Electromagnetic compatibility testing system and method for rolling stock converter

Abstract

The present invention discloses a system and method for testing electromagnetic compatibility (EMC) of rolling stock converters, which relate to the technical field of rail transit locomotives. The testing system comprises: a supporting mechanism, including an electromagnetic shielding mechanism, with a support turntable inside the electromagnetic shielding mechanism for supporting the converter to be tested; multiple cable interface units disposed inside the electromagnetic shielding mechanism for connecting cables outside the electromagnetic shielding mechanism to the converter to be tested; the multiple cable interface units include current input interface boxes, current output interface boxes, and single-phase input interface boxes for various current types; a cable pass-through mechanism, comprising: a metal box with threading holes for cables; metal particles injected into the metal box; and other components. This application effectively analyzes the EMC characteristics of the converter alone before installation, effectively avoiding the impact of environmental factors during on-site vehicle testing.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit locomotives, and in particular to a system and method for testing electromagnetic compatibility of a locomotive vehicle converter. Background Art

[0002] The electromagnetic environment of rail transit rolling stock is crucial, both for the vehicle systems themselves and for surrounding sensitive facilities. Currently, rail vehicle assembly equipment is highly integrated and automated, with narrow installation spaces, high equipment density, and a large number of high-voltage, high-power electrical components, creating an exceptionally complex electromagnetic environment. As rolling stock technology evolves, higher speeds, greater traction power, denser electrical equipment density, and more complex wiring will further complicate electromagnetic compatibility (EMC) issues, necessitating an increasing demand for product EMC testing.

[0003] In rail transit EMC testing, the external electromagnetic interference test for rolling stock is one of the full-vehicle type tests. If this test fails the requirements of standards or specifications, the vehicle will not be licensed for operation. Failure of the full-vehicle EMC test typically places pressure on component suppliers for rectification. The inverter components in rolling stock are a major source of electromagnetic interference. Currently, EMC testing for rolling stock inverters requires high-voltage, high-current power supply and high-power loads. In the absence of suitable laboratory testing equipment and methods, this relies primarily on full-vehicle radiated emission testing. Full-vehicle EMC testing can only be conducted on-site, where test results are significantly affected by the site environment. Furthermore, the sources of external EMC emissions from the vehicle are complex. For example, electromagnetic radiation generated by offline discharge of the pantograph and catenary is a major source of external EMC emissions from the vehicle. Consequently, the EMC emission test results from the vehicle are the result of the coupling of multiple sources, making it difficult to effectively analyze the EMC characteristics of the inverter alone and address the issue of full-vehicle test failure. Furthermore, post-installation EMC rectification of the inverter consumes significant manpower and resources. Therefore, there is an urgent need for a separate electromagnetic compatibility testing system and method for high-voltage and high-current converters of locomotives before installation. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a locomotive vehicle inverter electromagnetic compatibility testing system and method, which can effectively analyze the electromagnetic compatibility characteristics under the influence of only the inverter before installation, and effectively avoid the influence of on-site vehicle experimental environmental factors.

[0005] The specific technical solution of the embodiment of the present invention is:

[0006] A locomotive vehicle converter electromagnetic compatibility test system, the locomotive vehicle converter electromagnetic compatibility test system comprising:

[0007] A carrying mechanism, comprising an electromagnetic shielding mechanism capable of shielding external electromagnetic radiation, wherein the electromagnetic shielding mechanism has a supporting turntable inside, and the supporting turntable is used to carry the converter to be tested;

[0008] Multiple cable interface units are provided inside the electromagnetic shielding mechanism, used for connecting cables outside the electromagnetic shielding mechanism to the converter to be tested, and the multiple cable interface units include current input interface boxes, current output interface boxes, and single-phase input interface boxes for multiple different current types;

[0009] The cable pass-through mechanism comprises: a metal box body connected to the electromagnetic shielding mechanism, the metal box body having a threading hole for the cable to pass through; metal particles injected into the metal box body; the cable outside the electromagnetic shielding mechanism can pass through the threading hole to connect to the current input interface box and / or the current output interface box;

[0010] A high-voltage power supply unit, which is used to convert the input electricity into single-phase electricity, AC electricity, or DC electricity for output, and can output the input electricity after voltage transformation;

[0011] The power supply filter unit is used to filter the current input cable from the high-voltage power supply unit to the current input interface box and the current output cable from the current output interface box to the high-voltage power supply unit to filter out high-frequency interference signals;

[0012] The load system includes a motor load system and an impedance load system. The motor load system is used to simulate the operating load of a real locomotive vehicle. The impedance load system is used to provide an adjustable load and a resistance load.

[0013] The electromagnetic compatibility test system is used to test the electromagnetic compatibility radiation characteristics or anti-interference characteristics of the converter to be tested when the converter is in operation.

[0014] Preferably, a cable protection mechanism is provided under the support turntable, the cable protection mechanism comprising: a base with an annular guide rail; a slide rail in an arc shape, the slide rail being arranged in the guide rail, and the slide rail being able to rotate along the center of the guide rail; a first chain, which is wound between the side wall of the guide rail and the outer side wall of the slide rail, and after passing through one end of the slide rail, is wound between the side wall of the guide rail and the inner side wall of the slide rail, the first chain is located between the side wall of the guide rail and the outer side wall of the slide rail, and one end is fixed to the guide rail; a second chain, which is wound between the side wall of the guide rail and the outer side wall of the slide rail, and after passing through the other end of the slide rail, is wound between the side wall of the guide rail and the inner side wall of the slide rail, and the second chain is located between the side wall of the guide rail and the outer side wall of the slide rail, and one end is fixed to the guide rail;

[0015] A first cable is inserted into end A of the first chain and exits from end B of the first chain, and a second cable is inserted into end C of the second chain and exits from end D of the first chain;

[0016] The support turntable is fixedly connected to the slide rail, and multiple cable interface units are installed on the support turntable; one end of the first cable located at the B end of the first chain is connected to the current input interface box or the current output interface box, and one end of the second cable located at the D end of the second chain is connected to the current output interface box or the current input interface box; one end of the first cable located at the A end of the first chain can pass through the wire hole or can be connected to the power supply filter unit; one end of the second cable located at the C end of the second chain can pass through the wire hole or can be connected to the power supply filter unit.

