JP3167856B2 - Soil detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fouling detector used for detecting the degree of fouling of an insulator surface.

[0002]

2. Description of the Related Art If the surface of an insulator is contaminated, its withstand voltage characteristic is reduced and a ground fault may occur. Therefore, the degree of contamination on the insulator surface is accurately grasped, and the level of the contamination is set to a predetermined value. When it exceeds, it is necessary to take measures such as insulator cleaning. For this purpose, a method called a brush washing method, in which a sample insulator is placed near an actual insulator, the attached matter on the surface is washed off with a brush, and the conductivity of the cleaning liquid is measured, and the degree of contamination is calculated from the value, is used. It has been known for a long time.

[0003] However, since this brush washing method requires manpower, a device for automatically measuring the degree of contamination of the insulator surface has been developed recently. As a typical example, as shown in, for example, Japanese Utility Model Application Laid-Open No. 62-88951, a sampler substrate on which an electrode is formed on an insulating plate is cooled by an electronic cooling device to cause dew condensation to wet the surface. There has been proposed a method of measuring the degree of contamination of a sampler substrate from the electric resistance between electrodes in a state.

[0004]

However, to date, only a basic measurement method has been developed for this method, and a specific structure of a fouling detector that can withstand actual use has not been developed. Has not been established. For this reason,
The sampler substrate of the fouling detector must always be in a state where it can come into contact with the outside air.However, when wetting it and measuring the fouling, how to cut off the influence of the outside air and how to use the electronic cooling device Many problems have been left unsolved, such as how to protect against wind and rain or how to reduce the difference in the degree of contamination between the sampler substrate and the actual insulator surface. SUMMARY OF THE INVENTION The present invention has been made to provide a concrete stain detector which solves such a conventional unsolved problem and withstands actual use.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a contamination detector of the present invention is provided with a path for intake and exhaust of outside air.
, An electronic cooling device provided inside the body, and a electronic cooling device provided below the electronic cooling device.
A sampler substrate surface is condensation Te, the electronic cooling instrumentation
A fan provided in the intake / exhaust passage above the device,
Control and electrical resistance between electrodes of the sampler substrate
And a control unit for performing the measurement . Preferably, the body includes a body main body having an open upper surface and a cover for preventing rainwater intrusion attached above the main body, and an external air flow passage is preferably formed between the body main body and the cover. Further, it is preferable that an openable and closable shutter provided with a foreign matter intrusion prevention means is provided on a lower surface of the body, and a sampler substrate is installed inside the shutter. Furthermore, it is preferable that a simulation shade is provided below the body.

[0006]

The contamination detector according to the present invention is provided with an electronic cooling device and a sampler substrate inside a body having a structure capable of sucking and discharging outside air, and the electronic cooling device is protected from intrusion of rainwater by the body. I have. At the time of contamination measurement, the electronic cooling device is operated to wet the sampler substrate.At this time, the heat radiated from the heat sink of the electronic cooling device is efficiently radiated by separating the intake and exhaust paths inside the body. And efficient wetting can be performed. Then, the control unit measures the electric resistance value between the electrodes of the sampler substrate in a wet state, and detects the degree of contamination.

Further, by installing the sampler substrate inside the shutter on the lower surface of the body, the shutter can be closed at the time of measurement to block the influence of outside air. If a foreign matter intrusion prevention means is provided around the movement path so that the shutter movable portion can be smoothly opened and closed, the invasion of foreign matter from the outside can be prevented and the opening and closing operation can be smoothly performed. By providing the simulated shade below the body, an airflow similar to the surface of the actual insulator is generated on the lower surface of the body, and the amount of contamination of the sampler substrate can be approximated to the amount of contamination of the surface of the actual insulator.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail hereinafter with reference to an illustrated embodiment. 1 and 2 show the overall structure of an embodiment of the present invention, wherein 1 is a vertical arm having a height of about 1 m,
Reference numeral 2 denotes a body which is mounted on the upper part of the arm so as to protrude to the side, 3 denotes a simulated shade which is provided below the body 2 at a predetermined interval, and 4 denotes a lower part of the arm 1 for controlling each part.
A control unit 5 for measuring the electric resistance value is a water supply unit provided at the upper end of the arm 1.

