JPH06176648A - Lightning surge protective device - Google Patents

Abstract

PURPOSE:To maintain the insulation support of a wire by preventing damage to an insulator main body should some lightening protector unit be broken with an excess lightning surge and to prevent power interruption by separating the broken lightning protector unit from a discharge line. CONSTITUTION:A lightning surge protective device includes a plurality of lightning protector units 10a-10c each disposed on a cable way and a plurality of interval formation means 20a-20c disposed on an overhead earth-wire to form predetermined intervals among the lightning protector units 10a-10c. Each of the lightning protector units 10a-10c comprises a nonlinear resistor covered with an insulating member, the nonlinear resistor having both end portions held by a pair of electrodes. The interval formation means 20a-20c have a function to shut off a discharge by enlarging said intervals by means of a dynamic discharge that takes place if any of the lighting protector units 10a-10c is broken.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning surge protection device for protecting electric lines from lightning surges.

[0002]

2. Description of the Related Art As a lightning surge protector for protecting an electric line from a lightning surge, both ends are sandwiched by a pair of electrodes as disclosed in Japanese Utility Model Publication No. 64-5304 and Japanese Utility Model Publication No. 1-29334. There is a lightning protection unit in which a non-linear resistor is covered with an insulating member, and the lightning protection unit is built in an insulator that insulates and supports the electric line, or is arranged in parallel outside the insulator. It is attached directly or indirectly to the arm's arm to discharge lightning surge to the arm.

Generally, in an electric line such as a distribution line, an overhead ground wire is provided for the ordinary electric line to catch a lightning surge and suppress the intrusion of the lightning surge to the electric line side. For lightning, it is inevitable that a lightning surge will enter the electric line side. In this case, the lightning surge flows from the electric line through the non-linear resistor through one electrode of the lightning protection unit and is discharged from the other electrode to the arm. As a result, the lightning protection unit extinguishes the shock overvoltage through the excessive current of the lightning surge, and thereafter restores the resistance value to immediately interrupt the discharge of the follow current to restore the insulation to the electric line.

However, when the lightning surge is excessive in the lightning protection unit, the lightning surge is destroyed by the excessive lightning surge, and the insulator for insulating and supporting the electric line is damaged by the follow current discharge, so that the insulating support for the electric line is lowered. Moreover, in the case of multiple lightning, discharge may continue and a ground fault may occur. Therefore, if a follow-up discharge is generated due to damage to the lightning protection unit, a means for interrupting the discharge path that prevents the occurrence of a ground fault by cutting off the discharge path formed by the lightning protection unit from the system by operating due to the follow current. The provided lightning protection unit is disclosed in Japanese Utility Model Publication No. 55-47023 and Japanese Utility Model 3-
No. 51923.

[0005]

By the way, in the lightning protection unit having the discharge path breaking means, since both of them are integrated and assembled as an insulator device inside the insulator, the lightning protection unit is Maintenance, inspection and replacement work in case of damage is very troublesome. Therefore,
The purpose of the present invention is to address such problems.

[0006]

DISCLOSURE OF THE INVENTION The present invention is directed to a lightning protection unit disposed between each electric line side portion and an overhead ground line side portion which are parallel to each other with a predetermined distance therebetween, and face the lightning protection unit. A plurality of gap forming means for forming a predetermined gap at a plurality of locations along each electric line, and the lightning protection unit covers the non-linear resistor whose both ends are sandwiched by a pair of electrodes with an insulating member. The lightning protection unit is characterized in that the space forming means is a space forming means having a function of blocking the discharge by enlarging the space by the continuous flow discharge when the lightning protection unit is damaged. .

[0007]

In the lightning surge protector having such a structure, since the lightning protection unit is arranged on the electric line side and the space forming means is arranged on the overhead ground line side, the lightning surge is prevented from occurring on the electric line side. Is discharged to the aerial ground wire side through the lightning protection unit, and is also reversely discharged from the aerial ground wire side to the electric line side through the lightning protection unit. Therefore, the lightning surge that invades the electric line side is always discharged to the aerial ground wire side through the lightning protection unit, and the electric discharge from the electric line side to the armor side that supports the insulator is prevented, and the insulator is not damaged. The deterioration of the insulation support is prevented, and the reliable insulation support is maintained.

In the lightning surge protection device,
When the lightning protection unit is destroyed by an excessive lightning surge and a follow-up discharge is generated, the interval forming means expands the set interval and disconnects the discharge path. Therefore, even if the lightning protection unit is damaged and a follow-up discharge is generated, a ground fault does not occur, and a circuit breaker is not opened at a substation or the like to cause a system power failure.

