An automatic function test system and method for a phase-crossing device

Abstract

The application provides an automatic through-phase device function test system and a test method, which comprise a first transformer, a second transformer and a simulation load, a three-phase primary winding of the first transformer is used for being connected with an external power supply, a secondary winding of the first transformer comprises a first connection terminal and a second connection terminal, the first connection terminal is connected with a primary winding of the second transformer through a first switch, the second connection terminal is connected with the primary winding of the second transformer through a second switch, and a secondary winding of the second transformer is connected with the simulation load; wherein when a power electronic switch group function test of an automatic through-phase device is carried out, the power electronic switch group of the automatic through-phase device is connected between the first connection terminal, the second connection terminal and the primary winding of the second transformer. Through the application, the power electronic switch group of the automatic through-phase device can be connected, so that the core function and operation effect of the automatic through-phase device can be tested.

Description

Technical Field

[0001] This invention relates to the field of automatic phase-splitting device functional testing technology, and particularly to an automatic phase-splitting device functional testing system and testing method. Background Technology

[0002] my country's current electrified railway traction network uses a single-phase 25kV traction power supply system. Electric locomotives powered by this network are single-phase loads. To reduce the negative sequence impact of single-phase loads on the three-phase power grid, the traction network employs segmented phase-switching power supply, resulting in phase separation within the network. Currently, there are three main types of automatic phase-switching mechanisms both domestically and internationally: automatic phase-switching via ground switches, automatic phase-switching via pole-mounted switches, and automatic phase-switching via vehicle-mounted switches. Among these, automatic phase-switching via ground switches can employ either mechanical or electronic switches. When developing an electronic switch-based automatic phase-switching device, it is urgent to propose a technical solution that can be used to test the operational effectiveness of the electronic switch-based automatic phase-switching device. Summary of the Invention

[0003] In view of this, one aspect of the present invention is to provide a functional testing system for an automatic phase-crossing device. This system allows access to the power electronic switch group of the automatic phase-crossing device, thereby testing the core functions and operational performance of the device. The present invention is achieved through the following technical means:

[0004] An automatic phase-crossing device functional testing system includes a first transformer, a second transformer, and a simulated load. The three-phase primary winding of the first transformer is used to connect to an external power source. The secondary winding of the first transformer includes a first terminal and a second terminal. The first terminal is connected to the primary winding of the second transformer via a first switch, and the second terminal is connected to the primary winding of the second transformer via a second switch. The secondary winding of the second transformer is connected to the simulated load. During the functional testing of the power electronic switch group of the automatic phase-crossing device, the power electronic switch group of the automatic phase-crossing device is connected between the first terminal, the second terminal, and the primary winding of the second transformer.

[0005] Furthermore, it also includes a soft-start transformer, which includes a primary winding, a secondary winding, and a soft-start winding. The primary winding of the soft-start transformer is connected to an external power source through a third switch, and the soft-start winding of the soft-start transformer is connected to a low-voltage power source through a fourth switch. The three-phase primary winding of the first transformer is connected to the secondary winding of the soft-start transformer through a fifth switch.

[0006] Furthermore, the first transformer is equipped with a soft-start winding, which is connected to an external power source via a sixth switch.

[0007] Furthermore, the low-voltage power supply is obtained by stepping down the external power supply.

[0008] Furthermore, the first transformer is a three-phase to two-phase transformer or a three-phase transformer.

[0009] Furthermore, when the first transformer is a three-phase to two-phase transformer, the first transformer adopts the Scott connection method or the VV connection method; when the first transformer is a three-phase transformer, the first terminal is set on any one phase of the secondary winding of the first transformer, and the second terminal is set on one of the other two phases of the secondary winding of the first transformer.

[0010] Furthermore, the simulated load is a capacitive load, an inductive load, or a resistive load.

[0011] A second aspect of the present invention is to provide a test method based on the above-described automatic phase-crossing device functional test system, wherein the automatic phase-crossing device includes a first power electronic switch group and a second power electronic switch group, one end of the first power electronic switch group is connected to one end of the first switch, the other end of the first power electronic switch group is simultaneously connected to one end of the second power electronic switch group and one end of the primary winding of the second transformer, and the other end of the second power electronic switch group is connected to one end of the second switch, wherein the test method is applied to a first control module and a second control module, including a forward driving test mode and a reverse driving test mode.

