Three-phase four-wire direct-in type electric energy meter non-inductive replacement device and method

Abstract

The invention discloses a three-phase four-wire direct-in type electric energy meter non-inductive replacement device and method, and belongs to the technical field of electric energy meter maintenance. According to the device, a central processing unit, an acquisition circuit, a contactor, a control circuit of the contactor and a detection and protection circuit are arranged in a three-phase four-wire non-inductive meter changing instrument, and a current inlet wire and a current outlet wire are arranged outside the three-phase four-wire non-inductive meter changing instrument. Current can be introduced into the meter changing instrument through the incoming line and the outgoing line, so that the meter changing instrument temporarily replaces an electric energy meter to transmit the current, and through arrangement of various internal circuits, the whole meter changing instrument can be protected and the replacement device is prevented from being damaged by overload while whether wiring is successful or not can be detected. A bypass wiring mode is adopted, so that the disconnecting switch, the electric energy meter, the circuit breaker and the connecting wires are wound by the meter changing equipment to be in parallel short circuit, the equipment can be disconnected in the meter changing process, and normal electricity utilization of electricity customers is not affected.

Description

Technical Field

[0001] The invention belongs to the field of electric energy meter maintenance, and in particular relates to a three-phase four-wire direct-entry electric energy meter non-inductive replacement device and method. Background Art

[0002] The replacement of traditional three-phase four-wire direct-entry electricity meters must be carried out during a power outage. The work process includes seven steps: posting notices, transcribing electricity display numbers, informing users, power outage, disassembly and installation of meters, verification, and power supply. There are shortcomings such as many power outage and disassembly steps and a long time consumption, which affects the normal electricity use of three-phase power supply users.

[0003] The existing direct-entry non-stop meter replacement technology cannot meet the requirements of the on-load replacement of direct-entry energy meters in Beijing. For three-phase local fee-controlled meters, the switches behind the energy meters are equipped with a voltage loss tripping function. When replacing the energy meter with load, operations cannot be performed at the end of the energy meter. In order to meet the conditions for on-load replacement of three-phase local fee-controlled meters, only the specified wiring method can be used at the switches before and after the meter to meet the requirements for on-load replacement of the energy meter.

[0004] Based on this, for a long time, when replacing three-phase four-wire direct-entry electricity meters, it has been necessary to communicate with users in advance, clarify the power outage plan, and carry out power outage work. The user's normal electricity consumption will be affected, causing certain inconveniences and losses to users and enterprises.

[0005] After the above-mentioned power outage is completed to replace the direct-entry three-phase energy meter, when the switches before and after the meter are closed, a surge current will be generated, which is easy to burn the user's electrical equipment and cause property losses to the user. At the same time, the existing non-power-off meter replacement equipment, the energy meter is in a live state during the meter replacement process, and there are safety hazards for the meter replacement personnel. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a three-phase four-wire direct-entry electric energy meter non-inductive replacement device and method to solve the problem in the prior art that when replacing a three-phase four-wire direct-entry electric energy meter during a power outage, a regional power outage is required, and impact current is easily generated when the switches before and after the meter are closed; when replacing without power outage, the electric energy meter is in a live state during the meter replacement process, and there are safety hazards for the personnel replacing the meter.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A three-phase four-wire direct-entry electric energy meter non-inductive replacement device, comprising a three-phase four-wire non-inductive meter changing instrument, a central processing unit is arranged in the three-phase four-wire non-inductive meter changing instrument, and the central processing unit is respectively connected with a collection circuit, a contactor and its control circuit and a detection and protection circuit; the three-phase four-wire non-inductive meter changing instrument is provided with an input line, an output line and a grounding line;

[0009] When replacing the electric energy meter, the incoming line and the circuit breaker before the electric energy meter are electrically connected through the connector, and the outgoing line and the circuit breaker after the electric energy meter are electrically connected through the connector;

[0010] The acquisition circuit is used to collect the incoming line current and voltage. The central processing unit determines whether the three-phase four-wire inductive meter changer is overloaded through the collected current and voltage. If overloaded, the circuit inside the three-phase four-wire inductive meter changer is cut off through the contactor and its control circuit;

[0011] The detection and protection circuit is used to detect whether the incoming line is successfully connected to the circuit breaker before the meter, and whether the outgoing line is successfully connected to the circuit breaker after the meter.

[0012] A further improvement of the present invention is:

[0013] Preferably, the three-phase four-wire inductive meter changing instrument is provided with an indicator light outside, the central processing unit is connected to a status indication circuit, and the status indication circuit and the indicator light are electrically connected.

