Electronic transformer immunity test system under multi-physics field coupling effect

Abstract

The invention discloses a system for testing the immunity of an electronic transformer under the coupling action of multiple physical fields. The system comprises an electromagnetic disturbance module, a first coupling and decoupling network, a second coupling and decoupling network, a third coupling and decoupling network, a temperature and humidity adjusting module and an online monitoring system, the electromagnetic disturbance module comprises an electrical fast transient pulse train generator, a surge generator and a radio frequency induction conduction disturbance generator; the temperature and humidity adjusting module adjusts the temperature and humidity of the environment where the tested device is located according to an instruction of the on-line monitoring system. The on-line monitoring system comprises a voltage sensor, a current sensor and an upper computer, and is used for monitoring a protection current error, a measurement error current, a voltage amplitude error and a voltage phase error in a voltage applying process, and judging whether the phenomena of damage, communication interruption, packet loss, quality output change and output waveform distortion of the detected equipment occur or not. According to the invention, the reliability verification of the electronic transformer can be realized, and the detection capability of the electronic transformer is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic mutual inductor anti-interference testing, and in particular to an electronic mutual inductor anti-interference testing system under multi-physical field coupling. Background Art

[0002] Electronic transformers are key equipment for the intelligentization, digitization and informatization of power grids. Their safe and stable operation is of great significance to the construction of digital power grids and the building of new power systems.

[0003] At present, both the IEC standard and the national standard require that the test requirements for each part of the electronic transformer be to test the electromagnetic compatibility and environmental reliability separately, but do not assess the impact of other possible factors. It is precisely because the existing assessment standards do not adequately simulate the actual situation of the electronic transformer in the substation that the reliability of the electronic transformer that has been put into operation is not high, which seriously affects the promotion and application of this advanced technology in the power system. In order to improve the reliability of the electronic transformer, it is necessary to consider the temperature, humidity and other environmental factors to re-conduct the electronic transformer immunity test under the action of multiple interference sources. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides an electronic transformer anti-interference test system under the coupling of multiple physical fields. By studying the reliability inspection strategy under the simultaneous action of multiple physical fields, the reliability verification of the electronic transformer is realized, the detection capability of the electronic transformer is improved, and the network access quality of the product is improved.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an electronic transformer immunity test system under multi-physical field coupling, comprising:

[0007] It includes an electromagnetic disturbance module, a first coupling and decoupling network, a second coupling and decoupling network, a third coupling and decoupling network, a temperature and humidity adjustment module and an online monitoring system;

[0008] The electromagnetic disturbance module is placed outside the temperature and humidity adjustment module, and includes an electrical fast transient pulse group generator, a surge generator, and a radio frequency induction conduction disturbance generator;

[0009] The electrical fast transient pulse group generator is connected to the first coupling decoupling network through a coaxial cable, and the generated electrical fast transient pulse group disturbance voltage is output to the coupling decoupling network through the coaxial cable, and is directly coupled to the working power supply of the device under test through the coupling decoupling network; the surge generator is connected to the second coupling decoupling network through a coaxial cable, and the generated surge pulse is output to the coupling decoupling network through the coaxial cable, and is directly coupled to the working power supply of the device under test through the coupling decoupling network; the radio frequency inductive conducted disturbance generator is connected to the third coupling decoupling network through a coaxial cable, and the generated conducted disturbance voltage is output to the coupling decoupling network through the coaxial cable, and is directly coupled to the working power supply of the device under test through the coupling decoupling network;

[0010] The first coupling-decoupling network, the second coupling-decoupling network, the third coupling-decoupling network and the device under test are placed in the temperature and humidity adjustment module, and the device under test is placed on an insulating support;

[0011] The temperature and humidity adjustment module adjusts the temperature and humidity of the environment in which the device under test is located according to the instructions of the online monitoring system;

[0012] The online monitoring system includes a voltage sensor, a current sensor and a host computer, which are used to monitor the protection current error, measurement error current, voltage amplitude error and voltage phase error during the voltage application process, and determine whether the device under test is damaged, communication is interrupted, packet is lost, quality output is changed and output waveform is distorted.

