Separating type meter changing connecting device and meter changing method without power failure and electric quantity loss

Abstract

The invention discloses a separated type meter replacement connecting device and a meter replacement method without power outage and electric quantity loss, belongs to the technical field of power supply metering, and solves the problems of power outage and no metering in the meter replacement process of an electric energy meter. According to the invention, by designing the separated meter changing connecting device, the new meter and the old meter in work are connected in parallel by adopting the separated meter changing connecting device, and the new meter and the old meter are used for metering together at the stage; the old meter in work is detached, the new meter is installed at the position of the old meter, and only the new meter performs metering independently at the stage; the separating type meter replacement connecting device is detached, and meter replacement without power failure and electric quantity loss is completed; the technical scheme of the invention has the advantages of no need of power failure, no loss of electric quantity, 'original-to-original 'and convenience in operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply metering, and relates to a separable meter replacement connection device and a method for replacing a meter without power interruption and without power loss. Background Art

[0002] An electric energy meter is an instrument used to calculate the electric energy consumption. Classified by the installation wiring method of the meter, it includes direct connection type and indirect connection type (connected through a transformer, hereinafter referred to as direct meter and multiplier meter respectively).

[0003] The direct connection type means that the power lead of the measured line and the lead to the load are directly connected to the corresponding wiring terminals of the watt-hour meter. This kind of electric meter directly connected to the primary line is simply called a direct meter. The indirect connection type means that the watt-hour meter is connected to the secondary side with a current or voltage ratio change, and is not directly connected to the transmission line. Among power users, there are low-voltage small-power consumption users with a load of several kilowatts, and there are also high-voltage industrial and commercial large-power consumption users with a load of several ten thousand kilowatts or more. For high-voltage large-power consumption users, in order to isolate high voltage to ensure the safety of personnel and equipment, to accurately measure the electric energy consumption of large-power consumption users, and due to factors such as insulation, materials, and manufacturing, it is necessary to reduce the large voltage and large current to a measurable value in proportion through a transformer, so as to facilitate the watt-hour meter to measure. This kind of electric meter connected through a transformer is called a multiplier meter.

[0004] During the use of the electric energy meter, due to reasons such as the operating environment and time limit, components will age and wear, which will lead to inaccurate metering; or with the development of society and the need for functions, the original meter can no longer meet the requirements. At this time, it is necessary to replace the electric energy meter. When replacing the electric energy meter in the prior art, the first method is to cut off the power of the high-voltage power line where the electric energy meter is located, disassemble the connection between the secondary voltage circuit of the voltage transformer and the secondary metering current circuit of the current transformer of the electric energy meter to be replaced, connect the new electric energy meter to the secondary voltage circuit of the voltage transformer and the secondary metering current circuit of the current transformer, and then restore power. However, this will affect normal power consumption and bring great inconvenience to power users. The second method is to disconnect the secondary voltage circuit and short-circuit the secondary current circuit at the metering combined wiring box for replacement. Although it does not affect the normal power consumption of users, it will cause non-metering. Due to the huge power consumption of high-voltage users, non-metering for a short time will also cause huge power loss.

[0005] Taking a certain city as an example, there are a total of 5.2214 million users, among which 89,200 are high-voltage users. Assuming the meter replacement time is 15 minutes, the average power consumption of every 100 large-power users in the city is calculated, and users with power consumption at the average level are found. Under the condition that they are operating at the average power, the average power loss per household during meter replacement is estimated to be 11,714 kWh. Calculated according to the average price to the household, the corresponding electricity fee is 7,876.49 yuan. The total loss of 100 large-power users is 11,714 kWh, and the total loss of electricity fees is 787,600 yuan, causing great losses.

[0006] Taking the commonly used three-phase four-wire electric energy meter as an example, as Figure 10 shown is a typical three-phase four-wire electric energy meter. Figure 11 For the tail wiring box of the three-phase four-wire electric energy meter, there are a total of 10 wiring terminals in the tail wiring box of the three-phase four-wire electric energy meter, numbered from 1 # to 10 # ; Figure 12 For the wiring diagram of the three-phase four-wire electric energy meter connected through voltage transformers and current transformers, as Figure 11 and Figure 12 shown, terminals 1 # to 10 # of the three-phase four-wire electric energy meter are respectively used to connect the secondary-side three-phase voltages and three-phase currents of the voltage transformers and current transformers.

