Distribution automation demonstration platform for simulating double-loop network line

Abstract

The utility model provides a power distribution automation demonstration platform for simulating a double-loop network line, which relates to the technical field of power distribution automation and comprises a plurality of switching stations and a power supply unit, the switching stations are connected with the power supply unit through the double-loop network line, and the switching stations are connected with the power supply unit through the double-loop network line. A comprehensive measurement and control unit, a plurality of distributed protection measurement and control units and a plurality of analog switches are arranged in each switching station, each analog switch is matched with one distributed protection measurement and control unit, and each distributed protection measurement and control unit is connected with the comprehensive measurement and control unit. According to the utility model, various fault types of a multi-power supply system can be simulated, the fault simulation function is complete, the demonstration of power supply recovery of distribution automation distributed function faults can be effectively realized, and the operation condition of a field power network is visually reflected.

Description

Technical Field

[0001] The utility model relates to the technical field of distribution automation, and particularly relates to a distribution automation demonstration platform for simulating a double-loop network line. Background Technique

[0002] The power network is closely related to people's material and cultural living standards. With the rapid development of the modern power network, the automation and intelligence levels of the distribution system are increasing day by day. Therefore, it is of great significance to ensure the stable operation of the distribution system.

[0003] At present, the distribution automation terminal is an important part of the distribution system, mainly applied to 10KV distribution network lines, which can monitor and control the operation state of the distribution lines, quickly and accurately locate and isolate the fault section after a fault occurs, and restore power supply to the non-fault area. The prior art discloses a distribution automation demonstration platform for simulating a double-power supply line, including a demonstration panel, a power adapter box, a No. 1 recloser box, a No. 2 recloser box, a distributed DTU protection and measurement and control box, a communication measurement and control box, an FTU box and several switch boxes. Among them, the recloser box, the distributed DTU protection and measurement and control box, and the FTU box are all equipped with switch boxes; this distribution automation terminal is to simulate a primary operating mechanism, secondary electrical components, secondary principle wiring, and the output of fault electrical quantities to build a ring main unit simulation system. However, this distribution automation terminal is connected to a double-power supply through a single-loop network, and the line is simple, unable to simulate various fault types of a multi-power supply system, that is, the circuit fault simulation function is limited, and only the basic functions of the distribution automation terminal are demonstrated, and the distributed functions of the distribution automation cannot be demonstrated. Summary of the Utility Model

[0004] In order to solve the problems of limited fault simulation function and inability to demonstrate the distributed functions of distribution automation in the above-mentioned prior art, the utility model provides a distribution automation demonstration platform for simulating a double-loop network line, which can simulate various fault types of a multi-power supply system, has a complete fault simulation function, can effectively realize the demonstration of the distributed function fault recovery power supply of distribution automation, and intuitively reflects the operation of the on-site power network.

[0005] In order to achieve the above technical effects, the technical solution of the utility model is as follows:

[0006] A distribution automation demonstration platform for simulating a double-loop network line includes: a plurality of switching stations and a power supply unit. The plurality of switching stations are connected to the power supply unit through a double-loop network line. Each switching station is provided with a comprehensive measurement and control unit, a plurality of parallel distributed protection and measurement and control units, and a plurality of sequentially connected analog switches. Each analog switch is matched with a distributed protection and measurement and control unit, and each distributed protection and measurement and control unit is connected to the comprehensive measurement and control unit.

[0007] In this technical solution, first, multiple switching stations are connected to the power supply unit through double-loop network lines. Through the integrated measurement and control unit 11, multiple distributed protection and measurement and control units 12, and multiple analog switches 13 provided in each switching station 1, various fault types of the multi-power supply system are simulated to demonstrate the generation, isolation, and recovery of line faults, and the fault simulation function is complete. Then, each analog switch is matched with a distributed protection and measurement and control unit, and each distributed protection and measurement and control unit is connected to the integrated measurement and control unit, which can effectively realize the demonstration of power supply restoration for distributed function faults of distribution automation and intuitively reflect the operation of the on-site power network. Further, through the practical operation and simulation of line section faults and the configuration and use of device functions on the distribution automation demonstration platform, the professional level of users can be improved relatively quickly, the understanding of distribution network automation functions by users can be strengthened, and the analysis and troubleshooting capabilities for line and equipment faults can be improved.

