Guide rail meter calibration device

Abstract

The utility model discloses a guide rail meter calibration device, which is characterized by comprising a base assembly plate, a guide rail strip is arranged at the top end of the base assembly plate, a voltage wiring terminal and a current wiring terminal are arranged on the base assembly plate, and a mutual inductor group and a voltage wiring port group are arranged at the lower end of the base assembly plate. The voltage wiring port group is connected with the voltage wiring terminal through a voltage lead, and the mutual inductor group is connected with the current wiring terminal through a current lead. According to the utility model, the precision and consistency of the three-phase guide rail meter body after being verified by the mutual inductor can be improved, and meanwhile, the existing three-phase intelligent electric energy meter verification table body is continuously used, so that the verification efficiency is improved, and the three-phase intelligent electric energy meter verification table is suitable for large-scale verification.

Description

Technical Field

[0001] The utility model relates to the field of intelligent electric energy meters, and in particular to a guide rail meter calibration device. Background Art

[0002] A three-phase electricity meter, also known as a three-phase watt-hour meter or three-phase energy meter, is used to measure the electrical energy output of a power source or load in a three-phase AC circuit. During use, a three-phase meter utilizes the voltage or current conversion function of a transformer to convert high voltage or high current signals in the power system into low voltage or low current signals suitable for measurement, thereby achieving more accurate measurements. Currently, there are two solutions for connecting a three-phase meter to an external transformer: a dedicated calibration fixture designed for three-phase direct-connection rail-mounted meters, shared with the test bench; or a dedicated test bench combined with a Rogowski coil. This method requires a dedicated calibration fixture for three-phase direct-connection rail-mounted meters, but disassembly is difficult and unsuitable for three-phase rail-mounted meters connected via a transformer. Purchasing a dedicated calibration bench with a standard Rogowski coil requires high-precision matching, but the consistency and accuracy of the Rogowski coil cannot be guaranteed accurately, and the cost of purchasing a dedicated calibration bench is high.

[0003] A prior art application publication number CN106199099B discloses a three-phase electricity meter, comprising a lower shell, an upper shell connected to the lower shell, a terminal block, and a relay and a transformer installed in the lower shell; the upper end surface of the terminal block is formed with a terminal socket and a voltage terminal slot; three groups of current terminals and a neutral terminal are respectively plugged into each terminal socket of the terminal block from left to right; each group of current terminals includes a first current terminal and a second current terminal; the first current terminal and the second current terminal of each group of current terminals are respectively connected to the relay; the transformer includes a main body and a plug-in part; the transformer is installed on the inner connection end of each first current terminal, and the transformer installation part is located in the through-hole formed by the U-shaped opening and the plug-in part; the transformer is detachable, so that the first output terminal is directly connected to the relay, without any redundant connection nodes, reducing the resistance value of the first output terminal part, reducing the heat generation, and extending the service life of the electricity meter. This three-phase meter with a mutual inductor is an independently designed special test bench body and is not compatible with existing ordinary three-phase meters. It has limited application occasions and is relatively costly. Utility Model Content

[0004] In order to solve the technical problems of inconvenient tooling design and disassembly of three-phase electricity meters with mutual inductors and the non-universal inspection platform, the purpose of the utility model is to provide a guide rail meter calibration device to improve the accuracy and consistency of the three-phase guide rail meter body after calibration with mutual inductor access, while continuing to use the existing three-phase intelligent electricity meter calibration platform to improve inspection efficiency and be suitable for large-scale inspection.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a guide rail meter calibration device, comprising a base assembly plate, a guide rail bar disposed at the top of the base assembly plate, voltage and current terminals disposed on the base assembly plate, and a transformer group and a voltage terminal group disposed at the bottom of the base assembly plate. The voltage terminal group is connected to the voltage terminal via a voltage conductor, and the transformer group is connected to the current terminal via a current conductor. The base assembly plate is suitable for various three-phase electricity meters, making the device convenient for use in various applications. The guide rail bar facilitates the installation of various three-phase electricity meters with guide rails. When replacing a guide rail meter, it can be directly removed from the guide rail bar without removing the entire tooling, and without affecting the wiring below.

