JP2586774Y2 - Armor grip type wire gripper - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armor grip type wire gripping portion for gripping a transmission line with an armor rod.

[0002]

2. Description of the Related Art A conventional armor grip for gripping an electric wire by winding an armor rod around the electric wire gripping portion such as a wire gripping portion of a spacer attached to a multi-conductor power transmission line or a wire gripping portion of a damper attached to the power transmission line. The clamp is
Like the electric wire gripping portion shown in FIG. 4 as shown in Japanese Utility Model Publication No. 49-137095, the outer peripheral surface of a metal inverted U-shaped metal core 12 is covered with a rubber mold 13 made of chloroprene rubber or the like. Wire gripping part 1 provided with a plurality of projections 14
5 is connected to one end of a spacer rod 16 by a bolt 17, and the wire gripping portion 15 is fitted to the wire A, and a rubber mold 13 is interposed between the wire A and the inverted U-shaped metal core 12, and each projection on the back surface There is known an armor grip clamp of a spacer S in which an inverted U-shaped grip 15 is gripped by the electric wire A by winding the electric wire A onto the electric wire A through a plurality of armor rods 18 between them.

As shown in FIG. 5, a rubber collar 20 is mounted inside a metal inverted U-shaped bracket 19, and a groove for fitting an armor rod is provided on the back side. The armor rod 18 is inserted into the groove 21 and wound around the electric wire A, so that the armor rod and the inverted U-shaped fitting 19 are in line contact with each other, and the gripper 22 is connected to the electric wire A. There is known an armor grip clamp for a spacer S which is adapted to be attached to a spacer.

[0004]

In a conventional multi-conductor power transmission line to which the spacer S of the conventional armor grip clamp is attached, as shown in FIG.
2, the upper two-conductor power line A1, A2 to which the S3 is attached, and the two-conductor power line A to which the spacers S4, S5 below are mounted.
When the element conductors A2 and A3 come into contact with each other at the point X by causing a short circuit between phases due to galloping and the like, the element conductors A and A4
2 and A3 have the same potential, and a short-circuit current is is directed toward the two element conductors A2 and A3 by the spacers S1, S2, S3 and S3.
4, and flows from the elementary conductors A1 and A4 via S5.
Although the inflow time of this current is depends on the circuit breaker, the current value is generally as large as about 50 KA to 63 KA even in a short time of about 0.1 to 0.35 seconds, so that the energy is large. On the other hand, like the wire gripping portion shown in FIG. 4 described above, a wire gripping portion in which a rubber mold is interposed between a metal inverted U-shaped metal core and the wire, or a wire gripping portion shown in FIG. In addition, in the wire gripping part where the rubber collar is interposed between the gripping part and the electric wire and the armor rod is wound in line with the gripping part, the electric contact between the gripping part and the electric wire is not enough and the current capacity is low. Since it is extremely small, there is a problem that the electric wire A may be melted and damaged by the arc of the short-circuit current. Such a wire erosion accident takes a long time to recover, and galloping that causes the above-mentioned short circuit between phases occurs in winter, so the recovery from the accident is not easy and has become a major social problem. Preventive measures are essential.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide an armor grip type wire gripping portion which does not melt even if a large current flows at the time of short circuit.

[0006]

In order to achieve the above object, the armor grip type electric wire gripping part 11 of the present invention has a metal inverted U having a semicircular inner peripheral surface 2 provided with an uneven strip 3 in its axial direction. A wire-shaped electric wire gripping portion 1 and an outer peripheral surface provided with an uneven ridge 8 fitted on the uneven rim 3 of the semicircular inner peripheral surface 2 of the electric wire gripping portion 1 and an outer layer of the stranded wire conductor A to be gripped on the inner peripheral surface. A metal inverted U-shaped collar 10 provided with a wire fitting groove 9 corresponding to the twisted wire a, wherein the inverted U-shaped collar 10 is detachably mounted inside the electric wire gripping portion 1. It is a feature.

[0007]

The metal inverted U-shaped collar 10 which is detachable from the inverted U-shaped electric wire gripping part 1 is detached from the electric wire gripping part 1 and fitted to the stranded conductor A, and the inner peripheral surface of the collar is fitted to the strand. The groove 9 is matched with the twisted strand a of the outer layer of the twisted conductor A. Next, the inverted U-shaped wire gripping portion 1 is fitted to the outside of the inverted U-shaped collar 10 fitted on the conductor A, and the concave and convex strips 3 on the inner peripheral surface of the wire gripping portion match the concave and convex stripes 8 on the outer peripheral surface of the collar. Fit. Next, the electric wire is wound around an electric wire extending through the armor rod 12 on the outer peripheral surface of the electric wire gripping portion 1 and fixed.
As a result, the conductor, the inverted U-shaped collar on the outer periphery thereof, and the inverted U-shaped electric wire gripper on the outer periphery thereof are fixed to each other in close contact with each other, and the inverted U-shaped electric wire gripper 1 is placed on the conductor A by a metal inverted U-shaped collar 10. , The conductor A is gripped.