[0008] Preferably, the multiple switching stations are respectively a first switching station, a second switching station, and a third switching station, and the first switching station, the second switching station, and the third switching station are connected to the power supply unit through double-loop network lines; through the double-loop network line connection method, open-loop and closed-loop operation modes are realized, and various operation line architectures of connection points can be freely configured.

[0009] Preferably, the power supply unit includes an upper-loop power supply and a lower-loop power supply. The upper-loop power supply is connected to the first incoming and outgoing line end of the first switching station, and the lower-loop power supply is connected to the second incoming and outgoing line end of the first switching station. The third incoming and outgoing line end of the first switching station is connected to the first input / output end of the second switching station, and the fourth incoming and outgoing line end of the first switching station is connected to the second input / output end of the second switching station. The third input / output end of the second switching station is connected to the first incoming and outgoing line end of the third switching station, and the fourth input / output end of the second switching station is connected to the second incoming and outgoing line end of the third switching station. The third incoming and outgoing line end of the third switching station is connected to the upper-loop power supply, and the fourth incoming and outgoing line end of the third switching station is connected to the lower-loop power supply.

[0010] Preferably, the multiple analog switches are respectively a first incoming and outgoing line switch, a second incoming and outgoing line switch, a third incoming and outgoing line switch, a fourth incoming and outgoing line switch, a first feeder switch, a second feeder switch, and a bus tie switch. The first incoming and outgoing line switch, the second incoming and outgoing line switch, and the first feeder switch are respectively connected to the third incoming and outgoing line switch, the fourth incoming and outgoing line switch, and the second feeder switch through the bus tie switch; the main line fault short circuit is realized by using the first incoming and outgoing line switch, the second incoming and outgoing line switch, the third incoming and outgoing line switch, and the fourth incoming and outgoing line switch, the feeder section fault short circuit is realized by using the first feeder switch and the second feeder switch, and the bus fault short circuit is realized by using the bus tie switch:

[0011] Preferably, each of the analog switches is installed in a box body, and a display panel electrically connected to the analog switch is provided on the box body. A red and green light display circuit for indicating the live state of the line connected to the analog switch is provided on the display panel, where a red light indicates power on and a green light indicates power off.

[0012] Preferably, the display panel is further provided with function display and operation interfaces, and the line live state display, analog switch operation, fault simulation operation and mode selection of the distributed protection measurement and control unit are carried out by using the function display and operation interfaces on the display panel.

[0013] Preferably, the multiple distributed protection measurement and control units interact through a switch to facilitate communication between the distributed protection measurement and control units.

[0014] Preferably, each of the distributed protection measurement and control units is connected to the integrated measurement and control unit by a communication bus to facilitate the integrated measurement and control unit to receive the acquisition data of the distributed protection measurement and control units.

[0015] Preferably, each of the distributed protection measurement and control units is connected to a corresponding analog switch that matches it by wiring. The distributed protection measurement and control unit collects the current switch position, voltage and current of the analog switch by wiring, and at the same time controls the state change of the switch position of the analog switch by wiring, so as to facilitate the completion of the distributed protection function and quickly realize the isolation and recovery of faults.

[0016] Preferably, a remote control center is further included, and the remote control center is wirelessly connected to the integrated measurement and control unit to facilitate the remote control center to analyze and monitor the received acquisition data.

[0017] Compared with the prior art, the beneficial effects of the technical solution of the present utility model are:

[0018] The utility model provides a distribution automation demonstration platform for simulating a double-loop network line. Firstly, multiple switching substations are connected to the power supply unit through the double-loop network line. Through the integrated measurement and control units, multiple distributed protection and measurement and control units, and multiple analog switches arranged in the multiple switching substations, various fault types of a multi-power supply system are simulated to demonstrate the generation, isolation, and recovery of line faults, and the fault simulation function is complete. Then, each analog switch is matched with a distributed protection and measurement and control unit, and each distributed protection and measurement and control unit is connected to the integrated measurement and control unit, which can effectively realize the demonstration of power supply restoration for distributed function faults in distribution automation, and intuitively reflect the operation of the on-site power network. Further, through the practical simulation of line segment faults and the configuration and use of device functions on the distribution automation demonstration platform, the professional level of users can be improved relatively quickly, the understanding of distribution network automation functions by users can be strengthened, and the analysis and troubleshooting capabilities for line and equipment faults can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It shows a structural diagram of a distribution automation demonstration platform for simulating a double-loop network line proposed in an embodiment of the utility model;