[0013] As a preferred solution of the electronic transformer immunity test system under multi-physical field coupling of the present invention, the electrical fast transient pulse group generator includes a high-voltage power supply U, an energy storage capacitor C c , switch Switch, pulse duration adjustment resistor R S , impedance matching resistor R m and the DC blocking capacitor C d ; High voltage power supply U continuously supplies energy storage capacitor C c When the voltage reaches the preset value, the switch is closed to charge the energy storage capacitor C c The voltage across the two ends is released, and the resistance R is adjusted during the pulse duration. S A fast transient pulse signal is formed on the m and the DC blocking capacitor C d The signal is output to the coupling-decoupling network through a 50Ω coaxial cable, and the electrical fast transient pulse group disturbance voltage is directly coupled to the working power supply of the device under test through the coupling-decoupling network.

[0014] As a preferred solution of the electronic transformer immunity test system under the multi-physical field coupling action described in the present invention, wherein: the first coupling-decoupling network includes a decoupling part and a coupling part; the decoupling part includes a plurality of groups of decoupling units in parallel, each group of decoupling units includes a filter capacitor, a decoupling resistor and a ferrite connected in sequence, and the coupling part includes a plurality of coupling capacitors in parallel; the plurality of groups of decoupling units and the plurality of coupling capacitors are connected one-to-one to three phase lines, a neutral line or a protective ground.

[0015] As a preferred solution of the electronic transformer immunity test system under multi-physical field coupling described in the present invention, wherein: the first coupling-decoupling network adopts a capacitive coupling clamp or CDN.

[0016] As a preferred solution of the electronic transformer immunity test system under multi-physical field coupling described in the present invention, the surge generator includes two types of combination wave generators; for the port connected to the outdoor symmetrical communication line, a 10 / 700us combination wave generator is used; for other situations, a 1.2 / 50us combination wave generator is used.

[0017] As a preferred solution of the electronic mutual inductor immunity test system under multi-physical field coupling described in the present invention, wherein: the 1.2 / 50us combination wave generator includes a high voltage source, a charging resistor, an energy storage capacitor, a first pulse duration adjustment resistor, a second pulse duration adjustment resistor, an impedance matching resistor and an inductor;

[0018] The high voltage source, charging resistor, switch, impedance matching resistor, inductor and second pulse duration adjusting resistor are connected in sequence; one end of the energy storage capacitor is connected to the connection point of the charging resistor and the switch, and the other end is connected to the end of the high voltage source away from the charging resistor; one section of the first pulse duration adjusting resistor is connected to the connection point of the switch and the impedance matching resistor, and the other end is connected to the end of the high voltage source away from the charging resistor;

[0019] For AC or DC power lines, the coupling elements of the second coupling-decoupling network use high-voltage capacitors; for I / O lines and communication lines, the coupling elements of the second coupling-decoupling network use capacitors, clamping devices and lightning arresters.

[0020] As a preferred solution of the electronic transformer immunity test system under the multi-physical field coupling described in the present invention, wherein: the surge generator is directly connected to the metal casing of the device under test, and the terminal of the tested port is grounded; all ports connected to the device under test are isolated from the ground through a safety isolation transformer or a second coupling and decoupling network; the cable length between the tested port and the device at the other end of the cable connected to the port is greater than 10m, and a twisted pair winding method is adopted.

[0021] As a preferred solution of the electronic mutual inductor immunity test system under multi-physical field coupling described in the present invention, wherein: the radio frequency induction conducted disturbance generator includes a radio frequency signal source, a variable attenuator, a radio frequency switch, a broadband power amplifier, a filter and a fixed attenuator connected in sequence;

[0022] The third coupling-decoupling network, the device under test, the decoupling device and the auxiliary device are connected in sequence, and the device under test and the auxiliary device are both installed on an insulating support; the output end of the radio frequency inductive conducted interference generator is connected to the test port where the device under test is connected to the decoupling device.

[0023] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, steps of an electronic transformer immunity test system under multi-physical field coupling are implemented.

