Teaching experiment platform based on three-phase imbalance simulation of power distribution network

Abstract

The invention provides a teaching device based on three-phase imbalance simulation of a power distribution network, which comprises a box body, an A-phase analog circuit, a B-phase analog circuit, a C-phase analog circuit and a grounding circuit are arranged on the box body, a first switch and a fourth load are arranged between the A-phase analog circuit and the grounding circuit, and a second switch and a fourth load are arranged between the B-phase analog circuit and the grounding circuit. The A-phase analog circuit, the B-phase analog circuit and the C-phase analog circuit are respectively connected with the grounding circuit through variable resistors; the grounding circuit is connected with the A-phase circuit through a first-gear switch, the grounding circuit is connected with the C-phase circuit through a second-gear switch, the grounding circuit is connected with the A-phase circuit, the B-phase circuit and the C-phase circuit through switches, various different circuit faults can be simulated through the arrangement of the three-phase simulation circuit and the grounding circuit, meanwhile, all circuit parts except a chip and part of interfaces can be detached and replaced, and the cost is reduced. The maintenance cost can be reduced; and voltage reduction processing is carried out on the circuit, absolute safety of a device user can be ensured, and good safety performance is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of power grid operation simulation teaching experiment platform, and in particular to a teaching experiment platform based on three-phase unbalanced simulation of a distribution network. Background Art

[0002] The distribution network generally refers to an electric power network with a voltage of 10kV to 0.4kV. The power supply method is generally a three-phase four-wire system, which bears a large number of three-phase loads and single-phase loads (such as mixed power and lighting loads). Since the single-phase load is not balanced and has a large randomness, it is easy to cause three-phase load imbalance in the distribution transformer, which has a great impact on the power system. When it comes to the three-phase imbalance of the distribution network, it is often boring and there is a phenomenon of forgetting what is learned. Grassroots teams often know how to do it, but don’t know why they do it, and they often deal with problems based on experience; and young employees often fail to quickly apply the knowledge they have learned to the site.

[0003] At present, three-phase unbalanced training teaching usually uses large-scale training devices, which are displayed through LED display screens or computers connected to the devices. They are widely used in training rooms because they can intuitively display the three-phase unbalanced states of various distribution network loads and simulate the solutions to three-phase unbalanced problems. However, they are mainly suitable for situations where the number of trainees is small and the number of times is large. At the grassroots level, it is difficult for grassroots trainers to conduct individual training for a single power supply station because of the full work schedule and heavy tasks. If multiple stations are trained, the large number of trainees and the scattered trainers will reveal the shortcomings of large-scale training devices that cannot be carried and moved and are used less frequently. Large-scale training devices are expensive and can only be operated by one person. When there are many trainees, they undoubtedly take up a lot of time for trainers and trainers. If the number of training devices is increased, the purchase cost and the cost of daily maintenance will make the grassroots miserable. A trainer usually trains twenty to thirty people at a time. The training device has high work intensity in a short period of time and its components are easily damaged.

[0004] In summary, there are technical problems in the prior art that the existing training equipment cannot be moved and cannot meet the daily training needs of grassroots departments. Summary of the invention

[0005] The main purpose of the present invention is to provide a teaching experiment platform based on three-phase unbalanced simulation of distribution network, so as to solve the technical problems existing in the related technology that the existing training equipment cannot be moved and cannot meet the daily training needs of grassroots departments.

[0006] In order to achieve the above object, according to one aspect of the present invention, a teaching experiment platform based on three-phase unbalanced simulation of distribution network is provided, comprising:

[0007] A box body is provided with an A-phase analog circuit, a B-phase analog circuit, a C-phase analog circuit and a grounding circuit, wherein a first switch and a fourth load are provided between the A-phase analog circuit and the grounding circuit, and the A-phase analog circuit, the B-phase analog circuit and the C-phase analog circuit are also connected to the grounding circuit through variable resistors, respectively; the grounding circuit is connected to the C-phase circuit through a two-speed switch, and the grounding circuit is connected to the A-phase circuit, the B-phase circuit and the C-phase circuit, respectively, through switches.

