Method for improving meter calibration operation speed and safety of high-voltage electric energy metering device

Abstract

The invention discloses a method for improving meter calibration operation speed and safety of a high-voltage electric energy metering device, and belongs to the field of safety. An inlet wire binding post and an outlet wire binding post are respectively arranged on two sides in the junction box shell; a quick-cutting mechanism module and a verification execution mechanism are arranged between the wire inlet wiring terminal and the wire outlet terminal. A linkage sliding rod is arranged above the quick cutting mechanism module and is used for synchronously controlling the action of the quick cutting mechanism module; a clamping block type locking mechanism is arranged at the tail end of the sliding rod; a verification quick-switching mechanism is arranged above the verification execution mechanism and is used for synchronously controlling the action of the verification execution mechanism; the quick switching mechanism is adopted, so that quick switching between a meter adjusting state and a metering state is realized; through operation of the verification rapid switching mechanism, the metering state and the verification state of the tested electric energy meter can be rapidly switched on the premise that external wiring is not changed. While the verification efficiency is improved, the error rate of manual assembly and disassembly is reduced, and the probability of electric shock of personnel can also be reduced.

Description

Technical Field

[0001] The invention belongs to the field of electric power safety operation, and in particular relates to a method for improving the meter calibration operation speed and safety of a high-voltage electric energy metering device. Background Art

[0002] The electric energy metering device refers to the whole composed of an electric energy meter (abbreviated as electric meter or watt-hour meter), a metering transformer (including voltage transformer and current transformer) and secondary connecting wires.

[0003] With the continuous advancement of optimizing the electricity business environment, the use of transformer-type energy metering devices has become more and more widespread. In order to ensure the safety of meter replacement personnel, it is necessary to install an energy metering joint junction box in the secondary circuit to realize the connection between the transformer and the energy meter, collection terminal and other equipment.

[0004] The electric energy metering joint junction box (also called secondary junction box) is a component of the electric energy metering device and is used to connect the electric energy metering device with the external circuit.

[0005] In the secondary junction box, there are usually two rows of upper and lower multiple wiring terminals (terminals for short), each terminal represents a circuit connection point; usually the upper row of terminals is used to connect with the various wiring terminals of the electric energy meter, and the lower row of terminals is used to connect with external circuits or devices; between some terminals in the upper and lower rows, there is a detachable connecting copper sheet (connecting sheet for short), and by tightening or untightening these different connecting sheets with screws, the electrical connection relationship between the terminals in the upper and lower rows can be achieved, and different circuit functions can be achieved. For example, in the normal metering state, it is a wiring connection relationship. When the electric energy meter is replaced and verified, the power-off and verification functions of the relevant meters (referred to as meter replacement) are realized by toggling the connecting copper sheet in the junction box.

[0006] To ensure that the meter is powered off during the meter replacement process (i.e., no voltage or current input), it is necessary to use a screwdriver to move the connecting copper plate (referred to as the connecting plate or adjustment plate) in the junction box to switch the electricity meter between the metering state and the meter replacement state.

[0007] To switch from the metering state to the meter replacement state, the secondary circuit of each phase current transformer needs to be short-circuited (because the secondary side of the current transformer cannot be open-circuited) and the voltage terminal needs to be disconnected (or disconnected, because the secondary side of the voltage transformer cannot be short-circuited), so that there is no voltage access and no current flowing between the input ends of the electric energy meter and the collection terminal.

[0008] During this process, the meter changer needs to manually and repeatedly loosen and tighten 12 screws and move 6 copper sheets. After completing the meter change work, it is necessary to switch the state again to restore the meter from the meter change state to the metering state. Since multiple screws need to be loosened and tightened and the connecting pieces need to be moved, the meter change efficiency and operation speed of the meter changer are low. At the same time, because the junction box panel is in the open state, the metal parts of each screw and connecting piece are in an exposed state with electricity. When switching the meter state, the meter changer may accidentally touch the live parts and get an electric shock. On the other hand, if the personnel make a wiring error during this process, it will cause the transformer and other equipment to explode and cause an accident.

[0009] To ensure the safety of on-site operations, the invention patent with the authorization announcement date of 2022.01.18 and the authorization announcement number of CN 112290491B discloses "an insulation device for preventing accidental contact of an electric energy metering joint junction box", including a shielding body, which is a rectangular structure used to cooperate with the metering box and can shield the live terminals in the metering box; the shielding body is provided with a voltage protection component, which includes a first baffle, and a second baffle and a third baffle connected to both ends of the first baffle, and the voltage protection component is U-shaped; the first baffle is matched between the voltage terminal and the voltage connecting piece; the second baffle and the third baffle are matched on both sides of the voltage terminal; the shielding body is also provided with a connection part for connecting to the metering box. This technical solution places a baffle between the voltage terminal and the voltage connecting piece to clearly disconnect the voltage terminal and the voltage connecting piece, so as to avoid the connection between the voltage connecting piece and the voltage terminal, which may cause electric shock to the staff. However, this device only reduces the chance of electric shock caused by accidental touch by the personnel who change the meter. During the meter replacement process, it is still necessary to turn the screws and adjust the paddles in sequence to switch the meter operating status. This cannot improve work efficiency, nor can it effectively prevent accidents caused by personnel operating errors.

[0010] The invention patent with the authorization announcement date of 2024.04.05 and the authorization announcement number of CN 113820523 B discloses "a high-efficiency electricity metering joint junction box", including a box body and a box cover, and a plurality of wiring holes are arranged in the box body; the rotating connection unit is arranged in the wiring hole, including a telescopic component and a rotating component; the telescopic component includes a first sleeve, a second sleeve, and an elastic member, and the rotating component includes a rotating core, a limiter, and a clamping member, the second sleeve slides axially in the first sleeve, and the sliding of the second sleeve drives the rotating core to rotate in the second sleeve, and the first sleeve, the second sleeve, and the rotating core are concentric. This technical solution provides a three-phase three-wire electric energy metering joint junction box with a rotating element by embedding components such as a rotating core, a limiter, a clamping member, and a telescopic component in the junction box, which can effectively reduce the workload of personnel when switching the meter status and improve the work efficiency, but its rotating unit is prone to jamming and being unable to rotate during operation, resulting in the failure of the meter status switching during the operation.