[0006] Preferably, the voltage wiring port is fixed to the lower end of the base assembly plate by a snap, and the voltage wiring port group includes four groups of voltage wiring ports A / B / C / N; the voltage wiring port designed in this way is more convenient to connect and easy to disassemble, and can be applied to different wiring scenarios.

[0007] Preferably, a first U-shaped support column is provided on the base assembly plate near the voltage terminal, a second U-shaped support column is provided near the current terminal, and the voltage terminal group is provided with a terminal with a serial number. The transformer group includes three transformers with current conductors, and the current conductors are red and black transformer twisted wires, which can prevent miswiring and reduce electromagnetic interference.

[0008] Preferably, the current conductor is fixed around the second U-shaped support column on the base assembly plate, and the transformer group is connected through the current conductor and the current terminal. Such wiring can prevent miswiring and reduce electromagnetic interference. At the same time, the support column not only plays a supporting role, but also can hold the wire, preventing the current conductor from pulling the customized transformer and getting entangled with other wires when it falls when the guide table is replaced. The voltage conductor is fixed to the first U-shaped support column through S-shaped routing. The S-shaped routing prevents the voltage conductor from pulling the conductive copper bar when the voltage conductor falls when the guide table is replaced, and the wiring harness is clearer and prevents entanglement with other wires.

[0009] The beneficial effects of the utility model are as follows: the tooling comes with a guide rail bar that is easy to install, which makes the inspection more efficient and easy to install; the high precision of the current transformer is utilized to improve the accuracy of the guide rail meter body after calibration; there is no need to purchase a special calibration table for the guide rail meter, which is low in cost and more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the main structural diagram of the present utility model.

[0011] Figure 2 This is an overall structural diagram of the second embodiment of the present utility model.

[0012] In the figure, 1 is the guide rail, 2 is the screw, 3 is the voltage terminal, 4 is the current terminal, 5 is the transformer group, 6 is the hexagonal screw, 7 is the base assembly plate, 8 is the three-phase transformer-connected guide rail meter, 9 is the three-phase meter base assembly plate, 10 is the terminal with a serial number, 11 is the first U-shaped support column, and 12 is the second U-shaped support column. DETAILED DESCRIPTION

[0013] The present invention will be further described in detail below with reference to the accompanying drawings.

[0014] Example 1: Figure 1 As shown, a guide rail meter calibration device provided by the first embodiment of the present invention includes a base assembly plate 7, a guide rail bar 1 is provided at the top of the base assembly plate 7, a voltage terminal 3 and a current terminal 4 are provided on the base assembly plate 7, and a transformer group 5 and a voltage wiring port group are provided at the lower end of the base assembly plate 7. The voltage wiring port group is connected to the voltage terminal 3 through a voltage wire, and the transformer group 5 is connected to the current terminal 4 through a current wire. The working principle of the transformer is based on the principle of electromagnetic induction. When current passes through the main coil, a magnetic field is generated. This magnetic field passes through the secondary coil, thereby generating a potential difference in the secondary coil to realize the transmission of electrical energy. The transmission ratio of the transformer can be determined by the ratio of the number of turns of the main coil and the secondary coil. The Rogowski coil is too large, and using a customized transformer group 5 to replace the Rogowski coil can cope with more usage occasions.

[0015] The base assembly plate 7 is suitable for various three-phase electricity meters, making the device convenient to use in various applications. The bottom of the base assembly plate 7 is provided with a terminal 10 with a serial number, which is convenient for clear wiring during use. The guide rail 1 facilitates the installation of various three-phase electricity meters with guide rails. When replacing the guide rail meter, it can be directly removed from the guide rail 1 without removing the entire tooling, and it will not affect the wiring part below. The three-phase electricity meter is mainly used to measure electrical quantities such as voltage, current, and electric power, and to monitor and manage electricity consumption by measuring electric energy. It can accurately record the active and reactive electric energy in the three-phase circuit, providing an important basis for power metering, electricity bill settlement, etc. Three-phase electricity meters usually use standardized interfaces and installation methods, which are convenient for users to install and maintain. The base assembly plate 7 and related modified parts of this product are adapted to the standardized interfaces and installation methods of three-phase electricity meters.

