JPH05284628A - Method of preventing galloping of multiconductor transmission line - Google Patents

Abstract

PURPOSE:To prevent the galloping by attaching a snow adhesion restrainer to the conductor on the side of being caught by the loose catch of a loose spacer. CONSTITUTION:Generally, since spacers are attached at intervals of 30-50m, if loose spacers 2 are attached all at once in the longitudinal direction of a transmission line, the conductor 1A on the side of a fixing and catching part 3 does not need the attachment of a snow adhesion restrainer, but the conductor 1B on the side of a loose catch part 4 gets in the same condition as the condition that a single conductor is stretched across, so there is possibility of excessive snowing and icing occurring. Therefore, excessive snowing and icing is prevented by attaching a snow adhesion restrainer (for example, a snow ring) 5 to the conductor 1B on the side of being caught by the loose catch 4. If the snowing and icing is small without becoming excessive, it does not cause large damage even if it is subjected to wind. Hereby, galloping can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preventing galloping in a multiconductor transmission line by using loose spacers.

[0002]

2. Description of the Related Art In order to prevent galloping of a double conductor transmission line, a spacer configured to hold a conductor loosely is used, and one loose wire holding part of the spacer is rotatably attached to an electric wire. A large number of spacers, which are gripped and fixed to the other fixed wire gripping part on the wire, are attached to the power transmission line at intervals at predetermined intervals, and the rotatable loose gripping part of each spacer is a double conductor power transmission line. The conductors are arranged so as to be alternately gripped in the longitudinal direction, and snow-diffusing rings are attached to the conductors of this double conductor to prevent the occurrence of snow accretion and galloping.
The wire twist prevention and galloping prevention spacers for the snow-hardened wire of No. 1 are known.

[0003]

In the method of preventing galloping using the spacer as described above, one rotatable loose grip portion of the spacer is attached so as to be alternately located in the longitudinal direction of the power transmission line. Therefore, the twisting rigidity of each wire of the double conductor becomes equal, and it becomes easy for icing snow of the same shape to develop on each wire.For this reason, the lift generated when the icing snow receives wind is the main cause of galloping. Therefore, there is a problem in that the uniform lifting force tends to occur and the galloping prevention effect is not sufficient. In addition, the twist angle of the electric wire due to icing snow increases toward the center of the span, whereas the snow-difficulty ring is evenly attached to all spans.
It is uneconomical because it does not fit the actual situation.

An object of the present invention is to solve the above-mentioned problems and to more effectively prevent galloping of a multi-conductor transmission line having loose spacers.

[0005]

In order to achieve the above-mentioned object, a method for preventing galloping of a multi-conductor transmission line according to the present invention includes a loose spacer 2 having at least one loose grip portion 4 for loosely gripping an element conductor. In a multi-conductor transmission line that is attached in the radial direction uniformly so that the loose gripping portion 4 of each spacer grips the same conductor 1B of the multi-conductors 1A and 1B, at least the loose gripping portion 4 of the loose spacer is By attaching a snow resistant device to the conductor 1B on the gripped side, galloping is prevented.

The snow-hardening device mounted on the conductor 1B on the side gripped by the loose gripping portion 4 of the loose spacer 2 which is uniformly mounted in the radial direction is a spiral rod wound around the conductor, for example, S and Z. Is a spiral rod 9 (FIG. 2) wound around alternately, or a spiral rod 10 (FIG. 7) twisted in the direction opposite to the twist direction of the conductor, or a snow-hardening ring, for example, a snow-hardening ring 5 (FIG. 5), Alternatively, there are a pair of snow-drinking rings 8 (Fig. 6) connected by a bar, and a snow-drinking ring 2 of low Curie point material (Figs. 10 and 11),
Alternatively, a combination of the snow-difficult snow ring 5 and the spiral rod 11 (FIG. 8), or a conductor winding wire 17 of a low Curie point material
(FIG. 12) or the heating wire 20 (FIG. 13).

Further, in the multiconductor power transmission line to which at least one loose spacer 2 having the loose grip portion 4 for loosely gripping the conductor is attached as described above, at least one of the conductors 1B on the side gripped by the loose grip portion 4 Part or all of the heating element 20 that generates heat due to the current flowing through the conductor
By mounting (FIG. 13), galloping is prevented.

