A plug-in assembly metering module

Abstract

The present invention discloses a plug-in assembly metering module, comprising a base, contact arms, fuses, and a secondary interface station. The contact arms are arranged at the rear of the base and are arranged in two groups of three phases, one above the other. The fuses are arranged at the upper portion of the base, and the secondary interface station is arranged at the front of the base. The front portion of the base is provided with a base base, and the rear portion of the base base is provided with a base body. Two single-phase metering CTs and two single-phase PTs are arranged inside the base body. An insulating skirt is provided around the periphery of the base body, and a grounding terminal is provided at the lower portion of the base base. The contact arms are provided with contact arm sleeves, and a contact arm connecting ring is provided at the front end of the contact arm sleeves. The present invention has a reasonable design, a compact structure, and uses elastic crimping terminals. It can automatically short-circuit the current secondary circuit when changing the meter. When calibrating the meter, it can be completed by simply connecting the calibration jack and the calibration connecting piece. This can greatly speed up the efficiency of hot meter replacement, manufacturing and maintenance, and reduce metering errors caused by maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a plug-and-play assembly metering module. Background Art

[0002] At present, the installation of electricity metering devices for special transformer customers still relies entirely on manual labor. The installation process is tedious and complicated, and most installation sites have poor environments and poor lighting. Under such conditions, there is a certain degree of uncertainty in ensuring the correct installation and wiring of the metering devices.

[0003] Most metering cabinets at home and abroad adopt fixed metering cabinet mode, in which current transformer, voltage transformer and high-voltage fuse are separately fixedly installed in the high-voltage chamber of high-voltage switchgear. Due to the limitation of high-voltage switchgear structure, the metering components are arranged unreasonably, and inspection and maintenance require power outage or live operation to open the junction box to operate the connection piece, which is inefficient and will also cause a lot of electricity to be unmetered.

[0004] The structure of the metering cabinet is diverse, the installation is very arbitrary, and there is no unified standard. At the same time, the instrument room of the high-voltage switchgear is all on the upper part of the cabinet, and the meter is installed in the instrument room. When measuring and reading the meter, it can only be done while standing on a high facility, which has low efficiency and high danger. Summary of the Invention

[0005] In response to the above problems, the main purpose of the present invention is to design a plug-in assembly metering module, which adopts the assembled installation of the electric energy metering module, and the contact arm, fuse, metering CT, metering PT, electric energy meter, and secondary interface station for calibration are all vacuum cast into one piece with epoxy resin, and all the secondary lead loops of the transformer are led to the elastic crimping terminals of the secondary interface station. The electric energy meter can be connected by pressing the elastic crimping terminals, and the current can be automatically connected to the electric energy meter by pressing the elastic crimping terminals. When the electric energy meter is removed, the two sets of elastic crimping terminals per phase can automatically short-circuit the CT secondary current loop, realizing automatic and safe meter replacement, solving the problems of low installation and maintenance efficiency and high error rate of current electric energy metering devices.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A plug-in assembly metering module, characterized in that it includes a base, a contact arm, a fuse, and a secondary interface station. The contact arm is arranged at the rear of the base and is arranged in two groups of three phases, the fuse is arranged at the upper part of the base, the secondary interface station is arranged at the front of the base, the front part of the base is provided with a base base, the rear part of the base base is provided with a base body, two single-phase CTs and two single-phase PTs are provided inside the base body, an insulating skirt is provided on the periphery of the base body, a grounding terminal is provided at the lower part of the base base, a contact arm is provided on the contact arm, a contact arm connecting ring is provided at the front end of the contact arm sleeve, a fuse chamber is provided on the base body, a fuse is provided in the fuse chamber, fastening nuts are provided at both ends of the fuse, an insulating cap is provided on the outside of the fastening nut, an interface station body is provided on the secondary interface station, a voltage plug-in terminal and a current plug-in terminal are provided on the upper part of the interface station body, and a calibration terminal is provided at the front of the interface station body. The meter socket and calibration connector, base, contact arm, fuse, and secondary interface station are all vacuum-casted into a whole with high-pressure epoxy resin. The voltage plug-in terminal and the current plug-in terminal are both elastic crimping terminals, which can be elastically pressed and elastically returned. The current plug-in terminals are divided into three groups according to phase. Each group of terminals disconnects the current when the electric energy meter is inserted and pressed, and conducts short-circuit current when the electric energy meter is unplugged. The upper contact arm of each phase is connected to the primary input terminal of the corresponding phase CT and the input terminal of the corresponding phase fuse. The lower contact arm of each phase is connected to the primary output terminal of the corresponding phase CT, and the output terminal of the corresponding phase fuse is connected to the primary input terminal of the corresponding phase of the PT. The secondary grounding point of the PT and the secondary grounding point of the CT are connected by a wire and led out to the module grounding terminal. The contact arm connecting ring can be externally connected to the plum blossom moving contact, and the contact arm is reliably closed and disconnected by rocking in and out with the static contact jacket of the metering cabinet.

[0008] The invention discloses a pluggable assembly metering module. A fuse is provided with a fuse chamber, which is placed on the upper part of a base. Fastening bolts and insulating caps are provided on both sides of the fuse chamber. A fuse tube is provided in the fuse chamber, and the rear part of the fuse tube is connected to the fastening bolts through a fuse compression spring.

[0009] The secondary interface station is provided with an interface station body, which is arranged on a base, with voltage plug-in terminals and current plug-in terminals arranged on the upper part of the interface station body, and a calibration jack and a calibration connecting piece arranged on the lower front part of the interface station body.