[0007] It should be noted that whether it is a three-phase four-wire electric energy meter, a three-phase three-wire electric energy meter, a direct meter or a single-phase meter, or all the wiring terminals of the metering combined wiring box are fixed with double-row screws for the purpose of reliable connection, which provides a way for the power measurement device for non-stop meter replacement of the present invention to be realized. Summary of the Invention

[0008] The present invention is used to solve the problems of power outage and non-metering existing in the process of meter replacement of the electric energy meter.

[0009] The present invention solves the above technical problems through the following technical solutions:

[0010] A separable meter-changing connection device includes two connection components (1), which are connected by a wire; the connection component (1) includes: an insulating housing (10), a metal sleeve (11), and a metal screw (12); on one side of the upper part of the metal sleeve (11), there is a connection piece (111), and both ends of the connection wire between the two connection components (1) are connected through the connection piece (111); below the connection piece (111), along the outer wall of the metal sleeve (11), there is a first outer edge protrusion (112), and the first outer edge protrusion (112) is stuck on the inner wall of the hollow cylindrical tube of the insulating housing (10); the metal sleeve (11) is nested inside the insulating housing (10), and the bottom end of the metal sleeve (11) extends out from the insulating housing (10); the metal screw (12) is inserted inside the metal sleeve (11), and the bottom end of the metal screw (12) extends out from the inside of the metal sleeve (11), and the extended length is less than the length of the screw of the wiring terminal of the tail wiring box of the electric energy meter; the separable meter-changing connection device connects the new meter in parallel with the working old meter, and the new meter simultaneously establishes a voltage and current measurement circuit.

[0011] Further, on one side of the insulating housing (10), there is a connection cavity (101), the connection cavity (101) communicates with the hollow cylindrical tube of the insulating housing (10), a through hole (102) is opened at the top of the connection cavity (101), a welding hole (113) is opened at the top end of the connection piece (111), the connection piece (111) is correspondingly and fittingly installed in the connection cavity (101), and both ends of the connection wire between the two connection components (1) pass through the through hole (102) and are welded in the welding hole (113).

[0012] Further, the connection component (1) further includes: a spring assembly (13), a first annular protrusion (103) is provided on the inner wall of the middle part of the hollow cylindrical tube of the insulating housing (10), and a second annular protrusion (104) is provided on the inner wall of the bottom part of the hollow cylindrical tube of the insulating housing (10). The inner wall of the hollow cylindrical tube of the insulating housing (10), the first annular protrusion (103), and the second annular protrusion (104) form a cylindrical cavity with openings at both the upper and lower ends, and the spring assembly (13) is installed in the cylindrical cavity.

[0013] Further, the connection component (1) further includes: an insulating telescopic sheath (14), and the insulating telescopic sheath (14) is used to cover the part where the bottom end of the metal sleeve (11) extends out from the insulating housing (10) and the part where the bottom end of the metal screw (12) extends out from the inside of the metal sleeve (11); a second outer edge protrusion (141) is provided on the upper part of the insulating telescopic sheath (14), and the second outer edge protrusion (141) is stuck between the bottom of the spring assembly (13) and the second annular protrusion (104).

[0014] Furthermore, the length that the bottom end of the metal screw (12) extends out from the inside of the metal sleeve (11) is 4 mm.

[0015] A method for replacing a meter without power outage and without loss of electricity using the described separable meter replacement connection device includes the following steps:

[0016] Step 1: Connect the new meter in parallel with the working old meter: Loosen the upper row of screws at positions 1 # to 10 # of the new meter, remove the lower row of screws at positions 1 # to 10 # of the new meter, and remove a row of screws at the corresponding position of the metering combined wiring box; Connect one connection component (1) of the separable meter replacement connection device to the position of the removed lower row of screws of the new meter, and connect the other connection component (1) of the separable meter replacement connection device to the position of the removed screws of the metering combined wiring box; Thus, the parallel connection of the new meter and the old meter is completed, and the new meter simultaneously establishes a voltage and current measurement circuit. At this stage, the new meter and the old meter jointly measure;

[0017] Step 2: Remove the working old meter: Unscrew the screws at positions 1 # to 10 # of the old meter in sequence, and disconnect the wiring at the output end of the metering combined wiring box from the old meter;

[0018] Step 3: Install the new meter in the position of the old meter: Tighten the upper row of screws at positions 1 # to 10 # of the new meter, and fixedly connect the wiring of the new meter to the output end of the metering combined wiring box. At this time, the separable meter replacement connection device is connected in parallel with the wiring at the output end of the metering combined wiring box to jointly supply power to the new meter. At this stage, only the new meter measures alone;

[0019] Step 4: Remove the separable meter replacement connection device, and reset and tighten the lower row of screws at positions 1 # to 10 # of the removed new meter to complete the meter replacement without power outage and without loss of electricity.