[0012] Furthermore, the forward driving test mode includes:

[0013] The first control module controls the first switch to close and the second switch to open.

[0014] After energizing the three-phase primary windings of the first transformer, the first control module sends a first signal to the second control module;

[0015] After receiving the first signal and after a first duration, the second control module controls the first power electronic switch group to turn on and sends the second signal to the first control module.

[0016] After receiving the second signal, the first control module controls the first switch to open and sends a third signal to the second control module.

[0017] After receiving the third signal and after a second time interval, the second control module controls the first power electronic switch group to turn off.

[0018] When the first conduction condition is met, the second control module controls the second power electronic switch group to conduct and sends a fourth signal to the first control module;

[0019] After receiving the fourth signal, the first control module controls the second switch to close and sends the fifth signal to the second control module.

[0020] After receiving the fourth signal and after a third time interval, the second control module controls the second power electronic switch group to turn off.

[0021] Furthermore, when the first conduction condition is met, the second control module controls the second power electronic switch group to conduct, including:

[0022] The second control module acquires the voltage information of the first and second terminals;

[0023] The second control module calculates the first voltage phase difference between the first terminal and the second terminal.

[0024] The second control module calculates the first turn-off phase angle of the first power electronic switch group based on the current information when the first power electronic switch group is turned off.

[0025] The second control module calculates the first conduction condition of the second power electronic switch group based on the first voltage phase difference and the first turn-off phase angle.

[0026] When the first conduction condition is met, the second control module controls the second power electronic switch group to conduct.

[0027] Furthermore, when the second control module controls the second power electronic switch group to turn on, the first control module and / or the second control module detect the inrush current of the second transformer.

[0028] Furthermore, the reverse driving test mode includes:

[0029] The first control module controls the second switch to close and the first switch to open.

[0030] After energizing the three-phase primary windings of the first transformer, the first control module sends a fifth signal to the second control module;

[0031] After receiving the fifth signal and after a fourth time interval, the second control module controls the first power electronic switch group to turn on and sends a sixth signal to the first control module.

[0032] After receiving the sixth signal, the first control module controls the second switch to open and sends the seventh signal to the second control module.

[0033] After receiving the sixth signal and after a fifth time interval, the second control module controls the second power electronic switch group to turn off.

[0034] When the second conduction condition is met, the second control module controls the first power electronic switch group to conduct and sends a seventh signal to the first control module;

[0035] After receiving the seventh signal, the first control module controls the first switch to close and sends the eighth signal to the second control module;

[0036] After receiving the eighth signal and after a sixth time interval, the second control module controls the first power electronic switch group to turn off.

[0037] Furthermore, the step of the second control module controlling the first power electronic switch group to conduct when the second conduction condition is met includes:

[0038] The second control module acquires the voltage information of the first and second terminals;

[0039] The second control module calculates the second voltage phase difference between the second terminal and the first terminal;

[0040] The second control module calculates the second turn-off phase angle of the second power electronic switch group based on the current information when the second power electronic switch group is turned off.

[0041] The second control module calculates the second conduction condition of the first power electronic switch group based on the second voltage phase difference and the second turn-off phase angle.

[0042] When the second conduction condition is met, the second control module controls the first power electronic switch group to conduct.

[0043] Furthermore, when the first power electronic switch group is turned on, the first control module and / or the second control module detect the inrush current of the second transformer.

[0044] Furthermore, energizing the three-phase primary windings of the first transformer includes: energizing the three-phase primary windings of the first transformer using a soft-start method.

[0045] Furthermore, the first control module is located in the controller of the automatic phase-crossing device functional test system, and the second control module is located in the controller of the automatic phase-crossing device.

[0046] Compared with the prior art, the beneficial effects of the present invention are:

[0047] 1. It can be connected to the power electronic switch group of the automatic phase-crossing device to test the core functions and operating effect of the automatic phase-crossing device;

[0048] 2. In the process of developing the electronic switch ground automatic phase crossing device, this invention can verify whether the electronic switch ground automatic phase crossing device has the function of suppressing the inrush current of the traction transformer during the commutation process.