[0011] The invention patent application with the application publication date of 2020.09.11 and the application publication number of CN 111650411 A discloses "a combined junction box and electric energy metering device", including a box body, and current terminals, voltage terminals, current connecting pieces, voltage connecting pieces, voltage loops, current loops and test holes arranged on the box body; wherein the current terminals and voltage terminals are used to connect to external cables; the test holes are respectively arranged on the voltage loop and the current loop, and the test holes can be electrically connected to the test line connectors of the external test instrument, and are used to test the voltage loop and the current loop on the box body; the conductive elastic sheet is arranged obliquely in the test hole, which is used to clamp the test line connector inserted into the test hole. It improves the installation stability of the test line connector and improves the safety of the test by using the conductive elastic sheet arranged obliquely in the test hole to clamp the test line connector. However, this modification method does not effectively solve the problem that the meter operation status needs to be manually switched.

[0012] In addition, the utility model patent with the authorization announcement date of 2014.09.24 and the authorization announcement number of CN 203850784 U discloses a "combined junction box for electric energy meters with voltage connecting pieces that can be turned on and off without being dislocated"; the utility model patent with the authorization announcement date of 2014.09.24 and the authorization announcement number of CN 203850785 U discloses a "combined junction box for electric energy meters with guillotine switch-type voltage connecting pieces". The above technical scheme develops a metering combined junction box with distribution voltage connecting pieces that can be turned on and off without being dislocated by modifying the voltage pick structure in the junction box. Although this modification method can effectively solve the problems of difficult docking and easy spark generation when moving the voltage pick, the meter changer still needs to manually adjust the current loop wiring, and it is also impossible to avoid problems such as manual misoperation and accidental contact with live parts.

[0013] In summary, there is an urgent need to develop a junction box that can quickly and accurately realize the state switching of the electric energy meter to replace the current manual switching method, while improving the efficiency of meter replacement, preventing people from electric shock and reducing the probability of accidents. Summary of the invention

[0014] The technical problem to be solved by the present invention is to provide a method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device. Based on the switching principle of the travel switch, a topological structure capable of simultaneously switching the phase voltage and current circuits is designed. On this basis, a sliding rod is installed to realize the simultaneous switching of three phases, and a card block type locking mechanism is added at the end of the sliding rod; at the same time, based on the switching principle of the micro switch, a topological structure capable of simultaneously switching the metering and calibration circuits with one key is designed. On this basis, a lever is installed to realize the simultaneous switching of three-phase circuits, and a calibration block locking mechanism is added to prevent misoperation and misoperation of personnel, so as to avoid electric shock.

[0015] The technical solution of the present invention is to provide a method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device, which is characterized by:

[0016] On both sides of the junction box housing, incoming wiring terminals and outgoing wiring terminals are respectively arranged;

[0017] A quick-cut mechanism module and a verification actuator are arranged between the incoming wiring terminal and the outgoing wiring terminal of each phase, forming an electric energy metering joint junction box with a quick switching function;

[0018] The quick-cut mechanism module includes a travel switch with a button and at least a pair of normally open contacts and a pair of normally closed contacts, which is used to realize the rapid conversion of the measured electric energy meter between the meter replacement state and the metering state without changing the external wiring;

[0019] The verification actuator comprises a micro switch with a pressure piece and at least one set of single-pole double-position contacts, which is used to realize the rapid switching of the measured electric energy meter between the metering state and the verification state without changing the external wiring;

[0020] Above the quick-cut mechanism module, a linkage slide bar is provided which can slide back and forth horizontally in the junction box housing to synchronously control the actions of the three quick-cut mechanism modules; at the end of the slide bar, a card-block type locking mechanism is provided;

[0021] A verification quick-cut mechanism is arranged above the verification actuator to synchronously control the actions of the three verification actuators;

[0022] The verification quick-cut mechanism is composed of a verification linkage lever and a verification block;

[0023] The verification linkage lever is a rectangular structural member, which can move horizontally in the junction box housing to control the action of the verification quick-cut mechanism;

[0024] The verification shift block is a rotatable convex block structure sleeved on the shaft, and its rotation plane is arranged on the same plane as the verification linkage shift rod;

[0025] By setting up a quick-cut mechanism module and a verification actuator, the electric energy meter under test can be quickly switched between the meter replacement state and the metering state, as well as quickly switched between the metering state and the verification state, thereby avoiding manual repetitive assembly and disassembly actions in each link during the process of switching the meter state, thereby improving the efficiency of meter replacement and reducing the error rate of manual assembly and disassembly; by setting up a card-type locking mechanism and a verification dial locking mechanism, it is effectively prevented from accidental contact and misoperation by personnel; by independently packaging the components, the probability of electric shock to personnel is reduced.

[0026] Specifically, there are multiple incoming terminals; there are multiple outgoing terminals; the multiple incoming terminals are respectively connected to the output ends of the voltage transformer and the current transformer of each phase; the multiple outgoing terminals are correspondingly connected to the connection terminals of each phase of the electric energy meter, the collection terminal or the standard electric energy meter.

[0027] Specifically, the linkage slide bar is arranged above the buttons of the three travel switches, and the actions of the quick-cut mechanism modules are synchronously controlled through the movable sliding of the linkage slide bar.

[0028] Furthermore, the synchronous control of the actions of each quick-cut mechanism module includes synchronously pressing or releasing buttons of each travel switch.

[0029] Specifically, there are three quick-cut check mechanisms; the quick-cut check mechanisms include a micro switch; a pressing piece is provided on the upper part of each micro switch, and by applying pressure to or releasing pressure on the pressing piece, the on-off mode of the single-pole double-position contact inside the micro switch can be changed, that is, the on-off mode of its normally open contact and normally closed contact can be changed;

[0030] The verification linkage lever is arranged above the three verification quick-cut mechanisms, and three pressure heads are arranged on the lever; through the movement of the verification linkage lever, the three pressure heads synchronously control the actions of the verification quick-cut mechanisms.

[0031] Furthermore, the synchronous control of the actions of each quick-cut mechanism module includes the three pressure heads of the verification linkage lever simultaneously driving the actions of the three micro switches in the verification quick-cut mechanisms, synchronously pressing down or releasing the pressure plates of each micro switch, and synchronously changing the states of the normally open contacts and the normally closed contacts in the micro switches.