[0020] The advantages of the present invention are as follows:

[0021] 1) No power outage is required - The meter can be replaced without power outage, without the need to rely on a third-party metering device. Both the new meter and the old meter are calibrated and qualified meters, and there is no problem of whether the equipment is legal and compliant;

[0022] 2) No electricity is lost - Accurate electricity measurement is achieved during the meter replacement process, without overcounting or undercounting, and no third-party metering device is involved; During the meter replacement period, the electricity is jointly measured by the old meter and the new meter, and the data of the old meter can be traced within the specified preservation time limit;

[0023] 3) "Original set and original" - The existing operating equipment and environment do not need to be transformed, and the meter can be replaced "in situ". The meter replacement operation is basically the same as the conventional method process, without adding too many operations;

[0024] 4) Easy to operate - The operation is simple and convenient, and the meter replacement steps are basically the same as normal meter replacement; The cost of tools is extremely low, and the original equipment does not need to be changed at all. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the split meter replacement connection device;

[0026] Figure 2 It is a schematic diagram of the structure of the connection component of the split meter replacement connection device;

[0027] Figure 3 It is a schematic diagram of the structure of the insulating telescopic sheath of the connection component of the split meter replacement connection device;

[0028] Figure 4 It is a schematic diagram of the connection of the old three-phase four-wire electric energy meter to the secondary sides of the voltage transformer and current transformer through the metering combined wiring box;

[0029] Figure 5 It is a schematic diagram of the parallel connection of the new meter and the old meter in operation;

[0030] Figure 6 It is a schematic diagram of removing the old meter in operation;

[0031] Figure 7 It is a schematic diagram of the wiring connection between the new meter and the output end of the metering combined wiring box;

[0032] Figure 8 It is a schematic diagram of the completion of the removal of the split meter replacement connection device and the installation of the new meter;

[0033] Figure 9 It is a schematic diagram of screwing the metal screw of the connection component into the lower row of screw holes of the tail wiring box of the electric energy meter;

[0034] Figure 10 It is a physical diagram of a typical three-phase four-wire electric energy meter;

[0035] Figure 11 It is the tail wiring box of the three-phase four-wire electric energy meter;

[0036] Figure 12 It is the wiring diagram of the three-phase four-wire electric energy meter connected through the voltage transformer and current transformer. Detailed Implementation Modes

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments:

[0039] Embodiment 1

[0040] As Figure 1 shown, the separable meter-changing connection device of this embodiment includes two connection components (1), and the two connection components (1) are connected by a wire.

[0041] As Figure 2 shown, the connection component (1) includes: an insulating housing (10), a metal sleeve (11), a metal screw (12), a spring assembly (13), and an insulating telescopic sheath (14);

[0042] The insulating housing (10) is a hollow cylindrical cylinder. One side of the insulating housing (10) is provided with a connection cavity (101). The connection cavity (101) communicates with the hollow cylindrical cylinder of the insulating housing (10). A through hole (102) is opened at the top of the connection cavity (101). The through hole (102) is used to pass the connection wire between the two connection components (1); a first annular protrusion (103) is provided on the inner wall of the middle part of the hollow cylindrical cylinder of the insulating housing (10), and a second annular protrusion (104) is provided on the inner wall of the bottom of the hollow cylindrical cylinder of the insulating housing (10). The inner wall of the hollow cylindrical cylinder of the insulating housing (10), the first annular protrusion (103), and the second annular protrusion (104) form a cylindrical cavity with openings at both the top and the bottom. The spring assembly (13) is installed in the cylindrical cavity;

[0043] The metal sleeve (11) is a hollow cylindrical tube. On one side of the upper part of the metal sleeve (11), there is a connecting piece (111). At the top of the connecting piece (111), there is a welding hole (113). The welding hole (113) is used for welding the connecting wires between two connecting components (1). The two ends of the connecting wire between the two connecting components (1) respectively pass through the through holes (102) and are welded in the welding hole (113). Along the outer wall of the metal sleeve (11) below the connecting piece (111), there is a circle of first outer edge protrusions (112). The first outer edge protrusions (112) are stuck on the inner wall of the hollow cylindrical tube of the insulating housing (10). The metal sleeve (11) is nested inside the insulating housing (10), and the bottom end of the metal sleeve (11) extends out from inside the insulating housing (10). The connecting piece (111) is correspondingly and fittingly installed in the connecting cavity (101). The metal screw (12) is inserted inside the metal sleeve (11), and the bottom end of the metal screw (12) extends out from inside the metal sleeve (11). The extended length is h, and h is preferably 4 mm. The metal screw (12) can freely rotate inside the metal sleeve (11).