[0016] As a further improvement of the present invention, the voltage wiring port group is fixed to the lower end of the base assembly plate 7 by a snap buckle, and the voltage wiring port group includes four groups of voltage wiring ports A / B / C / N; the voltage wiring ports designed in this way are more convenient to connect and easy to disassemble, and can be applied to different wiring scenarios.

[0017] As a further improvement of the present invention, a first U-shaped support column 11 is provided on the base assembly plate 7 near the voltage terminal 3, a second U-shaped support column 12 is provided near the current terminal 4, and a terminal 10 with a serial number is provided on the voltage terminal group. The transformer group 5 includes three transformers with current conductors, and the current conductors are red and black transformer twisted wires, which can prevent miswiring and reduce electromagnetic interference.

[0018] As a further improvement of the present invention, the current conductor is fixed around the second U-shaped support column 12 on the base assembly plate 7, and the transformer group 5 is connected to the current terminal 4 through the current conductor. Such wiring can prevent miswiring and reduce electromagnetic interference. At the same time, the support column not only plays a supporting role, but also can hold the wire, preventing the current conductor from pulling the customized transformer and getting entangled with other wires when it falls when the guide table is replaced. The voltage conductor is fixed to the first U-shaped support column 11 through S-shaped routing. The S-shaped routing prevents the voltage conductor from pulling the conductive copper bar when the voltage conductor falls when the guide table is replaced, and the wiring harness is clearer and prevents entanglement with other wires.

[0019] During use, Example 1 uses a fixing structure to mount the rail bar 1 on the base assembly plate 7. The three custom transformers of the custom transformer set 5 are secured to the base assembly plate 7 using bolts. The voltage wires on the base assembly plate 7 are crimped to the corresponding voltage terminals 3 and connected to the voltage sockets on the corresponding three-phase transformer-connected rail meter. The current wires on the transformers are crimped to the corresponding current terminals 4 and connected to the current sockets on the corresponding three-phase transformer-connected rail meter 8. Current transformers with the same specifications as the Rogowski coils can be directly mounted on the base assembly plate 7, making the tooling compact and easy to install. The operating principle of the transformer is based on electromagnetic induction. When current flows through the primary coil, a magnetic field is generated. This magnetic field passes through the secondary coil, creating a potential difference in the secondary coil, enabling electrical energy transmission. The transformer's transmission ratio can be determined by the turns ratio between the primary and secondary coils. Rogowski coils are too large, so replacing them with the custom transformer set 5 can accommodate more applications.

[0020] When routing the three-phase voltage cables on the base assembly plate 7, the three-phase voltage cables are routed on the left side, as there are four wires, A / B / C / N, and the voltage socket on the three-phase transformer-connected DIN rail meter 8 is fixed on the left. The voltage wires are secured by the S-shaped support columns on the base assembly plate 7. Since phase A is on the far left, the routing principle is to route shorter wires at the bottom, with longer wires as you go up (i.e., phase N is at the top). This S-shaped arrangement prevents the voltage wires from pulling on the conductive copper strips when they fall during DIN rail meter replacement, providing a clearer wiring path and preventing entanglement with other wires.

[0021] The current conductors on the custom transformer assembly 5 consist of three sets of twisted red and black transformer cables (twisted to prevent miswiring and reduce electromagnetic interference). The current sockets on the three-phase transformer-connected DIN rail meter 8 correspond to the right side, so the cables are routed to the right. The twisted red and black transformer cables pass through the U-shaped support posts on the base assembly plate 7 to hold the three sets of red and black cables. The support posts provide both support and cable retention. This prevents the current conductors from falling during DIN rail meter replacement, pulling on the custom transformer assembly 5 and becoming entangled with other wiring harnesses. Since phase A is on the far right, the routing principle is: shorter cables run at the bottom and longer cables run at the top, with the longer cables running higher up (i.e., the red and black cables of phase A are at the top).

[0022] When installing the product provided in Example 1, a commonly used three-phase rail meter is hung on the rail bar 1 of the tooling, and the current terminal and voltage terminal are inserted. When replacing the rail meter, it can be directly removed from the rail bar 1 without removing the entire tooling.

