JPH0315708B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a portable insulator contamination degree measuring instrument that can easily and quickly measure the degree of contamination of insulators in power transmission and distribution lines on-site.

In the worst case scenario, if contaminants accumulate on insulators used in power transmission lines or distribution lines, it may lead to a flashover accident. Furthermore, even if it does not lead to flash flash, it may cause visible partial discharge, audible noise, and radio wave interference to televisions, radios, etc. For this reason, in areas with heavy pollution, the degree of pollution must be measured and managed periodically or when rapid pollution is likely to occur, such as when a typhoon or strong wind blows from the sea, to ensure that the degree of pollution remains below a certain control standard. Must be. Conventionally, the method of measuring the degree of contamination of insulators has been widely used, such as the brush-washing method, in which soiled objects on the insulator surface are washed with water, and the equivalent salt adhesion density is calculated from the resistivity of the washed water. In this method, it was necessary to completely wash off the contaminants after each measurement, and it was not possible to measure the cumulative contamination at any time. Furthermore, the brush washing method takes a considerable amount of time for measurement and requires some skill in measurement. In addition, as an alternative to the brush washing method, we have developed a device that automatically cleans the insulator and measures the degree of contamination, and a device that artificially moistens the surface of the insulator and measures its leakage resistance and leakage current to continuously determine the degree of contamination. Devices have also been proposed, but the former requires a large device and is limited in its use, while the latter is susceptible to weather influences such as temperature and humidity, as the electrolyte of the conductive material is highly dependent on its moisture absorption conditions. There was a problem in that it was easily contaminated and it was difficult to accurately measure the amount of contamination.

The present invention has been completed with the aim of solving the above-mentioned problems and providing an insulator contamination measuring device that uses the same insulator as actually used insulators and can be used to easily measure on-site. Examples will be described in detail.

1 is an insulator to be measured 2 which has almost the same shape as the actually used insulator.
The capsule 1 has a semi-cylindrical shell piece 3, 4 made of highly airtight material such as plastic, and a pin shaft 5 on one side of its opening edge. The two sides are connected to each other so as to be openable and closable, and the other side is airtightly fastened by a locking piece 6. In this case, it is preferable that each contact surface of the semi-cylindrical shell pieces 3 and 4 be coated with an elastic material such as rubber to improve adhesion. Then, inside the semi-cylindrical shells 3, 4, electrodes 7, 7 made of conductive rubber are preferably provided as an upper electrode, an intermediate electrode, and a lower electrode at appropriate intervals, respectively. This electrode 7 is in electrical contact with the insulator 2 to be measured when the capsule 1 is closed.
Preferably, the base portion 7a is fixed to the inner wall of each semi-cylindrical shell piece 3, 4, and the arcuate contact arm portion 7b has an inner shape that is approximately the same as the outer peripheral shape of the insulator 2 to be measured. 7a and the contact arm portion 7b may be integrally molded from the same material such as conductive rubber, or as shown in FIG. The conductive rubber 7c may be fixed to the surface of the insulator.The point is that when the insulator 2 to be measured is housed in the capsule 1, the electrode surface made of conductive rubber having elasticity and conductivity is electrically securely connected to the insulator surface. It suffices if the structure is in contact with the
8 is an ultrasonic humidifier provided on the outside of the capsule 1 with an air outlet 9 communicating with the inside of the capsule 1, and this humidifier 8 generates mist by an ultrasonic vibrator 10 as shown in FIG. It consists of a fog generation chamber 11, an oscillation circuit that supplies high frequency power to the ultrasonic vibrator 10, a fan 12 that sends fog into the capsule 1, etc., and the ultrasonic vibrator 10 attached to the fog generation chamber 11 generates high frequency When vibrating, the water in the misting chamber 11 is atomized, and the mist is injected into the capsule 1 from the outlet 9 by the fan 12. In order to uniformly moisten the entire surface of the insulator 2 to be measured in the capsule 1, the air outlet 9 attached to the humidifier 8 is provided at least in two locations, upper and lower. It is preferable to arrange the insulator at a certain angle slightly upward toward the back surface of the shade. A display section 13 is electrically connected to the capsule 1 by a cable 14. It is equipped with a voltage generator and a pointer or digital display that converts and displays the leakage current on the insulator surface flowing between the electrodes 7 into an equivalent amount of salt deposited. In addition, in the above embodiment, the humidifier 8 and the capsule 1
Although the embodiment has been described in which the capsule 1 and the humidifier 8 are integrated, the present invention is not limited to this. For example, as shown in FIG. Pipe 1 between
In this case, a mist outlet 9 is provided in the capsule 1 in advance, and the outlet 9 and the pipe 15 are connected. Further, the shape of the capsule 1 is not limited to a cylindrical shape, but may be any shape as long as it can accommodate the insulator to be measured in an airtight manner.

