A system and method for determining the sequence of disconnection of meter tail wires for live meter replacement training

Abstract

The application provides a meter tail disconnection sequence judgment system and method for live replacement of electric meter training, the meter tail disconnection sequence judgment system comprises a virtual load power supply, a joint junction box, a target electric meter and a signal acquisition circuit, the signal acquisition circuit comprises an MCU microprocessor, a state detection circuit and a coaxial terminal plug, the voltage line and the current line between the target electric meter and the joint junction box are connected by the coaxial terminal plug respectively, and each coaxial terminal plug is connected with the corresponding state detection circuit; the MCU microprocessor is connected with each state detection circuit respectively and is used for judging whether the disconnection operation of the student is qualified; if the output level of each state detection circuit changes to a preset state according to a preset sequence, it is determined that the disconnection operation of the student is qualified; wherein the preset sequence comprises a disconnection sequence and a connection sequence. Therefore, the application can assist in realizing live disassembly and assembly of electric energy meter training examination, and help the student to quickly master the live disassembly and assembly of electric energy meter skills.

Description

Technical Field

[0001] This invention relates to the field of live-line energy meter replacement technology, and more specifically, to a system and method for determining the disconnection sequence of the meter tail wires for training on live-line energy meter replacement. Background Technology

[0002] Replacing electricity meters is an important part of electricity metering management. To minimize the impact on users' electricity consumption, except for meters that must be replaced with a power outage, replacement is usually carried out under live voltage. Live-line meter replacement is a high-risk operation, concerning both electricity safety and the personal safety of personnel. Therefore, to standardize the operational procedures, training equipment is needed to train personnel. This ensures that they are proficient in the preparations, safety and technical measures, operating procedures, and related precautions before live-line meter replacement. Furthermore, their skill level must be assessed and certified before they are allowed to work on the job.

[0003] Current training and assessment devices for live meter installation and removal typically rely on instructors who observe trainees' operations in real time and judge the wiring sequence at the end of the three-phase meter. Alternatively, instructors may record trainees' meter installation and removal operations and then review the recordings. The drawback of this method is that, because trainees disconnect the voltage and current signals at the meter's end via a junction box beforehand, there are no voltage or current signals at the meter's terminals. Therefore, it's impossible to judge incorrect wiring sequences in real time, potentially leading to misjudgments or omissions.

[0004] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a meter tail disconnection and wiring sequence identification system for live meter replacement training. This system can assist in live meter disassembly and assembly training and assessment, helping trainees quickly master the skills of live meter disassembly and assembly.

[0006] To achieve the above objectives, the present invention provides a meter tail disconnection sequence discrimination system for training on live meter replacement, which includes a virtual load power supply, a combined junction box, a target meter and a signal acquisition circuit. The signal acquisition circuit includes an MCU microprocessor, a status detection circuit and a coaxial terminal plug. The voltage and current lines between the target meter and the combined junction box are respectively connected by coaxial terminal plugs, and each coaxial terminal plug is also connected to the corresponding status detection circuit. The virtual load power supply is used to provide virtual power, and the coaxial terminal plug is used to connect the voltage and current lines between the target meter and the junction box. The MCU microprocessor is connected to each state detection circuit to determine whether the student's disconnection and connection operations are qualified. If the output level of each state detection circuit changes to a preset state in a preset sequence, the student's disconnection and connection operations are deemed qualified. The preset sequence includes a disconnection sequence and a connection sequence. The disconnection sequence is: current IA+, current IA-, current IB+, current IB-, current IC+, current IC-, voltage UA, voltage UB, voltage UC, and voltage UN. The connection sequence is: voltage UN, voltage UC, voltage UB, voltage UA, current IC-, current IC+, current IB-, current IB+, current IA-, and current IA+.

