Automatic electrical experiment system of power utilization information collection terminal

Abstract

The utility model provides an automatic electrical experiment system of electric information collection terminal, be applicable to electrical performance detection technical field, the system includes: host computer, electrical experiment equipment has test port, and electric information collection terminal experiment control panel. Host computer is connected with electrical experiment equipment communication through first communication link (for example RS232), is connected with experiment control panel communication through second communication link (for example ethernet). Experiment control panel electrically connects between the electrical interface of the terminal of being measured and the test port of electrical experiment equipment. Experiment control panel includes microcontroller (MCU), a plurality of relays and the isolation drive circuit between MCU and relay. The utility model solves the problem of low efficiency and poor consistency of manual testing, improves the reliability and anti-interference ability of the test system in high voltage environment through multi-stage isolation design.

Description

Technical Field

[0001] This utility model belongs to the field of electrical performance testing technology, and in particular to an automatic electrical test system for an electricity information acquisition terminal. Background Technology

[0002] Electricity consumption information collection terminals are the nerve endings of the smart grid, serving as key equipment for data collection, metering, monitoring, and electricity management. Their reliability and stability directly affect the safe operation of the power grid, the accuracy of electricity billing, and the validity of the collected data. Therefore, electricity consumption information collection terminals must undergo rigorous electrical performance testing before leaving the factory, including insulation resistance, insulation strength (withstand voltage), and impulse withstand voltage, to ensure their safety margin and reliability in complex power grid environments. Researching efficient, reliable, and automated electrical performance testing technologies and systems can guarantee the quality of smart grid equipment and improve production testing efficiency.

[0003] In existing electrical performance testing of electricity information collection terminals, the setup of the testing environment largely relies on manual operation. Test engineers typically use high-voltage cables, banana plugs, terminal blocks, and high-voltage safety switches to manually connect the interface under test (e.g., remote signaling port, RS485 port, power port) of the terminal under test to the test ports of electrical testing equipment (e.g., withstand voltage tester, impulse generator). After the test circuit (e.g., remote signaling to ground) is completed, the engineer needs to stop the equipment, manually disconnect the high-voltage connection, rewire to the next test circuit (e.g., RS485 to ground), manually reconfigure the parameters on the testing equipment, and then start the test again. Furthermore, in some semi-automated solutions, an industrial control computer or PLC may be used via an I / O card to control a switching board composed of multiple relays to achieve automatic switching of some circuits.

[0004] However, existing manual and semi-automatic testing solutions not only suffer from surface problems such as low testing efficiency and poor consistency, but also have issues with the stability of the control system under high-voltage testing environments and the electrical safety of the control unit at the level of system reliability. Utility Model Content

[0005] Purpose of the utility model: In view of the above problems of the prior art, this application provides an automatic electrical experiment system for an electricity information collection terminal.

[0006] Technical solution: First aspect, an automatic electrical testing system for an electricity information collection terminal, comprising:

[0007] Host computer;

[0008] Electrical testing equipment, with test ports for applying test stress and measuring electrical performance indicators;

[0009] The experimental control board for the power information acquisition terminal includes: a microcontroller (MCU) having at least one control output port; multiple switching elements defined as multiple relays, each relay including a relay coil and at least one pair of relay contacts; and an isolation drive circuit.

[0010] The microcontroller's control output port is electrically connected to the input of the isolated drive circuit;

[0011] The output of the isolation drive circuit is electrically connected to the relay coil of the relay;

[0012] The relay contacts are configured to be electrically connected between the test port of the electrical experimental equipment and the electrical interface of the terminal under test, forming a specific electrical experimental circuit.

[0013] Secondly, the isolation drive circuit includes:

[0014] An optocoupler has an input side and an output side;

[0015] Darlington array driver, which has logic inputs and power outputs;

[0016] The control output port of the microcontroller is electrically connected to the input side of the optocoupler;

[0017] The output side of the optocoupler is electrically connected to the logic input of the Darlington array driver;

[0018] The power output terminal of the Darlington array driver is electrically connected to the relay coil of the relay.

[0019] Thirdly, the experimental control board for the electricity information acquisition terminal further includes:

[0020] An isolated power supply unit is configured to generate a first power domain and a second power domain from an input power supply.

