JPH05190252A - Arc generation detecting tool - Google Patents

Abstract

PURPOSE:To provide an arc generation detecting tool whereby a trouble part can be easily detected by individually displaying an arc horn of generating an arc discharge. CONSTITUTION:In an arc generation detecting tool, a self combustion type heating agent 4 and insulating incombustible resin 5 of coating this agent are arranged in the inside of a metal-made half-open vessel 2 of applying heat- sensing temperature-showing paint 3 to the periphery, to secure the half-open vessel 2 to an arc horn 1 by bringing it into contact with the insulating incombustible resin 5, and an electrode 6 conducted to the arc horn 1 is arranged to pass through the insulating incombustible resin 5 and to come into contact with the self combustion type heating agent 4. By this arc generation detecting tool, an arc current passes from the arc horn 1 through the self combustion type heating agent 4 to flow in the half-open vessel 2 and to generate an arc discharge. By this current, the self combustion type heating agent 4 generates heat, and the heat is transmitted from the half-open vessel 2 to discolor the heat-sensing temperature-showing paint 3. Even by a constitution of not arranging the self-combustion type heating agent 4, the half-open vessel 2 is heated by the arc current to discolor the heat-sensing temperature-showing paint 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc generation detecting tool for detecting a flashover portion of an arc horn used in an insulator device for a transmission / distribution line.

[0002]

2. Description of the Related Art In recent years, as the demand for electric power has increased, the transmission and distribution system has become larger in scale, while computers and the like have become widespread.
A stable power supply is desired. Since the route of the power transmission line for transmitting the electric power is arranged mainly in the mountain area due to social demands, the lightning stroke failure of the power transmission line and the ground fault due to birds and beasts are likely to occur.

As one of the measures against lightning, an overhead ground wire is stretched over the power line, and arc horns for preventing damage are provided above and below the insulator string supporting the power line. However, if a lightning strike falls on an overhead ground wire or a tower, and a large current flows through the tower, an abnormally high voltage will be generated in the tower, and a lightning surge current will flow into the power line through the arc horn, exceeding the insulator's insulating ability. become. This is the occurrence of so-called reverse flashover. When the power line is directly struck by lightning due to the shielding effect of the overhead ground wire, the potential of the power line rises significantly, and when this potential exceeds the insulation capacity of the insulator series, a flashover occurs and a current flows from the arc horn to the ground through the steel tower to the ground. ..

On the other hand, there is also a line without an overhead ground wire, and when a lightning strike directly occurs on a steel tower or a power line, a reverse flashover or flashover occurs as described above, so that the relay of the substation is activated. It causes a power failure. Also, a bird and beast may approach the vicinity of the insulators and receive an electric shock between the arc horns, resulting in a ground fault and similar power failure.

In order to quickly eliminate such a power outage and secure stable power transmission and distribution, it is necessary to promptly find a ground faulty steel tower, investigate the cause of the failure, and repair it if necessary. is important.

A flashlight indicator is known for easily finding a steel tower in which a reverse flashlight or a flashover has occurred due to a lightning stroke. This indicator induces an induced current from a lightning surge current flowing through a steel tower, ignites a small amount of built-in explosive with a constant induced current generated for each transmission voltage, and uses the gas pressure to release the indicator cloth. To do.

Further, in order to detect a steel tower in which a ground fault has occurred, a pair of attachable current transformers are provided on the left and right centering on the steel tower of the transmission line, and a fault current flows through the steel tower. It is also used that the current shunting to the left and right is detected by a current transformer, a small amount of gunpowder is ignited by using a fault current detection circuit, and the gas pressure is used to discharge and hang a red indicator cloth.

In addition, as a simple method, a method of applying a thermosensitive thermosensitive coating to the tip of the arc horn and discoloring the thermosensitive thermosensitive coating by heat generated by an arc current flowing through the arc horn is adopted.

[0009]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention A flash-on indicator for detecting a lightning surge current of a certain current or more has one tower for one tower.
Although it is sufficient to use a single piece, in the case of a large current, the current also flows into other towers via the overhead ground wire, so that a plurality of flashover indicators may operate. This flashing indicator works only for lightning surge currents, not ground fault currents.

The flash fault indicator for detecting the ground fault current is very complicated because the current from the current transformer is discriminated by the discrimination circuit. In addition, countermeasures such as electromagnetic induction and electrostatic induction were necessary to prevent malfunction due to lightning. These flashover indicators only display for finding a faulty steel tower, but do not display an arc horn or the like where an arc discharge has occurred.