[0010] A transformer base plate is arranged inside the base body, and the first-phase CT, the first-phase PT, the third-phase PT, and the third-phase CT are arranged on the transformer base plate in sequence, and isolation fixing blocks are arranged between each other. The upper part of the transformer base plate is sequentially provided with upper, middle, and lower layers of bottom plate current separators from top to bottom, and the lower part of the transformer base plate is sequentially provided with upper, middle, and lower layers of bottom plate voltage separators from top to bottom. A first perforation is arranged in the middle of the upper part of the transformer base plate, a second perforation is arranged in the middle of the lower part of the transformer base plate, and two vertical layers of separators are arranged between the first perforation and the second perforation.

[0011] The upper contact arm of each phase is connected to the primary input terminal of the corresponding phase CT and the input terminal of the corresponding phase fuse. The lower contact wall of each phase is connected to the primary output terminal of the corresponding phase CT. The output terminal of the corresponding phase fuse is connected to the primary input terminal of the corresponding phase PT. The secondary grounding point of the PT and the secondary grounding point of the CT are connected by a wire and led to the module grounding terminal. The contact arm connecting ring can be connected to the plum blossom moving contact. The contact arm is reliably closed and disconnected by rocking in and out and the static contact jacket of the metering cabinet. Inside the base body, the first phase upper contact arm is connected to one end of the first phase fuse through voltage lead 1, the other end of the first phase fuse is connected to the first phase PT primary input terminal through voltage lead 2, the third phase upper contact arm is connected to one end of the third phase fuse through voltage lead 5, the other end of the third phase fuse is connected to the third phase PT primary input terminal through voltage lead 6, the first phase PT primary output terminal is connected to the third phase PT primary output terminal, and is connected to one end of the second phase fuse through voltage lead 4, and the other end of the second phase fuse is connected to the second phase upper contact arm through voltage lead 3.

[0012] Inside the base body, the first-phase upper contact arm is connected to the first-phase current copper bar, the other end of the first-phase current copper bar is connected to the first-phase lower contact arm, and the first-phase current copper bar serves as the primary winding of the first-phase CT. The third-phase upper contact arm is connected to the third-phase current copper bar, the other end of the third-phase current copper bar is connected to the third-phase lower contact arm, and the third-phase current copper bar serves as the primary winding of the third-phase CT.

[0013] Inside the base body, the first-phase CT leads out the first-phase secondary current lead 1 from the upper side, and the first-phase secondary current lead 1 is embedded in the upper and middle bottom plate current separators. The first-phase CT leads out the first-phase secondary current lead 2 from the upper side, and the first-phase secondary current lead 2 is embedded in the middle and lower bottom plate current separators. The third-phase CT leads out the third-phase secondary current lead 1 from the upper side, and the third-phase secondary current lead 1 is embedded in the upper and middle bottom plate current separators. The third-phase CT leads out the third-phase secondary current lead 2 from the upper side, and the third-phase secondary current lead 2 is embedded in the middle and lower bottom plate current separators. The first-phase secondary current lead 2 and the third-phase secondary current lead 2 are connected at a through-hole.

[0014] Inside the base body, the first-phase PT leads out the first-phase secondary voltage lead 1 from the bottom side, and the first-phase secondary voltage lead 1 is embedded in the upper and middle bottom plate voltage partitions. The first-phase PT leads out the first-phase secondary voltage lead 2 from the bottom side, and the first-phase secondary voltage lead 2 is embedded in the middle and lower bottom plate voltage partitions. The third-phase PT leads out the third-phase secondary voltage lead 1 from the bottom side, and the third-phase secondary voltage lead 1 is embedded in the upper and middle bottom plate voltage partitions. The third-phase PT leads out the third-phase secondary voltage lead 2 from the bottom side, and the third-phase secondary voltage lead 2 is embedded in the middle and lower bottom plate voltage partitions. The first-phase secondary voltage lead 2 and the third-phase secondary voltage lead 2 are connected at perforation 2, and are short-circuited at a perforation with the secondary current voltage short-circuit wire embedded in the vertical partition at a perforation to the point where the first-phase secondary current lead 2 and the third-phase secondary current lead 2 are connected at a perforation.

[0015] The first-phase secondary current lead 1, the first-phase secondary current lead 2, the third-phase secondary current lead 1, and the third-phase secondary current lead 2 are all connected to the secondary interface platform through perforation 1. The first-phase secondary voltage lead 1, the third-phase secondary voltage lead 1, the first-phase secondary current lead 2, and the third-phase secondary current lead 2 short-circuit lead wires are connected to the secondary interface platform through perforation 2. The secondary grounding wire is led out at the connection point between the first-phase secondary voltage lead 2 and the third-phase secondary voltage lead 2 at perforation 2 and connected to the secondary grounding terminal.

[0016] The top row on the lower front of the secondary interface platform body is arranged from left to right in sequence with the first phase calibration voltage jack, the second phase calibration voltage jack, the third phase calibration voltage jack, and the calibration zero-sequence voltage jack. The middle row on the lower front of the secondary interface platform is arranged from left to right in sequence with the first phase calibration current jack 1 and the first phase calibration current jack 2, the second phase calibration current jack 1 and the second phase calibration current jack 2, the third phase calibration current jack 1 and the third phase calibration current jack 2. The lower row on the lower front of the secondary interface platform is arranged from left to right in sequence with connecting pieces 2b and connecting pieces 3b, connecting pieces 5b and connecting pieces 6b, connecting pieces 8b and connecting pieces 9b. Bidirectional overvoltage protection TVS tubes are connected in parallel between the two elastic terminals of connecting piece 3b, between the two elastic terminals of connecting piece 6b, and between the two elastic terminals of connecting piece 9b.

