JPH10260270A - Snow accretion measurement device for electric wire - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide an electric wire snowing shape measuring device capable of accurately measuring the snowing shape even if the snowing shape is uneven. An outer diameter sensor includes a light emitter and a light receiver that face each other with an electric wire interposed therebetween; a displacement sensor that detects a separation distance from an object to be measured; and a combined measurement unit of these sensors rotates around the electric wire. A mechanism is provided, so that the outer diameter of the snow-covered shape is measured by the outer diameter sensor, and the concave shape of the complex snow-covered shape is measured by the displacement sensor. A mechanism that can move the measuring unit in the axial direction of the electric wire may be provided so that the snow accretion shape of the electric wire can be measured three-dimensionally. The output of the displacement sensor may be corrected based on the moisture content of snow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the shape of snow on an electric wire, which can accurately measure the shape of snow on the electric wire in real time.

[0002]

2. Description of the Related Art Some of the inventors of the present invention have developed and proposed a snow accretion detection device for electric wires which measures with an outer diameter sensor having a light emitting device and a light receiving device (Japanese Patent Application No. Hei. 28889
No. 7). In this proposal example, as shown in FIG. 5A, a light emitting device 4 is provided on one of left and right opposite pieces of a receiving frame 6.
The light receiver 5 is provided on the other side of the same piece, and the electric wire 1 is passed through the center between the light emitter 4 and the light receiver 5 facing each other. Two sets of the light-emitting device 4 and the light-receiving device 5 are provided in parallel to enable sensing of electric wires including both sides in the radial direction (upper and lower parts in the drawing).

In the above-described electric wire detecting apparatus, if snow adheres to the electric wire 1 passing through the frame 6, the light beam 3 emitted from the light emission 4 is blocked by the snow accretion 2 in addition to the electric wire 1. As a result, the amount of light incident on the light receiver 5 is reduced accordingly, and the state of snow accumulation is detected from the output of the light receiver. FIG. 5B shows a state in which the outer diameter sensor including the light emitting device 4 and the light receiving device 5 is rotated around the electric wire and the snow by the rotation angle θ. By rotating the outer diameter sensor about the electric wire in this way, it is possible to detect the snow-covered state over the entire circumference of the electric wire.

FIG. 6 is a block diagram showing the entire structure including the data processing device 10. An outer diameter sensor composed of a light emitting device and a light receiving device is held by a rotating mechanism 8 and rotates around the electric wire 1 and the snow accretion 2. It has a structure that can be used. The rotation angle of the rotation mechanism is detected by the rotation angle detection device 9 and sent to the data processing device 10. The snow accretion dimension at each rotation angle is detected by the amplifier unit 7 from a signal from the light receiver and sent to the data processing device. Reference numeral 11 denotes a data display for displaying output data of the data processing device 10.

[0005]

According to the previously proposed wire snow detection apparatus according to the prior art, as shown in FIG. 7, polar coordinates (in relation to the electric wires 1 and snow 2 and the light beam of the outer diameter sensor) are shown. H, θ, O), the ON normal passing through the N point
By drawing each time and connecting the intersections of the normals,
The measurement of the convex snow-covered shape shown in FIG. 13
Indicates the intersection of the normals. However, in the above-described electric wire snow accretion detecting device, it is impossible to measure the shape of the concave portion in the uneven snow accretion shown in FIG.

Therefore, the problems to be solved by the present invention (objects)
An object of the present invention is to provide a snow-covering shape measuring apparatus for electric wires that can accurately measure the snow-covering shape even if the snow-covering shape is uneven.

[0007]

SUMMARY OF THE INVENTION The present invention provides an apparatus for measuring the form of snow accretion on an electric wire, comprising: an outer diameter sensor comprising a light emitting device and a light receiving device which face each other with the electric wire interposed therebetween; Displacement sensor; a combination measuring unit of these sensors is provided with a mechanism for rotating around an electric wire, and the outer diameter sensor measures the outer diameter of the snow-covered shape,
The displacement sensor measures a complex snow-covered concave shape.

[0008] A mechanism may be provided for moving the measurement section in the direction of the electric wire axis, so that the shape of the snow covered electric wire can be measured three-dimensionally. The output of the displacement sensor may be corrected based on the moisture content of snow.

[0009]

1 to 3 show an embodiment of the present invention. FIG. 1 shows an outline of a snow accretion shape measuring apparatus.
Fig. 3 shows a sensing state of the displacement sensor of the device, and Fig. 3 is a graph showing an influence of a water content in snow on a measurement error.

