JPH05149991A - Detecting method for steel tower in accident - Google Patents

Abstract

PURPOSE:To obtain a detecting method of a steel tower in an accident for positively distinguishing steel tower in an accident by means of a simple and inexpensive device. CONSTITUTION:According to this detecting method of a in an accident, a flashover detecting device 2 with an ultraviolet detecting sensor to detect the ultraviolet rays in a region not included in the spectrum of the sun light is mounted to a steel tower 1 of a power line such as an aerial transmitting/distributing line etc. The flashover detecting device detects a flash of light due to the discharging phenomenon when the flashover accident is given rise to between arcing-horn metals 5a and 5b of an insulator device 4 supporting a wire line 3, and monitors the continuing time of the flash. Only when the continuing time is within 40-600msec, the detecting device makes a judgement that the accident happens.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead transmission line when a flashover accident occurs in the insulator device or in the vicinity thereof due to a lightning strike, bird damage, etc. The present invention relates to a method for detecting an accident tower that is to be identified.

[0002]

2. Description of the Related Art As a conventional method for detecting an accident tower in an overhead power transmission and distribution line,
A resin ball is attached to the tip of the arcing horn metal fitting that is installed facing the ground side and the high voltage side of the insulator device supporting the power line, and this ball is used by utilizing the energy of flashing. There is a method of destroying and identifying which tower has flashed.

However, according to the above-mentioned method, in order to distinguish 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 a power failure is always required. That was a lot of work. Moreover, even if it was attached, the device did not always operate.

As another method, when an overhead ground wire is installed above the power line like an overhead power transmission line, the ground wire current flowing at the time of an accident is detected by CT, and the phase of the accident current is also detected. There is a method to judge whether or not there is an accident at the own tower.

However, in this method, it is necessary to install sensors for detecting the fault current on the overhead ground lines on both sides of one steel tower, and the magnitude of the fault current varies depending on the transmission line. The setting of was complicated. Moreover, there is a problem that it cannot be applied to a line without an overhead ground wire.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and provides a method of detecting an accident tower which can identify the accident tower easily and at low cost. A flashover detection device equipped with an ultraviolet ray detection sensor in a region not included in the spectrum is attached to a steel tower such as an overhead transmission / distribution line, and a flash between the arcing horn metal fittings of the insulator device supporting the power line by the above-mentioned flashover detection device. In addition to detecting the flash of light caused by the discharge phenomenon at the time of the accident, the duration of the flash is monitored and it is judged that the accident has occurred only when it is between 40 msec and 600 msec.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an illustration of a concrete example of the method for detecting an accident steel tower of the present invention. In the drawing, 1 is a steel tower, 2 is a flash detection device, which is installed on the old and young side, for example,
Each of them is installed above the uppermost line of the power line 3 and at a position overlooking the insulator device 4 of the power line 3 so as to face downward. 5a is an arcing horn metal fitting installed on the high pressure side of the insulator device 4, and 5b is a high voltage side arcing horn metal fitting 5a.
Is an arcing horn metal fitting installed on the ground side of the insulator device 4 so as to face the above. Reference numeral 6 denotes a display device that finally judges the detection signal of the flashover detection device 2 and displays whether or not the accident tower is present. However, in this case, each flash detection device 2 may be made to judge whether it is detected and displayed on the spot.

FIG. 2 shows an example of a specific configuration of the flashover detection device 2 used in the detection method of the present invention. FIG.
2B is a view taken along the line XX in FIG. 2A, and FIG. 2C is a vertical sectional view. In the box body 21, an ultraviolet ray detection sensor 22 for detecting ultraviolet rays in a region not included in the spectrum of sunlight, a detection circuit board 23, and a battery 24 as a power source for operating the board 23 are stored. One side of the box body 21 is opened, and an ultraviolet light transmitting glass window 25 is provided in this opening portion, and a light shielding plate 26 is provided inside thereof. Box 21 again
A direction indicator 27, which serves as a guide for determining the direction when the device is installed on a steel tower, and a display lamp 28 are provided on the outer wall of the.

[0009] The ultraviolet rays of the flash due to the discharge phenomenon at the time of a flashover accident between the arcing horn fittings of the insulator device supporting the power line are made incident on the box body 21 through the ultraviolet transmitting glass window 25 of the device 2, and this light beam is The light-shielding plate 26 narrows its input field of view and reaches the ultraviolet ray detection sensor 22. The ultraviolet rays detected there are processed by the detection circuit board 23, and the result is displayed on the display lamp 28. The direction indicator 27 is a guideline for installing the flashover detection device 2 on a steel tower. By adjusting the detection direction in the factory beforehand, the role of shortening and facilitating the on-site installation is played. Fulfill. The direction indicator 27 may be two protrusions as shown in the figure, or a thin tube may be installed.