[0017] Three-phase voltage plug-in terminals are arranged in the front row on the upper part of the secondary interface station body, a voltage connection conductive plate is arranged at the bottom of each phase voltage plug-in terminal, a voltage inner terminal column is arranged on the voltage connection conductive plate, a voltage terminal spring is arranged around the voltage inner terminal column, a voltage terminal head plate is arranged on the upper part of the voltage inner terminal column, limit blocks are arranged on both sides of the current terminal head plate, and a voltage terminal is arranged on the upper part of the voltage terminal head plate. When the voltage terminal is pressed or released, the voltage terminal spring can extend and retract within the range limited by the limit block.

[0018] A three-phase current plug-in terminal is arranged in the rear row on the upper part of the secondary interface station body. Each phase current plug-in terminal is provided with two current plug-in terminals on the left and right. A current connection conductive sheet is arranged at the bottom of the right current plug-in terminal. A current inner terminal column is arranged on the current connection conductive sheet. A current terminal spring is arranged on the periphery of the current inner terminal column. A current terminal head plate is arranged on the upper part of the current inner terminal column. A current terminal is arranged on the upper part of the current terminal head plate. A limit block is arranged on the left side of the current terminal head plate. A slide groove is arranged under the limit block. A limit groove is arranged on the limit block. A current conductive column is arranged downward on the left part of the current terminal head plate. The current conductive column penetrates the limit groove. A conductive spring is arranged at the lower part of the current conductive column. The electric spring inserts into the slide slot, and the current terminal spring can extend and retract within the range limited by the limit block when the current terminal is pressed or released. When the current terminal is pressed, the current terminal head plate is pressed, driving the current conductive column to move downward, and the current conductive column drives the current conductive spring to retract to the right, so that the current conductive spring is separated from the current connection conductive sheet on the left current plug-in terminal, disconnecting the current loop. When the current terminal is released, the current terminal head plate is rebounded upward, driving the current conductive column to move upward, and the current conductive column drives the current conductive spring to extend to the left, so that the current conductive spring and the current connection conductive sheet on the left current plug-in terminal are closed and the current loop is connected.

[0019] The first-phase secondary voltage lead 1 is connected to the voltage connection conductive piece at the bottom of the first-phase voltage plug-in terminal, and the voltage connection conductive piece at the bottom of the first-phase voltage plug-in terminal is connected to the first-phase calibration voltage jack through a wire. The third-phase secondary voltage lead 1 is connected to the voltage connection conductive piece at the bottom of the third-phase voltage plug-in terminal, and the voltage connection conductive piece at the bottom of the third-phase voltage plug-in terminal is connected to the third-phase calibration voltage jack through a wire. The short-circuit lead wires of the first-phase secondary voltage lead 2 and the third-phase secondary voltage lead 2 are connected to the voltage connection conductive piece at the bottom of the second-phase voltage plug-in terminal, and the voltage connection conductive piece at the bottom of the second-phase voltage plug-in terminal is connected to the second-phase calibration voltage jack through a wire.

[0020] The first phase secondary current lead 1 is connected to the first loose-fitting terminal of the connecting piece 3b, the first phase secondary current lead 2 is connected to the second loose-fitting terminal of the connecting piece 3b, the third phase secondary current lead 1 is connected to the first loose-fitting terminal of the connecting piece 9b, the third phase secondary current lead 2 is connected to the second loose-fitting terminal of the connecting piece 9b, the first loose-fitting terminal of the connecting piece 2b is connected to the current connection conductive piece at the bottom of the left current plug-in terminal of the first phase through a wire, the second loose-fitting terminal of the connecting piece 3b is connected to the current connection conductive piece at the bottom of the right current plug-in terminal of the first phase through a wire, the first loose-fitting terminal of the connecting piece 2b is connected to the current connection conductive piece at the bottom of the right current plug-in terminal of the first phase through a wire, The button is connected to the second current socket of the first phase calibration meter through a wire, the second tight terminal of the connecting piece 2b is connected to the first current socket of the first phase calibration meter through a wire, the first tight terminal of the connecting piece 8b is connected to the current connection conductive piece at the bottom of the left current plug-in terminal of the third phase through a wire, the second tight terminal of the connecting piece 9b is connected to the current connection conductive piece at the bottom of the right current plug-in terminal of the third phase through a wire, the first tight terminal of the connecting piece 8b is connected to the second current socket of the third phase calibration meter through a wire, and the second tight terminal of the connecting piece 8b is connected to the first current socket of the third phase calibration meter through a wire.

[0021] When the electric energy meter terminals are inserted into the voltage and current plug-in terminals on the secondary interface station, when the connecting piece 2b and the connecting piece 3b are both on the left, the electric energy meter is in the normal metering state. When the first phase calibration voltage jack, the second phase calibration voltage jack, the third phase calibration voltage jack, the first phase calibration current jack one and the first phase calibration current jack two, the third phase calibration current jack one and the third phase calibration current jack two are connected to the calibration device, and the connecting piece 2b is on the right and the connecting piece 3b are both on the left, the module is in the calibration state. When the electric energy meter terminals are unplugged from the voltage and current plug-in terminals on the secondary interface station, the secondary current circuit is automatically short-circuited, thereby achieving the purpose of quick meter replacement.

[0022] A module mounting hole is provided at the front of the base, and a secondary grounding terminal is provided at the lower part of the base body, which can provide reliable grounding for the module and the outside.

[0023] Compared with the prior art, the technical effects of the present invention are:

[0024] The present invention provides a pluggable assembly metering module, that is, epoxy resin is used to cast a contact arm, a fuse, a metering CT, a metering PT, an electric energy meter, and a secondary interface platform for meter calibration into an integrated module, which can achieve the purpose of modular assembly and quick maintenance without wiring. At the same time, when the electric energy meter is connected and the two sets of elastic crimping terminals per phase of the secondary interface platform are pressed, the current is automatically connected to the electric energy meter. When the electric energy meter is removed, the two sets of elastic crimping terminals per phase can automatically short-circuit the CT secondary current circuit, thereby realizing automatic and safe meter replacement and solving the problems of low installation and maintenance efficiency and high error rate of current electric energy metering devices.