[0008] In some embodiments, the A-phase analog circuit includes a first ammeter, a first indicator light, a first load and a first variable resistor, wherein one end of the first ammeter, the first indicator light, the first load and the first variable resistor are connected in sequence, and the other end of the first variable resistor is connected to the ground circuit through a semiconductor diode.

[0009] In some embodiments, one end of the fourth resistor is circuit-connected to one end of the first load close to the first indicator light.

[0010] In some embodiments, the B-phase simulation circuit includes a second ammeter, a second indicator light, a second load and a second variable resistor, wherein one end of the second ammeter, the second indicator light, the second load and the second variable resistor are connected in sequence, and the other end of the second variable resistor is connected to the ground circuit through a second switch and a semiconductor diode.

[0011] In some embodiments, the C-phase simulation circuit includes a third ammeter, a third indicator light, a third load and a third variable resistor, wherein one end of the third ammeter, the third indicator light, the third load and the third variable resistor are connected in sequence, and the other end of the third variable resistor is connected to the ground circuit through a semiconductor diode.

[0012] In some embodiments, the grounding circuit includes a fourth switch, a fourth ammeter and a fourth variable resistor, and the fixed ends of the fourth switch, the fourth ammeter and the fourth variable resistor are connected in sequence, and the fixed end of the fourth variable resistor is also connected to the first switch.

[0013] In some implementations, a voltmeter is provided between the ground circuit and the C-phase analog circuit.

[0014] In some embodiments, the voltmeter is connected to one end of the third ammeter via a two-speed switch, and the other end of the two-speed switch is connected to the moving end of the fourth variable resistor.

[0015] In some implementations, a resistance value of the fourth load is smaller than resistance values ​​of the first load, the second load, and the third load.

[0016] In some embodiments, the range of the ammeter is 0-15A, and the range of the voltmeter is 0-250V.

[0017] The teaching experiment platform based on the three-phase unbalanced simulation of the distribution network provided by the present disclosure can simulate a three-phase unbalanced circuit by connecting the ammeter, voltmeter, control switch, terminal block, impedance load and screw button, and can simulate a variety of different circuit faults by setting a three-phase simulation circuit and a grounding circuit. At the same time, all circuit parts except the chip and some interfaces can be disassembled and replaced, which is beneficial to reducing maintenance costs; the line is subjected to voltage reduction treatment, which can ensure the absolute safety of the user of the device and has good safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 The structure diagram of the teaching experiment platform based on the three-phase unbalanced simulation of the distribution network provided by the present disclosure is shown;

[0020] Figure 2 A circuit diagram of a teaching experiment platform based on three-phase unbalanced simulation of a distribution network provided by the present disclosure is shown.

[0021] The above drawings include the following reference numerals:

[0022] 11. Power indicator light; 12. First indicator light; 13. Second indicator light; 14. Third indicator light; 21. First variable resistor; 22. Second variable resistor; 23. Third variable resistor; 24. Fourth variable resistor; 31. Voltmeter; 41. First ammeter; 42. Second ammeter; 43. Third ammeter; 44. Fourth ammeter; 51. Power switch; 52. First switch; 52. Second switch; 53. Fourth switch; 60. Second-speed switch. DETAILED DESCRIPTION

[0023] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, but are not intended to limit the present disclosure.

[0024] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0026] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0027] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0028] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0029] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0031] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0032] The present disclosure is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] In order to solve the technical problem in the related art that the existing training equipment cannot be moved and cannot meet the daily training needs of grassroots departments, the present invention provides a teaching experiment platform based on three-phase unbalanced simulation of distribution network.

[0034] Figure 1 The present invention shows a teaching experiment platform based on three-phase unbalanced simulation of distribution network, such as Figure 1 As shown, the teaching experiment platform based on the simulation of three-phase unbalanced distribution network includes a box, a power supply is arranged in the box, and a power switch 51, a power indicator light 11, an ammeter, a voltmeter 31, a control switch, a terminal block, an impedance load and a screw button are arranged on the box. By connecting the ammeter, the voltmeter 31, the control switch, the terminal block, the impedance load and the screw button, a three-phase unbalanced circuit can be simulated, wherein the power supply can be a lithium battery, such as an 8.4V lithium battery.

