JPH01173705A - Current transformer - Google Patents

Abstract

PURPOSE:To contrive improvement both in productivity and insulating efficiency by a method wherein, using a U-shaped copper plate as the primary winding, said copper plate is inserted into the coil plate inserting groove provided between the spool of a coil bobbin and a core inserting groove. CONSTITUTION:A copper plate terminal guide groove 20, linking a coil inserting groove 18 and the bottom face of the bobbin 19 with a terminal, is provided on a spool 13. Also, on the upper surface of the bobbin 19, a U-shaped coil plate inserting groove, positioned in the midway of the spool 13 and a magnetic core inserting groove 21 and having the same depth as the winding width of the spool 13 is provided in parallel with the spool 13. A copper plate 23, which is formed in U-shape in the same winding width or a little narrower than that of the spool 13, is fitted to the groove 18, the terminal 22 of the coil plate 23 is inserted in such a manner that it penetrates the groove 20, and the primary winding is constituted. A secondary winding 24 is constituted by winding a copper wire on the spool 13. As a result, the use of a superthick copper wire, the winding of which is depended upon a handworking, can be discontinued and as a result, manhours can be reduced. Also, the insulating efficiency can be improved by pinching the coil plate with a coil bobbin.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a current transformer used in various power supply equipment, video equipment, audio equipment, industrial equipment, telephone related equipment, and the like.

BACKGROUND ART FIGS. 7 and 8 are sectional views of the internal structure of conventional current transformers, respectively. As shown in the figure, a bobbin with a terminal 3 in which a primary terminal 1 and a secondary terminal 2 are respectively implanted,
The primary winding 4 made of very thick copper wire is wound one turn, and the secondary winding 5 is wound a number of times with relatively thin copper wire.
Wire the wires to the primary terminal 1 and secondary terminal 2 through the drawers. The primary winding 4 and the secondary winding 6 can be insulated by adding an insulating tape 6 as shown in FIG. A coil is formed by dividing the primary winding 4 and the secondary winding 6 by providing a secondary insulating collar 7, and a core 8 of silicon steel plate or ferrite is attached to this coil to constitute a current transformer. ing.

Problems to be Solved by the Invention As mentioned above, the conventional current transformer uses a very thick copper wire for the primary winding 4, winds it in one turn, and wires it to the primary terminal 1. In order to prevent terminal marks and bobbin cracking, we have increased the bobbin wall thickness, increased the terminal diameter, and improved the implantation strength to withstand extremely thick copper wire processing. It is necessary to design the terminal bobbin 3 with a strong structure, and in order to ensure insulation that complies with the safety standards of each country, the primary-secondary insulating collar 7 is required as shown in the conventional example in Fig. 8. It is necessary to completely separate the primary winding frame part 1° and the secondary winding frame part 11, and in particular, the primary winding frame part 10 has an interval larger than the used wire diameter even if the primary winding 4 is one turn. Therefore, a waste space portion 12 is required. This results in a reduction in the space allocation of the secondary winding frame portion 11, leading to an extremely small diameter of the secondary wire and a decrease in the efficiency of the secondary output. Furthermore, since the primary winding 4 is wound only one turn, the coupling between the primary winding 4 and the secondary winding 6 is very loose, resulting in a current transformer with poor transmission efficiency.

The present invention solves these problems and makes it possible to automate production, improve insulation properties, and improve transformer transmission efficiency.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides copper plate terminals made of steel copper wire or annealed copper wire to both ends of a copper plate formed in a U-shape by soldering or welding. The bobbin with terminal has a copper plate insertion groove located outside the core insertion groove and inside the winding frame parallel to the winding flange frame. are provided, and a coil plate consisting of a copper plate and a copper plate terminal is inserted along these grooves to form the primary winding, and the copper plate terminal protruding from the guide groove is directly formed as the primary terminal. It is.

Effect: By using the U-shaped copper plate with terminals as described above, it is no longer necessary to wind and wire extremely thick copper wire, which was a manual process, and productivity can be greatly improved. In addition, by inserting the copper plate into the copper plate insertion groove provided between the winding frame of the terminal bobbin and the core insertion groove, primary and secondary insulation is reliably maintained, providing a current transformer that complies with the safety standards of each country. It is possible to do so.

Furthermore, by eliminating wasted space, a large amount of secondary winding space can be secured, and the primary winding and
The coupling area of the next winding is large and tightly coupled, improving transmission efficiency and greatly increasing the degree of freedom in design.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
2 and 3 are a sectional view of the internal structure of the completed vertical type current transformer according to the first embodiment of the present invention, a perspective view showing the primary coil plate and the bobbin with terminals before installation, and FIG. It is a completed coil perspective view seen from the bottom. Also,
FIGS. 4, 5, and 6 are a cross-sectional view of the completed internal structure of a down-type current transformer according to a second embodiment of the present invention, a perspective view, and a side view showing a coil plate and a bobbin with a terminal before installation. FIG. 3 is a perspective view of the completed coil as seen from

As a first embodiment, a vertical type current transformer will be described with reference to FIGS. 1 to 3.