FIGS. 3 and 4 are enlarged sectional views of the body 2 portion. The body 2 includes a body main body 6 having a substantially circular horizontal cross section, and a cover 7 for preventing rainwater intrusion attached above the body main body 6 via four collars 6a. The body body 6 is provided with an exhaust opening 8 in the center of the upper part, and a sufficient gap of about 20 mm is formed above the exhaust opening 8.
Is provided. The periphery of the opening 8 is formed with a gentle slope 8a of about 5 degrees so that rainwater blown to the lower side of the cover 7 in a strong wind or the like is discharged to the outside.
A gap of about 20 mm is also provided between the lower end of the base and the slope 8a. In the embodiment, the heat shield plate 9 is provided above the cover 7 for preventing rainwater intrusion. However, a cylindrical outer wall 10 and a heat shield plate 9 formed on the lower surface of the peripheral portion of the heat shield plate 9 are provided. A gap of about 20 mm is provided between them.

An electronic cooling device 12 having a fan 11 is provided in the center of the body 6. The electronic cooling device 12 uses a Peltier element, and has a function of lowering the temperature of the lower surface thereof and increasing the temperature of the other surface by energization. The fan 11 is necessary to remove heat from the high-temperature surface on the upper side of the electronic cooling device 12, and the inside of the body 2 indicated by an arrow in FIG. Outside air intake and exhaust
By flowing along the path , the cooling function of the electronic cooling device 12 can be efficiently exhibited in a short time. It is clear from FIG.
As described above, the fan 11 is naturally provided in the air intake and exhaust passage.
Have been.

Below the electronic cooling device 12, a sampler substrate 14 for measuring contamination is provided. Sampler board
As is already known, electrode 14 is formed on the surface of an insulating plate simulating the surface of an insulator, which is always in contact with the atmosphere and is contaminated like an actual insulator. The cooling by the device 12 causes dew condensation, and the electric resistance between the electrodes is measured while the surface is moistened.

In this embodiment, an openable and closable shutter 15 is provided on the lower surface of the body 6, and the sampler substrate 14 is installed inside a measurement chamber 16 formed inside the shutter 15. The shutter 15 is slid by a feed screw 18 along a pair of rail guides 17, 17 as shown in FIG. The feed screw 18 is driven by a motor 19. As shown in FIG. 3, foreign matter intrusion prevention means 20 are provided above and below the peripheral portion of the shutter 15, and the shutter 15 moves while contacting the foreign matter intrusion prevention means 20. Accordingly, it is possible to prevent foreign matter from entering the movable portion and prevent malfunction of the shutter 15. The shutter 15 is always open, and is closed only at the time of measurement.

As the foreign matter intrusion prevention means 20, for example, a brush made of mohair (manufactured by YKK) as shown in FIG. 6 can be used. This has the effect of preventing the invasion of outside air to some extent, and also has the effect of removing foreign matter. Mohairs having various cross-sectional shapes such as U-shape and o-shape are commercially available, and mohairs other than the brush shape may be used. Further, as shown in FIG. 7, it is also possible to provide the foreign matter intrusion prevention means 20 simply by providing a side groove. In this case, although there is no complete foreign matter intrusion prevention function, there is an advantage that foreign matter intrusion is more effectively prevented than a flat surface, and the structure is simplified. Further, as shown in FIG. 8, an O-ring may be used as the foreign matter intrusion prevention means 20. This has the advantage that a complete seal is possible. Such various foreign matter intrusion prevention means 20 may be appropriately selected and used.

The simulated shade 3 generates an airflow near the surface of the sampler substrate 14 similar to that of a real insulator,
This is for causing the sampler substrate 14 to be as dirty as the actual insulator surface. The water supply section 5 supplies steam to the inside of the measurement chamber 16 at the time of measurement to humidify the measurement chamber 16.

