JPH045579A - Heating device for detecting abnormality generation point - Google Patents

Abstract

PURPOSE:To specify an abnormal point by the heating device which is light in weight and small in size and power source capacity by providing a heat generation part generating heat by mixing two kinds of material partitioned with a film in each section of an optical fiber incorporated overhead earth-wire(DPGW), and detecting the temperature of each part of the DPGW by the intervention of Raman scattered light. CONSTITUTION:A temperature specifying device(DTS) 3 which detects the Raman scattered light of incident light from one end of the DPGW1 specifies the temperature of each section of the DPGW1 which is sectioned by steel towers 2a - 2d. In each section, the heat generation part 42 which generates heat by mixing two kinds of materials 422 and 423 covered with a heat- insulating coating material 424 by fusing the partition film 42 through a switch 47 controlled through a current detecting circuit 45 is provided, and the DTS3 detects the temperature rise of the DPGW1 in an abnormal section of lightning, etc., so that the abnormal point can be specified by the lightweight, small-sized heating device which has small power source capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heating device for detecting an abnormality point, which is used for detecting an abnormality point such as a lightning strike or ground fault on an overhead power transmission line.

(Conventional technology and problems to be solved) As one of the conventional abnormality point detection techniques, an existing 0TDR (optical fiber fault detection device) is used to detect changes in transmission loss of an optical fiber at an abnormal point. There is something I tried to find out.

The above method detects Lehley scattered light in an optical fiber,
Since the optical transmission loss of each part of the optical fiber is detected, when applied to abnormal point detection, it is necessary to take measures to change the transmission loss of the optical fiber.

The main means of changing the transmission loss of an optical fiber is to apply mechanical stress to the optical fiber.
In addition, there are some methods that change the light transmission state by changing the material of the optical fiber. However, in either case, it was necessary to give some kind of direct effect to the optical fiber itself. Therefore, for example, OPG of overhead power transmission line! In the case of (optical fiber composite overhead ground wire), it is necessary to cut the 0PGW and take out the optical fiber outside, which takes a lot of time and effort to install, and opa which does not require cutting.
There are disadvantages such as an adverse effect such as an increase in transmission loss on other optical fibers in the W.

A new abnormality point detection method that solves these problems was previously proposed by the inventors of the present invention. This method does not detect Raman scattered light as described above, but uses a device (DTS) that detects Raman scattered light to determine the temperature of each part of the optical fiber, and detects the current flowing when an abnormality occurs.
Based on this, the temperature change is forcibly applied to the optical fiber near the point where the abnormality has occurred to detect the point where the abnormality has occurred.

In this type of detection method, the object of measurement is the temperature of the optical fiber, so in order to forcefully change it, it is not necessary to directly change the optical fiber as in the past, and it is necessary to use the OPCW. In this case, there is no need to cut the optical fiber and take out the optical fiber from inside, and there is an advantage that detection can be performed simply by applying a temperature change to the opaw from the outside.

FIG. 1 is an explanatory diagram of an example in which the above-described detection method is used to detect a lightning strike point on an overhead power transmission line.

In the drawing, (1) is the 0PGW installed at the top of the tower (2) of the overhead power transmission line, and the OPG! 1 (1
) has DTS (
3) is connected to measure the spatially continuous temperature distribution of 0PGW (1).

Now, if there is a lightning strike (A) between the steel towers (2C) and (2d), the lightning current (B) will be 0 from the lightning strike point as shown in the figure.
It flows in both directions of the PGW, and the steel tower closest to the lightning strike point (2c
H2d) flows to the earth. So, OPG! ! (1)
If you install heating devices (4) at multiple locations in the optical fiber and set it to heat the 0PGW (1) at that location when a lightning current is detected, the DTS (3) will The temperature at the corresponding point in the temperature distribution changes, making it possible to identify the lightning strike point.

(Means for Solving the Problems) The present invention uses the novel abnormality point detection method described above to detect the current flowing when an abnormality occurs, and forcibly change the optical fiber near the abnormality point based on this. The heating device is equipped with a current detection part that detects the current flowing when an abnormality occurs and a heating part attached to the 0PGW. The structure is divided by a built-in membrane, and the outside is covered with a heat-insulating coating.

(Example) FIG. 2 is an explanatory diagram of the state in which the heating device of the present invention is used.

Further, FIG. 3(a) is a cross-sectional view of the heating section, and FIG. 3(b) is a plan view of the heating wire built-in membrane.

The current detection section (41) is OPG! It consists of a CT with a winding (44) whose core is a ferrite (43) surrounding (1), and a current detection circuit (45) that analyzes the current detected in the zero-light and detects lightning surge current.

On the other hand, the heating part (42) separates two substances (422L (42, 3), for example, quenched coal and water that generate heat by mixing them, with a membrane (421) containing a heating wire (425), and the outside is covered with a heat insulating coating. It has a structure covered with material (424) and has 0P
Attach it on the outer circumference of GW (1).

When a lightning surge current is detected by the current detection unit (41), the switch (47) is closed and the heating wire (425) is heated by the current from the power source (46), melting the membrane (421). - Once a part of the film (421) is melted, the heat generated by the mixing of the two types of substances (422) and (423) will further progress the melting of the film (421), increasing the amount of heat generated and reducing 0PGW. heated.

(Effects of the Invention) As explained above, according to the heating device of the present invention, once a part of the film is melted by the heating wire, the film continues to melt due to the heat generated by mixing the two types of substances. It becomes possible to minimize the capacity of the power supply, and the entire heating device can be made lighter and smaller, which is extremely effective when used attached to 0PGW etc.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a newly proposed method for detecting lightning strike points on overhead power transmission lines. Figure 2 is an explanatory diagram 4 and 3 of the usage state of the heating device of the present invention.
Figure (a) is a cross-sectional view of the heating section, and the same figure (1 is a plan view of the heating wire built-in membrane. 1...0PGW14...heating device, 41...current detection unit, 42... Heating section, 421... Membrane, 422.
423...Two types of substances that generate heat when mixed, 424.
... Heat insulation coating material, 425 ... Heating wire, 43 ... Ferrite core, 44 ... Winding wire, 45 ... Current detection circuit, 46 ... Power supply, 47 ... Switch.

Claims (1)

[Claims] (1) Applying a device that injects light into the optical fiber from one end of the optical fiber and detects the Raman scattered light to determine the temperature of each part of the optical fiber, the abnormality occurrence point of the OPGW (overhead ground wire with built-in optical fiber) A heating device that detects the current that flows when an abnormality occurs and forcibly changes the temperature of the optical fiber near the point where the abnormality occurs based on the detected current, and the heating device detects the current that flows when an abnormality occurs. The heating part has a structure in which two types of substances that generate heat when mixed are separated by a membrane containing a heating wire, and the outside is covered with a heat insulating coating. A heating device for detecting the point of abnormality occurrence.