An upper end collar 14 and a lower end collar 15 are provided at both ends of the winding frame 13, respectively.
A bobbin 19 with a terminal is provided, and a secondary pin terminal 16 is planted in one of the flanges 15 at the lower end thereof, and a secondary draw-out groove 17 is provided. Further, the winding frame 13 has a hole-shaped copper plate terminal insertion guide groove 2o that connects a coil plate insertion groove 18, which will be described later, and the bottom surface of the terminal bobbin 19. Further, on the upper surface of the terminal bobbin 19, there is a U-shaped coil plate insertion groove 18 located between the winding frame 13 and the magnetic core insertion groove 21, parallel to the winding width of the winding frame 13, and having the same depth. A coil plate 23 is inserted into the coil plate, with copper plate terminals 22 made of steel copper wire or annealed copper wire attached to both ends of a copper plate formed in a U-shape with the same or smaller width as the winding width of the winding frame 13. Groove 1
8, the terminal 22 of the coil plate 23 is firmly inserted all the way through the terminal insertion guide groove 2o to form a primary winding. The secondary winding 24 is made by winding a copper wire around the winding frame 13 in the same way as a conventional transformer coil, and wiring the winding to the secondary terminal 16 via the lead pull-out groove 17. After solder dip treatment, a silicon steel plate, ferrite, etc. Attach the magnetic core 26 to complete the current transformer.

Next, as a second embodiment, a down-type current transformer will be described with reference to FIGS. 4 to e.

Both ends of the winding frame 13 have flanges 14 and 16, and one of the flanges 16 has a secondary draw-out groove 17 as in the first embodiment,
A secondary pin terminal 16 is also implanted horizontally to the collar 15. The other collar 14 has a copper plate terminal bending guide groove 20.
has. Further, the same coil plate 23 is similarly attached to the coil bobbin 19 provided in the collar 16 on the secondary terminal side in the same manner as in the first embodiment, and the copper plate terminal 22 is inserted into the copper plate terminal bending guide groove 20. It is bent horizontally along the flange 14 to form a primary winding. The same process as in the embodiment for tube 1 is then carried out to complete the current transformer.

Effects of the Invention As described above, according to the present invention, the manual processing of extremely thick copper wires can be abolished, the number of man-hours can be significantly reduced, and automation is possible because the work is simplified.

In addition, because the coil plate of the primary winding is sandwiched between the coil bobbin, which is an integral plastic molded product, insulation performance is improved, and it is possible to comply with all standards in the history of each country.

Furthermore, since the primary winding was made of a coil plate made of copper plate, 1
The next and secondary windings are closely coupled, and the winding space determined by the close surface area of the core can be used effectively to secure a large space for the secondary winding, which improves the transmission efficiency of the current transformer and improves electrical efficiency. The degree of freedom in design to meet performance requirements has been greatly increased, and this has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the completed internal structure of a vertical type current transformer according to the first embodiment of the present invention, Fig. 2 is a perspective view of the coil plate and bobbin with terminals, and Fig. 3 is a view from the bottom of the transformer. (Fig. 4 is a semi-completed perspective view of the second embodiment)
) A sectional view of the completed internal structure of the transformer, Figure 6 is a perspective view of the coil plate and bobbin with terminals, Figure 6 is a completed perspective view of the transformer seen from the side, and Figure 7 is a conventional vertical type. Fig. 8 is a sectional view of the completed internal structure of the fold-down type. 13... Winding frame, 14... Tsuba, 16...
・Tsuba, 16...Secondary terminal pin, 17...
・Secondary drawer groove, 18... Coil plate insertion groove, 19
...Bobbin with terminal, 2o...Copper plate terminal insertion guide groove, 21...Core insertion groove, 22...
...Copper plate terminal, 23...Coil plate, 24...
...Secondary winding, 25...Magnetic core. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A current transformer used for the purpose of detecting the ON/OFF state of the primary current or the amount of primary current based on the output voltage level induced in the secondary winding by passing current through the primary winding and generating magnetic flux in the magnetic core. For the next winding, use a U-shaped copper plate with a width that is the same as or smaller than the coil bobbin winding frame, and a U-shaped copper plate located between the coil bobbin winding frame and the magnetic core insertion groove and parallel to the magnetic core insertion groove. A coil plate insertion groove is provided into which a coil plate is inserted, and the terminals attached to both ends of the coil plate protruding from the side opposite to the coil plate insertion opening are used as the terminals of the primary coil, and the secondary winding is attached to the winding frame of the coil bobbin. Wrapped with
A current transformer with a magnetic core built into the coil bobbin.