However, the number of arc horns is 3 at least for one steel tower and 24 at many places, and the number of horns is 2 to 4 times that of the arc horn depending on the shape of the arc horn. .. Therefore, even if the faulty tower was found, the worker had to climb the tower and inspect the individual arc horns and insulators to search for the arc horn where the arc discharge occurred.

Although the cause of the fault current due to lightning strike is usually clear from thunder, etc., the arc traces that often appear on the arc horn are often small. However, its discovery is very difficult. Also, since the time from the occurrence of arc discharge to the interruption of the relay is short, the amount of heat that raises the temperature of the arc horn is small despite the occurrence of arc discharge, and the discoloration is small even if the thermosensitive paint is applied. The effect was insufficient.

Therefore, there is a strong demand from the power transmission and distribution industry for an arc generation detection tool that can easily detect a failure location.

The present invention has been made in order to solve such a problem, and provides an arc generation detecting tool capable of individually displaying an arc horn in which an arc current has occurred and easily detecting a failure location. To do.

[0015]

The arc generation detecting tool of the first invention for achieving the above-mentioned object is, as shown in FIGS. 1 and 2 corresponding to the embodiment, a thermosensitive temperature-sensitive coating 3 on the outer periphery.
A self-combustion type exothermic agent 4 and an insulative noncombustible resin 5 covering the same are placed inside a semi-open container 2 made of metal coated with, and the insulative incombustible resin 5 and the arc horn 1 come into contact with each other to be semi-opened. The container 2 is fixed to the arc horn 1, and an electrode 6 that is electrically connected to the arc horn 1 is disposed in contact with the self-combustion type heat generating agent 4 through the insulating noncombustible resin 5.

Similarly, as shown in FIGS. 1 and 3, the arc generation detecting tool of the second invention has an insulating nonflammable resin 5 inside a metal semi-open container 2 having a thermosensitive temperature sensitive coating 3 applied on the outer periphery thereof. Insulating non-combustible resin 5 and arc horn 1
Are in contact with each other and the semi-open container 2 is fixed to the arc horn 1, and the arc horn 1 and the semi-open container 2 are electrically connected by the electrode 6 passing through the insulating noncombustible resin 5.

[0017]

According to the arc generation detecting tool of the first invention, the arc current flows from the arc horn 1 to the semi-open container 2 through the electrode 6, the self-combustion type heat generating agent 4, and the electrode 6, and then the semi-open container 2 is opened. Arc from. Further, the arc current may flow from the semi-open container 2 to the arc horn 1 through the self-combustion type heat generating agent 4 and the electrode 6. The electric current causes the self-combustion type heat generating agent 4 to generate heat, and the heat causes the thermosensitive temperature-sensitive coating material 3 to change color.

According to the arc generation detecting tool of the second invention, the arc current flows from the arc horn 1 through the electrode 6 to the semi-open container 2, and the semi-open container 2 is arc-discharged. The discharge energy at this time heats the semi-open container 2 to discolor the thermosensitive temperature-sensitive paint 3. As before,
Even if the thermosensitive temperature-sensitive coating is directly applied to the arc horn, the arc horn is a steel bar of about 16 mmΦ and has a large heat capacity, so the temperature does not rise sufficiently and the thermosensitive temperature-sensitive coating does not color. However, when the thermosensitive temperature-sensitive coating material is directly applied to the semi-open container 2 as in the present invention, since the heat capacity is small, the heat-sensitive temperature-sensitive coating material is colored sufficiently even with a slight arc current.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an arc generation detecting tool to which the present invention is applied will be described below in detail with reference to the drawings. An external side view of an embodiment of the arc generation detection tool of the present invention is as shown in FIG. 1, and is common to both the embodiment of the arc generation detection tool of the first invention and the embodiment of the arc generation detection tool of the second invention. is there. However, the sectional view is different. FIG. 2 shows an AA sectional view of an embodiment of the arc generation detecting tool of the first invention. FIG. 3 is a sectional view taken along the line AA of an embodiment of the arc generation detecting tool of the second invention. As shown in these figures, the arc generation detecting tool is attached to the arc horn 1. As shown in FIG. 6, the arc horn 1 is attached to a support 10 such as a beam of a steel tower with a mounting bracket 11, and supports an insulator string 12 which is also mounted with the mounting bracket 11. The arc horn 13 paired with the arc horn 1 is fixed to a lower mounting bracket 15 of the insulator string 12 to which a power line 14 is mounted. The arc horn has various shapes other than the shape shown.

