Quick-switching type electric energy metering combined junction box with verification function

Abstract

The invention discloses a quick-switching type electric energy metering combined junction box with a verification function, and belongs to the metering field. An incoming line wiring terminal and an outgoing line terminal are arranged in the junction box shell; the inlet wire binding post is arranged on one side in the junction box shell, and the outlet wire binding post is arranged on the other side in the junction box shell; a verification execution mechanism is arranged between the wire inlet wiring terminal and the wire outlet terminal; the verification quick-switching mechanism comprises a microswitch; a verification rapid cutting mechanism is arranged above the verification execution mechanism; the verification quick-switching mechanism is composed of a verification linkage shifting rod and a verification shifting block. The verification linkage driving lever is a rectangular structural member. The shifting block is of a rotatable convex block structure sleeved on the shaft, and the rotating plane of the shifting block and the verification linkage shifting rod are arranged on the same plane; 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, and mistaken touch and misoperation of personnel are effectively prevented.

Description

Technical Field

[0001] The invention belongs to the field of electric energy metering, and in particular relates to a combined junction box for electric energy metering. Background Art

[0002] The electric energy metering device is a metering instrument used to measure and record the amount of power generated, the amount of power supplied, the amount of power consumed by the plant, the amount of power lost by the line and the amount of power consumed by the users.

[0003] The electric energy metering device refers to the whole composed of an electric energy meter (also known as an electric meter or an electric watt-hour meter, referred to as a meter), a metering transformer (including a voltage transformer and a current transformer) and secondary connecting wires.

[0004] With the continuous advancement of optimizing the power business environment, the use of transformer-type energy metering devices has become more and more widespread. In order to ensure the safety of calibration 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.

[0005] 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.

[0006] In the secondary junction box, there are usually two rows of upper and lower terminals (terminals for short), each terminal represents a circuit connection point; usually the upper row of terminals is used to connect to the various terminals of the electric energy meter, and the lower row of terminals is used to connect to external circuits or devices; between some of the 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 realized.

[0007] In order to connect the standard meter in series during the meter calibration process, it is necessary to use a screwdriver to move the copper connection piece in the junction box to switch the meter between the metering state and the calibration state. During this process, the staff needs to repeatedly turn more than ten screws to fix and move the connection piece, which is inefficient and slow.

[0008] The wiring principle for switching the meter from the measuring state to the calibration state is as follows Figure 1 shown.

[0009] Depend on Figure 1 It can be seen that to switch from the metering state to the verification state, a standard meter current metering unit needs to be connected in series in each phase current transformer loop, so that the electric energy meter and the standard meter can measure at the same time to realize the verification of the user's electric energy meter.

[0010] During this conversion process, the staff needs to manually and repeatedly loosen and tighten six screws and move three copper sheets. After completing the calibration work, the state needs to be switched again to restore the meter from the calibration state to the measurement state.

[0011] During this process, the calibration personnel need to manually and repeatedly loosen and tighten 12 screws and move 6 copper sheets. After completing the calibration work, it is necessary to switch the state again to restore the meter from the calibration state to the metering state. Since multiple screws need to be loosened and tightened and the connecting pieces need to be moved, the calibration efficiency of the calibration personnel is low and the operation speed is slow. 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 calibration personnel may accidentally touch the live parts and get an electric shock.

[0012] To ensure operational safety, the invention patent with the authorization announcement date of 2022.01.18 and the authorization announcement number of CN 112290491 B 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 probability of electric shock caused by accidental touch by the calibration personnel. During the calibration process, it is still necessary to turn the screws and adjust the paddles in sequence to switch the operating status of the meter. This cannot improve work efficiency, and it cannot effectively avoid accidents caused by human error operations.

[0013] 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.

[0014] 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.

[0015] 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 solutions have developed 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 at the connection when moving the voltage pick, the calibration personnel still need 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.

[0016] In summary, there is an urgent need to develop an electric energy metering joint junction box that can quickly and accurately switch the meter status to replace the current manual switching method, while improving the switching efficiency, preventing people from electric shock and reducing the probability of accidents. Summary of the invention

[0017] The technical problem to be solved by the present invention is to provide a quick-cut electric energy metering joint junction box with a verification function. Based on the switching principle of the micro switch, a topological structure capable of simultaneously switching the metering and verification circuits with one key is designed. On this basis, a lever is installed to achieve simultaneous switching of three-phase circuits, and a verification dial block locking mechanism is added to prevent misoperation by personnel; at the same time, the exposed copper parts on the junction box are independently packaged to prevent electric shock to personnel.