[0017] Preferably, the electromagnetic shielding mechanism comprises: an electromagnetic shielding body made of a shielding metal plate, and a ferrite absorbing material and a polyurethane foam absorbing material are provided on the wall surface of the electromagnetic shielding body.

[0018] Preferably, the high-voltage power supply unit includes a first power supply unit for converting three-phase electricity into single-phase electricity; a second power supply unit for transforming alternating current; a third power supply unit for transforming direct current; and a high-voltage line switching unit for realizing on-off switching.

[0019] Preferably, the locomotive vehicle converter electromagnetic compatibility test system has a first working mode;

[0020] In the first working mode, the converter to be tested is mounted on the supporting turntable, and the input and output ends of the converter to be tested are respectively connected to the AC input interface box in the current input interface box and the AC output interface box in the current output interface box; the converter to be tested is a traction converter;

[0021] The output end of the second power supply unit is connected to the high-voltage line adapter unit and then to one end of the first cable passing through the wire hole; the one end of the second cable passing through the wire hole is connected to the high-voltage line adapter unit and then to the motor load system.

[0022] Preferably, the locomotive vehicle converter electromagnetic compatibility test system has a second working mode;

[0023] In the second working mode, the converter to be tested is mounted on the supporting turntable, and the input and output ends of the converter to be tested are respectively connected to the DC input interface box in the current input interface box and the DC output interface box in the current output interface box; the converter to be tested is an auxiliary converter;

[0024] The DC input interface box is connected to one of the power supply filter units via a fourth cable, and then connected to the third power supply unit via a high-voltage line adapter unit; the DC output interface box is connected to another of the power supply filter units via a third cable, and then the other of the power supply filter units is connected to another of the high-voltage line adapter units, and the high-voltage line adapter units are connected to the impedance load system;

[0025] The fourth cable enters from end A of the first chain and exits from end B of the first chain. One end of the fourth cable located at end B of the first chain is connected to the DC input interface box.

[0026] Preferably, the locomotive vehicle converter electromagnetic compatibility test system has a third working mode;

[0027] In the third working mode, the converter to be tested is mounted on the supporting turntable, and the input end of the converter to be tested is connected to the DC input interface box in the current input interface box, and the motor load output end of the converter to be tested is connected to the DC output interface box in the current output interface box; the auxiliary load output end of the converter to be tested is connected to the DC output interface box in the current output interface box, and the converter to be tested is a traction auxiliary converter;

[0028] The output end of the second power supply unit is connected to one end of the first cable passing through the wire hole after passing through another high-voltage line adapter unit; one end of the second cable passing through the wire hole is connected to one high-voltage line adapter unit and then connected to the motor load system; after the DC output interface box is connected to the power supply filter unit through a third cable, the power supply filter unit is connected to another high-voltage line adapter unit, and the high-voltage line adapter unit is then connected to the impedance load system.

[0029] Preferably, the third cable passes through the C end of the second chain and exits from the D end of the first chain, and one end of the third cable located at the D end of the second chain is connected to the DC output interface box.

[0030] Preferably, the locomotive vehicle converter electromagnetic compatibility test system has a fourth working mode;

[0031] In the fourth working mode, the converter to be tested is mounted on the supporting turntable, and the input end of the converter to be tested is connected to the single-phase input interface box in the current input interface box, the motor load output end of the converter to be tested is connected to the DC output interface box in the current output interface box; the auxiliary load output end of the converter to be tested is connected to the DC output interface box in the current output interface box, and the converter to be tested is an integrated converter;

[0032] The output end of the first power supply unit is connected to one of the power supply filter units through another high-voltage line adapter unit, and then connected to the single-phase input interface box in the current input interface box; one end of the second cable passing through the wire hole is connected to one of the high-voltage line adapter units, and then connected to the motor load system; the DC output interface box is connected to another of the power supply filter units through a third cable, and then the power supply filter unit is connected to another of the high-voltage line adapter units, and the high-voltage line adapter unit is then connected to the impedance load system;

[0033] The power supply filtering unit is connected to the single-phase input interface box in the current input interface box through a fourth cable. The fourth cable enters from the A end of the first chain and exits from the B end of the first chain. One end of the first cable of the fourth cable located at the B end of the first chain is connected to the single-phase input interface box.

[0034] A testing method using any of the above-mentioned rolling stock converter electromagnetic compatibility testing systems, the testing method comprising:

[0035] Selecting corresponding operating modes for different types of converters to be tested, and connecting the rolling stock converter electromagnetic compatibility test system according to the electrical layout of the corresponding operating mode;

[0036] Arrange the electromagnetic compatibility test system according to the RF radiation emission test and RF radiation immunity test standards;

[0037] Start the power supply to power the rolling stock converter electromagnetic compatibility test system, turn on the high-voltage line switching unit, supply power according to the power supply requirements of the converter to be tested, and start the converter to be tested;

[0038] The electromagnetic compatibility test system is used to test the electromagnetic compatibility radiation characteristics or anti-interference characteristics of the converter under different working conditions.

[0039] The technical solution of the present invention has the following significant beneficial effects:

[0040] 1. This application can conduct electromagnetic compatibility testing of high-voltage and high-current converter products for rolling stock in a laboratory darkroom, solving the coupling effect of external environmental radiation sources on the test during on-site testing.

[0041] 2. This application can implement electromagnetic compatibility testing of the converter with motor load and impedance load at different powers according to the actual vehicle operating conditions of the converter.

[0042] 3. This application can meet the on-load electromagnetic compatibility test of different types of converters such as locomotives, urban rail, and EMUs, including traction converters, auxiliary converters, and traction auxiliary converters.

[0043] 4. This application can meet the requirements of conducting electromagnetic compatibility tests in a darkroom for converters under different power supply modes. Different power supply modes may include single-phase power, alternating current, and direct current.