[0032] Furthermore, when the pressing piece is not pressed down, the "1" terminal and the "2" terminal of the micro switch are in the on state, and the "1" terminal and the "3" terminal are in the off state; at this time, the output current of the current transformer is connected through the first incoming terminal I in1 , the first outlet terminal I out1 , flows through the current coil of the measured electric energy meter, and then passes through the second output terminal I out2 , the "2" and "1" terminals of the micro switch I, the second incoming line terminal I in2 , returns to the corresponding output terminal of the current transformer; in this state, the output of the current transformer is sent to the measured electric energy meter for measurement to count the corresponding electric energy parameters;

[0033] When the pressing piece is pressed down, the "1" and "2" terminals of the micro switch are in a disconnected state, and the "1" and "3" terminals are in a connected state; at this time, the output current of the current transformer is connected through the first incoming terminal I in1 , the first outlet terminal I out1, flows through the current coil of the measured electric energy meter, and then passes through the second output terminal I out 2, and the first test terminal IT1 connected to the second outlet terminal, after flowing through the current coil of the standard electric energy meter, through the second test terminal IT2, the "2" and "3" terminals of the micro switch, and the second inlet terminal I in2 , returns to the corresponding output terminal of the current transformer; in this state, the output of the current transformer is sent to the electric energy meter under test and the standard electric energy meter connected in series with it, and measurement is performed simultaneously to record the electric energy parameters of the electric energy meter under test and the standard electric energy meter in the same time period. By calculation and comparison, the measurement accuracy error between the electric energy meter under test and the standard electric energy meter can be known, and the calibration function of the electric energy meter under test can be realized.

[0034] Specifically, the block-type locking mechanism is a rotatable protrusion structure mounted on a shaft; when the block of the block-type locking mechanism is pushed in one direction, the linkage slide bar can slide left and right at will, which is an unlocked state; when the block of the block-type locking mechanism is pushed in another direction, the block is fixed between the structural member and the linkage slide bar, so that the linkage slide bar cannot slide freely along its sliding direction, which is a locked state.

[0035] Furthermore, when the verification dial block is moved in one direction, the verification linkage lever can slide up and down arbitrarily, which is an unlocked state; when the verification dial block is moved in another direction, the verification dial block is lifted up and fixes the verification linkage lever, so that the verification linkage lever cannot slide up and down freely, which is a locked state.

[0036] The method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device of the present invention realizes rapid conversion between a meter replacement state and a metering state by adopting a quick-cut mechanism; realizes rapid conversion between a metering state and a calibration state of a measured electric energy meter by setting a micro-switch type quick-cut mechanism; realizes switching or changing of external wiring of the electric energy meter by setting a travel switch and a micro-switch respectively between an incoming terminal and an outgoing terminal according to phases and changing the state of the travel switch or the micro-switch, thereby improving the efficiency of meter replacement work and reducing the error rate of manual assembly and disassembly; effectively prevents accidental contact and misoperation by personnel by setting a card block type locking mechanism and a dial block type locking mechanism; and reduces the probability of electric shock by personnel by adopting an independent packaging mode for components.

[0037] Compared with the prior art, the advantages of the present invention are:

[0038] 1. With the technical solution of the present invention, when it is necessary to enter the meter-changing state, the slide bar is pushed to the meter-changing position and the card block is pulled up to lock the slide bar, thereby conveniently switching the metering state to the meter-changing state; when it is necessary to enter the metering state, the card block is pulled down to unlock the slide bar and the slide bar is pushed to the metering position, thereby restoring the meter-changing state to the metering state. The entire switching operation process is simple and convenient;

[0039] 2. With the technical solution of the present invention, when it is necessary to enter the calibration state, the lever is pushed to the calibration position and the dial block is turned upward to lock the lever, thereby conveniently switching the metering state to the calibration state; when it is necessary to enter the metering state, the dial block is pushed downward to unlock the lever and push the lever to the metering position, thereby restoring the calibration state to the metering state. The entire switching operation process is simple and convenient;

[0040] 3. The technical solution of the present invention adopts a quick-cut mechanism to realize the rapid conversion between the meter replacement state and the metering state, avoiding the manual repetitive assembly and disassembly actions in each link of the meter switching state process; it can effectively reduce the operation time, improve the efficiency of meter replacement work, and reduce the error rate of manual assembly and disassembly;

[0041] 4. The technical solution of the present invention, by providing a locking mechanism and independently packaging the components, can effectively prevent people from accidentally touching or operating the components, thereby reducing the probability of electric shock. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a wiring mode schematic diagram of an existing transformer type electric energy metering device;

[0043] Figure 2 It is a schematic diagram of the state switching principle of the electric energy metering device;

[0044] Figure 3a and Figure 3b It is a schematic diagram of the switching principle of the travel switch;

[0045] Figure 4 It is a schematic diagram of the circuit topology structure of the quick-cut electric energy meter junction box of the present invention;

[0046] Figure 5 It is a PCB circuit board design drawing of the quick-cut electric energy meter junction box of the present invention;

[0047] Figure 6 It is a 3D structural schematic diagram of the quick-cut electric energy meter junction box of the present invention;

[0048] Figure 7a and Figure 7b It is a schematic diagram of the action of the slide bar driving button of the present invention;

[0049] Figure 8aIt is a structural schematic diagram of the card block type locking mechanism of the present invention in an unlocked state;

[0050] Figure 8b It is a structural schematic diagram of the card block type locking mechanism of the present invention in a meter changing state;

[0051] Fig. 9 It is a structural schematic diagram of a real junction box sample of the present invention;

[0052] Fig.10a and Fig.10b It is a schematic diagram of the switching principle of the verification state actuator of the present invention;

[0053] Fig.11a and Fig.11b It is a schematic diagram of the driving mode of the verification state verification linkage lever of the present invention;

[0054] Fig.12 It is a schematic diagram of the circuit topology design of the junction box of the present invention;

[0055] Fig.13a and Fig.13b It is a schematic diagram of the switching of the measurement and verification circuit of the present invention;

[0056] Fig.14 It is a three-dimensional structural schematic diagram of the junction box of the present invention;

[0057] Fig.15 It is a wiring diagram of the junction box of the present invention in the verification state;

[0058] Fig.16 It is a schematic diagram of the verification operation of the junction box of the present invention. DETAILED DESCRIPTION

[0059] The present invention will be further described below in conjunction with the accompanying drawings.

[0060] The wiring mode of the existing transformer type electric energy metering device is as follows Figure 1 shown. Figure 1 In the figure, the electric energy meter and the collection terminal located above the junction box are connected to the voltage transformer (abbreviated as X-phase voltage transformer in the figure, X=A, B, C) and current transformer (abbreviated as X-phase current transformer in the figure, X=A, B, C) located below the junction box through the junction box; the rightmost group of wiring in the figure corresponds to the neutral line in the three-phase circuit, and the incoming and outgoing ends of the neutral line are directly connected.

[0061] The live metal parts on the junction box panel are exposed without any insulation shielding.

[0062] Before replacing the meter, you need to manually adjust the wiring on the junction box panel to cut off the power to the meter.

