JP2604781Y2 - Insulator protection device with current limiting element - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an insulator protection device with a current limiting element which is attached to an insulated electric wire on a charging part side, so that it can operate properly in a lightning surge in particular. Related to the configuration.

[0002]

2. Description of the Related Art In recent years, in a high-voltage distribution line, an insulator protector with a current limiting element has been used for the purpose of protecting the insulator from damage and disconnection of the insulated wire.

[0003]

Among the protection devices described above, in particular, those in which the protection device is attached to the insulated wire on the charging section side, as shown in FIG.
Are mounted above the outer peripheral surface of the insulator body of the support insulator 2. The mounting (mounting) position of the discharge electrode 6 is determined by the flash voltage value between the discharge electrode 6 and the metal fitting 2c (arm) of the insulator.
It is impossible to move the position further to the lower side of the outer peripheral surface of the insulator because the insulation class (insulation performance) of the line is substantially reduced to a specified value or less.

Accordingly, in the illustrated protection device,
It is attached in a state where the distance between the binding wire or winding grip 23 and the discharge electrode 6 is relatively short.

[0005]

As described above, in the case where the distance between the binding wire or the wrapping grip 23 and the discharge electrode 6 is relatively short, the lightning surge is prevented.
When the insulator surface (peripheral surface) is contaminated during this period and the insulation is in a reduced state, the bind wire (or wrapped grip) 23-discharge electrode is caused by the transmitted lightning surge. A flash is generated between the wires 6, and the discharge device is discharged (flash) to the ground through a discharge (flash) path of the bind wire or the wrapped grip 23-discharge electrode 6-discharge gap G-mounting fitting 2c. May not pass through the current-limiting element in the current-limiting element unit 3. In such a non-passing (non-operating) state, the follow-on current of the commercial frequency cannot be cut off by the current-limiting element, so that the follow-current arc may cause damage to the insulator or disconnection of the insulated wire. Becomes

An object of the present invention is to provide the above-described discharge (flash) when:
The present invention proposes a configuration devised so that a lightning surge can always pass through a current limiting element of a protection device and interrupt a downstream current by the element.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a lower portion of a supporting insulator (2) is supported by a grounding-side mounting member (2c) such as an arm. (2) supporting the insulated wire (15) on the head by a metal support member (23) such as a bind wire or a winding grip;
A ring-shaped discharge electrode (6) is provided on the outer periphery of the body of the support insulator (2) located below the insulated wire (15), and is provided at the upper end of the support insulator (2) located above the insulated wire (15). A current limiting element unit (3);
The charging section side electrode is electrically connected to the insulated wire (15) and the ground side electrode is electrically connected to the discharge electrode (6), respectively, and the discharge electrode (6) is connected to a ring-shaped mounting section made of an insulating material. (6
long form deep grooves and (6f) in the vertical direction lower end is open upper end which is closed in a), the configuration installed discharge fittings only (6b) to the upper rear portion of the deep groove (6f), the Discharge fitting
A gap formed by a deep groove (6f) is formed below the portion (6b).
Then, the inner surface of the mounting portion (6a) in the gap is discharged.
Between the metal part (6b) and the metal support member (23)
The discharge metal part (6b) and the metal
The flashover voltage between the metal support members (23) is limited by the current limiting element (1).
It is characterized in that it is higher than the limit voltage value of 1) .

[0008]

The discharge metal part (6b) of the discharge electrode (6) mounted on the insulator (2) is provided in the deep part inside the deep groove (6f) formed in the insulating mounting part (6a). Discharge metal part (6b) and metal supporting member (2
3) The creepage distance between them becomes longer.

[0009] Therefore, the dielectric strength (flash voltage value) during this time can be made higher than the limiting voltage of the current limiting element (11), so that the lightning surge can reduce the current limiting element (1).
Be sure to pass 1).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, description will be made with reference to FIGS. 1
The insulator protection device according to the present invention is mounted with the current limiting element unit 3 mounted on the head 2a of the supporting insulator 2. As shown in FIG. 4, the current limiting element unit 3 and the insulating holder-4 are provided.
, Connector 5, discharge electrode 6, charging side electrode 7, charging side auxiliary electrode 8, ground side electrode 9, and ground side auxiliary electrode 1.
It is roughly configured from 0.

