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WO2012139523A1 - 电子式圆形电能表用大电流互感器及其生产方法 - Google Patents

电子式圆形电能表用大电流互感器及其生产方法 Download PDF

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Publication number
WO2012139523A1
WO2012139523A1 PCT/CN2012/074012 CN2012074012W WO2012139523A1 WO 2012139523 A1 WO2012139523 A1 WO 2012139523A1 CN 2012074012 W CN2012074012 W CN 2012074012W WO 2012139523 A1 WO2012139523 A1 WO 2012139523A1
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WIPO (PCT)
Prior art keywords
current
flat
bar
shaped
connecting piece
Prior art date
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PCT/CN2012/074012
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English (en)
French (fr)
Inventor
尹红平
钱金华
杨玉柱
Original Assignee
安徽千恩智能科技股份有限公司
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Priority to US14/111,543 priority Critical patent/US20140125441A1/en
Publication of WO2012139523A1 publication Critical patent/WO2012139523A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H01F27/2852—Construction of conductive connections, of leads
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor

Definitions

  • the invention belongs to the field of electricity, in particular to a large current transformer for an electronic circular electric energy meter and a production method thereof.
  • the high-current transformer is a closed loop device that converts a large current of tens or hundreds of amps into a small current of milliampere level for safe and convenient current sampling. It is mainly used for high current electric energy meters, ammeters, various current measurement and detection devices.
  • a copper connecting piece (similar to a plug) having a width of 18-20 mm protrudes from the bottom of the electric energy meter, and a corresponding slot is matched with the copper connecting piece.
  • the terminal is first installed on the distribution box, and the electric energy meter is connected and connected by the connection piece and the slot of the terminal.
  • One approach is to design an integrated current bar high current transformer that wears a large current transformer with a bore size of less than 18 mm on a 7-11 mm diameter round copper rod. Then, the round copper rod is bent into a U-shape, and then the U-shaped ends are made into a flat connecting piece, and the width becomes 18-20 mm, and the thickness is in accordance with the requirements. This can only be produced one by one, the efficiency is very low, and the cost is very high. After molding, if the flat connecting piece is not plated, it is easily oxidized and affects the use. If electroplating is done, the transformer is already on the current bar. It is necessary to put the transformer together in the plating bath, the current transformer is easily damaged, or the immersion in the high temperature plating bath will directly affect the performance of the product.
  • Another method is a two-section current bar high current transformer.
  • a circular or square copper rod is cut into two sections, respectively bent into an L-shape, and then the L-shaped end is made into a flat connecting piece, the width of the connecting piece becomes 18-20 mm, and the thickness is in accordance with the requirements.
  • the transformer is put on, and then the two L-types are butted from the middle to become a U-shaped strip with flat connecting pieces at both ends.
  • This method solves the influence of electroplating on the quality of the transformer.
  • the problem to be solved by the present invention is that the high current current transformers for electronic circular electric energy meters have high production cost, short use time, and poor product performance.
  • the utility model relates to a large current transformer for an electronic circular electric energy meter, comprising a current sampling coil and a current bar, wherein the current bar is a trough bar, and a current sampling coil is arranged in a middle portion of the trough bar, at both ends of the trough bar A first current blade and a second current blade are respectively embedded in the inner slot.
  • the inlaid first current blade and the second current blade are respectively riveted to the grooved rod by rivets.
  • the first current plug piece is provided with a first voltage sampling line protruding column bumping surface
  • the second current plug piece is provided with a second voltage sampling line protruding column bumping surface;
  • the first voltage sampling line protruding column is bump welded
  • the lower side of the surface is provided with a first voltage sampling lug coupling threaded hole
  • the second voltage sampling line is provided with a second voltage sampling lug coupling threaded hole on the lower side of the bumping welding surface.
  • the grooved bar is a U-shaped bar, which is stamped from a copper plate.
  • the U-shaped bar is stamped with a 1.5mm-2.5mm thick copper plate.
  • the U-shaped bar groove width and the thickness of the first current blade or the second current blade are basically Consistent.
  • the top ends of the first current blade and the second current blade are provided with chamfered slopes.
  • the first current insert and the second current insert have the same structure, and are flat current connecting pieces, which are stamped by a copper plate with a thickness of 2 mm to 2.6 mm and the surface is plated, and the flat current connecting piece has a width of 18-20 mm. Height 55-80mm.