[0024] A computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of an electronic transformer immunity test system under multi-physical field coupling.

[0025] Beneficial effects of the present invention: The electronic transformer anti-interference test system under the multi-physical field coupling action of the present invention realizes the reliability verification of the electronic transformer, improves the electronic transformer detection capability, and improves the network access quality of the product by studying the reliability inspection strategy under the simultaneous action of multiple physical fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 A block diagram of an electronic transformer immunity testing system under multi-physical field coupling provided by an embodiment of the present invention.

[0028] Figure 2 A schematic diagram of an electrical fast transient pulse group generator of an electronic transformer immunity test system under multi-physical field coupling provided by an embodiment of the present invention.

[0029] Figure 3 A three-phase EFT / B CDN block diagram of an electronic transformer immunity test system under multi-physical field coupling provided by an embodiment of the present invention.

[0030] Figure 4A single-phase EFT / B CDN block diagram of an electronic transformer immunity test system under multi-physical field coupling provided by an embodiment of the present invention.

[0031] Figure 5 A schematic diagram of a fast power line test circuit of an electronic transformer immunity test system under multi-physical field coupling provided by an embodiment of the present invention.

[0032] Figure 6 A schematic diagram of a fast signal line test circuit of an electronic transformer immunity test system under multi-physical field coupling provided by an embodiment of the present invention.

[0033] Figure 7 A schematic diagram of a surge generator of an electronic transformer immunity test system under multi-physical field coupling provided by an embodiment of the present invention.

[0034] Figure 8 A schematic diagram of a surge experiment configuration for shielded cables in an electronic transformer immunity test system under multi-physical field coupling provided by an embodiment of the present invention.

[0035] Fig. 9 A schematic diagram of a radio frequency induced conducted disturbance generator of an electronic transformer immunity test system under multi-physical field coupling provided by an embodiment of the present invention.

[0036] Fig.10 A schematic diagram of direct injection into a frequency-closed cable of an electronic transformer immunity test system under multi-physical field coupling provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0041] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Example 1, reference Figure 1-Figure 10 , which is the first embodiment of the present invention, provides an electronic transformer immunity test system under multi-physical field coupling, including:

[0044] The present invention discloses an electronic mutual inductor anti-interference test system under multi-physical field coupling, the electronic mutual inductor anti-interference test system comprises an electromagnetic disturbance module, a first coupling-decoupling network, a second coupling-decoupling network, a third coupling-decoupling network, a temperature and humidity adjustment module and an online monitoring system;

[0045] The electromagnetic disturbance module is placed outside the temperature and humidity adjustment module, and includes an electrical fast transient pulse group generator, a surge generator, and a radio frequency induction conduction disturbance generator;

[0046] The electrical fast transient pulse group generator is connected to the first coupling decoupling network through a coaxial cable, and the generated electrical fast transient pulse group disturbance voltage is output to the coupling decoupling network through the coaxial cable, and is directly coupled to the working power supply of the device under test through the coupling decoupling network; the surge generator is connected to the second coupling decoupling network through a coaxial cable, and the generated surge pulse is output to the coupling decoupling network through the coaxial cable, and is directly coupled to the working power supply of the device under test through the coupling decoupling network; the radio frequency inductive conducted disturbance generator is connected to the third coupling decoupling network through a coaxial cable, and the generated conducted disturbance voltage is output to the coupling decoupling network through the coaxial cable, and is directly coupled to the working power supply of the device under test through the coupling decoupling network;

[0047] The first coupling-decoupling network, the second coupling-decoupling network, the third coupling-decoupling network and the device under test are placed in the temperature and humidity adjustment module, and the device under test is placed on an insulating support;

[0048] The temperature and humidity adjustment module adjusts the temperature and humidity of the environment in which the device under test is located according to the instructions of the online monitoring system;

[0049] The online monitoring system includes a voltage sensor, a current sensor and a host computer, which are used to monitor the protection current error, measurement error current, voltage amplitude error and voltage phase error during the voltage application process, and determine whether the device under test is damaged, communication is interrupted, packet is lost, quality output is changed and output waveform is distorted.

