JPH037274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting the position of a lightning strike on an overhead power line.

In conventional technology, generally when an overhead power line is struck by lightning, the lightning current caused by the lightning is detected by a coil, which causes a spark to explode the gunpowder and color the gunpowder. By exposing the exposed cloth, the location of a lightning strike could be visually detected. However, this conventional technique has the disadvantage that it requires a great deal of effort and time to find the location of a lightning strike, and has low workability, since it estimates the location where it is thought to have been struck by lightning and then inspects the spot.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for detecting the location of a lightning strike that can easily detect the location of a lightning strike at a substation or the like without going to the site, thereby improving work efficiency.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an overhead power line 1 such as an overhead ground wire having a lightning position detection device 10 used in the method of the present invention.
2, the lightning position detection device 10 is installed on each steel tower 14.
Lightning strike position detecting means 10A, 10B, 1 are provided at A, 14B, 14C, respectively, and generate lightning strike signals of different patterns for each tower as will be described later.
It consists of 0C... Each lightning detection means is connected to each steel tower 14A, 14 as shown in detail in FIG.
It consists of a lightning current detector 16 for detecting the lightning current flowing through B and 14C, and a bit pattern generator 18 driven by the detection current from the lightning current detector 16. In the illustrated embodiment, the lightning current detector 16 includes a coil and a relay that detect lightning current flowing through the steel towers 14A, 14B, and 14C, and the relay contact 16a is connected to the negative electrode side of the battery power source 20. The bit pattern generator 18 is adapted to generate a different bit pattern for each tower. FIG. 4 shows one bit pattern, and with an 8-bit pattern signal, 256 different pattern signals can be generated. The bit pattern generator 18 is connected to a baud rate oscillator 22 which generates a constant frequency signal. The bit pattern generator 18 and the baud rate oscillator 22 are connected to the positive side of the battery power supply 20. Therefore, the lightning current detector 16
When the lightning current is detected, the relay contact 16a closes and the bit pattern generator 18 generates a lightning strike signal S with a bit pattern corresponding to the tower struck by lightning. The electrical-to-optical converter 24 converts the lightning signal S into an optical signal P, and the electrical-to-optical converter 24 is connected to an optical fiber 26 in or attached to the overhead ground wire containing optical fiber. , the optical signal P is transmitted to the substation through this optical fiber 26.

In the method of the present invention, optical signals indicative of lightning strikes occurring on adjacent steel towers are sent to the optical fiber 26 at different times t as shown in FIG. If the oscillation time of all optical signals is T, then the first period t
Since the optical signals oscillated from both towers do not overlap in the period t and the final period t, the receiving side can reliably determine the location of the lightning strike from the bit pattern of the optical signal P. The delay time t can be easily obtained by a mechanical or electronic timer 28 as shown in FIG. Note that since a microcomputer normally decodes the signal on the receiving side, T may be approximately several seconds to one minute, and t may be several seconds to several tens of seconds.

According to the present invention, as described above, the location of a lightning strike can be detected at a substation or the like without going to the site, so work efficiency can be significantly improved. Even when lightning strikes occur at the same time, the receiving side receives the signals at different times, so there is a practical benefit in that the signals can be reliably identified.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a lightning position detection device used in the present invention, FIG. 2 is an explanatory diagram illustrating the state in which a signal is oscillated by the method of the present invention, and FIG. 3 is a system diagram of one lightning position detection means. FIG. 4 is an explanatory diagram showing an example of one bit pattern of a lightning strike signal. 10...Lightning position detection device, 10A, 10B,
10C... Lightning strike position detection means, 12... Overhead electric wire, 14A, 14B, 14C... Steel tower, 16...
Lightning current detector, 16a... Relay contact, 18...
Bit pattern generator, 24...Electro-optical converter, 26...Optical fiber, 28...Timer, S...
...Lightning current, P...light signal.

Claims (1)

[Claims] 1. When an overhead power line is struck by lightning, different patterns of lightning signals are generated depending on the location of the tower, and the lightning signal is converted into an optical signal and then transmitted through an optical fiber, and a light signal is sent to each adjacent tower to indicate the lightning strike that occurred. A lightning strike position detection method, characterized in that the signals are sent to the optical fiber at different times.