[0025] The present invention has reasonable design, compact structure, safe and quick meter replacement and calibration, and has great promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view of the overall structure of the present invention;

[0027] Figure 2 It is a side view of the overall structure of the present invention;

[0028] Figure 3 A top view of the overall structure of the present invention;

[0029] Figure 4 It is a back view of the overall structure of the present invention;

[0030] Figure 5 It is an overall side view of the internal connection diagram of the present invention;

[0031] Figure 6 This is the overall back view of the internal connection diagram of the present invention;

[0032] Figure 7 This is an internal diagram of the current terminal of the secondary interface station of the present invention;

[0033] Figure 8 This is an internal diagram of the voltage terminal of the secondary interface station of the present invention. DETAILED DESCRIPTION

[0034] The present invention is described in detail below with reference to the accompanying drawings:

[0035] like Figure 1-Figure 7As shown, a pluggable assembly metering module includes a base 1, contact arms 2, fuses 4, and secondary interface stations 5. The contact arms 2 are arranged at the rear of the base 1 and are divided into two groups of three phases, the fuses 4 are arranged at the top of the base 1, and the secondary interface stations 5 are arranged at the front of the base 1. The front of the base 1 is provided with a base base 101, and the rear of the base base 101 is provided with a base body 103. Two single-phase CTs 601 and two single-phase PTs are arranged inside the base body 103. 602, an insulating skirt 102 is provided on the periphery of the base body 103, a grounding terminal 104 is provided at the lower part of the base base 101, a contact arm sleeve 201 is provided on the upper group of contact arms of the contact arm 2, a contact arm connecting ring 202 is provided at the front end of the contact arm sleeve 201, a fuse chamber 401 is provided on the base body 103, a fuse tube 407 is provided in the fuse chamber 401, a fastening nut 402 and a fastening nut 404 are provided at both ends of the fuse tube 407, an insulating cap 403 is provided on the outer side of the fastening nut 402, and an insulating cap 405 is provided on the outer side of the fastening nut 404, an interface station body 501 is provided on the secondary interface station 5, a voltage plug-in terminal 502 and a current plug-in terminal 503 are provided on the upper part of the secondary interface station body 501, a first phase calibration meter voltage jack 504, a first phase calibration meter current jack 508, a first phase calibration meter current jack 509, and a connecting piece 2b are provided at the front of the interface station body 501. 514, connecting piece 2b 515, second phase calibration voltage jack 505, second phase calibration current jack 510, second phase calibration current jack 511, connecting piece 5b 516, connecting piece 6b 517, third phase calibration voltage jack 506, third phase calibration current jack 512, third phase calibration current jack 513, connecting piece 8b 518, connecting piece 9b 519, calibration zero sequence voltage jack 507.

[0036] A fuse compression spring 406 is provided at the right end of the fuse tube 407 , and the fuse compression spring 406 is connected to the fastening bolt 402 .

[0037] A transformer base plate 603 is disposed within the base body 103. A first-phase CT 601, a first-phase PT 602, a third-phase PT 6011, and a third-phase CT 6021 are sequentially disposed on the transformer base plate 603. Isolation fixing blocks 606 are provided between each of the three layers. Three layers of current separators 604 are sequentially disposed on the upper portion of the transformer base plate 603 from top to bottom. Three layers of voltage separators 605 are sequentially disposed on the lower portion of the transformer base plate 603 from top to bottom. A first perforation 607 is disposed in the middle of the upper portion of the transformer base plate 603, and a second perforation 608 is disposed in the middle of the lower portion of the transformer base plate. Two vertical separators 609 are disposed between the first and second perforations 607 and 608.

[0038] The first phase upper contact arm 2 is connected to the first phase primary current copper bar, and the other end of the first phase primary current copper bar 801 is connected to the first phase lower contact arm 2. The first phase primary current copper bar serves as the primary part of the first phase CT. The first phase upper contact arm 2 is connected to the primary voltage lead 901. The first phase primary voltage lead 901 The other end is connected to the fastening bolt 402 on the right side of the fuse, and the fastening bolt 404 on the left side of the fuse is connected to the primary voltage lead 2 902. The primary voltage lead 2 902 serves as the primary voltage input of the first phase PT602. The primary voltage output of the first phase PT602 and the third phase PT6021 are short-circuited at the perforation 1 607 and the primary voltage lead 4 904 is led out. The other end of the primary voltage lead 4 904 is connected to the fastening bolt 412 on the right side of the second phase fuse. The fastening bolt 414 on the left side of the second phase fuse is connected to the primary voltage lead 3 903. The other end of the primary voltage lead 3 903 is connected to the second phase upper contact arm 2. The third phase upper contact arm 2 is connected to the primary voltage lead 5 905. The other end of the third phase primary voltage lead 5 905 is connected to the fastening bolt 422 on the right side of the third phase fuse. The fastening bolt 424 on the left side of the fuse is connected to the primary voltage lead 6 906. The primary voltage lead 6 906 serves as the third phase PT The primary voltage input of 6021, the third-phase upper contact arm 2 is connected to the third-phase primary current copper bar 802, and the other end of the third-phase primary current copper bar 802 is connected to the third-phase lower contact arm 2. The third-phase primary current copper bar 802 serves as the primary part of the third-phase CT 6011.