[0021] The microcontroller is configured to be powered by the first power domain;

[0022] The isolation drive circuit and relay coil are configured to be powered by a second power domain;

[0023] The first power domain is electrically isolated from the second power domain.

[0024] Fourthly, the isolated power supply unit includes:

[0025] The first isolated DC / DC converter has a first power output terminal and a first logic ground terminal (GND), which together constitute a first power domain.

[0026] The second isolated DC / DC converter has a second power output terminal and a second relay ground terminal (JKGND), which together constitute the second power domain.

[0027] The input terminals of both the first isolated DC / DC converter and the second isolated DC / DC converter are electrically connected to the input power supply.

[0028] The first logic ground terminal and the second relay ground terminal are electrically isolated from each other.

[0029] Fifthly, the system described in the first aspect includes:

[0030] The first communication link includes an RS232 communication line, through which the host computer and the electrical experimental equipment are connected for communication.

[0031] The second communication link includes an Ethernet communication cable, through which the host computer and the experimental control board of the power consumption information acquisition terminal communicate.

[0032] Beneficial effects: This utility model solves the problems of low efficiency and poor consistency in manual testing. Through multi-level isolation design, it improves the reliability and anti-interference ability of the testing system under high pressure environment. Attached Figure Description

[0033] Figure 1 This is a general design block diagram provided for an embodiment of this application.

[0034] Figure 2 This is a schematic diagram of a partial structure of an isolation drive circuit provided in an embodiment of this application.

[0035] Figure 3 This is a schematic diagram of a relay power supply section provided in an embodiment of this application.

[0036] Figure 4 This is a schematic diagram of a power supply circuit section provided in an embodiment of this application.

[0037] Figure 5 This is a schematic diagram of a microcontroller (MCU) circuit connection provided for an embodiment of this application.

[0038] Figure 6 This is a partial structural diagram of a PHY provided in an embodiment of this application.

[0039] Figure 7 This is a schematic diagram of a PHY hardware interface design provided for an embodiment of this application. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0041] To address the aforementioned issues, the applicant conducted in-depth searches and analyses, and discovered:

[0042] Specifically, high-pressure stress tests (such as impact and withstand voltage tests) are environments with strong electric field interference. In semi-automatic systems using simple I / O cards or PLCs, the control logic circuits (such as MCUs) and relay drive circuits often share a common ground design. When the relay coil operates, especially when high-voltage (kV level) stress is applied by electrical testing equipment, transients in dV / dt and dI / dt are generated, creating ground loop noise through ground coupling. This noise can easily interfere with the reference ground of the MCU or PLC, causing program crashes, I / O port level latching, or malfunctions, resulting in test interruptions or inaccurate results.

[0043] Furthermore, the control unit faces the risk of electrical damage. In systems lacking robust electrical isolation, if the insulation of the terminal under test is broken down during testing, or if relay contacts arc or stick together, high-voltage stress can surge back into the control side through the relay coil or a simple transistor drive circuit. Because there is only a weak electrical barrier between the MCU and the high-voltage test circuit, the high-voltage surge can instantly break down and burn out the I / O ports of the MCU or PLC, leading to catastrophic damage to the entire test fixture, production line shutdown, and repair costs.

[0044] To solve these problems, combined with Figures 1 to 5 The present invention will be specifically described through the following embodiments.

[0045] Example 1: An automatic electrical experiment system for an electricity information collection terminal is provided.

[0046] The automatic electrical experiment system of this embodiment includes, in terms of physical structure, a host computer, electrical experiment equipment, and an experiment control board for power consumption information acquisition terminal (hereinafter referred to as the experiment control board).

[0047] Accordingly, the host computer communicates with the electrical experimental equipment via the first communication link, sending parameter configuration commands to the electrical experimental equipment and receiving experimental data. In this embodiment, the first communication link is preferably an RS232 communication line.

[0048] The host computer communicates with the experimental control board of the electricity information acquisition terminal via a second communication link, and sends loop switching control commands to the control board. In this embodiment, the second communication link is preferably an Ethernet communication line.

[0049] Furthermore, electrical testing equipment (e.g., impulse voltage tester, insulation resistance tester, or withstand voltage tester) has test ports for applying high-voltage test stress or performing electrical measurements.