[0020] Figure 2 It shows a communication diagram of a distribution automation demonstration platform for simulating a double-loop network line proposed in an embodiment of the utility model;

[0021] Figure 3 It shows a first display effect diagram of a distribution automation demonstration platform for simulating a double-loop network line proposed in an embodiment of the utility model;

[0022] Figure 4 It shows a second display effect diagram of a distribution automation demonstration platform for simulating a double-loop network line proposed in an embodiment of the utility model;

[0023] Figure 5 It shows a third display effect diagram of a distribution automation demonstration platform for simulating a double-loop network line proposed in an embodiment of the utility model;

[0024] Figure 6 It shows a fourth display effect diagram of a distribution automation demonstration platform for simulating a double-loop network line proposed in an embodiment of the utility model.

[0025] 1. Switching substation; 11. Integrated measurement and control unit; 12. Distributed protection and measurement and control unit; 13. Analog switch; 131. First incoming and outgoing line switch; 132. Second incoming and outgoing line switch; 133. Third incoming and outgoing line switch; 134. Fourth incoming and outgoing line switch; 135. First feeder switch; 136. Second feeder switch; 137. Bus tie switch; 2. Power supply unit; 21. Upper loop power supply; 22. Lower loop power supply. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The accompanying drawings are only for illustrative purposes and should not be construed as a limitation to this patent;

[0027] To better illustrate this embodiment, some parts of the accompanying drawings will be omitted, enlarged or reduced, which do not represent the actual size. Descriptions of directions such as "upper" and "lower" are not limitations to this patent;

[0028] For those skilled in the art, it is understandable that some well-known content descriptions in the accompanying drawings may be omitted;

[0029] The terms used to describe the positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation to this patent;

[0030] The technical solutions of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Embodiment 1

[0032] As Figure 1 shown, this embodiment provides a distribution automation demonstration platform for simulating a dual-ring network line, including: a plurality of switching stations 1 and a power supply unit 2. The plurality of switching stations 1 are connected to the power supply unit 2 through a dual-ring network line. Each switching station 1 is provided with an integrated measurement and control unit 11, a plurality of parallel distributed protection and measurement and control units 12, and a plurality of sequentially connected analog switches 13. Each analog switch 13 is matched with a distributed protection and measurement and control unit 12, and each distributed protection and measurement and control unit 12 is connected to the integrated measurement and control unit 11. Multiple analog switches 13 are used to simulate the on / off of the main line. Each analog switch 13 is matched with a distributed protection and measurement and control unit 12 to collect current, voltage, and switch quantity information and control the switch outlet. Each analog switch 13 communicates with its corresponding distributed protection and measurement and control unit 12, and through the cooperation of the distributed protection and measurement and control units, fault isolation and self-healing can be quickly achieved.

[0033] The distribution automation demonstration platform further includes a remote control center, which is wirelessly connected to the integrated measurement and control unit 11; each distributed protection and measurement and control unit 12 is connected to the integrated measurement and control unit 11 by means of an RS485 communication bus. The integrated measurement and control unit 11 transmits the collected data of each distributed protection and measurement and control unit 12 to the remote control center through wireless encryption. The remote control center analyzes and monitors the received collected data. If an abnormal situation or a value exceeding the preset threshold is found, the remote control center will automatically trigger an alarm mechanism to notify the maintenance personnel that a circuit failure has occurred;

[0034] A power distribution automation demonstration platform for simulating a double-loop network line proposed in this embodiment includes multiple switching substations 1 and a power supply unit 2. Each switching substation 1 is provided with a comprehensive measurement and control unit 11, multiple distributed protection and measurement and control units 12, and multiple analog switches 13. By means of the comprehensive measurement and control unit 11, multiple distributed protection and measurement and control units 12, and multiple analog switches 13 provided in the multiple switching substations 1, line faults are simulated to demonstrate the conventional protection, voltage-time protection, and distributed protection functions of the power distribution automation terminals in the power distribution network line; the multiple switching substations 1 are connected to the power supply unit 2 through a double-loop network line. Through the double-loop network line connection method, open-loop and closed-loop operation modes are realized, and various operation line architectures of the tie point are freely configured; each analog switch 13 is matched with a distributed protection and measurement and control unit 12, and each distributed protection and measurement and control unit 12 is connected to the comprehensive measurement and control unit 11 to realize the simulation of short circuit and grounding faults of the main line, bus, and feeder section. The line faults can be generated by the power distribution automation demonstration platform described in this embodiment or simulated by a relay protection tester, and it has a fault recording function; further, the power distribution automation demonstration platform described in this embodiment automatically judges the tie point for open-loop operation, realizes the restoration of power supply to the non-fault section, and has protection functions for switch failure and communication failure. It can also flexibly switch between conventional protection, voltage-current type FA, and distributed protection function modes to realize the simulation of the corresponding mode functions; in addition, through the practical simulation of line section faults and the configuration and use of device functions by the power distribution automation demonstration platform, the professional level of users can be improved quickly, the understanding of the power distribution automation functions by users can be strengthened, and the analysis and troubleshooting capabilities for line and equipment faults can be improved.