[0007] To achieve the above objectives, the present invention provides a method for determining the disconnection sequence of the meter tail wires in training for live meter replacement, the method comprising: Each trainee is assigned a live-line energy meter swapping training device. This device includes a virtual load power supply, a junction box, a target energy meter, and a signal acquisition circuit. The signal acquisition circuit includes an MCU microprocessor, a status detection circuit, and coaxial terminal plugs. The voltage and current lines between the target energy meter and the junction box are connected via coaxial terminal plugs, and each coaxial terminal plug is also connected to a corresponding status detection circuit. The MCU microprocessor is connected to each status detection circuit. The status signal of the energized energy meter detected by the MCU microprocessor is obtained; wherein, the status signal of the energized energy meter refers to the high and low level signals returned by each status detection circuit; Based on the status signal of the live-line energy meter replacement, determine whether the trainee's disconnection and reconnection operation is qualified: If the output levels of each state detection circuit change to a preset state in a preset sequence, the student's disconnection and connection operation is deemed qualified. The preset sequence includes the disconnection sequence and the connection sequence. The disconnection sequence is: current IA+, current IA-, current IB+, current IB-, current IC+, current IC-, voltage UA, voltage UB, voltage UC, and voltage UN. The connection sequence is: voltage UN, voltage UC, voltage UB, voltage UA, current IC-, current IC+, current IB-, current IB+, current IA-, and current IA+.

[0008] The beneficial effects of this invention are as follows: This invention solves the problem in traditional training and assessment of live meter replacement where the evaluation of whether trainees' meter wiring sequence is correct is changed from real-time observation by the instructor to automatic detection. This reduces unnecessary work for instructors, improves their efficiency, and eliminates misjudgments and omissions during meter disassembly and assembly assessments, thus enhancing the fairness and impartiality of the assessment. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the coaxial terminal plug of the present invention; Figure 2 This is a schematic diagram of the installation of the coaxial terminal plug of the present invention; Figure 3 This is a schematic diagram of the signal acquisition circuit of the present invention; Figure 4 This is a schematic diagram of the signal acquisition circuit of the present invention. Figure 5 This is a schematic diagram of the cabinet structure of the live-lined energy meter swapping training device of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the cabinet structure of the live-lined energy meter swapping training device of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the communication principle of the present invention; In the diagram: 1. Terminal hole at the end of the meter; 2. Coaxial terminal plug; 201. First coaxial core; 202. Second coaxial core; 203. Connector; 204. Insulating section; 3. Terminal screws; 4. Cabinet; 5. Image acquisition unit; 6. Three-phase energy meter; 7. Outward-folding tray. Detailed Implementation

[0010] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0011] To facilitate understanding, the interactive parties and / or terms and / or custom terms involved in this invention will first be explained in conjunction with the technical solution of this invention: Virtual load power supply: Used to provide working power to the target meter while ensuring the safety of trainees; Combined junction box: This is a simulation device that matches the appearance and function of the real device, and can simulate the real scenario of switching energy meters under power as closely as possible. Target meters: including but not limited to three-phase meters, single-phase meters, etc., are simulation devices that are identical in appearance and function to real devices, and can simulate the real scenario of switching meters under power as much as possible.

[0012] Signal acquisition circuit: includes MCU microprocessor, status detection circuit and coaxial terminal plug 2. One status detection circuit is connected to one coaxial terminal plug, and one coaxial terminal plug is connected to a wiring hole at the end of the energy meter.

[0013] Coaxial terminal plug: Uses a two-core coaxial cable to assist in detecting whether the voltage and current lines between the meter and the junction box have been disconnected. See attached diagram for details. Figure 1 and attached Figure 2 as shown in the figure.

[0014] Example 1 This example provides a terminal wire disconnection and connection sequence discrimination system for live meter replacement training, which comprises a virtual load power supply, a combined junction box, a target electric meter and a signal acquisition circuit. The signal acquisition circuit comprises an MCU microprocessor, a state detection circuit and coaxial terminal plugs 2. Both voltage wires and current connecting wires between the target electric meter and the combined junction box are connected by coaxial terminal plugs 2 respectively, and each coaxial terminal plug 2 is also connected to a corresponding state detection circuit, as shown in the appended Figure 3 figure; wherein, the virtual load power supply is configured to provide a virtual power supply, and the coaxial terminal plugs are configured to connect voltage wires and current wires between the target electric meter and the combined junction box; the MCU microprocessor is respectively connected to each state detection circuit, and is configured to determine whether a trainee's wire disconnection and connection operation is qualified; if output levels of each state detection circuit change to a preset state according to a preset sequence, the trainee's wire disconnection and connection operation is determined to be qualified; wherein the preset sequence comprises a wire disconnection sequence and a wire connection sequence, the wire disconnection sequence is current IA+, current IA-, current IB+, current IB-, current IC+, current IC-, voltage UA, voltage UB, voltage UC and voltage UN, and the wire connection sequence is voltage UN, voltage UC, voltage UB, voltage UA, current IC-, current IC+, current IB-, current IB+, current IA-, current IA+.