  • the method for producing a large current transformer for an electronic circular electric energy meter comprises the following steps:
  • the 2mm-2.6mm thick copper plate is punched out to form a flat current connecting piece, and the flat current connecting piece is suitable for the size requirement of the circular electric energy meter, and the obtained flat current connecting piece is subjected to electroplating treatment, including tin plating or nickel plating;
  • U-shaped bar (U-shaped conductive beam) is punched out with 1.5mm-2.5mm thick copper plate; whether the U-shaped bar is plated, if necessary, it is pickled and anti-oxidized on the surface without electroplating;
  • the U-shaped rod passes through the inner hole of the already produced current sampling coil, and then the current sampling coil is fixed on the U-shaped rod in an appropriate manner;
  • Two pieces of plated flat current connecting piece are inserted as the first current piece and the second current piece, respectively inserted into the inner groove of the U-shaped rod which is already equipped with the current sampling coil, and the edge of the flat current connecting piece is
  • the U-shaped rod ends are aligned; the flat current connecting piece is riveted to the U-shaped rod by riveting or spot welding.
  • the flat current connecting piece and the U-shaped bar are in double-sided contact, so that the flat current connecting piece and the U-shaped bar have very good overcurrent capability and electrical conductivity, and are not easy to generate heat and have low temperature rise.
  • the product produced by the invention can be well matched with the circular electric energy meter, has the advantages of convenient installation, reliable connection, low temperature rise, high rated current resistance, high precision, and very low copper material, and low cost.
  • the production method of the invention has the requirements of less production process, high production efficiency and suitable for mass production.
  • Figure 1 is a schematic view of the structure of the present invention.
  • FIG. 2 is a schematic view showing the structure of the flat current connecting piece which is riveted in the inner groove of the U-shaped bar by the chattering nail.
  • the present invention comprises a current sampling coil 2 and a current bar
  • the current bar is a grooved bar 1
  • a current sampling coil 2 is disposed in a middle portion of the grooved bar 1 in the inner groove at both ends of the grooved bar 1, respectively
  • a first current blade 8 and a second current blade 10 are embedded.
  • the first current insert 8 is riveted to the trough rod 1 by the rivets 4, 5.
  • the second current insert 10 is riveted to the trough rod 1 by the rivets 14, 15 and the riveting method is machine crimping.
  • a signal line 3 is provided on the current sampling coil 2.
  • the first current blade 8 and the second current blade 10 are respectively provided with a limiting hole 9 and a limiting hole 11 .
  • a first voltage sampling line protruding pillar soldering surface 6 is disposed on the first current blade 8, and a second voltage sampling line protruding pillar bumping surface 13 is disposed on the second current blade 10.
  • the first voltage sampling line is provided with a first voltage sampling lug coupling threaded hole 7 on the lower side of the bumping welding surface 6
  • the second voltage sampling lug is connected to the lower side of the second voltage sampling line protruding column welding surface 13 . Threaded hole 12.
  • the grooved rod 1 is a U-shaped rod which is stamped by a 1.5 mm-2.5 mm thick copper plate, and the groove width of the U-shaped rod is substantially the same as the thickness of the flat current connecting piece.
  • the first current blade 8 and the second current blade 10 have the same structure, and are flat plated current tabs which are stamped from a copper plate and are plated. They are stamped from copper sheets of 2mm to 2.6mm thickness.
  • the flat current connecting piece has a width of 18-20mm, Height 55-80mm.
  • the top ends of the first current blade 8 and the second current blade 10 are provided with chamfered slopes.
  • the 2mm-2.6mm thick copper plate is punched out to form a flat current connecting piece, and the flat current connecting piece is suitable for the size requirement of the circular electric energy meter, and the obtained flat current connecting piece is subjected to electroplating treatment, including tin plating or nickel plating;
  • U-shaped rod 1 (U-shaped conductive beam) is punched out with 1.5mm-2.5mm thick copper plate; whether the U-shaped rod is plated, if necessary, it is pickled and anti-oxidized on the surface without electroplating; U The bar 1 passes through the inner hole of the current sampling coil 2, and then the current sampling coil 2 is fixed to the U-shaped bar in an appropriate manner.
  • Two plated flat current connecting pieces are used as the first current blade 8 and the second current blade 10, respectively inserted into the inner grooves of the U-shaped bars which are already equipped with the current sampling coil 2, and the flat current connection is made.
  • the edge of the sheet is aligned with the edge of the U-shaped rod end; the flat current connecting piece is riveted to the U-shaped rod 1 by riveting or spot welding.
  • the flat current connecting piece and the U-shaped rod 1 are in double-sided contact, so that the flat current connecting piece and the U-shaped rod 1 have very good overcurrent capability and electrical conductivity, and are not easy to generate heat and have low temperature rise.