[0063] The schematic diagram of the principle of switching the meter from the measuring state to the meter replacement state is as follows Figure 2 As shown in Figure 2 It can be seen that to switch from the metering state to the meter replacement state, the secondary circuit of each phase current transformer needs to be short-circuited (because the secondary side of the current transformer cannot be open-circuited) and the voltage terminal needs to be disconnected (or disconnected, because the secondary side of the voltage transformer cannot be short-circuited), so that there is no voltage access and no current flowing between the input ends of the electric energy meter and the collection terminal.

[0064] Specifically, Figure 1 , Figure 2 In the diagram, three colors are used to represent the circuit channels of the three-phase electricity A, B, and C; the wiring mode of the electric energy metering device belongs to the metering state of the electric energy meter before the meter replacement operation ( Figure 2 In this state, move each copper sheet (white arrows in the figure indicate the moving direction of each copper sheet); by manually changing and adjusting the connection position of each copper sheet, the electrical connection relationship of each phase voltage circuit and current circuit on the junction box panel can be changed, thereby achieving Figure 2 The electrical connection relationship of the lower part puts the meter in a power-off state, realizing the switching (or conversion) of the meter replacement state (called the meter adjustment state in the figure).

[0065] exist Figure 2 In the diagram, each phase circuit is divided into two columns of terminal blocks, the left column is the voltage circuit terminal block, and the connecting piece V of each phase is moved up and down. i , the "on / off" function switching of the phase voltage circuit can be realized; the column on the right is the terminal group of the current circuit, and the "on / off" function switching of the phase current circuit can be realized by moving the connecting piece Ii of each phase left and right.

[0066] In this process, Figure 2 Taking the junction box structure shown in as an example, the meter changer needs to manually and repeatedly loosen and tighten 12 screws and move 6 copper sheets. After completing the meter change work, it is necessary to switch the state again to restore the meter from the meter change state to the metering state. Since multiple screws need to be loosened and tightened and the connecting pieces need to be moved, the meter change efficiency and operation speed of the meter changer are low. At the same time, because the junction box panel is in the open state, the metal parts of each screw and connecting piece are in an exposed state with electricity. When switching the meter state, the meter changer may accidentally touch the live parts and get an electric shock. On the other hand, if the personnel make a wiring error during this process, it will cause the transformer and other equipment to explode and cause an accident.

[0067] Specifically, before the meter replacement operation, the secondary side of the voltage transformer must be "disconnected" first, and the secondary side of the current transformer must be "short-circuited" first; after the meter replacement operation is completed, in order to ensure the normal metering function of the electric energy meter, the artificial "disconnection" state of the secondary side of the voltage transformer must be released, and the artificial "short-circuit" state of the secondary side of the current transformer must be released.

[0068] The technical idea of ​​the present invention is to adopt a product structure that can perform "one-touch" switching on the circuit and has no exposed electrical contacts in the mechanical structure, which is used to replace the connecting piece in the existing junction box and change the fixing method of the connecting piece by adjusting the screw, and change the position of the connecting piece to change the connection mode between the input and output wiring terminals, thereby finally achieving the purpose of the invention of conveniently changing the wiring mode between the input and output wiring terminals, preventing electric shock, and improving work efficiency.

[0069] 1. During the meter replacement process, the three-phase voltage and current loop functions of the energy meter are switched simultaneously:

[0070] 1. Switching principle of travel switch:

[0071] The switching principle diagram of LX19K-B travel switch is as follows Figure 3a and Figure 3b shown.

[0072] Figure 3a In the example, when the button of the travel switch is not pressed, circuit 1 is connected and circuit 2 is disconnected. The circuit connection relationship at this time is defined as the measuring state.

[0073] Figure 3b In the example, when the top button of the travel switch is pressed, circuit 2 is connected and circuit 1 is disconnected. The circuit connection relationship at this time is defined as the meter replacement state.

[0074] Based on the switching principle of the above-mentioned travel switch, the technical solution of the present invention proposes the design principle and operation process of a quick-cut electric energy meter junction box based on the switching principle of the travel switch and through a set of quick-cut mechanisms to realize the switching between the metering state and the meter replacement state of the transformer-type electric energy metering device, which is specifically described as follows.

[0075] 2. Quick-cutting mechanism design:

[0076] based on Figure 3a and Figure 3b The circuit topology of the quick-cut electric energy meter junction box of the technical solution of the present invention is proposed based on the travel switch principle shown in Figure 4 shown.

[0077] In the figure, U Xini is the voltage input terminal of phase X (X=A, B, C), U Xoutiis the i-th voltage output terminal of phase X (i=1,2); I Xini is the i-th current input terminal of phase X (X=A,B,C;i=1,2), I Xouti is the i-th current outlet terminal of phase X (X=A,B,C,i=1,2); U Nin It is the incoming terminal of the neutral line, U Xouti It is the i-th outlet terminal of the neutral line.

[0078] For a three-phase circuit, the energy meter junction box in the technical solution of the present invention has a voltage input terminal and two voltage output terminals (which can be called the first and second voltage output terminals of the X phase) for each phase; it has two current input terminals and two current output terminals; wherein the first current input terminal and the first current output terminal of the X phase constitute a first current circuit; the second current input terminal and the second current output terminal of the X phase constitute a second current circuit.

[0079] For the three-phase circuit, a switch T is set accordingly. X (X=A, B, C), the switching switch is a travel switch.

[0080] The travel switch has a pair of normally open contacts and a pair of normally closed contacts.

[0081] Connect a pair of normally closed contacts of the travel switch between the voltage input terminal of the corresponding phase and the first and second voltage output terminals;

[0082] Connect a pair of normally open contacts of the travel switch between the first current wiring terminal and the second current wiring terminal of the corresponding phase respectively;

[0083] Thus, from the perspective of circuit connection, for each phase circuit, the pair of normally closed contacts P of the corresponding travel switch Xu Connect between the voltage input terminal of the corresponding phase and the first and second voltage output terminals; a pair of normally open contacts P corresponding to the travel switch Xi Connected across the first current line and the second current line of the corresponding item.

[0084] In terms of circuit function, taking phase A as an example, when switching switch T A At voltage terminal P Au When the limit switch button is not pressed (equivalent to the case where the pair of normally closed contacts of the switch is in a closed state and the pair of normally open contacts is in a disconnected state), the A-phase voltage circuit is connected (i.e., the first voltage input terminal of the A-phase is connected to the first and second output terminals), and the A-phase current circuit is connected (since the pair of normally open contacts is disconnected, the first current circuit and the second current circuit of the A-phase are connected independently); when T A Push to the current short circuit terminal P AiWhen the A-phase voltage circuit is disconnected (because the pair of normally closed contacts of the switching switch are in the disconnected state), the meter loses power (the abbreviation of losing voltage), realizing the "disconnection" function between the voltage input terminal of the electric energy meter and the secondary output terminal of the voltage transformer; the secondary circuit of the A-phase current transformer is short-circuited (the pair of normally open contacts of the switching switch are in the closed state, short-circuiting the first current circuit and the second current circuit of the A-phase), and the current will no longer flow to the meter, ensuring the "short-circuit" function of the secondary circuit of the current transformer.

