JPS63146307A - Lightning insulator - 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] Purpose of the Invention (Industrial Application Field) The present invention quickly discharges high voltage caused by lightning surge to the ground when it is applied to a power transmission line, and oxidizes the subsequent current. This invention relates to a lightning arrester device that prevents occurrence of ground faults by blocking with a current limiting element made of zinc.

More specifically, due to deterioration of the current limiting element due to unexpected electric shock, moisture absorption, or other causes, it becomes impossible to cut off the follow-on current after a lightning surge, and the high temperature and high pressure arc generated in the current limiting element is immediately released into the atmosphere. This invention relates to a lightning arrester device that reduces damage caused by lightning discharged to the ground.

(Conventional technology) Conventionally, zinc oxide (ZnO) has nonlinear voltage-current characteristics.
A current limiting element consisting of a current limiting element and a pressure relief hole provided around it.
A lightning arrester device has been proposed in which two arcing horns are attached above and below a lightning arrester whose main material is a voltage-resistant insulating tube made of RP.

This lightning arrester device normally prevents ground faults even after lightning surges have been processed by the above-mentioned current-limiting element, but if the current-limiting element deteriorates due to unexpected electric shock, moisture absorption, or other causes, follow-on current is cut off after a lightning surge. If this becomes impossible, in order to minimize damage to the lightning arrester, the arc is blown out from the pressure relief hole and the blown out arc transfers the internal arc to the air arc between the upper and lower arcing horns. It is something.

(Problems to be Solved by the Invention) Although the above-mentioned conventional technology can sufficiently handle a system voltage of 33 to 77 KVO in a high-resistance grounded system and a follow-on current of less than about 10 KA, even large-capacity lines of 66 to 77 KV can be used. Places where the follow-on current reaches 30KA, such as near substations, etc.
Under conditions where the follow-current current reaches 30 to 50 KA, such as in a directly grounded system such as a 500 KV line, it is necessary to increase the thickness of the voltage-resistant insulating cylinder of the lightning arrester device, apply special reinforcement, or Problems include the need to increase the number of pressure relief holes, which increases the size of the lightning arrester, making it difficult to attach poles to existing railway lines, increasing the number of processing steps during manufacturing, and increasing manufacturing costs. There was a point.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes attaching the ground side electrode of the lightning arrester to the support arm of the tower body via a horn mounting bracket and an insulating material, A ground side arcing horn is attached to the horn mounting bracket in correspondence with the ground side electrode,
On the other hand, a charging side arcing horn is attached to the charging side electrode of the lightning arrester through an insulating material, and the grounding side electrode of the lightning arrester and the grounding side arcing horn are connected by a fusible conductor. , a configuration in which the power-supply-side electrode and the power-supply arcing horn are connected by a soluble conductor, and the power-supply side arcing horn and the power transmission line are connected with or without a discharge gap. We are hiring.

(Function) By employing the above configuration, when a lightning surge is applied to the power transmission line, the fusible conductor normally exhibits a current carrying function and the current is discharged through the current limiting element.

However, if a situation occurs in which it is impossible to interrupt the follow-on current after a lightning surge, if the fusible conductor is fused by the follow-on current, an arc discharge will occur between the grounding side electrode of the lightning arrester, the energized side bridge, and the arcing horn. Occur. Due to the electromagnetic force between the current flowing through the arcing horn and the arc discharge current, this arc is quickly transferred between the tips of the arcing horns on the grounding side and the energized side, and the internal arc of the lightning arrester is instantly transferred between the arcing horns. This transitions to an air arc, which significantly reduces the duration of the current flowing through the lightning arrester itself, reducing damage.

(Example) A first example embodying the present invention will be described below with reference to FIGS. 1 to 6.

As shown in FIG. 1, l is the support arm of the tower body,
A pair of left and right horizontal support frames 2.3, a connecting board 4 (Fig. 2) interposed between the tips of the horizontal supporting frames 2.3 and fixed with bolts and nuts, and It consists of an inclined frame 5 connected by bolts and nuts, and a mounting bracket 7 for a tension-resistant insulator fixed to the bottom surface of the tip of the horizontal support frame 2゜3 by a pole 6a and a nut 6b. .