As described above, since the metal collar 10 is interposed between the electric wire gripper 1 and the conductor A and gripped, the electrical contact area between the electric wire and the electric wire gripper 1 increases. Even if the power transmission line causes a short circuit between phases and a large current flows through the armor grip type wire gripping portion 11, a sufficient current capacity between the wire and the wire gripping portion 1 can be secured.
There is no erosion of the wire as in the prior art.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a cross section of the electric wire in a state where the armor grip type electric wire gripping portion of the present invention grips the electric wire, and 1 is an armor grip type metal inverted U-shaped electric wire gripping portion, for example, aluminum. Made of alloys and cast iron. This reverse U
The semicircular inner peripheral surface portion 2 of the V-shaped electric wire gripping portion 1 is provided with a plurality of ridges 3 in the axial direction of the semicircle. Reference numeral 4 denotes a plurality of armor rod interval holding projections provided on the outer peripheral surface of the inverted U-shaped wire gripping portion 1. The inverted U-shaped electric wire gripping part 1 connects the connecting part 5 to the spacer rod 6 with bolts 7.

A metal inverted U-shaped collar 10 is detachably mounted on the inner peripheral surface of the inverted U-shaped electric wire gripping portion 1 on which the concave and convex strips 3 are provided. As shown in FIG. 2, the inverted U-shaped collar 10 is formed in an inverted U-shape having a shape fitted to the inner peripheral surface of the inverted U-shaped electric wire gripping portion 1. The reverse U-shaped wire gripping portion 1 is provided with concave and convex stripes 8 which are fitted with the concave and convex stripes 3 on the semicircular inner peripheral surface portion 2 of the inverted U-shaped electric wire grip portion 1. A wire groove 9 that matches the wire diameter and twist pitch of the twisted strand a in the outer layer of A
Is provided.

The metal inverted U-shaped collar 10 is mounted inside the inverted U-shaped wire gripping portion 1 as shown in FIG. The concave and convex strips 8 on the surface are fitted and fitted together to form the armor grip type wire gripping portion 11 of the present invention. An inverted U-shaped collar 10 that fits inside the inverted U-shaped electric wire gripper 1 is detachable from the inverted U-shaped electric wire gripper 1, and the concave and convex strips 3 on the inner peripheral surface of the inverted U-shaped electric wire gripper 1. When the concave and convex stripes 8 on the outer peripheral surface of the inverted U-shaped collar 10 are fitted to each other, mutual rotation is prevented.

The spacer in which the armor grip type electric wire gripper 11 of the present invention configured as described above is connected to the spacer rod 6 allows the electric wire A to be gripped by the electric wire gripper 11 and attached to the two conductors of the transmission line. First, detachable metal inverted U
The U-shaped collar 10 is detached and fitted to one of the two stranded wire conductors A, and the wire fitting groove 9 on the inner peripheral surface of the inverted U-shaped collar 10 is inserted into the stranded wire a of the outer layer of the stranded wire conductor A. To match.
Next, the inverted U-shaped wire gripping portion 1 is fitted to the outside of the inverted U-shaped collar 10, and the uneven stripes 3 of the semicircular inner peripheral surface portion 2 of the wire gripping portion 1 are formed on the outer peripheral surface of the inverted U-shaped collar 10. Concavo-convex strip 8
To match. Next, the armor rod 12 is passed between the protrusions 4 on the outer peripheral surface of the electric wire gripping portion 1 and both ends of the armor rod are wound around the electric wires on both sides of the electric wire gripping portion 11 as shown in FIG. In this manner, the inverted U-shaped wire gripping portion 1 grips the conductor A with the metal inverted U-shaped collar 10 interposed on the stranded conductor A. The armor grip type wire gripping portion 11 at the other end of the spacer rod 6 is gripped by the other wire of the two conductors in the same manner as described above.

As described above, the metal inverted U-shaped collar 10 having the wire fitting groove 9 corresponding to the twisted wire a of the outer layer of the twisted wire conductor A is interposed between the wire A and the wire gripping portion. 6, the electric contact area between the electric wire and the electric wire gripping portion 1 is increased and the electric resistance is reduced.
As shown in (1), even if the transmission line causes an interphase short circuit due to galloping or the like, the current capacity between the electric wire and the electric wire gripping portion 1 can be sufficiently ensured, so that the conventional electric wire melts down. Nothing.

