Plug-in type electric energy metering junction box and method for replacing electric energy meter and terminal without power cut

Abstract

The invention belongs to the technical field of electric energy metering junction boxes, and particularly relates to a plug-in type electric energy metering junction box and a method for replacing an electric energy meter and a terminal without power cut. The junction box comprises a box body. Two ends of the box body are respectively an electric energy meter plugging area and a terminal plugging area. A plug-in type binding post is arranged in the box body of each plug-in area, the upper cylindrical end of each plug-in type binding post protrudes out of the box body, and the upper cylindrical ends of the plug-in type binding posts of all phases are separated through limiting supporting pieces arranged on the box body; the side part of the base of the plug-in binding post is provided with a short-circuit hole and a fixing hole, and the bottom of the base is provided with a wiring hole. The upper cylindrical end of the plug-in binding post is used for being in plug-in connection with an electric energy meter or a terminal, and a wire is inserted into the wiring hole in the bottom of the plug-in binding post. According to the junction box, a plug-in connection structure is adopted, when the junction box is connected with the electric energy meter and the terminal, the processes of wiring, connecting piece adjusting, screw fastening, checking and the like are not needed, and the installation time of the three-phase four-wire electric energy meter and the terminal is greatly saved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric energy metering junction boxes, and in particular relates to a plug-in electric energy metering junction box and a method for replacing an electric energy meter and a terminal without powering off. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The function of the energy metering junction box is to realize on-site calibration and load meter replacement. The disassembly, assembly and replacement of the three-phase energy meter and terminal connected by the transformer need to be completed through the energy metering junction box. The main workflow of replacing the energy meter is: fix the energy meter and terminal on the meter rack; complete the wiring work between the energy meter, terminal and junction box and check the wiring. The existing energy metering junction box has the following defects in use:

[0004] (1) Low work efficiency.

[0005] The installation of a three-phase four-wire energy meter and terminal requires the following work: fix the energy meter and terminal; cut 20 wires and strip the wires at both ends according to the installation location of the energy meter and terminal on site, and tighten the wires with 80 screws; after installation, check the correctness of each connection and whether the screws are tightened to ensure that the energy metering is correct and reliable. It usually takes more than half an hour to complete the installation and inspection of a set of high-voltage meters and terminals through the existing energy metering junction box.

[0006] (2) There are defects in the structural design, which may easily lead to miswiring problems.

[0007] The existing electric energy metering junction box has the following structural problems: First, the arrangement order of the junction box terminals is different from the arrangement order of the electric energy meter terminals (the arrangement order of the terminals of each phase of the electric energy meter is: current input line-voltage-current output line, and the arrangement order of the junction box terminals is: voltage-current input line-current output line). As a result, the voltage line and the current line need to be intertwined when the electric energy meter and the junction box are connected, which is prone to miswiring problems. Second, the electric energy meter has only two terminals per phase current, while the junction box has three current terminals per phase. The wiring needs to be adjusted by toggling the current connecting piece, which is prone to miswiring problems caused by incorrect connection piece positions.

[0008] (3) Large power loss during meter and terminal replacement.

[0009] The steps required for live replacement of an electricity meter or terminal are as follows: disconnect the voltage connection strip and seal the current connection strip; remove the old meter and terminal and wrap the exposed voltage wires; replace the new meter and terminal and make the connections; restore the connection strip. During the period when the voltage connection strip is disconnected, the user's electricity consumption cannot be measured. It is measured for 15 minutes each time it is disconnected. For a large-capacity dedicated transformer customer, hundreds of thousands of electricity units can be lost at one time. Due to the huge number of high-voltage electricity meters and terminals due for rotation and functional replacement every year, the electricity lost during this period cannot be ignored. Summary of the Invention

[0010] To overcome the deficiencies of the above-mentioned prior art, the present invention provides a plug-in type electricity metering connection box and a method for replacing an electricity meter and a terminal without power interruption. By adjusting the arrangement order of the connection box terminals, removing the voltage and current connection strips and adopting a plug-in design, the installation time of three-phase four-wire electricity meters and terminals is greatly saved, the probability of incorrect wiring problems is reduced, and the electricity lost during replacement is decreased.

