JP2978000B2 - Method for preventing galloping of multi-conductor transmission line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In order to prevent galloping of a multi-conductor power transmission line, a spacer constructed so as to loosely grip a conductor is used. A number of spacers, which are gripped and the other fixed electric wire gripping part is fixed to the electric wire, are attached to the transmission line at a predetermined interval at a predetermined interval. Actually, the conductors are arranged so as to be gripped alternately in the longitudinal direction, and a snow-resistant ring is attached to each conductor of the multiple conductors so as to suppress the occurrence of snow and galloping.
No. 2 discloses an electric wire twist prevention and galloping prevention spacer for a hard-to-attach snow wire.

[0003]

A method of preventing galloping by using a spacer as described above is a method in which one rotatable loose gripping portion of the spacer is mounted so as to be alternately positioned in the longitudinal direction of the transmission line. As a result, the torsional stiffness of each wire of the multiple conductors becomes equal, making it easier for each wire to develop icing snow of the same shape, and the lift generated when the icing snow is exposed to the wind is the main cause of galloping. The problem is that the lift is likely to be uniform and the galloping prevention effect is not sufficient. In addition, the twist angle due to the icing and snow of the electric wire becomes larger at the center of the span, while the snow-resistant ring is attached uniformly across the entire span,
It is uneconomical to match the actual situation.

An object of the present invention is to provide a method for preventing galloping of a multi-conductor transmission line, which solves the above-mentioned problems and more effectively prevents galloping of a multi-conductor transmission line to which a loose spacer is attached.

[0005]

According to the present invention, there is provided a method for preventing galloping of a multi-conductor power transmission line. (1) One end of a multi-conductor element conductor 1B is loosely held at one end.
The other elementary conductor of the multiconductor at the other end
Looses having a fixed holding portion 3 for holding and holding 1A
Each loose gripper 4 grips the same conductor 1B of the pacer 2.
So that the loose gripper 4
Ring or spiral on the conductor 1B gripped with
The method is characterized by attaching a rod.

(2) At one end, one elementary conductor 1B of a multiconductor is attached.
It has a loose gripper 4 that loosely grips and has a multi-conductor
It has a fixed gripping part 3 for fixing and gripping the other elementary conductor 1A.
The loose spacers 2 to be fixed and the loose gripping portions 4 are made of the same conductor.
1B is attached uniformly to multiple conductors so as to grip
One element conductor 1B gripped by loose gripper 4 and fixed gripping
The heating wires 2 are respectively attached to the other element conductors 1A gripped by the portion 3.
Winding the 0,21, and the Ryomoto conductors 1A, 1B with the each volume
The heating wires 20 and 21 are connected to the impedance of both element conductors.
It is a method characterized by winding so that there is no difference
You.

[0007]

By grasping and fixing the other conductor 1A fixed gripping portion 3 while gripping the loose loose grip portion 4 of the action] one conductor 1B of multi-conductor transmission line loose spacers 2, the stationary bunch lifting side it is assumed that the torsional rigidity of the conductor 1B conductors 1A and Lou's grip side are different, both conductors 1A, each wearing snow and ice of 1B will produce different shapes. The respective conductors 1A of span for the occurrence of galloping because 1B of wearing snow and ice is lift when subjected to wind becomes uneven not become prone uniform lift formic catcher b <br/> mappings Is prevented.

In general, since the spacers are attached every 30 to 50 m, if the loose spacers 2 are attached uniformly in the longitudinal direction of the transmission line, the conductor 1A on the fixed gripping portion 3 does not require the attachment of a snow-resistant 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 in a span, excessive icing and snow may occur. For this reason, the conductor 1B on the side gripped by the loose gripper 4 is hardly attached to the snow phosphorus.
Attachment rods or spiral rods prevent excessive icing and snow from occurring. If the icing snow is not excessive and small, the wind will not produce a large lift.

The snow-resistant ring (1) is attached on a conductor.
The snow that has slipped on the stranded conductor conductor surface along the groove
This prevents rotation and separates the attached snow.
To prevent the growth hypertrophy due to the rotation of Also spiral rod
Is too hard to prevent rotation of the attached snow
Even if there is a large amount of snow attached, the circumferential surface of the stranded conductor is
Can be prevented from rotating while sliding along
In this case, the growth of the growth due to the rotation of the attached snow can be prevented.

