JPS6324266B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulator for measuring the amount of contamination.

Conventional methods for measuring contaminants adhering to pilot insulators include washing the contaminants from the underside of the insulator with a brush or the like and measuring the amount of contaminants, or artificially moistening the insulator with contaminants still attached to the insulator and measuring its conductivity. There are methods to measure soiling by taking advantage of the fact that the degree of soiling differs depending on the amount of soiling. The latter method is
Since the measurement is carried out while the soiled matter remains on the pilot insulator without being washed away, it is possible to measure changes in the soiled matter over time, which is advantageous in terms of soiling control, and also has the advantage that automatic measurement and remote measurement are possible.

Furthermore, as a pilot insulator, it is better to use an actual insulator that is being correlated rather than a modeled shape because the contaminant adhesion distribution, rain washing effect, etc. will be at the same level, and more accurate measurements will be possible. Become.

The pilot insulator used in the artificial wetting method requires electrodes to be provided on the surface of the insulator for measuring conductivity, but the arrangement of the electrodes should be designed so that it is not easily affected by the contamination distribution so as to reduce the error in measuring the amount of contamination. is desirable. In particular, since the contamination withstand voltage of a suspended insulator is mainly determined by the amount of contamination on the lower surface, it is important to know the amount of contamination on the lower surface. Figure 1 shows an average example of the results obtained by dividing the lower surface of an insulator into 18 sections (6 sections radially and 3 sections concentrically), exposing it to natural pollution, and measuring the equivalent salt content in each section. The black circles in the figure are units of equivalent salt content, and their density represents the amount of adhesion. The arrows in the figure indicate the direction of the sea breeze that causes sea salt pollution. As can be understood from this figure, the adhesion density of contaminants is higher on the inner circumferential side than on the outer circumferential side, and is higher in the direction opposite to the contamination source. Figure 2 shows the state of attachment to the grooves and folds on the lower surface of the insulator, and the arrows indicate the direction of the wind. As can be seen, the contaminants are concentrated on the wind direction side a indicated by the arrow, and are particularly concentrated on the windward side a of the folds, and are noticeably less on the leeward side b. It can be seen that there is a very large difference in the distribution of contaminants. Conventional electrode arrangements include providing concentric electrodes near the center and outer periphery of the lower surface of the insulator, or modifying the basic structure, but considering the contamination distribution as described above, Not only is it difficult to obtain accurate measurement values because measurement unevenness and errors are likely to occur due to differences in the adhesion distribution between the electrodes, but there is also the drawback that measurement is impossible if the amount of adhesion on the leeward side of the pleats is small. In addition, there are methods that obtain local values by installing electrodes at required locations on the lower surface of the pilot insulator, but this also requires a small number of samples to measure the amount of contamination on the entire lower surface of the insulator, which has a difference in adhesion distribution, so that accurate measurements cannot be obtained. The disadvantage is that it cannot be obtained.

An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional pilot insulator, and to provide an insulator for measuring the amount of contamination that has an electrode arrangement that takes into consideration the distribution of contamination in an actually used insulator.

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings. As shown in FIG. 3 (front sectional view) and FIG. Set of parallel electrodes {(2A−
1), (2B-1)}, {(2A-2), (2B-2)}... are installed radially from near the center, and these are connected in parallel and the lead wire 3 reduces the amount of contamination. guided by measuring instruments. Conventional materials such as conductive paint and plating are conceivable as the material for the electrodes, but these are undesirable in terms of peeling problems, durability against electrolytic corrosion and corrosion, and weather resistance, so materials such as platinum or its alloys are recommended. By using it, these drawbacks can be overcome, and it is also desirable for its smooth surface and low specific resistance. Further, if the voltage applied between the electrodes is a direct current, galvanic corrosion occurs, so if a suitable alternating current, for example, a high frequency current of several kilohertz, is used, the galvanic corrosion can be prevented.

By arranging parallel electrodes radially as in the present invention, even if there is a difference in the adhesion density of contaminants in the longitudinal direction of the individual electrodes, there is almost no difference in the adhesion density in the width direction of the electrodes. It is possible to obtain an average degree of contamination between

Another embodiment of the invention is shown in FIG.
One set of electrodes (main electrode) as a parallel electrode arrangement
A bridge electrode 4 is further provided in between, and the adjacent electrodes are connected to each other by a concentric arc-shaped conductor 5.The reason for providing the bridge electrode 4 is that when artificially moistened with water vapor etc. during measurement, This is because the distance between the electrodes is too wide and it may be difficult for the water droplets to connect.The bridge electrode 4 assists in electrically connecting the water droplets and reduces variations in measured values. The bridge electrode 4 shown in FIG. 5 is a linear electrode parallel to the main electrode.
As shown in the figure, it may be a collection of a large number of erected electrodes that are not continuous with each other. In this case, it is preferable to use, for example, a cross-shaped electrode so that the distance between the bridge electrodes 4' is as equal as possible. Also the 7th
As shown in Figure B, an even number of intermediate electrodes 4'' are provided between the main electrodes 2A and 2B, and by connecting these alternately to the main electrodes 2A and 2B, measurements can be taken in areas with a small amount of contamination. Sensitivity can be increased.

