JP3067922B2 - Soil detection sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a fouling detection sensor used for grasping a fouling amount of an insulator device for insulatingly supporting an overhead transmission line.

[0002]

2. Description of the Related Art If the surface of an insulator device is contaminated by attached salt, the insulating property is reduced. Therefore, it is necessary to keep track of the amount of contamination of the insulator device for maintenance of an overhead transmission line. Therefore, a fouling detection sensor installed near the insulator device has been conventionally known.

[0003] A typical example of this type of fouling detection sensor is, as shown in Japanese Utility Model Application Laid-Open No. Sho 62-88951, an insulating sensor based on the interelectrode resistance of a comb-shaped electrode disposed on an insulating plate. This method detects the amount of equivalent salt deposited on the plate. During measurement, the insulating plate is cooled by an electronic cooling device to cause dew condensation, and the leak current is measured even when the electrodes are wet. .

However, this type of conventional fouling detection sensor is
Since it is necessary to wet the entire comb-shaped electrode widely distributed on the insulating plate, it is inevitable that a part of the comb-shaped electrode will be excessively wet, and the leakage current between the electrodes will change. Measurement accuracy tended to decrease. In order to avoid this, if wetting is suppressed, insufficient wetting occurs partially, and the measurement ends before the leakage current between the electrodes reaches saturation, which also tends to lower the measurement accuracy.

Therefore, the present inventor arranged a large number of independent electrodes in a matrix on an insulating plate, applied a voltage to each independent electrode sequentially, detected a leakage current between the electrodes, and performed this operation entirely. We are developing a fouling detection sensor that calculates the equivalent amount of salt deposition from the distribution of the resistance on the entire insulating plate after performing between the electrodes. The contamination detection sensor of this type obtains the resistance value distribution based on the local leakage current, so that there is an advantage that the measurement can be performed with high accuracy without being affected by the variation in the wet state of the insulating plate as in the related art.

However, when such an independent electrode is used, it is necessary to lead the lead wire 22 of each electrode 21 through the insulating plate 23 as shown in FIG. And insulating plate 23
Since a metal plate 24 of the electronic cooling device is attached to the lower side, a through hole 25 is formed in this metal plate 24 so that the lead wire 22 is formed.
I was pulling out.

However, in the electrode structure shown in FIG.
The contact area between the metal plate 24 and the insulating plate 23 is reduced by the area of 25, and the area where the lead wires 22 and the metal plate 24 come into contact with the outside air is increased so that the cooling efficiency is reduced.
However, it is not easy to form a large number of through-holes 25 and draw out the lead wires 22.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and can accurately detect contamination using independent electrodes widely distributed over the insulating plate. The present invention has been completed in order to provide a contamination detection sensor which has a high cooling efficiency when wetting an insulating plate and can easily draw out a large number of lead wires.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a fouling detection sensor for detecting the amount of equivalent salt deposited on an insulating plate based on the resistance between electrodes on the insulating plate. The insulating plate has a double structure, and lead wires from a number of independent electrodes formed on the surface of the upper insulating plate are drawn out to the side with the lower insulating plate interposed therebetween. It is characterized by being directly attached to a cooling device.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the illustrated embodiments. FIG. 1 is a plan view showing a main part of a fouling detection sensor according to the present invention, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a sectional view showing an enlarged single independent electrode. As clearly shown in FIGS. 2 and 3, in the present invention, the insulating plate has a double structure of an upper insulating plate 1 and a lower insulating plate 2. These insulating plates 1 and 2 are made of a ceramic plate.
The independent electrode 3 is formed on the surface of the. Lead wires 4 from the respective independent electrodes 3 are passed through the upper insulating plate 1 and are drawn out from between the upper insulating plate 1 and the lower insulating plate 2 to the side.

As shown in FIGS. 1 and 2, the lower insulating plate 2
Is formed in a size larger than the upper insulating plate 1,
It is supported by a frame 6 so as to rest on the printed circuit board 5. A thermo module (Peltier element) 7 of the electronic cooling device is provided inside the frame 6, and the thermo module 7 is directly attached to the lower surface of the lower insulating plate 2 by silicon grease 8. Reference numeral 9 denotes a heat radiating plate of the electronic cooling device, in which a large number of fins are formed to enhance a heat radiating effect. As shown in FIG. 2, the area of the heat radiating plate 9 is preferably set to be two to four times as large as that of the thermo module 7 in order to enhance the heat radiating effect.

Reference numeral 10 denotes a fixing jig, the periphery of which is molded on a base 12 by a rubber mold 11,
The inside of the device is protected from the outside. For this reason, there is no possibility that a problem occurs in the weather resistance of the lead wire 4.

[0013]

The fouling detection sensor of the present invention thus configured is installed near the insulator apparatus so as to receive the same fouling as the flaw insulator apparatus. The plate 1 is moistened. At this time, since the thermo module 7 of the electronic cooling device is directly attached to the lower surface of the lower insulating plate 2 and both are closely adhered to each other, an excellent cooling effect can be obtained. Therefore, the insulating plate 1 can be moistened at a high speed. Then, the electrodes 3 may be sequentially selected by a switch circuit (not shown), and a leakage current may be measured even when a voltage is applied. When the measurement is completed for all the electrodes 3 by repeating this operation, the arithmetic unit calculates the resistance value distribution over the entire surface of the insulating plate 1 and calculates the equivalent amount of the attached salt on the insulating plate 1.

Further, in the present invention, the lead wire 4 of each electrode 3 is drawn out from the space between the two insulating plates 1 and 2 as shown in FIG. 4
Can be easily pulled out and its weather resistance can be enhanced.

[0015]

As described above, in the fouling detection sensor of the present invention, a large number of independent electrodes 3 are arranged in a matrix on the insulating plate 1, and a voltage is sequentially applied to each of the independent electrodes 3 to interpose these electrodes. Since a method of detecting leakage current is employed, accurate measurement can be performed without being affected by variations in a wet state. Further, in the present invention, since the thermo module 7 of the electronic cooling device is directly attached to the entire lower surface of the lower insulating plate 2, an excellent cooling effect can be obtained, and high-speed wetting is possible. Further, according to the present invention, the lead wire can be easily pulled out and its weather resistance can be improved. Therefore, the present invention greatly contributes to industrial development as a fouling detection sensor that solves the conventional problems.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 3 is an enlarged sectional view of an electrode portion.

FIG. 4 is an enlarged sectional view of an electrode portion according to the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper insulating plate 2 Lower insulating plate 3 Independent electrode 4 Lead wire 7 Thermo module of electronic cooling device

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Nagae Nagae 3-150 Omoyama, Tenpaku-ku, Nagoya City, Aichi Prefecture (56) References JP-A-62-3669 (JP, A) (JP, U) Japanese Utility Model Showa 62-88951 (JP, U) Japanese Utility Model Showa 62-88952 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 27/00-27 / 10 H01B 17/00-17/54 H02G 1/02

Claims (1)

(57) [Claims] In a fouling detection sensor for detecting an equivalent salt deposition amount on an insulating plate based on a resistance value between electrodes on the insulating plate, the insulating plate has a double structure and is formed on a surface of an upper insulating plate. A fouling detection sensor characterized in that lead wires from a large number of independent electrodes are drawn out laterally by sandwiching them between a lower insulating plate and the lower insulating plate is directly attached to an electronic cooling device.