[0018] The technical solution of the present invention is to provide a quick-cut electric energy metering combined junction box with a verification function, comprising an incoming terminal and an outgoing terminal located in a junction box housing, and is characterized in that:

[0019] On both sides of the junction box housing, incoming wiring terminals and outgoing wiring terminals are respectively arranged;

[0020] The incoming wiring terminal is arranged on one side of the inside of the junction box shell, and the outgoing wiring terminal is arranged on the other side of the inside of the junction box shell;

[0021] A verification actuator is provided between the incoming wiring terminal and the outgoing wiring terminal;

[0022] A verification quick-cut mechanism is arranged above the verification actuator to synchronously control the action of the verification actuator;

[0023] By operating the quick-cut calibration mechanism, the metering state and calibration state of the electric energy meter under test can be quickly switched without changing the external wiring.

[0024] The verification quick-cut mechanism is composed of a verification linkage lever and a verification block;

[0025] 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;

[0026] The 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;

[0027] A transparent protective cover is arranged above the junction box housing.

[0028] Specifically, there are three verification quick-cut mechanisms; the verification quick-cut mechanisms include a micro switch; a pressure piece is provided on the top of each micro switch, and the on-off mode of the normally open contacts and normally closed contacts inside the micro switch can be changed by applying pressure to or releasing pressure on the pressure piece.

[0029] Furthermore, the three quick-cut mechanism modules are respectively arranged corresponding to the positions of the corresponding incoming wiring terminals and outgoing wiring terminals of the three-phase power supply.

[0030] Specifically, 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 action of each verification quick-cut mechanism, thereby realizing rapid switching between the metering state and the verification state of the measured electric energy meter without changing the external wiring.

[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] Specifically, when the shift block is shifted in one direction, the verification linkage shift rod can slide up and down arbitrarily, and is in an unlocked state.

[0033] When the shift block is shifted toward another direction, the shift block is lifted up and fixes the verification linkage shift rod, so that the verification linkage shift rod cannot slide up and down freely, and is in a locked state.

[0034] Specifically, 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 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.

[0035] 9. The quick-cut electric energy metering joint junction box with verification function according to claim 2 is characterized in that when the pressure piece is pressed down, the "1" terminal and the "2" terminal of the micro switch are in a disconnected state, and the "1" terminal and the "3" terminal 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 Iout1 , 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, thereby realizing the calibration function of the electric energy meter under test.

[0036] The quick-cut electric energy metering joint junction box of the present invention realizes the rapid conversion of the measured electric energy meter between the metering state and the verification state by providing a micro switch type quick-cut mechanism; effectively prevents accidental contact and misoperation by personnel by providing a dial block type locking mechanism; and reduces the probability of electric shock to 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 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;

[0039] 2. The technical solution of the present invention adopts a quick-cut mechanism to realize the rapid conversion between the calibration state and the metering state, avoiding the manual repetitive assembly and disassembly actions in each link of the meter state switching process; it can effectively reduce the operation time consumption, improve the calibration work efficiency, and reduce the manual assembly and disassembly error rate;

[0040] 3. The technical solution of the present invention, by providing a block-type 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

[0041] Figure 1 This is a schematic diagram of the principle of switching the calibration state of a high-voltage meter;

[0042] Figure 2a and Figure 2b It is a schematic diagram of the switching principle of the actuator of the present invention;

[0043] Figure 3a and Figure 3b It is a schematic diagram of the driving mode of the verification linkage lever of the present invention;

[0044] Figure 4 It is a schematic diagram of the circuit topology design of the junction box of the present invention;

[0045] Figure 5a and Figure 5b It is a schematic diagram of the switching of the measurement and verification circuit of the present invention;

[0046] Figure 6 It is a three-dimensional structural schematic diagram of the junction box of the present invention;

[0047] Figure 7 It is a wiring diagram of the junction box of the present invention;

[0048] Figure 8 It is a schematic diagram of the verification operation of the junction box of the present invention.

[0049] In the figure, 1 is the junction box shell, 2 is the transparent protective cover, 3 is the meter changing linkage slide bar, 4 is the slide bar lock block, 5 is the meter changing actuator, 6 is the verification linkage lever, 6-1 is the pressure head, 7 is the verification dial block, 8 is the verification actuator, 9 is the neutral line fuse box, 10 is the incoming line terminal, and 11 is the outgoing line terminal. DETAILED DESCRIPTION

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] The technical idea of ​​the present invention is to adopt a switching product structure that can be switched 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 mode of changing the connection relationship between the input and output wiring terminals by changing the position of the connecting piece, thereby finally achieving the purpose of the invention of conveniently changing the wiring method between the input and output wiring terminals, preventing electric shock, and improving work efficiency.

