A quick cut type electric energy metering combined junction box with checking function

Abstract

The utility model provides a kind of jointing box of quick cut type electric energy measurement with check function, belong to measurement field.In the jointing box shell, setting incoming line terminal and outgoing terminal;Incoming line terminal is set in the inside one side of jointing box shell, and outgoing terminal is set in the inside other side of jointing box shell;Between incoming line terminal and outgoing terminal, setting a check execution mechanism;Check quick cut mechanism includes microswitch;Check quick cut mechanism is set in the top of check execution mechanism;Check quick cut mechanism is composed of check linkage lever and check block;Check linkage lever is rectangular structure piece;Block is rotatable protruding block structure of being suitably worn on shaft, and its rotation plane is set on the same plane with check linkage lever;By the operation of check quick cut mechanism, it can be realized that the measurement state and check state of measured electric energy meter are switched quickly under the premise that external wiring does not change, effectively prevent personnel from mistaken touch, mistaken operation.

Description

Technical Field

[0001] This invention belongs to the field of electricity metering, and particularly relates to a combined junction box for electricity metering. Background Technology

[0002] Electricity metering devices are instruments used to measure and record electricity generation, electricity supply, plant power consumption, line loss, and user power consumption.

[0003] An electricity metering device refers to a whole consisting of an electricity meter (also known as an energy meter or watt-hour meter, or simply a meter), metering transformers (including voltage transformers and current transformers), and secondary connecting wires.

[0004] With the continuous advancement of optimizing the electricity business environment, the use of instrument transformer-type electricity metering devices is becoming increasingly widespread. To ensure the safety of calibration personnel, it is necessary to install an electricity metering junction box in the secondary circuit to connect the instrument transformer with electricity meters, data acquisition terminals, and other equipment.

[0005] The combined junction box for electricity metering (also known as a secondary junction box) is a component of an electricity metering device, used to connect the electricity metering device to an external circuit.

[0006] In a secondary junction box, there are usually two rows of terminals (referred to as terminals) on the top and bottom. Each terminal represents a circuit contact. The top row of terminals is usually used to connect to the various terminals of the electricity meter, and the bottom row of terminals is used to connect to external circuits or devices. Between some terminals on the top and bottom rows, there are detachable connecting copper pieces (referred to as connecting pieces). By tightening or loosening these different connecting pieces with screws, the electrical connection between the terminals on the top and bottom rows can be achieved, realizing different circuit functions.

[0007] To enable the connection of a standard meter during the meter calibration process, the connecting copper plates in the junction box need to be moved using a screwdriver to switch the metering and calibration modes of the electricity meter. During this process, workers need to repeatedly tighten and loosen more than ten screws to secure and move the connecting plates, resulting in low efficiency and slow operation.

[0008] The wiring principle for switching a meter from metering mode to calibration mode is as follows: Figure 1 As shown.

[0009] Depend on Figure 1 It is known that to switch from metering mode to calibration mode, a standard meter current metering unit needs to be connected in series in each phase current transformer circuit, so that the energy meter and the standard meter can measure at the same time, thereby realizing the calibration of the user's energy meter.

[0010] During this conversion process, staff need to manually loosen and tighten six screws and move three copper plates repeatedly. After the calibration is completed, the meter needs to be switched back to the metering state.

[0011] During this process, the calibration personnel need to manually loosen and tighten 12 screws and move 6 copper plates repeatedly. After completing the calibration, the state needs to be switched again to restore the meter from calibration state to metering state. Because of the need to loosen and tighten multiple screws and move the connecting plates, the calibration personnel's efficiency is low and the work speed is slow. At the same time, because the junction box panel is open, the metal parts of the screws and connecting plates are exposed and live, making it easy for the calibration personnel to accidentally touch live parts and suffer electric shock during the meter state switching process.