[0050] Based on this, the experimental control board is physically and electrically connected between the electrical interface of the terminal under test (e.g., the interface corresponding to the terminal connection) and the test port of the electrical experimental equipment (e.g., the interface corresponding to the instrument connection);

[0051] The experimental control board also includes multiple switching elements configured to respond to loop switching control commands, automatically selecting and connecting a specific electrical experimental circuit between the test port of the electrical experimental equipment and the electrical interface of the terminal under test. In this embodiment, the switching elements may be relays, such as K1, K2, K3, K4, etc.

[0052] The host computer is the control core of the entire system, used to interact with electrical experimental equipment and experimental control boards to complete the overall management of the entire system.

[0053] When performing automated testing, the operator configures the test type (e.g., insulation resistance, insulation strength, or impulse withstand voltage test) and the electrical interface circuits to be tested (e.g., remote signaling to ground, RS485 to ground, power supply to ground, etc.) on the host computer.

[0054] The host computer sends parameter configuration commands (such as configuring the amplitude of the impulse voltage) to the electrical experimental equipment via the first communication link (RS232), preparing to read the experimental data through the link after the test.

[0055] Next, the host computer sends a loop switching control command to the experimental control board via the second communication link (Ethernet).

[0056] Upon receiving the instruction, the control circuit inside the experimental control board (which will be detailed in subsequent embodiments) configures multiple switching elements (i.e., relays K1-K4, etc.) to operate in response to the instruction.

[0057] The action of the relay (e.g., closing K1) will automatically connect (or switch) a specific electrical test circuit between the test port of the electrical test equipment and a specific electrical interface of the terminal under test (e.g., connecting COMI and CLOSE1).

[0058] In summary, this system automatically switches test circuits through the experimental control board, and remotely configures experimental equipment and reads data using the host computer. This replaces manual wiring and circuit switching, solving problems such as inefficiency of manual operation, poor test consistency, difficulty in tracing test data due to manual recording, and improving the efficiency and reliability of electrical performance testing of the power information acquisition terminal.

[0059] Example 2 describes the internal circuit structure of the experimental control board for the electricity information acquisition terminal (hereinafter referred to as the experimental control board), especially the isolation drive circuit.

[0060] In a specific embodiment, the internal circuit topology of the experimental control board includes, in terms of structure, a microcontroller (MCU), multiple relays (i.e., switching elements), and an isolation drive circuit.

[0061] Accordingly, the microcontroller (MCU), in this embodiment, can be an STM32F407VGTx microcontroller (U1). Multiple general purpose input / output (GPIO) pins of this MCU are configured as control output ports, such as pins 61 (PD14), 62 (PD15), 81 (PD0), and 82 (PD1), which are used to output logic control signals YK1, YK2, YK3, and YK4, respectively.

[0062] Furthermore, this embodiment employs multiple relays, such as K1, K2, K3, and K4 (model HYB(R)V-2-1A-15-02). Each relay includes a relay coil (e.g., pins 1 and 2 of K1) and at least one pair of relay contacts (e.g., pins 3 and 4 of K1). The relay contacts (e.g., pins 3 and 4 of K1) are configured to be electrically connected between the test port of the electrical experimental equipment (e.g., COM4) and the electrical interface of the terminal under test (e.g., CLOSE4), forming a specific electrical experimental circuit.

[0063] Optionally, an isolation drive circuit is provided between the MCU (U1) and the relays (K1-K4). The connection relationship is as follows: the control output port (e.g., YK1) of the MCU (U1) is electrically connected to an input terminal of the isolation drive circuit; the output terminal of the isolation drive circuit is electrically connected to the relay coil of the relay (e.g., K1).

[0064] As an example, the isolation drive circuit in this embodiment is described, which is used to achieve high-voltage isolation and reliable switching of this invention. It adopts a specific topology that combines optocoupler isolation and Darlington drive. Structurally, the isolation drive circuit includes an optocoupler and a Darlington array driver.

[0065] The optocoupler can be an LTV816STP-D3-TXCU type optocoupler, such as D13, D17, D19, or D21.

[0066] Darlington array drivers, such as the ULQ2003AQDRQ1 type driver, such as the D14, can be used.

[0067] Taking the branch where the YK1 signal drives the relay K1 as an example, the YK1 signal output from the PD14 port of the MCU (U1) is electrically connected to the input side of the optocoupler D13 (i.e., the anode of its internal light-emitting diode, pin 1) via the current-limiting resistor R30 (RS-03K102JT). The cathode of the input side of D13 (pin 2) is electrically connected to the logic ground (GND) on the MCU side.