Next, a pair of tension insulator devices connected to both left and right ends of the mounting bracket 7 will be explained based on FIG. 2.

lO is a mounting member 11 whose one end is fixed to the mounting bracket 7;
is a tower-side horn mounting bracket, which is connected to the mounting member 10 so as to be relatively rotatable in the vertical direction.

12 is a tension insulator attached to the mounting member 10, 13 is a power transmission line side horn mounting bracket connected to the tension insulator 12 via a socket clevis link, and 15 is a power transmission line side horn via a stopper 14. This is a power transmission line connected to the mounting bracket 13.

Reference numeral 16 denotes an arcing horn as a discharge electrode on the energizing side, and its base end side is fixed to the power transmission line side horn attachment fitting 13, and its distal end side extends obliquely upward.

Also, the arcing horn 1 of the power line side horn mounting bracket I3
A loft 17 is fixed to the opposite side of the rod 16.
A balance weight 18 is attached to the tip of the arcing horn 16 to balance the weight of the arcing horn 16.
is maintained in a stable state.

Next, the lightning arrester device, which is a characteristic part of the present invention, will be explained.

Reference numeral 8 denotes a mounting arm for a lightning arrester, which also functions as a horn mounting bracket of the present invention, which is attached to the support arm 1 by the bolts 6a and nuts 1-6b, and the support arm is attached in the attached state shown in FIG. A bulging portion 8a is formed at the base end so as to straddle the connecting substrate 4, facing forward and rising upward.

Reference numeral 9 denotes a lightning arrester that is suspended and fixed to the tip of the mounting arm 8 with a bolt via a resin insulating material 19a. The lightning arrester 9 is made of FRP or the like, and includes a voltage-resistant insulation m (as shown in the diagram) with a large number of pressure relief holes, and a current-limiting element (as shown in the diagram) that is housed inside and made of zinc oxide with nonlinear voltage-current characteristics. The electrodes 9a and 9b on the grounding side and energizing side are fitted and fixed to both the upper and lower ends of the voltage-resistant insulating cylinder, and a rubber mold 9C covers the outer periphery of the voltage-resistant insulating cylinder.

20a is fixed to the upper end of the mounting arm 8 and the lightning arrester 9 is fixed to the upper end of the mounting arm 8.
The ring-shaped grounding arcing horn 22a is a fusible conductor that connects the grounding electrode 9a and the grounding arcing horn 22a, and is made of thick copper or aluminum. It is made of a thin plate with a diameter of about 0.3 mm, and is not fused by lightning surges but is fused by follow-up currents.

Reference numeral 21 indicates a resin insulating material 19b for the power supply side electrode 9b.
The arcing horn is fixed with bolts to the mounting member 23 attached through the arcing horn, extends diagonally downward, and faces the arcing horn 16 with a predetermined air discharge gap G.

Reference numeral 20b denotes a ring-shaped energizing-side arcing horn installed in the arcing horn 21 so as to surround the lower end of the lightning arrester 9; 22b denotes a space between the energizing-side arcing horn 20b and the energizing-side electrode 9b; This is a soluble conductor made of the same material as the soluble conductor 22a that conducts electrically.

The operation of the first embodiment configured as described above will be explained.

When a lightning surge is applied to the power transmission line 15, the surge current is discharged in the air from the stop fitting 14, the power transmission line side horn mounting bracket 13, and the arcing horn 16 in the air gap G, and the surge current is discharged from the air gap G to the arcing horn 21 and the power supply side arcing. It reaches the horn 20b, the fusible conductor 22b, and the charging side electrode 9b of the lightning arrester 9. This surge current further passes through the current limiting element (not shown) from the energizing side electrode 9b, flows to the grounding side electrode 9a, and flows through the soluble conductor 22a.
, the grounding side arcing horn 20a, the mounting arm 8, and the support arm 1 to reach the tower body and be grounded.

The fusible conductors 22a and 22b exhibit a current carrying function for lightning surge current.