[0014] Preferably, the three-phase four-wire inductive meter changing device is externally provided with a switch, and the switch is electrically connected to the detection and protection circuit.

[0015] Preferably, the detection and protection circuit includes eight optocouplers, the No. pin and the No. pin of each optocoupler are connected to a phase input line or a phase output line, the No. pin of the optocoupler is grounded, and the No. pin is connected to a central processing unit.

[0016] Preferably, the connector includes a single ejector pin structure, a double ejector pin structure, an alligator clip and a puncture splitter.

[0017] Preferably, the single pin structure is connected to the incoming line, and the single pin structure includes a bracket and a support, the support is connected to one end of the bracket, a second copper connector passes through the support, one end of the second copper connector is electrically connected to the air switch, and the other end of the second copper connector is electrically connected to the incoming line.

[0018] Preferably, the double ejector structure is connected to the outlet line, and the double ejector structure includes a socket, which is connected to the air switch through a locking handle; two ejectors are arranged in the socket, one end of the two ejectors is electrically connected to the air switch, and the other end is electrically connected to the outlet line.

[0019] Preferably, the alligator clip is a clamping structure, comprising two torsionally connected clamping sections, and a bottom end of one clamping section is electrically connected to a ground wire.

[0020] Preferably, the puncture divider comprises a shell, a through hole is provided in the shell, and a puncture screw for connecting to a ground wire is provided on the shell.

[0021] A method for non-inductive replacement of a three-phase four-wire direct-entry electric energy meter based on the above device comprises the following steps:

[0022] (1) Connect the incoming line of the three-phase four-wire inductive meter changer and the corresponding grounding line to the incoming line circuit breaker of the electric energy meter; connect the outgoing line of the three-phase four-wire inductive meter changer and the corresponding grounding line to the outgoing line circuit breaker of the electric energy meter;

[0023] (2) The detection and protection circuit detects whether the incoming line, outgoing line and grounding line are connected successfully. If not, check the wiring and reconnect until the connection is successful;

[0024] (3) Disconnect the incoming and outgoing circuit breakers of the energy meter and disconnect the small wire of the undervoltage release;

[0025] (4) Use an electric test pen to check whether the electric energy meter is energized. If it is not energized, replace the electric energy meter;

[0026] (5) After the energy meter is replaced, connect the small line of the undervoltage release, turn on the incoming and outgoing line switches, the energy meter displays normal, and the power pulse indicator light flashes normally;

[0027] (6) Disconnect the three-phase four-wire inductive meter changer and the electric energy meter, and the replacement is completed.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention discloses a three-phase four-wire direct-entry electric energy meter non-inductive replacement device. The device utilizes the substation busbar maintenance and bypass busbar load principle, adopts the electrical equipment scheme between the bypass switch and the circuit breaker, and proposes a three-phase four-wire direct-entry electric energy meter non-inductive replacement method. During the meter replacement process, the user does not stop the power supply, and the electric energy meter is replaced with load and non-inductively. During the non-inductive replacement of the three-phase four-wire direct-entry electric energy meter, due to the bypass wiring method, the isolating switch, the electric energy meter, the circuit breaker and the connecting wires are bypassed and short-circuited in parallel by the meter replacement equipment, and the above equipment can be disconnected without affecting the normal power consumption of the electricity users. During the replacement process, the isolating switch and the circuit breaker can be disconnected, so that the electric energy meter, the isolating switch and the wires between the circuit breaker are not energized, ensuring the personal safety of the on-site staff.

[0030] In addition to the above advantages, the device of the present invention has the following advantages:

[0031] (1) Users will not be aware of the replacement of the energy meter, which improves their electricity satisfaction.

[0032] (2) When replacing an electric energy meter, only one connection method can be used to connect the electric energy meter to the inductive meter replacement device, which is convenient for promotion, training and learning.

[0033] (3) When replacing the electric energy meter, all the wires in and out of the meter are not energized, ensuring the safety of the on-site staff.

[0034] (4) Replacing an electric energy meter mainly involves tightening the screws at the end of the meter. The replacement time is short and the operation is simple.

[0035] (5) For metering boxes with relatively small spaces, the operating space is larger, the operation is more convenient, and it is more in line with safety regulations.

[0036] (6) Reduce or even avoid the communication costs of power outages and meter replacements, improve service quality, and reduce user complaints;

[0037] (7) Effectively improve the work quality and efficiency of employees. After the replacement is completed, no equipment required for the replacement will be left on site.