[0068] The collector (pin 4) of the output side of optocoupler D13 (i.e., its internal phototransistor) is electrically connected to an isolated 12V power supply (JK12V) via indicator LEDV57 (L-513HURD) and pull-up resistor R137 (RS-03K302JT). The emitter (pin 3) of D13 is electrically connected to the logic input (1B, pin 1) of Darlington array driver D14.

[0069] The power output terminal (1C, pin 16) corresponding to the logic input terminal (1B) of the Darlington array driver D14 is electrically connected to one end (pin 1) of the relay coil of relay K1.

[0070] The other end of the coil of relay K1 (pin 2) is electrically connected to the JK12V power supply. Based on this, the common ground pin (GND / VCC, pin 8) of Darlington array driver D14 is electrically connected to the isolated relay ground (JKGND).

[0071] Based on this, when the YK1 port of the MCU (U1) outputs a high level (e.g., 3.3V), current flows through the input diodes of R30 and D13, causing them to emit light. The phototransistor on the output side of D13 turns on, pulling its emitter (pin 3) high and inputting a high-level signal to the 1B port of the Darlington driver D14. The Darlington transistor inside D14 turns on, and its output terminal IC becomes low (close to JKGND).

[0072] At this time, the JK12V power supply flows to JKGND through the coil of relay K1 and the 1C port of D14, forming a conducting circuit. The coil of relay K1 is energized and its contacts (pins 3 and 4) close, connecting the electrical experimental circuit between COM4 and CLOSE4.

[0073] By using optocoupler D15, electrical isolation is achieved between the control signal (YK1, operating at GND level) of the MCU (U1) and the Darlington driver D14 (operating at JKGND level). The Darlington array driver D14 provides sufficient current amplification to drive the relay coil.

[0074] This multi-stage isolation drive topology of MCU→optocoupler→Darlington→relay ensures that when high-voltage stress (such as impulse withstand voltage) is applied to electrical experimental equipment, any electrical noise, surge, or fault generated from the relay K1 side (JK12V / JKGND power domain) is blocked by optocoupler D15, preventing it from backflowing and damaging the expensive and sensitive front-end MCU (U1). This improves the safety, reliability, and stability of the experimental control board in harsh electrical testing environments.

[0075] Example 3 provides an explanation of the internal circuit structure of the isolated power supply unit of the experimental control board for the electricity information acquisition terminal (hereinafter referred to as the experimental control board). In particular, it describes the optional configuration schemes for the power supply circuit.

[0076] In some embodiments, the experimental control board further includes an isolated power supply unit. This unit is physically configured to receive electrical energy from an input power source (e.g., VDD12 provided by an AC220 to DC12V module) to generate at least two electrically isolated power domains.

[0077] The first power domain (logic power domain) is used to provide power to the input side of the microcontroller (MCU) and the optocoupler of the isolated drive circuit. The second power domain (relay power domain) is used to provide power to the relay coils of the isolated drive circuit (such as Darlington array driver) and multiple relays (such as K1, K2, etc.).

[0078] Furthermore, the isolated power supply unit includes a first power supply circuit. This circuit is configured as a DC / DC converter, with its input electrically connected to the input power supply VDD12 and its corresponding first logic ground (GND). The output of the first power supply circuit generates a first logic power supply (e.g., VCC3V3), which, together with GND, constitutes a first power domain.

[0079] Based on this, the isolated power supply unit includes a second isolated DC / DC converter (such as a relay power supply section). This converter (D12) is preferably model F1205S-1WR2 or a DC / DC module with equivalent isolation function.

[0080] Accordingly, the input VIN and GND pins of D12 are electrically connected to the input power supply VDD12 and the first logic ground (GND), respectively. The output +V0 and 0V pins of D12 generate the second power supply output (JK12V) and the second relay ground (JKGND), respectively. The 0V pin and JKGND pin of D12 are both connected to pin 7 of D12.

[0081] Based on this, the second isolated DC / DC converter (D12) is an electrically isolated converter. Its output side second relay ground (JKGND) and its input side first logic ground (GND) are physically electrically isolated from each other, and there is no conductive path between them.