[0012] To ensure operational safety, an invention patent with authorization announcement date of January 18, 2022, and authorization announcement number CN 112290491 B, discloses "Anti-accidental contact insulation device for a combined junction box for electricity metering." The device includes a shielding body, which is a cuboid structure used to cooperate with the metering box and shield the live terminals inside the box. The shielding body is equipped with a voltage protection component, which includes a first partition plate and a second and third partition plate connected to both ends of the first partition plate. The voltage protection component is U-shaped. The first partition plate is fitted between the voltage terminal and the voltage connector; the second and third partition plates are fitted on both sides of the voltage terminal. The shielding body also has a connecting part for connecting to the metering box. This technical solution, by placing a partition plate between the voltage terminal and the voltage connector, clearly disconnects the voltage terminal and the voltage connector, preventing the voltage connector from connecting to the voltage terminal and causing electric shock to workers. However, this device only reduces the probability of electric shock caused by accidental contact by calibration personnel. During the calibration process, it is still necessary to turn the screws and adjust the dials to switch the meter's operating status in sequence, which cannot improve work efficiency and cannot effectively prevent accidents caused by human error.

[0013] The invention patent CN 113820523 B, with an authorization announcement date of April 5, 2024, discloses "a high-efficiency power metering junction box," comprising a box body and a box cover, with several wiring holes inside the box body; a rotating connection unit is disposed within the wiring holes, including a telescopic component and a rotating component; the telescopic component includes a first sleeve, a second sleeve, and an elastic element, and the rotating component includes a rotating core, a limiting element, and a locking element; the second sleeve slides axially within the first sleeve, and the sliding of the second sleeve drives the rotating core to rotate within the second sleeve; the first sleeve, the second sleeve, and the rotating core are concentric. This technical solution provides a three-phase three-wire power metering junction box with a rotating element by embedding components such as a rotating core, a limiting element, a locking element, and a telescopic component within the junction box, which can effectively reduce the workload of personnel when switching meter states and improve work efficiency. However, its rotating unit is prone to jamming and failure to rotate during operation, causing meter state switching failure during operation.

[0014] Patent application CN 111650411 A, published on September 11, 2020, discloses "a combined junction box and energy metering device," including a box body and current terminals, voltage terminals, current connecting pieces, voltage connecting pieces, voltage circuits, current circuits, and test holes disposed on the box body. The current and voltage terminals are used for connection to external cables. Test holes are respectively disposed on the voltage and current circuits, and can be electrically connected to the test leads of external testing instruments to test the voltage and current circuits on the box body. An inclined conductive elastic piece is disposed within the test hole to clamp the test lead connector inserted into the test hole. This improved the installation stability of the test lead connector and enhanced testing safety by using the inclined conductive elastic piece within the test hole to clamp the test lead connector. However, this modification does not effectively solve the problem of needing manual switching of the meter's operating status.

[0015] In addition, a utility model patent with authorization announcement date of September 24, 2014 and authorization announcement number CN 203850784 U discloses a "combined junction box for electricity meter with voltage connecting piece that does not disengage when switching on and off"; another utility model patent with authorization announcement date of September 24, 2014 and authorization announcement number CN 203850785 U discloses a "guillotine switch type voltage connecting piece for combined junction box for electricity meter". The above technical solutions have developed a metering combined junction box with voltage connecting piece that does not disengage when switching on and off by modifying the voltage connecting piece structure inside the junction box. Although this modification method can effectively solve the problems of difficulty in connecting and easy generation of sparks when moving the voltage connecting piece, the calibration personnel still need to manually adjust the current loop wiring, which also cannot avoid problems such as human error and accidental contact with live parts.

[0016] In summary, there is an urgent need to develop a combined junction box for electricity metering that can quickly and accurately switch meter status to replace the current manual switching method. This would improve switching efficiency, prevent electric shock to personnel, and reduce the probability of accidents. Summary of the Invention

[0017] The technical problem to be solved by this invention is to provide a quick-switch combined power metering junction box with verification function. Based on the switching principle of microswitches, it is designed with a topology that can simultaneously switch the metering and verification circuits with one button. On this basis, a toggle lever is installed to realize the simultaneous switching of the three-phase circuit, and a verification toggle block locking mechanism is added to prevent accidental operation. At the same time, the exposed copper components on the junction box are independently encapsulated to avoid electric shock.