Subsequent currents that occur thereafter are blocked by the air discharge gap G and a current limiting element (not shown) in the lightning arrester 9.

However, if the current limiting element deteriorates or the follow-on current following an abnormally large lightning surge becomes unblockable, the fusible conductors 22a, 2 at the upper and lower parts of the lightning arrester 9 will be damaged due to the excessive follow-on current.
2b is fused. The resin insulating material 19a provided on the upper part of the lightning arrester 9 insulates between the ground side electrode 9a and the tip of the mounting arm 8, while the resin insulating material 19a provided on the lower part of the lightning arrester 9 Since the material 19b similarly insulates between the energizing side electrode 9b and the arcing horn 21,
゛Between the ground side electrode 9a and the ground side arcing horn 2Oa,
An arc is simultaneously generated between the energizing side electrode 9b and the energizing side arcing horn 20b, but due to magnetic action, this arc moves from the grounding side arcing horn 20a to the tip of the energizing side arcing horn 20b, and both arcing horns 20a.

20b, forming an aerial arc.

Therefore, arc II in lightning arrester 9! Since the duration time is significantly shortened, the responsibility for the heat and pressure of the internal arc of the voltage-resistant insulation tube is greatly reduced, and in this way, the voltage-resistant insulation tube is not damaged even without reinforcement as in the past. Since the reinforcement of the insulating tube is reduced, the lightning arrester 9 can be downsized.

Is the line voltage applied to the power transmission line 15 33~? At 7KV, the follow-on current (short-circuit current) at the time of decommissioning was 10 to 3 near a large-capacity substation.
0KA, 0.1-0.15 seconds, while when the line voltage is 154-500KV, it is 30-50KA, 0.1-0.
．． 2 seconds, and the energy is approximately proportional to the square of the current, making the design of the lightning arrester device extremely difficult. Therefore, as in the above-described embodiments of the present invention, reducing the load on the lightning arrester 9 itself has important design significance.

Furthermore, in the first embodiment, since the base end of the lightning arrester 9 is located above the tip of the support arm 1, rainwater and snow on the support arm 1 are prevented from moving to the lightning arrester 9. Therefore, the anti-fouling properties of the lightning arrester 9 are improved.

Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 10, in which the present invention is embodied in a suspension insulator type lightning arrester device for a power transmission line in which a current limiting element is incorporated in a suspension insulator.

A hanging metal fitting 25 is fixed to the support arm 1 with bolts, a U clevis link 26 is rotatably connected to the hanging metal fitting 25, and a horn mounting metal fitting 28 is rotatably connected to the clevis link 26 with a connecting pin 27. A lightning arrester 32 is suspended from the lower end of the horn mounting bracket 28 by connecting a number of suspension insulators 31 incorporating current limiting elements 44 in series through a connecting pin 29 and a pole clevis link 30. ing. A socket clevis link 33 is connected to the lowermost end of the lightning arrester 32, a horn mounting bracket 34 is rotatably connected to the lower end of the lightning arrester 32 by a connecting pin 35, and a feeder is connected to the lower end of the lightning arrester 32. A wire clamp 36 for supporting the wire 15 is supported.

A pair of arcing horns 37.38 are supported by the pair of horn mounting fittings 28.34, respectively, and a ring-shaped arcing horn 39.38 is supported via a bracket (not shown).
40 is supported.

As shown in FIG. 8, the suspension insulator 31 includes an insulator body 41, a cap metal fitting 42 as a ground side electrode of a lightning arrester 32 fitted and fixed to a head 41a provided on the upper part of the insulator body 41, and a head 4.
It is composed of a bottle fitting 43 that is fitted and fixed in the portion 1a, and a current limiting element 44 that is embedded in the difference part 41b.
The electrode fittings 45 and 46 are fitted to both the upper and lower ends of the cap fitting 42 and the pin fitting 43.
are connected to each other by lead wires 47.

In this second embodiment, the cap fitting 42 of the uppermost suspension insulator 31 serves as the grounding side electrode of the lightning arrester 32, and the socket clevis link 33 serves as the energizing side electrode of the lightning arrester 32.