As shown in FIGS. 1 and 2, in the arc generation detecting tool of the first invention, the self-combustion type exothermic agent 4 and the insulative noncombustible resin 5 are arranged inside the semi-open container 2. .. The insulating nonflammable resin 5 and the arc horn 1 contact each other, so that the semi-open container 2 is fixed to the arc horn 1 by the insulating fixture 7. The semi-open container 2 is made of metal, and the thermosensitive temperature-sensitive coating material 3 is applied to the outer periphery thereof. An electrode 6 that is electrically connected to the arc horn 1 is disposed in contact with the self-combustion type heat generating agent 4 through the insulating noncombustible resin 5.

The semi-open container 2 is deformable according to the shape of the arc horn 1. For example, a flexible tube made of copper, iron or stainless steel is cut in half. The self-combustion type heat generating agent 4 is preferably a mixture of metal powder and metal oxide so that electricity can be easily conducted. Examples of metal powders that can be used include aluminum, magnesium and iron-iron. Examples of usable metal oxides include iron oxide,
There are lead oxide and copper oxide. The electrode 6 is the arc horn 1,
It electrically connects to the self-combustion type heat generating agent 4, and for example, a wire or plate of copper, stainless steel or the like can be used. The insulating non-combustible resin 5 has good weather resistance and is flexible so that the flexible tube forming the semi-open container 2 can be bent along with the arc horn 1, and for example, a silicone resin is suitable. In addition to this, for example, fluororubber, neoprene rubber or the like can be used. Since the heat-sensitive thermosensitive coating 3 applied to the semi-open container 2 has a considerably high reaction heat of the self-combustion type exothermic agent 4, and the semi-open container 2 has a temperature of 600 ° C. or higher,
Since most of the heat-sensitive temperature-sensitive coating materials 3 change color, there is no need to limit the heat-sensitive temperature. However, since it is exposed to the natural environment for a long time, it is preferable that it has excellent weather resistance such as a fluorine-based paint, and the baking coating used in automobiles can also be used. For example, Bellflon (produced by NOF Corporation)
Is a thermosensitive temperature indicating material that satisfies such performance.

In the arc generation detecting tool of the second invention, as shown in FIGS. 1 and 3, an insulative incombustible resin 5 is arranged inside the semi-open container 2. The insulating nonflammable resin 5 and the arc horn 1 contact each other, so that the semi-open container 2 is fixed to the arc horn 1 by the insulating fixture 7. The semi-open container 2 has a thermosensitive temperature-sensitive paint 3 applied to the outer periphery. The electrode 6 contacting the arc horn 1 is electrically connected to the semi-open container 2 through the insulating noncombustible resin 5.

In the arc generation detecting tool of the second invention, the semi-open container 2 may be a flexible tube made of metal such as copper, iron, stainless steel, etc., which is halved as in the first invention. It is necessary to raise the temperature only by the electric current, and the wall thickness is reduced to about 0.3 mm in order to reduce the heat capacity. By reducing the wall thickness in this way,
The semi-open container 2 will be heated in a wide range. The electrode 6 and the insulating non-combustible resin 5 may be the same as those used in the arc generation detecting tool of the first invention.

FIG. 4 shows another embodiment in which the arc generation detecting tool of the present invention shown in FIG. 1 is attached to the arc horn 1. The arc generation detecting tool is semi-opened at the tip side of the arc horn 1. A hemispherical cap 8 is covered so as to cover the end of the container 2 to fix one of the arc generation detecting tools, and the other is fixed with an insulating fixing tool 7 made of a flexible binding band (insulation tie). FIG. 5 also shows another embodiment, in which the insulating fixture 7 is a turnover type fixture. These are preferably insulating plastics such as rubber and vinyl chloride. When using metal fixtures, use them with an insulator such as rubber or vinyl chloride sandwiched between them. By using such a simple fixture, even when power is being transmitted to the power line 14 (see FIG. 6), a hot wire rod (bakelite long rod that handles a tool attached to the tip by hand operation) The arc generation detecting tool can be attached to and detached from the arc horn 1.

A performance test of the above-mentioned arc generation detecting tool was conducted with the simulated lightning impulse generator shown in FIG. This electric circuit includes a capacitor 21 by a DC high voltage power generator 20.
To the arc horn 1, the high voltage charged in the capacitor 21 is applied to the arc horn 1,
It generates an arc current. The waveform level of the arc current can be adjusted by the adjusting resistor 23. Shunt resistor 2
The current flowing through 4 is recorded on an oscillograph (not shown). The adjusting resistor 23 was adjusted so that the time required to reach the maximum current was 10 microseconds.