[0052] 1. Actuator switching principle:

[0053] The calibration state actuator (also called calibration actuator) is a G610 micro switch (micro switch for short). Its switching principle is as follows: Figure 2a and Figure 2b as shown in .

[0054] exist Figure 2a In the metering state, the pressure piece YP is not pressed down, and the contact CD is in a 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.

[0055] exist Figure 2bIn the process of switching 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 is switched from the original state (measurement state) of ①-② ends being on and ①-③ ends being off to ①-② ends being off and ①-③ ends being on, thus completing the calibration state switching.

[0056] 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.

[0057] 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.

[0058] In order to enable the three sets of actuators to switch simultaneously and synchronously, the following quick-cut mechanism is designed.

[0059] 2. Quick-cutting mechanism design:

[0060] 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).

[0061] See also Figure 3a Middle and Figure 7 As shown in FIG. , there are three pressure heads 6-1 ( Figure 3a 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.

[0062] 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).

[0063] Turning the dial block clockwise can push the verification linkage lever to the inspection position and lock the verification linkage lever.

[0064] Specifically, 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 another 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.

[0065] 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.

[0066] Specifically, Figure 3b 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 piece, so that Figure 4Middle calibration switch K A , K B , K C 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.

[0067] 3. Circuit design:

[0068] The circuit topology design of the quick-cut electric energy junction box with verification function of the present invention is as follows Figure 4 as shown in .

[0069] Figure 4 In the measurement state (the lever is at the bottom and the micro switch contact is up), take phase A as an example: micro switch K A The incoming line and J Ai Unicom, A phase current is connected;

[0070] Verification status (the lever is pushed up, the micro switch contact is pressed down): 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.

[0071] Figure 5a and Figure 5b In the figure, a schematic diagram of the switching process of the measurement and verification circuits is given.

[0072] In this technical solution, the metering state and the verification state are for the measured electric energy meter (see Figure 5a and Figure 5b As shown in the figure. It is represented by "User Table").

[0073] Will Figure 5a and Figure 5b , combined with the figure shown in FIG2, 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 (abbreviated as ①-② terminal conduction), and the "1" terminal (COM terminal) and the "3" terminal (NO terminal) are in the disconnected state (abbreviated as ①-③ terminal disconnection); then 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 , 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.

[0074] 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".

[0075] 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.

[0076] 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".

[0077] The overall structure design of the junction box is drawn by CAD. The 3D design structure of the junction box is as follows: Figure 6 as shown in .

[0078] Figure 6 For the electrical topology and switching principle of the quick-cut mechanism execution module 8, refer to Figure 3a , Figure 3b and Figure 4 .

[0079] 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.

[0080] The actual sample of the junction box and the wiring after the assembly of each mechanism component are as follows Figure 7 as shown in .

[0081] 4. Verification operation method:

[0082] like Figure 8 As shown in , during calibration, first connect the standard meter to the standard meter interface, rotate the dial block 7 clockwise upward, push the calibration linkage lever 6 (referred to as the lever) to the calibration position, and the pressure head 6-1 presses the pressure piece YP in the calibration actuator 8 (see Figures 2a to 3b ,as well as Figure 7 , Figure 8 At this time, the dial block 7 is rotated clockwise to hold the dial rod, preventing it from moving up and down freely, thereby realizing the function of locking the dial rod, thereby realizing the switching of the metering state to the verification state.

[0083] When it is necessary to return to the metering state, first rotate the dial block 7 counterclockwise to unlock the lever 6, and then push the lever 6 downward. The pressure head 6-1 releases the pressure applied to the pressure piece YP in the calibration actuator 8, and the contacts of the micro switch are reset to return to the metering state.

[0084] See also Figure 6 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 under normal operation.

[0085] In addition, the live parts of each component of the junction box are encapsulated with insulating materials to prevent electric shock.

[0086] In summary, the quick-cut electric energy metering combined junction box of the present invention comprises a junction box housing, and a plurality of incoming wiring terminals and outgoing wiring terminals 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;

[0087] A verification actuator is provided between the incoming wiring terminal and the outgoing wiring terminal;

[0088] The verification actuator is a micro switch.

