High-power direct-current load device for testing

Abstract

The utility model discloses a high-power direct-current load device for testing. A plurality of fans and temperature sensors are fixed at the lower end of a lowermost transverse support frame; a row of a plurality of load resistors are respectively fixed on each row of transverse support frames on the upper side; the anode output end of the terminal strip is connected in series with the current transformer and then is connected with the anode input terminal of the device; the cathode input terminal of the device is connected with the cathode output end of the terminal strip; the voltage transformer is connected in parallel with the positive and negative input terminals of the device; the signal output end of the voltage transformer and the signal output end of the current transformer are connected to the signal input end of the electric quantity information display module. During use, after the load resistors are connected in series and in parallel through the connecting copper bars, the two ends of the equivalent resistor are connected to the positive input terminal and the negative input terminal of the device through the connecting copper bars. According to the utility model, the series-parallel mode of the load resistors and the number of the input resistors can be rapidly replaced, so that light load test, rated load test and overload test items of the urban rail transit rectifier unit can be conveniently and rapidly completed.

Description

Technical Field

[0001] The utility model belongs to the technical field of performance testing of rectifier units in urban rail transit power supply equipment, and relates to a high-power DC load device for testing rectifier units in urban rail transit. Background Art

[0002] With the rapid development of urbanization in my country, all large and medium-sized cities are faced with the problem of alleviating urban traffic pressure, protecting the environment, and reducing urban air and noise pollution. Therefore, vigorously developing urban rail transit has become an inevitable trend. The urban rail transit power supply system is the power source of urban rail transit electric locomotives, responsible for the supply and transmission of electric energy. In the existing mode, the system introduces power from the urban power grid along the rail transit line through the medium-voltage AC switchgear, and after converting it into DC power through the rectifier unit, it provides the required power for the traction power supply of the electric train. The rectifier unit adopts multi-pulse diode rectification technology. The rectifier transformer and two sets of rectifiers are connected in parallel to obtain an equivalent 24-pulse rectification device to provide electric locomotives. It is responsible for the important task of providing electric energy for electric vehicles. Its stable performance will be directly related to the safety and stability of the operation of the urban rail transit system. Therefore, the rectifier unit must be subjected to performance tests such as light load test, rated load test and overload test. Currently available high-power load cabinets are mostly used to test the power output and load capacity of various types of AC electrical equipment. Their applicability to DC power supply system testing is relatively weak. The simulated loads for the performance test of the rectifier unit are temporarily built by connecting multiple scattered resistors in series and parallel. There is no unified load device, and the reliability of connecting the scattered resistors in series and parallel is poor, resulting in poor stability of the resistance value of the simulated load and poor reliability of the test results. It is time-consuming, labor-intensive, and inefficient. A simulated load with a different resistance value needs to be replaced for each operating condition test at each voltage level, resulting in extremely low performance test efficiency. Utility Model Content

[0003] The purpose of the utility model is to solve the above-mentioned problems existing in the prior art and to provide a high-power DC load device for testing, which can quickly change the series and parallel mode of the load resistors and the number of resistors put into use, so as to meet the convenient and rapid completion of performance test items such as light load test, rated load test and overload test of urban rail transit rectifier units, and has high connection reliability and high performance test accuracy.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is: a high-power DC load device for testing, including a device bracket, a resistor array, a plurality of connecting copper bars, a monitoring and control system, a plurality of fans, a temperature sensor, a temperature controller and a terminal block; the device bracket includes vertical support plates on both sides and a plurality of rows of horizontal support frames fixed on the vertical support plates; a plurality of fans are evenly fixed at the lower end of the lowest horizontal support frame, and the temperature sensor is fixed on the lowest horizontal support frame; a row of a plurality of load resistors is respectively fixed on each row of the upper horizontal support frames, and each load resistor is arranged into a resistor array of multiple rows and columns; a positive columnar terminal and a negative columnar terminal are respectively arranged at the two ends of the upper end of each load resistor; positive and negative input terminals are arranged on the device; the monitoring and control system includes an electric quantity information acquisition module and an electric quantity information display module, and the electric quantity information acquisition module includes a voltage transformer and a current transformer; ... The quantity information acquisition module, the temperature controller and the terminal block are installed in the control box, and the control box is fixed on the device bracket; the positive output end of the terminal block is connected in series with the current transformer and then connected to the positive input terminal of the device, and the negative input terminal of the device is connected to the negative output end of the terminal block; the voltage transformer is connected in parallel to the positive and negative input terminals of the device; the signal output ends of the voltage transformer and the current transformer are respectively connected to the signal input end of the quantity information display module; when in use, after each load resistor is connected in series and parallel through the connecting copper bus according to the size of the required equivalent resistance, the two ends of the equivalent resistance are connected to the positive and negative input terminals of the device through the connecting copper bus; the power supplies of the temperature sensor and the temperature controller are respectively connected to an AC power output end of the terminal block, the signal output end of the temperature sensor is connected to the signal input end of the temperature controller, and the signal output end of the temperature controller is connected to the power supply of each fan.