A protrusion 48 is formed on the cap metal fitting 42, and a fusible conductor 49 is provided between the protrusion 48 and the arcing horn 37.
is connected. On the other hand, a protrusion 48 is also formed on the socket clevis link 33, and a fusible conductor 50 is connected between the protrusion 48 and the arcing horn 38.

As shown in FIG. 10, the fusible conductors 49 and 50 are connected to a storage case 51 made of an inorganic insulator, cap electrodes 52 and 53 that are fitted and fixed to both ends of the case, and a storage case 51 that is made of an inorganic insulator, and cap electrodes 52 and 53 that are fitted and fixed to both ends of the case. A current limiting element 55 made of zinc oxide or the like having non-linear voltage-current characteristics is housed in the cap electrode 52 and connected to the cap electrode 52 and 53 by a lead wire 54, and a coil is connected in parallel to this by a lead wire 56. 57, a fusible wire 58 connected in series to the coil 57, and an explosive 59 provided around the outer periphery of the fusible wire 58.

This fusible conductor 49.50 is connected to the arcing horn 37.
3B by a bracket 60, and the other end is connected to the protrusion 48 by a flexible lead wire 61.

The lower end of the upper horn mounting bracket 28 and the connecting pin 2
9, an insulating material 62 is interposed between the cap metal fitting 42 and the horn mounting metal fitting 28, as shown in FIG. On the other hand, an insulating material similar to the insulating material 62 is interposed between the socket clevis link 33 and the horn fitting 34 to provide insulation between the horn fitting 34 and the socket clevis link 33.

Next, the operation of this second embodiment will be explained.

When a lightning surge is applied to the power transmission line 15, the current flows through the power transmission line clamp 36, the horn mounting bracket 34, the arcing horn 38, the lead wire 54 of the fusible conductor 50, the current limiting element 55, the lead wire 61, and the socket clevis link 33. , pin fitting 4
3. The flow passes through the lead wire 47, electrode fitting 46, current limiting element 44, electrode fitting 45, lead wire 47, cap fitting 42, flows to the upper suspension insulator 3I, and further flows to the uppermost suspension insulator 31.
The fusible conductor 49 passes through the cap fitting 42 and the lead wire 61.
It further flows from the arcing horn 37, the horn fitting 28, the U clevis link 26, and the hanging fitting 25 to the support arm 1.

Subsequent flow is then blocked by the current limiting element 44.55 in the suspended insulator 31 and the fusible conductor 49.50.

However, if the current limiting element 44.55 deteriorates or the follow-on current following an abnormally large lightning surge becomes unblockable, the excessive follow-on current may cause damage to the coil 57 inside the fusible conductor 49.50. Since the commercial frequency current flows through the molten wire 58,
The gunpowder 59 explodes due to the heating of the fusible wire 58, and the storage case 51 made of an inorganic insulator is instantly destroyed, so that an arc is generated between the lead wire 61 and the arcing horns 37, 3B. Due to magnetic action, this arc moves to the tips of the energizing side arcing horn 38 and the grounding side arcing horn 37, and is rapidly transferred between the two arcing horns 37, 38, forming an aerial arc.

Therefore, in this second embodiment as well, the duration time of the arc within the lightning arrester 32 is significantly shortened, and the responsibility for the heat and pressure of the internal arc of the differential portion 41a of the suspension insulator 31 is greatly reduced. Even if the portion 41a is not reinforced, it will not be damaged.Since the reinforcement of the difference portion 41a is reduced in this way, the lightning arrester 32 can be downsized.

Effects of the Invention As detailed above, in the lightning arrester device of the present invention, the burden on the lightning arrester itself against follow-on arcs is reduced. It is possible to reduce the reinforcement of the cylinder, making its diameter thinner, and because the internal arc quickly moves to the upper and lower arcing horns, the number of pressure relief holes provided for releasing the internal arc can be reduced. This has the excellent effect of simplifying the reinforcing structure, making it easy to process, and manufacturing the lightning arrester at low cost. Further, even in the case of a suspended insulator type lightning arrester, there is no need to increase the strength of the differential portion, so that the same effect as the above-mentioned integrated type lightning arrester device can be obtained.