[0044] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby. Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0046] Figure 1 This is a schematic diagram of an electromagnetic compatibility test system for a rolling stock converter in one embodiment of the present invention;

[0047] Figure 2 Schematic diagram of the distribution of cable interface units in an embodiment of the present invention;

[0048] Figure 3 Schematic diagram of the principle of the cable protection mechanism in an embodiment of the present invention;

[0049] Figure 4 Schematic diagram of the structure of the cable pass-through device in an embodiment of the present invention;

[0050] Figure 5 This is an electrical topology diagram of the electromagnetic compatibility test system for a rolling stock converter according to an embodiment of the present invention;

[0051] Figure 6 Schematic diagram of the principle of the electromagnetic compatibility test system for a rolling stock converter in a first working mode according to an embodiment of the present invention;

[0052] Figure 7 Schematic diagram of the principle of the electromagnetic compatibility test system for a rolling stock converter in a second working mode according to an embodiment of the present invention;

[0053] Figure 8 Schematic diagram of the principle of the electromagnetic compatibility test system for a rolling stock converter in a third working mode according to an embodiment of the present invention;

[0054] Figure 9 Schematic diagram of the principle of the electromagnetic compatibility test system for a locomotive vehicle converter in the fourth working mode according to an embodiment of the present invention.

[0055] Reference numerals in the above drawings:

[0056] 11. Electromagnetic shielding mechanism; 12. Support turntable; 13. Cable protection mechanism; 131. Base; 1311. Guide rail; 132. Slide rail; 133. First chain; 134. Second chain; 135. First cable; 136. Second cable; 14. Converter to be tested; 2. Cable interface unit; 3. Cable pass-through mechanism; 31. Metal box; 32. Wire hole; 33. Metal cover; 4. High-voltage power supply unit; 41. High-voltage line transfer unit; 5. Power supply filter unit; 6. Load system; 61. Motor load system; 62. Impedance load system. DETAILED DESCRIPTION

[0057] The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are for illustrative purposes only and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, skilled artisans can conceive of any possible variations based on the present invention, all of which should be considered within the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, internal communication between two elements, direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0059] In order to effectively analyze the electromagnetic compatibility characteristics under the influence of the converter before installation, and effectively avoid the influence of the on-site vehicle test environment factors, Figure 1 This is a schematic diagram of an electromagnetic compatibility test system for a rolling stock converter in one embodiment of the present invention. Figure 4 FIG. 1 is a schematic structural diagram of a cable pass-through device according to an embodiment of the present invention. Figure 1 and Figure 4 As shown, the electromagnetic compatibility test system for the locomotive vehicle converter may include: a carrying mechanism, which includes an electromagnetic shielding mechanism 11 capable of shielding external electromagnetic radiation, the electromagnetic shielding mechanism 11 has a supporting turntable 12 inside, the supporting turntable 12 is used to carry the converter 14 to be tested; a plurality of cable interface units 2 arranged inside the electromagnetic shielding mechanism 11, used for transit connection between the cables outside the electromagnetic shielding mechanism 11 and the converter 14 to be tested, the plurality of cable interface units 2 including a current input interface box, a current output interface box and a single-phase input interface box for multiple different current types; a cable pass-through mechanism 3, including: a metal box body 31 made of metal connected to the electromagnetic shielding mechanism 11, the metal box body 31 is provided with a threading hole 32 for the cable to pass through; metal particles injected into the metal box body 31; the electromagnetic shielding mechanism The cables outside 11 can be connected to the current input interface box and / or the current output interface box through the wire hole 32; the high-voltage power supply unit 4 is used to convert the input electricity into single-phase electricity, AC electricity, and DC electricity for output, and can output the input electricity after voltage transformation; the power supply filter unit 5 is used to filter the current input cable from the high-voltage power supply unit 4 to the current input interface box, and the current output cable from the current output interface box to the high-voltage power supply unit 4 to filter out high-frequency interference signals; the load system 6 includes a motor load system 61 and an impedance load system 62, the motor load system 61 is used to simulate the operating load under the actual working conditions of the locomotive vehicle, and the impedance load system 62 is used to provide an adjustable load and a resistance load; the electromagnetic compatibility test system is used to test the electromagnetic compatibility radiation characteristics or anti-interference characteristics of the converter 14 to be tested when it is working.

[0060] like Figure 1As shown, the supporting mechanism may include an electromagnetic shielding mechanism 11 capable of shielding external electromagnetics, and the electromagnetic shielding mechanism 11 may completely cover the converter 14 to be tested. As a feasible method, the electromagnetic shielding mechanism 11 may include: an electromagnetic shielding body made of a shielding metal plate, and ferrite absorbing materials and polyurethane foam absorbing materials are provided on the wall surface of the electromagnetic shielding body, so as to improve the electromagnetic shielding effect. The electromagnetic shielding mechanism 11 is used to provide a clean electromagnetic environment for the converter 14 to be tested, shielding the influence of external electromagnetic interference sources on the product to be tested and the influence of the product to be tested on the outside world. The electromagnetic shielding body may have a door body with electromagnetic shielding function that can be opened and closed, so that the converter 14 to be tested can be installed in the electromagnetic shielding body.

[0061] The electromagnetic shielding mechanism 11 includes a support turntable 12 for supporting a current transformer 14 to be tested. Furthermore, the support turntable 12 can rotate, thereby rotating the current transformer 14 on the support turntable 12, thereby facilitating the electromagnetic compatibility test system to test the electromagnetic compatibility radiation characteristics or anti-interference characteristics of the current transformer 14 at different angles.

[0062] A plurality of cable interface units 2 are arranged inside the electromagnetic shielding mechanism 11. The plurality of cable interface units 2 are used for the transit connection between the cables outside the electromagnetic shielding mechanism 11 and the converter 14 to be tested, and the plurality of cable interface units 2 can be connected to the input and output ends of the converter 14 to be tested. The plurality of cable interface units 2 include a current input interface box, a current output interface box and a single-phase input interface box for a variety of different current types. The current input interface box and the single-phase input interface box can be connected to the input end of the converter 14 to be tested, and the current output interface box can be connected to the output end of the converter 14 to be tested. The plurality of cable interface units 2 can be fixedly mounted on the support turntable 12 and distributed circumferentially around the center of the support turntable 12. For example, as Figure 2 As shown, CP1 is a single-phase 25kV high-voltage power input interface box, CP2 and CP3 are the converter's 4kV AC power input interface boxes, CP4 is the converter's 4kV DC power input interface box, CP5-CP8 are the converter's 4kV AC power output interface boxes, and CP9 is the converter's 380V AC power output interface box. To prevent the interface boxes from being unable to bear the weight during the converter's transfer from outside the electromagnetic shielding mechanism 11 to the turntable, interface box CP1 is positioned at the center of the turntable, while CP2-CP9 are positioned to one side of the center. This approach not only addresses the load-bearing issues inherent in the converter's transport channel 14, but also facilitates wiring of the converter 14 under test.