[0005] Further preferably, when the performance test of the rectifier unit is carried out under the working condition of DC1500V voltage level, 8 test gears are set, and the cross support frame of the load device for fixing the load resistor has at least 4 rows or more, and each row has at least 10 or more load resistors; the first gear requires that the equivalent resistance of the load device is 6.8 ohms, and the test power is 331kW. The 10 load resistors in each of the 4 rows are connected in parallel by connecting the copper busbars to form a group of load resistors, and then the 4 groups of load resistors are connected in series by connecting the copper busbars; the second gear requires that the equivalent resistance of the load device is 8.5 ohms, and the test power is 265kW. The 8 load resistors in each of the 4 rows are connected in parallel by connecting the copper busbars to form a group of load resistors, and then the 4 groups of load resistors are connected in series by connecting the copper busbars; the third gear requires that the equivalent resistance of the load device is 11.3 ohms, and the test power is 199kW. The 6 load resistors in each of the 4 rows are connected in parallel by connecting the copper busbars to form a group of load resistors, and then the 4 The groups of load resistors are connected in series through connecting copper bars; the 4th gear requires that the equivalent resistance of the load device is 17 ohms and the test power is 132kW. The 4 load resistors in each of the 4 rows are connected in parallel through the connecting copper bars to form a group of load resistors, and then the 4 groups of load resistors are connected in series through the connecting copper bars; the 5th gear requires that the equivalent resistance of the load device is 34 ohms and the test power is 66kW. The 2 load resistors in each of the 4 rows are connected in parallel through the connecting copper bars to form a group of load resistors, and then the 4 groups of load resistors are connected in series through the connecting copper bars; the 6th gear requires that the equivalent resistance of the load device is 68 ohms and the test power is 33kW. The 4 load resistors are connected in series through the connecting copper bars; the 7th gear requires that the equivalent resistance of the load device is 136 ohms and the test power is 17kW. The 8th gear requires that the equivalent resistance of the load device is 170 ohms and the test power is 13kW. 10 load resistors are connected in series through the connecting copper bars.

[0006] Further preferably, when the performance test of the rectifier set is tested under the DC750V voltage level condition, 8 test gears are set, and the cross support frame of the load device for fixing the load resistor has at least 4 rows or more, and each row has at least 10 or more load resistors; the first gear requires that the equivalent resistance of the load device is 1.7 ohms, and the test power is 331kW. The 10 load resistors in each of the 4 rows are connected in parallel by connecting copper bars to form a group of load resistors, and then the upper two groups of load resistors and the lower two groups of load resistors are connected in parallel by connecting copper bars respectively, and the middle two groups of load resistors are connected in parallel. The resistance is connected in series by connecting copper bars; the second gear requires that the equivalent resistance of the load device is 2.13 ohms, and the test power is 265kW. The 8 load resistors in each of the 4 rows are connected in parallel by connecting copper bars to form a group of load resistors, and then the two groups of load resistors above and the two groups of load resistors below are connected in parallel by connecting copper bars respectively, and the two groups of load resistors in the middle are connected in series by connecting copper bars; the third gear requires that the equivalent resistance of the load device is 2.83 ohms, and the test power is 199kW. The 6 load resistors in each of the 4 rows are connected in parallel by connecting copper bars to form a group of load resistors, and then the upper two groups of load resistors and the lower two groups of load resistors are connected in parallel by connecting copper bars. The two groups of load resistors on the top and the two groups of load resistors below are connected in parallel through the connecting copper busbars, and the two groups of load resistors in the middle are connected in series through the connecting copper busbars; the 4th gear requires the equivalent resistance of the load device to be 4.25 ohms, the test power is 132kW, the 8 load resistors in each of the 2 rows are connected in parallel through the connecting copper busbars to form a group of load resistors, and then the two groups of load resistors are connected in series through the connecting copper busbars; the 5th gear requires the equivalent resistance of the load device to be 8.5 ohms, the test power is 66kW, the 4 load resistors in each of the 2 rows are connected in parallel through the connecting copper busbars to form a group of load resistors, and then The two groups of load resistors are connected in series through the connecting copper busbar; the 6th gear requires that the equivalent resistance of the load device is 17 ohms and the test power is 33kW. The two load resistors in each of the two rows are connected in parallel through the connecting copper busbar to form a group of load resistors, and then the two groups of load resistors are connected in series through the connecting copper busbar; the 7th gear requires that the equivalent resistance of the load device is 34 ohms and the test power is 17kW. The two load resistors are connected in series through the connecting copper busbar; the 8th gear requires that the equivalent resistance of the load device is 51 ohms and the test power is 13kW. The three load resistors are connected in series through the connecting copper busbar.