[0085] like Figure 4 and Fig.15 , Fig.16 As shown in the figure, the rightmost set of wiring corresponds to the neutral line in the three-phase circuit, and its neutral line input terminal U Nin And the first and second neutral line output terminals U Nout1 and U Nout2 A surge voltage absorption circuit 9 is connected in series.

[0086] The surge voltage absorption circuit is composed of resistors R1, R2, and diodes D1, D2, wherein the diodes D1, D2 and the resistor R2 are connected in series and then connected in parallel with the resistor R1;

[0087] Specifically, the positive electrode of the diode D1 and the first end of the resistor R1 are connected to the neutral line input terminal U Nin The cathode of the diode D1 is connected to the anode of the diode D2; the cathode of the diode D2 is connected to the first end of the resistor R2; the second end of the resistor R2 is connected in parallel with the second end of the resistor R1, and then connected to the first zero line output terminal U Nout1 And the second neutral line terminal U Nout2 Connect simultaneously.

[0088] In addition, the resistor R1 may also be a fuse or a varistor.

[0089] like Figure 5 As shown, based on Figure 4 The circuit topology diagram of the quick-cut mechanism further draws the PCB circuit board design diagram, thereby realizing the connection between the various input and output terminals of the electric energy meter and the travel switch mechanism.

[0090] The 3D structure of the quick-cut electric energy meter junction box of the present invention is shown in FIG. Figure 6 as shown in .

[0091] In the figure, 1 is the quick-cut mechanism module, 1-1 is the button of the travel switch, 2 is the linkage slide bar, 2-1 is the recessed part, 3 is the block-type locking mechanism, 4 is the incoming wiring terminal, 5 is the outgoing wiring terminal, 6 is the junction box housing, and 7 is the PVC transparent protective cover.

[0092] As can be seen from the figure, a number of incoming wiring terminals 4 and outgoing wiring terminals 5 are respectively arranged on both sides of the rectangular junction box shell 6, and three quick-cut mechanism modules 1 are arranged between the incoming wiring terminals and the outgoing wiring terminals; the three quick-cut mechanism modules are respectively arranged corresponding to the corresponding incoming wiring terminals and outgoing wiring terminals of the three-phase electricity.

[0093] Furthermore, each of the quick-cut mechanism modules is respectively arranged between the incoming line terminal 4 and the outgoing line terminal 5 of the corresponding phase.

[0094] The quick-cut mechanism module includes a travel switch.

[0095] A linkage slide bar 2 is arranged above the three quick-cut mechanism modules for synchronously controlling the actions of the quick-cut mechanism modules.

[0096] The linkage slide bar is arranged on the slideway above the buttons of the three travel switches, and the actions of the quick-cut mechanism modules are synchronously controlled through the movable sliding of the linkage slide bar.

[0097] The synchronous control of the actions of each quick-cut mechanism module includes synchronously pressing or releasing the buttons 1 - 1 of each travel switch.

[0098] Specifically, when the slide bar is pushed to the meter changing position, the buttons of each travel switch in the three-phase quick-cut mechanism are pressed down at the same time, so that Figure 4 Middle switch T A , T B , T C Move to terminal P Ai , P Bi , P Ci When the slide bar is pushed to the metering position, the button of the travel switch jumps up due to the spring action. Figure 4 Middle switch T A , T B , T C Move to terminal P Au , P Bu , P Cu so that the three phases are energized at the same time.

[0099] Further, the driving principle of the linkage slide rod to the button 1-1 of each travel switch is as follows: Figure 7a and Figure 7b As shown in FIG. 1 , a concave portion 2-1 is provided on one side of the linkage slide rod. When the linkage slide rod slides toward the metering position ( Figure 7aWhen the linkage slide bar is in the original first position (sliding to the left in the middle, or in the original first position), the buttons of the three travel switches are just embedded in the recessed parts of the linkage slide bar, and then the buttons of the three travel switches are released synchronously, and the circuit connection relationship of the junction box of the transformer type electric energy metering device is in the "metering" state.

[0100] like Figure 7b As shown in the figure, when the linkage slide bar slides to the right (as shown by the rightward red arrow in the figure) to enter the meter-changing position, the buttons of each travel switch are pressed downward by the linkage slide bar (as shown by the downward red arrow in the figure), and then the buttons of the three travel switches are pressed synchronously, the voltage circuits of each phase are disconnected, and the meter loses power; the secondary side circuits of the current transformers of each phase are short-circuited, and the circuit connection relationship of the electric energy meter junction box is in the "meter-changing" state.

[0101] At the end of the slide rod, a block-type locking mechanism 3 is provided to prevent accidental movement or misoperation by personnel.

[0102] The block-type locking mechanism is a rotatable convex block structure sleeved on the shaft (its action principle is similar to that of an eccentric cam).

[0103] Specifically, Figure 8a and Figure 8b As shown in FIG. 1 , the card-block type locking mechanism 3 is rotatably arranged at one end (also called the end) of the linkage slide bar 2. When the card block of the card-block type locking mechanism is moved in one direction ( Figure 8a When the card block is pushed in the other direction ( Figure 8b When the card block is in the locked state, the meter changer cannot push the slide bar, thus avoiding misoperation or erroneous operation during meter change.

[0104] A transparent protective cover 7 is provided above the junction box housing 6 to prevent personnel from accidentally moving the upper panel (referred to as the panel) of the junction box during daily operation.

[0105] In addition, the live parts of each component of the junction box are encapsulated with insulating materials to prevent electric shock.

[0106] The junction box shell is made by 3D printing, and the actual junction box sample developed after assembly is as follows Fig. 9 shown.

[0107] The quick-cut electric energy meter junction box of the present invention, when it is necessary to enter the meter replacement state, push the slide bar to the meter replacement position and then push the card block upward to lock the slide bar, thereby switching the metering state to the meter replacement state, and then the relevant work of the meter replacement operation procedure can be carried out.

[0108] When the meter changing work is finished and it is necessary to enter the metering state, after the card block is pushed down to unlock the slide bar, the slide bar is pushed to the metering position, so that the meter changing state is restored to the metering state.