Next, the reason for providing the conductor 5 is to lower the electrode resistance of the main electrodes by connecting the main electrodes with the same potential with the conductor 5, and also to avoid disconnection of part of the main electrodes due to unforeseen causes. This is to prevent measurement errors from occurring by forming a detour circuit.
Therefore, in this case, the sets of parallel electrodes must be an even number and are alternately connected by lead wires and guided to the measuring instrument. In FIG. 5, reference numeral 6 denotes a semiconductor temperature sensor for correcting measured values, which is welded to a required location on the insulator 1. When measuring the electrical resistance by moistening the bottom surface of the insulator, the conductivity of the moist soiled material changes by about 2% with a 1°C change in temperature around room temperature, depending on the surface temperature, so the surface temperature of the insulator to be measured is successively measured. It is necessary to correct the value. By welding this sensor 6 to the lower surface of the insulator, it becomes possible to automatically correct the temperature of the measured value.

Figure 8 shows an overview of the contamination amount measurement method.
7 is a high frequency current source, 8 is an amplifier, 9 is a temperature correction amplifier, and 10 is a recorder.

What is shown in FIG. 9 is an insulator for measuring the amount of contamination of a multi-fold insulator such as a long-stem insulator, in which three insulator blocks 11 each having four or five pleats are stacked together with upper and lower support metal fittings. 12, 13 and connecting rod 14 to form a 13-fold insulator. The number of stages can be appropriately determined depending on the number of folds of the long trunk insulator actually used. In each insulator block 11, a set of parallel electrodes for contamination measurement is provided in the area A on the middle two caps excluding the upper and lower caps. The electrodes are formed across the front and back surfaces of the two caps, as shown in the developed view in Figure 10 and the front view in Figure 11, and each set of electrodes is formed on the main side, similar to the measurement insulator for the suspension insulator described above. It is composed of electrodes 15, 16 and a bridge electrode 17 disposed between these main electrodes. This bridge electrode may be a set of upright electrodes as shown in FIG. 7-A. These parallel electrodes connect the main electrodes in parallel and are led to the contamination amount measuring device through the hollow part of the insulator block 11 by lead wires 18 and 19.

In the figure, 20 is a conductor that connects adjacent main electrodes, 21 is a semiconductor temperature sensor for correcting measured values that is welded to the required location of the insulator block 11, and 22 is a conductor that is passed from the temperature sensor 21 to the hollow part of the insulator block 11. This is the lead wire that leads to the measuring instrument.

In the above embodiments, measurement insulators for suspension insulators and long-stem insulators have been shown, but other insulators such as station post insulators and bushings can be constructed in the same way.

As described above, according to the present invention, since an actual insulator or a pilot insulator having the same shape and surface condition as an actual insulator is used, there is no possibility of the attachment of contaminants,
Compared to conventional pilot insulators, it has the effect of rain washing similar to that of an actual insulator, and because of the electrode arrangement described above, measurement errors are less likely to occur even if the distribution of contaminants is uneven. Therefore, it can be expected to be extremely reliable.

[Brief explanation of drawings]

FIG. 1 is a distribution diagram of the adhesion of contaminants, FIG. 2 is an explanatory diagram showing the state of adhesion of contaminants on the insulator, FIG. 3 is a front sectional view of the pilot insulator according to the present invention, and FIG. 4 is a bottom view thereof. Fig. 5 is a bottom view showing another embodiment, Fig. 6 is a view taken along the - line in Fig. 5, Fig. 7 is an enlarged view showing the configuration of another parallel electrode, and Fig. 8 is a contamination amount measurement method. FIG. 9 is a longitudinal sectional view showing a measuring insulator for long-stem insulators, FIG. 10 is a developed view showing the arrangement of electrodes, and FIG. 11 is a front view of the insulator block.

Claims (1)

[Scope of Claims] 1. On the surface of a pilot insulator that has the same shape and surface condition as an actually used insulator, a plurality of sets of parallel electrodes for measuring the amount of contamination are arranged radially around the center of the pilot insulator. An insulator for measuring the amount of contamination, further comprising a plurality of sets of parallel electrodes connected in parallel. 2. Claim 1, wherein each set of parallel electrodes is composed of two main electrodes and a plurality of bridge electrodes that are formed within the interval between them and are not continuous with the main electrodes. The described insulator for measuring the amount of contamination. 3. Each set of parallel electrodes consists of two main electrodes and a plurality of intermediate electrodes parallel to the main electrodes formed within the interval between them, and each intermediate electrode is connected alternately to the main electrode. The insulator for measuring the amount of contamination according to claim 1, which is connected in parallel.