[0007] Further preferably, the device bracket is formed by welding angle steels, and vertical support plates on both sides thereof are provided with heat dissipation holes and are fixedly mounted with handrails.

[0008] Further preferably, universal wheels are installed on the four corners of the bottom surface of the vertical support plates on both sides of the device bracket to facilitate heat dissipation and overall movement of the device.

[0009] Further preferably, the power information display module is a multifunctional electronic meter, the load resistor adopts a high-power painted magnetic tube resistor; and the fan is an axial flow cooling fan.

[0010] The utility model can quickly change the series and parallel mode of the load resistors and the number of resistors put in, thereby changing the load value of the load device to facilitate and quickly complete performance test items such as light load test, rated load test and overload test of urban rail transit rectifier units, and has high connection reliability and high performance test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a main schematic diagram of the utility model;

[0012] Figure 2 It is a top view schematic diagram of the utility model;

[0013] Figure 3 It is a left side schematic diagram of the utility model;

[0014] Figure 4 It is a schematic diagram of the connection structure of the load resistor of the utility model when the test gear is in gear 1 during the performance test of the rectifier unit under the working condition of DC1500V voltage level;

[0015] Figure 5 It is a schematic diagram of the connection structure of the load resistor of the utility model when the test gear is in gear 2 during the performance test of the rectifier unit under the working condition of DC1500V voltage level;

[0016] Figure 6 It is a schematic diagram of the connection structure of the load resistor of the utility model when the test gear is in gear 3 during the performance test of the rectifier unit under the working condition of DC1500V voltage level;

[0017] Figure 7 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC1500V voltage level and the test gear is in gear 4;

[0018] Figure 8 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC1500V voltage level and the test gear is in gear 5;

[0019] Fig. 9 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC1500V voltage level and the test gear is in the 6th gear;

[0020] Fig.10It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC1500V voltage level and the test gear is at gear 7;

[0021] Fig.11 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC1500V voltage level and the test gear is at gear 8;

[0022] Fig.12 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC750V voltage level and the test gear is in gear 1;

[0023] Fig.13 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC750V voltage level and the test gear is in gear 2;

[0024] Fig.14 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC750V voltage level and the test gear is in gear 3;

[0025] Fig.15 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC750V voltage level and the test gear is in gear 4;

[0026] Fig.16 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC750V voltage level and the test gear is in gear 5;

[0027] Fig.17 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC750V voltage level and the test gear is in the 6th gear;

[0028] Fig.18 It is a schematic diagram of the connection structure of the load resistor of the utility model when the performance test of the rectifier unit is carried out under the working condition of DC750V voltage level and the test gear is in the 7th gear;

[0029] Fig.19 The present invention is a schematic diagram of the connection structure of the load resistor of the utility model when the test gear is at gear 8 during the performance test of the rectifier unit under the working condition of DC750V voltage level.

[0030] In the figure, 1 is a bracket, 2 is a load resistor, 3 is a fan, 4 is a control box, 5 is a heat dissipation hole, 6 is an armrest, 7 is a temperature sensor, 8 is a universal wheel, 11 is a vertical support plate, and 12 is a horizontal support frame. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with attached Figure 2 and specific implementation.