[0015] It should be noted that during the live electric meter replacement training process, a trainee needs to remove an old electric meter and connect a new electric meter to the combined junction box; the present invention collects the wiring state of the electric meter terminal by using each path of state detection circuit and coaxial terminal plug: in the wire disconnection process, if the levels of the MCU_Detection 1 pin to the MCU_Detection 10 pin change from low level to high level in sequence, it is determined that the trainee's wire disconnection sequence is current IA+, current IA-, current IB+, current IB-, current IC+, current IC-, voltage UA, voltage UB, voltage UC and voltage UN; in the wire connection process, if the levels of the MCU_Detection 10 pin to the MCU_Detection 1 pin change from high level to low level in sequence, it is determined that the trainee's wire connection sequence is voltage UN, voltage UC, voltage UB, voltage UA, current IC-, current IC+, current IB-, current IB+, current IA-, current IA+, that is, the trainee's wire disconnection and connection operation can be determined to be qualified.

[0016] It should also be noted that during the disconnection process, if the voltage levels of MCU_Detection 1 to MCU_Detection 10 do not change from low to high sequentially, such as if the order is inconsistent and does not correspond to the preset disconnection order (e.g., MCU_Detection 1 pin – MCU_Detection 2 pin – MCU_Detection 4 pin – MCU_Detection 3 pin – MCU_Detection 5 pin – MCU_Detection 6 pin – MCU_Detection 10 pin – MCU_Detection 9 pin – MCU_Detection 7 pin – MCU_Detection 8 pin, changing from low to high sequentially), then the student's disconnection operation is unqualified. During the wiring process, if the levels of MCU_Detection 10 pin to MCU_Detection 1 pin do not change from high to low sequentially, and if the sequence is inconsistent and does not correspond to the preset wiring sequence, it indicates that the student's wiring operation is unqualified.

[0017] Example 2 Based on Example 1, this example provides another specific implementation of a meter tail disconnection sequence discrimination system for live meter replacement training; In some embodiments, the state detection circuit includes a DC-DC isolated power supply module, a current-limiting resistor, and an optocoupler isolator. The LED anode pin of the optocoupler isolator is connected to the DC-DC isolated power supply module through the current-limiting resistor. The LED cathode pin of the optocoupler in each state detection circuit is connected to one of the coaxial cores of the corresponding coaxial terminal plug 2. The DC-DC isolated power supply module in each state detection circuit is also connected to the other coaxial core of the coaxial terminal plug 2. The collector pin of the optocoupler in each state detection circuit is connected to the I / O pin of the MCU microprocessor, and the emitter pin of each optocoupler is grounded.

[0018] In some embodiments, the DC-DC (Direct Current) isolated power supply module is Mornsun B0505S-1WR3, the optocoupler is Everlight Electronics EL3H7-G, and the MCU (Microcontroller Unit) microprocessor is Chongqing Yateli AT32F403A series microcontroller.

[0019] It should be noted that when the target electricity meter is a three-phase electricity meter 6, the corresponding signal acquisition circuit is as shown in the attached diagram. Figure 4 As shown, a status detection circuit is connected to a coaxial terminal plug 2. The 10 sets of wiring at the end of the meter (the four sets of voltage lines A, B, C, and N, and the six sets of current lines A, B, and C) require 10 status detection circuits and 10 coaxial terminal plugs 2.

[0020] It should also be noted that each status detection circuit uses a separate DC-DC isolated power supply module, which can detect and determine the disconnection sequence of the meter tail based on the wiring status signal of the meter tail in the power-on and power-off states, and can detect in real time whether there is strong power at the meter tail.

[0021] In some embodiments, as shown in the appendix Figure 1 and attached Figure 2 As shown, the coaxial terminal plug 2 includes a first coaxial core 201, a second coaxial core 202, a plug-in 203, and a connector. The plug-in 203 is connected to the connector. The middle part of the connector is an insulating section 204, and the upper and lower parts of the connector are conductive sections. The first coaxial core 201 and the second coaxial core 202 are located in the plug-in 203. One end of the first coaxial core 201 and one end of the second coaxial core 202 extend outside the plug-in 203. The other end of the first coaxial core 201 extends to the upper part of the connector, and the other end of the second coaxial core 202 extends to the lower part of the connector.