In the lightning surge protection device, when the lightning protection unit is damaged and the discharge path is cut off, the lightning protection unit at another location functions in the electric line. Occurs, or even if lightning surges occur continuously (multiple lightning), the other lightning protection units are activated in sequence and the system is maintained in a stable state.

In the lightning surge protection device,
Since both the lightning protection unit and the interval forming means having the function of separating the discharge path are arranged separately and both of them are not incorporated in the insulator, maintenance and inspection of each lightning protection unit and each interval forming means , Each exchange work is easy.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a lightning surge protection device according to an embodiment of the present invention. The lightning surge protection device is used for a three-phase distribution line, and is provided with three lightning protection units 10a, 10b, 10c and three gap units 20a, 20b, 20c. 10c is each insulator 30a, 30b, 30
It is located at c. Each insulator 30a-30c is a utility pole 41.
The armrest 42 is supported by the armrest 42 and extends horizontally. The lightning protection units 10a to 10c have the same configuration as each other, and the insulators 30a to 30c.
Have the same configuration, and the distribution lines 43a, 43 of each phase
b and 43c are supported respectively.

A pole 44 made of metal is erected on the upper end of the electric pole 41, a metal angle 45 is supported at the middle of the pole 44, and a pin insulator 46 is fixed to the upper end of the pole 45. There is. An overhead ground wire 47 is supported on the pin insulator 46. The angle 45 extends horizontally above and parallel to the arm 42, and the gap units 20a to 20c are fixed to the angle 45 at predetermined intervals. Each gap unit 20a-20
Reference character c constitutes the interval forming means of the present invention and has the same structure.

Each of the lightning protection units 10a to 10c is known in itself, and is composed of a non-linear resistor 11, a pair of electrodes 12 and 13, and an insulating member 14 made of an elastic material such as rubber, as shown in FIG. . The nonlinear resistor 11 is a zinc oxide-based resistor, and the electrodes 12 and 13 are fixed to the upper and lower end surfaces of the nonlinear resistor 11, respectively.
Insulating member 14 with the tip of 13 slightly exposed
Is covered by. Arc horns 12a and 13a are fixed to the electrodes 12 and 13, respectively, and the first arc horn 12a projects upward from the upper end of the electrode 12 and the second arc horn 12a.
The arc horn 13a projects horizontally from the lower end of the electrode 13. Each of the lightning protection units 10a to 10c is fixed to the head of the insulator main body 31 forming each of the insulators 30a to 30c and stands up.

Each of the insulators 30a to 30c comprises a tie-top type insulator main body 31, a base metal fitting 32 and a pin metal fitting 33. The base metal fitting 32 is fixed to the outer periphery of the lower end of the insulator main body 31 with cement, and Pin fitting 33
Is fixed to the base metal fitting 32 together with the base metal fitting 32 in a state of being hooked on the center of the lower end of the base metal fitting 32. Each insulator 30a-3
0c is fixed by the pin metal fitting 33 to the arm 42 at a predetermined interval and stands up, and the distribution wires 43a to 43c along the outer peripheral groove of the head of the insulator body 31 are bound to the binding wires 44a to 44c.
Is fixed to and supported by the insulator body 31. In addition, the distribution lines 43a to 43c are obtained by insulatingly coating a conductor,
The bind wires 44a to 44c are the distribution lines 43a to
It is coiled around the outer circumference of 43c.

Each gap unit 20a-20c is shown in FIG.
As shown in FIG. 2, a cylindrical insulator body 21, a fuse wire 2
2, an arc horn 23, and a spiral fold 21a and a spiral groove 21b are formed on the outer circumference of the insulator main body 21. The spiral fold 21a is for draining water, and the fuse wire 22 is spirally wound around the spiral groove 21b. The arc horn 23 is fixed to the lower end surface of the insulator body 21 and projects downward by a predetermined length.
At one end of the fuse wire 22 is fixed. A mounting bolt 24 is fixed to the upper end surface of the insulator body 21, and the other end of the fuse wire 22 is fixed to the bolt 24. The fuse wire 22 is blown by the follow current discharge generated by the destruction of the lightning protection units 10a to 10c by the lightning surge.