[0032] like Figures 1 to 19 As shown, the high-power DC load device for testing in this embodiment includes a device bracket 1, a resistor array, a plurality of connecting copper bars, a monitoring and control system, 3 (2, 4, 5, etc. can also be set as needed) fans 3, a temperature sensor 7, a temperature controller and a terminal row fixed on the device bracket 1. The device bracket 1 includes vertical support plates 11 on both sides and 6 rows of horizontal support frames 12 fixed on the vertical support plates 11. Three fans 3 are fixed at the lower end of the lowest horizontal support frame 12, and the temperature sensor 7 is fixed on the lowest horizontal support frame 12. A row of 10 (8, 9, 12, 14, etc. can also be set as needed) load resistors 2 are respectively fixed on the upper 5 rows of horizontal support frames 12, and each load resistor 2 is arranged in a resistor array of 5 rows and 10 columns (7 rows and 8 columns, 6 rows and 9 columns, 4 rows and 12 columns, 3 rows and 14 columns, etc. can also be set as needed). The two ends of the upper end of each load resistor 2 are respectively provided with a positive columnar terminal and a negative columnar terminal. Positive and negative input terminals are provided on the device. The monitoring and control system includes an electric quantity information acquisition module and an electric quantity information display module, and the electric quantity information acquisition module includes a voltage transformer and a current transformer. The positive output terminal of the terminal block is connected in series with the current transformer and then connected to the positive input terminal of the device, and the negative input terminal of the device is connected to the negative output terminal of the terminal block; the voltage transformer is connected in parallel to the positive and negative input terminals of the device. The electric quantity information display module is a multifunctional electronic instrument, and the signal output terminals of the voltage transformer and the current transformer are respectively connected to the signal input terminals of the multifunctional electronic instrument. When in use, after each load resistor 2 is connected in series and parallel by connecting the copper bar according to the size of the required equivalent resistance, the two ends of the equivalent resistance are connected to the positive and negative input terminals of the device by connecting the copper bar. The power supply of the temperature sensor 7 and the temperature controller is respectively connected to an AC power supply output terminal of the terminal block, the signal output terminal of the temperature sensor 7 is connected to the signal input terminal of the temperature controller, and the signal output terminal of the temperature controller is connected to the power supply of each fan 3. 4 is a control box fixed on the device bracket 12, in which a multifunctional electronic instrument, a temperature controller and a terminal block are installed.

[0033] In order to facilitate heat dissipation and overall movement of the device, the device bracket 1 of this embodiment is welded by angle steel, and heat dissipation holes 5 are opened on the vertical support plates 11 on both sides and handrails 6 are installed and fixed, and universal wheels 8 are installed on the four corners of the bottom surfaces of the vertical support plates 11 on both sides.

[0034] The load resistor of this embodiment adopts a high-power painted magnetic tube resistor; the fan is an axial flow cooling fan.

[0035] In this embodiment, when the performance test of the rectifier unit is conducted under the working condition of DC1500V voltage level, 8 test gears are set, and the cross support frame 12 of the load device fixing the load resistor 2 has 5 rows (or 4 rows, 6 rows, 7 rows, etc.), and each row has at least 10 (or 12, 14) load resistors 2. The first gear requires that the equivalent resistance of the load device is 6.8 ohms, the test power is 331kW, and the 10 load resistors 2 in each of the 4 rows are connected in parallel by connecting the copper bar to form a group of load resistors, and then the 4 groups of load resistors are connected in series by connecting the copper bar. The second gear requires that the equivalent resistance of the load device is 8.5 ohms, the test power is 265kW, and the 8 load resistors 2 in each of the 4 rows are connected in parallel by connecting the copper bar to form a group of load resistors, and then the 4 groups of load resistors are connected in series by connecting the copper bar. The third gear requires that the equivalent resistance of the load device is 11.3 ohms, the test power is 199kW, and the 6 load resistors 2 in each of the 4 rows are connected in parallel by connecting the copper busbar to form a group of load resistors, and then the 4 groups of load resistors are connected in series by connecting the copper busbar. The fourth gear requires that the equivalent resistance of the load device is 17 ohms, the test power is 132kW, and the 4 load resistors 2 in each of the 4 rows are connected in parallel by connecting the copper busbar to form a group of load resistors, and then the 4 groups of load resistors are connected in series by connecting the copper busbar. The fifth gear requires that the equivalent resistance of the load device is 34 ohms, the test power is 66kW, and the 2 load resistors 2 in each of the 4 rows are connected in parallel by connecting the copper busbar to form a group of load resistors, and then the 4 groups of load resistors are connected in series by connecting the copper busbar. The sixth gear requires that the equivalent resistance of the load device is 68 ohms, the test power is 33kW, and the 4 load resistors 2 are connected in series by connecting the copper busbar. The 7th gear requires that the equivalent resistance of the load device is 136 ohms, the test power is 17 kW, and 8 load resistors 2 are connected in series through the connecting copper busbar. The 8th gear requires that the equivalent resistance of the load device is 170 ohms, the test power is 13 kW, and 10 load resistors 2 are connected in series through the connecting copper busbar.