[0018] The technical solution of this invention is: to provide a quick-switch power metering junction box with verification function, including an inlet terminal and an outlet terminal located inside the junction box housing, characterized in that:

[0019] Inlet terminals and outlet terminals are respectively provided on both sides inside the junction box housing;

[0020] The incoming terminal is located on one side inside the junction box housing, and the outgoing terminal is located on the other side inside the junction box housing.

[0021] A verification mechanism is provided between the incoming terminal and the outgoing terminal; the verification mechanism is a micro switch; there are three micro switches, and each micro switch has a pressure plate on its upper part;

[0022] Above the verification execution mechanism, a verification quick-switching mechanism is set up to synchronously control the actions of the verification execution mechanism;

[0023] The aforementioned verification quick-cutting mechanism consists of a verification linkage lever and a verification lever block;

[0024] The aforementioned verification linkage lever is a rectangular structural component that can move horizontally within the junction box housing to control the action of the verification quick-switching mechanism;

[0025] The aforementioned verification linkage lever is positioned above the three verification actuators, and three pressure heads are mounted on the lever; by moving the verification linkage lever, the three pressure heads synchronously control the actions of each verification actuator.

[0026] By operating the verification quick-switch mechanism, the metering and verification states of the tested energy meter can be quickly switched without changing the external wiring; thus realizing the functional switching between the metering and verification states of the tested energy meter.

[0027] The aforementioned lever is a rotatable protrusion structure mounted on a shaft, and its rotation plane is set on the same plane as the verification linkage lever.

[0028] A transparent protective cover is installed on the top of the junction box housing.

[0029] Specifically, the aforementioned verification quick-cut mechanism can change the on / off mode of the normally open and normally closed contacts inside the micro switch by applying or releasing pressure to the pressure plate.

[0030] Furthermore, the three verification execution mechanisms are respectively set to correspond to the positions of the corresponding incoming and outgoing terminals of the three-phase power supply; the three verification execution mechanisms switch simultaneously to achieve synchronous switching; the simultaneous switching of the three verification execution mechanisms includes the three pressure heads of the verification linkage lever simultaneously driving the microswitches in the three verification execution mechanisms to operate, synchronously pressing down or releasing the pressure plates of each microswitch, and synchronously changing the state of the normally open and normally closed contacts in the microswitches.

[0031] Specifically, the synchronous control of the actions of each verification actuator includes the three pressure heads of the verification linkage lever simultaneously driving the microswitches in the three verification actuators to operate, synchronously pressing down or releasing the pressure plates of each microswitch, and synchronously changing the state of the normally open and normally closed contacts in the microswitches.

[0032] Specifically, when the toggle block is moved in one direction, the verification linkage lever can slide freely up and down, which is the unlocked state; when the toggle block is moved in another direction, the toggle block is lifted up and locked, preventing the verification linkage lever from sliding freely up and down, which is the locked state.

[0033] Furthermore, when the pressure plate is not pressed down, the micro switch is in a connected state between terminals "1" and "2", and in a disconnected state between terminals "1" and "3"; at this time, the output current of the current transformer flows through the first input terminal I. in1 First outgoing terminal I out1 After flowing through the current coil of the energy meter being tested, the current passes through the second output terminal I. out2 The "2" and "1" terminals of micro switch I, and the second input terminal I. in2 The current transformer returns to its corresponding output terminal; in this state, the output of the current transformer is sent to the energy meter being measured for measurement, in order to statistically analyze the corresponding energy parameters.