[0109] 2. Rapid conversion of the measured electric energy meter between the calibration state and the measurement state:

[0110] In order to ensure that the accuracy and other performance of the electricity meter meet the specified requirements, the electricity meter should be calibrated and adjusted regularly to ensure normal metering work. This is common knowledge and common practice in the industry.

[0111] During the calibration work, a standard power supply is usually used to provide power to the electric energy meter under test and a standard electric energy meter. By observing the readings (or cumulative readings) of the electric energy meter under test and the standard electric energy meter within a certain period of time, the reading deviation of the two meters is obtained, and then the measurement deviation between the electric energy meter under test and the standard electric energy meter is calculated, and finally the measurement deviation of the electric energy meter under test is obtained.

[0112] Since the electric energy meters under test are usually installed on site, the test personnel usually bring standard meters to the site for comparison tests, record the experimental data, and then go back to calculate the deviation of the electric energy meters under test. Therefore, during the calibration process of the junction boxes of the electric energy meters under test installed on site, there will also be a large number of problems of screw removal and connection piece change.

[0113] 1. Verification status actuator switching principle:

[0114] The calibration state execution component (also called calibration actuator) uses a G610 micro switch (micro switch for short). Its switching principle is as follows: Fig.10a and Fig.10b as shown in .

[0115] exist Fig.10a When the electric energy meter is in the measuring state, the pressure piece YP is not pressed down, and the contact CD is in the raised state under the action of the spring. The COM terminal ① and the NC terminal ② of the micro switch are in the "on" state, and the COM terminal ① and the NO terminal ③ are in the "off" state.

[0116] exist Fig.10b When the electric energy meter switches to the calibration state, the pressure piece YP of the micro switch is pressed down, and the contact CD is pressed down. The micro switch switches from the original ①-② ends are connected and ①-③ ends are disconnected (metering state) to the ①-② ends are disconnected and ①-③ ends are connected (calibration state), completing the calibration state switching.

[0117] In this way, the above-mentioned verification state execution component (micro switch) is set between the input and output terminals in the junction box housing for switching, so that the metering state and verification state of the measured electric energy meter can be quickly switched without changing the external wiring.

[0118] Since the detection object of the meter is a three-phase four-wire system, three sets of the above-mentioned actuators need to be set up to switch simultaneously to realize the function of synchronous switching.

[0119] In order to enable the three sets of actuators to switch simultaneously and synchronously, the following quick-cut mechanism is designed.

[0120] 2. Quick-cutting mechanism design:

[0121] The verification quick-cut mechanism is composed of a verification linkage lever 6' (referred to as the verification linkage lever or lever) and a verification shift block 7' (referred to as the shift block).

[0122] See also Fig.11a Middle and Fig.11b As shown in FIG. 1 , there are three pressure heads 6-1′ ( Fig.11a and 11b Take one pressure head as an example, marked as the lever pressure head), pushing the lever can drive three micro switches to operate at the same time, realizing simultaneous and synchronous conversion of the three-phase current circuit.

[0123] The shifting block 7' is a rotatable convex block structure sleeved on the shaft (its operating principle is similar to that of an eccentric cam).

[0124] Turning the dial block clockwise can push the verification linkage lever to the inspection position and lock the verification linkage lever.

[0125] Specific, combined Fig.15 and Fig.16 As shown in the figure, when the dial block is moved in one direction, the verification linkage lever can slide up and down arbitrarily due to the lack of obstruction by the dial block, which is an unlocked state; when the dial block is moved in the other direction, the dial block just pushes up and fixes the verification linkage lever, so that the verification linkage lever cannot slide up and down freely, which is a locked state.

[0126] When the shift block is in the locked state, the operator cannot push the verification linkage shift lever, thereby avoiding accidental movement or misoperation by the operator during operation.

[0127] Specifically, Fig.15 As shown in the figure, when the check linkage lever is pushed upward to the check position, the three pressure heads of the three-phase check quick-cut mechanism press the contacts down through the pressure sheet, so that Fig.12 Middle calibration switch K A , K B , KC The incoming line (① pin) and J Ai , J Bi , J Ci (②pin) disconnected and connected to Y A , Y B , Y C (③ pin) is connected, and each phase current passes through the user meter (i.e. the electric energy meter being tested) and then connected in series to the standard meter.

[0128] 3. Circuit design:

[0129] The circuit topology design of the quick-cut electric energy junction box with verification function of the present invention is as follows Fig.12 as shown in .

[0130] Fig.12 In the measurement state (check linkage lever is at the bottom, micro switch contact is at the top), micro switch K A The incoming line and J Ai Unicom, A phase current is connected;

[0131] Verification status (verification linkage is pushed on top, pressing the micro switch contact): micro switch K A The incoming line and J Ai Disconnect, and Y A Unicom, A phase current passes through the user meter and then passes through IT Ai1 Connect the standard table and then use IT Ai2 Connect to current transformer.

[0132] Fig.13a and Fig.13b In the figure, the circuit switching process in the measurement and verification states is given.

[0133] In this technical solution, the metering state and the verification state are for the measured electric energy meter (see FIG. Fig.13a and Fig.13b As shown in the figure. It is represented by "User Table").

[0134] Will Fig.13a , Fig.13b ,and Fig.10a , Fig.10b When the electric energy meter under test is in the measuring state, the pressure piece YP is not pressed down, the "1" terminal (or pin, COM terminal) and the "2" terminal (NC terminal) of the micro switch KTI are in the connected state (referred to as ①-② terminal conduction), and the "1" terminal (COM terminal) and the "3" terminal (NO terminal) are in the disconnected state (referred to as ①-③ terminal disconnection); then the output current of the current transformer at this time is through the first incoming terminal I in1 , the first outlet terminal I out1 , flows through the current coil of the measured electric energy meter, and then passes through the second output terminal Iout2 , the "2" and "1" terminals of the micro switch KTI (also called contacts), the second incoming line terminal I in2 , return to the corresponding output terminal of the current transformer.

[0135] In other words, in this state, the output of the current transformer is sent to the electric energy meter being measured for measurement to count the corresponding electric energy parameters, so it is called the "metering state".

