JPS622516Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a device that detects abnormalities in advance at points where accidents are expected, especially for maintenance of power supply lines of transmitting antennas for TV broadcasting. It relates to a device that utilizes the principle that can be converted into

Using a thermocouple, one end is attached to the outside of the power supply line (connection point) where an accident is expected to occur, and the other end is attached to the outside of the power supply line (normal point) where an accident will not occur. One possible method is to detect the temperature rise caused by heat generation at the connection point on the surface of the power supply line as a precursor to the occurrence of an accident, thereby knowing in advance that an accident will occur.

This method consists in attaching thermocouple contacts to a connection point where an accident is expected and a normal point where an accident does not occur, and both contacts are located at separate locations. For this reason, differences in the degree of wetness due to rain, cooling due to wind, degree of sunlight, etc. are expected between the two contacts due to the surrounding conditions, and the external surface of the power feeder is subject to different thermal influences, causing the internal temperature that should be detected to be low. Accurate detection is difficult with devices that use thermocouples that detect from the outside of the wire.

In this invention, by attaching a cover to shield both the thermocouple contacts at the connection point and the normal point from peripheral conditions (rain, wind, sunlight, etc.) that have different thermal effects on the thermocouple contacts. This paper proposes a device that eliminates thermal effects caused by peripheral conditions and accurately detects abnormal temperatures.

As a specific example, as shown in Fig. 1, covers 5 and 5' of the same shape are installed in the same manner on the contact 3 attached near the connection part 2 of the feeder line 1 of the contact 1 and the contact 4 of the normal part. , shielding from the influence of surrounding conditions.
In this case, the shape of the cover must be such that it prevents rainwater from entering from the top, and the sides must cover the surrounding area to shield wind and sunlight. Since there are almost no reflections (except for reflections of If light is reflected from below, etc., this can be easily solved by providing a separate shielding plate.

FIGS. 2 and 3 are shown as representative examples of the structure of the cover.

In the figure, 6 is a power supply line, 7 is a cover body made of metal or synthetic resin, 8 is a fastening fitting, 9 is a packing rubber, and 10 is a sealing material.

The cover main body may be formed of a split molded product or a plate-shaped material wrapped around it, and the cross-sectional shape may be a cylinder to a polygonal tube.

The above-described device of the present invention connects a thermocouple to the surface of the normal part in the vicinity of the place where an abnormality is expected and compares the temperature. In addition, each contact mounting part is equipped with a cover to prevent sunlight, wind and rain, so there is no apparent temperature difference caused by partial shade or rainwater. It is possible to achieve the effect of being able to prevent.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the device of the present invention, Figures 2 and 3
The figure shows an embodiment of the cover used in the device of the invention. In the figure, 1 and 6 are power supply lines, 2 is the power supply line connection part, 3 is one contact of the thermocouple attached to the power supply line near the connection part, and 4 is installed on the normal part of the power supply line a little away from 3. The other contact point of the thermocouple, 11, indicates a temperature difference detection device of the thermocouple.

Claims (1)

[Scope of utility model registration request] In a device that detects temperature abnormalities at parts where temperature rise abnormalities are expected, such as connections of coaxial power lines, thermocouples attached to the surface of the feeder line near the parts where temperature rise abnormalities are expected, such as connection parts, are used. one contact, the other contact of the thermocouple attached to the surface of the normal part of the feeder line a little away from the above point, a device that detects the temperature difference between both contacts, and a device that detects the temperature difference between the two contacts, An antenna feed line temperature abnormality detection device comprising a metal or synthetic resin cover provided to prevent rainwater and sunlight from hitting the antenna.