JPH0755010B2 - Insulator cleaning method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an insulator cleaning method for accurately cleaning insulators such as a maximum insulator tube.

(Prior Art) The maximum voltage of a power plant currently in practical use is 500 KV, and the porcelain bushing used for substation equipment has a height of 5 to 8 m.
In addition, the planned porcelain insulator for 1000KV transmission will have a height of more than 10m. The live-line insulator cleaning device installed as a measure against salt damage of these insulators needs to increase the separation distance from the charging part according to the increase in voltage. However, as the distance between the insulator cleaning device and the porcelain pipe increases, the influence of the wind of the discharge flow and the dispersion of the discharge flow increase,
For this reason, the required water discharge amount for each porcelain tube also increases.

In order to suppress this increase in water volume, use a jet nozzle that has a relatively small reduction in the distance that the water flow reaches even when it is exposed to wind, and use a nozzle in the vertical plane from the bottom to the top along the central axis of the porcelain tube. A rotating type insulator cleaning method in which water is discharged while moving is known. However, although the jet stream has a higher drag force against the wind than the spray stream,
When a crosswind is received, it is unavoidable to deflect it as shown in Fig. 4. Even if the water flow hits the center of the porcelain pipe when there is no wind, the water flow may deviate from the center of the porcelain pipe when there is wind, or in some cases it may be completely removed. It may happen.

There is also an insulator cleaning method in which each nozzle is swung left and right while cleaning from the bottom to the top of the porcelain insulator, but even when there is no wind, there are some areas where optimal water injection is performed and other areas where it is not. , The cleaning will be spotted.

In addition, a guard nozzle aiming at the left and right of the porcelain pipe is installed on both sides of the main nozzle facing the porcelain pipe, and even if the main nozzle is deflected by the wind, the water flow from the guard nozzle is scattered and the entire porcelain pipe is wrapped. However, it is unavoidable that the required amount of water increases and it becomes uneconomical.

(Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, and provides an insulator cleaning method capable of reliably cleaning long porcelain insulators with a small amount of water even in the presence of wind. It was completed in order to do.

(Means for Solving the Problems) The present invention made to solve the above problems is to move a jet water flow from a lower portion of an insulator to an upper portion from a plurality of nozzles arranged at fixed positions around the insulator. In an insulator cleaning method that discharges water while discharging, the wind velocity vector obtained by measuring the average wind direction and wind velocity at the insulator installation position, and the data of the degree of deflection by the wind velocity vector in the direction orthogonal to the jet water flow that is obtained in advance are used. Based on this, the amount of deflection by the wind is automatically calculated for each nozzle, and water is discharged while adjusting the horizontal angle of each nozzle in a direction to cancel the amount of deflection.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 2 shows a nozzle device for jet water flow used in the present invention. (1) is a water supply pipe, (2) is a horizontal rotating shaft, and (3) is this horizontal rotating shaft (2). Bearing horizontally supported on the upper end of the, (4) vertical angle rotation motor,
(5) is a nozzle whose base end is supported by a bearing (3) and which is rotated in a vertical plane by a vertical angle rotation motor (4). Further, (6) is a servo motor, which is capable of accurately rotating the portion above the horizontal rotation shaft (2) within ± 15 ° in the horizontal plane via the gears (7) and (8). it can.

The nozzle (5) discharges water from the lower part to the upper part of the porcelain tube (10) while vertically rotating in the vertical plane by the vertical angle rotation motor (4). The horizontal angle of the nozzle (5) is adjusted by the servo motor (6) according to the wind direction and speed, and the jet water flow is always
Go to the center of (0).

To this end, first, the wind direction and wind speed at the insulator installation position are measured by a sensor, and the wind speed vector B ₁ obtained by this measurement is shown in FIG. ₁ for each nozzle (5) and insulator (1
0) and a vector B _{2 in the} direction of the center line connecting this and a vector B _{3 in the} direction orthogonal thereto are calculated. Then, the servomotor (6) is driven in correspondence with the magnitude of the vector B _{3 which is} a cross wind with respect to the direction of the water discharge from each nozzle (5), and each nozzle (5) is moved to the windward side, that is, the vector B ₃ And rotate it to the opposite side. The adjustment amount of the horizontal angle at this time is determined based on experimentally preliminarily obtained data of the deflection amount of the discharge flow due to the crosswind, that is, the deflection degree data of the wind velocity vector B _{3 in the} direction perpendicular to the jet water flow. . An example of this data is shown in FIG.

In this way, by adjusting the horizontal angle of each nozzle (5) in such a direction as to cancel the deflection of the Giotto water flow due to the wind, the jet water flow from each nozzle (5) is always maintained even when there is wind.
It is possible to exactly hit 0). Since the wind speed and direction change from moment to moment, adjusting the horizontal angle of each nozzle (5) in response to a momentary change causes the jet water stream to meander to the left and right, greatly reducing its reach. On the contrary, the cleaning effect may be reduced. For this, 10 ~
It is preferable to continuously measure the wind speed and the wind direction within a period of about 60 seconds and adjust the horizontal angle based on the average value.

Also, the distance between the nozzle (5) and the surface of the porcelain insulator is the porcelain insulator (10).
Ideally, the horizontal angle of the nozzle (5) should be continuously changed, even when the wind is constant, since the lower part and the upper part are different. However, if the horizontal angle of the nozzle (5) is adjusted according to the discharge of water to the top of the porcelain pipe (10), the distance between the nozzle (5) and the surface of the porcelain pipe will become smaller when water is sprayed to the lower part of the porcelain pipe (10). Therefore, the deviation of the discharge flow becomes small in absolute value, and there is no problem in practical use.

(Effects of the Invention) As described above, the present invention performs water discharge while performing calculation based on the measured wind velocity vector and adjusting the horizontal angle of each nozzle in a direction that cancels the deflection of the jet water flow due to cross wind. Thus, even in the presence of wind, a jet water flow can be accurately applied to the surface of a porcelain insulator or the like from a nozzle installed at a distance. Therefore, according to the insulator cleaning method of the present invention, there is no need to use a guard nozzle as in the conventional case,
It is possible to reliably clean long porcelain insulators with a small amount of water. Further, according to the present invention, since the average wind direction at the insulator installation position, the horizontal angle of each nozzle is adjusted by using the wind velocity vector obtained by measuring the wind velocity,
Accurate cleaning can be performed without the jet water meandering to the left and right to reduce the reaching distance.

Therefore, the present invention has a great contribution to the industrial development as an insulator cleaning method particularly suitable for properly cleaning a long porcelain insulator.

[Brief description of drawings]

FIG. 1 is a plan view illustrating an embodiment of the present invention, FIG. 2 is a perspective view of a nozzle device according to the embodiment, FIG. 3 is a graph illustrating a deflection amount of a jet water flow due to cross wind, and FIG. 4 is a conventional method. It is a top view explaining. (5): Nozzle, (10): Insulator

Claims (1)

[Claims] 1. A method for cleaning an insulator in which jet water flow is moved from a lower portion of the insulator toward an upper portion of the insulator through a plurality of nozzles arranged at fixed positions around the insulator, and an average wind direction and wind speed at the insulator installation position. Based on the wind velocity vector obtained by measuring, and the data of the degree of deflection by the wind velocity vector in the direction perpendicular to the jet water flow that is obtained in advance, the deflection amount by the wind is automatically calculated for each nozzle, A method for cleaning an insulator characterized in that water is discharged while adjusting the horizontal angle of each nozzle in a direction in which the amount of deflection is canceled.