[0035] Further, Figure 2 The circuit diagram of a teaching experiment platform based on three-phase unbalanced simulation of distribution network provided by the present disclosure is shown as follows: Figure 2 As shown, the box is provided with an A-phase analog circuit, a B-phase analog circuit, a C-phase analog circuit and a grounding circuit, wherein a first switch 52 and a fourth load are provided between the A-phase analog circuit and the grounding circuit, and the A-phase analog circuit, the B-phase analog circuit and the C-phase analog circuit are also connected to the grounding circuit through variable resistors, respectively; the grounding circuit is connected to the C-phase circuit through a two-speed switch 60, and the grounding circuit is connected to the A-phase circuit, the B-phase circuit and the C-phase circuit, respectively, through switches.

[0036] Specifically, the A-phase analog circuit includes a first ammeter 41, a first indicator light 12, a first load and a first variable resistor 21, wherein the fixed ends of the first ammeter 41, the first indicator light 12, the first load and the first variable resistor 21 are connected in sequence, and the movable end of the first variable resistor 21 is connected to the ground circuit through a semiconductor diode.

[0037] The movable end of the first variable resistor 21 is connected to the movable end of the fourth variable resistor 24 through a semiconductor diode; the fixed end of the fourth variable resistor 24 is also connected to an end of the first load close to the first indicator light 12 through a first switch 52 and a fourth load.

[0038] The B-phase simulation circuit includes a second ammeter 42, a second indicator light 13, a second load and a second variable resistor 22, wherein the fixed ends of the second ammeter 42, the second indicator light 13, the second load and the second variable resistor 22 are connected in sequence, and the movable end of the second variable resistor 22 is connected to the ground circuit through a second switch and a semiconductor diode.

[0039] The mobile end of the second variable resistor 22 is connected to the mobile end circuit of the fourth variable resistor 24 through a second switch and a semiconductor diode.

[0040] The C-phase simulation circuit includes a third ammeter 43, a third indicator light 14, a third load and a third variable resistor 23, wherein the fixed ends of the third ammeter 43, the third indicator light 14, the third load and the third variable resistor 23 are connected in sequence, and the movable end of the third variable resistor 23 is connected to the ground circuit through a semiconductor diode.

[0041] The movable end of the third variable resistor 23 is connected to the movable end of the fourth variable resistor 24 via a semiconductor diode.

[0042] The grounding circuit includes a fourth switch 53, a fourth ammeter 44 and a fourth variable resistor 24. The fixed ends of the fourth switch 53, the fourth ammeter 44 and the fourth variable resistor 24 are connected in sequence. The fixed end of the fourth variable resistor 24 is also connected through the first switch 52 and the fourth load.

[0043] In order to measure the voltage, a voltmeter 31 is further provided between the grounding circuit and the C-phase analog circuit. The voltmeter 31 is connected to one end of the third ammeter 43 through a second-gear switch 60. Preferably, the voltmeter 31 is connected to one end of the third ammeter 43 away from the third indicator light 14 through the second-gear switch 60; the other end of the second-gear switch is connected to the moving end of the fourth variable resistor 24; so that the voltmeter 31 detects the voltage U between the grounding circuit and the C-phase circuit in the initial state. cn After the gear is changed, the voltage U on the fourth variable resistor 24 is detected. R4 .

[0044] In order to ensure accurate measurement of the circuit, the range of the ammeter is 0-15A, and the range of the voltmeter 31 is 0-250V.

[0045] In some implementations, a resistance value of the fourth load is smaller than resistance values ​​of the first load, the second load, and the third load.

[0046] During the application process, the simulation of different working conditions is achieved by changing the wiring method. When the line is in normal operation, the adjustable resistor is at the minimum value and the switch of the adjustable resistor is in the closed state.

[0047] When the first switch 52 and the fourth switch 53 are closed, the reading of the first ammeter 41 becomes larger, the reading of the fourth ammeter 44 becomes larger, and the brightness of the first indicator light 12 becomes brighter. At this time, it is used to simulate the state when a new load is connected to the distribution network at the power supply site;

[0048] When the fourth switch 53 is closed, the resistance of the fourth variable resistor 24 decreases, the readings of the first ammeter 41, the second ammeter 42, the third ammeter 43 and the fourth ammeter 44 all increase, and the corresponding indicator lights become brighter; when the resistance of the fourth variable resistor 24 is increased, the readings of the first ammeter 41, the second ammeter 42, the third ammeter 43 and the fourth ammeter 44 all decrease, and the corresponding indicator lights become dimmer or even go out. At this time, the difference in the simulated three-phase load is obvious, resulting in excessive neutral line current.

