Coaxial terminal plug, signal acquisition circuit and electrified exchange electric energy meter practical training device

Abstract

The utility model provides a coaxial terminal plug, a signal acquisition circuit and a live-line switching electric energy meter practical training device, the coaxial terminal plug comprises a first coaxial wire core, a second coaxial wire core, a plug connector and a connecting piece, the middle part of the connecting piece is an insulating section, and the upper part and the lower part of the connecting piece are conductive sections; one end of the first coaxial cable core and one end of the second coaxial cable core extend out of the plug connector; the other end of the first coaxial cable core extends to the upper portion of the connecting piece, and the other end of the second coaxial cable core extends to the lower portion of the connecting piece. The signal acquisition circuit comprises the coaxial terminal plug, an MCU microprocessor and a state detection circuit, and the MCU microprocessor is connected with the corresponding coaxial terminal plug through the corresponding state detection circuit. The live switching electric energy meter practical training device comprises a virtual load power supply, a combined junction box and a target electric meter, and further comprises the signal acquisition circuit, and the signal acquisition circuit is used for acquiring the wiring state signal of the tail of the electric meter.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power training and assessment equipment, in particular to a coaxial terminal plug, a signal acquisition circuit and a live electric energy meter replacement training device. Background Art

[0002] Replacing energy meters is an important part of power metering management. To minimize the impact on users' electricity consumption, except for meters that must be replaced during a power outage, replacement is usually performed under live power. Replacing energy meters under live power is a risky task that affects both electricity safety and the personal safety of staff. Therefore, to standardize the staff's operating procedures, training equipment is required to ensure that the staff are proficient in the preparations, safety and technical measures, operating procedures, and relevant precautions before replacing energy meters under live power. Their skill level must also be assessed and confirmed, and only those who pass the assessment can resume their work.

[0003] The existing training and assessment devices for live meter disassembly and installation usually have the teacher judge the wiring sequence of the three-phase meter tail by observing the trainee's operation in real time, or the teacher plays back the video of the trainee's meter tail disassembly and wiring operation for evaluation. The disadvantage of this testing method is that when disassembling and installing the electricity meter, the trainee has already cut off the voltage and current signals at the meter tail through the joint junction box in advance. The meter tail terminals no longer have voltage and current signals. If the trainee's meter tail wiring sequence is wrong, it cannot be judged in real time, and there may even be cases of misjudgment or omission.

[0004] Although the Chinese patent application number 202010864596.5 discloses an intelligent training device for hot-swap electric energy meters, which includes an installation shell, a timer body, a three-phase smart electric energy meter, a concentrator, a combined junction box and a virtual load power amplifier are fixedly installed inside the installation shell, and the three-phase smart electric energy meter, the installation shell and the undervoltage interruption timer allow trainees to better operate; however, the intelligent training device for hot-swap electric energy meters lacks devices to assist in detecting the disconnection of the meter tail, and is unable to detect whether the voltage line and the current line are removed.

[0005] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the Invention

[0006] The purpose of the utility model is to address the deficiencies of the prior art and thus provide a coaxial terminal plug, a signal acquisition circuit and a live electric energy meter replacement training device.

[0007] In order to achieve the above-mentioned objectives, the first aspect of the present invention provides a coaxial terminal plug, which includes a first coaxial core, a second coaxial core, a connector and a connector, wherein the connector is connected to the connector; the middle part of the connector is an insulating section, and the upper and lower parts of the connector are both conductive sections; the first coaxial core and the second coaxial core are in the connector, and one end of the first coaxial core and one end of the second coaxial core are both extended to the outside of 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.

[0008] In order to achieve the above-mentioned purpose, the second aspect of the present invention provides a signal acquisition circuit for training on live replacement of electric energy meters, which includes the above-mentioned coaxial terminal plug, and the coaxial terminal plug is used to connect the voltage line and current line between the target electric meter and the joint junction box; it also includes an MCU microprocessor and a status detection circuit, and the MCU microprocessor is connected to the corresponding coaxial terminal plug through the corresponding status detection circuit.

[0009] In order to achieve the above-mentioned purpose, the third aspect of the present invention provides a training device for live replacement of electric energy meters, including a virtual load power supply, a combined junction box and a target electric meter, wherein the virtual load power supply is connected to the target electric meter through the combined junction box; and also includes the above-mentioned signal acquisition circuit, which is used to collect the wiring status signal at the end of the electric meter, and each coaxial terminal plug is arranged on the corresponding voltage line and current line between the combined junction box and the target electric meter.