[0034] Furthermore, when the pressure plate is pressed down, the micro switch is in an open state between terminals "1" and "2", and in a closed state between terminals "1" and "3"; at this time, the output current of the current transformer flows through the first input terminal I. in1 First outgoing terminal Iout1 After flowing through the current coil of the energy meter being tested, the current passes through the second output terminal I. out 2. The current flows through the standard energy meter's current coil, and then through the first test terminal IT1 connected to the second outgoing terminal, the "2" and "3" terminals of the micro switch, and the second incoming terminal I. in2 Returning to the corresponding output terminal of the current transformer, in this state, the output of the current transformer is sent to the energy meter under test and the standard energy meter connected in series with it, and the metering is performed simultaneously to record the energy parameters of the energy meter under test and the standard energy meter within the same time period. By calculation and comparison, the measurement accuracy error between the energy meter under test and the standard energy meter can be known, thus realizing the verification function of the energy meter under test.

[0035] The quick-switch power metering junction box of this invention enables rapid switching between metering and verification states of the measured power meter by setting a verification execution mechanism; effectively prevents accidental contact or operation by setting a toggle-type locking mechanism; and reduces the probability of electric shock by using an independent packaging mode for the components.

[0036] Compared with the prior art, the advantages of the present invention are:

[0037] 1. Using the technical solution of this invention, when it is necessary to enter the calibration state, push the lever to the calibration position and then turn the lever up to lock the lever, thereby easily switching the metering state to the calibration state; when it is necessary to enter the metering state, turn the lever down to unlock the lever and then push the lever to the metering position, thereby restoring the calibration state to the metering state. The entire switching operation is simple and convenient.

[0038] 2. The technical solution of the present invention adopts a quick-switching mechanism to realize the rapid conversion between the verification state and the metering state, avoiding the manual repetitive installation and disassembly actions in each step during the switching of meter states; it can effectively reduce the operation time, improve the verification efficiency, and reduce the error rate of manual installation and disassembly.

[0039] 3. The technical solution of the present invention, by setting a toggle-type locking mechanism and by independently encapsulating the components, can effectively prevent accidental contact or misoperation by personnel, and reduce the probability of electric shock. Attached Figure Description

[0040] Figure 1 is a schematic diagram of the high-voltage meter calibration status switching principle;

[0041] Figure 2a and Figure 2b This is a schematic diagram illustrating the switching principle of the actuator of the present invention;

[0042] Figure 3a and Figure 3bThis is a schematic diagram of the driving mode of the verification linkage lever of the present invention;

[0043] Figure 4 This is a schematic diagram of the circuit topology design of the junction box of the present invention;

[0044] Figure 5a and Figure 5b This is a schematic diagram of the switching between the metering and verification circuits of this invention;

[0045] Figure 6 This is a three-dimensional structural diagram of the junction box of the present invention;

[0046] Figure 7 This is a wiring diagram of the junction box of the present invention;

[0047] Figure 8 This is a schematic diagram of the verification operation of the junction box of the present invention.

[0048] In the diagram, 1 is the junction box housing, 2 is the transparent protective cover, 3 is the meter replacement linkage slide bar, 4 is the slide bar locking block, 5 is the meter replacement actuator, 6 is the verification linkage lever, 6-1 is the pressure head, 7 is the verification lever, 8 is the verification actuator, 9 is the neutral wire fuse box, 10 is the incoming terminal, and 11 is the outgoing terminal. Detailed Implementation

[0049] The invention will now be further described with reference to the accompanying drawings.

[0050] The technical concept of this 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, to replace the connecting piece in the existing junction box and the fixing method of the connecting piece by adjusting the screw. It changes the mode of changing the connection relationship between the incoming and outgoing terminals by changing the position of the connecting piece, and finally achieves the invention objective of not only being able to conveniently change the wiring method between the incoming and outgoing terminals, but also preventing electric shock and improving work efficiency.