[0050] The present invention tests the corresponding standard electromagnetic interference (electrical fast transient, surge and conduction immunity) at different temperatures and humidities. According to the test requirements: the temperature and humidity condition module requires control of temperature (-50℃—+85℃), humidity (≤95%), and the electromagnetic disturbance source includes electrical fast transient pulse group immunity higher than level 4, surge immunity higher than level 4, and radio frequency induction conduction immunity higher than level 3.

[0051] There are many electromagnetic interferences in the substation, and the interference sources can be roughly divided into: high-voltage switch operation, lightning strike, system short circuit fault, induced electromagnetic field, etc. The electromagnetic interference sources mainly include electrical fast transient pulse group (EFT / B), surge (Surge), and radio frequency induced conducted immunity (CS).

[0052] (I) Electrical fast transient pulse group (EFT / B)

[0053] Place the electromagnetic disturbance module outside the temperature and humidity module, connect it to the CDN via a coaxial cable, and place the CDN and the device under test in a temperature and humidity environment box.

[0054] The schematic diagram of the EFT / B electrical fast transient pulse group generator is as follows: Figure 2The electrical fast transient pulse group generator includes a high voltage power supply U, an energy storage capacitor C c , switch Switch, pulse duration adjustment resistor R S , impedance matching resistor R m and the DC blocking capacitor C d ; High voltage power supply U continuously supplies energy storage capacitor C c When the voltage reaches the preset value, the switch is closed to charge the energy storage capacitor C c The voltage across the two ends is released, and the resistance R is adjusted during the pulse duration. S A fast transient pulse signal is formed on the m and the DC blocking capacitor C d The signal is output to the coupling-decoupling network through a 50Ω coaxial cable, and the fast transient pulse group disturbance voltage is directly coupled to the working power supply of the device under test through the coupling-decoupling network. c The energy storage capacitor is charged. When it reaches a certain voltage, the Switch is closed to release the voltage across the energy storage capacitor. S The required fast transient pulse signal is formed on the m and the DC blocking capacitor C d The signal is output through a 50Ω coaxial cable.

[0055] The first coupling-decoupling network adopts a capacitive coupling clamp or CDN. When the coupling / decoupling network is used for experiments of AC / DC power ports, the first coupling-decoupling network includes a decoupling part and a coupling part; the decoupling part includes a plurality of groups of decoupling units in parallel, each group of decoupling units includes a filter capacitor, a decoupling resistor and a ferrite connected in sequence, and the coupling part includes a plurality of coupling capacitors in parallel; the plurality of groups of decoupling units and the plurality of coupling capacitors are connected one by one to three phase lines, a neutral line or a protective ground. Figure 3 Take a three-phase power supply as an example. The typical coupling / decoupling network characteristics are as follows:

[0056] ——Ferrite decoupling inductor:>100uH

[0057] ——Coupling capacitor: 33nF

[0058] The single-phase test is similar. You only need to treat L1, L2, and L3 as L for wiring test. Figure 4 shown. Figure 5 This is an example wiring diagram of an experimental configuration for direct coupling of electrical fast transient pulse group disturbance voltage through a coupling / decoupling network. Figure 6This is the experimental arrangement diagram for applying the disturbance test voltage to the signal and control ports using a capacitive coupling clamp. The cable should be placed in the center of the coupling clamp. The connected non-test equipment or auxiliary equipment can be appropriately decoupled.

[0059] (2) Surge

[0060] There are two types of combination wave generators for surge generators. Choose one based on the type of port being tested. For ports connected to outdoor symmetrical communication lines, use a 10 / 700us combination wave generator. For other cases, use a 1.2 / 50us combination wave generator. We selected a 1.2 / 50us combination wave generator for testing.