  • the U-shaped rod 1 Since the U-shaped rod 1 is punched into a U-shape by a flat plate, it can be used while ensuring excessive current capability. In order to reduce its own height by nearly half, it can easily pass through the inner hole of the current sampling coil 2, which reduces the size of the current transformer, and solves the problem that the current transformer is too large to be installed in the table.
  • the inner groove width of the U-shaped bar 1 is substantially the same as the thickness of the flat current connecting piece, one end of the flat current connecting piece is inserted into the inner groove of the U-shaped bar 1, and the mutual fit is very tight.
  • the riveting is better, and the effect of better fixing and electric conduction makes the whole assembled current bar, although it is composed of several split bodies, but can have an excessive current close to the integrated current bar. effect.
  • the two flat current connecting sheets of the present invention are stamped from a copper plate and are bilaterally symmetrical. According to electrical energy
  • the table needs the voltage to work. It provides two ways to take the voltage. One is to reserve a special wire column for voltage. The user can weld the wire to the wire column. The second is reserved. The threaded hole for the voltage can be fixed by the customer by screwing the wire with the connecting piece to the flat current connecting piece.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Description

电子式圆形电能表用大电流互感器及其生产方法 技术领域
本发明属于电学领域，具体地说是一种电子式圆形电能表用大电流互感器及其生产方法。
背景技术
大电流互感器是一个封闭的环形器件，它将几十或者几百安培的大电流变比为毫安级的小电流后，再进行安全便捷地电流采样。它主要用于大电流电能表、电流表，各种电流测量和检测装置。
以美国为代表的很多美洲、亚洲、非洲国家的电能表市场，以前主要是机械式圆形电能表表占据市场主导地位。这种电能表的特点是表壳是圆形，这种电能表与接线端独立，电能表内不带电流互感器。所述的电能表底部伸出有18-20mm宽度的紫铜连接片（类似于插头），对应的接线端上设有与紫铜连接片相匹配的插槽。接线端先装于配电箱上，电能表通过连接片与接线端的插槽以插拔方式连接安装。
随着电子式电表在中国和欧洲的快速发展，特别是智能电表的兴起，上述这些国家也正在快速转向电子式电能表。但是，这种电子式电能其电能表插拔式安装的连接方式没有发生变化，而且其电能表内也通常采用电流互感器作为电流信号取样装置。但在表壳尺寸有限的情况下，电流互感器的尺寸受到限制，所以电流互感器外径应在50mm以内，内孔的尺寸必须小于18mm。