[0038] (7) It has a wide range of applications. It is applicable to the requirements for replacing user loads on electric energy meters with a rear switch after a voltage drop function, and is more applicable to the requirements for replacing user loads on electric energy meters without a rear switch after a voltage drop function.

[0039] Furthermore, an indicator light is arranged outside the three-phase four-wire inductive meter changer, so that it is possible to directly check whether the circuit is successfully connected on the outer surface of the three-phase four-wire inductive meter changer.

[0040] Furthermore, the three-phase four-wire inductive meter changing instrument is externally provided with a switch, through which the changing procedure can be started. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is an appearance diagram of the three-phase four-wire inductive meter changing instrument of the present invention;

[0042] Figure 2 This is a working connection diagram of the three-phase four-wire inductive meter changing instrument of the present invention;

[0043] Figure 3 This is an internal module diagram of the three-phase four-wire inductive meter changing instrument of the present invention;

[0044] Figure 4 This is the internal module circuit diagram of the three-phase four-wire inductive meter changing instrument of the present invention;

[0045] Figure 5a It is a schematic diagram of a single ejector structure;

[0046] Figure 5b It is a schematic diagram of single ejector structure connection;

[0047] Figure 5c This is a schematic diagram of the connection between two single ejector pins and an air switch;

[0048] Figure 6a It is a schematic diagram of a double ejector structure;

[0049] Figure 6b It is a schematic diagram of the double ejector structure connection;

[0050] Figure 7aThe structural diagram of the first form of the puncture divider;

[0051] Figure 7b It is a connection diagram of the first form of the piercing splitter;

[0052] Figure 8a A structural diagram of the second form of the puncture divider;

[0053] Figure 8b A connection diagram of the second form of the piercing splitter;

[0054] Figure 9a is a schematic diagram of the structure of the alligator clip 6;

[0055] Figure 9b This is a connection diagram of the alligator clip 6;

[0056] Fig.10 It is a schematic diagram of the contactor and its control circuit;

[0057] Fig.11 Schematic diagram of the connection connector of the three-phase four-wire non-inductive meter changer Figure 1 ;

[0058] Fig.12 Connecting the three-phase four-wire inductive meter changer to an electric energy meter Figure 1 ;

[0059] Fig.13 Schematic diagram of the connection connector of the three-phase four-wire non-inductive meter changer Figure 2 ;

[0060] Fig.14 Connecting the three-phase four-wire inductive meter changer to an electric energy meter Figure 2 .

[0061] Wherein: 1. three-phase four-wire inductive meter changer; 2. incoming line; 3. outgoing line; 4. single thimble structure; 5. double thimble structure; 6. crocodile clip; 7. piercing splitter; 8. grounding wire; 9. electric energy meter; 10. connector; 11. first copper connector; 401. bracket; 402. support; 403. second copper connector; 501. locking handle; 502. holder; 503. thimble; 5021. extending arm; 5022. wiring arm; 601. clamping section; 602. connecting thread; 701. shell; 702. through hole; 703. piercing screw. DETAILED DESCRIPTION

[0062] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0063] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0064] Combined with the background technology, it can be known that when replacing the existing three-phase four-wire direct-entry energy meter, it is mostly necessary to replace it through a large-scale power outage, which will bring inconvenience and losses to users and enterprises. At the same time, it will also generate impact current when the switch is closed, which is easy to burn the user's equipment. In addition, since the energy meter is in a live state during the meter replacement process, it brings safety hazards to the meter replacement personnel. In order to solve the above problems, the present invention provides a three-phase four-wire direct-entry energy meter non-inductive replacement device and method, which can replace the energy meter without affecting the electricity consumption of electricity users.

[0065] The present invention is directed to a three-phase four-wire direct-entry electric energy meter. An air switch is provided on both the incoming circuit and the outgoing circuit of the electric energy meter 9, which are the incoming circuit breaker and the outgoing circuit breaker respectively.

[0066] See also Figure 1 and Figure 2 The first aspect of the present invention discloses a three-phase four-wire direct-entry electric energy meter non-inductive replacement device, which includes a three-phase four-wire non-inductive meter changer 1, a three-phase incoming line 2, a three-phase outgoing line 3 and a grounding line 8; the first ends of the three-phase incoming line 2 and the three-phase outgoing line 3 are both connected to the three-phase four-wire non-inductive meter changer 1, the second end of the three-phase incoming line 2 and the incoming line circuit breaker of the electric energy meter 9 are connected through a connector 10, the second end of the three-phase outgoing line 3 and the outgoing line circuit breaker of the electric energy meter 9 are connected through a connector 10, and a switch button and an indicator light are provided on the panel of the three-phase four-wire non-inductive meter changer 1.