The heating element 20 wound around the conductor is a heating wire made of, for example, a magnetic metal wire made of a Ni--Fe alloy, and the heating wire 20 of this magnetic metal wire is located on the side where the loose gripping portion 4 grips the heating wire 20. When wrapped around conductor 1B, both conductors 1
The conductor 1A on the side that is not gripped by the loose gripping portion, as necessary to balance the impedances of B and 1A.
Also, the heat generating wire 20 of the magnetic metal wire is wound around the conductor portion facing the heat generating wire winding portion of the conductor 1B.

[0009]

The one conductor 1B of the multi-conductor power transmission line is loosely gripped by the loose gripping portion 4 of the loose spacer 2 and the other conductor 1A is fixedly gripped by the fixed gripping portion 3 so that the fixedly gripped side. The conductor 1A and the conductor 1B on the loosely gripped side have different torsional rigidity, and the icing snows of the conductors 1A and 1B are generated in different shapes. Therefore, the lift force when the frosted snow on the conductors 1A and 1B in the span receives wind is not uniform lift force that tends to cause galloping, but is non-uniform, so that galloping is prevented.

Generally, since the spacers are attached every 30 to 50 m, if the loose spacers 2 are attached uniformly in the longitudinal direction of the power transmission line, the conductor 1A on the side of the fixed grip portion 3 does not require the attachment of the snow-hardening device. However, since the conductor 1B on the loose gripping portion 4 side is in a state similar to a state in which a single conductor is stretched over the span, excessive icing snow may occur. Therefore, a snow-hardening device is attached to the conductor 1B on the side gripped by the loose grip 4 to prevent excessive snow accretion. If the icing snow does not become too large and is small, it will not generate a large lift even if it receives wind.

The heating element 20 attached to the conductor 1B on the side gripped by the loose gripping portion 4 shown in FIG. 13 generates heat due to the current flowing through the conductor and melts snow accretion on the conductor.

The heating element 20 is attached such that when the heating wire 20 of the magnetic metal wire is wound only around the conductor 1B on the side gripped by the loose grip portion 4, the impedance of the conductor 1B and the other loose grip portion are gripped. There is a difference in impedance from the conductor 1A on the non-operating side. Therefore, both conductors 1A, 1B
If ordinary spacers 18 and 19 which are not loose are attached between them, current flows through the spacers 18 and 19 and the spacers 18 and 19 are overheated. In order to prevent this, the heating wire 20 of the magnetic metal wire is also wound around the other conductor 1A portion which is not gripped by the loose gripping portion facing the conductor 1B portion around which the heating wire 20 of the magnetic metal wire is wound. Both conductors 1
By winding the heating wire 20 of a magnetic metal wire around A and 1B in the same manner, the impedances of the conductors 1A and 1B are eliminated, and therefore the spacers 18 and 19 do not flow current and do not overheat.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example in which the present invention is applied to a two-conductor power transmission line, and each conductor 1 of the two-conductor power transmission line laid in parallel.
Loose spacers 2 (2 ₁ , 2 _2, ... 2 _n ) are attached to A and 1 B every 20 to 50 m in the longitudinal direction. Reference numeral 3 is a fixed gripping portion provided at one end of the loose spacer 2, and 4 is a loose gripping portion provided at the other end.

The loose spacer 2 having the fixed grip portion 3 and the loose grip portion 4 is constructed, for example, as shown in the longitudinal sectional view of FIG. 3 and the transverse sectional view of FIG. As shown in the figure, a fixed gripping part 3 for fixing and gripping a conductor is provided at one end of the spacer rod 2a, and a loose gripping part 4 provided at the other end of the spacer rod 2a includes a hollow ring body 4a and a hollow interior 4b. And a conductor insertion hole 4c is formed on both sides, a conductor fixing portion 4d for fixing and holding the conductor is inserted in the hollow interior 4b, and the hollow ring body 4a is rotatably assembled to the conductor fixing portion 4d. , The conductor fixing portion 4d which holds and holds this conductor 1B
Is used as a rotation axis, and the hollow ring body 4a and the spacer rod 2a side are configured to be rotatable.