[0051] 1. Principle of actuator switching:

[0052] The verification status execution component (also known as the verification execution mechanism) is a G610 micro switch (or simply micro switch), and its switching principle is as follows: Figure 2a and Figure 2b As shown in the image.

[0053] exist Figure 2a In the metering state, the pressure plate YP is not pressed down, and the contact CD is in the raised state under the action of the spring. The micro switch is in the "connected" state between the COM terminal ① and the NC terminal ②, and in the "disconnected" state between the COM terminal ① and the NO terminal ③.

[0054] exist Figure 2bWhen switching to the calibration state, the pressure plate YP of the micro switch is pressed down, and the contact CD is pressed down. The micro switch changes from the original state where terminals ①-② are on and terminals ①-③ are off (metering state) to the state where terminals ①-② are off and terminals ①-③ are on, thus completing the calibration state switching.

[0055] Thus, by setting the aforementioned verification status execution component (micro switch) between the inlet and outlet terminals inside the junction box housing for switching, the metering status and verification status of the measured energy meter can be quickly switched without changing the external wiring.

[0056] Since the meter is used to detect three-phase four-wire systems, three sets of the aforementioned actuators need to be set up to switch simultaneously in order to achieve the function of synchronous switching.

[0057] To enable the three actuators to switch simultaneously and synchronously, the following quick-switching mechanism was designed.

[0058] 2. Quick-cutting mechanism design:

[0059] The verification quick-cutting mechanism consists of a verification linkage lever 6 (referred to as the verification linkage lever or lever) and a verification block 7 (referred to as the block).

[0060] See Figure 3a China and Figure 7 As shown, lever 6 has three pressure heads 6-1 ( Figure 3a Taking one pressure head as an example (labeled as lever pressure head), pushing the lever can simultaneously drive three micro switches to achieve simultaneous and synchronous conversion of the three-phase current circuit.

[0061] The aforementioned lever 7 is a rotatable protrusion structure mounted on a shaft (its operating principle is similar to that of an eccentric cam).

[0062] Rotating the lever clockwise will move the calibration linkage lever to the calibration position and lock it in place.

[0063] Specifically, when the lever is moved in one direction, the verification linkage lever can slide freely up and down without the lever's obstruction, which is the unlocked state; when the lever is moved in the other direction, the lever is pushed up and locked, preventing the verification linkage lever from sliding freely up and down, which is the locked state.

[0064] When the lever is in the locked state, the operator cannot push the verification linkage lever, thus avoiding accidental movement or misoperation during operation.

[0065] Specifically, Figure 3b In the process, when the verification linkage lever is pushed upward to the verification position, the three pressure heads of the three-phase verification quick-cut mechanism press down the contacts through the pressure plates, causing... Figure 4Intermediate verification switch K A K B K C The incoming line (pin ①) and J Ai J Bi J Ci (② foot) disconnected, and connected to Y A Y B Y C (③) Connect the current of each phase through the user meter (i.e. the energy meter being measured) and then connect it in series with the standard meter.

[0066] 3. Circuit Design:

[0067] The circuit topology design of the fast-switching power junction box with verification function described in this invention is as follows: Figure 4 As shown in the image.

[0068] Figure 4 In the example of phase A, the metering status (the lever is at the bottom, and the microswitch contact is popped up): Microswitch K A The incoming line and J Ai The current in phase A is connected;

[0069] Verification status (lever pushed up, micro switch contacts pressed down): Micro switch K A The incoming line and J Ai Disconnect, with Y A The current in phase A passes through the user meter and then through IT. Ai1 Connect to standard tables, and then through IT Ai2 Connect to the current transformer.

[0070] Figure 5a and Figure 5b The diagram illustrates the switching process between the metering and calibration circuits.

[0071] In this technical solution, the metering status and calibration status mentioned are both for the measured energy meter (see [link]). Figure 5a and Figure 5b As shown in the diagram (represented by the "User Table").

