A detection device and method for a three-phase current unbalanced regulating device

Abstract

The present invention provides a detection device and method for a three-phase current imbalance regulating device. The detection device includes an incoming line, a first air circuit breaker, a current transformer, a busbar, an independent load module, and a load adjustment module. The first air circuit breaker is arranged on the incoming line and is connected to the busbar via a current transformer. The independent load module and the load adjustment module are respectively connected to the busbar. The present invention adopts two load topologies: an independent load module and a load adjustment module. The load adjustment module is not adjustable. For quick inspection, the independent load module can be adjusted only by a button. It can simultaneously detect multiple phase-changing switches in the three-phase current imbalance regulating device, and the detection efficiency is high. In addition, the present invention simulates the complex working conditions of the three-phase imbalance in the distribution network substation, reduces the load power of the simulated distribution network substation, amplifies the detected current through software, and easily verifies the adjustment capability of the three-phase current imbalance regulating device.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution networks, and in particular to a detection device and method for a three-phase current imbalance regulating device. Background Art

[0002] In recent years, power grid systems have placed increasing demands on distribution networks, particularly in 380V distribution substations. Because the user side of these systems is primarily single-phase load-carrying and power consumption is inconsistent, three-phase imbalance is a common problem, with power quality issues often exceeding standards. Three-phase imbalance is crucial for the long-term stable operation of distribution substations and a prerequisite for stable transformer operation. The root cause of this problem is current imbalance within the transformers within the distribution substations. The current three-phase current unbalance regulation devices include the following three types: 1) Phase-to-phase capacitor type, which is placed on the secondary side of the substation transformer and achieves a balanced current on the primary side of the substation transformer through the input of phase-to-phase and phase-zero capacitors; 2) SVG type, which is placed on the secondary side of the substation transformer and achieves a balanced current on the primary side of the substation transformer through three-phase active power regulation; 3) Phase-changing switch type, which is a thyristor parallel switch. This device is placed on the terminal load side of the distribution station and balances the distribution station transformer by adjusting the power supply phase of the terminal load.

[0003] Currently, three-phase current imbalance regulators are widely used in the field of "low voltage" management in distribution networks. In China, the number of manufacturers of three-phase current imbalance regulators is gradually increasing, and product output is increasing. Rapid factory inspection of three-phase current imbalance regulators is particularly important, especially for phase-changing switch-type three-phase imbalance regulators. A set of devices itself includes nine phase-changing switches according to the basic configuration. If mass-produced, it will bring a considerable workload for factory inspection, slowing down work efficiency. The detection device of the existing three-phase current imbalance regulator is aimed at testing a single phase-changing switch and a single controller, including verifying whether the phase-changing switch can operate correctly, the sampling data status, and communication performance, and the sampling data and communication performance of the controller. Its detection method still requires professionals with certain technical capabilities to detect. In other words, the detection method has limitations. There is a lack of detection devices for batch testing of multiple phase-changing switches in the three-phase current imbalance regulator, resulting in low detection efficiency. Summary of the Invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art in which the detection means have limitations and low detection efficiency, the present invention provides a detection device and method for a three-phase current imbalance regulation device. The detection device includes an incoming line, a first air circuit breaker, a current transformer, a busbar, an independent load module and a load adjustment module. The detection method adjusts the independent load module based on the three-phase current imbalance degree of the three-phase current imbalance regulation device in an initial state, thereby realizing batch detection of multiple phase-changing switches in the three-phase current imbalance regulation device, and having high detection efficiency.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a detection device for a three-phase current unbalance adjustment device, the three-phase current unbalance adjustment device comprising a controller and M phase-changing switches; the detection device comprising an incoming line, a first air circuit breaker, a current transformer, a busbar, an independent load module, and a load adjustment module;

[0007] The first air circuit breaker is arranged on the incoming line, and the three-phase voltage and neutral line on its output side are connected to the voltage incoming line of the controller, and it is connected to the busbar through a current transformer. The independent load module and the regulated load module are respectively connected to the busbar.

[0008] The primary side of the current transformer is connected to the first air circuit breaker, and the secondary side of the current transformer is connected to the current input line of the controller.

[0009] The independent load module includes a second air circuit breaker, N relay units and N load groups;

[0010] The input end of the second air circuit breaker is connected to the busbar, the input ends of the N relay units are all connected to the output end of the second air circuit breaker, and their output ends are respectively connected to the input ends of N load groups, and the output ends of the N load groups are all connected to the neutral line.