[0044] As Figure 3 shown, the insulating telescopic sheath (14) is used to cover the part where the bottom end of the metal sleeve (11) extends out from inside the insulating housing (10) and the part where the bottom end of the metal screw (12) extends out from inside the metal sleeve (11), playing a role of insulation protection. On the upper part of the insulating telescopic sheath (14), there is a second outer edge protrusion (141). The second outer edge protrusion (141) is stuck between the bottom of the spring assembly (13) and the second annular protrusion (104).

[0045] Embodiment 2

[0046] In this embodiment, taking a three-phase four-wire energy meter as an example, a method for replacing the meter without power interruption and without loss of electricity is introduced. The present invention adopts the double parallel connection method, combines with the split meter replacement connection device in Embodiment 1, and utilizes the basic principle of circuit parallel connection to enable the original wiring to realize the replacement of the energy meter without power interruption and without loss of electricity without any modification.

[0047] The method for replacing the meter without power interruption and without loss of electricity is as follows:

[0048] (1) In the initial state, the old meter is connected to the secondary sides of the voltage transformer and the current transformer through the metering combined wiring box. Taking Figure 4 as an example, the 1 # end and the 3 # end of the old meter are connected to the secondary side of the A-phase current transformer through the metering combined wiring box. The 2 # end and the 10 # end (neutral line) of the old meter are connected to the secondary side of the A-phase voltage transformer through the metering combined wiring box. The 4 #Terminal, 6 # The terminal is connected to the secondary side of the B-phase current transformer through a metering combined wiring box. The 5 # terminal, 10 # terminal (neutral line) is connected to the secondary side of the B-phase voltage transformer through a metering combined wiring box; the 7 # terminal, 9 # terminal is connected to the secondary side of the C-phase current transformer through a metering combined wiring box. The 8 # terminal, 10 # terminal (neutral line) is connected to the secondary side of the C-phase voltage transformer through a metering combined wiring box.

[0049] (2) Connect the new meter in parallel with the working old meter (the first parallel connection), as Figure 5 shown. Specifically: Loosen the upper row of screws at positions 1 # to 10 # of the new meter, remove the lower row of screws at positions 1 # to 10 # of the new meter, and remove a row of screws at the corresponding position of the metering combined wiring box; Connect one connection component (1) of the split meter replacement connection device to the position of the removed lower row of screws of the new meter, and connect the other connection component (1) of the split meter replacement connection device to the position of the removed screws of the metering combined wiring box; Thus, the parallel connection of the new meter and the old meter is completed. The new meter simultaneously establishes a voltage and current measurement circuit. At this stage, the new meter and the old meter jointly measure. Record the time when the new meter and the old meter jointly measure as t. During the t time period, since the new meter and the old meter are in parallel, the user's electricity consumption is the sum of the two meters, so there will be no over-measurement or under-measurement.

[0050] (3) Remove the working old meter, as Figure 6 shown. Sequentially unscrew the screws at positions 1 # to 10 # of the old meter, and disconnect the wiring at the output end of the metering combined wiring box from the old meter.

[0051] (4) Install the new meter in the position of the old meter, as Figure 7 shown. Tighten the upper row of screws at positions 1 # to 10 # of the new meter, and fixedly connect the wiring of the new meter to the output end of the metering combined wiring box. At this time, the split meter replacement connection device and the wiring at the output end of the metering combined wiring box are in parallel (the second parallel connection), jointly supplying power to the new meter. At this stage, only the new meter measures alone.

[0052] (5) Finally, as Figure 8 shown, remove the split meter replacement connection device, and reset and tighten the lower row of screws at positions 1 # to 10 # of the removed new meter to complete the meter replacement without power outage and without loss of electricity.

