JPS645775Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to protect the high voltage distribution line from being insulated when an abnormally high voltage is applied to the high voltage distribution line, which is fixed to the insulator. The present invention relates to a structure that can prevent an insulator from being damaged by an arc generated between a damaged part and a cross arm of a utility pole.

In the conventional insulator damage prevention structure, an arcing horn is attached to the high voltage distribution line in a corrugated shape, and when the abnormal high voltage mentioned above is applied, an arc is generated between the arcing horn and the cross arm to prevent damage to the insulator. However, when an arc occurs, a follow-up current is generated, and the insulator is destroyed by uneven heat.

Therefore, the present invention has been developed to eliminate the above-mentioned problems, and is capable of preventing damage to the insulator due to the above-mentioned arc, and also prevents damage to the insulator by quickly blocking follow-on current and preventing damage to the insulator due to it. It seeks to provide structure.

The drawings showing the embodiments of the present application will be described below. Reference numeral 1 denotes the arm of a utility pole, which, as is well known, is grounded to the earth via a grounding wire. Reference numeral 2 denotes a high-voltage pin insulator (for example, a No. 10 solid high-voltage pin insulator) as an example of an insulator, one end of which is fixed to the cross arm 1 with a support bolt 3 and a nut 4, and the other end is fixed to an electric wire. As is well known, a high-voltage power distribution line 5, which is illustrated as a charging section, is fixed to the section with a binding wire 6. The high voltage distribution line 5 is an insulated wire. Next, the current limiting device 7 will be explained. Reference numeral 8 denotes a support piece, which is fixed to the insulator metal fitting 2a of the high-voltage pin insulator 2 by a fixture 9. This support piece 8 is formed of a metal material. 10 is an insulated container,
Inside it, there is a current limiting element 13, an auxiliary electrode fitting 14,
15 mag is equipped. The insulating container 10 is made of an insulating material such as epoxy resin or porcelain,
Furthermore, multiple flanges are formed on the outer peripheral surface to increase the creepage distance between the upper and lower terminals. Further, the insulating container 10 is closed with a seal plug 11 via an O-ring 12. The insulating container 10 and the like are fixed to the support piece 8 with a lower terminal 16 connected to the electrode fitting 14 and a nut 17. 49, 49 are insulating washers. The current limiting element 13 is a sintered body containing zinc oxide as a main component, and has excellent nonlinearity (voltage nonlinearity). Reference numeral 19 denotes a flashing member (also called an arcing horn), which is fixed via a support piece 20 to the upper terminal 18 attached to the auxiliary electrode fitting 15. This arcing horn 19 is formed in an annular shape from a material with low electrical resistance such as copper or brass, and has a slight air gap between the high voltage distribution line 5 and the cross arm 1 on the outer peripheral surface of the high voltage pin insulator 2. They are placed separately.

Next, reference numeral 21 indicates a ground fault display device, which is attached to a mounting bracket 22a integrally formed with the support piece 8 and a mounting bracket 22b formed separately by bolts 23a and nuts 23b. In this ground fault accident display device 21, 24 is a case exemplified as a base body, which is formed of an insulating material (for example, synthetic resin) into the shape shown in the figure, and has an operating mechanism storage section 25 and a display body storage section inside. 26 are formed.
In the storage section 25, 27a and 27b are case 2
4, and its upper end is attached to the lower end of the mounting fittings 22a, 22b. Reference numerals 28a and 28b are holding parts, each of which has a through hole formed in the electrode piece. Reference numeral 33 indicates a disconnecting member attached between both holding parts 28a and 28b. In this disconnecting body 33, 34 is a main body, which is made of a material such as a glass tube that maintains its shape under normal conditions and breaks when a rupture occurs as described below. 35 and 36 indicate terminal fittings attached to both ends of the main body 34. Reference numeral 37 denotes an ignition wire connected between the two terminal fittings 35 and 36, which is made of a filament of a miniature light bulb or a fuse that becomes red hot and melts by a minute electric current. Reference numeral 38 denotes a reactive agent filled in the main body 34, which is a reactive agent such as explosives, silver oxalate, etc., which expands rapidly during reaction (ignition) and obtains a large amount of energy. 39 is main body 3
A protective tube surrounding the protective tube 4 is suitably made of an insulating material such as synthetic resin or porcelain, and has high mechanical strength. 40 indicates a small hole formed in the protective tube 39. 41 is a shorting piece,
The spring 42 is also constantly biased upward. Reference numeral 43 denotes a blocking body, the tip of which comes into contact with the protective tube 39 to prevent the shorting piece 41 from moving upward. Note that this blocking body 43 is made of an insulating material such as synthetic resin. Next, 44 is a display body, which is composed of a foldable tape 45 and a display plate 46 connected to the lower end of the tape 45. These are extremely bright colors (red, red, etc.) so that they can be easily recognized at night or from a distance.
(yellow) reflective tape or reflective coating. A fixed string 47 is attached to the display plate 46 and is hooked to the main body 34 through the small hole 40 and the small hole 48 provided in the shorting piece 41.
For example, a wire or the like is used as the fixing string 47.

