JPS60197111A - Electric wire grip part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a wire gripping part for an overhead power transmission line or the like, and particularly to a so-called armor grip type wire gripping part such as a spacer, damper, twist preventer, etc.

(Prior art) As this kind of electric wire gripping part, for example,
As seen in Publication No. 095, a wire gripping body consisting of a metal engaging part (usually aluminum) that engages with an electric wire and a rubber-like elastic body covering the inner and outer surfaces of the engaging part is attached to an electric wire. For example, a wire gripping part of a spacer is known, in which a plurality of helical rods such as armor rods (usually made of aluminum) are wrapped around the outer periphery of the wire gripping body and gripped and fixed to the wire.The rubber-like elastic body is made of metal. It works to prevent contact wear between the engaging part and the electric wire and vibration of the electric wire.

However, the metal engaging portion and the electric wire engaged therewith are in contact with each other via a rubber-like elastic body, and the electric resistance of the rubber-like elastic body is generally 100Ω to 2MΩ, and the rubber The thickness of the shaped elastic body is 2.5 mm
~1. Otnm and 1. The following problems arise because of the C.

That is, vibrations such as gear-ropping vibration and sleed jump occur in the electric wire to be gripped, for example, the electric wire of the human phase, and the electric wire of the other phase, for example, the B phase, comes into contact with the part of the spacer body or the like that is electrically connected to the metal engaging part. When a phase-to-phase short circuit occurs, the B-phase current flows between the spacer body, the metal engagement portion, the rubber-like elastic body, and the
Flows into the A-phase wire. Generally, in such a case, the circuit breaker will operate and the voltage will be approximately 0. Although the current is interrupted within ~0.75 seconds, the current flowing through the wire is usually 20 KA or more, which causes local arc discharge between the countercurrent engagement part of the circuit breaker and the wire. There was a risk that the electric wire would melt and break.

(Object of the Invention) In view of the above-mentioned circumstances, the present invention provides a so-called armor grip type electric wire gripping part that prevents local arc discharge from occurring even when electric wire current of a different phase flows through the metal engaging part. The purpose is to provide the following.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention has the following 51-piece structure.

That is, the present invention engages an electric wire with an electric wire gripping body consisting of a metal engaging part that engages with an electric wire and a rubber-like elastic body coated on the inner and outer surfaces of the engaging part, and also moves a helical rod outside the electric wire gripping body. In the gripping part of the electric wire that is wrapped around the electric wire and gripped and fixed to the electric wire, the metal engaging part and the electric wire are configured to be electrically at the same potential by a bypass circuit connecting them.

(Example) An example of the present invention will be described based on FIGS. 1 and 2.

The figure shows an example in which the present invention is applied to a wire gripping part of a wire twist preventer.

In the figure, (1) shows the electric wire, (2) shows the weight, and (3) does not show the electric wire holder for attaching the weight (2) to the electric wire (1).

The wire gripping body (3) is attached to a metal engaging portion (61 (71) and the metal engaging portion f (il) Consists of a rubber-like elastic body (81+91) coated on the inner and outer surfaces of +71.

The arm T41 +51 is made of aluminum, and its lower end is swingably attached to the opposite side of the weight (2) via bolts, and its upper end is bent into a hook shape and formed to engage with the electric wire fl+. A metal retaining portion fGl (71) is provided.The inner and outer surfaces and side surfaces, that is, the entire surface of this engaging portion (61+71) are integrally covered with a rubber-like elastic body (81 (91) by molding. Elastic body +8
) As (9), chloroprene rubber, silicone rubber, etc. are adopted.

Furthermore, a metal engaging portion f61 covered with a rubber-like elastic body (81+91) provided at the upper end of the arm (41 (51)
(7) are arranged so that their opening directions face each other, and when they are engaged with the electric wire (11), they are arranged adjacent to each other on the electric wire (]) as shown in Fig. 2. Then, their relative positions are shifted.

The wire gripping body (3) constructed in this way is shown in Figure 2 and Figure 2.
As shown in the figure, the metal engaging parts f+31 to +71 coated with rubber-like elastic bodies +8+ +91 are suspended from (engaged with) the electric wire (11), and the outer periphery of this electric wire grip (3), that is, the rubber-like elastic body +81 +9+ A plurality of edge cal rods 0 (9) are wound around the electric wire fi+ and gripped and fixed to the electric wire (1) to form an electric wire gripping part. In this state, the electric wire (1) and the metal engagement The joining part f61 (71 is connected to the rubber-like elastic body (8) (91). Therefore, the two are insulated.

Furthermore, the present invention includes the electric wire 111 and the metal engaging portion t6) [7]
The two are electrically at the same potential through a bypass circuit (111) that connects them.

As shown in Figure 1, the bypass circuit all is made of a conductive metal plate (17J, for example, made of an aluminum plate) whose lower end is in elastic contact with the inner surface of both arms (4) (5), and whose two ends are in contact with the electric wire (1). Become.