[0082] With this design, the first power domain (VCC3V3 / GND) and the second power domain (JK12V / JKGND) of this utility model have independent electrical ground references.

[0083] In some embodiments, the microcontroller (U1) operates in the first power domain (GND ground); while the Darlington driver (D14) and the relay coils (K1-K4) operate in the second power domain (JKGND ground).

[0084] Therefore, the electrical noise, large current surges, and electromagnetic interference (EMI) generated when the coils of relays K1-K4 switch or operate at high frequency are all isolated in the circuit of the second power domain (JK12V / JKGND).

[0085] Because of the electrical isolation between JKGND and GND, noise cannot be conducted through the ground wire or contaminate the GND of the first power domain, ensuring the stability and safety of the microcontroller (U1) and its control signals operating on GND. This multi-power domain isolation topology is the guarantee that this system can operate reliably under high-voltage electrical stress environments.

[0086] Example 4: A description of the specific circuit structure and connection method of the first and second communication links.

[0087] In some embodiments, the second communication link is used to connect the host computer and the experimental control board of the power consumption information acquisition terminal. In this embodiment, it can be an Ethernet communication cable. The Ethernet communication circuit structure on the experimental control board is as follows:

[0088] The main control unit of the experimental control board, namely the microcontroller (MCU) U1 (STM32F407VGTx), integrates an Ethernet media access controller (MAC).

[0089] Multiple Ethernet interface pins of MCUU1, such as PA2 (ETH_MDIO), PC1 (ETH_MDC), PA7 (ETH_CRS_DV), PC4 (ETH_RX_D0), PC5 (ETH_RX_D1), PB11 (ETH_TX_EN), PB12 (ETH_TX_D0), and PB13 (ETH_TX_D1), are brought out and electrically connected to the Ethernet PHY chip.

[0090] Furthermore, the differential signal output terminals (e.g., TX+ / TX-) and input terminals (e.g., RX+ / RX-) of the PHY chip U12 are electrically connected to the network isolation transformer T1 (CNT-5112-LED-8PSC-D). The other side of the network isolation transformer T1 is electrically connected to the RJ45 connector J1, which forms the physical interface of the Ethernet communication line.

[0091] Based on this topology, the host computer can establish a high-speed and reliable communication connection with the experimental control board via a standard Ethernet (LAN). The host computer sends loop switching control commands to the MCU (U1) of the experimental control board through this link and can receive status information from the experimental control board.

[0092] In some embodiments, the first communication link is used to connect the host computer to electrical experimental equipment (e.g., impulse voltage tester, withstand voltage tester, etc.).

[0093] The first communication link is preferably an RS232 communication line. In this embodiment, this link is an external connection: the RS232 serial port of a host computer (e.g., a PC) (or via a USB to RS232 adapter) is electrically connected to the RS232 control port of the electrical experimental equipment. The host computer sends parameter configuration commands (e.g., setting the voltage for insulation resistance testing or the amplitude of impulse withstand voltage) to the electrical experimental equipment through this RS232 communication line.

[0094] After the electrical testing equipment completes the application or measurement of test stress, the host computer reads the test data (e.g., the measured insulation resistance value) through this RS232 communication line for subsequent automatic judgment.

[0095] Furthermore, this system adopts a heterogeneous communication topology. On the one hand, Ethernet (second communication link) is used to perform high-speed, network-enabled modern control of the experimental control board designed in this invention.

[0096] On the other hand, RS232 (first communication link) is used to be compatible with and control existing, mature electrical experimental equipment that is usually only equipped with traditional serial ports.

[0097] This structural combination allows the system to seamlessly integrate the host computer, experimental control board, and high-voltage testing instruments (electrical experimental equipment) into a fully automated testing platform, realizing the overall function of the first aspect of this application.

[0098] Example 5 provides a preferred configuration for an automated electrical testing system. This system is structurally configured to flexibly adapt to various testing objectives.

[0099] Specifically, the electrical testing equipment can physically include impulse voltage testers, insulation resistance testers, and withstand voltage testers. The internal relay matrix (such as K1-K4) and circuit topology of the electrical information acquisition terminal experimental control board (hereinafter referred to as the experimental control board) are designed to withstand and switch the test stresses applied by the different instruments mentioned above. Therefore, the overall physical architecture of this system is configured to support multiple experimental types, specifically including: insulation resistance test, insulation strength test, and impulse withstand voltage test.