[0049] 3. The present invention adopts a soft-start method, which can reduce the impact on the power electronic switch and extend the service life of the power electronic switch. Attached Figure Description

[0050] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention.

[0051] Figure 1 This is a schematic diagram of the structure of a first automatic phase-crossing device functional testing system provided according to an exemplary embodiment.

[0052] Figure 2 This is a schematic diagram of a second automatic phase-crossing device functional testing system provided according to an exemplary embodiment.

[0053] Figure 3 This is a schematic diagram of a third automatic phase-crossing device functional testing system provided according to an exemplary embodiment.

[0054] Figure 4 This is a schematic diagram of the structure of a fourth automatic phase-crossing device functional testing system provided according to an exemplary embodiment.

[0055] Figure 5 This is a schematic diagram of a fifth automatic phase-crossing device functional testing system provided according to an exemplary embodiment.

[0056] Figure 6 This is a schematic diagram of the structure of a sixth automatic phase-crossing device functional testing system provided according to an exemplary embodiment.

[0057] Figure 7 This is a flowchart of a forward driving test method according to an exemplary embodiment.

[0058] Figure 8 This is a flowchart of a reverse driving test method provided according to an exemplary embodiment. Detailed Implementation

[0059] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0060] Example 1

[0061] like Figure 1As shown, this embodiment provides an automatic phase-crossing device functional testing system, including a first transformer T1, a second transformer T2, and a simulated load Z. The three-phase primary winding of the first transformer T1 is used to connect to an external power supply P. The secondary winding of the first transformer T1 includes a first terminal a and a second terminal b. The first terminal a is connected to the primary winding of the second transformer T2 through a first switch K1, and the second terminal b is connected to the primary winding of the second transformer T2 through a second switch K2. The secondary winding of the second transformer T2 is connected to the simulated load Z. When performing functional testing of the power electronic switch group of the automatic phase-crossing device, the power electronic switch group of the automatic phase-crossing device is connected between the first terminal a, the second terminal b, and the primary winding of the second transformer T2.

[0062] Here, corresponding to the traction power supply system in engineering applications, in the automatic phase-crossing device functional test system provided in this embodiment, the first transformer T1 is equivalent to the traction transformer, the second transformer T2 is equivalent to the on-board transformer, and the simulated load Z is equivalent to the traction load (such as an electric locomotive). The first transformer T1 may include multiple secondary windings, and the first terminal a and the second terminal b may belong to two different secondary windings. The voltage phases output by the first terminal a and the second terminal b may be different. Then, the power electronic switch group of the automatic phase-crossing device and the second transformer T2 supply power to the simulated load Z through phase-by-phase switching, thereby enabling this embodiment to simulate the power supply system for electric locomotives in actual engineering projects using a non-phase traction power supply system. This not only tests the operating function of the power electronic switch group of the automatic phase-crossing device but also assesses whether the tested automatic phase-crossing device will cause excessive inrush current in the on-board transformer when put into actual use by detecting the inrush current of the second transformer T2. Furthermore, in this embodiment, how to reasonably add switching devices to the connection lines can be determined by those skilled in the art based on the actual situation, for example... Figure 2 This embodiment will not be described in detail.

[0063] As a preferred option, such as Figure 3 As shown, this embodiment may also include a soft-start transformer T0, which includes a primary winding, a secondary winding, and a soft-start winding. The primary winding of the soft-start transformer T0 is connected to an external power supply P through a third switch K3, and the soft-start winding of the soft-start transformer T0 is connected to a low-voltage power supply Q through a fourth switch K4. The three-phase primary winding of the first transformer T1 is connected to the secondary winding of the soft-start transformer T0 through a fifth switch K5.

[0064] As another preferred option, such as Figure 5As shown, the first transformer T1 in this embodiment can be equipped with a soft-start winding, and the soft-start winding of the first transformer T1 is connected to the low-voltage power supply Q through the sixth switch K6.

[0065] As a preferred option, such as Figure 4 and Figure 6 As shown, the low-voltage power supply Q in this embodiment can be obtained by stepping down the external power supply P.

[0066] Preferably, the first transformer T1 is a three-phase to two-phase transformer or a three-phase transformer.