[0061] The surge waveform produced by the generator is:

[0062] ——Open circuit voltage wavefront time: 1.2us

[0063] ——Open circuit voltage duration: 50us

[0064] ——Short-circuit current wavefront time: 8us

[0065] ——Short circuit current duration: 20us

[0066] Figure 7 This is the circuit schematic diagram of the 1.2 / 50us combination wave generator. Select different components R s1 , R s2 , R m , L r , C c The value of makes the generator produce a voltage surge of 1.2 / 50us (open circuit condition) and a current surge of 8 / 20us (short circuit condition). The ratio of the open circuit voltage peak value to the short circuit output current peak value of the same output port of the combination wave generator is regarded as the effective output impedance. The effective output impedance of this generator is 2Ω.

[0067] On the AC or DC power line, the decoupling network presents a high impedance to the surge wave, but at the same time allows current to pass through the EUT. This impedance can cause a voltage wave to be generated at the output of the CDN, while also preventing the reverse flow of the surge current back to the AC or DC power supply. The coupling element is designed with a high-voltage capacitor.

[0068] For I / O lines and communication lines, the series impedance of the decoupling network will limit the bandwidth of data transmission. The coupling elements used are capacitors, clamping devices and lightning arresters.

[0069] The length of the power cable between the EUT and the coupling network should not exceed 2m.

[0070] The EUT is insulated from the ground, and the surge is applied directly to its metal shell; the terminal of the tested port (or auxiliary equipment) is grounded. This experiment is applicable to equipment with one or more shielded cables.

[0071] Except for the tested port, all ports connected to the EUT should be isolated from the ground by appropriate means such as a safety isolation transformer or a suitable CDN. The cable length between the tested port and the device at the other end of the cable connected to the port should be: 20m (preferred length); prefabricated cable with a minimum length of more than 10m. Cables ≤10m are not subject to surge testing.

[0072] The cable between EUT and AE is twisted pair and placed on an insulating support. Figure 8 This is the experimental configuration for shielded cables.

[0073] (III) Conducted Immunity (CS) of RF Induction

[0074] See also Fig. 9 The radio frequency inductive conducted interference generator includes a radio frequency signal source, a variable attenuator, a radio frequency switch, a broadband power amplifier, a filter and a fixed attenuator connected in sequence.

[0075] See also Fig.10 The third coupling-decoupling network, the device under test, the decoupling device and the auxiliary device are connected in sequence, and the device under test and the auxiliary device are both installed on an insulating support; the output end of the radio frequency inductive conducted interference generator is connected to the test port where the device under test is connected to the decoupling device.

[0076] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0077] Example 2

[0078] The second embodiment of the present invention is different from the previous embodiment in that:

[0079] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0080] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0081] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0083] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0084] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An electronic transformer immunity test system under multi-physical field coupling, characterized in that: It includes an electromagnetic disturbance module, a first coupling and decoupling network, a second coupling and decoupling network, a third coupling and decoupling network, a temperature and humidity adjustment module and an online monitoring system; The electromagnetic disturbance module is placed outside the temperature and humidity adjustment module, and includes an electrical fast transient pulse group generator, a surge generator, and a radio frequency induction conduction disturbance generator; The electrical fast transient pulse group generator is connected to the first coupling decoupling network through a coaxial cable, and the generated electrical fast transient pulse group disturbance voltage is output to the coupling decoupling network through the coaxial cable, and is directly coupled to the working power supply of the device under test through the coupling decoupling network; the surge generator is connected to the second coupling decoupling network through a coaxial cable, and the generated surge pulse is output to the coupling decoupling network through the coaxial cable, and is directly coupled to the working power supply of the device under test through the coupling decoupling network; the radio frequency inductive conducted disturbance generator is connected to the third coupling decoupling network through a coaxial cable, and the generated conducted disturbance voltage is output to the coupling decoupling network through the coaxial cable, and is directly coupled to the working power supply of the device under test through the coupling decoupling network; The first coupling-decoupling network, the second coupling-decoupling network, the third coupling-decoupling network and the device under test are placed in the temperature and humidity adjustment module, and the device under test is placed on an insulating support; The temperature and humidity adjustment module adjusts the temperature and humidity of the environment in which the device under test is located according to the instructions of the online monitoring system; The online monitoring system includes a voltage sensor, a current sensor and a host computer, which are used to monitor the protection current error, measurement error current, voltage amplitude error and voltage phase error during the voltage application process, and determine whether the device under test is damaged, communication is interrupted, packet is lost, quality output is changed and output waveform is distorted.