[0100] Furthermore, the physical interfaces of the experimental control board (such as connectors and terminal connection parts) are designed to be pluggable or adaptable to various tested terminals. The control software of the host computer stores the interface definitions and test schemes corresponding to different terminals. The structure of this system is configured to be compatible with multiple product types, specifically including: State Grid Concentrator Type I, State Grid Dedicated Transformer Data Acquisition Terminal Type III, State Grid Dedicated Transformer Data Acquisition Terminal Type II, State Grid Dedicated Transformer Data Acquisition Terminal Type I, State Grid Modular Data Acquisition Terminal Products, State Grid Smart Convergence Terminal, Southern Power Grid Load Management Terminal, Southern Power Grid Smart Measurement Terminal, and Southern Power Grid Distribution Area Terminal, etc.

[0101] Based on this, the wiring of the internal circuitry of the experimental control board (such as relays K1-K16 and their contacts) is pre-designed and fixed to form multiple specific electrical interface loops between the ports connected to the instruments and the ports connected to the terminals. The host computer can physically connect the preset loops by controlling different combinations of relays.

[0102] Depending on the type of experiment, the automatically switchable electrical test circuits are configured in the following ways: impulse voltage circuit type, including remote signaling to ground, remote signaling to power supply, remote signaling to voltage, remote signaling to current, remote signaling to control, RS485 to ground, RS485 to power supply, power supply to ground, control to ground, voltage to ground, current to ground, power supply to control, power supply to voltage, power supply to current, voltage to current, voltage to control, and current to control.

[0103] In terms of structure, the insulation test circuit type includes all the circuits mentioned above, and also includes an additional electrical circuit for testing the normally open contacts.

[0104] Through the structured configuration described above, this system transforms complex and diverse testing requirements into a relay switch matrix embedded in the experimental control board hardware and a configuration scheme stored in the host computer software. Operators do not need to change the physical wiring; they only need to select the product type and experimental circuit on the host computer interface, and the system can automatically call up and connect the corresponding physical topology, achieving a high degree of flexibility, automation, and reliability.

[0105] It should be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. An automatic electrical experiment system for an electricity information acquisition terminal, characterized in that, include: Host computer; Electrical testing equipment, with test ports for applying test stress and measuring electrical performance indicators; The experimental control board for the power information acquisition terminal includes: a microcontroller (MCU) having at least one control output port; multiple switching elements defined as multiple relays, each relay including a relay coil and at least one pair of relay contacts; and an isolation drive circuit. The microcontroller's control output port is electrically connected to the input of the isolated drive circuit; The output of the isolation drive circuit is electrically connected to the relay coil of the relay; The relay contacts are configured to be electrically connected between the test port of the electrical test equipment and the electrical interface of the terminal under test, forming a predetermined electrical test circuit.

2. The system according to claim 1, characterized in that, The isolation drive circuit includes: An optocoupler has an input side and an output side; Darlington array driver, which has logic inputs and power outputs; The control output port of the microcontroller is electrically connected to the input side of the optocoupler; The output side of the optocoupler is electrically connected to the logic input of the Darlington array driver; The power output terminal of the Darlington array driver is electrically connected to the relay coil of the relay.

3. The system according to claim 1, characterized in that, The experimental control board for the electricity information acquisition terminal further includes: An isolated power supply unit is configured to generate a first power domain and a second power domain from an input power supply. The microcontroller is configured to be powered by the first power domain; The isolation drive circuit and relay coil are configured to be powered by a second power domain; The first power domain is electrically isolated from the second power domain.

4. The system according to claim 3, characterized in that, The isolated power supply unit includes: The first isolated DC / DC converter has a first power output terminal and a first logic ground terminal (GND), which together constitute a first power domain. The second isolated DC / DC converter has a second power output terminal and a second relay ground terminal (JKGND), which together constitute the second power domain. The input terminals of both the first isolated DC / DC converter and the second isolated DC / DC converter are electrically connected to the input power supply. The first logic ground terminal and the second relay ground terminal are electrically isolated from each other.

5. The system according to claim 1, characterized in that, include: The first communication link includes an RS232 communication line, through which the host computer and the electrical experimental equipment are connected for communication. The second communication link includes an Ethernet communication cable, through which the host computer and the experimental control board of the power consumption information acquisition terminal communicate.

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