K5 and K6, whose control ends are connected to the main control module. Pin 4 of the switch relays K3, K4, K5 and K6 are respectively connected to pin 5, pin 12, pin 13 and pin 14 (measurement feedback pin) of the telesignaling interface CN1, and pin 3 of the switch relays K3, K4, K5 and K6 are all connected to pin 6 of the telesignaling interface CN1.

[0061] Pins 5, 12, 13, and 14 of the telesignaling interface CN1 are used to output telemetry feedback for phase A, phase B, phase C, and zero-sequence current, respectively. Each individual telemetry feedback output from one of these pins is fed into the second communication circuit via the corresponding switching relay, which then transmits the telemetry feedback to the main control module.

[0062] The telemetry process is as follows: the control module controls the first sorting relay K13, the second sorting relay K14 and the third sorting relay K15 to input the measured current of a certain phase into the distribution network automation terminal. After the distribution network automation terminal detects the measured current and performs the corresponding action, it outputs telemetry feedback. After the telemetry feedback is transmitted through the third communication circuit and the second communication circuit, it is input into the main control module.

[0063] like Figure 6 As shown, the remote signaling module includes a fourth communication circuit for receiving remote control feedback, and the fourth communication circuit includes a trip signal circuit. The trip signal circuit includes a second photocoupler U17 and a third photocoupler U18 whose output ends are connected to the control module. A forward voltage regulator diode D7 is connected in series between pin 1 of the second photocoupler U17 and the FZ+ pin, and a forward first diode D12 is connected in series between pin 2 of the second photocoupler and the FZ- pin; a reverse second diode D10 is connected in series between pin 1 of the third photocoupler and the pull-up 5V power supply, and pin 2 of the third photocoupler is connected to the FZ+ pin.

[0064] The second photoelectric coupler U17 and the third photoelectric coupler U18 are used to isolate the remote control feedback. The second photoelectric coupler U17 receives a high-level signal, and the third photoelectric coupler U18 receives a low-level signal. The level change signals are then connected to the main control module for processing.

[0065] The distribution network automation terminal sends a 24V (48V) pulse or level signal (remote control feedback) through the disconnecting switch positive (HZ+) and disconnecting switch negative (HZ-) terminals. Under normal conditions, the voltage at these terminals is 0V. However, some manufacturers use 12V. To ensure compatibility with remote control feedback from all distribution network automation terminals, the Zener diode D7 is model ZMM18. Zener diode D7 conducts only when the level signal on the disconnecting switch positive (HZ+) pin exceeds 18V.

[0066] like Figure 7 As shown, the fourth communication circuit includes a closing signal circuit, and the HZ+ pin and HZ- pin of the remote signal interface CN1 are connected to the closing signal circuit. The closing signal circuit has the same structure as the opening signal circuit and is compatible with distribution network automation terminals with HZ+ pin voltages of 0V and 12V.

[0067] Remote control debugging includes: the staff uses the simulated master station module to send a remote control signal, the distribution network automation terminal receives the remote control signal and performs the remote control action, and the output remote control feedback is transmitted to the main control module through the fourth communication circuit.

[0068] The above embodiments of the present invention are described in detail. However, the above contents are only preferred embodiments of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of this patent.

Claims

1. A test system for debugging a distribution network automation terminal, characterized in that: It includes a main control module for controlling the operation of the test system and a telesignaling module for transmitting telesignaling signals and telesignaling feedback. The telesignaling module includes a telesignaling interface connected to the automation terminal, a first communication circuit for generating telesignaling signals, and a second communication circuit for receiving telesignaling feedback. The second communication circuit includes a common anode communication circuit, the common anode communication circuit includes an NMOS tube whose gate is connected to the remote signaling feedback pin of the remote signaling interface, the drain of the NMOS tube is connected to the cathode of the LED of the first photoelectric coupler, the anode of the LED of the first photoelectric coupler is connected to the isolated power supply, and the output end of the first photoelectric coupler is connected to the main control module; The first communication circuit includes a common cathode communication circuit having the same structure as the common anode communication circuit. The common cathode communication circuit modifies an NMOS tube into a PMOS tube, and the gate of the PMOS tube is connected to the gate of the NMOS tube.

2. A test system for debugging a distribution network automation terminal according to claim 1, characterized in that: The first communication circuit includes a first communication relay and a second communication relay, the first pin of the first communication relay is grounded, and the second pin is connected to the telesignaling feedback pin of the telesignaling interface, the common pin of the first communication relay is connected to the first pin of the second communication relay, the common pin of the second communication relay is connected to the telesignaling input pin, and the second pin of the second communication relay is grounded.

3. A test system for debugging a distribution network automation terminal according to claim 2, characterized in that: The second pin of the second communication relay is connected to the common pin of the third communication relay, the first pin of the third communication relay is grounded, and the second pin of the third communication relay is connected to the remote signaling feedback pin.

4. A test system for debugging a distribution network automation terminal according to claim 1, characterized in that: The main control module communicates data with the telemetry module, and the telemetry module includes a telemetry interface for connecting to the automation terminal and a first transmission circuit for transmitting the measurement current; The first transmission circuit includes a first sorting relay, a second sorting relay, and a third sorting relay, whose control end is connected to the main control module, the common pin of the first sorting relay is connected to the current source module, the first pin and the second pin of the first sorting relay are respectively connected to the common pin of the second sorting relay and the third sorting relay, and the first pin and the second pin of the second sorting relay and the third sorting relay are respectively connected to the corresponding A, B, C, and N phase input pins on the telemetry interface.

5. A test system for debugging a distribution network automation terminal according to claim 4, characterized in that: The telesignaling module includes a third communication circuit for receiving telemetry feedback, and the third communication circuit includes several switching relays connected to the control end and the main control module, the first pins of several switching relays are correspondingly connected to several measurement feedback pins of the telesignaling interface, and the second pins of several switching relays are all connected to the telesignaling feedback pins.

6. A test system for debugging a distribution network automation terminal according to claim 1, characterized in that: The remote signaling module includes a fourth communication circuit for receiving remote signaling feedback, the fourth communication circuit includes a trip signal circuit, the trip signal circuit includes a second photocoupler and a third photocoupler whose output end is connected to the control module, a forward voltage regulator diode is connected in series between the LED anode pin of the second photocoupler and the positive trip pin of the remote signaling interface, a forward first diode is connected in series between the LED cathode of the second photocoupler and the negative trip pin of the remote signaling interface; a reverse second diode is connected in series between the LED anode pin of the third photocoupler and the pull-up power supply, and the LED cathode pin of the third photocoupler is connected to the positive trip pin; The fourth communication circuit includes a closing signal circuit having the same structure as the opening signal circuit, and the remote signaling interface is connected to the closing signal circuit via a closing positive pin and a closing negative pin.

7. A test system for debugging a distribution network automation terminal according to claim 1, characterized in that: The main control module communicates data with the wireless communication module, and the wireless communication module communicates data with the wireless module of the distribution network automation terminal through a cloud server bridge.

8. A test system for debugging a distribution network automation terminal according to claim 7, characterized in that: The wireless communication module is 4G communication.

9. A test system for debugging a distribution network automation terminal according to claim 1, characterized in that: The test system includes a current source module for providing electric energy to the system. The current source module includes a power supply port connected to an external power supply. A voltage regulator is provided between the power supply port and the first transmission circuit.

10. A test system for debugging a distribution network automation terminal according to claim 9, characterized in that: A fuse is provided between the voltage regulator and the first transmission circuit, and the fuse is a plug-in fuse.

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