[0063] The cable pass-through mechanism 3 is used to allow cables outside the electromagnetic shielding mechanism 11 to pass through the electromagnetic shielding mechanism 11, ensuring that the shielding performance of the electromagnetic shielding mechanism 11 is not affected after the cables are passed through. In the prior art, filters are generally used to pass cables through the electromagnetic shielding mechanism 11. However, since the high-voltage AC input signal and the high-voltage AC output signal after passing through the high-voltage power supply unit 4 are pulse-width modulated PWM signals, the use of traditional filters will cause waveform distortion, thereby affecting the effective transmission of the signals. Therefore, in this application, a cable pass-through mechanism 3 is required to ensure the effective transmission of the high-voltage AC input signal and the high-voltage AC output signal after passing through the high-voltage power supply unit 4 without affecting the shielding performance of the electromagnetic shielding mechanism 11. The cable pass-through mechanism 3 can include a metal box 31 connected to the electromagnetic shielding mechanism 11, the metal box 31 having a threading hole 32 for the cable to pass through; metal particles injected into the metal box 31; and cables outside the electromagnetic shielding mechanism 11 can pass through the threading hole 32 to connect to the current input interface box and / or the current output interface box. To facilitate the injection of metal particles into the metal box body 31, a metal cover 33 can be installed on the upper end surface of the metal box body 31. The interior of the metal box body 31 is formed into a cavity structure. The first side wall of the metal box body 31 is mounted at the hole position of the electromagnetic shielding mechanism 11 using bolts or rivets. The second side wall of the metal box body 31, opposite the first side wall, is provided with a plurality of threading holes 32 for the passage of cables. The cables are inserted horizontally into the threading holes 32. After the cables have been inserted into the threading holes 32, the metal cover 33 is opened to inject metal particles into the metal box body 31, completely filling the space between the cables and the space between the cables and the metal box body 31, thereby ensuring the shielding effect of the electromagnetic shielding mechanism 11.

[0064] The high-voltage power supply unit 4 is used to convert the input power into single-phase power, AC power, and DC power for output, and can transform the input power before output. The high-voltage power supply unit 4 may include a first power supply unit for converting three-phase power into single-phase power; a second power supply unit for transforming AC power; a third power supply unit for transforming DC power; and a high-voltage line switching unit 41 for realizing on-off switching. For example, Figure 5As shown, the first power supply unit can provide single-phase 25kV power. A three-phase to single-phase transformer device is used to convert three-phase 10kV to single-phase 25kV, thereby providing power to the darkroom with a rated voltage of 25kV and a rated current of 160A. The transformer has a capacity of 4000kVA and a voltage regulation range of 17kV to 31.5kV. This voltage is switched and transferred via a 25kV power supply transfer cabinet 1GB. The second power supply unit can provide two single-phase AC power supplies through a traction transformer, with a three-speed voltage regulation function. The rated voltages can be AC970V, AC1500V, and AC1900V, respectively. The two single-phase AC power supply transfer cabinets 2GB are used for switching and transferring. The third power supply unit can provide 0-4000V adjustable DC power to the electromagnetic shielding mechanism 11. The DC power supply output is output through a rectifier transformer and a four-quadrant rectifier power supply, with a power of up to 2400kW. The DC power supply transfer cabinet 3GB is used for switching and transferring. The high-voltage line transfer unit 41 is used to realize on-off switching, and can include a 25kV power transfer cabinet 1GB, a DC power transfer cabinet 2GB, a 2-way single-phase AC power transfer cabinet 3GB, a 4-way unit load transfer cabinet 4GB and an auxiliary transformer load transfer cabinet 1DB, which can switch input and output according to different power supply requirements and load requirements.

[0065] like Figure 1 and Figure 4 As shown, the power supply filter unit 5 is used to filter the current input cable from the high-voltage power supply unit 4 to the current input interface box and the current output cable from the current output interface box to the high-voltage power supply unit 4 to filter out high-frequency interference signals. The power supply filter unit 5 can ensure that after the cable passes through the electromagnetic shielding mechanism 11, the external interference signal is shielded outside the electromagnetic shielding mechanism 11. At the same time, the interference signal of the converter 14 to be tested and the external interference signal are decoupled to ensure the accuracy of the test. For example, there can be multiple power supply filter units 5, which can provide filtering functions for cables that are fed with 25kV high voltage electricity, cables that are fed with 4kV direct current, and cables that are fed with 380V electricity.

[0066] The load system 6 may include a motor load system 61 and an impedance load system 62. The motor load system 61 is used to simulate the operating load under the actual working conditions of the locomotive vehicle, and the impedance load system 62 is used to provide adjustable inductive load and resistive load. The motor load system 61 may include at least one of the following: a test transformer, a test converter, a test motor, a gearbox, a test motor, and a test converter, the output end of which is connected to the test motor. The motor load system 61 can fully simulate the actual working conditions of the locomotive vehicle, including different vehicle control modes (vehicle control, frame control, axle control), braking conditions and traction conditions under different power levels. When the test converter controls the test motor to operate under traction conditions, the test converter and the test motor operate under braking conditions. Conversely, when the test converter controls the test motor to operate under braking conditions, the test converter and the test motor operate under traction conditions. Different combinations of the four motors enable different vehicle control modes. In axle control, the four motors are controlled individually; in rack control, the motors are combined in pairs; and in vehicle control, the four motors are combined. The impedance load system 62 primarily provides adjustable inductive and resistive loads for the auxiliary converter, allowing for different power levels to be selected based on the actual vehicle operating conditions. The resistive load has nine levels with a total power of 300kW, including 1kW, 2kW, 4kW, 8kW, 16kW, 32kW, 64kW, 84kW, and 90kW. The adjustable load has ten levels with a total power of 240kvar, including 0.5kvar, 1kvar, 2kvar, 4kvar, 8kvar, 10kvar, 20kvar, 40kvar, 75kvar, and 80kvar.

[0067] The electromagnetic compatibility (EMC) testing system is used to test the electromagnetic compatibility (EMC) radiation characteristics or anti-interference characteristics of the converter 14 under test during operation. The EMC testing system primarily includes a radiation emission testing system and a radiation immunity testing system. The radiation emission testing system is used to test the electromagnetic radiation characteristics of the converter 14 under test. The radiation emission testing system may include a receiving antenna, a measurement receiver, and a control system. The receiving antenna is located within the electromagnetic shielding mechanism 11 and connected to an external measurement receiver via a data cable. The external measurement receiver is then electrically connected to the control system. The receiving antenna includes a log-periodic antenna and a loop antenna, and is used to receive electromagnetic wave signals in different frequency bands emitted by the converter 14 under test during operation. The measurement receiver collects and converts the signals and transmits them to the control system. The measurement receiver may include an electromagnetic wave signal amplification module, primarily used to amplify weak electromagnetic wave signals and reduce the noise floor of the measurement system. The control system also controls the operation of the receiving antenna, the rotation of the support turntable 12, and displays measurement results. The radiated immunity test system is primarily used to test the resistance of the current transformer 14 to external electromagnetic interference. The radiated immunity test system primarily includes a transmitting antenna, a signal source, a power meter with a probe, a power amplifier, and an RF switch. The transmitting antenna is located within the electromagnetic shielding mechanism 11. The signal source generates modulated voltage signals of different frequency bands, which are amplified by the power amplifier and finally converted into electromagnetic wave signals of different frequency bands by the transmitting antenna for radiation. These radiated electromagnetic waves are then subjected to interference coupling through the cables or apertures of the current transformer 14 under test, thereby verifying the anti-interference performance of the current transformer 14 under test during operation. The RF switch is primarily used to switch between different operating modes of the power amplifier. The power meter with a probe is primarily used to measure the power of the electromagnetic waves emitted by the transmitting antenna and provide feedback to the control system. The probe can be located within the electromagnetic shielding mechanism 11, while the power meter is located externally to control and process the signals received by the probe and measure the power of the electromagnetic waves emitted by the transmitting antenna. The control system primarily controls the operation of the signal source and RF switch and displays the actual operating curves of the signal source and power amplifier.

[0068] Furthermore, the cables used to connect electrical equipment in the locomotive vehicle converter electromagnetic compatibility test system are all shielded cables to ensure the shielding effectiveness of the darkroom.

[0069] During the electromagnetic compatibility test system test, the receiving antenna and transmitting antenna installed in the electromagnetic shielding mechanism 11 of the electromagnetic compatibility test system are generally fixed in position. In order to be able to test the electromagnetic compatibility radiation characteristics or anti-interference characteristics of the receiving antenna and transmitting antenna at different orientations of the converter 14 to be tested, the support turntable 12 can be rotated to drive the converter 14 to be tested to rotate relative to the receiving antenna and transmitting antenna. However, this will cause the cables connected to the cable interface unit 2 on the support turntable 12, which pass through the wire hole 32 to the outside of the electromagnetic shielding mechanism 11 or directly pass through the electromagnetic shielding mechanism 11, to become entangled with each other near the support turntable 12, or get stuck under the support turntable 12, etc., and be damaged, posing a safety hazard. As a feasible option, a cable protection mechanism 13 can be provided under the support turntable 12. Figure 3 FIG. 1 is a schematic diagram showing the principle of a cable protection mechanism according to an embodiment of the present invention. Figure 3 As shown, the cable protection mechanism 13 may include: a base 131 having a circular guide rail 1311; a circular arc-shaped slide rail 132, the slide rail 132 being arranged in the guide rail 1311 and being able to rotate along the center of the guide rail 1311; a first chain 133, which is wound between the side wall of the guide rail 1311 and the outer side wall of the slide rail 132, passes through one end of the slide rail 132, and is wound between the side wall of the guide rail 1311 and the inner side wall of the slide rail 132. The first chain 133 is located between the side wall of the guide rail 1311 and the outer side wall of the slide rail 132, and one end A of the first chain 133 is connected to the guide rail 131. 1 is fixed; the second chain 134 is wound between the side wall of the guide rail 1311 and the outer side wall of the slide rail 132, passes through the other end of the slide rail 132, and is wound between the side wall of the guide rail 1311 and the inner side wall of the slide rail 132. One end C of the second chain 134 located between the side wall of the guide rail 1311 and the outer side wall of the slide rail 132 is fixed to the guide rail 1311; the first cable 135 passes through the A end of the first chain 133 and exits from the B end of the first chain 133. The second cable 136 passes through the C end of the second chain 134 and exits from the D end of the first chain 133.

[0070] In the above structure, the support turntable 12 is fixedly connected to the slide rail 132, and multiple cable interface units 2 are installed on the support turntable 12. One end of the first cable 135 located at the B end of the first chain 133 is connected to the current input interface box or the current output interface box, and one end of the second cable 136 located at the D end of the second chain 134 is connected to the current output interface box or the current input interface box. One end of the first cable 135 located at the A end of the first chain 133 can pass through the threading hole 32 or can be connected to the power supply filter unit 5. One end of the second cable 136 located at the C end of the second chain 134 can pass through the threading hole 32 or can be connected to the power supply filter unit 5.

[0071] like Figure 3 As shown, when the slide rail 132 and the support turntable 12 rotate clockwise together, since the A end of the first chain 133 is fixed to the outer wall of the guide rail 1311 and the B end is fixed to the inner wall of the slide rail 132, when the slide rail 132 rotates, it drives the first chain 133 to rotate, and the end on the left side of the slide rail 132 presses against the middle of the first chain 133 and moves upward, thereby causing the other movable end of the first chain 133 to move upward. In this way, one end of the first cable 135 located at the B end of the first chain 133 will also move upward (i.e., rotate clockwise), and the degree of its rotation will be exactly the same as the degree of clockwise rotation of the slide rail 132 and the support turntable 12. Therefore, one end of the first cable 135 located at the B end of the first chain 133 and the current input interface box fixedly installed on the support turntable 12 always remain relatively stationary and will not rotate relative to each other, thereby ensuring the reliability and safety of the electrical connection of the first cable 135. The end of the first chain 133 on the left side of the guide rail 1311 can change shape as the slide rail 132 rotates, continuously satisfying the rotation of the slide rail 132, while also providing good protection for the first cable 135 passing through it. The principle of the second cable 136 is the same as that of the first cable 135 and will not be repeated here.

[0072] By changing the arrangement of electrical devices in the locomotive vehicle converter electromagnetic compatibility test system through cables, the locomotive vehicle converter electromagnetic compatibility test system can have a first working mode. Figure 6 As shown, in the first operating mode, the converter 14 to be tested is mounted on the support turntable 12, and the input and output ends of the converter 14 to be tested are respectively connected to the AC input interface box in the current input interface box and the AC output interface box in the current output interface box; the converter 14 to be tested is a traction converter. The output end of the second power supply unit is connected to one end of the first cable 135 extending from the wire hole 32 through a high-voltage line adapter unit 41; one end of the second cable 136 extending from the wire hole 32 is connected to another high-voltage line adapter unit 41, and then connected to the motor load system 61. The first operating mode is applicable to traction converters for locomotives, urban rail transit, and EMUs.

[0073] In a specific embodiment, the input end of the converter 14 to be tested is connected to the copper busbar of the converter 4kV AC input interface box in the cable interface unit 2 via a shielded cable, and the output end of the converter 14 to be tested is connected to the copper busbar of the converter 4kV AC output interface box in the cable interface unit 2. The copper busbar of the converter 4kV AC output interface box passes through a second cable 136 laid in the cable protection mechanism 13. The second cable 136 is then connected to the high-voltage cable transfer cabinet in the high-voltage line transfer unit 41 via a cable pass-through mechanism 3, and finally connected to the motor load system 61 via the high-voltage cable transfer cabinet. The copper busbar of the converter 4kV AC input interface box passes through a first cable 135 laid in the cable protection mechanism 13. The first cable 135 is then connected to the high-voltage cable transfer cabinet in another high-voltage line transfer unit 41 via a cable pass-through mechanism 3, and finally connected to the 4kV AC power supply unit.

[0074] The above-mentioned locomotive vehicle converter electromagnetic compatibility test system can also have a second working mode. In the second working mode, if Figure 7 As shown, the converter 14 to be tested is mounted on the support turntable 12, and the input and output ends of the converter 14 to be tested are respectively connected to the DC input interface box in the current input interface box and the DC output interface box in the current output interface box. The converter 14 to be tested is an auxiliary converter. The DC input interface box is connected to a power supply filter unit 5 via a fourth cable, and then connected to a third power supply unit via a high-voltage line adapter unit 41. The DC output interface box is connected to another power supply filter unit 5 via a third cable, and then the other power supply filter unit 5 is connected to another high-voltage line adapter unit 41, which is in turn connected to the impedance load system 62. The fourth cable enters from the A end of the first chain 133 and exits from the B end of the first chain 133. One end of the fourth cable, located at the B end of the first chain 133, is connected to the DC input interface box. The third cable enters the C end of the second chain 134 and exits the D end of the first chain 133. One end of the third cable located at the D end of the second chain 134 is connected to the DC output interface box. The second operating mode is applicable to auxiliary converters of locomotives, urban rail transit, and EMUs.

[0075] In a specific embodiment, the input end of the converter 14 to be tested is connected to the copper busbar of the converter 4kV DC input interface box in the cable interface unit 2 via a shielded cable, and the output end of the converter 14 to be tested is connected to the copper busbar of the converter 380V output interface box in the cable interface unit 2. The copper busbar of the converter 4kV DC input interface box passes through a fourth cable laid in the cable protection mechanism 13, then passes through the power supply filter unit 5 and is connected to the high-voltage cable transfer cabinet in the high-voltage line transfer unit 41, and finally is connected to the third power supply unit. The copper busbar of the converter 380V AC output interface box passes through a third cable laid in the cable protection mechanism 13, then passes through another power supply filter unit 5 and is connected to the high-voltage cable transfer cabinet in the high-voltage line transfer unit 41, and finally is connected to the impedance load system 62.

[0076] The above-mentioned locomotive vehicle converter electromagnetic compatibility test system can also have a third working mode. In the third working mode, if Figure 8 As shown, the converter 14 to be tested is mounted on the support turntable 12, and the input end of the converter 14 to be tested is connected to the DC input interface box in the current input interface box, and the motor load output end of the converter 14 to be tested is connected to the DC output interface box in the current output interface box; the auxiliary load output end of the converter 14 to be tested is connected to the DC output interface box in the current output interface box. The converter 14 to be tested is a traction auxiliary converter. The output end of the second power supply unit is connected to one end of the first cable 135 passing through the wire hole 32 through another high-voltage line adapter unit 41; one end of the second cable 136 passing through the wire hole 32 is connected to a high-voltage line adapter unit 41, and then connected to the motor load system 61. The DC output interface box is connected to the power supply filter unit 5 via a third cable, and the power supply filter unit 5 is then connected to another high-voltage line adapter unit 41, which is then connected to the impedance load system 62. The third cable enters the C end of the second chain 134 and exits the D end of the first chain 133. The end of the third cable located at the D end of the second chain 134 is connected to the DC output interface box. The third operating mode is applicable to traction auxiliary converters for locomotives, urban rail transit, and EMUs.

[0077] In a specific embodiment, the input end of the converter 14 to be tested is connected to the copper busbar of the converter 4kV AC input interface box in the cable interface unit 2 via a shielded cable, the motor load output end of the converter 14 to be tested is connected to the copper busbar of the converter 4kV AC output interface box in the cable interface unit 2, and the auxiliary load output end of the converter 14 to be tested is connected to the copper busbar of the converter 380V AC output interface box in the cable interface unit 2. The copper busbar of the converter 4kV AC input interface box passes through a first cable 135 laid in the cable protection mechanism 13, and the first cable 135 is then connected to a high-voltage cable transfer cabinet in another high-voltage line transfer unit 41 through a cable pass-through mechanism 3, and finally connected to the 4kV AC power supply unit. The copper busbar of the 4kV AC output interface box of the converter passes through a second cable 136 laid in the cable protection mechanism 13. Second cable 136 then passes through the cable pass-through mechanism 3 to connect to a high-voltage cable transfer cabinet in a high-voltage line transfer unit 41. Finally, through the high-voltage cable transfer cabinet, it connects to the motor load system 61. The copper busbar of the 380V output interface box of the converter is connected to the power supply filter unit 5 via a third cable, and then to another high-voltage line transfer unit 41. This other high-voltage line transfer unit 41 is then connected to the impedance load system 62.