[0067] Through the above-mentioned connection relationship, the present invention can connect the circuits on both sides of the electric energy meter 9 to the two sides of the three-phase four-wire inductive meter changer 1, so that the three-phase four-wire inductive meter changer 1 temporarily plays the role of an "electric energy meter" and improves the safety of the meter change process by connecting the connector 10 and the circuit breaker.

[0068] See also Figure 3 and Figure 4 The three-phase four-wire inductive meter changer 1 is internally provided with a status indication circuit, a central processing unit (MCU), a detection and protection circuit, a contactor and its control circuit, a collection circuit and a switch button circuit.

[0069] Among them, one end of the status indication circuit is connected to the MCU, and the other end is connected to the indicator light on the panel of the three-phase four-wire inductive meter changer 1; the MCU indicates the connection status of the power line through a red and green two-color indicator light, green indicates a normal connection, red indicates an incorrect connection, and no light indicates no connection.

[0070] The input end of the detection and protection circuit is connected to the three-phase circuit and the neutral line, and the output end is connected to the MCU, which is used to detect whether the three-phase circuit and the neutral line are connected; the detection result is displayed through the status indication circuit.

[0071] The acquisition circuit is connected to the three-phase circuit and the neutral line, and the collected current and voltage data are transmitted to the MCU.

[0072] Contactor and its control circuit. The contactor is an actuator that connects or disconnects the power line. Its opening and closing state is controlled by its own control circuit. The control circuit of the contactor is connected to the MCU, and the opening and closing of the contactor is controlled by the control circuit.

[0073] The central processing unit (MCU), as the central control unit of the entire three-phase four-wire non-conductive meter changer 1, is used to control the reception, analysis, calculation and processing of relevant data information. Specifically, the MCU has at least the following two functions: (1) It can determine whether the entire device is overloaded based on the current and voltage data collected by the acquisition circuit. If overloaded, the contactor control circuit controls the on and off of the contactor, thereby controlling the on and off of the power line; (2) It can receive the output results of the detection and protection circuit, and the MCU transmits the detection results to the status indication circuit, and displays the connectivity results of each line through the indicator light.

[0074] The first end of the three-phase incoming line 2 is connected to the acquisition circuit, the contactor and its control circuit, and the detection and protection circuit, and the first end of the three-phase outgoing line 3 is connected to the contactor and its control circuit, and the detection and protection circuit; this connection method enables the acquisition circuit to obtain the current and voltage of the three-phase incoming line, the contactor can control the on and off of the circuit, and the detection and protection circuit can detect whether the three-phase incoming line 2 is connected to the three-phase four-wire inductive meter changer 1 and the incoming line circuit breaker, and whether the three-phase outgoing line 3 is connected to the three-phase four-wire inductive meter changer 1 and the outgoing line circuit breaker.

[0075] As a preferred solution, the second ends of the incoming line 2 and the outgoing line 3 are each provided with a first copper connector 11, which is used to connect to the air switch. Each first copper connector 11 is wrapped with insulating material on the outside, which facilitates the connection between the incoming line 2 or the outgoing line 3 and the connector 10 and can improve the safety of the device during disassembly and assembly.

[0076] Furthermore, as a preference, the indicator lights are both represented by red and green colors, where green indicates that the corresponding line is normally connected, red indicates an incorrect connection, and no light indicates no connection.

[0077] The switch button arranged on the front of the three-phase four-wire inductive meter changer 1 is a switch button of the contactor. When the wiring is abnormal, the switch button cannot be pressed, which further plays a protective role.

[0078] In some embodiments of the present invention, the connector 10 includes a single ejector pin structure 4, a double ejector pin structure 5, an alligator clip 6, and a piercing splitter 7;

[0079] As a preferred solution, see Figure 5a The single ejector pin structure 4 includes a bracket 401 and a support 402. The support 402 is installed on one end of the bracket 401. The support 402 is provided with a threaded hole. A first end of a second copper connector 403 passes through the support 402 and is threadedly connected to the threaded hole. The second end of the second copper connector 403 is provided with an external thread for connecting to the first copper connector 11.