[0010] The beneficial effects of the utility model are:

[0011] 1) The utility model proposes a novel coaxial terminal plug, which adopts a dual-core coaxial line and is used to assist in detecting whether the voltage line and current line between the electric meter and the joint junction box are removed;

[0012] 2) The present invention also proposes a signal acquisition circuit including a coaxial terminal plug, which utilizes various status detection circuits and the coaxial terminal plug to acquire the connection status of the meter tail, and the MCU microprocessor centrally monitors the connection status signal of the meter tail;

[0013] 3) The present invention also proposes a live meter replacement training device including a signal acquisition circuit. The device comprises a virtual load power supply, a joint junction box and a target meter, etc. It can simulate the real scenario of live meter replacement as much as possible and ensure the personal safety of trainees during the training process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the coaxial terminal plug of the utility model;

[0015] Figure 2 This is a schematic diagram of the installation of the coaxial terminal plug of the utility model;

[0016] Figure 3 It is a structural diagram of the signal acquisition circuit of the utility model;

[0017] Figure 4 This is a schematic diagram of the circuit principle of the signal acquisition circuit of the utility model;

[0018] Figure 5 This is a schematic diagram of the cabinet structure of the live electric energy meter training device of the utility model. Figure 1 ;

[0019] Figure 6 This is a schematic diagram of the cabinet structure of the live electric energy meter training device of the utility model. Figure 2 ;

[0020] In the figure: 1. Terminal hole; 2. Coaxial terminal plug; 201. First coaxial core; 202. Second coaxial core; 203. Connector; 204. Insulation section;

[0021] 3. Terminal screws; 4. Cabinet; 5. Image collector; 6. Three-phase electricity meter; 7. Flip-out tray. DETAILED DESCRIPTION

[0022] The technical solution of the present utility model is further described in detail below through specific implementation methods.

[0023] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate and are merely used to describe the manner in which objects with the same attributes are described in the embodiments of this application.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] Example 1

[0026] This embodiment provides a specific implementation of a coaxial terminal plug 2, as shown in the attached Figure 1 and attached Figure 2As shown, the coaxial terminal plug 2 includes a first coaxial core, a second coaxial core 202, a plug 203 and a connector, and 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 both conductive sections;

[0027] 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 are both extended to the outside of the connector 203 ;

[0028] The other end of the first coaxial core 201 is extended to the upper portion of the connector, and the other end of the second coaxial core 202 is extended to the lower portion of the connector.

[0029] It should be noted that this embodiment proposes a coaxial terminal plug 2, which is used to assist in detecting whether the voltage line and current line between the electric meter and the joint junction box have been removed. When the coaxial terminal plug 2 is inserted into the end of the electric meter, the two wires, the first coaxial core 201 and the second coaxial core 202, will be short-circuited; when the coaxial terminal plug 2 is pulled out from the end of the electric meter, the two wires, the first coaxial core 201 and the second coaxial core 202, will change from being short-circuited to being disconnected; therefore, when the two wires, the first coaxial core 201 and the second coaxial core 202, are externally connected to the detection circuit, it can assist in detecting whether the voltage line and the current line have been removed.

[0030] It should also be noted that the appearance of the coaxial terminal plug 2 is similar to that of the headphone plug. Figure 1 The plug shown uses a twinax cable with two contacts.

[0031] In some embodiments, the diameter of the connector 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 connector 203 is stuck outside the meter tail, and the connector is in the meter tail wiring hole 1, as shown in the attached figure. Figure 2 shown.

[0032] In some embodiments, the connector 203 and the insulating segment 204 are both made of insulating materials, and the conductive segment is made of metal.

[0033] It should be noted that the connector 203 is made of insulating material, which makes it easier for trainees to hold the connector 203 with their hands when inserting the coaxial terminal plug 2 into the wiring hole at the end of the meter.

[0034] It should also be noted that the upper and lower parts of the connector are both conductive segments, and the conductive segments are made of metal. When the coaxial terminal plug 2 is connected to the tail of the electric meter, the metal wiring hole and the terminal screw 3 at the tail of the meter will short-circuit the two contact points on the coaxial terminal plug 2, thereby short-circuiting the two wires of the first coaxial core 201 and the second coaxial core 202.

[0035] It can be understood that the insulating material can be rubber, resin, glass fiber, silicone rubber, etc., and the metal material can be iron, chromium, manganese, copper, etc.