In this structure, the insulator 2 to be measured is housed inside the capsule 1, and the semi-cylindrical shell piece 3,
4 is closed, the contact surface made of conductive rubber of the electrode 7 provided inside the semi-cylindrical shell pieces 3, 4 is in close contact with the insulator 2 to be measured and electrically connected. When a high frequency voltage is applied to the ultrasonic vibrator 10 of the humidifier 8, the ultrasonic vibrator 10 emits ultrasonic waves into the water, which turns the water into fine particles and scatters them into the air, creating fog. Occur. Then, this mist is injected into the capsule 1 from the air outlet 9 on the airflow generated by the fan 12, and the surface of the insulator 2 to be measured is moistened in just the right amount. Therefore, the electrode 7 of the insulator 2 to be measured,
A constant voltage is applied between electrodes 7, the current flowing between electrodes 7 and 7 is measured, and this is converted to the equivalent salt adhesion amount on the display section 13. The equivalent salt adhesion amount is obtained by reading the graduated pointer or digital display. be able to. The amount of fog generated can be controlled by adjusting the output of the built-in oscillation circuit. In this way, in the present invention, the insulator to be measured 2 is forcibly moistened in the capsule 1 which can be opened and closed using the ultrasonic humidifier 8, so each part of the insulator to be measured can be accurately and easily wetted in a short time. In addition to being able to wet the insulator, it also increases the safety of the work, and has the great advantage of being able to wet the entire insulator surface in a constant state without being affected by the external atmosphere such as temperature and humidity. Furthermore, measurements can be made on insulators that are normally used for actual lines without the need for special shaped insulators or specially processed insulators. Not only can the upper and lower surfaces of the insulator cap be measured separately, but by adding an electrode 7, it is also possible to measure the degree of contamination in smaller parts at the same time. Furthermore, capsule 1 is 2
Since it is a two-part type in which two semi-cylindrical shell pieces 3 and 4 are connected, there is no need to remove the insulator from the armrest, etc., and it is lightweight and portable.The insulator can be removed from the site and measured, and then measured again. There is no need for troublesome installation work, and the advantage is that the equivalent salt adhesion amount can be easily measured on site.

As is clear from the description of the above embodiments, the present invention generates artificial fog by using an ultrasonic humidifier in a capsule that can be opened and closed and has an electrode inside that is in close contact with the circumferential surface of the insulator to be measured. The insulator to be measured is forcibly moistened, and the degree of surface contamination of the insulator to be measured is converted into equivalent salt adhesion amount and density and displayed using a display unit connected to the electrode, making it easy to measure the degree of contamination of the insulator on site. Moreover, it can perform measurements quickly, and as it solves the problems of conventional insulator contamination level measuring instruments, it will greatly contribute to the development of the industry.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing an embodiment of the present invention, Fig. 2 is a partially cutaway plan view, Fig. 3 is a partially cutaway front view of the humidifier section, and Fig. 4 is another embodiment. It is a partially cutaway perspective view showing the. 1: capsule, 3, 4: semi-cylindrical shell piece, 7: electrode, 8: humidifier, 13: display section.

Claims (1)

[Claims] 1 A capsule 1 in which the semi-cylindrical shell pieces 3 and 4 are connected to each other so as to be openable and closable and are large enough to store the insulator to be measured inside.
and an arc-shaped electrode 7, which is provided inside these semi-cylindrical shell pieces 3 and 4, and at least the portion that comes into close contact with the circumferential surface of the insulator to be measured is made of conductive rubber;
an ultrasonic humidifier 8 that generates artificial mist inside the capsule 1 to forcibly moisten the insulator to be measured;
and a display section 13 which is connected to the electrode 7 and which converts and displays the surface fouling degree of the insulator to be measured into equivalent salt adhesion amount and density.