[0022] In some embodiments, both the connector 203 and the insulating section 204 are made of insulating materials (such as rubber, resin, glass fiber, silicone rubber, etc.), and the conductive section is made of metal materials (such as iron, chromium, manganese, copper, etc.). The connector 203 is made of insulating material, which makes it easy for the trainee to hold the connector 203 by hand when the coaxial terminal plug 2 is inserted into the wiring hole at the end of the meter.

[0023] It should be noted that the coaxial terminal plug 2 is used to assist in detecting whether the voltage and current lines between the electricity meter and the junction box have been disconnected. When the coaxial terminal plug 2 is inserted into the end of the electricity meter, the first coaxial core 201 and the second coaxial core 202 are short-circuited; when the coaxial terminal plug 2 is pulled out from the end of the electricity meter, the first coaxial core 201 and the second coaxial core 202 will change from short-circuited to open. Therefore, when the first coaxial core 201 and the second coaxial core 202 are connected externally to the detection circuit, they can assist in detecting whether the voltage and current lines have been disconnected.

[0024] It should also be noted that the appearance of the coaxial terminal plug 2 is similar to that of an earphone plug, as shown in the attached figure. Figure 1 The plug shown is a dual-core coaxial cable with two contacts; the diameter of the plug 203 is larger than the diameter of the connector, and the diameter of the connector matches the inner diameter of the meter tail wiring hole 1; when the coaxial terminal plug 2 is connected to the meter tail, the plug 203 is locked outside the meter tail, and the connector is located in the meter tail wiring hole 1, as shown in the attached diagram. Figure 2 As shown.

[0025] As attached Figure 2 As shown, when the coaxial terminal plug 2 is inserted into a terminal hole 1 at the end of the meter and the terminal screw 3 at the end of the meter is tightened, the metal material of the terminal hole 1 and the terminal screw 3 will cause the two conductors in the coaxial terminal plug 2 to change from being disconnected to being short-circuited. This short-circuits the two wires, the first coaxial core 201 and the second coaxial core 202, thus short-circuiting the primary circuit of the optocoupler isolator. The optocoupler conducts, causing the MCU_detection1 pin connected to the secondary side of the optocoupler isolator to go low. Conversely, when the coaxial terminal plug 2 is removed from the terminal hole 1 at the end of the meter, the two contact points on the coaxial terminal plug 2 are disconnected, thereby disconnecting the two wires, the first coaxial core 201 and the second coaxial core 202, that is, the primary circuit of the optocoupler is disconnected, and the optocoupler is cut off, causing the MCU_detection 1 pin connected to the secondary side of the optocoupler to return to a high level. Therefore, the MCU microprocessor can centrally monitor the high and low level changes of the wiring holes between the meter tail and the junction box, and assist in determining the wiring status and wiring sequence of the meter tail.

[0026] Example 3 Based on the above embodiments, this embodiment provides another specific implementation of a meter tail disconnection and wiring sequence discrimination system for live meter replacement training; In some embodiments, the MCU microprocessor is also interconnected with the management backend to upload the wiring status signal of the meter tail collected by the status detection circuit to the management backend.

[0027] In some embodiments, the meter tail disconnection and wiring sequence determination system for live meter replacement training further includes a cabinet 4 and an image acquisition device 5 mounted on the cabinet 4, the image acquisition device being interconnected with the management backend. The image acquisition device 5 is used to collect video information of trainees during live three-phase energy meter replacement training and transmit it to the management backend.

[0028] It should be noted that this invention can also upload video information and wiring status signals of the meter tail to the management backend in real time during the live-line switching training of trainees, so that the proctors or training teachers can watch it at any time, and it is no longer limited to the limited view of vision and observation angle; one backend software on the management backend can connect and manage multiple live-line switching training devices at the same time. If a trainee makes an operation error, an abnormal reminder message for that trainee will pop up, and the operation of more trainees can be monitored or guided at the same time.

[0029] In some embodiments, the management backend can combine the recorded data of some frequently misunderstood steps in the student's entire process to analyze the steps that the student is not familiar with and output a report, so that the teacher can better understand the student's mastery level and give reasonable practice suggestions to improve learning efficiency.

[0030] Specifically, the image acquisition device 5 can be a high-definition camera DS-2DE2402IW-D3 / W or a camcorder TC-H126S, etc.

[0031] In some embodiments, the meter tail disconnection sequence determination system for live meter replacement training further includes an outward-folding tray 7 set on the cabinet 4, which is used to place the electricity meter to be installed or removed, or tools, etc.