为了寻求一款能同时满足上述要求的大电流互感器，现最典型的两种做法是：
一种做法是设计出一种一体式电流棒大电流互感器，这种互感器将一只内孔尺寸小于18mm的大电流互感器，穿在一根7-11mm直径的圆形紫铜棒上，然后将圆形紫铜棒折弯成U型，再将U型两端拍成扁型连接片，宽度变成18-20mm，厚度按照规定要求。这样只能一只一只生产，效率非常低，成本也非常高。成型以后，如果扁型连接片不做电镀，容易氧化，影响使用。如果做电镀，互感器已经在电流棒上了，要把互感器一起放进电镀池，电流互感器容易损坏，或者高温电镀池里浸泡会直接影响其产品性能。
另一种做法是两截式电流棒大电流互感器，为了解决第一种方式不好电镀的问题，有人在此基础上做了改进。把一根圆形或者方形铜棒截为两截，分别折弯成L型，再将L型一端拍成扁型连接片，连接片宽度变成18-20mm，厚度按照规定要求。然后电镀，电镀完后再穿上互感器，再将两个L型从中间进行对接，变成一个两端带扁形连接片的U型。这种方式解决了电镀对互感器质量的影响，但是，将截断以后的电流棒在电镀以后，再可靠对接到一起，是非常困难的，如果焊接，整个电镀层会受到破坏，两个对接面也不可能完整地焊到一起。所以，有时候会在外面加上绝缘胶带缠绕绑定。效率依然很低。成本依然很高，还有电流棒截断以后对接不好，将产生过电流能力的大幅度下降，在大电流工作的温升非常高，引起表内发热，还是不能很好时间长地使用。
因此，目前需要一种成本低、可靠性高，能长期稳定工作和精确计量的电流互感器，以与电子式圆形电能表匹配。
 技术问题
本发明的要解决的是现有用于电子式圆形电能表的大电流互感器生产成本高、使用时间短和产品性能差的问题。
技术解决方案
本发明述的电子式圆形电能表用大电流互感器，包括电流采样线圈和电流棒，电流棒为槽型棒，在该槽型棒的中段套装有电流采样线圈，在槽形棒两端的内槽中分别镶嵌有第一电流插片和第二电流插片。
镶嵌后的第一电流插片和第二电流插片分别通过铆钉与槽形棒铆接在一起。第一电流插接片上设有第一电压取样线凸出柱碰焊面，第二电流插接片上设有第二电压取样线凸出柱碰焊面；第一电压取样线凸出柱碰焊面下侧设有第一电压取样接线片联接螺纹孔，第二电压取样线凸出柱碰焊面下侧设有第二电压取样接线片联接螺纹孔。
槽型棒为U型棒，它由铜板材冲压而成，U型棒采用1.5mm-2.5mm厚度紫铜板冲压，U型棒槽宽与第一电流插片或第二电流插片的厚度基本一致。
第一电流插片和第二电流插片的顶端设有倒角斜面。第一电流插片和第二电流插片结构相同，为扁形电流连接片，采用2mm-2.6mm厚度的紫铜板材冲压且表面经电镀处理，该扁形电流连接片的片宽18－20mm, 高度55－80mm。
本发明所述的电子式圆形电能表用大电流互感器的生产方法，包括如下步骤：
1 ）把2mm-2.6mm厚的紫铜板材冲制出扁形电流连接片，该扁形电流连接片适合圆形电能表的尺寸要求，得到的扁形电流连接片进行电镀处理，包括镀锡或者镀镍；
2 ）用1.5mm-2.5mm厚度紫铜板材冲制出U型棒（U型导电横梁）；U型棒是否电镀，视需要确定，不电镀则对其表面做酸洗和防氧化处理；
U 型棒穿过已经生产好的电流采样线圈的内孔，然后将电流采样线圈适当的方式固定在U型棒上；
将两片电镀好的扁形电流连接片，作为第一电流插片和第二电流插片，分别插入到已经装有电流采样线圈U型棒两端的内槽内，并使扁形电流连接片边沿与U型棒端部边沿对齐；再通过铆接或者点焊的方式把扁形电流连接片与U型棒铆接牢。扁形电流连接片与U型棒双面接触，使扁形电流连接片与U型棒之间具有非常好的过流能力和导电性能，而且不容易发热，温升低。
 有益效果
本发明生产的产品能很好与圆形电能表配套，具有安装方便，连接可靠，温升低，可耐额定的大电流，精度高，此外非常节约紫铜材料，成本低。
本发明的生产办法，具有生产工序少，生产效率高，适合大批量生产的要求。
 附图说明
图1为本发明的结构示意图。
图2为扁形电流连接片通过聊钉铆牢于Ｕ型棒内槽内的结构示意图。
 本发明的最佳实施方式
如图所示，本发明包括电流采样线圈2和电流棒，电流棒为槽型棒1，在该槽型棒1的中段套装有电流采样线圈2，在槽形棒1两端的内槽中分别镶嵌有第一电流插片8和第二电流插片10。镶嵌后第一电流插片8通过铆钉4、5与槽形棒1铆接牢，镶嵌后第二电流插片10通过铆钉14、15与槽形棒1铆接牢，铆接方式为机压铆接。电流采样线圈2上设有信号线3。第一电流插片8和第二电流插片10上分别设有限位孔9和限位孔11。
在第一电流插片8上设有第一电压取样线凸出柱碰焊面6，在第二电流插片10上设有第二电压取样线凸出柱碰焊面13。第一电压取样线凸出柱碰焊面6下侧设有第一电压取样接线片联接螺纹孔7，第二电压取样线凸出柱碰焊面13下侧设有第二电压取样接线片联接螺纹孔12。
槽型棒1为U型棒，该U型棒采用1.5mm-2.5mm厚度紫铜板冲压制成的，U型棒的槽宽与扁形电流连接片的厚度基本一致。
第一电流插片8和第二电流插片10的结构相同，是由紫铜板材冲压制成的且经电镀的扁形电流连接片。它们采用2mm-2.6mm厚度的紫铜板材冲压。扁形电流连接片的片宽18－20mm, 高度55－80mm。第一电流插片8和第二电流插片10的顶端设有倒角斜面。
所述的电子式圆形电能表用大电流互感器的生产方法：
1 ）把2mm-2.6mm厚的紫铜板材冲制出扁形电流连接片，该扁形电流连接片适合圆形电能表的尺寸要求，得到的扁形电流连接片进行电镀处理，包括镀锡或者镀镍；
2 ）用1.5mm-2.5mm厚度紫铜板材冲制出U型棒１（U型导电横梁）；U型棒是否电镀，视需要确定，不电镀则对其表面做酸洗和防氧化处理； U 型棒１穿过电流采样线圈2的内孔，然后将电流采样线圈2以适当的方式固定在U型棒上。
将两片电镀好的扁形电流连接片作为第一电流插片8和第二电流插片10，分别插入到已经装有电流采样线圈2的U型棒两端的内槽内，并使扁形电流连接片边沿与U型棒端部边沿对齐；再通过铆接或者点焊的方式把扁形电流连接片与U型棒１铆接牢。扁形电流连接片与U型棒１双面接触，使扁形电流连接片与U型棒１之间具有非常好的过流能力和导电性能，而且不容易发热，温升低。
本发明采用U型棒１（U型导电横梁）的优点是：
由于U型棒１通过平板冲制成U型之后，在保证过大电流能力的同时，可 以将其自身高度降低将近一半，从而可以轻松穿过电流采样线圈2内孔，这就使电流互感器尺寸缩小，解决了电流互感器尺寸太大在表内无法安装的问题。
由于U型棒１的内槽槽宽与扁形电流连接片的厚度基本一致，所以，扁形电流连接片一端插入U型棒１的内槽后，相互之间配合十分紧密。另外通过铆接或者点焊的方式铆接牢后，具更好固定和导电的效果，使整个组装式电流棒虽然是几个分体组成，但是能起到与一体式电流棒相近的过大电流的效果。
本发明的两个扁形电流连接片用紫铜板材冲压制成，左右对称。根据电能 表取到电压才能工作的需要，它提供了两种取电压的方式，一是预留了一个取电压专用的焊线柱，用户可以自己焊导线到焊线柱上，二是预留了一个取电压用的螺纹孔，客户也可以通过螺丝方式固定，将带连接片的导线连接到扁形电流连接片上。
 本发明的实施方式
工业实用性
序列表自由内容

Claims (6)

  1. 一种电子式圆形电能表用大电流互感器，包括电流采样线圈和电流棒，其特征在于电流棒为槽型棒，在该槽型棒的中段套装有电流采样线圈，在槽形棒两端的内槽中分别镶嵌有第一电流插片和第二电流插片；镶嵌后的第一电流插片和第二电流插片分别通过铆钉与槽形棒铆接在一起。
  2. 根据权利要求1所述的一种大电流互感器，其特征在于第一电流插接片上设有第一电压取样线凸出柱碰焊面，第二电流插接片上设有第二电压取样线凸出柱碰焊面；第一电压取样线凸出柱碰焊面下侧设有第一电压取样接线片联接螺纹孔，第二电压取样线凸出柱碰焊面下侧设有第二电压取样接线片联接螺纹孔。
  3. 根据权利要求1所述的一种大电流互感器，其特征在于槽型棒为由铜板材冲压而成的U型棒，紫铜板厚度为1.5mm-2.5mm；U型棒槽宽与第一电流插片或第二电流插片的厚度基本一致。
  4. 根据权利要求1所述的一种大电流互感器，其特征在于第一电流插片和第二电流插片的顶端均设有倒角斜面。
  5. 根据权利要求1所述的一种大电流互感器，其特征在于第一电流插片和第二电流插片结构相同，均为由紫铜板材冲压成的经电镀的扁形电流连接片，紫铜板厚度为2mm-2.6mm，该扁形电流连接片的片宽18－20mm, 高度55－80mm。
  6. 根据权利要求１明所述的电子式圆形电能表用大电流互感器的生产方法，包括如下步骤：
    1 ）把2mm-2.6mm厚的紫铜板材冲制出扁形电流连接片，该扁形电流连接片适合圆形电能表的尺寸要求，得到的扁形电流连接片进行电镀处理；
    2 ）用1.5mm-2.5mm厚度紫铜板材冲制出U型棒；U型棒是否电镀，视需要确定，不电镀则对其表面做酸洗和防氧化处理；
    U 型棒穿过电流采样线圈的内孔，然后将电流采样线圈适当的方式固定在U型棒上；
    将两片电镀好的扁形电流连接片，作为第一电流插片和第二电流插片，分别插入到已经装有电流采样线圈U型棒两端的内槽内；再通过铆接或者点焊的方式把扁形电流连接片与U型棒铆接牢。
PCT/CN2012/074012 2011-04-15 2012-04-13 电子式圆形电能表用大电流互感器及其生产方法 WO2012139523A1 (zh)

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