[0049] When the third switch is closed, the voltage meter 31 reads the negative voltage U on the fourth variable resistor 24. R4 When the third switch is turned on, the voltage meter 31 reads the line voltage U cn At this time, it is used to simulate the situation where there is a problem with the neutral wire or the live wire, such as a live wire failure, the neutral wire is energized; or a phase wire failure causes the neutral point to shift; the neutral wire is short-circuited, etc.

[0050] Of course, the knob of the desktop teaching device for three-phase unbalanced adjustment can realize the gear setting of various fault conditions. For example, A, B, and C phases have 1, 2, and 3 gears respectively, and can be set in random combination. In addition, the neutral line also has gear settings such as disconnection or high resistance, and the load can also be adjusted by sliding resistors, light bulbs, etc.; thus, it can simulate many different types of fault analysis.

[0051] In order to facilitate reading of the ammeter and voltmeter 31 data and to facilitate visual design of the circuit, the teaching experiment platform provided by the present disclosure can also communicate with the computer in real time.

[0052] Specifically, STEP 7 (TIAPortal) V18 is used to achieve real-time communication between the experimental platform and the computer. After the hardware detection is completed, click Go Online in the top task bar, select the correct interface and click Start Search, select the correct accessible node and click Go Online in the lower right corner. At this time, STEP 7 (TIAPortal) V18 software is officially connected to the CPU.

[0053] The programming software STEP 7 (TIA Portal) V18 is suitable for the system settings (CPU configuration) of the S7-1200 series PLC, for program development and real-time monitoring and operation. When operating the real object on the training device, the STEP 7 (TIA Portal) V18 software can monitor the trainer's operation in real time and display the real-time changes of the line on the corresponding circuit diagram, making the computer screen an external display of the device, making the demonstration more specific and easy to understand, and more suitable for the situation of training a large number of trainees at the same time.

[0054] After the teaching experiment platform provided by the present disclosure is connected to a computer, the built-in software can be used to score the students' operations in real time, conduct statistical analysis and generate reports, which is convenient for students to review after class. The real-time scoring mechanism encourages students to adjust their strategies immediately during the operation process and improve the efficiency of skill acquisition. At the same time, the system will conduct statistical analysis on the operation data of all students, identify common problems and individual differences in learning, provide targeted teaching adjustment suggestions for trainers, and provide a basis for the formulation of personalized learning paths for students.

[0055] Furthermore, in order to realize the conversion of voltage and current values ​​into digital tube display signals, the present invention uses sampling loop voltage value and current value chips, and displays them on the digital tube according to the overall amplification factor of the obtained data (in the unit value of A or V), thereby realizing normal display when the current and voltage action amplitude is large. This implementation method can minimize the required materials and save costs.

[0056] The teaching experiment platform based on the three-phase unbalanced power distribution network simulation provided by the present disclosure can simulate a three-phase unbalanced circuit by connecting the ammeter, voltmeter 31, control switch, terminal block, impedance load and screw button, and can simulate a variety of different circuit faults by setting a three-phase simulation circuit and a grounding circuit. At the same time, all circuit parts except the chip and some interfaces can be disassembled and replaced, which is beneficial to reducing maintenance costs; the line is subjected to voltage reduction treatment, which can ensure the absolute safety of the user of the device and has good safety performance.

[0057] The storage medium may be included in the electronic device, or may exist independently without being installed in the electronic device.

[0058] The storage medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device: obtains at least two Internet Protocol addresses; sends a node evaluation request including at least two Internet Protocol addresses to a node evaluation device, wherein the node evaluation device selects an Internet Protocol address from the at least two Internet Protocol addresses and returns it; receives the Internet Protocol address returned by the node evaluation device; wherein the obtained Internet Protocol address indicates an edge node in a content distribution network.

[0059] Alternatively, the storage medium carries one or more programs, and when the one or more programs are executed by the electronic device, the electronic device: receives a node evaluation request including at least two Internet Protocol addresses; selects an Internet Protocol address from the at least two Internet Protocol addresses; and returns the selected Internet Protocol address; wherein the received Internet Protocol address indicates an edge node in a content distribution network.