[0010] The heating wire of (2) is an alternating magnet of conductor current.
Heat due to hysteresis loss and eddy current loss
Melt the snow. Loose space
Only the element conductor 1B on the side gripped by the loose gripper 4 of the sa 2
When the heating wire 20 is wound, the impedance of the conductor 1B is increased.
Of the element conductor 1A on the side gripped by the
A difference occurs in the impedance, and as shown in FIG.
A normal spacer 18, which is not loose between the conductors 1A and 1B,
When the spacer 19 is attached,
Electric current flows through the spacers and the spacers 18 and 19 are overheated. this
The heating wire is attached to the element conductor 1B on the side that the loose gripper 4 grips.
20 and the fixed gripper 3 grips
The heating wire 21 is also wound around the elementary conductor 1A,
A and 1B are wound so that there is no difference in mutual impedance.
By attaching, the normal spacers 18 and 19 are passed through.
This prevents current from flowing and prevents overheating of the spacer.

[0011]

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 a two-conductor power transmission line laid in parallel.
A, the 1B attaching loose spacers _{2 (2 1, 2 2 ···} 2 n) in-uniform manner <br/> per 20~50m in the longitudinal direction. Reference numeral 3 denotes a fixed holding portion provided at one end of the loose spacer 2, and reference numeral 4 denotes a loose holding portion provided at the other end.

The loose spacer 2 having the fixed grip portion 3 and the loose grip portion 4 is configured as shown in, for example, a longitudinal sectional view of FIG. 3 and a transverse sectional view of FIG. As shown in the drawing, at one end of the spacer rod 2a is provided a fixed gripping portion 3 for fixing and gripping a conductor, and at the other end, a loose gripping portion 4 is provided with a hollow ring 4a and a hollow interior 4b. And conductor insertion holes 4c formed on both sides, and a conductor fixing portion 4d for fixing and holding a conductor is inserted into the hollow interior 4b, and the hollow ring 4a is rotatable with respect to the conductor fixing portion 4d. A conductor fixing portion 4d holding and holding the conductor 1B
Is configured such that the hollow ring 4a and the spacer rod 2a are rotatable about the rotation axis.

[0013] and wherein the stationary gripping part fixed gripped conductors 1A at 3, conductor 1B held by the rotatable loose loose grip portion 4 without being fixed, together with a plane perpendicular to the conductor axis It becomes mutually rotatable about the other hand as a rotation axis. Thus the stationary gripping part side conductors 1A and Lou's bunch
Wearing snow and ice of the torsional stiffness different from the Do Ri each power <br/> line of lifting side conductors 1B produces different shapes, uniform lift generating the galloping when this wearing snow and ice has the wind Galloping is prevented without a significant lift.

[0014] multiple conductor transmission lines equipped with loose spacers 2 as described above, the conductor 1B of the loose grip portion side, in FIG. 1
Attach the snow resistant ring 5 at a predetermined interval as shown.
Or a spiral rod 9 is wound as shown in FIG.
I can. The flame snow adhering ring 5, a going around the conductor under side while sliding conductor circumferential surface one after another more along the groove of the snowflake S is stranded conductor surface attached one after another on the conductor as is shown in Fig 5 It blocks the snow attached to the conductor's peripheral surface and prevents the snow attached to the conductor from growing excessively.

When the snow-resistant ring 5 is attached to the wire between the spans at a certain interval in the longitudinal direction, when the twist angle of the wire is zero near the wire end support point C (FIG. 1). In the vicinity of the center of the span where the twist angle of the electric wire is large, the mounting interval is small and the wire is densely mounted before and after the loose spacer 2.

When the snow-resistant ring is attached to the electric wire, the effect of preventing galloping is increased. When mounting the loose spacers 2 in the longitudinal direction of the transmission line in-uniform manner, since in general the spacer is attached to each 30 to 50 m, stationary
The conductor 1A on the gripping side does not require the attachment of a snow-resistant device, but the conductor 1B on the loose gripping side is similar to a single conductor stretched across a span, which is not a pure single conductor. ,
A reaction force moment due to the frictional force of the loose grip 4 can be expected. Therefore closely attach the mounting distance of the flame snow accretion ring, particularly in snow accretion is likely to span the central portion development, the support point side near the attachment to the crude mounting interval of snow accretion ring
You .