[0023] In the second embodiment, a three-phase meter base assembly plate 9 that complies with the standards of the State Grid is used as the base assembly plate 7, which can be adapted to the original standard three-phase smart energy meter calibration platform that complies with the standards of the State Grid and the common standard three-phase meter that complies with the standards of the State Grid. Figure 2 As shown, a guide rail meter calibration device provided by the second embodiment of the present invention includes a three-phase meter base assembly plate 9, a guide rail bar 1 is provided on the top of the base assembly plate 7, a voltage terminal 3 and a current terminal 4 are provided on the base assembly plate 7, and a mutual inductor group 5 and a voltage terminal group are provided at the lower end of the base assembly plate 7. The voltage terminal group is connected to the voltage terminal 3 through a voltage wire, and the mutual inductor group 5 is connected to the current terminal 4 through a current wire. The working principle of the mutual inductor is based on the principle of electromagnetic induction. When current passes through the main coil, a magnetic field is generated. This magnetic field passes through the secondary coil, thereby generating an electric potential difference in the secondary coil to realize the transmission of electric energy. The transmission ratio of the mutual inductor can be determined by the turns ratio of the main coil and the secondary coil. The Rogowski coil is too large, and using a customized mutual inductor group 5 to replace the Rogowski coil can cope with more usage occasions.

[0024] The three-phase meter base assembly plate 9 is compatible with various three-phase electricity meters, making the device convenient for use in a variety of applications. The bottom of the three-phase meter base assembly plate 9 features numbered terminal blocks 10, facilitating clear wiring during use. The guide rail 1 facilitates the installation of various three-phase electricity meters with guide rails. When replacing a three-phase electricity meter, it can be removed directly from the guide rail 1 without removing the entire fixture or disturbing the wiring underneath. Three-phase electricity meters are primarily used to measure electrical quantities such as voltage, current, and power, and to monitor and manage electricity consumption by measuring electrical energy. They accurately record active and reactive energy in three-phase circuits, providing an important basis for electricity metering and bill settlement. Three-phase electricity meters typically utilize standardized interfaces and mounting methods, making them easy for users to install and maintain. The three-phase meter base assembly plate 9 and related modified components in this product are compatible with the standardized interfaces and mounting methods of three-phase electricity meters.

[0025] As a further improvement of the present invention, the voltage wiring port is fixed to the lower end of the three-phase meter base assembly plate 9 by a snap buckle, and the voltage wiring port group includes four groups of voltage wiring ports A / B / C / N; the voltage wiring port designed in this way is more convenient to connect and easy to disassemble, and can be applied to different wiring scenarios.

[0026] As a further improvement to the present invention, the three-phase meter base assembly plate 9 is equipped with a first U-shaped support column 11 near the voltage terminal 3 and a second U-shaped support column 12 near the current terminal 4. The voltage terminal group is equipped with numbered terminals 10. The transformer group 5 includes three transformers with current conductors. The current conductors are red and black twisted transformer cables, which prevent miswiring and reduce electromagnetic interference.

[0027] As a further improvement to the present invention, the current conductor is fixed around the second U-shaped support column 12 on the three-phase meter base assembly plate 9. This wiring can prevent miswiring and reduce electromagnetic interference. At the same time, the support column not only plays a supporting role, but also can hold the wire, preventing the current conductor from pulling the customized transformer and becoming entangled with other wires when it falls when the guide rail meter is replaced. The voltage conductor is fixed to the first U-shaped support column 11 on the three-phase meter base assembly plate 9 through S-shaped routing. The S-shaped routing prevents the voltage conductor from pulling the conductive copper bar when the voltage conductor falls when the guide rail meter is replaced, and the wiring harness is clearer and prevents entanglement with other wires.