[0072] Will Figure 5a and Figure 5b Combined with Figure 2, when the measured energy meter is in metering mode, the pressure plate YP is not depressed, and the "1" terminal (or pin, COM terminal) of the micro switch KTI is in a connected state with the "2" terminal (NC terminal) (referred to as ①-② terminal conduction), while the "1" terminal (COM terminal) and the "3" terminal (NO terminal) are in a disconnected state (referred to as ①-③ terminal disconnection); at this time, the output current of the current transformer flows through the first input terminal I. in1 First outgoing terminal I out1After flowing through the current coil of the energy meter being tested, the current passes through the second output terminal I. out2 The micro switch KTI has terminals "2" and "1" (also known as contacts) and the second input terminal I. in2 Return to the corresponding output terminal of the current transformer.

[0073] In other words, in this state, the output of the current transformer is sent to the energy meter being measured for measurement, so as to statistically analyze the corresponding energy parameters; hence, it is called the "metering state".

[0074] When the energy meter under test needs to be switched to calibration mode, the pressure plate 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 changes from the original state where terminals ①-② are conducting and terminals ①-③ are open to the state where terminals ①-② are open and terminals ①-③ are conducting, completing the switching of calibration mode. At this time, the output current of the current transformer flows through the first input terminal I. in1 First outgoing terminal I out1 After flowing through the current coil of the energy meter being tested, the current passes through the second output terminal I. out2 The current flows through the standard energy meter's current coil, then through the second test terminal IT2, the "2" and "3" contacts of the micro switch KTI, and the second input terminal Iin2, before returning to the corresponding output terminal of the current transformer.

[0075] In this state, the output of the current transformer is sent to the energy meter under test and the standard energy meter connected in series with it, and the measurement is performed simultaneously to record the energy parameters of the energy meter under test and the standard energy meter within the same time period. By calculation and comparison, the measurement accuracy error between the energy meter under test and the standard energy meter can be known, which can realize the verification function of the energy meter under test, hence it is called "verification state".

[0076] The overall structural design of the junction box was drawn using CAD, and the 3D design structure of the junction box is as follows: Figure 6 As shown in the image.

[0077] Figure 6 For details on the electrical topology and switching principle of the fast-switching mechanism execution module 8, please refer to [link / reference]. Figure 3a , Figure 3b and Figure 4 .

[0078] There are three pressure heads 6-1 on the verification linkage lever 6, which are used to synchronously drive the action of the three verification switching micro switches, thereby realizing the function of synchronous verification switching.

[0079] The assembled junction box sample and wiring are shown below. Figure 7 As shown in the image.

[0080] 4. Verification operation method:

[0081] like Figure 8 As shown, during verification, first connect the standard meter to the standard meter interface, rotate the dial 7 clockwise upwards, and push the verification linkage lever 6 (hereinafter referred to as the lever) to the verification position. The pressure head 6-1 presses down on the pressure plate YP in the verification execution mechanism 8 (see...). Figures 2a to 3b ,as well as Figure 7 , Figure 8 (As shown in the action process), the contacts of the micro switch are pressed down; at this time, the dial 7 is rotated clockwise to block the lever and prevent it from moving freely up and down, thereby realizing the function of locking the lever and thus realizing the switching from the metering state to the calibration state.

[0082] When it is necessary to return to the metering state, first rotate the lever 7 counterclockwise to unlock the lever 6, then push the lever 6 down, the pressure head 6-1 releases the pressure applied to the pressure plate YP in the calibration actuator 8, the micro switch contacts reset, and the metering state is restored.

[0083] See Figure 6 As shown, a transparent protective cover 2 is provided above the junction box housing 1 to prevent personnel from accidentally touching the top panel (hereinafter referred to as the panel) of the junction box during normal operation.

[0084] In addition, all live parts of the junction box are encapsulated with insulating materials to prevent electric shock.