[0036] In this embodiment, when the performance test of the rectifier unit is tested under the DC750V voltage level working condition, the test gear is set to 8 gears, and the horizontal support frame 12 of the load device fixing the load resistor 2 has 5 rows (or 4 rows, 6 rows, 7 rows, etc.), and each row has at least 10 (or 12, 14) load resistors 2. The first gear requires that the equivalent resistance of the load device is 1.7 ohms, the test power is 331kW, and the 10 load resistors 2 in each of the 4 rows are connected in parallel by connecting copper bars to form a group of load resistors, and then the two groups of load resistors above and the two groups of load resistors below are connected in parallel by connecting copper bars, and the two groups of load resistors in the middle are connected in series by connecting copper bars. The second gear requires that the equivalent resistance of the load device is 2.13 ohms, the test power is 265kW, and the 8 load resistors 2 in each of the 4 rows are connected in parallel by connecting copper bars to form a group of load resistors, and then the two groups of load resistors above and the two groups of load resistors below are connected in parallel by connecting copper bars, and the two groups of load resistors in the middle are connected in series by connecting copper bars. The third gear requires that the equivalent resistance of the load device is 2.83 ohms, the test power is 199kW, the 6 load resistors 2 in each of the 4 rows are connected in parallel by connecting the copper busbar to form a group of load resistors, and then the two groups of load resistors above and the two groups of load resistors below are connected in parallel by connecting the copper busbars, and the two groups of load resistors in the middle are connected in series by connecting the copper busbars. The fourth gear requires that the equivalent resistance of the load device is 4.25 ohms, the test power is 132kW, the 8 load resistors 2 in each of the 2 rows are connected in parallel by connecting the copper busbars to form a group of load resistors, and then the two groups of load resistors are connected in series by connecting the copper busbars. The fifth gear requires that the equivalent resistance of the load device is 8.5 ohms, the test power is 66kW, the 4 load resistors 2 in each of the 2 rows are connected in parallel by connecting the copper busbars to form a group of load resistors, and then the two groups of load resistors are connected in series by connecting the copper busbars. The 6th gear requires that the equivalent resistance of the load device is 17 ohms, the test power is 33kW, and the two load resistors 2 in each row of 2 rows are connected in parallel through the connecting copper busbar to form a group of load resistors, and then the two groups of load resistors are connected in series through the connecting copper busbar. The 7th gear requires that the equivalent resistance of the load device is 34 ohms, the test power is 17kW, and the two load resistors 2 are connected in series through the connecting copper busbar. The 8th gear requires that the equivalent resistance of the load device is 51 ohms, the test power is 13kW, and the three load resistors 2 are connected in series through the connecting copper busbar.

[0037] The DC load device of this embodiment can quickly change the series and parallel mode of the load resistors and the number of resistors put into use, so as to meet the convenient and rapid completion of performance test items such as light load test, rated load test and overload test of the urban rail transit rectifier unit, and has high connection reliability and high performance test accuracy.

[0038] Of course, there are many other embodiments of the utility model. Without violating the spirit and essence of the utility model, technicians familiar with the field can make corresponding changes and deformations based on the utility model, but these corresponding changes and deformations should be regarded as improvements of equivalent technologies and belong to the scope of protection of the claims of the utility model.