The conductor 1A fixed and gripped by the fixed grip portion 3 and the conductor 1B rotatably gripped loosely by the loose grip portion 4 without being fixed are mutually in a plane perpendicular to the conductor axis. The other gripper can be rotated about the rotation axis. By mounting the loose spacers 2 on the multi-conductor transmission line in this manner, the torsional rigidity of the conductor 1A on the fixedly gripped side and that of the conductor 1B on the loosely gripped side become different, so that the attachment of each wire is prevented. Ice and snow are generated in different shapes, and the lift when the ice-accumulated snow receives the wind does not become a uniform lift that causes galloping, so galloping is prevented.

The conductor 1 on the side gripped by the loose grip 4 is added to the multi-conductor transmission line to which the loose spacer 2 is attached as described above.
The snow-hardening device 5 is attached to B at a predetermined interval. As shown in FIG. 5, the snow-hardening device 5 prevents the snowflakes S attached to the conductor one by one from slipping around the conductor circumferential surface along the twisted groove on the surface of the twisted wire conductor and wrapping around the conductor lower surface. It prevents the snow adhering to the conductor from growing excessively. The snow-diffusing device 5 shown in FIG. 5 is a snow-diffusing ring made of polycarbonate, polyamide resin, or other resin and formed in an annular shape, and its mounting interval is appropriately changed according to the outer diameter of the conductor.

When the snow-hardening device 5 is attached to the spanned electric wire at intervals in the longitudinal direction, the electric wire end support point C (FIG. 1) where the twist angle of the electric wire is zero is installed. Is loosely mounted with a large mounting interval, and in the vicinity of the center of the span where the electric wire has a large helix angle, the mounting interval is small and the loose spacers 2 are closely mounted.

When the snow-hardening device 5 is attached to the electric wire in this manner, the galloping prevention effect is enhanced. When the loose spacers 2 are attached all at once in the longitudinal direction of the power transmission line, the spacers are generally attached every 30 to 50 m, so that the conductor 1A on the side held by the fixed grip portion 3 of the loose spacer 2 is attached.
Does not require the installation of a snow-hardening device, but the conductor 1B on the side gripped by the loose gripping part 4 is similar to the state in which a single conductor is stretched over a span, and this is not a pure single conductor. A reaction force moment due to the frictional force of the loose grip portion 4 can be expected. For this reason, the installation intervals of the snow-difficulty devices are tightly installed in the center portion of the span where snow is particularly likely to develop, and the installation intervals of the snow-difficulty devices are roughly installed or omitted near the support points.

With the above-mentioned structure, the conductor 1B on the loose gripping portion 4 side is free from excessive icing snow as compared with the conductor 1A on the fixed gripping portion 3 side, and the torsional rigidity of each conductor 1A, 1B is also improved. It will be very different. For this reason, the shapes of the icing snows are remarkably different from each other, and uniform lift, which is one of the factors causing galloping, is not generated, so galloping is less likely to occur in the entire system. Further, by roughening the number of snow-diffusing devices installed near the span terminal, installation work and material labor can be greatly saved and rationalized, so that the economical effect thereof is extremely large.

FIG. 6 shows a modification of the snow-difficulty device which also serves to prevent wind noise.
Set the pair of snow-retaining rings 6a and 6b to 180 ° halfway around the ring.
Also connected to both ends on the diametrical line separated by bars 7 and 7 (only one bar 7 is shown in the figure, but there is also a bar 7 on the diametrical line on the opposite side of the conductor (not shown)) to prevent wind noise. The snow-hardening device 8 is configured. The snow-hardening device 8 configured in this manner is also mounted on the conductor 1B in the same manner as in the embodiment shown in FIG. 1, so that snowflakes adhering to the electric wire will move along the groove on the surface of the twisted wire along the circumferential surface of the conductor. Prevents the snow adhering to the wires from growing excessively by preventing the snow from advancing to the lower surface side.

In the embodiment shown in FIG. 2, the loose spacer 2
In the embodiment in which a snow-preventing ring is attached to the conductor 1B held by the loose gripping portion 4 of FIG. is there. In this spiral rod 9, spiral rods 9s from S and spiral rods 9z from Z are alternately wound around the element conductor 1B.