[0078] The above-mentioned locomotive vehicle converter electromagnetic compatibility test system can also have a fourth working mode. In the fourth working mode, if Figure 9 As shown, the converter 14 to be tested is mounted on the support turntable 12, and the input end of the converter 14 to be tested is connected to the single-phase input interface box in the current input interface box, and the motor load output end of the converter 14 to be tested is connected to the DC output interface box in the current output interface box; the auxiliary load output end of the converter 14 to be tested is connected to the DC output interface box in the current output interface box. The converter 14 to be tested is an integrated converter. The output end of the first power supply unit is connected to a power supply filter unit 5, and then connected to the single-phase input interface box in the current input interface box; one end of the second cable 136 passing through the wire hole 32 is connected to a high-voltage line adapter unit 41, and then connected to the motor load system 61; the DC output interface box is connected to another power supply filter unit 5 through a third cable, and the power supply filter unit 5 is then connected to another high-voltage line adapter unit 41, and the high-voltage line adapter unit 41 is then connected to the impedance load system 62. The power supply filter unit 5 is connected to the single-phase input interface box in the current input interface box through a fourth cable. The fourth cable enters from the A end of the first chain 133 and exits from the B end of the first chain 133. One end of the fourth cable 135 located at the B end of the first chain 133 is connected to the single-phase input interface box.

[0079] In a specific embodiment, the fourth working mode is applicable to a 25kV power supply integrated converter. The input end of the converter 14 to be tested is connected to the copper busbar of the 25kV high-voltage interface box in the cable interface unit 2 via a shielded cable. The motor load output end of the converter 14 to be tested is connected to the copper busbar of the converter 4kV AC output interface box in the cable interface unit 2. The auxiliary load output end of the converter 14 to be tested is connected to the copper busbar of the converter 380V AC output interface box in the cable interface device. The copper busbar of the converter 4kV AC output interface box passes through a second cable 136 laid in the cable protection mechanism 13. The second cable 136 is then connected to a high-voltage cable transfer cabinet in a high-voltage line transfer unit 41 through a cable straight-through mechanism 3, and finally connected to the motor load system 61 through the high-voltage cable transfer cabinet. The copper busbar of the converter's 380V output interface box is connected to the power supply filter unit 5 via a third cable, then to another high-voltage line adapter unit 41, which in turn is connected to the impedance load system 62. The output of the first power supply unit is connected to a power supply filter unit 5 via yet another high-voltage line adapter unit 41, and then to the single-phase input interface box in the current input interface box via a fourth cable. The first power supply unit provides a single-phase 25kV supply.

[0080] This application also proposes a testing method using the above-mentioned rolling stock converter electromagnetic compatibility testing system, which may include:

[0081] The corresponding working mode is selected for different types of converters 14 to be tested, and the rolling stock converter electromagnetic compatibility test system is connected according to the electrical arrangement in the corresponding working mode.

[0082] Arrange the electromagnetic compatibility test system according to the RF radiation emission test and RF radiation immunity test standards.

[0083] The power supply is started to supply power to the locomotive vehicle converter electromagnetic compatibility test system, the high-voltage line switching unit 41 is turned on, power is supplied according to the power supply requirement of the converter 14 to be tested, and the converter 14 to be tested is started.

[0084] The electromagnetic compatibility test system is used to perform tests to obtain electromagnetic compatibility radiation characteristics or anti-interference characteristics of the converter 14 to be tested under different working conditions.

[0085] Compared with the prior art, this application has the following advantages:

[0086] 1. This application can conduct electromagnetic compatibility testing of high-voltage and high-current converter products for rolling stock in a laboratory darkroom, solving the coupling effect of external environmental radiation sources on the test during on-site testing.

[0087] 2. This application can implement electromagnetic compatibility testing of the converter with motor load and impedance load at different powers according to the actual vehicle operating conditions of the converter.

[0088] 3. This application can meet the on-load electromagnetic compatibility test of different types of converters such as locomotives, urban rail, and EMUs, including traction converters, auxiliary converters, and traction auxiliary converters.

[0089] 4. This application can meet the requirements of conducting electromagnetic compatibility tests in a darkroom for converters under different power supply modes. Different power supply modes may include single-phase power, alternating current, and direct current.

[0090] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "essentially consisting of..." describing a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps herein also contemplates an embodiment that is essentially composed of these elements, ingredients, parts or steps. By using the term "may", it is intended to illustrate that any attribute described that "may" include is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0091] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rolling stock converter electromagnetic compatibility test system, characterized in that: The locomotive vehicle converter electromagnetic compatibility test system comprises: The carrying mechanism includes an electromagnetic shielding mechanism capable of shielding external electromagnetic radiation, the electromagnetic shielding mechanism having a supporting turntable therein, the supporting turntable being used to carry the converter to be tested; the electromagnetic shielding mechanism includes an electromagnetic shielding body made of a shielding metal plate, the electromagnetic shielding body having an electromagnetic shielding door that can be opened and closed to enable the converter to be installed within the electromagnetic shielding body; Multiple cable interface units are provided inside the electromagnetic shielding mechanism, used for connecting cables outside the electromagnetic shielding mechanism to the converter to be tested, and the multiple cable interface units include current input interface boxes, current output interface boxes, and single-phase input interface boxes for multiple different current types; The cable pass-through mechanism comprises: a metal box body connected to the electromagnetic shielding mechanism, the metal box body having a threading hole for the cable to pass through; metal particles injected into the metal box body; the cable outside the electromagnetic shielding mechanism can pass through the threading hole to connect to the current input interface box and / or the current output interface box; A high-voltage power supply unit, which is used to convert the input electricity into single-phase electricity, AC electricity, or DC electricity for output, and can output the input electricity after voltage transformation; A power supply filter unit, configured to filter the current input cable from the high-voltage power supply unit to the current input interface box and the current output cable from the current output interface box to the high-voltage power supply unit, so as to remove high-frequency interference signals; The load system includes a motor load system and an impedance load system. The motor load system is used to simulate the operating load of a real locomotive vehicle. The impedance load system is used to provide an adjustable load and a resistance load. The electromagnetic compatibility test system is used to test the electromagnetic compatibility radiation characteristics or anti-interference characteristics of the converter to be tested when the converter is in operation.