[0011] The relay unit includes three relays, and the three relays are respectively connected to different phases.

[0012] Each relay unit output terminal in the independent load module is connected to a corresponding load group, each load group includes a different number of loads, and the loads in each load group are connected in parallel through the transfer terminal.

[0013] The first load group connected to the output end of the first relay unit in the independent load module includes one load, the second load group connected to the output end of the second relay unit includes two parallel loads, and so on. The Nth load group connected to the output end of the Nth relay unit includes N parallel loads.

[0014] The load adjustment module includes M air relays and M load units;

[0015] The input ends of the M air relays are connected to the busbar, and the output ends are respectively connected to one end of the first test line through the adapter terminal. The input ends of the M phase-changing switches are connected to the other end of the first test line through different alligator clips, and the output ends are connected to one end of the second test line through different alligator clips. The other end of the second test line is connected to the input ends of the M load units through the adapter terminal, and the output ends of the M load units are all connected to the neutral line.

[0016] The output end of the phase-changing switch is correspondingly connected to a load group, each load group includes a different number of loads, and the loads in each load group are connected in parallel via a transfer terminal.

[0017] The first load unit connected to the output end of the first phase-changing switch among the M phase-changing switches includes one load, the second load unit connected to the output end of the second phase-changing switch includes two loads, the third load unit connected to the output end of the third phase-changing switch includes three loads, and so on. The Mth load unit connected to the output end of the Mth phase-changing switch includes M loads.

[0018] On the other hand, the present invention further provides a detection method for a three-phase current imbalance adjustment device, which is implemented based on the above-mentioned detection device. The detection method includes:

[0019] Calculate the three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state;

[0020] Based on the three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state, the three-phase current imbalance regulating device operates until the three-phase current of the three-phase current imbalance regulating device reaches balance, and records the number and operation state of the operated phase-changing switch;

[0021] Based on the recorded number and operation status of the action phase-changing switch, the phases of the relays in the independent load module are adjusted, and at the same time, the three-phase current imbalance adjustment device is operated until the three-phase current of the three-phase current imbalance adjustment device reaches a balance, and the number and operation status of the action phase-changing switch are recorded;

[0022] Repeatedly adjust the phases of each relay in the independent load module until the three phases of the M groups of phase-changing switches are operating normally.

[0023] The three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state is calculated as follows:

[0024]

[0025] Wherein, Δ represents the three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state; I MAXIndicates the maximum three-phase current of the three-phase current unbalance adjustment device, I MIN Indicates the minimum three-phase current of the three-phase current unbalance adjustment device.

[0026] Compared with the closest existing technology, the technical solution provided by the present invention has the following beneficial effects:

[0027] The present invention provides a detection device including an incoming line, a first air circuit breaker, a current transformer, a busbar, an independent load module, and a load adjustment module. The first air circuit breaker is arranged on the incoming line, and the three-phase voltage and the neutral line on the output side of the first air circuit breaker are connected to the voltage incoming line of the controller. The first air circuit breaker is connected to the busbar via a current transformer. The independent load module and the load adjustment module are respectively connected to the busbar. The device can simultaneously detect multiple phase-changing switches in a three-phase current imbalance adjustment device, thereby improving detection efficiency.

[0028] The detection device provided by the present invention adopts two load topologies: an independent load module and an adjustable load module. The adjustable load module is not adjustable. For quick testing, the independent load module can be adjusted by just pressing a button, thereby achieving the purpose of testing the three-phase current imbalance adjustment device.

[0029] The detection device provided by the present invention adopts a flexible load configuration method. Different loads in the independent load module and the adjustable load module are connected through short-circuit wires of the transfer terminal and can be quickly plugged in and out. On the phase-changing switch side, alligator clips can also be used to quickly connect the input / output end of the phase-changing switch, saving time in screwing and unscrewing.