2. The electronic transformer immunity test system under multi-physical field coupling as claimed in claim 1, characterized in that: The electrical fast transient pulse group generator comprises a high voltage power supply U, an energy storage capacitor C c , switch Switch, pulse duration adjustment resistor R S , Impedance matching resistor R m and DC blocking capacitor C d ; High voltage power supply U continuously supplies energy storage capacitor C c When the voltage reaches the preset value, the switch is closed to charge the energy storage capacitor C c The voltage across the two ends is released, and the resistance R is adjusted during the pulse duration. S A fast transient pulse signal is formed on the m and DC blocking capacitor C d The signal is output to the coupling-decoupling network through a 50Ω coaxial cable, and the electrical fast transient pulse group disturbance voltage is directly coupled to the working power supply of the device under test through the coupling-decoupling network.

3. The electronic transformer immunity test system under multi-physical field coupling as claimed in claim 2, characterized in that: The first coupling-decoupling network includes a decoupling part and a coupling part; the decoupling part includes a plurality of groups of decoupling units in parallel, each group of decoupling units includes a filter capacitor, a decoupling resistor and a ferrite connected in sequence, and the coupling part includes a plurality of coupling capacitors in parallel; the plurality of groups of decoupling units and the plurality of coupling capacitors are connected one-to-one to three phase lines, a neutral line or a protective ground.

4. The electronic transformer immunity test system under multi-physical field coupling as claimed in claim 3, characterized in that: The first coupling-decoupling network is a capacitive coupling clamp or a CDN.

5. The electronic transformer immunity test system under multi-physical field coupling as claimed in claim 4, characterized in that: The surge generator includes two types of combination wave generators; for the port connected to the outdoor symmetrical communication line, a 10 / 700us combination wave generator is used; for other situations, a 1.2 / 50us combination wave generator is used.

6. The electronic transformer immunity test system under multi-physical field coupling as claimed in claim 5, characterized in that: The 1.2 / 50us combination wave generator includes a high voltage source, a charging resistor, an energy storage capacitor, a first pulse duration adjustment resistor, a second pulse duration adjustment resistor, an impedance matching resistor and an inductor; The high voltage source, charging resistor, switch, impedance matching resistor, inductor and second pulse duration adjusting resistor are connected in sequence; one end of the energy storage capacitor is connected to the connection point of the charging resistor and the switch, and the other end is connected to the end of the high voltage source away from the charging resistor; one section of the first pulse duration adjusting resistor is connected to the connection point of the switch and the impedance matching resistor, and the other end is connected to the end of the high voltage source away from the charging resistor; For AC or DC power lines, the coupling elements of the second coupling-decoupling network use high-voltage capacitors; for I / O lines and communication lines, the coupling elements of the second coupling-decoupling network use capacitors, clamping devices and lightning arresters.

7. The electronic transformer immunity test system under multi-physical field coupling as claimed in claim 6, characterized in that: The surge generator is directly connected to the metal casing of the device under test, and the terminal of the tested port is grounded; all ports connected to the device under test are isolated from the ground through a safety isolation transformer or a second coupling decoupling network; the cable length between the tested port and the device at the other end of the cable connected to the port is greater than 10m, and a twisted pair winding method is adopted.

8. The electronic transformer immunity test system under multi-physical field coupling as claimed in claim 7, characterized in that: The radio frequency inductive conducted disturbance generator comprises a radio frequency signal source, a variable attenuator, a radio frequency switch, a broadband power amplifier, a filter and a fixed attenuator which are connected in sequence; The third coupling-decoupling network, the device under test, the decoupling device and the auxiliary device are connected in sequence, and the device under test and the auxiliary device are both installed on an insulating support; the output end of the radio frequency inductive conducted interference generator is connected to the test port where the device under test is connected to the decoupling device.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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