[0080] The second copper connector 403 serves as an intermediate connector, used to connect the first copper connector 11 and the air switch. The first copper connector 11 and the second copper connector 403 are threadedly connected, and the internal copper points can contact to complete the circuit connection. The second copper connector 403 is wrapped with insulating material on the outside, which can improve the safety of the device during disassembly and assembly.

[0081] See also Figure 5b , Fig.11 and Fig.12 , the second end of the second copper connector 403 is threadedly connected to the first copper connector 11 of the incoming line 2 or the outgoing line 3; Figure 5c When the single ejector structure 4 is installed on the air switch, the bracket 401 is clamped with the bottom of the air switch, and the first end of the second copper connector 403 passes through the support 402 and is connected to the screw on the air switch, which is used to crimp the live wire or neutral wire of the air switch.

[0082] Further preferably, the bracket 401 is a bent structure, which can be clamped on the bottom of the air switch and combined with the threaded connection to enhance the connection force between the single ejector structure 4 and the air switch.

[0083] As a preferred solution, see Figure 6a The double ejector pin structure 5 includes a locking handle 501, a socket 502 and an ejector pin 503. The socket 502 is a U-shaped structure, including two extending arms 5021. The rear end surfaces of the two extending arms 5021 are integrally connected with a wiring arm 5022. A threaded hole is provided on each extending arm 5021, and the locking handle 501 is threadedly connected to the threaded hole. Two ejector pins 503 are arranged inside the lower extending arm 5021. A through hole is provided on the wiring arm 5022, and the incoming line 2 or the outgoing line 3 can be inserted into the through hole and threadedly connected to the through hole. The second ends of the two incoming lines 2 or the outgoing lines 3 are respectively abutted against and electrically connected to an ejector pin 503, and at the same time, the other ends of the two ejector pins 503 are abutted against the screws in the air switch, thereby being electrically connected.

[0084] See also Figure 6bWhen the double ejector pin structure 5 is connected to the air switch, the protruding end of the air switch is inserted between the two extended arms 5021. By rotating the two locking handles 501 at the upper and lower parts, the two extended arms 5021 and the air switch can be fastened; the incoming wire 2 or the outgoing wire 3 is inserted into the through hole and electrically connected to the screw of the air switch through the ejector pin 503.

[0085] As a preferred solution, see Figure 7a It is a form of puncture divider, which includes a shell 701. The shell 701 is composed of two parts that can mesh with each other. A through hole 702 is provided in the shell 701, and an external thread is provided outside the through hole. A puncture screw 703 is also provided in the shell 701; the through hole 702 is used for passing the wire, and the puncture screw 703 is used to connect with the first copper connector 11 of the grounding wire 8.

[0086] As a preferred solution, see Figure 8a It is another form of piercing splitter, including a shell 701, a through hole 702 is arranged inside the shell 701, and a piercing screw 703 is also arranged in the shell 701; the through hole 702 is used for passing the wire, and the piercing screw 703 is used to connect with the first copper connector 11 of the grounding wire 8.

[0087] See also Figure 7b and Figure 8b When the puncture splitter connects the wires of the air switch and the first copper connector 11 of the incoming line 2 or the outgoing line 3, the wires pass through the through hole 702, the copper connector 11 and the puncture screw 703 are threadedly connected, and the first copper connector 11 and the wires are electrically connected through the puncture screw 703.

[0088] As a preferred solution, Figure 9a It is a structural schematic diagram of the crocodile clip 6. The crocodile clip 6 is a clamping structure, including two twisted clamping sections 601. A connecting thread 602 is provided at the bottom of one clamping section 601 for connecting to the copper connector 11 of the grounding wire 8.

[0089] See also Figure 5b , Figure 5c , Figure 6b , Figure 7b and Figure 8b It can be seen that the second end of the incoming line 2 or the outgoing line 3 has a first copper connector 11, which can be directly electrically connected to the air switch. The connectors of the incoming line 2 or the outgoing line 3 are wrapped with insulating material, which facilitates the installation of the connector 10 and can improve the safety of the device during disassembly and assembly.