[0039] Inside the base body, the first-phase CT 601 leads out the first-phase secondary current lead 1 701 from the top side, and the first-phase secondary current lead 1 701 is embedded in the upper and middle bottom plate current separators 604. The first-phase CT 601 leads out the first-phase secondary current lead 2 702 from the top side, and the first-phase secondary current lead 2 702 is embedded in the middle and lower bottom plate current separators 604. The third-phase CT 6011 leads out the third-phase secondary current lead 1 703 from the top side, and the third-phase secondary current lead 1 703 is embedded in the upper and middle bottom plate current separators 604. The third-phase CT 6011 leads out the third-phase secondary current lead 2 704 from the top side, and the third-phase secondary current lead 2 704 is embedded in the middle and lower bottom plate current separators 604. The first-phase secondary current lead 2 702 and the third-phase secondary current lead 2 704 are connected at the through-hole 1 607.

[0040] Inside the base body, the first-phase PT 602 leads out the first-phase secondary voltage lead 1 705 from the bottom side, and the first-phase secondary voltage lead 1 705 is embedded in the upper and middle bottom plate voltage partitions 605. The first-phase PT 602 leads out the first-phase secondary voltage lead 2 706 from the bottom side, and the first-phase secondary voltage lead 2 706 is embedded in the middle and lower bottom plate voltage partitions 605. The third-phase PT 6021 leads out the third-phase secondary voltage lead 1 707 from the bottom side, and the third-phase secondary voltage lead 1 707 is embedded in the upper and middle bottom plate voltage partitions 605. The third-phase PT 6011 leads out the third-phase secondary voltage lead 2 708 from the bottom side, and the third-phase secondary voltage lead 2 708 is embedded in the middle and lower bottom plate voltage partitions 605. The first-phase secondary voltage lead 2 706 is connected to the third-phase secondary voltage lead 2 708 at the perforation 2 608, and is short-circuited with the primary voltage lead 904 at the perforation 1 607 through the secondary current voltage short-circuit wire 709 embedded in the vertical partition 609.

[0041] The top row on the lower front of the secondary interface station body 501 is provided with the first phase calibration voltage jack 504, the second phase calibration voltage jack 505, the third phase calibration voltage jack 506, and the calibration zero sequence voltage jack 507 in sequence from left to right. The middle row on the lower front of the secondary interface station 5 is provided with the first phase calibration current jack 1 508 and the first phase calibration current jack 2 509, the second phase calibration current jack 1 510 and the second phase calibration current jack 2 511, the third phase calibration current jack 1 512 and the third phase calibration current jack 513 in sequence from left to right. The lower row on the lower front of the secondary interface station 5 is provided with the connecting piece 2b 514 and the connecting piece 3b 515, the connecting piece 5b 516 and the connecting piece 6b 517, the connecting piece 8b 518 and the connecting piece 9b 519 in sequence from left to right. Between the two elastic terminals of the connecting piece 3b 515, the connecting piece 6b A bidirectional overvoltage protection TVS tube 520 is connected in parallel between the two elastic terminals of 517 and between the two elastic terminals of the connecting piece 9b 519.

[0042] Three-phase voltage plug-in terminals 502 are arranged in the front row on the upper part of the secondary interface station body 501, and a voltage connection conductive sheet 5028 is arranged at the bottom of each phase voltage plug-in terminal 502. A voltage inner terminal column 5023 is arranged on the voltage connection conductive sheet 5028, and a voltage terminal spring 5024 is arranged on the periphery of the voltage inner terminal column 5023. A voltage terminal head plate 5022 is arranged on the upper part of the voltage inner terminal column 5023, and limit blocks 5025 and limit blocks 5026 are arranged on both sides of the current terminal head plate 5022. A voltage terminal 5021 is arranged on the upper part of the voltage terminal head plate 5022. When the voltage terminal 5021 is pressed or released, the voltage terminal spring 5024 can extend and retract within a limited range.

[0043] The three-phase current plug-in terminal 503 is arranged in the rear row of the upper part of the secondary interface station body 501, and each phase current plug-in terminal 503 is provided with two on the left and right. The current connection conductive sheet 5038 is arranged at the bottom of the right current plug-in terminal 503, and the current inner terminal column 5033 is arranged on the current connection conductive sheet 5038. The current terminal spring 5034 is arranged on the periphery of the current inner terminal column 5033. The current terminal head plate 5032 is arranged on the upper part of the current inner terminal column 5033. The current terminal 503 is arranged on the upper part of the current terminal head plate 5032. A limit block 5036 is arranged on the left side of the current terminal head plate 5032. A slide groove 5040 is arranged under the limit block 5036. A limit groove 5037 is arranged on the limit block 5036. A current conductive column 5039 is arranged downward on the left part of the current terminal head plate 5032. The current conductive column 5039 penetrates the limit groove 5037, and a conductive spring 5034 is arranged at the lower part of the current conductive column 5039. 041, the conductive spring clip 5041 passes through the slide groove 5040, and the current terminal 503 is pressed or released. The current terminal spring 5034 can extend and retract within the range limited by the limit block 5035. When the current terminal 503 is pressed, the current terminal head plate 5032 is pressed, driving the current conductive column 5039 to move downward, and the current conductive column 5039 drives the current conductive spring clip 5041 to retract to the right, so that the current conductive spring clip 5041 is separated from the current connection conductive sheet 5041 on the left current plug-in terminal 503 and the current loop is disconnected. When the current terminal 503 is released, the current terminal head plate 5032 is rebounded upward, driving the current conductive column 5039 to move upward, and the current conductive column 5039 drives the current conductive spring clip 5041 to extend to the left, so that the current conductive spring clip 5041 and the current connection conductive sheet 5038 on the left current plug-in terminal 503 are closed and the current loop is connected.

