JP2000121603A - Dew condensation sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dew condensation sensor capable of detecting the same state of condensation as the condensation generated on the surface of an insulator or the like in an power transmitting and transforming apparatus and durable for long-term outdoor use. SOLUTION: This dew condensation sensor 1 is composed of two kinds of metals 3, 5 having different ionization tendencies and an insulating material 4 installed between them. When dew condenses on the surface of the insulating material, 4, an oxidation-reduction reaction occurs between the two metals 3, 5 through the resultant moisture to generate an electromotive voltage between the both metals 3, 5. The state of condensation can be detected by monitoring the electromotive voltage with a detection means 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dew sensor for detecting dew. The dew condensation sensor of the present invention is used, for example, to detect the occurrence of dew condensation on the surface of insulators used in power transmission and transformation equipment.

[0002]

2. Description of the Related Art Insulators of transmission and substation equipment installed outdoors have their surfaces contaminated by salt or the like. In addition, condensation may occur on the surface of the insulator due to a change in temperature or the like. If dew condensation occurs while the insulator surface is contaminated, the insulation performance of the insulator surface decreases. Therefore, it is desirable to detect the state of occurrence of dew condensation in power transmission and transformation equipment. However, conventionally, there is no sensor for detecting the dew condensation of the power transmission and transformation equipment.

[0003]

On the other hand, there has been a dew sensor for general consumer use. This applies a phenomenon in which a resin is made of a dispersion of carbon and a resin expands and contracts due to moisture absorption and desorption of a moisture-sensitive film, thereby changing contact resistance between carbon particles. The conventional dew sensor for general use cannot provide stable performance over a long period of time in a natural environment such as outdoors. In addition, the moisture absorption and desorption of the moisture-sensitive film is not equivalent to the dew condensation generated on the insulator surface of the power transmission / transformation equipment, so that a dew condition equivalent to the dew condensation generated on the insulator surface cannot be detected. For this reason, a general-purpose consumer dew sensor cannot be used as a dew sensor for power transmission and transformation equipment.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dew sensor capable of detecting a dew condition equivalent to dew condensation on an object to be detected and enabling long-term outdoor use.

[0005]

According to the present invention, in order to achieve the above object, a dew sensor is constituted by two kinds of metals having different ionization tendencies and an insulator disposed between the two kinds of metals. . When condensation forms on the surface of the insulator, moisture is generated by the condensation, an oxidation-reduction reaction occurs between the two types of metals, and a battery is formed. Voltage is generated. By monitoring this electromotive voltage, the condition of dew condensation can be detected.

[0006] This dew sensor can create a dew condition equivalent to the dew condition of the insulator by, for example, placing it in the same environment as the insulator whose dew condition is to be detected. it can. In addition, stable performance can be obtained over a long period of time even in a natural environment such as outdoors. Further, since the dew condensation sensor is formed with a battery and utilizes the electromotive voltage, it can be operated without a power source.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the appearance of the condensation sensor, and FIG.
2 shows a cross section of the dew condensation sensor and a detecting means connected thereto. The base 2 is provided for attaching the dew condensation sensor 1 to another support 13 or the like. The base 2 is formed of an insulator. A second metal 3 serving as a negative electrode, an insulator 4, and a first metal 5 serving as a positive electrode are mounted on the base 2 in an overlapping manner. As the first metal 5 and the second metal 3, metals having different ionization tendencies are used. For example, Ag is added to the first metal 5 serving as a positive electrode.
However, Zn is used for the second metal 3 serving as the negative electrode. As the insulator 4, it is preferable to use a material equivalent to the insulator whose dew condensation is to be detected.

The above components are connected and fixed by stud bolts 6. One end of the stud bolt 6 is screwed into the screw hole of the first metal 5 through a through hole provided in the center of the insulator 4, the second metal 3, and the base 2, and the other end is on the lower surface side of the base 2. With screws. The stud bolts 6 serve as positive electrodes on the lower surface of the base 2 for drawing out the potential of the first electrode 5. An insulating tube 7 is placed at an intermediate position of the stud bolt 6 so that the first metal 5 does not contact the second metal 3 to cause a short circuit.

An O-ring 8 is disposed on the contact surface between the components to prevent water from entering the inside. 1 for base 2
Two through holes 9 are formed, and a bolt 10 is screwed to the second electrode 3 from the lower surface side of the base 2. This bolt 10
Is a negative electrode for extracting the potential of the second electrode 3. Base 2
Are provided with a plurality of screw holes 11, and the dew condensation sensor 1 is mounted on the support 13 by the mounting screws 12.