[0032] In one specific implementation, as shown in the appendix Figure 5 and attached Figure 6 As shown, a set of combined junction boxes and target meters are respectively installed on the upper part of the panels on both sides (A side and B side) of the cabinet 4, which can meet the practical training needs of two students; an image acquisition device 5 is installed on the upper part of each side of the cabinet 4, and control buttons for A side and B side are also provided on the other side of the cabinet 4. The control buttons include a start button, a stop button and a reset button. As attached Figure 7 As shown, the PC serves as the management backend, used to run the backend software; the switch is used to realize data exchange between the management backend and the settings on side A and side B respectively; the repeater is used to convert the local CAN communication mode of side A or B into Ethernet communication; the communication control board is used to convert CAN communication into 3 RS485 channels and connect them to the meter tail disconnection sequence discrimination system of three-phase meter, the meter tail disconnection sequence discrimination system of single-phase meter, and the voice timer respectively for data exchange; the voice timer is used to display the countdown time and also to play the response prompt voice when there is a violation.

[0033] Example 4 Based on the above embodiments, this embodiment provides a method for determining the disconnection sequence of the meter tail wires in training for live meter replacement, the method comprising: Each trainee is assigned a live-line energy meter swapping training device. This device includes a virtual load power supply, a junction box, a target energy meter, and a signal acquisition circuit. The signal acquisition circuit includes an MCU microprocessor, a status detection circuit, and coaxial terminal plugs. The voltage and current lines between the target energy meter and the junction box are connected via coaxial terminal plugs 2, and each coaxial terminal plug 2 is also connected to a corresponding status detection circuit. The MCU microprocessor is connected to each status detection circuit. The status signal of the energized energy meter detected by the MCU microprocessor is obtained; wherein, the status signal of the energized energy meter refers to the high and low level signals returned by each status detection circuit; Based on the status signal of the live-line energy meter replacement, determine whether the trainee's disconnection and reconnection operation is qualified: If the output levels of each state detection circuit change to a preset state in a preset sequence, the student's disconnection and connection operation is deemed qualified. The preset sequence includes the disconnection sequence and the connection sequence. The disconnection sequence is: current IA+, current IA-, current IB+, current IB-, current IC+, current IC-, voltage UA, voltage UB, voltage UC, and voltage UN. The connection sequence is: voltage UN, voltage UC, voltage UB, voltage UA, current IC-, current IC+, current IB-, current IB+, current IA-, and current IA+.

[0034] In some embodiments, the coaxial terminal plug 2 includes a first coaxial core, a second coaxial core 202, a plug 203, and a connector, wherein the plug 203 is connected to the connector; the middle part of the connector is an insulating section 204, and the upper and lower parts of the connector are conductive sections; The first coaxial core 201 and the second coaxial core 202 are located in the connector 203, and one end of the first coaxial core 201 and one end of the second coaxial core 202 both extend outside the connector 203; The other end of the first coaxial core 201 extends to the upper part of the connector, and the other end of the second coaxial core 202 extends to the lower part of the connector.

[0035] It should be noted that if the levels of MCU_Detection 1 pin to MCU_Detection 10 pin change from low level to high level in sequence, it is determined that the current lines IA+, IA-, IB+, IB-, IC+, IC- and voltage lines UA, UB, UC, UN between the target meter and the junction box have been disconnected in sequence, and the student's disconnection operation is qualified.

[0036] It should also be noted that during the disconnection process, if a low level is present in any of the voltage levels from MCU_Detection 1 to MCU_Detection 6, or if the voltage levels do not sequentially change from low to high, then the disconnection of the current line between the target meter and the junction box is considered incomplete. Similarly, if a low level is present in any of the voltage levels from MCU_Detection 7 to MCU_Detection 10, or if the voltage levels do not sequentially change from low to high, then the disconnection of the voltage line between the target meter and the junction box is considered incomplete.