[0036] Example 2

[0037] Based on Example 1, this example provides a specific implementation of a signal acquisition circuit;

[0038] As attached Figure 3 As shown, the signal acquisition circuit includes the coaxial terminal plug 2 in Example 1, which is used to connect the voltage line and current line between the target meter and the joint junction box; it also includes an MCU microprocessor and a status detection circuit, and the MCU microprocessor is connected to the corresponding coaxial terminal plug 2 through the corresponding status detection circuit.

[0039] It can be understood that the target electricity meter includes but is not limited to a three-phase electricity meter 6, a single-phase electricity meter, etc.

[0040] It should be noted that when the target electric meter is a three-phase electric energy meter 6, the corresponding signal acquisition circuit is as shown in the attached Figure 4 As shown, one status detection circuit is connected to one coaxial terminal plug 2. The 10 wiring groups at the end of the table (4 voltage lines of A, B, C, N and 6 current groups of A, B, C phases in and out) need to be equipped with 10 status detection circuits and 10 coaxial terminal plugs 2.

[0041] When the target meter is a single-phase energy meter, due to the different number of interfaces, the circuit principle diagram of the corresponding signal acquisition circuit is different from Figure 4 Similarly, the difference lies in the number of status detection circuits and coaxial terminal plugs 2.

[0042] In some embodiments, the state detection circuit includes a DC-DC isolated power supply module, a current limiting resistor and an optocoupler isolator, the collector pin of the optocoupler isolator is connected to the I / O pin of the MCU microprocessor, and the emitter pin of the optocoupler isolator is grounded;

[0043] 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 isolator is connected to one of the coaxial cores of the corresponding coaxial terminal plug 2;

[0044] The DC-DC isolated power supply module is also connected to another coaxial core corresponding to the coaxial terminal plug 2.

[0045] It should be noted that when the coaxial terminal plug 2 is inserted into a meter terminal connection hole 1 and the terminal screw 3 of the meter terminal is tightened, the metal material of the meter terminal connection hole 1 and the terminal screw 3 will cause the two parts of the conductor in the coaxial terminal plug 2 to be short-circuited, thereby short-circuiting the first coaxial core 201 and the second coaxial core 202. That is, short-circuiting the primary circuit of the optocoupler isolator, the optocoupler is turned on, and the MCU_Detection 1 pin connected to the secondary of the optocoupler isolator becomes low.

[0046] On the contrary, when the coaxial terminal plug 2 is removed from the meter tail wiring hole 1, the two contact points on the coaxial terminal plug 2 are disconnected, thereby disconnecting the two wires of 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, so that the MCU_Detection 1 pin connected to the secondary of the optocoupler returns to a high level;

[0047] Therefore, the MCU microprocessor can centrally monitor the high and low level change information corresponding to the wiring holes between the meter tail and the joint junction box, and assist in determining the wiring status and wiring sequence of the meter tail.

[0048] In some embodiments, the DC-DC (Direct Current) isolated power supply module uses Golden Sun's B0505S-1WR3, and the isolation voltage reaches 3kV.

[0049] In some embodiments, the optical coupler isolator adopts Everlight Electronics EL3H7-G, which has an isolation voltage of 3.75kV, reliable performance and low cost.

[0050] In some embodiments, the MCU (Microcontroller Unit) microprocessor adopts Chongqing Artley's AT32F403A series single-chip microcomputer, which has reliable and stable performance and low cost.

[0051] Example 3

[0052] Based on the above embodiment, this embodiment provides a specific implementation of a live electric energy meter replacement training device;

[0053] The live electric energy meter replacement training device comprises a virtual load power supply, a joint junction box and a target electric meter, wherein the virtual load power supply is connected to the target electric meter via the joint junction box;

[0054] It also includes the signal acquisition circuit in Example 2, which is used to collect the wiring status signal at the end of the meter. Each coaxial terminal plug 2 is set on the corresponding voltage line and current line between the joint junction box and the target meter.

[0055] It is understandable that during the live electricity meter replacement training, trainees need to remove the old electricity meter and connect the new electricity meter to the joint junction box;

[0056] When the target electric meter is a three-phase electric energy meter 6, the signal acquisition circuit detects and determines the disconnection order of the tail of the three-phase electric energy meter 6 according to the level change state of the MCU_Detection 1 pin to the MCU_Detection 10 pin;

[0057] Wire removal order: First, remove the current wires (in order IA+, IA-, IB+, IB-, IC+, IC-). These wires are connected to the current input terminals of the three-phase energy meter 6 for measuring three-phase current. Then, remove the voltage wires (in order UA, UB, UC, UN). These voltage wires are usually connected to the voltage input terminals of the three-phase energy meter 6 for measuring three-phase voltage.