[0035] Embodiment 2

[0036] See Figure 2 , the number of the multiple switching substations 1 is set to 3, which are the first switching substation, the second switching substation, and the third switching substation respectively. The first switching substation, the second switching substation, and the third switching substation are connected to the power supply unit 2 through a double-loop network line.

[0037] The power supply unit 2 includes an upper-loop power supply 21 and a lower-loop power supply 22. The upper-loop power supply 21 is connected to the first incoming and outgoing line end of the first switching substation, and the lower-loop power supply 22 is connected to the second incoming and outgoing line end of the first switching substation. The third incoming and outgoing line end of the first switching substation is connected to the first input / output end of the second switching substation, and the fourth incoming and outgoing line end of the first switching substation is connected to the second input / output end of the second switching substation. The third input / output end of the second switching substation is connected to the first incoming and outgoing line end of the third switching substation, and the fourth input / output end of the second switching substation is connected to the second incoming and outgoing line end of the third switching substation. The third incoming and outgoing line end of the third switching substation is connected to the upper-loop power supply 21, and the fourth incoming and outgoing line end of the third switching substation is connected to the lower-loop power supply 22.

[0038] The number of the multiple analog switches 12 is set to 7, that is, each of the first switching station, the second switching station, and the third switching station includes 7 analog switches 12. The 7 analog switches 12 are respectively a first incoming and outgoing line switch 131, a second incoming and outgoing line switch 132, a third incoming and outgoing line switch 133, a fourth incoming and outgoing line switch 134, a first feeder switch 135, a second feeder switch 136, and a bus coupler switch 137. The first incoming and outgoing line switch 131, the second incoming and outgoing line switch 132, and the first feeder switch 135 are respectively connected to the third incoming and outgoing line switch 133, the fourth incoming and outgoing line switch 134, and the second feeder switch 136 through the bus coupler switch 137.

[0039] Among them, in the first switching station, the first incoming and outgoing line switch 131 in the first switching station is connected to the upper ring power supply 21, the third incoming and outgoing line switch 133 in the first switching station is connected to the lower ring power supply 22, the second incoming and outgoing line switch 132 in the first switching station is connected to the first incoming and outgoing line switch 131 in the second switching station, the fourth incoming and outgoing line switch 134 in the first switching station is connected to the third incoming and outgoing line switch 133 in the second switching station, the second incoming and outgoing line switch 132 in the second switching station is connected to the first incoming and outgoing line switch 131 in the third switching station, the fourth incoming and outgoing line switch 134 in the second switching station is connected to the third incoming and outgoing line switch 133 in the third switching station, the second incoming and outgoing line switch 132 in the third switching station is connected to the upper ring power supply 21, and the fourth incoming and outgoing line switch 134 in the third switching station is connected to the lower ring power supply 22.

[0040] Each of the analog switches 13 is installed in a box body. A display panel electrically connected to the analog switch 12 is provided on the box body. A red and green light display circuit for indicating the energized state of the line connected to the analog switch 12 is provided on the display panel, where the red light indicates energized and the green light indicates power failure.

[0041] The display panel is also provided with function displays and operation interfaces. The function displays and operation interfaces on the display panel are used for displaying the live state of the lines, operating the analog switches, simulating fault operations, and selecting the modes of the distributed protection and measurement and control units. Fault simulation mainly generates overcurrent and zero-voltage fault signals for each line segment, and each analog switch simulates the main switch of the line. Through the display panel, users or operators can intuitively simulate and view the operation process in a fault scenario. Such simulated operation display helps users or operators better understand the system behavior during a fault and provides a reference for actual fault handling. The display panel can display the operating states of the 12 lines of each analog switch in real time, including parameters such as voltage, current, and power, facilitating users or operators to quickly understand the working conditions of the 12 lines of each analog switch. The display panel can also support the operation function of the analog switch 12, allowing users or operators to perform switch simulation operations, which is beneficial to verifying the correctness and safety of switch operations, reducing errors and accident risks in the actual operations of users or operators, and facilitating improving the operation proficiency of users or operators. Through the display panel, users or operators can conveniently select different modes, such as normal operation mode, fault handling mode, test mode, etc.