[0030] The detection device provided by the present invention simulates the complex three-phase unbalanced working conditions of the distribution network substation, reduces the load power of the simulated distribution network substation, amplifies the detected current through software, and easily verifies the adjustment capability of the three-phase current imbalance adjustment device;

[0031] In the detection method of the three-phase current imbalance regulation device provided by the present invention, the three-phase current imbalance degree of the three-phase current imbalance regulation device in the initial state is first calculated, and then based on the three-phase current imbalance degree of the three-phase current imbalance regulation device in the initial state, the three-phase current imbalance regulation device is actuated until the three-phase current of the three-phase current imbalance regulation device reaches a balance, and the number and the action state of the actuated phase-changing switch are recorded; then, based on the recorded number and the action state of the actuated phase-changing switch, the phase difference of each relay in the independent load module is adjusted, and the three-phase current imbalance regulation device is actuated at the same time until the three-phase current of the three-phase current imbalance regulation device reaches a balance, and the number and the action state of the actuated phase-changing switch are recorded; finally, the phase difference of each relay in the independent load module is repeatedly adjusted until the three phases of all the phase-changing switches operate normally. The detection method has low requirements for technical personnel, and multiple phase-changing switches in the three-phase current imbalance regulation device can be batch detected, with high detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural diagram of a detection device for a three-phase current imbalance regulating device in Example 1 of the present invention;

[0033] Figure 2 is a structural diagram of a phase-changing switch in embodiment 1 of the present invention;

[0034] Figure 3 is a flow chart of a detection method for a three-phase current imbalance regulating device in embodiment 1 of the present invention;

[0035] Figure 4 It is a structural diagram of the detection device of the three-phase current imbalance regulation device in Example 2 of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be described in further detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] Embodiment 1 of the present invention provides a detection device for a three-phase current imbalance adjustment device, wherein the three-phase current imbalance adjustment device includes a controller and M phase-changing switches ( Figure 1 KD1 to KDM in the embodiment of the present invention; the detection device structure diagram of the three-phase current imbalance adjustment device is as shown in FIG. Figure 1 As shown, Figure 1 In the figure, KK1 represents the first air circuit breaker, KK2 represents the second air circuit breaker in the independent load module, K1A, K1B and K1C are the three-phase relays of the first relay unit in the independent load module, K2A, K2B and K2C are the three-phase relays of the second relay unit in the independent load module, and so on; K1 to KM are the M air circuit breakers in the load regulating module, R represents the load, and CT1 represents the current transformer set between the first air circuit breaker and the busbar. KD1 to KDM are M phase-changing switches, and the specific structure of the phase-changing switches is as follows: Figure 2 As shown, Figure 2 In the figure, VTa, VTb, and VTc are thyristor groups (two thyristors are connected in anti-parallel), KMA, KMB, and KMC are switches, and CT2 is a current transformer.

[0039] The detection device of the three-phase current imbalance adjustment device provided in Example 1 of the present invention includes an incoming line, a first air circuit breaker, a current transformer, a busbar, an independent load module and a load adjustment module; the first air circuit breaker is arranged on the incoming line, the three-phase voltage and the neutral line on the output side of the first air circuit breaker are connected to the voltage incoming line of the controller, and the first air circuit breaker is connected to the busbar through the current transformer, and the independent load module and the load adjustment module are respectively connected to the busbar.

[0040] The primary side of the current transformer is connected to the first air circuit breaker, and the secondary side of the current transformer is connected to the current input line of the controller.

[0041] The above-mentioned independent load module includes a second air circuit breaker, N relay units and N load groups;

[0042] The input end of the second air circuit breaker is connected to the busbar, the input ends of the N relay units are connected to the output end of the second air circuit breaker, and their output ends are respectively connected to the input ends of the N load groups, and the output ends of the N load groups are all connected to the neutral line.

[0043] Each relay unit consists of three relays, which are connected to different phases. Figure 1 As shown in the figure, the three relays in the first relay unit are K1A, K1B, and K1C, the three relays in the second relay unit are K2A, K2B, and K2C, and so on. The three relays in the Nth relay unit are KNA, KNB, and KNC. Replace the first load in each load unit in the load adjustment module with a light. It is more intuitive to see whether the light dims during the load power-on and phase change process. Figure 1 D1 to DM (D1 to DM are light bulbs).

[0044] Each relay unit output terminal in an independent load module is connected to a corresponding load group. Each load group includes a different number of loads, and the loads in each load group are connected in parallel via a transfer terminal. Specifically, the first load group connected to the first relay unit output terminal in the independent load module includes one load, the second load group connected to the second relay unit output terminal includes two loads connected in parallel, and so on. The Nth load group connected to the Nth relay unit output terminal includes N loads connected in parallel.