In the embodiment shown in FIG. 7, instead of winding the spiral rod of S and the spiral rod of Z around the element conductor 1B as described above, the spiral rod opposite to the twist direction of the element conductor 1B is used. 10 is an example in which 10 is wound. As with the above-described snow-diffusing device, any of the spiral rods wound around the conductor as shown in FIGS. 2 and 7 has a structure in which the snowflakes attached to the electric wire extend along the groove on the surface of the twisted wire conductor. It is possible to prevent the snow adhering to the electric wires from growing excessively by preventing the snow from advancing to the lower surface side while sliding on the peripheral surface.

The embodiment shown in FIG. 8 is an embodiment in which the snow-difficulty ring 5 and the spiral rod 11 from S are used together and mounted on the conductor 1B. As shown in the end view of FIG. Applies when is a smooth surface. In the case of this smooth conductor, since there are no deeper grooves on the surface, snow flakes adhering to the conductor surface will rotate in either the left or right direction on the smooth peripheral surface of the conductor, and the snow adhering ring will not adhere to the snow. Since it is not possible to prevent the rotation of the snowflakes and prevent the development and enlargement of snowflakes, the snowflakes are divided by the difficult snowfall ring 5, and the rotation of the snowflakes along the conductor surface is prevented by the spiral rod 11. This makes it possible to obtain an effect equivalent to that obtained when the snow-difficulty ring is attached to the conductor having the groove on the conductor surface.

FIG. 10 shows an embodiment in which the snow-hardening ring 12 made of a low Curie point material is attached to the conductor 1B. This snow ring 12 made of low Curie point material has a temperature of 0 ° C.
In the vicinity, a small amount of current is sufficient to generate heat, and it has the characteristic that it does not generate heat at high temperatures, so it becomes one type of heating element. The low-Curie snow-hardening ring 12 attached to the conductor 1B generates heat due to the hysteresis loss and the eddy current loss due to the alternating magnetic field generated by the current flowing through the conductor 1B, and the heat generated melts the snow adhered to the conductor 1B. The effect of preventing snow accretion development can be expected at the initial stage of snow adhesion.

FIG. 11 shows an embodiment of a snow-hardening ring 12 using a low Curie point material. Grooves 14 are provided inside the split rings 13a and 13b made of a pure iron sintered body. A low Curie point material 15 is embedded in the groove 14, and a ring spring 16 on the outer periphery is used to attach the split rings 13a and 13b with the conductor sandwiched therebetween. 1
Reference numeral 7 denotes an elastic piece, which is used as needed to enhance the effect of fixing the split rings 13a and 13b.

In FIG. 12, instead of attaching the snow-hardening ring 12 having a low Curie point to the conductor 1B as in the embodiment shown in FIGS. 10 and 11, the wire made of a low Curie point material is galvanized, Alternatively, it is an embodiment in which the low Curie point wire strip 17 coated with aluminum or the like is closely wound around the conductor 1B at appropriate intervals and is continuously wound. In this embodiment, the wire strip 17 is automatically wound by a wire winder. It is efficient because it can be wound around the conductor 1B. The low Curie point line 17 wound around the conductor 1B in this way is
Generates heat due to the current flowing through the conductor and melts snow on the conductor.

The snow-hardening device is attached to the conductor 1B on the side of the loose spacer 2 to which the loose grip 4 is attached, as in the embodiment shown in FIGS. It can also be attached to 1A.

In the embodiment shown in FIG. 13, at least one loose spacer 2 is attached to both conductors 1A and 1B of a multiconductor transmission line, and at least one of the conductors on the side where the loose grip portion 4 grips the conductor. 1 part or all part of 1B,
The heating element 20 that generates heat due to the current flowing through the conductor 1B is attached. The heating element 20 is made of, for example, a Ni-Fe alloy (mainly Ni, the balance being Fe, and a small amount of Mn, C
A heating wire made of a magnetic metal wire (including r, Al, etc.) is used and wound around the outer periphery of the conductor 1B in the direction opposite to or the same as the twist direction of the outermost layer. In this way, the heating element 20 wound around the conductor 1B on which the loose gripping portion 4 grips the snow is likely to generate heat by the current flowing through the conductor and melts the snow on the conductor 1B.