In the case of the above structure, if an abnormal high voltage is applied due to lightning or other causes to the high voltage distribution line 5 whose insulation coating has been damaged near the insulator 2 for some reason, the above-mentioned damage to the high voltage distribution line 5 An arc is generated from the damaged part of the coating toward the arm 1 or the insulator metal fitting 2a that is grounded. In this case, since the arcing horn 19 is present between the high-voltage power distribution line 5 and the cross arm 1, electric discharge is started between the damaged part of the coating and the arcing horn 19. The discharge current is arcing horn 19, support piece 2
0, upper terminal 18, auxiliary electrode fitting 15, current limiting element 13, electrode fitting 14, lower terminal 16, mounting fitting 2
2b, electrode piece 27b, ignition line 37 of disconnector 33,
It flows to the ground through the electrode piece 27a, the mounting fitting 22a, the supporting piece 8, the fitting 9, the insulator metal fitting 2a, the cross arm 1, the grounding wire, etc., that is, through the protective grounding circuit. In this case, since the current limiting element 13 has excellent voltage non-linearity, the response to the abnormally high voltage is fast, and the discharge current based on the discharge is discharged in the order of several tens of microseconds. Therefore, even if an arc occurs due to the above-mentioned abnormal high voltage, the current limiting element will only allow the arc current caused by the abnormal high voltage to flow, and will block the superposition of the commercial frequency for the subsequent 50 or 60 cycles. and cut off the following flow.

Therefore, in the above case, due to the presence of the arcing horn 19, the arc does not lick the surface of the high-voltage pin insulator 2, and damage to the high-voltage pin insulator 2 is prevented, and damage to the insulator 2 due to the generation of follow-on current is prevented. Uneven heat damage is also prevented. Further, fusing of the high voltage distribution line 5 due to the occurrence of follow-on current is also prevented.

When the above-mentioned arc current flows, the ignition wire 37 of the disconnector 33 becomes red hot or melts. As a result, the reactant 38 starts to react, rapidly expands (bursts), and damages the main body 34. Due to this damage to the main body 34, the fixed string 47 is cut or loses its hanging object. Therefore, in the normal state, the display body 44, which is in the display body storage portion 26 as shown in FIG. 2, protrudes downward as shown in FIG. 3, and enters the display state. Note that when the reactant 38 reacts and the main body 34 ruptures, the presence of the protective tube 39 causes the main body 34 to burst.
The scattering of fragments is prevented, and the pressure and popping sound caused by bursting is also suppressed.

Moreover, as mentioned above, the ignition wire 37 is fused and the main body 3
3 ruptures, the shorting piece 41 as shown in FIG.
The protective tube 39 is moved upward by the biasing force of the spring 42 through the blocking piece 43, thereby short-circuiting the electrode pieces 27a and 27b. Therefore, even if the above-mentioned abnormal high voltage is applied to the high-voltage distribution line 5 again later, the current-limiting element 13 is operated in the same manner as in the above case, and the insulator 2 can be prevented from being damaged.

As described above, in this invention, when an abnormally high voltage is applied to the charged part fixed to the wire fastening part and an arc is generated therefrom, the existence of the flashing member 19 prevents The arc can be generated at a position away from the insulator 2, which has the effect of preventing damage to the insulator due to the high heat of the arc.

Furthermore, in the event that the above-mentioned arc occurs, the presence of the current-limiting element 13 allows the current to be quickly cut off after the arc current due to the above-mentioned abnormally high voltage flows, and the trace of the arc is quickly extinguished. It also has the effect of preventing damage to item 2.

Furthermore, when such an arc occurs, the display 44 moves to the display position due to the breakage of the disconnector 33 in the display device 21, and there is an effect that the occurrence of the arc can be continuously displayed thereafter.

Moreover, even if the disconnector 33 is broken in the above case, the electrode pieces 27a and 27b can be short-circuited with the short-circuit piece 41, and the abnormal high voltage as mentioned above is applied to the charged part again later. Sometimes,
This has the effect of preventing damage to the insulator 2 as described above.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a partially sectional front view, FIG. 2 is a sectional view of the ground fault accident display device, and FIG. 3 is a second diagram showing the display operating state. FIG. 4 is a cross-sectional view of the disconnector. 1... Bracelet, 2... Insulator, 5... High voltage distribution line,
19... Arching horn, 21... Ground fault accident display device, 27a, 27b... Electrode piece, 33... Disconnector, 41... Short circuit piece, 44... Indicator.

Claims (1)

[Scope of utility model registration request] On the side of the insulator, which has one end fixed to the ground side member and the other end has a wire fastening part, a flashing member connected to the ground side member is provided between the ground side member and the wire fastening part. is arranged so that when an abnormally high voltage is applied to the charged part fixed to the wire fastening part, an arc can be generated between the charged part and the flashing member. In the damage prevention structure, a current limiting element is provided between the flashing member and the grounding member to allow only the arc current caused by the abnormally high voltage to flow and cut off subsequent current, and a current limiting element that allows the arc current to flow due to the abnormally high voltage and interrupts subsequent current. A display device is connected in series to indicate that the current has flowed, and the display device includes an electrode piece connected to one end of the current limiting element and another electrode piece connected to a part of the ground side member. The display device includes electrode pieces and a disconnecting body that electrically connects the electrode pieces to each other and is itself destroyed when energized, and furthermore, the display device performs a display operation by breaking the disconnecting body. 1. A structure for preventing damage to an insulator, comprising: a display body having a structure shown in FIG.