[0045] The above-mentioned load regulation module includes M air relays and M load units; the input ends of the M air relays are connected to the busbar, and the output ends are respectively connected to one end of the first test line through the adapter terminal, the input ends of the M phase-changing switches are connected to the other end of the first test line through different alligator clips, the output ends of the M phase-changing switches are connected to one end of the second test line through different alligator clips, the other end of the second test line is connected to the input ends of the M load units through the adapter terminal, and the output ends of the M load units are all connected to the neutral line.

[0046] The output ends of the aforementioned phase-changing switches are connected to corresponding load groups. Each load group includes a different number of loads, and the loads in each load group are connected in parallel via transfer terminals. Specifically, the first load unit connected to the output end of the first phase-changing switch among the M phase-changing switches includes one load, the second load unit connected to the output end of the second phase-changing switch includes two loads, the third load unit connected to the output end of the third phase-changing switch includes three loads, and so on. The Mth load unit connected to the output end of the Mth phase-changing switch includes M loads.

[0047] Embodiment 1 of the present invention further provides a detection method for a three-phase current imbalance adjustment device. Based on the above-mentioned detection device, the specific process of the detection method for a three-phase current imbalance adjustment device provided in Embodiment 1 of the present invention is as follows:

[0048] S101: Calculating the three-phase current imbalance degree of the three-phase current imbalance regulating device in an initial state;

[0049] S102: Based on the three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state calculated in S101, the three-phase current imbalance regulating device is actuated, and the phase-changing switches are switched until the three-phase currents of the three-phase current imbalance regulating device are balanced, and the number and operation state of the actuated phase-changing switches are recorded;

[0050] S103: Based on the recorded numbers and operating states of the actuated phase-changing switches, the phases of the relays in the independent load module are adjusted. For example, q (1≤q≤N) loads are switched from the current phase to other phases. The loads of the phase-changing switches under the three-phase unbalance adjustment device are distributed according to the state in step 1. If the imbalance changes, the three-phase current unbalance adjustment device is activated, and the phase-changing switches start to commutate until the three-phase currents of the three-phase current unbalance adjustment device reach a balance. The numbers and operating states of the actuated phase-changing switches are recorded.

[0051] S104: Repeat adjusting the phase of each relay in the independent load module (ie, repeatedly executing S103) until the three phases of the M groups of phase-changing switches operate normally.

[0052] set up Assume that the load groups in the independent load module are initially arranged such that groups 1 to x are in phase A, groups (x+1) to 2x are in phase B, and groups (2x+1) to N are in phase C. Referring to the independent load module, the load module is adjusted so that groups 1 to y are in phase A, groups (y+1) to 2y are in phase B, and groups (2y+1) to M are in phase C. Therefore, in the above S101, the three-phase current imbalance degree of the three-phase current imbalance adjustment device in the initial state is calculated as follows:

[0053]

[0054] Wherein, Δ represents the three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state; I MAX Indicates the maximum three-phase current of the three-phase current unbalance adjustment device, I MIN Indicates the minimum three-phase current value of the three-phase current unbalance adjustment device. The positions of each load phase and their unbalance degree in the initial state are shown in Table 1:

[0055] Table 1

[0056]

[0057]

[0058] Example 2

[0059] The structure diagram of the detection device of the three-phase current imbalance adjustment device provided by Example 2 of the present invention is as follows Figure 4 As shown, there are 9 phase-changing switches in the three-phase current unbalance regulation device ( Figure 4 The independent load module is equipped with 5 load groups and 5 relay units, and the regulating load module is equipped with 9 air circuit breakers ( Figure 4 K1 to K9 in the independent load module) and 9 load units; KK1 represents the first air circuit breaker, KK2 represents the second air circuit breaker in the independent load module, K1A, K1B and K1C are respectively the three-phase relays of the first relay unit in the independent load module, K2A, K2B and K2C are respectively the three-phase relays of the second relay unit in the independent load module, and so on, K5A, K5B and K5C are respectively the three-phase relays of the fifth relay unit in the independent load module; R represents the load. Considering energy saving and consumption reduction, the power can be selected to be very small, such as 5.1k / 25W. The actual power used is 10W, then the power of the overall load is 600W. The detected current is amplified by the software to achieve the purpose of verifying the three-phase unbalanced adjustment device. Replace the first load in each load unit in the load adjustment module with a light, so that it is more intuitive to see whether the light dims during the load power-on and phase change process, such as Figure 4 D1 to D9 in FIG. 1 (D1 to D9 are lamps). CT1 represents a current transformer provided between the first air circuit breaker and the busbar.