[0044] The first-phase secondary voltage lead 1 705 is connected to the voltage connection conductive piece 5028 at the bottom of the first-phase voltage plug-in terminal 502, and the voltage connection conductive piece 5028 at the bottom of the first-phase voltage plug-in terminal 502 is connected to the first-phase calibration voltage socket 504 through a wire. The third-phase secondary voltage lead 1 707 is connected to the voltage connection conductive piece 5028 at the bottom of the third-phase voltage plug-in terminal 502, and the voltage connection conductive piece 5028 at the bottom of the third-phase voltage plug-in terminal 502 is connected to the third-phase calibration voltage socket 506 through a wire. The short-circuit lead wires of the first-phase secondary voltage lead 2 706 and the third-phase secondary voltage lead 2 708 are connected to the voltage connection conductive piece 5028 at the bottom of the second-phase voltage plug-in terminal 502, and the voltage connection conductive piece 5028 at the bottom of the second-phase voltage plug-in terminal 502 is connected to the second-phase calibration voltage socket 505 through a wire.

[0045] The first phase secondary current lead 1 701 is connected to the first loose-fitting terminal of the connecting piece 3b 515, the first phase secondary current lead 2 702 is connected to the second loose-fitting terminal of the connecting piece 3b 515, the third phase secondary current lead 1 703 is connected to the first loose-fitting terminal of the connecting piece 9b 519, the third phase secondary current lead 2 704 is connected to the second loose-fitting terminal of the connecting piece 9b 519, the first loose-fitting terminal of the connecting piece 2b 514 is connected to the current connection conductive piece 5038 at the bottom of the first phase left current plug-in terminal 503 through a wire, the second loose-fitting terminal of the connecting piece 3b 515 is connected to the current connection conductive piece 5038 at the bottom of the first phase right current plug-in terminal 503 through a wire, the first loose-fitting terminal of the connecting piece 2b 514 is connected to the first phase calibration meter current socket 2 509 through a wire, the second loose-fitting terminal of the connecting piece 2b 514 is connected to the first phase calibration meter current socket 1 508 through a wire, and the connecting piece 8b The first tight / tight terminal 518 is connected to the current connection conductive piece 5038 at the bottom of the third-phase left current plug-in terminal 503 through a wire, the second tight / tight terminal 519 of the connecting piece 9b is connected to the current connection conductive piece 5038 at the bottom of the third-phase right current plug-in terminal 503 through a wire, the first tight / tight terminal 518 of the connecting piece 8b is connected to the third-phase calibration current socket 2 507 through a wire, and the second tight / tight terminal 518 of the connecting piece 8b is connected to the third-phase calibration current socket 1 506 through a wire.

[0046] When the electric energy meter terminals are inserted into the voltage plug-in terminal 502 and the current plug-in terminal 503 on the secondary interface platform, and the connecting piece 2b 514 and the connecting piece 3b 515 are both on the left side, the electric energy meter is in a normal metering state. When the first phase calibration voltage jack 504, the second phase calibration voltage jack 505, the third phase calibration voltage jack 506, the first phase calibration current jack 1 508 and the first phase calibration current jack 2 509, the third phase calibration current jack 1 506 and the third phase calibration current jack 2 507 are connected to the meter calibration device, and the connecting piece 2b 514 is on the right side and the connecting piece 3b 515 are both on the left side, the module is in a meter calibration state. When the electric energy meter terminals are unplugged from the voltage plug-in terminal 502 and the current plug-in terminal 503 on the secondary interface platform, the secondary current circuit is automatically short-circuited, thereby achieving the purpose of quick meter replacement.

[0047] A module mounting hole 105 is provided at the front of the base 101 , and a secondary grounding terminal 104 is provided at the lower portion of the base body 103 . The secondary grounding terminal 104 can provide reliable grounding for the module and the outside.

[0048] The above embodiment only uses a three-phase three-wire metering method to illustrate the module design. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A plug-in assembly metering module, characterized in that: It includes a base, a contact arm, a fuse, and a secondary interface station. The contact arm is arranged at the rear of the base and is arranged in two groups of three phases, the fuse is arranged at the upper part of the base, and the secondary interface station is arranged at the front of the base. The front of the base is provided with a base base, and the rear of the base base is provided with a base body. Two single-phase CTs and two single-phase PTs are provided inside the base body. An insulating skirt is provided on the periphery of the base body. A grounding terminal is provided at the lower part of the base base. A contact arm is provided with a contact arm bushing, and a contact arm connecting ring is provided at the front end of the contact arm bushing. A fuse chamber is provided on the base body, and a fuse is provided in the fuse chamber. Fastening nuts are provided at both ends of the fuse, and an insulating cap is provided on the outside of the fastening nut. An interface station body is provided on the secondary interface station, a voltage plug-in terminal and a current plug-in terminal are provided on the upper part of the interface station body, and a calibration jack and a calibration connecting piece are provided at the front of the interface station body. The base, contact arm, fuse and secondary interface are all vacuum cast into a whole with high-pressure epoxy resin. The voltage plug-in terminal and the current plug-in terminal are elastic crimping terminals, which can be elastically pressed and elastically returned. The current plug-in terminal is divided into three groups according to the phase. Each group of terminals disconnects the current when the electric energy meter is inserted and pressed, and conducts the short-circuit current when the electric energy meter is unplugged. The upper contact arm of each phase is connected to the primary input terminal of the corresponding phase CT and the input terminal of the corresponding phase fuse. The lower contact wall of each phase is connected to the primary output terminal of the corresponding phase CT, and the output terminal of the corresponding phase fuse is connected to the primary input terminal of the corresponding phase of the PT. The secondary grounding point of the PT and the secondary grounding point of the CT are connected by a wire and led to the module grounding terminal. The contact arm connecting ring can be connected to the plum blossom moving contact. The contact arm is reliably closed and disconnected by rocking in and out with the static contact jacket of the metering cabinet. The base base is connected to the rear of the base base through an insulating skirt set on the periphery of the base body. The interior of the base body is placed in the insulating skirt set on the periphery of the base body. Two single-phase CTs and two single-phase PTs set inside the base body share a mutual inductor base plate. A module mounting hole is set at the front of the base base, and a secondary grounding terminal is set at the bottom of the base body. The secondary grounding terminal provides reliable grounding for the module and the outside.