[0090] In some embodiments of the present invention, reference Fig.10The detection and protection circuit includes eight optocouplers, and the model of the eight optocouplers is PC817. Pin 1 of the first optocoupler is connected to the A-phase live wire input through a resistor R, pin 2 is connected to the B-phase live wire input, pin 3 is grounded, pin 4 is connected to the input end of the central processing unit, and is connected to the power supply VDD through a resistor R; pin 1 of the second optocoupler is connected to the A-phase live wire output through a resistor R, pin 2 is connected to the B-phase live wire output, pin 3 is grounded, pin 4 is connected to the input end of the central processing unit, and is connected to the power supply VDD through a resistor R; pin 1 of the third optocoupler is connected to the A-phase live wire input through a resistor R, pin 2 is connected to the A-phase live wire output, pin 3 is grounded, pin 4 is connected to the input end of the central processing unit, and is connected to the power supply VDD through a resistor R; pin 1 of the fourth optocoupler is connected to the B-phase live wire input through a resistor R, pin 2 is connected to the B-phase live wire output, pin 3 is grounded, pin 4 is connected to the input end of the central processing unit, and is connected to the power supply VDD through a resistor R; pin 1 of the fifth optocoupler is connected to C through a resistor R The first phase live line is connected to the input line of the first phase, the second pin is connected to the input line of the neutral line, the third pin is grounded, the fourth pin is connected to the input end of the central processing unit, and is connected to the power supply VDD through a resistor R; the sixth optocoupler's pin 1 is connected to the C phase live line output through a resistor R, the second pin is connected to the neutral line output, the third pin is grounded, the fourth pin is connected to the input end of the central processing unit, and is connected to the power supply VDD through a resistor R; the seventh optocoupler's pin 1 is connected to the C phase live line input through a resistor R, the second pin is connected to the C phase live line output, the third pin is grounded, the fourth pin is connected to the input end of the central processing unit, and is connected to the power supply VDD through a resistor R; the eighth optocoupler's pin 1 is connected to the neutral line input through a resistor R, the second pin is connected to the neutral line output, the third pin is grounded, the fourth pin is connected to the input end of the central processing unit, and is connected to the power supply VDD through a resistor R; the output end of the central processing unit is connected to four indicator lights, and the four indicator lights represent the connection status of the three-phase and neutral lines through different lines.

[0091] In some embodiments of the present invention, see Fig.11 and Fig.12 The three-phase four-wire inductive meter changer 1 is connected with the single pin structure 4, the double pin structure 5, and the piercing distributor 7. On the power supply incoming line side, the incoming lines 2 of the A phase, B phase, and C phase of the three-phase four-wire inductive meter changer 1 are connected to the A phase, B phase, and C phase of the circuit breaker in front of the meter through the single pin structure 4, respectively. It should be noted that each connector is connected to the power supply side of the switch in front of the meter; the outgoing lines 3 of the A phase, B phase, and C phase of the three-phase four-wire inductive meter changer 1 are connected to the A phase, B phase, C phase, and N phase of the load side of the circuit breaker behind the meter through the double pin structure 5, respectively. It should be noted that at this time, each connector is connected to the load side of the circuit breaker behind the meter. The grounding wire 8 corresponding to the incoming line 2 is connected to the ground bar through the piercing distributor 7, and the grounding wire corresponding to the outgoing line 3 is connected to the double pin structure 5. It should be noted that it is connected to the load side of the switch behind the meter.

[0092] In some embodiments of the present invention, see Fig.13 and Fig.14 , the three-phase four-wire inductive meter changer 1 is connected with the single pin structure 4, the double pin structure 5, and the alligator clip 6. On the power supply incoming line side, the incoming lines 2 of the A phase, B phase, and C phase of the three-phase four-wire inductive meter changer 1 are connected to the A phase, B phase, and C phase of the circuit breaker in front of the meter through the single pin structure 4, respectively. It should be noted that each connector is connected to the power supply side of the switch in front of the meter; the outgoing lines 3 of the A phase, B phase, and C phase of the three-phase four-wire inductive meter changer 1 are connected to the A phase, B phase, C phase, and N phase of the load side of the circuit breaker behind the meter through the double pin structure 5, respectively. It should be noted that at this time, each connector is connected to the load side of the circuit breaker behind the meter. The grounding wire 8 corresponding to the incoming line 2 is connected to the ground bar through the alligator clip 6, and the grounding wire corresponding to the outgoing line 3 is connected to the double pin structure 5. It should be noted that it is connected to the load side of the switch behind the meter.

[0093] A second aspect of the present invention discloses a method for non-inductive replacement of a three-phase four-wire electric energy meter, comprising the following steps:

[0094] (1) Check the appearance of the electric energy meter to see if it is intact, check whether the original wiring is correct, correctly measure the voltage, current, and phase angle connected to the electric energy meter, and determine whether the positive phase sequence wiring of the metering device is correct.