[0042] The number of the multiple distributed protection and measurement and control units 12 is 7. The 7 distributed protection and measurement and control units 12 are respectively the first ring in-and-out interval device, the second ring in-and-out interval device, the third ring in-and-out interval device, the fourth ring in-and-out interval device, the first feeder interval device, the second feeder interval device, and the bus-coupler switch interval device. Among them, the distribution automation demonstration platform adopts a double-ring network line with a bus-coupler line architecture. The overall effect diagram of the distribution automation demonstration platform is as Figure 3 shown, and the line acquisition principle is as follows:

[0043] The first ring in-and-out interval device acquires the incoming current and the voltages on both sides of the first incoming and outgoing line switch 131. The second ring in-and-out interval device acquires the incoming current and the voltages on both sides of the second incoming and outgoing line switch 132. The third ring in-and-out interval device acquires the incoming current and the voltages on both sides of the third incoming and outgoing line switch 133. The fourth ring in-and-out interval device acquires the incoming current and the voltages on both sides of the fourth incoming and outgoing line switch 134. The first feeder interval device acquires the feeder current and the voltages on both sides of the first feeder switch 135. The second feeder interval device acquires the feeder current and the voltages on both sides of the second feeder switch 136. The bus-coupler switch interval device acquires the current of the lower ring power supply 22 and the voltages on both sides.

[0044] The display effect of the function configured for each distributed protection and measurement and control unit 12 is as follows:

[0045] See Figure 4, except for the bus-tie switches 137 in the first switching station, the bus-tie switches 137 in the second switching station, the bus-tie switches 137 in the third switching station, the second incoming / outgoing line switch 132 in the second switching station, and the third incoming / outgoing line switch 133 in the second switching station which are in the off position, i.e., in the de-energized state, the remaining analog switches 12 are in the on position, i.e., in the energized state.

[0046] See Figure 5 , press the lower-end fault buttons of the first incoming / outgoing line switch 131 in the first switching station and the first incoming / outgoing line switch 131 in the third switching station. The first incoming / outgoing line switch 131 in the first switching station, the second incoming / outgoing line switch 132 in the first switching station, the first incoming / outgoing line switch 131 in the third switching station, and the second incoming / outgoing line switch 132 in the third switching station trip due to overcurrent, and the faulty section is isolated.

[0047] See Figure 6 , the bus-tie switch 137 of the second switching station and the second incoming / outgoing line switch 132 in the second switching station close after a time delay, and the non-faulty section resumes power supply.

[0048] Embodiment 3

[0049] See Figure 2 , the multiple distributed protection and measurement control units 12 interact with each other through a switch. The switch, as the core device for the interaction and communication between the multiple distributed protection and measurement control units 12, can achieve high-speed and reliable data transmission. Frequent data exchange and instruction transmission are required between the distributed protection and measurement control units 12. The high-performance communication ability of the switch can ensure the real-time and accuracy of these operations; by connecting the multiple distributed protection and measurement control units 12 through the switch, redundant communication paths can be achieved; the switch also supports multiple communication protocols and data formats, and can meet the data exchange requirements between the distributed protection and measurement control units 12;

[0050] Each of the distributed protection and measurement and control units 12 is connected to the integrated measurement and control unit 11 through a communication bus. The distributed protection and measurement and control unit 12 collects current, voltage, and digital quantity information and controls the switch outlet. Each of the distributed protection and measurement and control units 12 is connected to a corresponding analog switch through a wiring method to match the distributed protection and measurement and control unit. The distributed protection and measurement and control unit collects the current switch position, voltage, and current of the analog switch through the wiring method, and at the same time controls the state change of the switch position of the analog switch through the wiring method, facilitating the completion of the distributed protection function and quickly realizing the isolation and recovery of faults. The integrated measurement and control unit 11 transmits the collected quantities of each distributed protection and measurement and control unit 12 to the remote control center through wireless encryption. In addition, each of the distributed protection and measurement and control units 12 uses the IEC61850+GOOSE communication protocol to communicate with adjacent interval devices to complete the distributed protection function and quickly realize the isolation and recovery of faults. When a fault occurs, through the IEC61850+GOOSE communication protocol, seamless integration and efficient communication between the distributed protection and measurement and control unit 12 and the analog switch 13 are ensured. The distributed protection and measurement and control unit 12 can quickly detect the fault and send a control instruction to the analog switch 13 matched with the current distributed protection and measurement and control unit 12 to realize the isolation and recovery of the fault. After the fault is isolated, the distributed protection and measurement and control unit 12 can automatically restore the power supply of the non-fault area according to the preset power supply restoration strategy.