[0058] Wiring sequence: After the new three-phase electricity meter is installed in place, first connect the voltage wires (in sequence UN, UC, UB, UA), and ensure that these voltage wires are correctly connected to the voltage input terminals of the new three-phase electricity meter; then connect the current wires (in sequence IC-, IC+, IB-, IB+, IA-, IA+). When connecting the current wires, care should be taken to ensure that each wire is correctly connected to the corresponding current input terminal and in the correct direction.

[0059] It should be noted that the combined junction box and target meter of the live replacement electricity meter training device are simulation devices, which are consistent with the appearance and functions of real devices and can simulate the real scenario of live replacement of electricity meters as much as possible; the virtual load power supply is used to provide working power for the target meter while ensuring the safety of trainees.

[0060] In some embodiments, the live electric energy meter replacement training device further includes a cabinet 4 , and two sides of the cabinet 4 are respectively provided with a joint junction box, a target electric meter and a signal acquisition circuit.

[0061] In some embodiments, the live-changing electric energy meter training device further includes an image collector 5 provided on the cabinet 4, for collecting video information of trainees during the live-changing three-phase electric energy meter training process, to facilitate subsequent tracing; the image collector 5 can be a high-definition camera DS-2DE2402IW-D3 / W or a camera TC-H126S, etc.

[0062] In a specific embodiment, a live electric energy meter replacement training device can meet the training operation needs of two trainees; Figure 5and attached Figure 6 As shown, a set of combined junction boxes and target electric meters and other equipment are respectively installed on the upper part of the panels on the two side surfaces (side A and side B) of the cabinet 4. An image collector 5 is respectively installed on the upper part of the two side surfaces of the cabinet 4. Control buttons for side A and side B 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.

[0063] In some embodiments, the live electric energy meter replacement training device further includes an outward-folding tray 7 provided on the cabinet 4 , and the outward-folding tray 7 is used to place electric energy meters or tools to be installed or removed.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for protection of the utility model.

Claims

1. A coaxial terminal plug, characterized in that: It includes a first coaxial core, a second coaxial core, a plug-in connector and a connector, wherein the plug-in connector and the connector are connected; the middle portion of the connector is an insulating section, and the upper and lower portions of the connector are both 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 are both extended to the outside of the connector; The other end of the first coaxial core is extended to the upper portion of the connector, and the other end of the second coaxial core is extended to the lower portion of the connector.

2. The coaxial terminal plug according to claim 1, wherein: The diameter of the plug-in component is greater than the diameter of the connecting component.

3. The coaxial terminal plug according to claim 1, wherein: The connector and the insulating section are both made of insulating material, and the conductive section is made of metal.

4. A signal acquisition circuit, characterized in that: The coaxial terminal plug comprises the coaxial terminal plug according to any one of claims 1 to 3, wherein the coaxial terminal plug is used to connect the voltage line and the current line between the target electric meter and the joint junction box; It also includes an MCU microprocessor and a status detection circuit. The MCU microprocessor is connected to the corresponding coaxial terminal plug through the corresponding status detection circuit.

5. The signal acquisition circuit according to claim 4, characterized in that: The state detection circuit includes a DC-DC isolated power supply module, a current limiting resistor and an optocoupler isolator, the collector pin of the optocoupler isolator is connected to the I / O pin of the MCU microprocessor, and the emitter pin of the optocoupler isolator is grounded; 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 optical coupler isolator is connected to one of the coaxial cores of the corresponding coaxial terminal plug; The DC-DC isolated power supply module is also connected to another coaxial core corresponding to the coaxial terminal plug.

6. The signal acquisition circuit according to claim 5, characterized in that: The DC-DC isolated power supply module adopts B0505S-1WR3 produced by Goldensun.

7. The signal acquisition circuit according to claim 5, characterized in that: The optical coupler isolator adopts Everlight Electronics EL3H7-G.

8. A training device for replacing electric energy meters under power, characterized by: It includes a virtual load power supply, a joint junction box and a target electric meter, wherein the virtual load power supply is connected to the target electric meter through the joint junction box; It also includes the signal acquisition circuit according to any one of claims 4 to 7, wherein the signal acquisition circuit is used to collect the wiring status signal at the end of the meter, and each coaxial terminal plug is arranged on the corresponding voltage line and current line between the joint junction box and the target meter.

9. The live electric energy meter replacement training device according to claim 8 is characterized in that: It also includes a cabinet, and two sides of the cabinet are respectively provided with a joint junction box, a target electric meter and a signal acquisition circuit.

10. The live electric energy meter replacement training device according to claim 9 is characterized in that: It also includes an image collector arranged on the cabinet.

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