2. The pluggable assembly metering module according to claim 1, characterized in that: The contact arms are divided into three phases and are arranged at the rear of the base, with two upper and lower ones for each phase. A wall-contact sleeve is arranged on the periphery of each contact arm, and a wall-contact connecting ring is arranged at the rear end of the wall-contact sleeve. The wall-contact connecting ring can be used to connect an external plum blossom moving contact. The fuse is provided with a fuse chamber, which is placed on the upper part of the base, with fastening bolts and insulating caps provided on both sides of the fuse chamber, a fuse tube provided in the fuse chamber, and the rear part of the fuse tube connected to the fastening bolts through a fuse compression spring; The secondary interface station is provided with an interface station body, which is arranged on a base base, a voltage plug-in terminal and a current plug-in terminal are arranged on the upper part of the interface station body, and a calibration jack and a calibration connecting piece are arranged on the lower front part of the interface station body.

3. The plug-in assembly metering module according to claim 2, characterized in that: A transformer base plate is provided inside the base body. The first-phase CT, the first-phase PT, the third-phase PT, and the third-phase CT are sequentially provided on the transformer base plate. Isolation fixing blocks are provided between each other. The upper portion of the transformer base plate is provided with three layers of current separators (upper, middle, and lower) in sequence from top to bottom. The lower portion of the transformer base plate is provided with three layers of voltage separators (upper, middle, and lower) in sequence from top to bottom. A first perforation is provided in the middle of the upper portion of the transformer base plate, a second perforation is provided in the middle of the lower portion of the transformer base plate, and two vertical separators are provided between the first and second perforations. Inside the base body, the first-phase upper contact arm is connected to one end of the first-phase fuse via voltage lead 1, the other end of the first-phase fuse is connected to the primary input terminal of the first-phase PT via voltage lead 2, the third-phase upper contact arm is connected to one end of the third-phase fuse via voltage lead 5, the other end of the third-phase fuse is connected to the primary input terminal of the third-phase PT via voltage lead 6, the primary output terminal of the first-phase PT is connected to the primary output terminal of the third-phase PT, and is connected to one end of the second-phase fuse via voltage lead 4, and the other end of the second-phase fuse is connected to the second-phase upper contact arm via voltage lead 3; Inside the base body, the first-phase upper contact arm is connected to the first-phase current copper bar, the other end of the first-phase current copper bar is connected to the first-phase lower contact arm, and the first-phase current copper bar serves as the primary winding of the first-phase CT. The third-phase upper contact arm is connected to the third-phase current copper bar, the other end of the third-phase current copper bar is connected to the third-phase lower contact arm, and the third-phase current copper bar serves as the primary winding of the third-phase CT.

4. A plug-in assembly metering module according to claim 2 or 3, characterized in that: Inside the base body, the first-phase CT leads out the first-phase secondary current lead 1 from the upper side, and the first-phase secondary current lead 1 is embedded in the upper and middle bottom plate current separators. The first-phase CT leads out the first-phase secondary current lead 2 from the upper side, and the first-phase secondary current lead 2 is embedded in the middle and lower bottom plate current separators. The third-phase CT leads out the third-phase secondary current lead 1 from the upper side, and the third-phase secondary current lead 1 is embedded in the upper and middle bottom plate current separators. The third-phase CT leads out the third-phase secondary current lead 2 from the upper side, and the third-phase secondary current lead 2 is embedded in the middle and lower bottom plate current separators. The first-phase secondary current lead 2 and the third-phase secondary current lead 2 are connected at a through hole. Inside the base body, the first-phase PT leads out the first-phase secondary voltage lead 1 from the bottom side, and the first-phase secondary voltage lead 1 is embedded in the upper and middle bottom plate voltage partitions. The first-phase PT leads out the first-phase secondary voltage lead 2 from the bottom side, and the first-phase secondary voltage lead 2 is embedded in the middle and lower bottom plate voltage partitions. The third-phase PT leads out the third-phase secondary voltage lead 1 from the bottom side, and the third-phase secondary voltage lead 1 is embedded in the upper and middle bottom plate voltage partitions. The third-phase PT leads out the third-phase secondary voltage lead 2 from the bottom side, and the third-phase secondary voltage lead 2 is embedded in the middle and lower bottom plate voltage partitions. The first-phase secondary voltage lead 2 and the third-phase secondary voltage lead 2 are connected at perforation 2, and are short-circuited at a perforation with the secondary current voltage short-circuit wire embedded in the vertical partition at a perforation to the point where the first-phase secondary current lead 2 and the third-phase secondary current lead 2 are connected at a perforation.

5. The pluggable assembly metering module according to claim 4, characterized in that: The first-phase secondary current lead 1, the first-phase secondary current lead 2, the third-phase secondary current lead 1, and the third-phase secondary current lead 2 are all connected to the secondary interface platform through perforation 1. The first-phase secondary voltage lead 1, the third-phase secondary voltage lead 1, the first-phase secondary current lead 2, and the third-phase secondary current lead 2 short-circuit lead wires are connected to the secondary interface platform through perforation 2. The secondary grounding wire is led out at the connection point between the first-phase secondary voltage lead 2 and the third-phase secondary voltage lead 2 at perforation 2 and connected to the secondary grounding terminal.