The gap units 20a to 20c are fixed by nuts 25 with the bolts 24 inserted in the angles 45, and are arranged at a predetermined horizontal interval above the lightning protection units 10a to 10c. It is facing this. In this state, each lightning protection unit 10a-1
First arc horn 12a connected to the upper electrode 12 of 0c
And arc horn 2 of each gap unit 20a to 20c
3 and 3 are opposed to each other, and both of them constitute a discharge gap G1 while maintaining a predetermined distance. The second arc horn 13a connected to the lower electrode 13 of each lightning protection unit 10a to 10c is located in parallel with the distribution lines 43a to 43c,
A discharge gap G2 is formed by maintaining a predetermined distance from the bind wires 44a to 44c. Lightning protection units 10a-10c
And the gap units 20a to 20c are the distribution line 43.
It is similarly installed at a plurality of locations along a to 43c.

In each of the lightning surge protection devices thus constructed, the lightning protection units 10a to 10c are connected to the distribution line 43a.
Since the gap units 20a to 20c are arranged at the angle 45 on the side of the overhead ground wire 47 on the heads of the insulators 30a to 30c for supporting the to ~ 43c, the lightning surge entering the distribution lines 43a to 43c is prevented. An aerial land 47 through 10a to 10c and gap units 20a to 20c.
When the lightning surge from the overhead ground wire 47 side is reversely discharged to the distribution lines 43a to 43c side through the gap units 20a to 20c and the lightning protection units 10a to 10c as well as being discharged to the line side, it enters the distribution lines 43a to 43c side. This lightning surge must be the lightning protection units 10a to 10c at other locations.
Is discharged again to the overhead ground wire 47 side. For this reason,
Discharge from the distribution lines 43a to 43c to the arm 42 side is prevented, the insulators 30a to 30c are not damaged, and the insulation support for the distribution lines 43a to 43c of the insulators 30a to 30c is prevented from decreasing. Reliable insulation support is retained.

In the lightning surge protection device,
When the lightning protection units 10a to 10c are destroyed by an excessive lightning surge and a follow-up discharge occurs, the gap unit 20
The fuse wires 22 constituting a to 20c are blown. Therefore, the initially set discharge gap G1 is further expanded and separated from the discharge path system formed by the discharge gap G1,
Even if the lightning protection units 10a to 10c are damaged and a follow-up arc is generated, a ground fault does not occur, and a circuit breaker is not opened at a substation or the like to cause a system power failure.

That is, the lightning protection unit 10a is located at that location.
When one or all of 10 to 10c are broken and the discharge path is disconnected, the remaining healthy lightning protection unit functions at other points in the system, so that lightning surge is sporadically generated thereafter in the same system. Even if a lightning surge occurs continuously (multiple lightning strikes), other lightning protection units are activated in sequence and the system is maintained in a stable state.

Further, in the lightning surge protection device,
Since the lightning protection units 10a to 10c and the gap units 20a to 20c are arranged separately and without being built in the insulators 20a to 20c, the lightning protection units 10a to 10c and the gap units 20a to 20c are arranged. Easy maintenance, inspection, and replacement work.

In this embodiment, the lightning protection units 10a to 10c are mounted on the insulators 30a to 30c, and the gap units 20a to 20c are mounted on the angle 45. However, the mounting positions of both units are described. It is also possible to replace each other. This modification also has the same effects as the above embodiment.

[Brief description of drawings]

FIG. 1 is a front view showing an arrangement state of a lightning surge protection device according to an embodiment of the present invention.

FIG. 2 is a side view of the same lightning surge protection device in an installed state.

FIG. 3 is an enlarged front view showing how the lightning protection unit constituting the lightning surge protection device is attached to the insulator.

FIG. 4 is an enlarged front view showing a gap unit that constitutes the lightning surge protection device.

[Explanation of symbols]

10a to 10c ... Lightning protection unit, 11 ... Non-linear resistor,
12, 13 ... Electrodes, 12a, 13a ... Arc horn, 1
4 ... Insulating member, 20a-20c ... Gap unit (space forming means), 21 ... Insulator main body, 22 ... Fuse wire, 2
3 ... Arc horn, 30a-30c ... Insulator, 31 ... Insulator main body, 42 ... Arm, 43a-43c ... Distribution line, 45 ... Angle, 47 ... Aerial ground wire.

Claims (1)

[Claims] 1. A lightning protection unit arranged between each electric line side portion and an overhead ground line side portion which are arranged in parallel with each other with a predetermined distance therebetween, and a plurality of lightning protection units which face the lightning protection unit and form a predetermined distance. The lightning protection unit is a lightning protection unit in which a non-linear resistor whose both ends are sandwiched by a pair of electrodes is covered with an insulating member. The lightning surge protection device, wherein the space forming means is a space forming means having a function of enlarging the space and interrupting the discharge by a follow-current discharge when the lightning protection unit is damaged.