[0060] The following describes in detail the specific process of the detection method of the three-phase current imbalance adjustment device provided by Example 2 of the present invention:

[0061] KK1, KK2, K1 to K9 are in the closed state. The controller is powered on and queries the status, position and imbalance of the nine phase-changing switches, as well as the load positions of the five independent channels. As shown in the figure below, the controller enters the initial position state and begins to adjust. Taking the following table as an example, the adjustment is performed 13 times by only changing the phase of the independent load. It is simple and convenient for one person to operate. Each phase-changing switch can be tested to operate twice, verifying the phase-changing and communication functions of the phase-changing switch.

[0062] After the detection device of the three-phase current unbalance adjustment device is powered on, the phase positions of each load and the phase positions of each load after adjustment are operated to obtain switching state 1, as shown in Table 2:

[0063] Table 2

[0064]

[0065]

[0066] The independent loads are switched in the detection device of the three-phase current unbalanced regulating device, and groups 1 to 4 of the independent loads are switched to phase C, obtaining switching state 2, as shown in Table 3:

[0067] Table 3

[0068]

[0069] The independent loads are switched in the detection device of the three-phase current unbalanced regulating device, and the four groups of independent loads are switched to phase B, obtaining switching state 3, as shown in Table 4:

[0070] Table 4

[0071]

[0072] In the detection device of the three-phase current unbalanced regulating device, independent loads are switched, and one group of independent loads is switched to phase A, resulting in switching state 4, as shown in Table 5:

[0073] Table 5

[0074]

[0075] The independent loads are switched in the detection device of the three-phase current unbalanced regulating device, and the three groups of independent loads are switched to phase A, obtaining switching state 5, as shown in Table 6:

[0076] Table 6

[0077]

[0078] In the detection device of the three-phase current unbalanced regulating device, independent loads are switched. Four groups of independent loads are switched to phase A, 2, 3, and 5 groups of independent loads are switched to phase B, and 1 group of independent loads is switched to phase C. Switching state 6 is obtained, as shown in Table 7:

[0079] Table 7

[0080]

[0081] In the detection device of the three-phase current unbalanced regulating device, independent loads are switched. Groups 2, 3, and 5 of the independent loads are switched to phase A, and group 1 of the independent loads is switched to phase B. Switching state 7 is obtained, as shown in Table 8:

[0082] Table 8

[0083]

[0084] In the detection device of the three-phase current unbalanced regulating device, independent loads are switched, and groups 3 and 5 of independent loads are switched to phase B, resulting in switching state 8, as shown in Table 9:

[0085] Table 9

[0086]

[0087]

[0088] In the detection device of the three-phase current unbalanced regulating device, independent loads of groups 1 and 5 are switched to phase A, independent loads of groups 2 are switched to phase B, and independent loads of groups 3 and 4 are switched to phase C. Switching state 9 is obtained, as shown in Table 10:

[0089] Table 10

[0090]

[0091] The independent loads are switched in the detection device of the three-phase current unbalanced regulating device. Five groups of independent loads are switched to phase C, and the switching state 10 is obtained, as shown in Table 11:

[0092] Table 11

[0093]

[0094]

[0095] The independent loads are switched in the detection device of the three-phase current unbalanced regulating device. The independent loads of groups 1 and 2 are switched to phase C, and the switching state 11 is obtained, as shown in Table 12:

[0096] Table 12

[0097]

[0098] In the detection device of the three-phase current unbalanced regulating device, independent loads are switched, and two groups of independent loads are switched to phase A, and the switching state is 12, as shown in Table 13:

[0099] Table 13

[0100]

[0101]

[0102] In the detection device of the three-phase current unbalanced regulating device, independent loads are switched. Two groups of independent loads are switched to phase C, and one group of independent loads is switched to phase A. The switching state is 13, as shown in Table 14:

[0103] Table 14

[0104]

[0105] In addition to being used for factory inspection of phase-changing switches, the detection device for three-phase current unbalance regulation devices can also verify the functionality of SVG-type and phase-to-phase capacitor-type three-phase current unbalance regulation devices, making it suitable for purchasers to verify the manufacturer's three-phase unbalance control effect.