2. The electromagnetic compatibility test system for locomotive and rolling stock converter according to claim 1, characterized in that: The cam is secured to the chassis and has a first end that is adapted to engage the guide rail and to engage the second end of the chassis, the first end of which is adapted to engage the second end of the chassis. A first cable is inserted into end A of the first chain and exits from end B of the first chain; a second cable is inserted into end C of the second chain and exits from end D of the first chain; The support turntable is fixedly connected to the slide rail, and multiple cable interface units are installed on the support turntable; one end of the first cable located at the B end of the first chain is connected to the current input interface box or the current output interface box, and one end of the second cable located at the D end of the second chain is connected to the current output interface box or the current input interface box; one end of the first cable located at the A end of the first chain can pass through the wire hole or can be connected to the power supply filter unit; one end of the second cable located at the C end of the second chain can pass through the wire hole or can be connected to the power supply filter unit.

3. The electromagnetic compatibility test system for locomotive and rolling stock converter according to claim 2, characterized in that: The high-voltage power supply unit includes a first power supply unit for converting three-phase power into single-phase power; a second power supply unit for transforming the alternating current; A third power supply unit for transforming direct current; a high-voltage line switching unit for achieving on-off switching.

4. The electromagnetic compatibility test system for a rolling stock converter according to claim 3, characterized in that: The locomotive vehicle converter electromagnetic compatibility test system has a first working mode; In the first working mode, the converter to be tested is mounted on the supporting turntable, and the input and output ends of the converter to be tested are respectively connected to the AC input interface box in the current input interface box and the AC output interface box in the current output interface box; the converter to be tested is a traction converter; The output end of the second power supply unit is connected to the high-voltage line adapter unit and then to one end of the first cable passing through the wire hole; the one end of the second cable passing through the wire hole is connected to the high-voltage line adapter unit and then to the motor load system.

5. The locomotive and rolling stock converter electromagnetic compatibility test system according to claim 4, characterized in that: The locomotive vehicle converter electromagnetic compatibility test system has a second working mode; In the second working mode, the converter to be tested is mounted on the supporting turntable, and the input and output ends of the converter to be tested are respectively connected to the DC input interface box in the current input interface box and the DC output interface box in the current output interface box; the converter to be tested is an auxiliary converter; The DC input interface box is connected to one of the power supply filter units via a fourth cable, and then connected to the third power supply unit via a high-voltage line adapter unit; the DC output interface box is connected to another of the power supply filter units via a third cable, and then the other of the power supply filter units is connected to another of the high-voltage line adapter units, and the high-voltage line adapter units are connected to the impedance load system; The fourth cable enters from end A of the first chain and exits from end B of the first chain. One end of the fourth cable located at end B of the first chain is connected to the DC input interface box.

6. The electromagnetic compatibility test system for a rolling stock converter according to claim 5, characterized in that: The locomotive vehicle converter electromagnetic compatibility test system has a third working mode; In the third working mode, the converter to be tested is mounted on the supporting turntable, and the input end of the converter to be tested is connected to the DC input interface box in the current input interface box, and the motor load output end of the converter to be tested is connected to the DC output interface box in the current output interface box; the auxiliary load output end of the converter to be tested is connected to the DC output interface box in the current output interface box, and the converter to be tested is a traction auxiliary converter; The output end of the second power supply unit is connected to one end of the first cable passing through the wire hole after passing through another high-voltage line adapter unit; one end of the second cable passing through the wire hole is connected to one high-voltage line adapter unit and then connected to the motor load system; after the DC output interface box is connected to the power supply filter unit through a third cable, the power supply filter unit is connected to another high-voltage line adapter unit, and the high-voltage line adapter unit is then connected to the impedance load system.

7. The electromagnetic compatibility test system for a rolling stock converter according to claim 5 or 6, characterized in that: The third cable passes through the C end of the second chain and exits from the D end of the first chain. One end of the third cable located at the D end of the second chain is connected to the DC output interface box.

8. The locomotive and rolling stock converter electromagnetic compatibility test system according to claim 6, characterized in that: The locomotive vehicle converter electromagnetic compatibility test system has a fourth working mode; In the fourth working mode, the converter to be tested is mounted on the supporting turntable, and the input end of the converter to be tested is connected to the single-phase input interface box in the current input interface box, the motor load output end of the converter to be tested is connected to the DC output interface box in the current output interface box; the auxiliary load output end of the converter to be tested is connected to the DC output interface box in the current output interface box, and the converter to be tested is an integrated converter; The output end of the first power supply unit is connected to one of the power supply filter units through another high-voltage line adapter unit, and then connected to the single-phase input interface box in the current input interface box; one end of the second cable passing through the wire hole is connected to one of the high-voltage line adapter units, and then connected to the motor load system; the DC output interface box is connected to another of the power supply filter units through a third cable, and then the power supply filter unit is connected to another of the high-voltage line adapter units, and the high-voltage line adapter unit is then connected to the impedance load system; The power supply filtering unit is connected to the single-phase input interface box in the current input interface box through a fourth cable. The fourth cable enters from the A end of the first chain and exits from the B end of the first chain. One end of the first cable of the fourth cable located at the B end of the first chain is connected to the single-phase input interface box.

9. A testing method using the rolling stock converter electromagnetic compatibility testing system as claimed in claim 8, characterized in that: The test method includes: Selecting corresponding operating modes for different types of converters to be tested, and connecting the rolling stock converter electromagnetic compatibility test system according to the electrical layout of the corresponding operating mode; Arrange the electromagnetic compatibility test system according to the RF radiation emission test and RF radiation immunity test standards; Start the power supply to power the rolling stock converter electromagnetic compatibility test system, turn on the high-voltage line switching unit, supply power according to the power supply requirements of the converter to be tested, and start the converter to be tested; The electromagnetic compatibility test system is used to test the electromagnetic compatibility radiation characteristics or anti-interference characteristics of the converter under different working conditions.

Images