[Brief explanation of the drawing]

Figure 1 is a front view of the entire lightning arrester device showing the first embodiment of the present invention, Figure 2 is a plan view of Figure 1, Figure 3 is a plan view of the lightning arrester device, and Figure 4 is the lightning arrester device. 5 is an enlarged front view of the upper part of the lightning arrester device, FIG. 6 is an enlarged front view of the lower part of the lightning arrester device, FIG. 7 is a front view showing the second embodiment of the present invention, and FIG. An enlarged half-longitudinal cross-sectional view of the suspension insulator; FIG. 9 is a cross-sectional view showing the insulation structure between the horn mounting bracket and the lightning arrester;
FIG. 10 is a cross-sectional view of the fusible conductor. l...Support arm, 8...Mounting arm that also serves as horn mounting bracket, 9.32...Lightning arrester, 9a...Grounding side electrode, 9b...Electrifying side electrode, 19a, 19b, 6
2...Insulating material, 20a...Grounding side arcing horn, 20b...Electrifying side arcing horn, 22a. 22b, 49.50... Fusible conductor, 32... Lightning arrester, 33... Pole clevis link as energized side electrode, 34... Horn mounting bracket, 37.38... Arching horn, 42... Cap metal fitting as a ground side electrode of the lightning arrester 32, 51... Storage case, 55...
・Current limiting element, 57... Coil, 58... Fusible wire, 5
9...Gunpowder, 61...Lead wire.

Claims (1)

[Claims] 1. A horn mounting bracket (8) is attached to the support arm (1) of the tower body.
, 28) and an insulating material (19a, 62), the ground side electrode (9a, 42) of the lightning arrester (9, 32) is attached to the horn mounting bracket (8, 28).
Corresponding to a, 42), the arcing horn (20
a, 37), while the lightning arrester (9, 32) is installed.
An insulating material (19b, 62
) on the charging side through the arcing horn (20b, 38)
The ground side electrode (9a, 42) of the lightning arrester and the ground side arcing horn (20a, 37) are connected by the fusible conductor (22a, 49), and the energized side electrode (9b
, 33) and the arcing horn (20b, 38) on the charging side
are connected by a fusible conductor (22b, 50), and the arcing horn (20b, 38) on the power supply side and the power transmission line (15) are connected with or without a discharge gap. Characteristic lightning arrester device. 2. The lightning arrester (9) is attached to the support arm (1) via a mounting arm (8) that also functions as a horn mounting bracket, and the base end of the lightning arrester (9) is attached to the support arm (
1) The lightning arrester device according to claim 1, wherein the lightning arrester device is located above the lower surface of the tip of item 1). 3. The lightning arrester device according to claim 1, wherein the fusible conductor (22a, 22b) is a thin plate made of copper or aluminum. 4. The charging side electrode (9b) of the lightning arrester (9) faces the arcing horn (16) attached to the power transmission line (15) side with a predetermined discharge gap via the mounting member (23). The lightning arrester device according to claim 1, wherein an arcing horn (21) is attached, and an arcing horn (20b) is attached to the arcing horn (21). 5. The support arm (1) is equipped with a lightning arrester (32) formed by connecting a number of suspended insulator type lightning arresters (31) in series via a horn mounting bracket (28) and an insulating material (62).
) is suspended from the lower end of the lightning arrester (32) via an insulating material (62) and a horn mounting bracket (34).
15) is supported. The lightning arrester device according to claim 1. 6. Cap fitting (42) and arcing horn (37) as the ground side electrode located at the top of the lightning arrester (32)
), and between the socket clevis link (33) and the arcing horn (38) as the energizing side electrode located at the bottom of the lightning arrester (32) (49, 50). ) is a current limiting element (55) housed in a storage case (51) made of an inorganic insulator, a coil (57) connected in parallel to the element, and a current limiting element (57) housed in a storage case (51) made of an inorganic insulator.
The lightning arrester device according to claim 5, comprising a fusible wire (58) connected in series with a fusible wire (58) and an explosive (59) provided on the outer periphery of the fusible wire (58).