[0011] To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:

[0012] The first aspect of the present invention provides a plug-in type electricity metering connection box, including a box body, and both ends of the box body are respectively an electricity meter plug-in area and a terminal plug-in area;

[0013] In the box body of each plug-in area, there are plug-in type connection posts. The upper cylindrical ends of the plug-in type connection posts protrude from the box body, and the upper cylindrical ends of each phase of the plug-in type connection posts are separated by a limit support piece arranged on the box body;

[0014] On the side of the base of the plug-in type connection post, there are short-circuit holes and fixing holes from top to bottom in sequence, and there is a wiring hole at the bottom of the base, and the wiring hole communicates with the fixing hole; the upper cylindrical end of the plug-in type connection post is used for plug-in connection with an electricity meter or a terminal, and the wiring hole at the bottom of the plug-in type connection post is used for inserting a wire.

[0015] The second aspect of the present invention provides a method for replacing an electricity meter and a terminal without power interruption, based on a plug-in type electricity metering connection box provided in the first aspect of the present invention, including: when replacing the electricity meter without power interruption, use a short-circuit screw pre-set in the middle area of the box body to connect the right hole of the short-circuit connection strip on the connection box with the short-circuit hole of the current negative connection post. After short-circuiting and waiting to replace the electricity meter and / or terminal, the electricity meter and / or terminal to be replaced can be replaced without power interruption.

[0016] The above one or more technical solutions have the following beneficial effects:

[0017] (1) The junction box provided by the present invention adopts a plug-and-play connection structure. When connecting to the electricity meter and the terminal, there is no need for wiring, voltage adjustment, current connection strip adjustment, screw tightening, and inspection processes. Without professional training, staff can complete the installation and removal of high-voltage electricity meters and terminals through simple plugging and unplugging, greatly saving the installation and removal time of electricity meters and terminals and significantly reducing labor costs.

[0018] (2) By using the junction box provided by the present invention, the replacement time of high-voltage electricity meters and terminals is greatly shortened. Therefore, the power loss during meter replacement and terminal replacement is significantly reduced, and the personal safety of staff is greatly improved.

[0019] (3) By using the junction box provided by the present invention, the probability of metering errors and the incidence of metering device failures can be greatly reduced. First, the problem of incorrect wiring between the junction box and the electricity meter and the terminal is eliminated. Second, the sliding connection strip structure in the prior art is removed, thus eliminating metering errors caused by incorrect positions of voltage or current connection strips. Third, screw tightening is not required, thus greatly reducing metering device failures such as heating and burning of meter terminals caused by poor contact due to insufficient screw tightening.

[0020] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0022] Figure 1 It is a schematic structural diagram of a plug-in type electricity metering junction box for Embodiment 1.

[0023] Figure 2 It is a top view of a plug-in type electricity metering junction box for Embodiment 1.

[0024] Figure 3 It is a schematic structural diagram of the positive current terminal for Embodiment 1.

[0025] Figure 4 It is a schematic structural diagram of the voltage terminal for Embodiment 1.

[0026] Figure 5 It is a schematic structural diagram of the short connection strip for Embodiment 1.

[0027] Figure 6 It is a schematic structural diagram of the box cover for Embodiment 1. Figure 7 It is a schematic structural diagram of the plug-in type electricity metering junction box with an installation hanging meter column for Embodiment 1. Figure 8 Schematic diagram of the wall-mounted meter column structure of Embodiment 1

[0028] In the figure, 1 is the box body, 101 is the buckle, 102 is the raised sealing hole, 2 is the short connecting piece, 3 is the A-phase current and voltage terminal, 301 is the positive current terminal, 3011 is the shorting hole, 3012 is the fixing hole, 3013 is the wiring hole, 302 is the voltage terminal, 303 is the negative current terminal, 4 is the B-phase current and voltage terminal, 5 is the C-phase current and voltage terminal, 6 is the neutral wire terminal, 7 is the limit support piece, 8 is the area for fixing the meter-changing screws without power interruption, 9 is the box cover, 901 is the buckle, 902 is the groove, 903 is the insulating cylinder, 10 is the wall-mounted meter column, 1001 is the upper protrusion, 1002 is the screw hole, 1003 is the lower protrusion. Detailed implementation manners