Claims

1. A high-power DC load device for testing, characterized in that: The invention comprises a device support (1), a resistor array, a plurality of connecting copper bars, a monitoring and control system, a plurality of fans (3), a temperature sensor (7), a temperature controller and a terminal block; the device support (1) comprises two vertical support plates (11) and a plurality of rows of horizontal support frames (12) fixed on the vertical support plates (11); a plurality of fans (3) are evenly fixed at the lower end of the lowest horizontal support frame (12), and the temperature sensor (7) is fixed on the lowest horizontal support frame (12); a row of a plurality of load resistors (2) are respectively fixed on each row of the upper horizontal support frames (12), and each load resistor (2) is arranged in a resistor array of multiple rows and columns; a positive columnar terminal and a negative columnar terminal are respectively arranged at the two ends of the upper end of each load resistor (2); positive and negative input terminals are arranged on the device; the monitoring and control system comprises an electric quantity information acquisition module and an electric quantity information display module, and the electric quantity information acquisition module comprises a voltage transformer and a current transformer; the electric quantity information The acquisition module, the temperature controller and the terminal block are installed in a control box (4), and the control box (4) is fixed on the device bracket (1); the positive output end of the terminal block is connected in series with a current transformer and then connected to the positive input terminal of the device, and the negative input terminal of the device is connected to the negative output end of the terminal block; the voltage transformer is connected in parallel to the positive and negative input terminals of the device; the signal output ends of the voltage transformer and the current transformer are respectively connected to the signal input end of the power information display module; when in use, after each load resistor (2) is connected in series and parallel through a connecting copper bar according to the size of the required equivalent resistance, the two ends of the equivalent resistance are connected to the positive and negative input terminals of the device through the connecting copper bar; the power supply of the temperature sensor (7) and the temperature controller is respectively connected to an AC power output end of the terminal block, the signal output end of the temperature sensor (7) is connected to the signal input end of the temperature controller, and the signal output end of the temperature controller is connected to the power supply of each fan (3).

2. The high-power DC load device for testing according to claim 1, characterized in that: When the performance test of the rectifier unit is conducted under the condition of DC1500V voltage level, 8 test gears are set. The horizontal support frame (12) of the load device fixing the load resistor (2) has at least 4 rows or more, and each row has at least 10 or more load resistors (2); the first gear requires that the equivalent resistance of the load device is 6.8 ohms, and the test power is 331kW. The 10 load resistors (2) in each of the 4 rows are connected in parallel by connecting copper bars to form a group of load resistors, and then the 4 groups of load resistors are connected in parallel. The load resistors are connected in series by connecting the copper busbars; the second gear requires that the equivalent resistance of the load device is 8.5 ohms, the test power is 265kW, and the 8 load resistors (2) in each of the 4 rows are connected in parallel by connecting the copper busbars to form a group of load resistors, and then the 4 groups of load resistors are connected in series by connecting the copper busbars; the third gear requires that the equivalent resistance of the load device is 11.3 ohms, the test power is 199kW, and the 6 load resistors (2) in each of the 4 rows are connected in parallel by connecting the copper busbars to form a group of load resistors, and then the 4 groups of The load resistors are connected in series by connecting the copper busbars; the 4th gear requires that the equivalent resistance of the load device is 17 ohms, the test power is 132 kW, the 4 load resistors (2) in each of the 4 rows are connected in parallel by connecting the copper busbars to form a group of load resistors, and then the 4 groups of load resistors are connected in series by connecting the copper busbars; the 5th gear requires that the equivalent resistance of the load device is 34 ohms, the test power is 66 kW, the 2 load resistors (2) in each of the 4 rows are connected in parallel by connecting the copper busbars to form a group of load resistors, and then the 4 groups of load resistors are connected in series. The resistances are connected in series through the copper busbar; the 6th gear requires that the equivalent resistance of the load device is 68 ohms, the test power is 33 kW, and 4 load resistors (2) are connected in series through the copper busbar; the 7th gear requires that the equivalent resistance of the load device is 136 ohms, the test power is 17 kW, and 8 load resistors (2) are connected in series through the copper busbar; the 8th gear requires that the equivalent resistance of the load device is 170 ohms, the test power is 13 kW, and 10 load resistors (2) are connected in series through the copper busbar.