[0085] In summary, the quick-switch power metering junction box of the present invention includes a junction box shell, and several inlet terminals and outlet terminals are respectively provided on both sides inside the junction box shell; the inlet terminals are located on one side inside the junction box shell, and the outlet terminals are located on the other side inside the junction box shell.

[0086] A verification mechanism is installed between the incoming and outgoing terminals;

[0087] The verification execution mechanism is a micro switch.

[0088] The micro switch has three components, each with a pressure plate on its upper part. By applying or releasing pressure to the pressure plate, the on / off mode of the normally open and normally closed contacts inside the micro switch can be changed.

[0089] A quick-switch mechanism is installed above the calibration actuator. By operating the quick-switch mechanism, the metering and calibration states of the tested energy meter can be quickly switched without changing the external wiring.

[0090] The aforementioned verification quick-cutting mechanism consists of a verification linkage lever and a verification lever block.

[0091] The aforementioned lever is a rotatable protrusion structure mounted on a shaft, and it is located on the same plane as the calibration linkage lever.

[0092] Rotating the lever clockwise will move the calibration linkage lever to the calibration position and lock it in place.

[0093] Specifically, when the lever is moved in one direction, the verification linkage lever can slide freely up and down, which is the unlocked state; when the lever is moved in another direction, the lever is pushed up and locked, preventing the verification linkage lever from sliding freely up and down, which is the locked state.

[0094] The lever is equipped with three pressure heads. Moving the lever can simultaneously activate three micro switches, enabling simultaneous and synchronous switching of the three-phase current circuit.

[0095] Specifically, when switching the quick-connect junction box from metering mode to calibration mode, follow these steps:

[0096] 1) Test the junction box casing for voltage;

[0097] 2) Open the package and remove the transparent protective cap;

[0098] 3) Push the lever up to the calibration position;

[0099] 4) Rotate the lever upwards to lock the lever;

[0100] 5) Cover with the transparent protective cover;

[0101] 6) Switch the metering status to the calibration status.

[0102] Similarly, when it is necessary to switch the quick-switch junction box from calibration mode to metering mode, follow these steps:

[0103] 1) Remove the transparent protective cover;

[0104] 2) Rotate the lever downwards to unlock it;

[0105] 3) Push the lever down to the metering position;

[0106] 4) Cover with the transparent protective cap and seal it;

[0107] 5) The calibration status is restored to the metering status.

[0108] In summary, the main innovative points of the technical solution of this invention are summarized as follows:

[0109] 1. Innovative Operation Process: The manual repetitive installation and disassembly actions in each step of the original meter status switching process have been eliminated, which improves the verification efficiency while reducing the error rate of manual installation and disassembly.

[0110] 2. Innovations in physical structure: By setting up a micro-switch-type quick-switching mechanism, the measured energy meter can be quickly switched between metering and calibration states; by setting up a toggle-type locking mechanism, accidental contact and misoperation by personnel are effectively prevented; by adopting an independent packaging mode for components, the probability of electric shock to personnel is reduced.

[0111] This invention can be widely used in the design, manufacturing, operation and maintenance of high-voltage power metering devices.

Claims

1. A quick-switch power metering junction box with verification function, comprising an inlet terminal and an outlet terminal located within the junction box housing, characterized in that: Inlet terminals and outlet terminals are respectively provided on both sides inside the junction box housing; The incoming terminal is located on one side inside the junction box housing, and the outgoing terminal is located on the other side inside the junction box housing. A verification mechanism is provided between the incoming terminal and the outgoing terminal; the verification mechanism is a micro switch; there are three micro switches, and each micro switch has a pressure plate on its upper part; Above the verification execution mechanism, a verification quick-switching mechanism is set up to synchronously control the actions of the verification execution mechanism; The aforementioned verification quick-cutting mechanism consists of a verification linkage lever and a verification lever block; The aforementioned verification linkage lever is a rectangular structural component that can move horizontally within the junction box housing to control the action of the verification quick-switching mechanism; The aforementioned verification linkage lever is positioned above the three verification actuators, and three pressure heads are mounted on the lever; by moving the verification linkage lever, the three pressure heads synchronously control the actions of each verification actuator. By operating the verification quick-switch mechanism, the metering and verification states of the tested energy meter can be quickly switched without changing the external wiring; thus realizing the functional switching between the metering and verification states of the tested energy meter. The aforementioned lever is a rotatable protrusion structure mounted on a shaft, and its rotation plane is set on the same plane as the verification linkage lever. A transparent protective cover is installed on the top of the junction box housing.