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Embodiment 1

[0031] As Figures 1 to 2 shown, the present invention provides a plug-in type electric energy metering junction box, which includes a box body 1, and both ends of the box body 1 are respectively an electric energy meter plug-in area and a terminal plug-in area;

[0032] In the box body 1 of each plug-in area, there is a plug-in type terminal. The upper cylindrical end of the plug-in type terminal protrudes from the box body, and the upper cylindrical ends of each phase of the plug-in type terminals are separated by a limit support piece 7 arranged on the box body 1;

[0033] On the side of the base of the plug-in type terminal, there are successively a shorting hole 3011 and a fixing hole 3012 from top to bottom. There is a wiring hole 3013 at the bottom of the base, and the wiring hole 3013 communicates with the fixing hole 3012; the shorting hole 3011 is used to realize meter changing without power interruption, and there is a fastening screw in the fixing hole 3012. When the voltage / current wire is inserted from the wiring hole 3013 at the bottom of the terminal, the wire is fixed by the fastening screw.

[0034] The whole plug-in type terminal is made of conductive material. After inserting and fixing the voltage / current wire from the bottom of the plug-in type terminal, the upper cylindrical end of the plug-in type terminal is plugged and connected with the electric energy meter or the terminal, and the installation of the electric energy meter or the terminal can be realized.

[0035] The box body 1 is made of insulating material, and there are a plurality of terminal grooves opened on the box body 1. The base of the plug-in type terminal is arranged in the terminal groove, and the terminal grooves are insulated from each other.

[0036] The bottom of the box body 1 is closed and provided with rectangular limit wiring holes. The width of the limit wiring hole corresponding to the voltage terminal is the same as the diameter of the 2.5-square copper wire with insulation, and the width of the limit wiring hole corresponding to the current terminal is the same as the diameter of the 4-square copper wire with insulation. The limit wiring holes and the wiring holes of the plug-in type terminals are arranged in one-to-one correspondence. By providing the limit wiring holes, unpeeled current wires and voltage wires cannot be inserted, preventing the situation of wire skin pressing.

[0037] Rectangular grooves are provided on the side of the box body 1. The rectangular grooves and the plug-in type terminals are arranged in one-to-one correspondence. By providing the rectangular grooves, it is convenient to tighten the screws on the bases of the plug-in type terminals. The above-mentioned limit wiring holes and rectangular grooves are respectively communicated with the terminal grooves.

[0038] The plug-in type terminals include A-phase current and voltage terminals 3, B-phase current and voltage terminals 4, C-phase current and voltage terminals 5, and neutral terminals 6; the arrangement order of each-phase terminals in the watt-hour meter plug-in area and the terminal plug-in area is the same as the arrangement order of the watt-hour meter and terminal terminals respectively.

[0039] The structure of each-phase plug-in type terminals is the same, and each includes a current positive terminal 301, a voltage terminal 302, and a current negative terminal 303; a short-circuit connecting piece 2 is provided between the short-circuit holes 3011 of the current positive terminal 301 and the current negative terminal 303; the left side of the short-circuit connecting piece 2 is fixed on the short-circuit hole of each-phase current positive terminal 301, and the right side is suspended; when performing power-off-free meter replacement, the right side of the short-circuit connecting piece 2 is fixed on the short-circuit hole of each-phase current negative terminal 303 to short-circuit the three-phase current.

[0040] Specifically: The arrangement order of the A-phase current and voltage terminals 3 is: A-phase current positive terminal (A-phase current terminal - in) 301, A-phase voltage terminal 302, A-phase current negative terminal (A-phase current terminal - out) 303;

[0041] The arrangement order of the B-phase current and voltage terminals 4 is: B-phase current positive terminal (B-phase current terminal - in), B-phase voltage terminal, B-phase current negative terminal (B-phase current terminal - out);

[0042] The arrangement order of the C-phase current and voltage terminals 5 is: C-phase current positive terminal (C-phase current terminal - in), C-phase voltage terminal, C-phase current negative terminal (C-phase current terminal - out).