[0060] Computer program code for performing operations of the present disclosure may be written in one or more programming languages, or a combination thereof, including, but not limited to, object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the passenger computer, partially on the passenger computer, as a separate software package, partially on the passenger computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the passenger computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0061] It should be noted that the storage medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any storage medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0062] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0063] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, limit the unit itself.

[0064] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0065] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0066] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0067] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0068] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0069] Multiple embodiments of the present disclosure are described in detail above, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concepts of the present disclosure, and these variations and modifications should all fall within the scope of protection required by the present disclosure.

Claims

1. A teaching experiment platform based on three-phase unbalanced simulation of distribution network, characterized in that: The invention comprises a box body, on which an A-phase analog circuit, a B-phase analog circuit, a C-phase analog circuit and a grounding circuit are arranged, wherein a first switch (52) and a fourth load are arranged between the A-phase analog circuit and the grounding circuit, and the A-phase analog circuit, the B-phase analog circuit and the C-phase analog circuit are also connected to the grounding circuit via variable resistors respectively; the grounding circuit and the C-phase circuit are connected via a two-speed switch (60), and the grounding circuit and the A-phase circuit, the B-phase circuit and the C-phase circuit are connected via switches respectively.

2. The teaching experiment platform based on three-phase unbalanced simulation of distribution network according to claim 1 is characterized in that: The A-phase simulation circuit comprises a first ammeter (41), a first indicator light (12), a first load and a first variable resistor (21), wherein the first ammeter (41), the first indicator light (12), the first load and one end of the first variable resistor (21) are connected in sequence, and the other end of the first variable resistor (21) is connected to the ground circuit via a semiconductor diode.

3. The teaching experiment platform based on three-phase unbalanced simulation of distribution network according to claim 2 is characterized in that: One end of the fourth resistor is circuit-connected to one end of the first load close to the first indicator light (12).

4. The teaching experiment platform based on three-phase unbalanced simulation of distribution network according to claim 1 is characterized in that: The B-phase simulation circuit comprises a second ammeter (42), a second indicator light (13), a second load and a second variable resistor (22), wherein one end of the second ammeter (42), the second indicator light (13), the second load and the second variable resistor (22) are connected in sequence, and the other end of the second variable resistor (22) is connected to the ground circuit via a second switch and a semiconductor diode.

5. The teaching experiment platform based on three-phase unbalanced simulation of distribution network according to claim 1 is characterized in that: The C-phase simulation circuit comprises a third ammeter (43), a third indicator light (14), a third load and a third variable resistor (23), wherein one end of the third ammeter (43), the third indicator light (14), the third load and the third variable resistor (23) are connected in sequence, and the other end of the third variable resistor (23) is connected to the ground circuit via a semiconductor diode.

6. The teaching experiment platform based on three-phase unbalanced simulation of distribution network according to claim 1 is characterized in that: The grounding circuit comprises a fourth switch (53), a fourth ammeter (44) and a fourth variable resistor (24); the grounding circuit comprises the fourth switch (53), the fourth ammeter (44) and the fixed end of the fourth variable resistor (24) connected in sequence; and the fixed end of the fourth variable resistor (24) is also connected to the first switch (52).

7. The teaching experiment platform based on three-phase unbalanced simulation of distribution network according to claim 6 is characterized in that: A voltmeter (31) is provided between the grounding circuit and the C-phase analog circuit.

8. The teaching experiment platform based on three-phase unbalanced simulation of distribution network according to claim 7 is characterized in that: The voltmeter (31) is connected to one end of the third ammeter (43) via a second-gear switch (60), and the other end of the second-gear switch is connected to the movable end of the fourth variable resistor (24).

9. The teaching experiment platform based on three-phase unbalanced simulation of distribution network according to claim 8 is characterized in that: The resistance of the fourth load is smaller than the resistance of the first load, the second load and the third load.

10. The teaching experiment platform based on three-phase unbalanced simulation of distribution network according to claim 8, characterized in that: The measuring range of the ammeter is 0-15A, and the measuring range of the voltmeter (31) is 0-250V.

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