JPH0572250A - Detection of fault iron tower - Google Patents

Abstract

PURPOSE:To certainly detect a fault even in a distributing line having no overhead earth wire using a simple and inexpensive device by downwardly providing ultraviolet detectors at a plurality of places on the upper side of the uppermost circuit of a steel tower of a power line such as an overhead transmission distribution line. CONSTITUTION:In an ultraviolet detector 2, three ultraviolet detection sensors 22 are arranged in a downwardly opened shading container 21 shielding sun's rays so as to be separated by shading screens 23. The shading container 21 has a cylindrical or conical shape. A shading plate 26 having a pinhole 25 is provided to the open end of the shading container 21 and the distances between the pinhole 25 and the respective sensors 22 are preset. The result taking the AND of output with respect to the detection signal of ultraviolet rays detected by each of the ultraviolet detection sensors 22 in a detection circuit 24 is displayed on a display device as the final output. The ultraviolet detector 2 is arranged to a steel tower 1 and the ultraviolet rays of the region not contained in the spectrum of sun's rays at the time of a flash fault are detected to discriminate a faulty steel tower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when a flashover accident occurs in an insulator device or in the vicinity thereof due to a lightning strike or bird damage in an overhead power transmission / distribution line, the flashover is detected to identify the accident tower. The present invention relates to a method of detecting an accidental steel tower.

[0002]

2. Description of the Related Art As one of the conventional methods for detecting an accident tower in an overhead power transmission and distribution line, an arcing horn installed facing the earth side and the high voltage side of an insulator device. There is a method in which a resin ball is attached to the tip of the metal fitting and the arc energy at the time of flashing is used to destroy the ball to identify in which tower the flashing has occurred.

However, according to the above-mentioned method, in order to identify whether one tower is an accident tower or not, it is necessary to attach the device to the arcing horn fittings of all the insulator devices, and it is necessary to attach all the installed devices. Not all devices worked.

As another method, when an overhead ground wire is installed above the tower like an overhead power transmission line, the accident tower is identified based on the accident current flowing through the overhead ground wire at the time of an accident. There is a way.

However, according to this method, it is necessary to install sensors for detecting fault currents on the overhead ground lines on both sides of one steel tower, and a circuit for detecting the phase difference between them is required. The magnitude of the current was different, and the method of setting the threshold value of the fault current was complicated. Moreover, there is a problem that it cannot be applied to a distribution line without an overhead ground wire.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a method for detecting an accident tower which can identify the accident tower easily and at low cost, which is characterized by an overhead transmission line and the like. At several points above the top line of the power tower of the power line, the ultraviolet detectors are installed downward, and the ultraviolet rays in the light emission due to the discharge phenomenon at the time of a flashover accident are not included in the spectrum of sunlight. It is to identify the accident tower by detecting.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a concrete example of a method for detecting an accident steel tower according to the present invention. In the drawings, 1 is a steel tower, 2 is an ultraviolet detector, and shows an example in which the devices 2 are installed on the old side and the young side of the steel tower 1, respectively, above the uppermost line of the power line 3 and on the power line 3 respectively. The insulator device 4 is installed downward so as to look down. Reference numeral 6 is a display device that finally judges the detection signal of the ultraviolet ray detection device 2 and displays whether or not the accident is a tower. Reference numeral 5 is a horn gap formed in the insulator device 4.

FIG. 2 is a block diagram of a specific example of the ultraviolet ray detector 2. Light-blocking container 21 that opens at the bottom to block sunlight
Inside, the three ultraviolet detection sensors 22 are installed with a partition 23 for light shielding between the sensors interposed therebetween. The light-shielding container 21 has a cylindrical shape or a conical shape. As a means for guiding the discharge light due to the discharge phenomenon between the horn gaps 5 of the insulator device 4 to the ultraviolet ray detection sensor 22 in the light shielding container 21, a light shielding plate 26 provided with a pinhole 25 on the open end side of the light shielding container 21. And, if necessary, glass, resin, etc. 27 having the property of attenuating ultraviolet rays is provided in front of the pinhole. And the viewing angle α of the pinhole 25 and each sensor 22
This pinhole covers the detection range covered by this device.
The distance between the pinhole 25 and the sensor 22 is set so as to be equal to or slightly larger than the viewing angle when viewed from above. Then, the detection circuit 24 displays the result obtained by ANDing the detection signals of the ultraviolet rays detected by the respective ultraviolet ray detection sensors 22 on the display device 6 as the final output. FIG. 3 is a block diagram of the ultraviolet detection device 2.

[0009]

As described above, by installing the ultraviolet ray detector 2 on the old side and the young side of the steel tower 1, it is possible to cover all the insulator devices 4 of the steel tower, and many detectors are required. Not.

Further, the ultraviolet ray detecting device 2 adopts a system in which a plurality of ultraviolet ray detecting sensors 22 installed in the light shielding container 21 confirm the discharge phenomenon only after receiving the ultraviolet ray from the same discharge phenomenon. If the sensor 22 is a side-on type UV detection sensor that utilizes the photoelectric effect and gas doubling effect of metal, even if the sensor receives neutron rays from the universe and operates, it simultaneously acts on multiple sensors. The probability of hitting is very small in probability, and the occurrence of malfunction can be prevented. The light-shielding partition 23 placed between the ultraviolet detection sensors 22 has a characteristic that when one sensor operates by receiving a neutron beam from the universe, it emits ultraviolet light again, so that adjacent sensors Does not work.

By operating the ultraviolet ray detection sensor with the ultraviolet rays that have passed through the pinhole 25, malfunctions due to lightning strikes that occur near the power transmission and distribution line or in another steel tower are prevented, and the pinhole and the sensor are also used. The monitoring area can be made as narrow as possible by adjusting the distance. Further, by setting glass or resin for attenuating ultraviolet rays on the front surface of the pinhole, the intensity of the ultraviolet rays to be detected is set, and for example, the detection wavelength range generated when the lighter is ignited to light a cigarette is set. It can be set so as not to malfunction even with ultraviolet rays.

[0012]

As described above, according to the accident tower detection method of the present invention, the accident tower can be reliably detected even in a distribution line or the like having no overhead ground wire by using a simple and inexpensive device. be able to. Therefore, it greatly contributes to the efficiency of patrol of the power transmission and distribution line after the accident, and to the improvement of the reliability of power supply.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a specific example of a method for detecting an accident steel tower according to the present invention.

FIG. 2 is a configuration diagram of a specific example of an ultraviolet ray detection device.

FIG. 3 is a block diagram of the ultraviolet ray detection device of FIG.

[Explanation of symbols]

 1 Steel Tower 2 Ultraviolet Detector 21 Light-Shielding Container 22 Ultraviolet-Detecting Sensor 23 Light-Shielding Partition 24 Detection Circuit 25 Pinhole 26 Light-Shielding Plate 27 UV-Attenuating Material 3 Power Line 4 Insulator Device 5 Horn Gap 6 Display Device

Claims (2)

[Claims] 1. An ultraviolet detecting device is installed downward at a plurality of positions above the uppermost line of a steel tower of an electric power line such as an overhead transmission and distribution line, and the ultraviolet rays are emitted at the time of light emission due to a discharge phenomenon during a flashover accident. A method for detecting an accident tower, which comprises identifying the accident tower by detecting ultraviolet rays in a region not included in the spectrum of sunlight. 2. The method for detecting an accident steel tower according to claim 1, wherein the ultraviolet ray detecting device comprises a shielding means for shielding light emission at a place other than the steel tower where the ultraviolet ray detecting device is installed.