6. The pluggable assembly metering module according to claim 2 or claim 5, characterized in that: The top row at the front of the secondary interface body is equipped with the first phase calibration voltage jack, the second phase calibration voltage jack, the third phase calibration voltage jack, and the calibration zero-sequence voltage jack from left to right. The middle row at the front of the secondary interface body is equipped with the first phase calibration current jack 1 and the first phase calibration current jack 2, the second phase calibration current jack 1 and the second phase calibration current jack 2, the third phase calibration current jack 1 and the third phase calibration current jack 2 from left to right. The lower row at the front of the secondary interface body is equipped with connecting pieces 2b and 3b, connecting pieces 5b and 6b, connecting pieces 8b and 9b from left to right. Bidirectional overvoltage protection TVS tubes are connected in parallel between the two elastic terminals of connecting piece 3b, between the two elastic terminals of connecting piece 6b, and between the two elastic terminals of connecting piece 9b.

7. The pluggable assembly metering module according to claim 2, characterized in that: The front row of the upper part of the secondary interface station body is provided with three-phase voltage plug-in terminals, the bottom of each phase voltage plug-in terminal is provided with a voltage connection conductive sheet, a voltage inner terminal column is provided on the voltage connection conductive sheet, a voltage terminal spring is provided on the periphery of the voltage inner terminal column, a voltage terminal head plate is provided on the upper part of the voltage inner terminal column, limit blocks are provided on both sides of the current terminal head plate, and a voltage terminal is provided on the upper part of the voltage terminal head plate. When the voltage terminal is pressed or released, the voltage terminal spring can extend and retract within the range limited by the limit block; The upper rear row of the secondary interface station body is provided with three-phase current plug-in terminals, and each phase current plug-in terminal is provided with two current plug-in terminals on the left and right. The lower part of the right current plug-in terminal is provided with a current connection conductive sheet, and a current inner terminal column is provided on the current connection conductive sheet. A current terminal spring is provided on the periphery of the current inner terminal column, and a current terminal head plate is provided on the upper part of the current inner terminal column. A current terminal is provided on the upper part of the current terminal head plate. A limit block is provided on the left side of the current terminal head plate, a slide groove is provided under the limit block, and a limit groove is provided on the limit block. A current conductive column is provided downward on the left part of the current terminal head plate, the current conductive column penetrates the limit groove, and a conductive spring is provided at the lower part of the current conductive column. The conductive spring piece passes through the slide groove, and the current terminal spring can extend and retract within the range limited by the limit block when the current terminal is pressed or released. When the current terminal is pressed, the current terminal head plate is pressed, driving the current conductive column to move downward, and the current conductive column drives the current conductive spring piece to retract to the right, so that the current conductive spring piece is separated from the current connection conductive piece on the left current plug-in terminal, disconnecting the current loop. When the current terminal is released, the current terminal head plate is rebounded upward, driving the current conductive column to move upward, and the current conductive column drives the current conductive spring piece to extend to the left, so that the current conductive spring piece and the current connection conductive piece on the left current plug-in terminal are closed and the current loop is connected.

8. The pluggable assembly metering module according to claim 2 or 7, characterized in that: The first-phase secondary voltage lead 1 is connected to the voltage connection conductive piece at the bottom of the first-phase voltage plug-in terminal, and the voltage connection conductive piece at the bottom of the first-phase voltage plug-in terminal is connected to the first-phase calibration voltage jack through a wire. The third-phase secondary voltage lead 1 is connected to the voltage connection conductive piece at the bottom of the third-phase voltage plug-in terminal, and the voltage connection conductive piece at the bottom of the third-phase voltage plug-in terminal is connected to the third-phase calibration voltage jack through a wire. The short-circuit lead wires of the first-phase secondary voltage lead 2 and the third-phase secondary voltage lead 2 are connected to the voltage connection conductive piece at the bottom of the second-phase voltage plug-in terminal, and the voltage connection conductive piece at the bottom of the second-phase voltage plug-in terminal is connected to the second-phase calibration voltage jack through a wire.

9. The pluggable assembly metering module according to claim 2, characterized in that: The first phase secondary current lead 1 is connected to the first loose-fitting terminal of the connecting piece 3b, the first phase secondary current lead 2 is connected to the second loose-fitting terminal of the connecting piece 3b, the third phase secondary current lead 1 is connected to the first loose-fitting terminal of the connecting piece 9b, the third phase secondary current lead 2 is connected to the second loose-fitting terminal of the connecting piece 9b, the first loose-fitting terminal of the connecting piece 2b is connected to the current connection conductive piece at the bottom of the left current plug-in terminal of the first phase through a wire, the second loose-fitting terminal of the connecting piece 3b is connected to the current connection conductive piece at the bottom of the right current plug-in terminal of the first phase through a wire, and the first loose-fitting terminal of the connecting piece 2b is connected to the second current socket of the first phase calibration meter through a wire. The second elastic terminal of connecting piece 2b is connected to the first current socket of the first phase calibration meter via a wire. The first elastic terminal of connecting piece 8b is connected to the current connection conductive piece at the bottom of the third phase left current plug-in terminal via a wire. The second elastic terminal of connecting piece 9b is connected to the current connection conductive piece at the bottom of the third phase right current plug-in terminal via a wire. The first elastic terminal of connecting piece 8b is connected to the second current socket of the third phase calibration meter via a wire. The second elastic terminal of connecting piece 8b is connected to the first current socket of the third phase calibration meter via a wire. When the electric energy meter terminals are inserted into the voltage and current plug-in terminals on the secondary interface station, when the connecting piece 2b and the connecting piece 3b are both on the left, the electric energy meter is in the normal metering state. When the first phase calibration voltage jack, the second phase calibration voltage jack, the third phase calibration voltage jack, the first phase calibration current jack one and the first phase calibration current jack two, the third phase calibration current jack one and the third phase calibration current jack two are connected to the calibration device, and the connecting piece 2b is on the right and the connecting piece 3b are both on the left, the module is in the calibration state. When the electric energy meter terminals are unplugged from the voltage and current plug-in terminals on the secondary interface station, the secondary current loop is automatically short-circuited.

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