2. The quick-switch power metering junction box with verification function according to claim 1, characterized in that: The aforementioned verification quick-cut mechanism can change the on / off mode of the normally open and normally closed contacts inside the micro switch by applying or releasing pressure to the pressure plate.

3. The quick-switch power metering junction box with verification function according to claim 2, characterized in that: The three verification actuators are respectively set at the corresponding positions of the incoming and outgoing terminals of the three-phase power supply; The three verification execution mechanisms are switched simultaneously to achieve synchronous switching. The three verification actuators switch simultaneously, including the three pressure heads of the verification linkage lever simultaneously driving the microswitches in the three verification actuators to operate, synchronously pressing down or releasing the pressure plates of each microswitch, and synchronously changing the state of the normally open and normally closed contacts in the microswitches.

4. The quick-switch power metering junction box with verification function according to claim 1, characterized in that: The aforementioned synchronous control of the actions of each verification actuator includes the three pressure heads of the verification linkage lever simultaneously driving the microswitches in the three verification actuators to operate, synchronously pressing down or releasing the pressure plates of each microswitch, and synchronously changing the state of the normally open and normally closed contacts within the microswitches.

5. The quick-switch power metering junction box with verification function according to claim 1, characterized in that: When the toggle block is moved in one direction, the verification linkage lever can slide up and down arbitrarily, indicating an unlocked state.

6. The quick-switch power metering junction box with verification function according to claim 1, characterized in that: When the dial is moved in another direction, the dial rises and locks the verification linkage lever, preventing the verification linkage lever from sliding freely up and down, thus locking it in a locked state.

7. The quick-switch power metering junction box with verification function according to claim 2, characterized in that: When the pressure plate is not pressed down, the micro switch is in a connected state between terminals "1" and "2", and in a disconnected state between terminals "1" and "3"; at this time, the output current of the current transformer flows through the first input terminal I. in1 First outgoing terminal I out1 After flowing through the current coil of the energy meter being tested, the current passes through the second output terminal I. out2 The "2" and "1" terminals of micro switch I, and the second input 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 energy meter under test for measurement, in order to statistically analyze the corresponding energy parameters.

8. The quick-switch power metering junction box with verification function according to claim 2, characterized in that: When the pressure plate is pressed down, the micro switch is in an open state between terminals "1" and "2", and in an on state between terminals "1" and "3"; at this time, the output current of the current transformer flows through the first input terminal I. in1 First outgoing terminal I out1 After flowing through the current coil of the energy meter being tested, the current passes through the second output terminal I. out 2. The current flows through the standard energy meter's current coil, and then through the first test terminal IT1 connected to the second outgoing terminal, the "2" and "3" terminals of the micro switch, and the second incoming 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 energy meter under test and the standard energy meter connected in series with it for simultaneous measurement. The energy parameters of the energy meter under test and the standard energy meter are recorded within the same time period. By calculation and comparison, the measurement accuracy error between the energy meter under test and the standard energy meter can be known, and the calibration function of the energy meter under test can be realized.

9. The quick-switch power metering junction box with verification function according to claim 1, characterized in that: The aforementioned quick-switch power metering junction box enables rapid switching between metering and verification states of the measured power meter through a verification execution mechanism; it effectively prevents accidental contact or operation by setting up a toggle-type locking mechanism; and it reduces the chance of electric shock by using an independent packaging mode for the components.

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