[0136] When the measured energy meter needs to be switched to the calibration state, the pressure piece YP of the micro switch is pressed down by the pressure head of the lever, and the contact CD is pressed down. The micro switch is switched from the original state of ①-② terminals being on and ①-③ terminals being off to ①-② terminals being off and ①-③ terminals being on, thus completing the switching of the calibration state. At this time, the output current of the current transformer is transmitted through the first incoming terminal I in1 , the first outlet terminal I out1 , flows through the current coil of the measured electric energy meter, and then passes through the second output terminal I out2 , and the first test terminal IT1 connected to the second output terminal, after flowing through the current coil of the standard electric energy meter, through the second test terminal IT2, the "2" contact and "3" contact of the micro switch KTI, and the second incoming terminal Iin2, it returns to the corresponding output terminal of the current transformer.

[0137] In this state, the output of the current transformer is sent to the electric energy meter under test and the standard electric energy meter connected in series with it, and measurement is performed simultaneously to record the electric energy parameters of the electric energy meter under test and the standard electric energy meter in the same time period. Through calculation and comparison, the measurement accuracy error between the electric energy meter under test and the standard electric energy meter can be known, and the calibration function of the electric energy meter under test can be realized, so it is called the "calibration state".

[0138] The overall structure design of the junction box is drawn by CAD. The 3D design structure of the junction box is as follows: Fig.14 as shown in .

[0139] Fig.14 The electrical topology and switching principle of the quick-cut mechanism execution module 8' are shown in Fig.12 , Fig.13a and Fig.13b .

[0140] There are three pressure heads 6-1' on the verification linkage lever 6', which are used to synchronously drive the actions of three verification switching micro switches, thereby realizing the function of synchronous verification switching.

[0141] The actual sample of the junction box and the wiring after the assembly of each mechanism component are as follows Fig.15 as shown in .

[0142] 4. Verification operation method:

[0143] like Fig.15 As shown in , during calibration, first connect the standard meter to the standard meter interface, rotate the dial block 7 upward clockwise, push the calibration linkage dial rod 6′ (referred to as the dial rod) to the calibration position, and the pressure head 6-1′ presses the pressure piece YP in the calibration actuator 8′, and the contact of the micro switch is pressed down; at this time, rotate the dial block 7′ clockwise to hold the dial rod to prevent it from moving freely up and down, thereby realizing the function of locking the dial rod, thereby realizing the switching of the metering state to the calibration state.

[0144] When it is necessary to return to the metering state, first rotate the dial block 7' counterclockwise to unlock the dial rod 6', then push the dial rod 6' downward, the pressure head 6-1' releases the pressure applied to the pressure piece YP in the verification actuator 8', the contacts of the micro switch are reset, and the metering state is restored.

[0145] See also Fig.14 As shown in FIG, a transparent protective cover 2' is provided above the junction box housing 1' to prevent personnel from accidentally moving the upper panel (referred to as the panel) of the junction box in the daily operation state.

[0146] In addition, the live parts of each component of the junction box are encapsulated with insulating materials to prevent electric shock.

[0147] Combination Fig.14 As shown in the figure, the quick-cut electric energy meter junction box of the present invention comprises a junction box housing 1', and a plurality of incoming wiring terminals 10' and outgoing wiring terminals 11' are respectively arranged on both sides of the inside of the junction box housing; the incoming wiring terminals are arranged on one side of the inside of the junction box housing, and the outgoing wiring terminals are arranged on the other side of the inside of the junction box housing;

[0148] A verification actuator 5' is provided between the incoming wiring terminal and the outgoing wiring terminal;

[0149] The verification actuator is a micro switch.

[0150] There are three micro switches, and a pressing piece is arranged on the top of each micro switch. By applying pressure to the pressing piece or releasing the pressure, the on-off mode of the normally open contact and the normally closed contact inside the micro switch can be changed.

[0151] A quick-cut calibration mechanism is arranged above the calibration actuator. By operating the quick-cut calibration mechanism, the metering state and the calibration state of the electric energy meter under test can be quickly switched without changing the external wiring.

[0152] The verification quick-cut mechanism is composed of a verification linkage lever 6' and a verification block 7'.

[0153] The shift block is a rotatable convex block structure sleeved on the shaft, and is arranged on the same plane as the verification linkage shift rod.

[0154] Turning the dial block clockwise can push the verification linkage lever to the inspection position and lock the verification linkage lever.

[0155] Specific, combined Fig.15 and Fig.16 As shown in the figure, when the dial block is moved in one direction, the verification linkage lever can slide up and down at will, which is an unlocked state; when the dial block is moved in another direction, the dial block is lifted up and fixes the verification linkage lever, so that the verification linkage lever cannot slide up and down freely, which is a locked state.

[0156] Three pressure heads 6-1' are arranged on the lever. When the lever is moved, three micro switches can be driven to operate at the same time, so as to realize simultaneous and synchronous switching of the three-phase current circuit.

[0157] Specifically, when the quick-cut junction box needs to be switched from the metering state to the verification state, follow the steps below:

[0158] 1) Check the electrical status of the junction box casing;

[0159] 2) Open the package and remove the transparent protective cover;

[0160] 3) Push the lever up to the calibration position;

[0161] 4) Rotate the lever block upward to lock the lever;

[0162] 5) Cover with a transparent protective cover;

[0163] 6) The measurement state is switched to the calibration state.

[0164] Similarly, when you need to switch the quick-cut junction box from the calibration state to the metering state, follow the steps below:

[0165] 1) Remove the transparent protective cover;

[0166] 2) Rotate the lever downward to unlock the lever;

[0167] 3) Push the lever down to the metering position;

[0168] 4) Cover with a transparent protective cover and seal it;

[0169] 5) The calibration status is restored to the measurement status.

[0170] In summary, the main innovative points of the technical solution of the present invention are summarized as follows:

[0171] 1. Innovation in operation process: It eliminates the manual repetitive assembly and disassembly actions in each link of the original process of switching the meter status, which improves the verification efficiency and reduces the error rate of manual assembly and disassembly.

[0172] 2. Innovation in physical structure: By setting up a micro-switch type quick-cut mechanism, the measured electric energy meter can be quickly switched between the metering state and the verification state; by setting up a dial-type locking mechanism, it can effectively prevent people from accidentally touching or operating it; by adopting an independent packaging mode for components, the probability of electric shock to people is reduced.

[0173] The present invention can be widely used in the fields of design, manufacture, operation and maintenance of electric energy metering devices.