Since the magnetic metal filament heating element 20 made of the Ni--Fe alloy has a large relative permeability even when the current flowing through the conductor is small, it can generate heat up to a temperature at which snow can be melted. Even if the current flowing through the conductor becomes large, magnetic saturation is fast and the amount of heat generated is small, so that the conductor temperature does not rise transiently. The heating wire 20 may have any shape such as a round wire, a rectangular wire, and a tape shape, and by preforming it in a spiral shape in advance, it becomes easy to attach it to an overhead power transmission line already installed. ..

As described above, the heating wire 2 of the magnetic metal wire is attached to the conductor 1B on the side gripped by the loose grip portion 4 of the loose spacer 2.
When 0 is wound over a certain length, the impedance of the conductor 1B increases, which is different from the impedance of the conductor 1A that is not gripped by the loose grip (the conductor gripped by the fixed grip 3) 1A. Both conductors 1A, 1
When a difference occurs in the impedance of B, both conductors 1A, 1
When normal fixed spacers 18 and 19 which are not loose are attached between B, current flows through the spacers 18 and 19 as shown by the chain line in FIG.
8 and 19 will overheat. In order to cope with this, the heating wire 21 is also wound around the portion of the other conductor 1A on the side which is not gripped by the loose gripping portion facing the portion of the conductor 1B around which the heating wire 20 is wound. Make sure that there is no difference in impedance between 1B and spacers 18, 19
Prevent current from flowing into it to prevent it from overheating.

[0031]

As described above, according to the method of preventing galloping of a multi-conductor power transmission line of the present invention, one conductor of the multi-conductor power transmission line is loosely gripped by the loose grip portion of the loose spacer and the other conductor is fixed and gripped. Since the snow-holding device is attached to this loose gripping side conductor, it is possible to prevent the development of excessive snow accretion and to make the conductor on the fixed gripping side and the conductor on the loose gripping side different in torsional rigidity. Since the icing snow of each electric wire is generated in a different shape, the lift force when the icing snow of each conductor receives wind can be made non-uniform, so that the galloping prevention effect is remarkable.

Further, by mounting a heating element on the loose gripping side to generate heat by the current flowing through the conductor, snow accretion of the conductor can be melted. Further, by mounting this heating element not only on the loose gripping side conductor but also on the other conductor, it is possible to balance the impedance of both conductors and prevent heat generation due to the current of the spacer.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a sectional view of one embodiment of a loose spacer.

FIG. 4 is a side view of an embodiment of a loose spacer.

FIG. 5 is a mounting state diagram of one embodiment of the snow landing device.

FIG. 6 is a mounting state diagram of another embodiment of the snow landing device.

FIG. 7 is a mounting state diagram of still another embodiment of the snow landing device.

FIG. 8 is a mounting state diagram of another embodiment of the snow landing device.

9 is an enlarged end view of the conductor shown in FIG.

FIG. 10 is a mounting state diagram of an embodiment of a snow-hardening device using a low Curie point material.

FIG. 11 is a diagram showing an example of a snow-hardening device using a low Curie point material.

FIG. 12 is a view showing another embodiment of the snow-hardening device using a low Curie point material.

FIG. 13 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

1A, 1B; conductors 2, 21, 22, 22 ... 2n; loose spacers 3; fixed gripping parts 4; loose gripping parts 5, 8, 10, 11, 12, 17, 20, 21; snow-diffusing device 12, 17 , 20, 21: Heating element

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Yanagisawa 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (2)

[Claims] 1. A plurality of loose spacers having loose gripping portions for gripping conductors loosely are attached to a multi-conductor power transmission line so that each loose gripping portion grips the same conductor of multiple conductors, and the loose gripping portions grip the conductors. A method for preventing galloping of a multi-conductor transmission line, characterized in that a snow-diffusing device is attached to the conductor on the side of the ground. 2. A multiconductor transmission line having at least one loose spacer having a loose gripping portion for gripping a conductor, wherein at least the conductor gripped by the loose gripping portion generates heat by a current of the conductor. A method for preventing galloping of a multi-conductor transmission line, which is characterized in that: