JPS6120731Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a coil storage part that integrates a cylindrical outer wall, a cylindrical inner wall and a bottom surface concentrically inside the outer wall, and one pair of through holes perpendicular to the bottom surface. A zero-phase change case in which the coil is housed in the housing part of a case that has a rectangular part that is integrated with the outside of the cylindrical outer wall and has a connected U-shaped through hole therein, and the lead wire of the coil is pulled out through the U-shaped through hole in the rectangular part. It is a flowing vessel.

Zero-phase current transformers for leakage circuit breakers used to prevent electric shocks when measuring power lines, etc., are usually wound around a ring-shaped core, and terminals are provided for the lead wires at the beginning and end of the winding for external wiring. ing. Conventionally, in this type of current transformer, as shown in Fig. 1 or 2, it is connected to a pin terminal molded with resin or the like integrally with the case, or the coil connected to the pin terminal is integrated with the iron core using resin or the like. The pin terminal is placed outside the mold in a direction horizontal or vertical to the direction of the coil. Alternatively, a method is used in which a coil wound around an iron core is placed in an exterior case, the lead wire of the coil is connected to an insulated lead wire inside the case, and the case is filled with resin. However, with this method, only the connecting part of the lead wire and its vicinity are often embedded and fixed with resin, which is weak against tensile force, and it is difficult to use a machine to use the lead wire under tension. It also has disadvantages, such as the fact that the direction of the pin terminal is fixed and cannot be freely moved, so the mounting direction is limited.

The present invention eliminates these drawbacks and has developed a zero-phase change system in which the lead wire is drawn out as a coil lead wire by passing the insulated lead wire through a U-shaped through hole in a rectangular protrusion provided on the outside of a circular case. Concerning water vessels.

In the zero-phase current transformer of the present invention, as shown in FIG. 3, a cylindrical inner wall 2 and a cylindrical outer wall 3 made of resin or the like are arranged concentrically to form a coil storage section 1 provided on the bottom surface. Further, a part of the side surface of the outer wall 3 of the coil storage part 1 extends outward to form a rectangular part 4 integrally, and a V-shaped groove 5 is formed on the upper surface of the rectangular part 44, and a groove 5 is formed between the coil storage part 1 and the groove 5. A narrow groove 7 is also provided in the center of the partition wall 6. Further, two grooves 12 are provided on the upper surface of the rectangular portion 4 outside the V-shaped groove 5, and these grooves 1
2 is a through hole 8 bent at an almost right angle within the rectangular portion 4;
9, 10, and 11 are provided as shown in FIG. 4, which is a cross section taken along line A-A in FIG. On the other hand, on the bottom surface of the rectangular portion 4, as shown in FIG. 5, a rectangular recess 13 is provided which connects the through holes 8, 9 and 10, 11 shown in FIG. 4, respectively. Therefore, the through hole 8,
9, 10, and 11 form U-shaped holes that pass through them together with the rectangular recess 13. When assembling a zero-phase current transformer in a case having such a coil housing part 1 and a rectangular part 4, the insulation coating at both ends is peeled off and the U-shaped insulated lead wire 14 is made into a bare wire as shown in FIG. Rectangular recess 13 on the bottom
(Fig. 5) through holes 8, 9, and 10, 11
pass through each. Since the rectangular recess 13 on the bottom is slightly deeper than the outer diameter of the lead wire 14, the lead wire 14 does not come out from the bottom surface. Next, the coil wound around the annular core is stored in the storage part 1, and the lead wires at the beginning and end of the winding of the coil are passed through the through holes 9 and 10, respectively, and the bare wires of the lead wires 14 are soldered. , and bend each connection part into a U shape from the base of the lead wire 14 and insert it into the groove 5.
put it inside. Thereafter, the coil storage portion 1 and the groove 5 are filled with resin to fix the coil and the case together. After that, the lead wires 14 passing through the through holes 8 and 10 are bent along the grooves 12 and fixed with embedded resin 15 as shown in FIG.
A zero-phase current transformer is obtained.

As mentioned above, in the zero-phase current transformer of the present invention, the lead wire is U-shaped inside the U-shaped through hole, so even if the lead wire is drawn from the outside, there is no connection between the lead wire and the lead. There is an advantage that no mechanical force is applied to the wire, and that a desired lead wire can be freely attached to the rectangular recess at the bottom.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 are external perspective views of a conventional zero-phase blocked-flow coil, Fig. 3 is an external perspective view of a case for storing the zero-phase blocked-flow coil of the present invention, Fig. 4 is an external perspective view of a cross section taken along line A-A in Fig. 3, Fig. 5 is an external perspective view showing the bottom surface of the storage case for the zero-phase blocked-flow coil of the present invention, and Fig. 6 is an external perspective view of the zero-phase blocked-flow coil of the present invention. In the figures, 1: coil storage section, 2: inner wall, 3:
Outer wall, 4: rectangular portion, 5: V-shaped groove, 6: partition wall,
7: narrow groove, 8, 9, 10, 11: through hole, 12:
Groove, 13: rectangular recess, 14: lead wire, 1
5: Embedding resin.

Claims (1)

[Scope of utility model registration request] This zero-phase current transformer has a case comprising a coil storage section 1 having a cylindrical outer wall 3 surrounding the outer periphery of a circular bottom plate and a concentric cylindrical inner wall 2 inside the cylindrical outer wall 3, and a rectangular section 4 formed integrally with the side of the outer wall 3 and having two pairs of through holes 8, 9 and 10, 11 each connected to a pair of recesses 13 spaced apart and perpendicular to the bottom surface, each pair opening into the bottom surface. A coil is stored in the coil storage section 1 of the case, and lead wires at the start and end of the coil winding are connected in a U-shape to lead wires 14 at the recesses 13.