FIG. 3 is a block diagram of an example of the detection circuit board 24 of FIG. 241 has an ultraviolet detection wavelength band of 160 to 280 nm
242 is a UV detection sensor of 242, which receives a detection signal from the sensor 241, and has a constant time width (40 msec to 600 msec).
) A timer circuit that monitors whether or not to continue. or
243 is an ultraviolet intensity detection sensor that responds to a normal range of ultraviolet rays, compares the intensity of ultraviolet rays detected by the comparator of 244 with a threshold value 245, and if the result is equal to or greater than the threshold value, the result is Output. Then, the outputs of both of them are taken by the AND circuit 246, and it is finally judged whether or not a flashover accident has occurred, and the result is outputted to the display device 6.

FIG. 4 is an explanatory view of an example in which a plurality of flash detection devices 2 detect one insulator device 4 as a target. The case where the flashover detection device 2 is monitored from different angles with respect to the insulator device 4 is shown, and the result of both is further passed through the AND circuit 61 to reduce the probability of malfunction. A display unit 62 receives and displays the result of the AND circuit.

[0012]

As described above, erroneous detection in the following cases can be avoided by setting the detection time width in the flashover detection device and adding a circuit for detecting the intensity of ultraviolet rays. .. Duration intensity (1) Lightning strikes directly to the ground or trees in the vicinity of several hundreds of microseconds (2) Fire, bonfire (far) Long time Weak (2 ') fire, bonfire (near) Long time strong (3) Electric light , Street light (far) Long time weak (3 ') Electric light, street light (nearby) Long time strong (4) Arc welding Long time strong (5) Cosmic ray sporadic- (6) Sunlight not detected (7) Flashover Accident 40-600msec +

That is, the duration of the flashover detection device is 40 msec.
By setting it to 600 msec, (1) and (5) are too short in duration, and (2), (3) and (4) are too long in duration, so they can be distinguished by the timer circuit. Only a flashover accident can be detected. Also, by adding an ultraviolet intensity detection sensor that monitors the intensity of the flash,
Artificial (2) and (3) can be excluded, and even in the case of the same artificial (2 ') and (3'), it is possible to exclude by devising the installation direction of the device, and reliability is improved. Is improved.

Further, in FIG. 2C, the direction of the accident at the steel tower can be determined by setting the viewing angle θ detected by the flashover detection device 2 to ± 20 degrees or less about the optical axis. Becomes

[0015]

As described above, according to the accident tower detection method of the present invention, it is possible to reliably detect an accident tower even in a power transmission and distribution line without an overhead ground line by using a simple and inexpensive device. Will be possible. Therefore, it greatly contributes to the efficiency of patrol of the power transmission and distribution line after the accident and 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 specific configuration example of a flashover detection device in the detection method of the present invention, FIG. 2 (a) is a side view, and FIG. 2 (b) is (a).
FIG. 2 is a vertical cross-sectional view taken along the line XX of FIG.

FIG. 3 is a block diagram of an example of the detection circuit board of FIG.

FIG. 4 is an explanatory diagram of an example of a case in which one insulator device is detected by a plurality of flashover detection devices.

[Explanation of symbols]

 1 Steel Tower 2 Flashover Detection Device 3 Power Line 4 Insulator Device 5a, 5b Arcing Horn Metal Fitting 6 Display Device 21 Box Body 22 Ultraviolet Detection Sensor 23 Detection Circuit Board 24 Battery 25 Ultraviolet Transparent Glass Window 26 Light Shield 27 Direction Indicator 28 Indicator Lamp

Claims (4)

[Claims] 1. A flashover detection device having an ultraviolet ray detection sensor for detecting ultraviolet rays in a region not included in the spectrum of sunlight is attached to a steel tower of a power line such as an overhead transmission line, and the power line is detected by the above flashover detection device. 40 ms by detecting the flash light due to the discharge phenomenon at the time of a flashover accident between the arcing horn fittings of the supporting insulator device and monitoring the duration of the flash light
A method for detecting an accident tower, characterized by determining that an accident has occurred only when it is between ec and 600 msec. 2. The method for detecting an accident tower according to claim 1, wherein the intensity of the flash light is measured in combination with an ordinary photodiode to distinguish it from the flash light from another light source. 3. The accident tower detection according to claim 1, wherein the accident direction at the tower is determined by setting the viewing angle detected by the flashover detection device to ± 20 degrees or less with respect to the optical axis. Method. 4. The method of detecting an accident tower according to claim 1, wherein a plurality of flashover detection devices are used for one detection target and observation is performed from different angles.