[0051] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A distribution automation demonstration platform simulating a double-ring network line, characterized in that: include: A plurality of switchgear stations (1) and a power supply unit (2), wherein the plurality of switchgear stations (1) and the power supply unit (2) are connected via a double-loop network line, wherein each switchgear station (1) is provided with a comprehensive measurement and control unit (11), a plurality of parallel distributed protection and measurement and control units (12), and a plurality of analog switches (13) connected in sequence, wherein each analog switch (13) is matched with a distributed protection and measurement and control unit (12), and each distributed protection and measurement and control unit (12) is connected to the comprehensive measurement and control unit (11).

2. The power distribution automation demonstration platform simulating a double-ring network line according to claim 1 is characterized in that: The plurality of switchgears (1) are respectively a first switchgear, a second switchgear and a third switchgear, and the first switchgear, the second switchgear and the third switchgear are connected to the power supply unit (2) via a double-loop network line.

3. The distribution automation demonstration platform for simulating double-ring network lines according to claim 2 is characterized in that: The power supply unit (2) comprises an upper ring power supply (21) and a lower ring power supply (22), wherein the upper ring power supply (21) is connected to a first input / output terminal of a first switch station, the lower ring power supply (22) is connected to a second input / output terminal of the first switch station, the third input / output terminal of the first switch station is connected to a first input / output terminal of the second switch station, the fourth input / output terminal of the first switch station is connected to a second input / output terminal of the second switch station, the third input / output terminal of the second switch station is connected to a first input / output terminal of the third switch station, the fourth input / output terminal of the second switch station is connected to a second input / output terminal of the third switch station, the third input / output terminal of the third switch station is connected to the upper ring power supply (21), and the fourth input / output terminal of the third switch station is connected to the lower ring power supply (22).

4. The power distribution automation demonstration platform simulating a double-ring network line according to claim 1 is characterized in that: The multiple analog switches (13) are respectively a first incoming and outgoing line switch (131), a second incoming and outgoing line switch (132), a third incoming and outgoing line switch (133), a fourth incoming and outgoing line switch (134), a first feeder switch (135), a second feeder switch (136) and a bus tie switch (137); the first incoming and outgoing line switch (131), the second incoming and outgoing line switch (132) and the first feeder switch (135) are respectively connected to the third incoming and outgoing line switch (133), the fourth incoming and outgoing line switch (134) and the second feeder switch (136) via the bus tie switch (137).

5. The distribution automation demonstration platform for simulating double-ring network lines according to claim 1 is characterized in that: Each analog switch (13) is installed in a box, and a display panel electrically connected to the analog switch (13) is arranged on the box. The display panel is provided with a red and green light display circuit for indicating the power status of the circuit connected to the analog switch (13), wherein a red light indicates power is present and a green light indicates power is lost.

6. The distribution automation demonstration platform for simulating double-ring network lines according to claim 5 is characterized in that: The display panel is also provided with a function display and operation interface, which is used to display the line power status, simulate switch operation, fault simulation operation and mode selection of the distributed protection measurement and control unit.

7. The power distribution automation demonstration platform simulating a double-ring network line according to claim 1 is characterized in that: The multiple distributed protection measurement and control units (12) interact with each other via a switch.

8. The power distribution automation demonstration platform simulating a double-ring network line according to claim 1, characterized in that: Each of the distributed protection measurement and control units (12) is connected to the integrated measurement and control unit (11) via a communication bus.

9. The power distribution automation demonstration platform simulating a double-ring network line according to claim 1, characterized in that: Each of the distributed protection, measurement and control units (12) is connected to a corresponding analog switch matched with each of the distributed protection, measurement and control units by wiring.

10. The distribution automation demonstration platform for simulating double-ring network lines according to claim 1, characterized in that: It also includes a remote control center, which is wirelessly connected to the integrated measurement and control unit (11).

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