[0067] Preferably, when the first transformer T1 is a three-phase to two-phase transformer, the first transformer T1 adopts the Scott connection method or the VV connection method; when the first transformer T1 is a three-phase transformer, the first terminal a is set in any one phase of the secondary winding of the first transformer T1, and the second terminal b is set in one of the other two phases of the secondary winding of the first transformer T1.

[0068] Preferably, the simulated load Z is a capacitive load, an inductive load, or a resistive load.

[0069] Example 2

[0070] This embodiment provides a test method based on the automatic phase-crossing device functional test system provided in Embodiment 1. The automatic phase-crossing device includes a first power electronic switch group J1 and a second power electronic switch group J2. One end of the first power electronic switch group J1 is connected to one end of a first switch K1, and the other end of the first power electronic switch group J1 is simultaneously connected to one end of the second power electronic switch group J2 and one end of the primary winding of the second transformer T2. The other end of the second power electronic switch group J2 is connected to one end of the second switch K2. The test method provided in this embodiment is applied to the first control module and the second control module, including a forward driving test mode and a reverse driving test mode.

[0071] It should be noted that in the automatic phase-crossing device, the first power electronic switch group J1 and the second power electronic switch group J2 are key components. When testing the function of the automatic phase-crossing device, the core is to test the operation of the first power electronic switch group J1 and the second power electronic switch group J2 and the impact on the inrush current during the switching process. The automatic phase-crossing device involved in this embodiment is existing technology. This embodiment mainly proposes a method for testing the function of the automatic phase-crossing device using the automatic phase-crossing device function testing system provided in Embodiment 1.

[0072] As a preferred option, such as Figure 7 As shown, the forward driving test mode in this embodiment includes:

[0073] S1: The first control module controls the first switch K1 to close and the second switch K2 to open;

[0074] S2: After energizing the three-phase primary winding of the first transformer T1, the first control module sends a first signal to the second control module; here, the content of the first signal includes that the three-phase primary winding of the first transformer T1 has been energized;

[0075] S3: After receiving the first signal and a first time interval has elapsed, the second control module controls the first power electronic switch group J1 to turn on and sends a second signal to the first control module. Here, the first time interval can be a first predetermined time interval. After receiving the first signal and a first predetermined time interval has elapsed, the second control module controls the first power electronic switch group J1 to turn on and sends a second signal to the first control module. Alternatively, the first time interval can also be determined by manual triggering. That is, after receiving the first signal and the first trigger signal (manually triggered and provided to the second control module), the second control module controls the first power electronic switch group J1 to turn on and sends a second signal to the first control module. In addition, the content of the second signal includes that the first power electronic switch group J1 has turned on.

[0076] S4: After receiving the second signal, the first control module controls the first switch K1 to open and sends a third signal to the second control module; here, the content of the third signal includes that the first switch K1 has been opened.

[0077] S5: After the second control module receives the third signal and a second time period has elapsed, it controls the first power electronic switch group J1 to turn off. Here, the second time period can be a second predetermined time period. After the second control module receives the third signal and a second predetermined time period has elapsed, it controls the first power electronic switch group J1 to turn off. Alternatively, the second time period can also be determined by manual triggering. That is, after the second control module receives the third signal and the second trigger signal (manual triggering provided to the second control module), it controls the first power electronic switch group J1 to turn off.

[0078] S6: When the first conduction condition is met, the second control module controls the second power electronic switch group J2 to conduct and sends a fourth signal to the first control module; here, the content of the fourth signal includes that the second power electronic switch group J2 has been conducted.

[0079] S7: After receiving the fourth signal, the first control module controls the second switch K2 to close and sends a fifth signal to the second control module; here, the content of the fifth signal includes that the second switch K2 has been closed.

[0080] S8: After receiving the fourth signal and a third time interval has elapsed, the second control module controls the second power electronic switch group J2 to turn off. Here, the third time interval can be a third predetermined time interval. After receiving the fourth signal and a third predetermined time interval has elapsed, the second control module controls the second power electronic switch group J2 to turn off. Alternatively, the third time interval can also be determined by manual triggering. That is, after receiving the fourth signal and the third trigger signal (manual triggering provided to the second control module), the second control module controls the second power electronic switch group J2 to turn off.