[0106] For the convenience of description, the various parts of the above-mentioned device are divided into various modules or units according to their functions and described separately. Of course, when implementing this application, the functions of each module or unit can be implemented in the same or multiple software or hardware.

[0107] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0108] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0109] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0110] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. A person skilled in the art can still modify or replace the specific implementations of the present invention with equivalents by referring to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention to be approved.

Claims

1. A detection device for a three-phase current unbalanced regulating device, characterized in that: The three-phase current imbalance adjustment device includes a controller and M phase-changing switches; the detection device includes an incoming line, a first air circuit breaker, a current transformer, a busbar, an independent load module and a load adjustment module, and the M phase-changing switches are detected by the independent load module and the load adjustment module; The first air circuit breaker is arranged on the incoming line, and the three-phase voltage and the neutral line of the output side are connected to the voltage incoming line of the controller, and it is connected to the busbar through the current transformer, and the independent load module and the regulated load module are respectively connected to the busbar; The independent load module includes a second air circuit breaker, N relay units and N load groups; The input end of the second air circuit breaker is connected to the busbar, the input ends of the N relay units are all connected to the output end of the second air circuit breaker, and the output ends thereof are respectively connected to the input ends of the N load groups, and the output ends of the N load groups are all connected to the neutral line; The load adjustment module includes M air relays and M load units; The input ends of the M air relays are connected to the busbar, and the output ends are respectively connected to one end of the first test line through the adapter terminal. The input ends of the M phase-changing switches are connected to the other end of the first test line through different alligator clips, and the output ends are connected to one end of the second test line through different alligator clips. The other end of the second test line is connected to the input ends of the M load units through the adapter terminal, and the output ends of the M load units are all connected to the neutral line.

2. The detection device of the three-phase current unbalance adjustment device according to claim 1, characterized in that: The primary side of the current transformer is connected to the first air circuit breaker, and the secondary side of the current transformer is connected to the current input line of the controller.

3. The detection device of the three-phase current unbalance adjustment device according to claim 1, characterized in that: The relay unit includes three relays, and the three relays are respectively connected to different phases.

4. The detection device of the three-phase current unbalanced regulating device according to claim 1, characterized in that: Each relay unit output end in the independent load module is connected to a corresponding load group. Each load group includes a different number of loads. The loads in each load group are connected in parallel via a transfer terminal.

5. The detection device of the three-phase current unbalanced regulating device according to claim 4, characterized in that: The first load group connected to the output end of the first relay unit in the independent load module includes one load, the second load group connected to the output end of the second relay unit includes two parallel loads, and so on. The Nth load group connected to the output end of the Nth relay unit includes N parallel loads.

6. The detection device of the three-phase current unbalanced regulating device according to claim 1, characterized in that: The output end of the phase-changing switch is correspondingly connected to a load group, each load group includes a different number of loads, and the loads in each load group are connected in parallel via a transfer terminal.

7. The detection device of the three-phase current unbalanced regulating device according to claim 6, characterized in that: The first load unit connected to the output end of the first phase-changing switch among the M phase-changing switches includes one load, the second load unit connected to the output end of the second phase-changing switch includes two loads, the third load unit connected to the output end of the third phase-changing switch includes three loads, and so on. The Mth load unit connected to the output end of the Mth phase-changing switch includes M loads.

8. A detection method for a three-phase current unbalanced regulating device, characterized in that: Based on the detection device according to any one of claims 1 to 6, the detection method includes: Calculate the three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state; Based on the three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state, the three-phase current imbalance regulating device operates until the three-phase current of the three-phase current imbalance regulating device reaches balance, and records the number and operation state of the operated phase-changing switch; Based on the recorded number and operation status of the action phase-changing switch, the phases of the relays in the independent load module are adjusted, and at the same time, the three-phase current imbalance adjustment device is operated until the three-phase current of the three-phase current imbalance adjustment device reaches a balance, and the number and operation status of the action phase-changing switch are recorded; Repeatedly adjust the phases of each relay in the independent load module until the three phases of the M groups of phase-changing switches are operating normally.

9. The detection method of the three-phase current unbalance adjustment device according to claim 8, characterized in that: The three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state is calculated as follows: Wherein, Δ represents the three-phase current imbalance degree of the three-phase current imbalance regulating device in the initial state; I MAX Indicates the maximum three-phase current of the three-phase current unbalance adjustment device, I MIN Indicates the minimum three-phase current of the three-phase current unbalance adjustment device.

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