JPH02704Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a contact electrode used in a defective insulator detection device, particularly a contact electrode used in a device for detecting contamination or deterioration of a tension-resistant insulator of a special high-voltage overhead power transmission/distribution line.

Tension-resistant insulators used for special high-voltage overhead transmission and distribution lines with a nominal voltage of 154 to 500 KV are made of a large number of insulators.
They are connected to a length of about 10 meters and suspended in two or three rows. Such staining or deterioration of tension-resistant insulators can be detected by bringing an electrode into contact with the insulator metal fittings between individual insulators and measuring electrical characteristics such as electric field strength or potential difference between the insulators. FIGS. 1 and 2 show an example of such a detection device.

This detection device is equipped with a sled 1, and this sled 1 is
As shown in Fig. 1, it is a plate-shaped material having a length to ride on the circumferential surface of a plurality of insulators A at the same time, and a width such that it rides on two series of insulators A at the same time as shown in Fig. 2. , has two rows of holes 2, 2 (see Figure 2). Projections 3, 3 are provided on both longitudinal edges of the sled 1 to prevent the insulator A from fitting into these holes 2, 2.

A bearing box 4 is fixed to the lower surface of the center of the sled 1,
A rotating shaft 5 is inserted into the bearing box 4, and rotating plates 6, 6 made of an insulator are fixed to both ends of the rotating shaft.
Most of the rotating plates 6, 6 protrude from the holes 2, 2, and as shown in FIG.
It is designed to be able to rotate freely while being fitted in between. Four contact electrodes 7 are arranged on the outer surface of each rotary plate 6 at regular intervals on a circumference centered on the rotary shaft 5, and protrude parallel to the rotary shaft 5. The spacing between the contact electrodes 7 is equal to the spacing between the insulator metal fittings B, as shown in FIG. Further, an electrode plate 8 integral with each contact electrode 7 is exposed on the inner surface of the rotary plate 6.

Before and after the bearing box 4, there are L-shaped measurement electrodes 9,
9 is provided. Each measurement electrode 9 is fixed to a shaft 10 that penetrates the bearing box 4 in the front-rear direction.
The rotation of the measuring electrode 9 brings one of the two contact points of the measuring electrode 9 into contact with each electrode plate 8 of the contact electrode 7 belonging to one of the rotary plates 6 . The above-mentioned shaft 10 has a gear 11 inside the bearing box 4.
It is connected to the operating shaft 12 via.

The operating shaft 12 extends long in the length direction of the insulator A as shown in FIG.
It also has a grip 13 that can be locked in the extended state.

Now, if you press the grip part 13 from the state shown in Figure 1,
As the sled 1 and the bearing box 4 integrated therewith move forward, the rotating plate 6 rotates and the contact electrode 7 is sequentially moved to the insulator A.
It will fit in between and come into contact with the metal fitting B.

By the way, as mentioned above, if the tension-resistant insulator used in special high-voltage overhead power transmission and distribution lines sometimes bends due to its own weight, the contact of the contact electrode 7 of the above device with the insulator metal fitting B becomes unstable. There is a problem. Therefore, this invention provides a contact electrode as shown in FIG.

That is, the contact electrode 7 according to this invention has the electrode rod 1
4 with a coil spring 15 inserted therein. The electrode rod 14 is formed integrally with the electrode plate 8 , and the electrode plate 8 is fitted onto the rotating plate 6 , and one side thereof is exposed so as to come into sliding contact with the measuring electrode 9 . It is fixed with a tightening nut 17 via a shaped auxiliary wheel 16. Further, a step portion 18 is formed in the middle of the electrode rod 14, and the tip end from the step portion 18 has a small diameter. The coil spring 15 is inserted into this small diameter portion, and one end thereof is connected to the stepped portion 18.
is engaged with. Further, a threaded portion 19 is provided at the tip of the electrode rod 14, and by fitting a nut 20 into this, the coil spring 15 is pressed against the stepped portion 18 and is prevented from coming off.

Since the inner diameter of the central portion of the coil spring 15 is formed to be somewhat larger than the outer diameter of the electrode rod 14, a gap 21 exists between the two.

Therefore, even if the position of the insulator fitting B is shifted as shown by chain lines a and b in FIG. 4 due to the deflection of the insulator row, the coil spring 15 is freely deformed by the gap 21. Therefore, even if the insulator metal fitting B is misaligned, the electrode rod 14 can be reliably brought into contact with the insulator metal fitting B via the coil spring 15.

As described above, this invention has the effect of accurately detecting defective insulators without being affected by any deflection in the insulator row.

[Brief explanation of the drawing]

FIG. 1 is a side view of a detection device using the contact electrode of this invention, FIG. 2 is a sectional front view of the same, and FIG. 3 is a sectional view of the contact electrode of this invention. 7... Contact electrode, 14... Electrode rod, 15... Coil spring, 18... Step portion, 20... Nut, 21
……gap.

Claims (1)

[Scope of utility model registration request] In the contact electrode of a defective insulator detection device that makes contact with the insulator metal fittings of a large number of connected insulators and measures the electrical characteristics between the insulator metal fittings, a coil spring is inserted around the electrode rod, and both ends of the coil spring are engaged with the electrode rod. A contact electrode characterized in that the inner diameter of the central portion thereof is larger than the outer diameter of the electrode rod.