[0081] Specifically, step S6, where the second control module controls the second power electronic switch group J2 to conduct when the first conduction condition is met, includes:

[0082] S61: The second control module acquires the voltage information of the first terminal a and the second terminal b;

[0083] S62: The second control module calculates the first voltage phase difference between the first terminal a and the second terminal b;

[0084] S63: The second control module calculates the first turn-off phase angle of the first power electronic switch group J1 based on the current information when the first power electronic switch group J1 is turned off; here, the first turn-off phase angle may refer to the voltage phase angle corresponding to the zero-crossing turn-off of the first power electronic switch group J1.

[0085] S64: The second control module calculates the first conduction condition of the second power electronic switch group J2 based on the first voltage phase difference and the first turn-off phase angle. Here, the first conduction condition calculated can refer to the delay of a certain time after the first power electronic switch group J1 is turned off (such as a delay of 18ms, a delay of 16ms, etc., and generally the delay time is less than 20ms).

[0086] S65: When the first conduction condition is met, the second control module controls the second power electronic switch group J2 to conduct.

[0087] Preferably, when the second control module controls the second power electronic switch group J2 to conduct, the first control module and / or the second control module detect the inrush current of the second transformer T2. Here, the second transformer T2 is used to simulate the on-board transformer. If the inrush current of the second transformer T2 meets the requirements when the second power electronic switch group J2 is conducted, it means that when the automatic phase-crossing device under test is put into engineering application, the inrush current of the on-board transformer will also meet the requirements.

[0088] As a preferred option, such as Figure 8 As shown, the reverse driving test mode in this embodiment includes:

[0089] F1: The first control module controls the second switch K2 to close and the first switch K1 to open;

[0090] F2: After energizing the three-phase primary winding of the first transformer T1, the first control module sends a fifth signal to the second control module; here, the content of the fifth signal includes that the three-phase primary winding of the first transformer T1 has been energized;

[0091] F3: After receiving the fifth signal and after a fourth time interval, the second control module controls the second power electronic switch group J2 to turn on and sends a sixth signal to the first control module. Here, the fourth time interval can be a fourth predetermined time interval. After receiving the fifth signal and after a fourth predetermined time interval, the second control module controls the second power electronic switch group J2 to turn on and sends a sixth signal to the first control module. Alternatively, the fourth time interval can also be determined by manual triggering. That is, after receiving the fifth signal and the fourth trigger signal (manual triggering provided to the second control module), the second control module controls the second power electronic switch group J2 to turn on and sends a sixth signal to the first control module. In addition, the content of the sixth signal includes that the second power electronic switch group J2 has turned on.

[0092] F4: After receiving the sixth signal, the first control module controls the second switch K2 to open and sends a seventh signal to the second control module; here, the content of the seventh signal includes that the second switch K2 has been opened.

[0093] F5: After the second control module receives the sixth signal and a fifth time interval has elapsed, it controls the second power electronic switch group J2 to turn off. Here, the fifth time interval can be a fifth predetermined time interval. After the second control module receives the sixth signal and a fifth predetermined time interval has elapsed, it controls the second power electronic switch group J2 to turn off. Alternatively, the fifth time interval can also be determined by manual triggering. That is, after the second control module receives the sixth signal and a fifth trigger signal (manual triggering provided to the second control module), it controls the second power electronic switch group J2 to turn off.

[0094] F6: When the second conduction condition is met, the second control module controls the first power electronic switch group J1 to conduct and sends a seventh signal to the first control module; here, the content of the seventh signal includes that the first power electronic switch group J1 has been conducted.

[0095] F7: After receiving the seventh signal, the first control module controls the first switch K1 to close and sends the eighth signal to the second control module; here, the content of the eighth signal includes that the first switch K1 has been closed.

[0096] F8: After the second control module receives the eighth signal and a sixth time interval has elapsed, it controls the first power electronic switch group (J1) to turn off. Here, the sixth time interval can be a sixth predetermined time interval. After the second control module receives the eighth signal and a sixth predetermined time interval has elapsed, it controls the first power electronic switch group J1 to turn off. Alternatively, the sixth time interval can also be determined by manual triggering. That is, after the second control module receives the eighth signal and the sixth trigger signal (manual trigger provided to the second control module), it controls the first power electronic switch group J1 to turn off.