[0043] Such as Figure 3As shown in the figure, taking the positive current terminal 301 as an example, the upper cylindrical end of the positive current terminal 301 is used for pluggable connection with the current terminal of the electricity meter / terminal. On the base of the positive current terminal 301, a short-circuit hole 3011 and a fixing hole 3012 are successively arranged from top to bottom. At the bottom end of the base of the positive current terminal 301, a wiring hole 3013 is provided, and the wiring hole 3013 communicates with the fixing hole 3012. After inserting the stripped wire of the corresponding phase into the base through the wiring hole 3013 of the positive current terminal 301, then tighten the fixing bolt in the fixing hole 3012 to prevent the wire from loosening.

[0044] As Figure 4 shown in the figure, the structures of each phase voltage terminal 302 and the neutral terminal 6 are the same. Two fixing holes are opened on the side of the voltage terminal / neutral terminal, both of which are wire fixing holes; when the wire is inserted into the terminal from the bottom of the terminal, the wire is fixed by screws.

[0045] The voltage connection wires include 4 copper wires with a cross-sectional area of 2.5 square millimeters, which are respectively inserted from below the voltage terminals and the neutral terminal of the junction box and then connected to the three-phase voltage wires and the neutral wire of the electricity meter / terminal. The voltage and neutral wire connections between the electricity meter and the terminal should be connected well at the factory. Usually, the terminal does not need to access the current, so the current wires in the terminal plug-in area are connected according to the on-site requirements.

[0046] As a further technical solution, both the current terminal and the voltage terminal adopt an interference fit design, that is, no fastening screws are required after being inserted into the electricity meter and the terminal. Among them, by opening a slit at the end of the upper cylindrical end of the pluggable terminal, no fastening screws are required to fix it after it is inserted into the electricity meter / terminal.

[0047] As a further technical solution, as Figure 5 shown in the figure, the short-circuit connecting piece 2 is an arcuate metal conductor piece. Screw holes are respectively opened at both ends of the short-circuit connecting piece 2, corresponding to the short-circuit holes of the positive current terminal and the negative current terminal of each phase. The short-circuit connecting piece 2 is fixed on the short-circuit hole of the positive current terminal of each phase through the left hole, and the right hole is left open, that is, insulated from the negative current terminal.

[0048] The middle area on the side of the box body 1 is the live meter replacement screw fixing area 8, that is, the short-circuit screw fixing area; when performing live meter replacement, take out the short-circuit screws in the middle position of the junction box and install them in the right holes of the short-circuit connecting pieces 2 of the A, B, and C phases in sequence. After using the short-circuit screws to connect the right holes of the short-circuit connecting pieces 2 with the short-circuit holes of the negative current terminals, at this time, the three-phase current is short-circuited, and live meter replacement can be carried out.

[0049] As a further technical solution, the limiting support piece 7, on the one hand, serves as an insulating baffle to insulate each phase of the pluggable terminal; on the other hand, the limiting support piece also plays a role in supporting the electricity meter and the terminal.

[0050] After the watt-hour meter and the terminal are plugged in, the top end of the limit support piece 7 contacts the bottom ends of the watt-hour meter and the terminal, indicating that the watt-hour meter and the terminal are plugged in place. After the watt-hour meter and the terminal are plugged in place, their bottoms are exactly located on the limit support piece, and the watt-hour meter and the terminal do not need to be fixed separately with screws.

[0051] There are 5 limit support pieces respectively arranged in the watt-hour meter plugging and unplugging area and the terminal plugging and unplugging area above the box body. The lower part of the limit support piece is grooved inward to ensure the normal installation of the watt-hour meter cover and the terminal cover. Since the screw fixing area on the right side of the current transformer access type watt-hour meter protrudes, a groove is made behind the first limit support piece in the watt-hour meter area to adapt to the protruding area of the watt-hour meter.