[0053] As Figure 9 shown, it should be noted that when connecting the metal screw (12) of the connecting component (1) of the split meter replacement connection device to the position of the lower row of screws removed from the new meter, the metal screw (12) is screwed into the lower row of screw holes at the position removed from the new meter 1 # to 10 # and leave a space for the original wiring to pass through; after removing the old meter, insert the original wiring into the wiring terminals at the positions of 1 # to 10 # of the new meter, and then tighten the upper row of screws of the new meter. In this way, the split meter replacement connection device constructs another wiring loop through the outside of the wiring terminals at the positions of 1 # to 10 # The parallel wiring of the split meter replacement connection device and the original wiring jointly supply power to the new meter, so that the disassembly and assembly of the parallel wiring and the original wiring of the split meter replacement connection device do not affect each other.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A separable meter-changing connection device, characterized in that, It includes two connection components (1), and the two connection components (1) are connected by a wire; the connection component (1) includes: an insulating housing (10), a metal sleeve (11), and a metal screw (12); on one side of the upper part of the metal sleeve (11), there is a connection piece (111), and the two ends of the connection wire between the two connection components (1) are respectively connected through the connection piece (111); below the connection piece (111), there is a first outer edge protrusion (112) arranged along the outer wall of the metal sleeve (11), and the first outer edge protrusion (112) is stuck on the inner wall of the hollow cylindrical tube of the insulating housing (10); the metal sleeve (11) is nested inside the insulating housing (10), and the bottom end of the metal sleeve (11) extends out from the insulating housing (10); the metal screw (12) is inserted inside the metal sleeve (11), and the bottom end of the metal screw (12) extends out from the inside of the metal sleeve (11), and the extended length is less than the length of the screw of the wiring terminal of the tail wiring box of the electricity meter; the split meter-changing connection device connects the new meter in parallel with the working old meter, and the new meter simultaneously establishes a voltage and current measurement circuit.

2. The separable meter replacement connection device according to claim 1, wherein, On one side of the insulating housing (10), there is a connection cavity (101), the connection cavity (101) communicates with the hollow cylindrical tube of the insulating housing (10), a through hole (102) is opened at the top of the connection cavity (101), a welding hole (113) is opened at the top end of the connection piece (111), the connection piece (111) is correspondingly and fittingly installed in the connection cavity (101), and the two ends of the connection wire between the two connection components (1) respectively pass through the through hole (102) and are welded in the welding hole (113).

3. The separable meter replacement connection device according to claim 1, characterized in that The connection component (1) further includes: a spring component (13), a first circular protrusion (103) is arranged on the inner wall of the middle part of the hollow cylindrical tube of the insulating housing (10), a second circular protrusion (104) is arranged on the inner wall of the bottom of the hollow cylindrical tube of the insulating housing (10), the inner wall of the hollow cylindrical tube of the insulating housing (10), the first circular protrusion (103), and the second circular protrusion (104) form a cylindrical cavity with openings at both the top and bottom, and the spring component (13) is installed in the cylindrical cavity.

4. The separable meter replacement connection device according to claim 3, wherein The connection component (1) further includes: an insulating telescopic sheath (14), and the insulating telescopic sheath (14) is used to cover the part where the bottom end of the metal sleeve (11) extends out from the insulating housing (10) and the part where the bottom end of the metal screw (12) extends out from the inside of the metal sleeve (11); a second outer edge protrusion (141) is arranged on the upper part of the insulating telescopic sheath (14), and the second outer edge protrusion (141) is stuck between the bottom of the spring component (13) and the second circular protrusion (104).

5. The separable meter replacement connection device according to claim 1, wherein, The length that the bottom end of the metal screw (12) extends out from the inside of the metal sleeve (11) is 4 mm.

6. A method for replacing a meter without power interruption and power loss using the split meter replacement connection device according to any one of claims 1-5, characterized in that, It includes the following steps: Step 1: Connect the new meter in parallel with the old meter in operation: Loosen the upper row of screws at positions 1 # to 10 # of the new meter, and remove the new meter 1 # to 10 # of the lower row of screws at the position, and remove a row of screws at the corresponding position of the metering combined wiring box; Connect one connection component (1) of the split meter replacement connection device to the position of the removed lower row of screws of the new meter, and connect the other connection component (1) of the split meter replacement connection device to the position of the removed screws of the metering combined wiring box; Thus, the parallel connection of the new meter and the old meter is completed, and the new meter simultaneously establishes a voltage and current measurement circuit. At this stage, the new meter and the old meter jointly measure; Step 2. Remove the old meter in operation: Unscrew the screws at positions 1 # to 10 # of the old meter in sequence, and disconnect the wiring at the output end of the metering combined wiring box from the old meter; Step 3: Install the new meter in the position of the old meter: Tighten the upper row of screws of the new meter from 1 # to 10 # at the position, fixedly connect the wiring of the new meter to the output terminal of the metering combined wiring box. At this time, the wiring of the split meter replacement connection device is in parallel with the output terminal of the metering combined wiring box to jointly supply power to the new meter. Only the new meter measures alone at this stage; Step 4: Remove the detachable meter connection device, and reinstall the new meter 1 # to 10 # Reset and tighten the lower row of screws at the position to complete the meter replacement without power interruption and power loss.

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