As described above, the current limiting element unit 3 includes a current limiting element 11 composed of a columnar voltage non-linear resistor mainly composed of zinc oxide (ZnO) and an insulating inner cylinder 12 composed of FRP or the like. , A charging electrode 7 connected to both end surfaces thereof, a ground electrode 9, a fastening pin 13, a rubber, a synthetic resin, and the like that integrally cover the outer peripheral surfaces of the element 11 and the electrodes 7 and 9. And the insulating covering member 14. The charging electrode 7 and the connector 5 are connected by a lead-shaped charging auxiliary electrode 8, and the ground electrode 9 and the discharging electrode 6 are connected by an L-shaped ground auxiliary electrode 10.

As shown in FIGS. 9 to 13, the insulating holder 4 made of rubber or synthetic resin comprises an attaching portion 4a and a holding portion 4b, and the holder 4 is shaped like a cap. The formed attachment portion 4a is fitted on the head 2a of the insulator body of the support insulator 2, and the current limiting element unit 3 is fixed to the holder 4b of the fitted holder. It is held in a state of being sandwiched by the portion 4c. After all, the current limiting element unit 3 is the head 2a of the support insulator 2.
It will be placed on the top.

In the above description, the connector 5 is used to electrically connect one end of the charging section side auxiliary electrode 8 to the insulated wire 15. a biasing bolt 16 intended tightening on the gel by an unillustrated operating tool from the lower side, a needle electrode 17a of retainer member 17 shown in FIGS. 14 and 15 by the clamping protrudes upward of the fitting 17 is pushed upward It breaks through the insulating coating 15a of the insulated wire 15 and is electrically connected to the core wire 15b.

Reference numeral 18 denotes a seal material such as a self-sealing tape for closing the hole formed by the needle electrode as described above, and is formed of an elastic material. 19 is the tightening bolt 1 after tightening
6 is a loosening prevention paint for preventing loosening, and is applied to the screw portion 16a.

Reference numeral 20 denotes an adapter for controlling a tightening torque made of a synthetic resin. A fitting portion 20a for fitting to the head 16b of the bolt 16 is fixed to an upper surface of the adapter, and an operating portion 20b is formed on a lower surface. I have. At the time of use, when the fitting portion 20a is fitted to the head 16b of the bolt 16, and an operating tool (not shown) is fitted to the operating portion 20b and tightened, the weak point portion 20c is cut with a specified value of torque. Has become.

Reference numeral 21 denotes a connector cover made of an insulating member, and reference numeral 25 denotes an insulated terminal cover. As shown in FIG. 6, the discharge electrode 6 has a ring shape as a whole, and has an insulating mounting portion 6a made of a ring-shaped rubber or a synthetic resin and a ring-shaped discharge portion fixed to the mounting portion 6a. The mounting portion 6a is configured so that the mounting portion 6a can be opened and closed together with the two-part discharge metal portion 6b in which the connecting portion 6d opposite to the thin portion 6c is fixed to the mounting portion 6a.

A hook 6k and a hook hole 6m are formed in the connecting portion 6d, and are connected by engaging these. Further, a plurality of abutting portions 6j which are formed to protrude inward at appropriate intervals are formed on the mounting portion 6a of the discharge electrode 6, and only the abutting portion 6j is in close contact with the outer peripheral surface 2b of the insulator. A space a formed by the mounting portion 6a other than the contact portion 6j and the outer peripheral surface 2b of the insulator body.
Thereby, the effect of washing the outer peripheral surface 2b of the insulator body during rainfall is not impaired.

Further, as shown in FIG. 8, the mounting portion 6a has
A deep groove 6f which is open at the lower surface 6e of the mounting portion 6a, extends upward and is closed at the upper end is formed.
The discharge fitting part 6b is fixedly provided at the inner part 6g of the f.
Thus, the discharge metal part 6b and the binding wire 23 (or the winding grip) can be connected without changing the creepage distance between the discharge metal part 6b of the discharge electrode 6 and the grounding-side mounting metal part 2c (or the arm 22). Is made to be as long as possible.

With such a configuration, the flash voltage between the discharge electrode 6 and the bind wire 23 (or the winding grip) can be made higher than the voltage limit of the current limiting element 11.

The ground-side auxiliary electrode 10 is made of a rigid body such as a stainless steel wire, and is entirely bent into an L-shape.
The outer peripheral surface is stress-coated with an insulator 10a such as rubber.
As shown in FIG. 7, one end 1
0b is connected to the discharge fitting 6b via the connection fitting 24,
The other end is screwed to the ground electrode 9. In this case, the unit insulating cover member 14 and the insulator 10
a) are bonded and integrated at the same time.