[0097] Specifically, step F6, where the second control module controls the first power electronic switch group J1 to conduct when the second conduction condition is met, includes:

[0098] F61: The second control module acquires the voltage information of the first terminal a and the second terminal b;

[0099] F62: The second control module calculates the second voltage phase difference between the second terminal b and the first terminal a;

[0100] F63: The second control module calculates the second turn-off phase angle of the second power electronic switch group J2 based on the current information when the second power electronic switch group J2 is turned off; here, the second turn-off phase angle can refer to the voltage phase angle corresponding to the zero-crossing turn-off of the second power electronic switch group J2.

[0101] F64: The second control module calculates the second conduction condition of the first power electronic switch group J1 based on the second voltage phase difference and the second turn-off phase angle. Here, the calculated second conduction condition can refer to the delay of a certain time after the second power electronic switch group J2 is turned off (such as a delay of 18ms, a delay of 16ms, etc., and generally the delay time is less than 20ms).

[0102] F65: When the second conduction condition is met, the second control module controls the first power electronic switch group J1 to conduct.

[0103] Preferably, when the second control module controls the first power electronic switch group J1 to turn on, the first control module and / or the second control module detect the inrush current of the second transformer T2.

[0104] Preferably, the method for energizing the three-phase primary winding of the first transformer T1 in this embodiment may include: energizing the three-phase primary winding of the first transformer T1 using a soft-start method.

[0105] Preferably, the first control module is located in the controller of the automatic phase-crossing device functional testing system, and the second control module is located in the controller of the automatic phase-crossing device. In actual engineering, the first control module and the second control module can be integrated into the same control system. As long as the control system includes the functions of the first control module and the second control module provided in this embodiment, it also falls within the protection scope of this invention.

[0106] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be considered as limitations on the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A test method for an automatic phase-crossing device functional test system, characterized in that, The automatic phase-crossing device functional testing system includes a first transformer (T1), a second transformer (T2), and a simulated load (Z). The three-phase primary winding of the first transformer (T1) is used to connect to an external power source (P). The secondary winding of the first transformer (T1) includes a first terminal (a) and a second terminal (b). The first terminal (a) is connected to the primary winding of the second transformer (T2) through a first switch (K1), and the second terminal (b) is connected to the primary winding of the second transformer (T2) through a second switch (K2). The secondary winding of the second transformer (T2) is connected to the simulated load (Z). When performing functional testing of the power electronic switch group of the automatic phase-crossing device, the power electronic switch group of the automatic phase-crossing device is connected between the first terminal (a), the second terminal (b), and the primary winding of the second transformer (T2). The automatic phase-crossing device includes a first power electronic switch group (J1) and a second power electronic switch group (J2). One end of the first power electronic switch group (J1) is connected to one end of the first switch (K1), and the other end of the first power electronic switch group (J1) is simultaneously connected to one end of the second power electronic switch group (J2) and one end of the primary winding of the second transformer (T2). The other end of the second power electronic switch group (J2) is connected to one end of the second switch (K2). The test method is applied to the first control module and the second control module, including a forward driving test mode and a reverse driving test mode. The forward driving test mode includes: The first control module controls the first switch (K1) to close and the second switch (K2) to open; After energizing the three-phase primary winding of the first transformer (T1), the first control module sends a first signal to the second control module; After receiving the first signal and after a first time period, the second control module controls the first power electronic switch group (J1) to turn on and sends the second signal to the first control module. After receiving the second signal, the first control module controls the first switch (K1) to open and sends a third signal to the second control module; After receiving the third signal and after a second time interval, the second control module controls the first power electronic switch group (J1) to turn off. When the first conduction condition is met, the second control module controls the second power electronic switch group (J2) to conduct and sends a fourth signal to the first control module; After receiving the fourth signal, the first control module controls the second switch (K2) to close and sends the fifth signal to the second control module; After receiving the fourth signal and after a third time interval, the second control module controls the second power electronic switch group (J2) to turn off.