[0095] (2) Install the single pin structure 4 of phase A, phase B, and phase C of the three-phase four-wire inductive meter changer 1 onto the air switch through the bracket 401, connect the incoming line to the phase A, phase B, and phase C of the incoming line power supply side of the air switch in front of the meter through the copper connector 11, and connect the grounding wire of the three-phase four-wire inductive meter changer 1 through the wire clamp device (see Fig.14 , the wire clamp device is connected to the ground wire connector through the alligator clip 6) or the piercing device (see Fig.12 There are two types of puncture devices, both of which are connected to the incoming line 2 or the outgoing line 3 through the puncture screw 703, and then connected to the ground bar through the through hole 702 (connected to the ground wire connector).

[0096] (3) Fix the two double pin structures 5 of the three-phase four-wire inductive meter changer 1 and the base 502 on the air switch through the locking handle 501, and connect the screw hole at the tail of the extension arm 5021 and the connector at the end of the outlet 3 of the three-phase four-wire inductive meter changer 1; connect the A phase, B phase, C phase, and N phase on the load side of the air switch behind the electric energy meter. At this time, the green indicator light of the three-phase four-wire inductive meter changer 1 is on, indicating that the four power lines are connected normally; if there is an unlit indicator light, it means that the corresponding power line is not connected, and the corresponding connector needs to be tightened; if a red indicator light is on, it means that there is a wiring misalignment problem in the inlet and outlet power lines, and the wiring needs to be checked.

[0097] From the principle Fig.10As can be seen in the figure, the two optocouplers above are used to determine whether the A and B power lines are connected. When connected, the optocoupler outputs a low-potential signal, indicating a green light; otherwise, a high-potential signal is output, and the indicator light is off. The two optocouplers below are used to determine whether the A and B power lines are connected. If the optocoupler output is a high level, it indicates a wiring error, indicating a red light.

[0098] The next four optocouplers correspond to the C and N input and output power lines, and the detection principle is the same as that of the A and B input and output power lines.

[0099] (4) Press the switch button of the three-phase four-wire inductive meter changer 1. The switch button indicator light will light up, indicating that the bypass connection is completed; if the meter changer is in an incorrect wiring state, the switch button indicator light will not light up and the bypass connection action will not be performed to ensure the safety of the equipment and operators.

[0100] Based on principle Fig.10 Only when all indicator lights are green and the switch button is detected to be closed, the central processing unit (MCU) will perform the action of closing the bypass.

[0101] (5) The correctness of the bypass connection can be further judged by the jump of the current display data of each phase of the replaced energy meter; disconnect the switches before and after the meter. At this time, the energy meter is in a power-free state, and the user-side load is taken out by the three-phase four-wire inductive meter replacement instrument 1.

[0102] According to the characteristics of parallel current shunting, once the bypass connection of the meter-changing device is successful, the current value displayed by the original energy meter will be reduced exponentially. At this time, the user is powered by two circuits, the meter-changing device and the energy meter, and the removal of the energy meter will not cause the user to lose power.

[0103] (6) After confirming that the meter has no power with an electric test pen, the meter can be replaced according to the normal process. Since the switch behind the meter has been disconnected in advance, the two wires of the meter's undervoltage release can be removed normally without affecting the normal power consumption of the electricity users.

[0104] (7) After the energy meter is replaced, connect the small line of the undervoltage release and close the switches before and after the meter. At this time, the inlet and outlet wires at the end of the energy meter are energized, the meter screen displays normally, and the power pulse indicator light flashes normally.

[0105] (8) Press the switch button of the three-phase four-wire inductive meter changer 1 again. The button indicator light goes out, the bypass connection is disconnected and the short circuit fails, and the user load is normally taken out by the electric energy meter circuit.

[0106] (9) Remove the three-phase four-wire inductive meter changer 1 and related supporting equipment.

[0107] (11) Seal the energy meter and the box door. At this point, the energy meter has been replaced.