With the above arrangement, the protection device 1 is insulated by the discharge gap G formed between the discharge electrode 6 and the mounting bracket 2c during normal times, that is, when there is no lightning surge propagation, and the current limiting element 11 Is inactive.

In this state, the next time a lightning surge propagates, the surge causes the current limiting element 11 in the current limiting element unit 3 to operate, causing a flash to occur at the discharge gap G and causing the surge. The insulated wire 15-connector-5-charging auxiliary electrode 8
The discharge is performed to the ground through the path of the charging electrode 7, the current limiting element 11, the ground electrode 9, the ground auxiliary electrode 10, the discharge electrode 6, the discharge gap G and the mounting bracket 2 c. Therefore, the lightning surge passes through the current limiting element 11 as described above, so that the commercial current is interrupted by the current limiting element 11.

The above description is for the case where the lightning surge has a positive polarity. However, when the lightning surge has a negative polarity, it is discharged in the opposite direction to the case where the lightning surge has the positive polarity.

[0024]

According to the present invention, the discharge electrode mounted on the upper outer peripheral surface of the insulator has a ring-shaped discharge metal fitting fixed to a position deep inside the deep groove of the insulating mounting portion. Therefore, the creepage distance between the discharge electrode and the bind wire or the winding grip becomes long, thereby increasing the dielectric strength (flash voltage value) between the discharge electrode and the bind wire (or the winding grip), which is a protective device. Can be maintained higher than the limiting voltage of the current limiting element, so that the current limiting element of the protection device operates earlier when the lightning surge propagates, so that the lightning surge can replace the element. Since it always passes, the downstream flow is cut off by the same element, so that the protection of the insulator from being damaged or the disconnection of the insulated wire can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of an insulator protection device according to the present invention, in a state where the insulator protection device is used;

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a front view of a state where a part of the insulator protection device of the present invention is broken.

FIG. 5 is an assembled state diagram of a discharge electrode and a ground-side auxiliary electrode.

FIG. 6 is a bottom view of FIG. 5 with a part thereof broken.

FIG. 7 is a partially enlarged view showing a connection state between a discharge fitting and a ground-side auxiliary electrode.

FIG. 8 is an enlarged sectional view taken along line BB of FIG. 6;

FIG. 9 is a front view of an insulating holder.

FIG. 10 is a plan view of FIG. 9;

FIG. 11 is a bottom view of FIG. 9;

FIG. 12 is a side view of FIG. 9;

FIG. 13 is a sectional view taken along line AA of FIG. 9;

FIG. 14 is a front view of a connector.

FIG. 15 is a side view of FIG. 14;

16 (a) is a sectional view, FIG. 16 (b) is a plan view, and FIG. 16 (c) is a bottom view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator protection device 2 Support insulator 2c Attachment fitting part 3 Current limiting element unit 6 Discharge electrode 6a Insulation mounting part 6b Discharge fitting part 6f Deep groove 6g Deep part 15 Insulated wire 22 Arm clamp 23 Bind wire or wrapped grip G Discharge gap

Claims (1)

(57) [Scope of request for utility model registration] 1. A lower part of a supporting insulator (2) is supported by a ground-side mounting member (2c) such as an arm, and a metal supporting member such as a binding wire or a winding grip is attached to a head of the supporting insulator (2). The insulated wire (15) is supported by (23), and a ring-shaped discharge electrode (6) is provided on the outer periphery of the body of the support insulator (2) located below the insulated wire (15). A current-limiting element unit (3) is provided at the upper end of a support insulator (2) located above the power-supply insulator. The discharge electrodes (6) are electrically connected to the electrodes (6), respectively.
A vertically long deep groove (6f) having a lower end opened and an upper end closed at a ring-shaped mounting portion (6a) formed of an insulating material.
Is formed and configured by installing the discharge fitting portion only (6b) to the upper rear portion of the deep groove (6f), the discharge fittings (6
b) forming a gap consisting of a deep groove (6f) on the lower side,
Dispose the inner surface of the mounting portion (6a) in the gap with a discharge fitting portion
Creepage distance between (6b) and the metal support member (23)
The discharge metal part (6b) and the metal support
The current limiting element (11) controls the flash voltage between the holding members (23).
An insulator protection device with a current limiting element characterized by having a voltage higher than a voltage limit value .