[0089] 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.

[0090] 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.

[0091] The verification quick-cut mechanism is composed of a verification linkage lever and a verification block.

[0092] 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.

[0093] Turning the dial block clockwise can push the verification linkage lever to the inspection position and lock the verification linkage lever.

[0094] Specifically, when the dial block is moved in one direction, the verification linkage lever can slide up and down arbitrarily, 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.

[0095] There are three pressure heads on the lever. When the lever is pushed, three micro switches can be driven to operate at the same time, thereby realizing simultaneous and synchronous switching of the three-phase current circuit.

[0096] Specifically, when the quick-cut junction box needs to be switched from the metering state to the verification state, follow the steps below:

[0097] 1) Check the electrical status of the junction box casing;

[0098] 2) Open the package and remove the transparent protective cover;

[0099] 3) Push the lever up to the calibration position;

[0100] 4) Rotate the lever block upward to lock the lever;

[0101] 5) Cover with a transparent protective cover;

[0102] 6) The measurement state is switched to the calibration state.

[0103] Similarly, when you need to switch the quick-cut junction box from the calibration state to the metering state, follow the steps below:

[0104] 1) Remove the transparent protective cover;

[0105] 2) Rotate the lever downward to unlock the lever;

[0106] 3) Push the lever down to the metering position;

[0107] 4) Cover with a transparent protective cover and seal;

[0108] 5) The calibration status is restored to the measurement status.

[0109] In summary, the main innovative points of the technical solution of the present invention are summarized as follows:

[0110] 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.

[0111] 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.

[0112] The present invention can be widely used in the fields of design, manufacture, operation and maintenance of high-voltage electric energy metering devices.

Claims

1. A quick-cut electric energy metering joint junction box with a verification function, comprising an incoming terminal and an outgoing terminal located in a junction box housing, characterized in that: On both sides of the junction box housing, incoming wiring terminals and outgoing wiring terminals are respectively arranged; The incoming wiring terminal is arranged on one side of the inside of the junction box shell, and the outgoing wiring terminal is arranged on the other side of the inside of the junction box shell; A verification actuator is arranged between the incoming wiring terminal and the outgoing wiring terminal; the verification quick-cut mechanism includes a micro switch; A verification quick-cut mechanism is arranged above the verification actuator to synchronously control the action of the verification actuator; By operating the quick-cut calibration mechanism, the metering state and calibration state of the measured electric energy meter can be quickly switched without changing the external wiring. 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 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; A transparent protective cover is arranged above the junction box housing.

2. The quick-cut electric energy metering joint junction box with verification function according to claim 1 is 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 top of each micro switch. By applying pressure or releasing pressure on the pressing piece, the on-off mode of the normally open contact and the normally closed contact inside the micro switch can be changed.

3. The quick-cut electric energy metering joint junction box with verification function according to claim 2 is characterized in that The three quick-cut mechanism modules are respectively arranged corresponding to the positions of the corresponding incoming wiring terminals and outgoing wiring terminals of the three-phase power supply.

4. The quick-cut electric energy metering joint junction box with verification function according to claim 1 is characterized in that 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 each verification quick-cut mechanism, thereby realizing rapid switching between the metering state and the verification state of the measured electric energy meter without changing the external wiring.

5. The quick-cut electric energy metering joint junction box with verification function according to claim 4 is 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.

6. The quick-cut electric energy metering joint junction box with verification function according to claim 1 is characterized in that When the shift block is shifted in one direction, the check linkage shift lever can slide up and down arbitrarily, and is in an unlocked state.

7. The quick-cut electric energy metering joint junction box with verification function according to claim 1 is characterized in that When the shift block is shifted toward another direction, the shift block is lifted up and fixes the verification linkage shift rod, so that the verification linkage shift rod cannot slide up and down freely, and is in a locked state.

8. The quick-cut electric energy metering joint junction box with verification function according to claim 2 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 electric energy meter under test for measurement to count the corresponding electric energy parameters.

9. The quick-cut electric energy metering joint junction box with verification function according to claim 2 is characterized in that 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.

10. The quick-cut electric energy metering joint junction box with verification function according to claim 1 is characterized in that The quick-cut electric energy metering joint junction box can realize the rapid conversion of the electric energy meter under test between the metering state and the verification state by setting a micro switch type quick-cut mechanism; can effectively prevent accidental contact and misoperation by personnel by setting a dial block type locking mechanism; and can reduce the probability of electric shock by personnel by adopting an independent packaging mode for components.

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