To perform the contamination measurement by the contamination detector of the embodiment constructed as described above, the contamination detector is installed outdoors such as a substation, and the sampler substrate 14 is brought into contact with the outside air with the shutter 15 opened. And make the surface dirty like a real insulator. As described above, the contamination detector is installed outdoors and is exposed to the wind and rain. However, since the cover 7 and the heat shield plate 9 prevent intrusion of rainwater and the effects of direct sunlight, the contamination detector is built into the body 2. The used electronic cooling device 12 and the like are not damaged. In addition, the provision of the simulated shade 3 causes the same air flow as the surface of the actual insulator around the sampler substrate 14, and can contaminate the same as the actual insulator.

At the time of measurement, first, the shutter 15 is closed to shut off the inside of the measurement chamber 16 from outside air. Then, while increasing the humidity of the measurement chamber 16 with the water supplied from the water supply unit 5,
The sampler substrate 14 is cooled by the electronic cooling device 12. At this time, the fan 11 of the electronic cooling device 12 rotates and sucks the outside air from the outside air suction portion 13, and the sucked outside air is supplied to the electronic cooling device.
Heat is taken from the upper surface of the body 12 and discharged to the outside along the above-mentioned outside air flow passage formed inside the body 2. Therefore, cooling proceeds efficiently in a short time, and the sampler substrate 14
The surface is wetted by dew condensation, and the adhered contaminants are dissolved. In this state, the control unit 4 measures the electric resistance value between the electrodes of the sampler substrate 14 and measures the degree of contamination. The measured value has a high correlation with the degree of contamination of the actual insulator, and has the advantage that it can be measured without requiring any manual operation.

[0017]

As described above, according to the present invention, intake and exhaust of outside air
Since the electronic cooling device and the sampler substrate are provided inside the body with a structure having an air path inside, it is possible to sufficiently remove heat from the electronic cooling device during measurement while protecting them from rainwater etc. Since good cooling is possible, measurement can be performed in a short time. If an openable and closable shutter is provided on the lower surface of the body as in the embodiment, the influence of the outside air can be removed during measurement, and accurate measurement can be performed. Further, if a dummy shade is provided below the body as in the embodiment, an airflow similar to the surface of the actual insulator can be generated around the sampler substrate, and the sample can be contaminated similarly to the actual insulator. Therefore, the present invention provides a concrete structure of a fouling detector which can withstand actual use, and greatly contributes to the industry.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a right side view showing the embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a body part.

FIG. 4 is another sectional view in which a body portion is enlarged.

FIG. 5 is a plan view of a body portion.

FIG. 6 is a partially enlarged view showing foreign matter removing means.

FIG. 7 is a partially enlarged view showing another foreign matter removing means.

FIG. 8 is a partially enlarged view showing another foreign matter removing means.

[Explanation of symbols]

2 body, 3 model shade, 5 control section, 6 body body, 7 cover, 12 electronic cooling device, 14 sampler board, 15 shutter, 20 foreign matter removing means

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Katsukawa 2-56, Suda-cho, Mizuho-ku, Nagoya, Aichi Prefecture Inside Nippon Insulators Co., Ltd. No. Nippon Insulators Co., Ltd. (56) References Japanese Utility Model 1-59857 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01N 27/00-27/24 H01B 17/00 -17/54 G01R 31/12-31/20

Claims (4)

(57) [Claims] 1. A body having an outside air intake / exhaust passage therein.
When the intake and exhaust of the upper side of the the electronic cooling device provided inside the body, the sampler substrate whose surface is provided below the electronic cooling device is condensation, the electronic cooling device
A fan provided in the path,
A contamination detector comprising: a control unit that measures an electric resistance value between electrodes of a puller substrate . 2. The body has a body main body having an open upper surface,
2. The fouling detector according to claim 1, further comprising a cover for preventing rainwater intrusion attached above the cover, and wherein an outside air flow passage is formed between the body main body and the cover. 3. The contamination detector according to claim 1, wherein an openable shutter provided with a foreign matter intrusion prevention means is provided on a lower surface of the body, and a sampler substrate is installed inside the shutter. 4. The fouling detector according to claim 1, wherein a simulated shade is provided below the body.