3. The high-power DC load device for testing according to claim 1, characterized in that: When the performance test of the rectifier unit is conducted under the DC750V voltage level condition, the test gear is set to 8 gears. The horizontal support frame (12) of the load device for fixing the load resistors (2) has at least 4 rows or more, and each row has at least 10 or more load resistors (2); the first gear requires that the equivalent resistance of the load device is 1.7 ohms, and the test power is 331kW. The 10 load resistors (2) in each of the 4 rows are connected in parallel by connecting copper bars to form a group of load resistors, and then the upper two groups of load resistors and the lower two groups of load resistors are connected in parallel by connecting copper bars respectively, and the middle two groups of load resistors are connected in parallel. The load resistors (2) in each row are connected in parallel by connecting the copper bars; the equivalent resistance of the load device is 2.13 ohms and the test power is 265 kW. The 8 load resistors (2) in each row of the 4 rows are connected in parallel by connecting the copper bars to form a group of load resistors. The upper two groups of load resistors and the lower two groups of load resistors are connected in parallel by connecting the copper bars respectively, and the middle two groups of load resistors are connected in series by connecting the copper bars; the equivalent resistance of the load device is 2.83 ohms and the test power is 199 kW. The 6 load resistors (2) in each row of the 4 rows are connected in parallel by connecting the copper bars to form a group of load resistors. The two groups of load resistors and the two groups of load resistors below are connected in parallel through the copper busbars, and the two groups of load resistors in the middle are connected in series through the copper busbars. The 4th gear requires that the equivalent resistance of the load device is 4.25 ohms, and the test power is 132kW. The 8 load resistors (2) in each of the 2 rows are connected in parallel through the copper busbars to form a group of load resistors, and then the two groups of load resistors are connected in series through the copper busbars. The 5th gear requires that the equivalent resistance of the load device is 8.5 ohms, and the test power is 66kW. The 4 load resistors (2) in each of the 2 rows are connected in parallel through the copper busbars to form a group of load resistors, and then the two groups The load resistors are connected in series via the connecting copper busbars; the 6th gear requires that the equivalent resistance of the load device is 17 ohms and the test power is 33 kW. The two load resistors (2) in each of the two rows are connected in parallel via the connecting copper busbars to form a group of load resistors, and then the two groups of load resistors are connected in series via the connecting copper busbars; the 7th gear requires that the equivalent resistance of the load device is 34 ohms and the test power is 17 kW. The two load resistors (2) are connected in series via the connecting copper busbars; the 8th gear requires that the equivalent resistance of the load device is 51 ohms and the test power is 13 kW. The three load resistors (2) are connected in series via the connecting copper busbars.

4. The high-power DC load device for testing according to claim 1, 2 or 3, characterized in that: The device bracket (1) is welded from angle steel, and both side vertical support plates (11) thereof are provided with heat dissipation holes and are fixedly provided with handrails (6).

5. The high-power DC load device for testing according to claim 4, characterized in that: Universal wheels (8) are installed on the four corners of the bottom surfaces of the vertical support plates (11) on both sides of the device bracket (1).

6. The high-power DC load device for testing according to claim 5, characterized in that: The power information display module is a multifunctional electronic instrument; the load resistor (2) adopts a high-power painted magnetic tube resistor; and the fan (3) is an axial flow cooling fan.

7. The high-power DC load device for testing according to claim 1, 2 or 3, characterized in that: Universal wheels (8) are installed on the four corners of the bottom surfaces of the vertical support plates (11) on both sides of the device bracket (1).

8. The high-power DC load device for testing according to claim 7, characterized in that: The power information display module is a multifunctional electronic instrument; the load resistor (2) adopts a high-power painted magnetic tube resistor; and the fan (3) is an axial flow cooling fan.

9. The high-power DC load device for testing according to claim 4, characterized in that: The power information display module is a multifunctional electronic instrument; the load resistor (2) adopts a high-power painted magnetic tube resistor; and the fan (3) is an axial flow cooling fan.

10. The high-power DC load device for testing according to claim 1, 2 or 3, characterized in that: The power information display module is a multifunctional electronic instrument; the load resistor (2) adopts a high-power painted magnetic tube resistor; and the fan (3) is an axial flow cooling fan.

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