The present embodiment comprises an apparatus for measuring the form of snow accumulation by combining an outer diameter sensor comprising a light emitter 4 for emitting a light beam 3 and a light receiver 5 for receiving a light beam, and a displacement sensor 14. The outer diameter sensor measures the snow accretion shape of the electric wire in the same manner as the previously proposed device. Please refer to the above description with reference to FIGS. 5 to 8 if necessary. On the other hand, the displacement sensor 14 detects the separation distance between itself and the shape of the object to be measured; the electric wire 1 and the snow 2 at each rotation angle θ as shown in FIG. Contributes to shape measurement.

In the analysis of the snow-covered shape, two measurement data of the outer diameter sensor and the displacement sensor are compared and determined for each rotation angle θ, and a complex uneven snow-covered shape is analyzed. The determination is made under the following three conditions.

[0012]

(Equation 1)

Before making the above determination, the output characteristics of each sensor with respect to snow accretion are, for the outer diameter sensor, the water content of snow accretion,
Although it was confirmed that the detection was accurate regardless of the density and the thickness of the snow, it was confirmed by experiments that in the case of the displacement sensor, a measurement error occurred as shown in Fig. 3 depending on the water content of the snow and the thickness of the snow. Was done. For this reason, it is preferable that the displacement sensor 14 performs correction based on the water content and the thickness of snow accumulation for each rotation angle θ.

FIG. 4 shows another embodiment of the present invention, in which a measuring unit 16 for measuring the shape of snow accretion 2 is rotated along the outer periphery of the wire sample 1 as described above, and the shape of the cut surface is measured. It comprises a snow accretion shape measuring device combined with a mechanism for sequentially moving in the axial direction of the electric wire later. According to this device, the shape of snow in the longitudinal direction can be grasped. Also, load cell 1
5, the snow mass and the density can be measured. Reference numeral 10 denotes a data processing device that processes data from the measurement unit.

[0015]

According to the apparatus for measuring the snow accretion shape of the electric wire according to the present invention as described above, by combining the outer diameter sensor and the displacement sensor, the snow accretion shape having complicated unevenness can be measured accurately. be able to. It is possible to measure the shape of snow on the field in real time without being influenced by weather conditions such as snowstorm. The intended problem (objective) is to provide an electric wire snow-covering shape measuring device which has the above-described effects, and can accurately measure the snow-covering shape even if the snow-covering shape is uneven. Can be sufficiently achieved.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a snow accretion shape measuring apparatus for electric wires according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a displacement sensor in an electric wire snowing shape measuring apparatus according to an embodiment of the present invention.

FIG. 3 is a graph showing output characteristics of a displacement sensor of the electric wire with respect to snow accretion according to an embodiment of the present invention;

FIG. 4 is a schematic explanatory view of another embodiment of the snow accretion measurement apparatus for electric wires according to the present invention.

FIG. 5A is a schematic explanatory view of an electric wire snow accretion detection device according to a prior proposal, and FIG. 5B is an explanatory diagram of a rotating state of the device.

FIG. 6 is a block diagram of an overall configuration including a data processing device of a wire snow detection device according to a prior proposal.

FIG. 7 is an explanatory view of the operation of the electric wire snow detection device according to the prior proposal.

FIG. 8 (a) is an explanatory diagram of a situation in which a snow accretion detection device according to a prior proposal detects a convex snow accretion. (B) Explanatory drawing of the situation which has detected the uneven snow accretion by the apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric wire 2 Snow accumulation 3 Light beam 4 Light emitting device 5 Light receiving device 14 Displacement sensor 16 Measurement part (combination of outer diameter sensor and displacement sensor)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Nobuyuki Takahashi 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Power Systems Research Laboratory, Hitachi Cable, Ltd.

Claims (3)

[Claims] 1. An outer diameter sensor comprising a light emitting device and a light receiving device which face each other with an electric wire interposed therebetween; a displacement sensor for detecting a separation distance from an object to be measured; An apparatus for measuring the shape of snow on an electric wire, comprising a mechanism for causing the snow to accumulate. 2. An apparatus for measuring the snow accretion shape of an electric wire, comprising a mechanism capable of moving said measuring part in the direction of the electric wire, and capable of three-dimensionally measuring the snow accretion shape of the electric wire. 3. An apparatus for measuring the snow accretion shape of an electric wire, wherein the output of the displacement sensor is corrected by the water content of snow accretion.