JPS59198366A - Detection of thunderbolt - Google Patents

Abstract

PURPOSE:To achieve an accurate detection of the position of a thunderbolt without any trip to the job site by converting a thunderbolt signal in the pattern varied with steel towers when striken thereby into a light signal to feed light signals from adjacent steel towers into an optical fiber being shifted in time. CONSTITUTION:A lightning current detector 16 is made up of a coil for detecting lightning currents of steel towers 14A-14C and a relay and a bit pattern generator 18 generates a thunderbolt signal S in the bit pattern varied with steel towers. An electro-optic transducer 24 converts the signal S into a light signal P to be transmitted to a substation through an optical fiber 26. Then, light signals indicating thunderbolts separately generated in adjacent steel towers are fed into a fiber 26 being so shifted in the time to prevent duplication. Thus, the thunderbolt position can be determined accurately from the bit pattern of the signal P on the side of receiving signals.

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 such as an overhead ground wire is struck by lightning, the lightning current caused by the lightning strike is detected by a coil, which causes a spark to explode the gunpowder, causing the colored cloth inside the gunpowder to explode. The location of a lightning strike was detected visually by exposing the However, in this conventional technique, the location where lightning is thought to have been struck is estimated and the site is inspected, so it requires a lot of effort and time to find the lightning strike location, and the workability is low.The object of the present invention is to Lightning strike locations can be easily detected at substations, etc. without having to go to the site.

Therefore, it is an object of the present invention to provide a lightning strike position detection method that can improve workability.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a lightning strike position detection device lO used in the method of the present invention.
An overhead 'l-1f line 12 such as an overhead ground wire having a
Lightning strike position detecting means 1 which is provided at each of --- and generates a lightning strike signal of a different pattern for each steel tower as will be described later.
It consists of 0A, 10B, 10C---1. As shown in detail in FIG. 3, each lightning detection means is driven by a lightning current detector 16 that detects the lightning current flowing through each tower 14A, 14B, and 14C, and a detection current from this lightning current detector 16. It consists of a filler I pattern generator 18.

・In the illustrated embodiment, one current detector 16 is connected to the steel tower 1.
It consists of a coil and a relay that detect lightning currents flowing through the terminals 4A, 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 designed to generate a different bit pattern for each tower. Figure 4 shows one hit pattern.

In this way, it is a pattern signal of 8 hits I.

It is possible to generate 256 different patterns>'41''i. The bit pattern generator 18 is connected to a baud rate oscillator 22 that generates a signal with a constant frequency. The bit pattern generator 18 and the baud rate oscillator 2
2 is connected to the positive electrode side of the battery power source 20. Therefore, when the lightning current detector 16 detects a lightning current, the relay contact 16'a closes, and the focus pattern generator 18 generates a lightning strike signal S in a beep pattern corresponding to the tower where the lightning struck. The electrical-optical converter 24 is connected to lightning strike No. 46 S.
This electrical-to-optical converter 24 is connected to an optical fiber 26 in or attached to an overhead ground wire containing optical fibers, and the optical signal P is transmitted through this optical fiber 26 to a power transformer. transmitted to the location.

In the method of the present invention, optical signals indicating lightning strikes that have occurred in 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 during the final period t and the last period t, on the receiving side, from the bit pattern of the optical signal P;
It is possible to reliably judge the J lightning position. The delay time t can be easily obtained by a mechanical or electronic timer 28 as shown in FIG. Note that normally, on the receiving side, a microcomputer decodes the signal, so 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, without going to the site,
The location of lightning strikes can be detected at substations, etc., which significantly improves work efficiency.Also, even if lightning strikes occur simultaneously on adjacent towers where lightning current flows, the receiving side will receive signals at different times. There is a practical benefit in being able to reliably identify the signal as it is received.

[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 hint pattern of a lightning strike signal. 10---Lightning location detection device, IOA. 10B, 10C---One revolution lightning position detection means. 12---1 overhead electric wire, 14A, 14B, 14C---
--One steel tower, 16----Lightning current detector, 16a-
-----Relay contact, 18---111 bit pattern generator, 24---Electrical-to-optical converter, 26------
optical fiber. 28------One timer, 5---Lightning current, p---
--One light signal. / Expansion f32'4 Thickness 3 hardness 64 艷I OI OII O0

Claims (1)

[Claims] When an overhead power line is struck by lightning, different patterns of lightning signals are generated depending on the location of the tower, and after converting the lightning strike number 4a into an optical signal, it is transmitted through optical fiber and indicates the lightning strike that occurred on each adjacent tower. A method for detecting a position of a lightning strike, characterized in that the optical signals sent to the optical fiber are sent to the optical fiber at different times.