In the case where the electric wire for mounting the spacer constructed as described above is a multiconductor, the twisted phases of the strands a of the outer layer of each conductor are different even if the mounting positions at both ends of the spacer are the same corresponding positions. Since the detachable inverted U-shaped collar 10 can be removed, the position of the inner surface of the inverted U-shaped collar 10 is adjusted by shifting the position of the inverted U-shaped collar 10 in the longitudinal direction of the electric wire for each conductor. The wire fitting groove 9 can be matched with the phase of the twisted element wire a of each conductor outer layer. Note that it is not necessary to consider the twist pitch of such a stranded wire conductor when mounting it on a single conductor.

The above-mentioned inverted U-shaped collar 10 is the same as that shown in FIG.
Although the stranded conductor A is described as a normal stranded wire in the embodiment shown in FIG. 1, a part of the outermost layer of the stranded wire conductor is formed as a modified segment wire like a so-called finned wire of a low noise wire. The reverse U-shaped collar 10 can be applied to a finned electric wire having a fin-shaped protrusion formed in the longitudinal direction on the outer peripheral surface of the stranded wire conductor. In this case, on the inner peripheral surface of the inverted U-shaped collar 10, a plurality of fin-like protrusion fitting grooves are provided so that fin-like protrusions in the longitudinal direction of the outer peripheral surface of the finned wire can be fitted. Regardless of where the fin-like protrusion is located on the outer periphery of the stranded conductor, any one of the plurality of fin-like protrusion fitting grooves on the inner peripheral surface of the inverted U-shaped collar 10 can be fitted and fitted. The mounting position of the inverted U-shaped collar 10 on the peripheral surface of the finned electric wire can be set at a predetermined position.

Although the armor grip type electric wire holding portion of the present invention configured as described above has been described as the electric wire holding portion of the spacer to be attached to the multiconductor power transmission line, it is applicable not only to the spacer but also to the electric wire holding portion of the damper. Can be applied.

[0017]

As described above, the armor grip type electric wire gripping part of the present invention is such that the metal inverted U-shaped collar is fitted to the transmission line conductor, and the wire fitting groove on the inner peripheral surface of the collar is formed in the outer conductor layer. The inverted U-shaped wire gripping part is fitted on this inverted U-shaped collar, and the concave and convex strips inside the wire gripping part and the concave and convex strips on the outer periphery of the collar are fitted and engaged with each other, Since the armor rod is wound around the wire gripping portion to grip the wire, the conductor, the inverted U-shaped collar on the outer periphery thereof, and the inverted U-shaped wire gripping portion on the outer periphery are tightly fixed to each other. ,
A metal collar is interposed between the conductor and the wire grip to increase the electrical contact area, so even if the transmission line causes a short circuit between phases and a large current flows through the wire grip,
Melting of the electric wire can be prevented.

Also, since the inverted U-shaped collar made of metal is detachably attached to the inverted U-shaped wire gripping portion, the phase of the twisted element wire of the conductor outer layer is changed for each conductor at both ends of the spacer.
The element fitting grooves on the inner peripheral surface of the character-shaped collar can be brought into close contact with each other so that the electrical contact is good and a sufficient current capacity against short-circuit current can be secured.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the present invention.

FIG. 2 is a perspective view of an inverted U-shaped collar according to an embodiment of the present invention;

FIG. 3 is a top view showing a use state of the embodiment of the present invention;

FIG. 4 is a side view of a conventional AG clamp.

FIG. 5 is a top view of a conventional AG clamp.

FIG. 6 is an explanatory diagram of a short-circuit state of a transmission line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Inverted U-shaped electric wire gripping part 2; Inner peripheral surface 3, 8; Concavo-convex stripe 9; Wire fitting groove 910; Inverted U-shaped collar 11; Armor grip type electric wire gripping part A; Twisted strand

Claims (1)

(57) [Scope of request for utility model registration] 1. A metal inverted U-shaped electric wire grip portion provided with an axially concave and convex strip on an inner peripheral surface, and a concave and convex strip to be fitted to the concave and convex strip of the inverted U-shaped electric wire grip portion on an outer peripheral surface. A metal inverted U-shaped collar provided with a wire fitting groove corresponding to the twisted wire of the conductor outer layer on the peripheral surface, and attaching / detaching the inverted U-shaped collar inside the inverted U-shaped wire gripping portion. An armor grip type wire gripping part characterized by being freely mounted.