[0052] As a further technical solution, as Figure 6 shown, it further includes a box cover 9. The box cover 9 is detachably connected to the box body 1. The box cover 9 covers one side of the box body 1 where a rectangular groove is opened. Both the box cover 9 and the box body 1 are made of insulating materials.

[0053] Snap grooves 101 are respectively arranged at both ends of the box body 1, and snap fasteners 901 are respectively arranged at both ends of the box cover 9. The snap fasteners 901 are matched with the snap grooves 101, so that no fastening screws are needed when the box cover 9 is connected to the box body 1.

[0054] Six protruding insulating cylinders 903 are arranged in the middle of the box body 1, which are respectively arranged in one-to-one correspondence with the right holes of the 6 short connecting pieces 2 on the box body. The insulating cylinders 903 are used to be inserted into the right holes of the short connecting pieces 2 on the box body 1 and the short-circuit holes of the current negative connection terminals 303.

[0055] When there are no short-circuit screws in the right holes of the short connecting pieces 2 on the box body 1 and the short-circuit holes of the current negative connection terminals 303, the box cover 9 can be covered on the box body 1. When there are short-circuit screws, the protruding insulating cylinders 903 are blocked by the screws, and the box cover 9 cannot be installed. By arranging the insulating cylinders 903 on the box cover, it can prevent the problem that the staff forgets to take out the screws in the short connecting pieces 2 after replacing the meter without power-off, resulting in metering errors.

[0056] One raised seal hole 102 is also arranged on one side of the box body 1 where the snap groove 101 is located. A groove 902 matching the raised seal hole 102 is arranged at the corresponding position of the box cover 9. After the box cover 9 is covered on the box body 1, the raised seal hole 102 protrudes from the box cover 9, and the seal can be passed through the raised seal hole 102 to seal the junction box.

[0057] As a further technical solution, as Figure 7 、 Figure 8As shown, a wall clock post 10 is also provided on the box body 1. A lower protrusion 1003 is provided at the bottom end of the wall clock post 10 for installation in the groove of the junction box body 1. An upper protrusion 1001 and a screw hole 1002 are provided on the upper part of the wall clock post 10. After the electricity meter is plugged in, the upper protrusion 1001 above the wall clock post 10 can be embedded in the wall clock groove behind the electricity meter to support the electricity meter, and the electricity meter is further strengthened through the screw hole 1002, solving the problem of the unreliable fixation of the electricity meter.

[0058] Embodiment 2

[0059] The present invention proposes a method for replacing an electricity meter and a terminal without power interruption, based on a plug-in type electricity metering junction box proposed in Embodiment 1 of the present invention, including:

[0060] When replacing the electricity meter without power interruption, use the short-circuit screw preset in the middle area of the box body to connect the right hole of the short-circuit connecting piece on the junction box with the short-circuit hole of the current negative wiring terminal. After short-circuiting the electricity meter and / or terminal to be replaced, the electricity meter and / or terminal to be replaced can be replaced without power interruption.

[0061] When using the junction box to install the electricity meter and / or terminal, insert the upper cylindrical end of the plug-in wiring terminal on the junction box into the electricity meter and / or terminal until the top end of the limit support piece on the junction box contacts the electricity meter and / or terminal to be replaced, indicating that the electricity meter and / or terminal have been plugged in place;

[0062] Insert the wire into the wiring hole at the bottom of the junction box. The wire is electrically connected to the electricity meter and / or terminal through the plug-in wiring terminal on the junction box, and then the wire is fixed using the fastening screw in the fixing hole, and the new installation of the electricity meter and / or terminal can be completed.

[0063] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications or deformations that can be made without creative labor on the basis of the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A plug-in type electric energy metering connection box, characterized in that, It includes a box body, and both ends of the box body are respectively an electricity meter plug-in area and a terminal plug-in area; In the box body of each plug-in area, there is a plug-in type terminal post. The upper cylindrical end of the plug-in type terminal post protrudes from the box body, and the upper cylindrical ends of each phase of the plug-in type terminal post are separated by a limit support piece arranged on the box body; On the side of the base of the plug-in type terminal post, there are a short-circuit hole and a fixing hole in sequence from top to bottom. There is a wiring hole at the bottom of the base, and the wiring hole communicates with the fixing hole; the upper cylindrical end of the plug-in type terminal post is used for plug-in connection with an electricity meter or a terminal, and the wiring hole at the bottom of the plug-in type terminal post is used for inserting a wire.