[0037] It should also be noted that during the wiring process, if a high level is present in any of the voltage levels from MCU_Detection 10 pin to MCU_Detection 7 pin, or if the voltage levels do not sequentially change from high to low, then the voltage line wiring operation between the target meter and the junction box is determined to be incomplete. Similarly, if a high level is present in any of the voltage levels from MCU_Detection 6 pin to MCU_Detection 1 pin, or if the voltage levels do not sequentially change from high to low, then the current line wiring operation between the target meter and the junction box is determined to be incomplete.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A meter tail disconnection sequence determination system for live meter replacement training, characterized in that: It includes a virtual load power supply, a combined junction box, a target meter, and a signal acquisition circuit. The signal acquisition circuit includes an MCU microprocessor, a status detection circuit, and a coaxial terminal plug. The voltage and current lines between the target meter and the combined junction box are connected by coaxial terminal plugs, and each coaxial terminal plug is also connected to the corresponding status detection circuit. The virtual load power supply is used to provide virtual power, and the coaxial terminal plug is used to connect the voltage and current lines between the target meter and the junction box. The coaxial terminal plug includes a first coaxial core, a second coaxial core, a plug and a connector, the plug and the connector being connected; the middle part of the connector is an insulating section, and the upper and lower parts of the connector are conductive sections; The first coaxial core and the second coaxial core are located in the connector, and one end of the first coaxial core and one end of the second coaxial core both extend outside the connector; The other end of the first coaxial core extends to the upper part of the connector, and the other end of the second coaxial core extends to the lower part of the connector; The MCU microprocessor is connected to each state detection circuit to determine whether the student's disconnection and connection operations are qualified. If the output level of each state detection circuit changes to a preset state in a preset sequence, the student's disconnection and connection operations are deemed qualified. The preset sequence includes a disconnection sequence and a connection sequence. The disconnection sequence is: current IA+, current IA-, current IB+, current IB-, current IC+, current IC-, voltage UA, voltage UB, voltage UC, and voltage UN. The connection sequence is: voltage UN, voltage UC, voltage UB, voltage UA, current IC-, current IC+, current IB-, current IB+, current IA-, and current IA+.

2. The tail wire disconnection sequence determination system according to claim 1, characterized in that, The status detection circuit includes a DC-DC isolated power supply module, a current-limiting resistor, and an optocoupler isolator. The LED anode pin of the optocoupler isolator is connected to the DC-DC isolated power supply module through the current-limiting resistor. The LED cathode pin of the optocoupler in each state detection circuit is connected to one of the coaxial cores of the corresponding coaxial terminal plug; the DC-DC isolated power supply module in each state detection circuit is also connected to the other coaxial core of the coaxial terminal plug. The collector pin of the optocoupler in each state detection circuit is connected to the I / O pin of the MCU microprocessor, and the emitter pin of each optocoupler is grounded.

3. The tail wire disconnection sequence determination system according to any one of claims 1 to 2, characterized in that, The MCU microprocessor is also interconnected with the management backend to upload the wiring status signal of the meter tail collected by the status detection circuit to the management backend.

4. The tail wire disconnection sequence discrimination system according to claim 3, characterized in that, It also includes a cabinet and an image acquisition device installed on the cabinet, which communicates and interconnects with the management backend.

5. A method for determining the sequence of disconnecting wires at the end of a meter for training on live meter replacement, characterized in that, include: Each trainee is assigned a live-line energy meter swapping training device. This device includes a virtual load power supply, a junction box, a target energy meter, and a signal acquisition circuit. The signal acquisition circuit includes an MCU microprocessor, a status detection circuit, and coaxial terminal plugs. The voltage and current lines between the target energy meter and the junction box are connected via coaxial terminal plugs, and each coaxial terminal plug is also connected to a corresponding status detection circuit. The MCU microprocessor is connected to each status detection circuit. The coaxial terminal plug includes a first coaxial core, a second coaxial core, a plug and a connector, the plug and the connector being connected; the middle part of the connector is an insulating section, and the upper and lower parts of the connector are conductive sections; The first coaxial core and the second coaxial core are located in the connector, and one end of the first coaxial core and one end of the second coaxial core both extend outside the connector; The other end of the first coaxial core extends to the upper part of the connector, and the other end of the second coaxial core extends to the lower part of the connector; The status signal of the energized energy meter detected by the MCU microprocessor is obtained; wherein, the status signal of the energized energy meter refers to the high and low level signals returned by each status detection circuit; Based on the status signal of the live-line energy meter replacement, determine whether the trainee's disconnection and reconnection operation is qualified: If the output levels of each state detection circuit change to a preset state in a preset sequence, the student's disconnection and connection operation is deemed qualified. The preset sequence includes the disconnection sequence and the connection sequence. The disconnection sequence is: current IA+, current IA-, current IB+, current IB-, current IC+, current IC-, voltage UA, voltage UB, voltage UC, and voltage UN. The connection sequence is: voltage UN, voltage UC, voltage UB, voltage UA, current IC-, current IC+, current IB-, current IB+, current IA-, and current IA+.

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