The contact structure with the electric wire (11) at the upper end of the conductive metal plate Q2 is to bend the upper end of the conductive metal plate Q2 into an open loop shape as shown in FIG. 1) houses the middle part of the conductive hemical rod 03, and at the same time presses the loop-shaped part of the conductive metal plate f13 against the electric wire +11 in the hemical rod (13) to ensure its conductivity. Therefore, the electric wire (1) and the metal engaging parts (6) and (7) are the electric wire (1) - conductive metal plate (1 4 - m t/11 + 51 - metal engaging part (Gl)
(The circuit of 71 and the electric wire (11 - conductive helical force rod αJ - conductive metal plate 02 - arm (4) (5) - metal engagement part (6) (force) electrically It is at electric potential.

(Second Embodiment) Next, a second embodiment of the present invention will be described based on FIG. 3.

The figure shows an example in which the conductive metal plate Oz in the bypass circuit 01) of the wire twist preventer according to the present invention shown in FIGS. 1 and 2 is modified.

That is, what is shown in FIG. 3 is a conductive metal plate (17I
The lower end is held by only one arm (4), the upper end is bent into an open loop, and the conductive helical rod 031 wound around the electric wire (]) is housed in this open loop. The pusher was brought into contact with the electric wire +11.

(Third example) Furthermore, a third embodiment will be described based on FIG.

The figure shows an example in which the present invention is applied to a wire gripping part of a spacer as shown in the above-mentioned Japanese Utility Model Application Publication No. 49-'137095.

In FIG. 4, (11 is an electric wire, 04 is a spacer frame, and 03 is an electric wire gripper which is movably protruded from the spacer frame 0).

The electric wire holder (2) includes a pedestal Oa protruding from the spacer frame Oz, a base portion of which is movably attached to the pedestal Oa, and an arm having a metal engagement portion 09 that engages with the electric wire (11) on the upper part. (1) and a rubber-like elastic body OD coated on the inner and outer surfaces of the metal engagement portion C351.

As shown in FIG. 4, the wire gripping body C configured in this manner has a metal engaging portion 0 (covered with a rubber-like elastic body 071).
At the same time, engage the electric wire (1) with the electric wire gripper (c).
A plurality of hemical rods are wound around the electric wire (1) from the outer periphery of the electric wire (1), and gripped and fixed to the electric wire (+1) to form an electric wire gripping part.

Further, in FIG. 4, port 1 indicates a conductive helical rod that constitutes a bypass circuit that conducts electrical wire (1) and the metal engaging portion C351 and makes both of them at the same potential.

This conductive helical rod 0I has both ends connected to electric wires (1
1, and the intermediate portion is wrapped around the base of the metal engaging portion C3S. Therefore, the electric wire (1) and the metal engaging portion I3'il are connected to the electric wire (11-helical rod C11-
The circuits of the metal engaging parts are electrically at the same potential.

In addition, the bypass circuit that connects the electric wire and the metal engaging part is
Not limited to those shown in the above-mentioned embodiments, any suitable means may be adopted, such as simply connecting the electric wire and the metal engagement part with a bond wire, or using a rubber-like elastic material on the inner surface of the metal engagement part. Means such as a projection that penetrates the body and contacts the electric wire can be adopted, and in short, it is configured to connect both the electric wire and the metal engagement part so that they are electrically at the same potential. All you have to do is stay there.

Furthermore, the present invention can also be applied to dampers.

(Effects of the Invention) As explained in Section 2 below, the present invention provides an electric wire gripping body made of a metal engaging portion that engages with an electric wire and a rubber-like elastic body coated on the inner and outer surfaces of the engaging portion. At the wire gripping portion where the helical rod is gripped and fixed to the wire by applying the helical rod to the wire from the outer periphery of the wire gripping body while engaging, the metal engaging portion and the wire are electrically synchronized by a bypass circuit connecting them. Since the electric potential is generated as a potential, even if the electric wire vibrates and the electric wire of another phase comes into contact with the spacer frame, the arm of the anti-twist device, etc., and the electric current of this other phase flows to the metal engagement part, it will not flow through the rubber-like elastic body. Very little of it flows to the wire to be gripped, and most of it flows to the wire to be gripped after passing through the bus circuit. Therefore.

There is almost no chance of localized arc discharge occurring between the metal engaging portion and the wire to be gripped (thereby, melting of the wire, etc. will not occur).

Moreover, since a rubber-like elastic body is interposed between the electric wire and the metal engaging part and between the metal engaging part and the helical rod, it is possible to suppress the vibration of the electric wire and to keep the electric wire young. can prevent contact wear between the helical rod and the helical rod.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the wire gripping part of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a front view showing a second embodiment.
FIG. 4 is a partially cutaway front view of the main part of the third embodiment. (1) Electric wire, (2) Weight, (3) Electric wire grip for (to), (4) (51C361-・7-, +6)
+710! il=Metal engagement part, +81 (91C3
7)...Rubber-like elastic body, (II (to)...Helical rod, aυ...Bypass circuit, oto-Conductive metal plate, o
30 conductive helical rods, G spacer frame, (2)... pedestal. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] An electric wire gripping body consisting of a metal engaging part that engages with the electric wire and a rubber-like elastic body coated on the inner and outer surfaces of the engaging part is engaged with the electric wire, and a helical rod is wound around the electric wire from the outer periphery of the electric wire gripping body. At the wire gripping part that is attached and fixed to the wire,
The wire gripping portion is characterized in that the metal engaging portion and the electric wire are electrically at the same potential due to a bypass circuit that connects them.