[0108] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the 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. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0109] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0110] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0111] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0112] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-phase four-wire direct-entry electric energy meter non-inductive replacement device, characterized in that: The invention comprises a three-phase four-wire inductive meter changer (1), wherein a central processing unit is arranged in the three-phase four-wire inductive meter changer (1), and the central processing unit is respectively connected to a collection circuit, a contactor and a control circuit thereof, and a detection and protection circuit; the three-phase four-wire inductive meter changer (1) is provided with an input line (2), an output line (3) and a ground line (8); When replacing the electric energy meter, the incoming line (2) and the circuit breaker before the electric energy meter are electrically connected via a connector (10), and the outgoing line (3) and the circuit breaker after the electric energy meter are electrically connected via a connector (10); The acquisition circuit is used to acquire the current and voltage of the incoming line (2); the central processing unit determines whether the three-phase four-wire inductive meter changing device (1) is overloaded based on the acquired current and voltage; if overloaded, the internal circuit of the three-phase four-wire inductive meter changing device (1) is cut off through the contactor and its control circuit; The detection and protection circuit is used to detect whether the incoming line (2) is successfully connected to the circuit breaker before the meter, and whether the outgoing line (3) is successfully connected to the circuit breaker after the meter.

2. A three-phase four-wire direct-entry electric energy meter non-inductive replacement device according to claim 1, characterized in that: The three-phase four-wire inductive meter changing device (1) is provided with an indicator light outside, and the central processing unit is connected to a status indicating circuit, and the status indicating circuit and the indicator light are electrically connected.

3. The three-phase four-wire direct-entry electric energy meter non-inductive replacement device according to claim 1 is characterized in that: The three-phase four-wire inductive meter changing device (1) is externally provided with a switch, and the switch is electrically connected to the detection and protection circuit.

4. The three-phase four-wire direct-entry electric energy meter non-inductive replacement device according to claim 1 is characterized in that: The detection and protection circuit includes eight optical couplers, wherein the No. 1 pin and the No. 2 pin of each optical coupler are connected to a phase input line or a phase output line, the No. 3 pin of the optical coupler is grounded, and the No. 4 pin is connected to the central processing unit.

5. The three-phase four-wire direct-entry electric energy meter non-inductive replacement device according to any one of claims 1 to 4, characterized in that: The connector (10) comprises a single ejector pin structure (4), a double ejector pin structure (5), an alligator clip (6) and a puncture divider (7).

6. A three-phase four-wire direct-entry electric energy meter non-inductive replacement device according to claim 5, characterized in that: The single ejector pin structure (4) is connected to the incoming line (2), and the single ejector pin structure (4) comprises a bracket (401) and a support (402), the support (402) is connected to one end of the bracket (401), a second copper connector (403) passes through the support (402), one end of the second copper connector (403) is electrically connected to the air switch, and the other end of the second copper connector (403) is electrically connected to the incoming line (2).

7. A three-phase four-wire direct-entry electric energy meter non-inductive replacement device according to claim 5, characterized in that: The double ejector pin structure (5) is connected to the outlet line (3), and the double ejector pin structure (5) comprises a holder (502), and the holder (502) is connected to the air switch via a locking handle (501); two ejector pins (503) are arranged in the holder (502), and one end of the two ejector pins (503) is electrically connected to the air switch, and the other end is electrically connected to the outlet line (3).

8. The three-phase four-wire direct-entry electric energy meter non-inductive replacement device according to claim 5 is characterized in that: The alligator clip (6) is a clamping structure, comprising two torsionally connected clamping sections (601), and the bottom end of one clamping section (601) is electrically connected to a grounding wire (8).

9. The three-phase four-wire direct-entry electric energy meter non-inductive replacement device according to claim 5 is characterized in that: The puncture wire divider (7) comprises a shell (701), a through hole (702) is provided in the shell (701), and a puncture screw (703) for connecting to a ground wire (8) is provided on the shell (701).

10. A method for replacing a three-phase four-wire direct-entry electric energy meter without induction based on the device of claim 1, characterized in that: The following steps are involved: The incoming line (2) and the corresponding grounding line (8) of the three-phase four-wire inductive meter changing device (1) are connected to the incoming line circuit breaker of the electric energy meter; the outgoing line (3) and the corresponding grounding line (8) of the three-phase four-wire inductive meter changing device (1) are connected to the outgoing line circuit breaker of the electric energy meter; The detection and protection circuit detects whether the incoming line (2), the outgoing line (3) and the grounding line (8) are connected successfully. If not, the wiring is checked and reconnected until the connection is successful; Disconnect the incoming and outgoing circuit breakers of the energy meter, and disconnect the small wire of the undervoltage release; Use an electric test pen to check whether the electric energy meter is energized. If it is not energized, replace the electric energy meter; After the energy meter is replaced, connect the small line of the undervoltage release, turn on the incoming and outgoing switches, the energy meter displays normal, and the power pulse indicator flashes normally; Disconnect the three-phase four-wire inductive meter changer (1) and the electric energy meter, and the replacement is completed.

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