The arc horn 1 in this circuit was fitted with an arc generation detecting tool having the specifications of Examples 1 to 3 in Table 1 and the circuit current was changed to observe the color change of the thermosensitive temperature-sensitive paint 3.
The test results are also shown in Table 1. Comparative Example 1
As a test, the same test was conducted on the arc horn 1 which was directly coated with the thermosensitive temperature-sensitive coating material without attaching the arc generation detecting tool.

[0027]

[Table 1]

* As for the shape of the container, flexible tubes of each material are used in half ** Use of the naked eye was confirmed at a distance of 10 m. *** It was possible to distinguish with the naked eye at a distance of 7 m. [Fig. 3] shows a state of a mounting test of the arc generation detecting tool of the present invention. An arc generation detecting tool is mounted on the arc horn 1 (see FIG. 6) attached to a support 10 such as a beam of a steel tower, and a wire 16 is fixed to the arc horn 13 which forms a pair with the arc horn 1. By changing the length of the wire 16 variously, the distance from the tip of the wire 16 to the arc horn 1 (discharge gap length L) is changed, and the voltage of the power line 14 is raised for each discharge gap length to cause arc discharge. Let At this time, the arc discharge current and the arc discharge time were examined, and the color change of the thermosensitive temperature-sensitive coating material 3 was observed. Table 2
Shows the specifications of the arc detection tool used, the test conditions and the test results. As Comparative Example 2, the same test was performed on the arc horn 1 directly attached with the thermosensitive temperature-sensitive coating material without attaching the arc generation detecting tool.

[0029]

[Table 2]

* As for the shape of the container, the flexible tube of each material is halved and used ** It was confirmed with the naked eye whether or not it could be identified at a distance of 10 m.

[0031]

As described in detail above, in the arc generation detecting tool of the present invention, the heat-sensitive temperature-sensitive coating material applied to the surface of the arc-discoloring material is clearly discolored by a slight failure current due to arc discharge. Therefore, it is possible to easily and surely find a failure location even from a distance. In addition, it is possible to operate even with a ground fault current due to birds and beasts, which has been very difficult to detect in the past. Further, since the structure is simple and the attachment / detachment is easy, the maintenance becomes easy.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of an arc generation detecting tool to which the present invention is applied.

FIG. 2 is a sectional view of an arc generation detecting tool to which the first invention is applied.

FIG. 3 is a sectional view of an arc generation detection tool to which the second invention is applied.

FIG. 4 is a view showing another embodiment in which the arc generation detecting tool is attached to the arc horn.

FIG. 5 is a view showing another embodiment in which the arc generation detecting tool is attached to the arc horn.

FIG. 6 is an overall view of a usage state of the arc generation detection tool.

FIG. 7 is a circuit diagram showing a simulated lightning generator for testing an arc generation detector.

FIG. 8 is a diagram showing a state for performing a mounting test of the arc generation detection tool.

[Explanation of symbols]

1 is an arc horn, 2 is a semi-open container, 3 is a thermosensitive temperature sensitive paint, 4 is a self-combustion type exothermic agent, 5 is an insulating non-combustible resin, 6 is an electrode, 7 is an insulating fixture, 8 is a hemispherical cap 10,
Is a support, 11 and 15 are mounting brackets, 12 is an insulator string, 14
Is a power line, 20 is a DC high-voltage power generator, 21 is a capacitor, 22 is a switch, 23 is an adjusting resistor, and 24 is a shunt resistor.

Claims (2)

[Claims] 1. A self-combustion type exothermic agent and an insulative noncombustible resin which covers the self-combustion exothermic agent inside a semi-open container made of metal, the outer periphery of which is coated with a thermosensitive temperature-sensitive coating. Arc generation characterized in that the semi-open container is fixed to the arc horn by contact with the horn, and the electrode conducting to the arc horn is in contact with the self-combustion type heat generating agent through the insulating noncombustible resin. Detection tool. 2. An insulative non-combustible resin is placed inside a semi-open container made of metal, the outer periphery of which is coated with a thermosensitive temperature-sensitive paint.
The insulating incombustible resin and the arc horn are in contact with each other, and the semi-open container is fixed to the arc horn, and the arc horn and the semi-open container are electrically connected by an electrode passing through the insulating non-combustible resin. The arc generation detection tool.