Stud bolt 6 (positive electrode) and bolt 10
(Negative electrode) detecting means 1 for monitoring the electromotive voltage between both electrodes
4 are connected. One example of the detection means 14 is a voltmeter,
In this case, the value of the electromotive voltage can be displayed without a power supply. By setting the scale of the voltmeter to a value indicating the condition of dew condensation, the dew condition can be read directly. Also,
The detecting means 14 may have a communication function so that the detected electromotive voltage can be sent to the outside or an alarm can be sent when the dew condensation condition exceeds a reference value.

[0011] The dew sensor 1 configured as described above
It is placed near the insulator of the power transmission and transformation equipment whose dew condensation is to be detected. As a result, the surface of the condensation sensor 1 is contaminated and condensed to the same extent as the surface of the insulator. When the surface of the dew condensation sensor 1 forms dew, a battery is formed by the first metal 5-the condensed water-the second metal 3, and an electromotive voltage is generated between the first metal 5 and the second metal 3. The detecting means 14 displays this electromotive voltage or transmits the dew condensation condition to the outside.

According to the dew condensation sensor 1 described above, the dew condensation on the sensor surface is equivalent to the dew condensation on the surface of the insulator to be measured, so that the detection accurately reflects the dew condition of the measurement target. Can be. In addition, since the dew sensor 1 is composed of only two kinds of metals 3, 5 and the insulator 4, stable performance can be obtained for a long period of time even in a natural environment such as outdoors.

FIGS. 3 and 4 show another embodiment of the condensation sensor of the present invention. 3 and 4, only the dew condensation sensor is shown, and the detection means is not shown. In the condensation sensor 21 shown in FIG. 3, a second metal 23, an insulator 24, and a first metal 25 are arranged on a base 22. A through-hole is formed in the center of the first metal 25, and the cylindrically formed second metal 23 is disposed therein. First
So as to fill the space between the metal 25 and the second metal 23,
An annular insulator 24 is arranged. Each of these parts is similar to the examples shown in FIGS.
2 are attached by bolts from the back side, and the potential of each metal is drawn out. The same applies to the case where an O-ring is arranged between the components in order to prevent water from entering between the components.

The dew condensation sensor 21 shown in FIG. 3 is mounted using the mounting hole 26 so that the upper surface thereof is exposed to the same environment as the insulator whose dew condensation is to be detected. When dew condensation occurs on the surface of the dew condensation sensor 21, a battery is formed by the first metal 25, the dew condensation, and the second metal, as described in FIGS.
It is the same as FIG. In the condensation sensor 31 shown in FIG.
In order to increase the capacity of the battery constituted by the first metal 35-the insulator 34-the second metal 33, the contact length of each component is increased. First metal 35 and second metal 33
Is formed so that the opposing parts enter,
It is arranged on a base 32. An insulator 34 having a shape that fills a space between the two metals 33 and 35 is disposed. The base 32 has a mounting hole 36 for mounting to a support.

The dew condensation sensor 31 of the present embodiment can also be constructed in the same manner as the embodiment shown in FIGS. In addition, a battery is formed by the first metal 35-condensed water-the second metal 33 in the same manner. However, in this example, since the battery is formed long, the electromotive force to be taken out can be increased.

The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. For example, the first metal, the insulator, and the second metal can be formed by integral molding. In this case, the O-ring between the components can be omitted.

[0017]

According to the present invention, it is possible to obtain a dew condensation sensor capable of detecting a dew state equivalent to dew condensation on an object to be detected and enabling long-term outdoor use.

[Brief description of the drawings]

FIG. 1 is a diagram showing an appearance of a first embodiment of a dew condensation sensor to which the present invention is applied.

FIG. 2 is a diagram showing a cross section of the condensation sensor of FIG. 1 and a relationship between the condensation sensor and a detecting unit.

FIG. 3 is a diagram showing an appearance of a second embodiment of the condensation sensor of the present invention.

FIG. 4 is a view showing the appearance of a third embodiment of the condensation sensor of the present invention.

[Explanation of symbols]

 1,21,31 ... condensation sensor 2,22,32 ... base 3,23,33 ... second metal (negative electrode) 4,24,34 ... insulator 5,25,35 ... first metal (positive electrode) 6 ... Stud bolt 7 ... Insulation tube 8 ... O-ring 9 ... Through hole 10 ... Bolt 11 ... Mounting hole 12 ... Mounting bolt 13 ... Support 14 ... Detecting means 26,36 ... Mounting hole

Claims (1)

[Claims] 1. Two kinds of metals having different ionization tendencies,
And an insulator disposed between the two metals.
When dew condensation occurs on the surface of the insulator, a battery is formed by the two types of metal and moisture due to dew condensation, and an electromotive voltage corresponding to the dew state is generated between the two types of metal. Characteristic condensation sensor.