2. The plug-in type electric energy metering junction box according to claim 1, characterized in that The plug-in type terminal post includes an A-phase current and voltage terminal post, a B-phase current and voltage terminal post, a C-phase current and voltage terminal post, and a neutral wire terminal post; the arrangement order of each phase of the terminal posts in the electricity meter plug-in area and the terminal plug-in area is respectively the same as the arrangement order of the electricity meter and the terminal terminal posts.

3. The plug-in type electric energy metering connection box according to claim 1, characterized in that, Each phase of the plug-in type terminal post respectively includes a current positive terminal post, a voltage terminal post, and a current negative terminal post; there is a short-circuit connecting piece between the short-circuit holes of the current positive terminal post and the current negative terminal post. The left side of the short-circuit connecting piece is fixed on the short-circuit hole of each phase of the current positive terminal post, and the right side is suspended; When performing power-off-free meter replacement, the right side of the short-circuit connecting piece is connected to the short-circuit hole of the current negative terminal post through a short-circuit screw to short-circuit the three-phase current.

4. The plug-in type electric energy metering junction box according to claim 1, characterized in that, The plug-in type terminal post adopts an interference fit design. By opening a slit at the end of the upper cylindrical end of the plug-in type terminal post, it does not need to be fixed with a fastening screw after being inserted into the electricity meter / terminal.

5. The plug-in type electric energy metering connection box according to claim 1, characterized in that, The number of the fixing holes is 2.

6. The plug-in type electric energy metering connection box according to claim 1, wherein The bottom of the box body is closed and is provided with limit wiring holes, and the limit wiring holes are arranged in one-to-one correspondence with the wiring holes of the plug-in type terminal posts. By opening the limit wiring holes, unpeeled wires cannot be inserted; A rectangular groove is opened on the side of the box body, and the rectangular groove is arranged in one-to-one correspondence with the base of the plug-in type terminal post. By opening the limit groove, it is convenient to tighten the screws on the base of the plug-in type terminal post.

7. The plug-in type electric energy metering connection box according to claim 1, characterized in that, It also includes a box cover, and the box cover is detachably connected to the box body.

8. The plug-in type electric energy metering junction box according to claim 7, characterized in that, Both ends of the box body are respectively provided with snap grooves, and both ends of the box body are respectively provided with snaps, and the snaps match the snap grooves; There is an insulating cylinder in the middle of the box cover, and the insulating cylinder is used for inserting into the right-side hole of the short-circuit connecting piece on the box body and the short-circuit hole of the current terminal post.

9. A method for replacing an electric energy meter and a terminal without power interruption, based on the plug-in type electric energy metering connection box according to any one of claims 1-8, characterized in that, It includes: When performing power-off-free meter replacement, the right-side hole of the short-circuit connecting piece on the junction box is connected to the short-circuit hole of the current negative terminal post by using a short-circuit screw preset in the middle area of the box body. After the electricity meter and / or terminal to be replaced is short-circuited, the power-off-free replacement of the electricity meter and / or terminal to be replaced can be carried out.

10. The method according to claim 9, characterized in that When using the junction box to install an electricity meter and / or a terminal, the upper cylindrical end of the plug-in type terminal post on the junction box is inserted into the electricity meter and / or the terminal until the top of the limit support piece on the junction box contacts the electricity meter and / or the terminal to be replaced, indicating that the electricity meter and / or the terminal has been inserted in place; Insert the wire into the wiring hole at the bottom of the junction box. The wire is electrically connected to the electricity meter and / or the terminal through the pluggable terminal on the junction box. Then, fix the wire with the fastening screw in the fixing hole to complete the installation of the electricity meter and / or the terminal.

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