[0028] When using Example 2, the guide rail 1 is installed on the three-phase meter base assembly plate 9 by two M4*16 screws 2; the three customized mutual inductors of the customized mutual inductor group 5 are fixed on the three-phase meter base assembly plate 9 by six M5*10 hexagon socket screws 6. The working principle of the mutual inductor is based on the principle of electromagnetic induction. When current passes through the main coil, a magnetic field is generated. This magnetic field passes through the secondary coil, thereby generating an electric potential difference in the secondary coil and realizing the transmission of electric energy. The transmission ratio of the mutual inductor can be determined by the turns ratio of the main coil and the secondary coil. The Rogowski coil is too large, and using the customized mutual inductor group 5 instead of the Rogowski coil can cope with more usage occasions.

[0029] During assembly, crimp the voltage wire on the three-phase meter base assembly plate 9 to the corresponding voltage terminal 3 and connect it to the voltage socket on the corresponding three-phase mutual inductance access type rail meter, and crimp the current wire on the transformer to the corresponding current terminal 4 and connect it to the current socket on the corresponding three-phase mutual inductance access type rail meter 8.

[0030] When routing the three-phase voltage cables on the three-phase meter base assembly plate 9, the three-phase voltage cables are routed on the left side, as there are four wires, A / B / C / N, and the voltage socket on the three-phase transformer-connected DIN-rail meter 8 is fixed on the left. The voltage wires are secured by the S-shaped support columns on the three-phase meter base assembly plate 9. Since phase A is on the far left, the routing principle is to route the shortest wire at the bottom, with longer wires as you go up (i.e., phase N is at the top). This S-shaped arrangement prevents the voltage wires from pulling on the conductive copper strips when they fall during DIN-rail meter replacement, providing a clearer wiring path and preventing entanglement with other wires.

[0031] The current conductors on the custom transformer assembly 5 consist of three sets of twisted red and black transformer cables (twisted to prevent miswiring and reduce electromagnetic interference). The current sockets on the three-phase transformer-connected DIN rail meter 8 correspond to the right side, so the cables are routed to the right. The twisted red and black transformer cables pass through the U-shaped support posts on the three-phase meter base assembly plate 9 to hold the three sets of red and black cables. The support posts provide both support and cable retention, preventing the current conductors from falling and pulling on the custom transformers and becoming entangled with other wiring when replacing the DIN rail meter. Since phase A is on the far right, the routing principle is: shorter cables run at the bottom and longer cables run at the top, with the longer cables running higher up (i.e., the red and black cables of phase A are at the top).

[0032] When installing the product provided in Example 2, the entire tooling device is installed on a three-phase smart electricity meter calibration platform that meets the standards specified by the State Grid, and then the rail meter is hung on the rail bar 1 of the tooling, and the current terminal and voltage terminal are inserted. When replacing the rail meter, it can be directly removed from the rail bar 1 without removing the entire tooling.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A guide rail meter calibration device, characterized in that: It includes a base assembly plate, a guide rail is provided on the top of the base assembly plate, a voltage terminal and a current terminal are provided on the base assembly plate, a transformer group and a voltage wiring port group are provided at the lower end of the base assembly plate, the voltage wiring port group is connected to the voltage terminal through a voltage wire, and the transformer group is connected to the current terminal through a current wire.

2. The guide rail meter calibration device according to claim 1, characterized in that: The voltage wiring port group is fixed to the lower end of the base assembly plate by means of buckles.

3. The guide rail meter calibration device according to claim 1 or 2, characterized in that: The voltage wiring port group includes four groups of voltage wiring ports A / B / C / N, and the voltage wiring ports are connected to the voltage wiring terminals through voltage wires.

4. The guide rail meter calibration device according to claim 1, characterized in that: A first U-shaped support column is provided on the base assembly plate near the voltage wiring terminal, and a second U-shaped support column is provided near the current wiring terminal.

5. The guide rail meter calibration device according to claim 1 or 2, characterized in that: The voltage wiring port group is provided with binding posts with serial numbers.

6. The guide rail meter calibration device according to claim 1, characterized in that: The mutual inductor group includes three mutual inductors with current conductors, and the current conductors are red and black mutual inductor twisted wires.

7. The guide rail meter calibration device according to claim 1 or 6, characterized in that: The current conductor is fixed around the second U-shaped support column on the base assembly plate.

8. The guide rail meter calibration device according to claim 1, characterized in that: The voltage wire is fixed on the first U-shaped support column through an S-shaped wiring.

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