2. The test method according to claim 1, characterized in that, When the first conduction condition is met, the second control module controls the second power electronic switch group (J2) to conduct, including: The second control module acquires the voltage information of the first terminal (a) and the second terminal (b); The second control module calculates the first voltage phase difference between the first terminal (a) and the second terminal (b); The second control module calculates the first turn-off phase angle of the first power electronic switch group (J1) based on the current information when the first power electronic switch group (J1) is turned off. The second control module calculates the first conduction condition of the second power electronic switch group (J2) based on the first voltage phase difference and the first turn-off phase angle. When the first conduction condition is met, the second control module controls the second power electronic switch group (J2) to conduct.

3. The test method according to claim 1, characterized in that, When the second control module controls the second power electronic switch group (J2) to be turned on, the first control module and / or the second control module detect the inrush current of the second transformer (T2).

4. The test method according to claim 1, characterized in that, The reverse driving test mode includes: The first control module controls the second switch (K2) to close and the first switch (K1) to open; After energizing the three-phase primary winding of the first transformer (T1), the first control module sends a fifth signal to the second control module; After receiving the fifth signal and after a fourth time interval, the second control module controls the first power electronic switch group (J1) to turn on and sends the sixth signal to the first control module. After receiving the sixth signal, the first control module controls the second switch (K2) to open and sends the seventh signal to the second control module; After receiving the sixth signal and after a fifth time interval, the second control module controls the second power electronic switch group (J2) to turn off. When the second conduction condition is met, the second control module controls the first power electronic switch group (J1) to conduct and sends a seventh signal to the first control module; After receiving the seventh signal, the first control module controls the first switch (K1) to close and sends the eighth signal to the second control module; After receiving the eighth signal and after a six-hour period, the second control module controls the first power electronic switch group (J1) to turn off.

5. The test method according to claim 4, characterized in that, The second control module controlling the first power electronic switch group (J1) to conduct when the second conduction condition is met includes: The second control module acquires the voltage information of the first terminal (a) and the second terminal (b); The second control module calculates the second voltage phase difference between the second terminal (b) and the first terminal (a); The second control module calculates the second turn-off phase angle of the second power electronic switch group (J2) based on the current information when the second power electronic switch group (J2) is turned off; The second control module calculates the second conduction condition of the first power electronic switch group (J1) based on the second voltage phase difference and the second turn-off phase angle. When the second conduction condition is met, the second control module controls the first power electronic switch group (J1) to conduct.

6. The test method according to claim 4, characterized in that, When the first power electronic switch group (J1) is turned on, the first control module and / or the second control module detect the inrush current of the second transformer (T2).

7. The test method according to any one of claims 1-6, characterized in that, The energizing of the three-phase primary winding of the first transformer (T1) includes: energizing the three-phase primary winding of the first transformer (T1) using a soft-start method.

8. The test method according to any one of claims 1-6, characterized in that, The first control module is located in the controller of the automatic phase-splitting device functional test system, and the second control module is located in the controller of the automatic phase-splitting device.

9. The test method according to claim 1, characterized in that, The automatic phase-crossing device functional test system also includes a soft-start transformer (T0), which includes a primary winding, a secondary winding, and a soft-start winding. The primary winding of the soft-start transformer (T0) is connected to an external power supply (P) through a third switch (K3), and the soft-start winding of the soft-start transformer (T0) is connected to a low-voltage power supply (Q) through a fourth switch (K4). The three-phase primary winding of the first transformer (T1) is connected to the secondary winding of the soft-start transformer (T0) through a fifth switch (K5).

10. The test method according to claim 1, characterized in that, The first transformer (T1) is equipped with a soft-start winding, and the soft-start winding of the first transformer (T1) is connected to an external power supply (P) through a sixth switch (K6).

11. The test method according to claim 9 or 10, characterized in that, The low-voltage power supply (Q) is obtained by stepping down the external power supply (P).

12. The test method according to claim 1, characterized in that, The first transformer (T1) is a three-phase to two-phase transformer or a three-phase transformer.

13. The test method according to claim 12, characterized in that, When the first transformer (T1) is a three-phase to two-phase transformer, the first transformer (T1) adopts the Scott connection method or the VV connection method; when the first transformer (T1) is a three-phase transformer, the first terminal (a) is set on any one phase of the secondary winding of the first transformer (T1), and the second terminal (b) is set on one of the other two phases of the secondary winding of the first transformer (T1).

14. The test method according to claim 1, characterized in that, The simulated load (Z) is a capacitive load, an inductive load, or a resistive load.

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