Claims

1. A method for improving the speed and safety of calibration of a high-voltage electric energy metering device, characterized in that: On both sides of the junction box housing, incoming wiring terminals and outgoing wiring terminals are respectively arranged; A quick-cut mechanism module and a verification actuator are arranged between the incoming wiring terminal and the outgoing wiring terminal of each phase, forming an electric energy metering joint junction box with a quick switching function; The quick-cut mechanism module includes a travel switch with a button and at least a pair of normally open contacts and a pair of normally closed contacts, which is used to realize the rapid conversion of the measured electric energy meter between the meter replacement state and the metering state without changing the external wiring; The verification actuator comprises a micro switch with a pressure piece and at least one set of single-pole double-position contacts, which is used to realize the rapid switching of the measured electric energy meter between the metering state and the verification state without changing the external wiring; Above the quick-cut mechanism module, a linkage slide bar is provided which can slide back and forth horizontally in the junction box housing to synchronously control the actions of the three quick-cut mechanism modules; at the end of the slide bar, a card-block type locking mechanism is provided; A verification quick-cut mechanism is arranged above the verification actuator to synchronously control the actions of the three verification actuators; The verification quick-cut mechanism is composed of a verification linkage lever and a verification block; The verification linkage lever is a rectangular structural member, which can move horizontally in the junction box housing to control the action of the verification quick-cut mechanism; The verification shift block is a rotatable convex block structure sleeved on the shaft, and its rotation plane is arranged on the same plane as the verification linkage shift rod; By setting up a quick-cut mechanism module and a verification actuator, the electric energy meter under test can be quickly switched between the meter replacement state and the metering state, as well as quickly switched between the metering state and the verification state, thereby avoiding manual repetitive assembly and disassembly actions in each link during the process of switching the meter state, thereby improving the efficiency of meter replacement and reducing the error rate of manual assembly and disassembly; by setting up a card-type locking mechanism and a verification dial locking mechanism, it is effectively prevented from accidental contact and misoperation by personnel; by independently packaging the components, the probability of electric shock to personnel is reduced.

2. The method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device according to claim 1, characterized in that There are multiple incoming terminals; there are multiple outgoing terminals; The multiple incoming terminals are respectively connected to the output ends of the voltage transformer and the current transformer of each phase; the multiple outgoing terminals are correspondingly connected to the connection terminals of each phase of the electric energy meter, the collection terminal or the standard electric energy meter.

3. The method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device according to claim 1, characterized in that The linkage slide bar is arranged above the buttons of the three travel switches, and the actions of the quick-cut mechanism modules are synchronously controlled through the movable sliding of the linkage slide bar.

4. The quick-cut electric energy metering joint junction box with verification function according to claim 3 is characterized in that The synchronous control of the actions of the quick-cut mechanism modules includes synchronously pressing or releasing buttons of the travel switches.

5. The method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device according to claim 1, characterized in that There are three quick-cut check mechanisms; the quick-cut check mechanisms include a micro switch; a pressing piece is provided on the upper part of each micro switch, and by applying pressure to or releasing pressure on the pressing piece, the on-off mode of the single-pole double-position contact inside the micro switch can be changed, that is, the on-off mode of its normally open contact and normally closed contact can be changed; The verification linkage lever is arranged above the three verification quick-cut mechanisms, and three pressure heads are arranged on the lever; through the movement of the verification linkage lever, the three pressure heads synchronously control the actions of the verification quick-cut mechanisms.

6. The method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device according to claim 5, characterized in that The synchronous control of the actions of each quick-cut mechanism module includes the three pressure heads of the verification linkage lever simultaneously driving the micro switches in the three verification quick-cut mechanisms to act, synchronously pressing or releasing the pressure pieces of each micro switch, and synchronously changing the states of the normally open contacts and the normally closed contacts in the micro switches.

7. The method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device according to claim 5 is characterized in that When the pressing piece is not pressed down, the "1" terminal and the "2" terminal of the micro switch are in the connected state, and the "1" terminal and the "3" terminal are in the disconnected state; at this time, the output current of the current transformer is connected to the first incoming terminal I in1 , the first outlet terminal I out1 , flows through the current coil of the measured electric energy meter, and then passes through the second output terminal I out2 , the "2" and "1" terminals of the micro switch I, the second incoming line terminal I in2 , return to the corresponding output terminal of the current transformer; In this state, the output of the current transformer is sent to the measured electric energy meter for measurement to count the corresponding electric energy parameters; When the pressing piece is pressed down, the "1" terminal and the "2" terminal of the micro switch are in the disconnected state, and the "1" terminal and the "3" terminal are in the connected state; at this time, the output current of the current transformer is connected to the first incoming terminal I in1 , the first outlet terminal I out1 , flows through the current coil of the measured electric energy meter, and then passes through the second output terminal I out 2, and the first test terminal IT1 connected to the second outlet terminal, after flowing through the current coil of the standard electric energy meter, through the second test terminal IT2, the "2" and "3" terminals of the micro switch, and the second inlet terminal I in2 , return to the corresponding output terminal of the current transformer; In this state, the output of the current transformer is sent to the electric energy meter under test and the standard electric energy meter connected in series with it, and measurement is performed simultaneously to record the electric energy parameters of the electric energy meter under test and the standard electric energy meter in the same time period. Through calculation and comparison, the measurement accuracy error between the electric energy meter under test and the standard electric energy meter can be known, thereby realizing the calibration function of the electric energy meter under test.

8. The method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device according to claim 1 is characterized in that The block-type locking mechanism is a rotatable convex block structure mounted on the shaft; When the block of the block-type locking mechanism is moved in one direction, the linkage slide bar can slide left and right at will, which is the unlocking state; When the block of the block-type locking mechanism is moved in another direction, the block is fixed between the structural member and the linkage slide bar, so that the linkage slide bar cannot slide freely along its sliding direction, and is in a locked state.

9. The method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device according to claim 1, characterized in that When the verification dial block is moved in one direction, the verification linkage lever can slide up and down at will, and is in the unlocked state; When the verification dial block is moved toward another direction, the verification dial block is lifted up and fixes the verification linkage dial rod, so that the verification linkage dial rod cannot slide up and down freely, and is in a locked state.

10. The method for improving the speed and safety of the calibration operation of a high-voltage electric energy metering device according to claim 1, characterized in that The method for improving the speed and safety of the meter calibration operation of the high-voltage electric energy metering device realizes the rapid conversion between the meter replacement state and the metering state by adopting a quick-cut mechanism; By setting a micro switch type quick-cut mechanism, the measured electric energy meter can be quickly switched between the measurement state and the verification state; By setting travel switches and micro switches between the incoming and outgoing terminals according to the phases, the external wiring of the electric energy meter can be switched or changed by changing the state of the travel switch or micro switch, which can improve the efficiency of meter replacement and reduce the error rate of manual installation and disassembly; By setting up a card-type locking mechanism and a dial-type locking mechanism, it is effectively prevented from accidental contact or incorrect operation; by adopting an independent packaging mode for components, the probability of electric shock to personnel is reduced.

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