With the above construction, excessive icing and snow does not occur in the conductor 1B on the loose gripping portion 4 side as compared with the conductor 1A on the fixed gripping portion 3 side, and the torsional rigidity of each conductor 1A, 1B is also reduced. It will be very different. For this reason, the shapes of the icing and snow are remarkably different, and a uniform lift which is one of the causes of galloping is not generated. Therefore, galloping hardly occurs in the entire system. In addition, by reducing the number of snow-resistant rings that are attached near the span terminals, installation work and materials can be greatly saved and rationalized, so that the economic effect is extremely large.

FIG. 6 shows a modified example in which the above-mentioned hard-to-wear ring is designed to also prevent wind noise.
A pair of the snow-resistant rings 6a and 6b are
At both ends on the separated diameter line, they are connected by bars 7, 7 (only one bar 7 is shown in the figure, but there is also a bar 7 on the diameter line on the opposite side of the conductor not shown) to also prevent wind noise. The hard-to-wear snow ring 8 is formed. The snow-resistant ring 8 configured as described above is also mounted on the conductor 1B in the same manner as the snow-resistant ring 5 of the embodiment shown in FIG. This prevents the conductor peripheral surface from wrapping around the lower surface along the twisted groove and prevents the snow attached to the electric wires from growing excessively.

The embodiment shown in FIG.
In this embodiment, a short preformed spiral rod 9 is mounted as a snow-resistant device to be attached to the conductor 1B held by the loose holding portion 4 in place of the snow-resistant ring as in the above embodiment. is there. The spiral rod 9 winds the spiral rod 9s from S and the spiral rod 9z from Z alternately around the elementary conductor 1B. this
Spiral rods make it difficult for snow to adhere to conductors
A large amount of attached snow is insufficient to prevent rotation of the attached snow.
In addition, it rotates while sliding along the groove more around the stranded conductor
Growth, due to the rotation of attached snow
prevent.

In the embodiment shown in FIG. 7, instead of winding the spiral rod from S and the spiral rod from Z around the conductor 1B as described above, a spiral rod opposite to the direction in which the conductor 1B is twisted is used. 10 is an embodiment in which 10 is wound. Any of the spiral rod wound conductor, as shown in FIGS. 2 and 7 above, wraps around the lower surface side while sliding conductor circumference along the further grooves of the deposited snowflake stranded conductor surface electric line This can prevent the snow attached to the electric wire from growing excessively.

The embodiment shown in Figure 8, said snow accretion phosphorus
Conductor 1B in combination with the spiral rod 11 than grayed and S
This is applied to the case where the conductor 1B has a smooth surface as shown in the end view of FIG. In the case of this smooth conductor, there is no groove on the surface, so the attached snowflakes rotate on the smooth peripheral surface of the conductor in either direction.
And, since only snow accretion ring can not proof instrument development hypertrophy snow accretion to prevent rotation of the biasing snow accretion, disruption of wearing snowflakes performed in flame-snow accretion ring 5, what snowflakes along the conductor surface The rotation is prevented by the spiral rod 11, so that an effect equivalent to the case where a snow-resistant ring is attached to a conductor having a groove on the conductor surface is obtained.

[0022] Figure 10, Ri embodiment der of mounting the snow accretion ring 12 made of low Curie point material in the conductor 1B, flame accretion ring 12 made of low Curie point material of this in the vicinity 0 ℃ the electrically
To an alternating magnetic field to the body current is generated by the current is also a small current
Sufficient heat is generated due to hysteresis loss and eddy current loss.
And snow melting the snow accretion Te, since no heat is when a high temperature, can be expected early in snow accretion development prevention effect of snow deposited.

[0023] Figure 11, the steel of the low Curie point material shows an embodiment of a snow accretion ring 12, two split rings 13a made of pure iron based sintered body, respectively on the inner side of 13b is provided with grooves 14 A low Curie point material 15 is buried in the groove 14, and the halved rings 13a and 13b are attached by a ring spring 16 on the outer periphery with the conductor interposed therebetween. 1
Numeral 7 denotes an elastic piece, which is used as necessary to enhance the fixing effect of the split rings 13a and 13b.

FIG. 12 is closely wound in the of snow accretion-ring made of a low Curie point material, wire galvanized low Curie point material, low Curie point streak 17 which has been subjected to aluminum coating, etc.
The wire 17 is formed on the conductor 1B at appropriate intervals .
A continuous manner wound embodiments, in this embodiment streak 1
Since the wire 7 can be automatically wound around the conductor 1B by the wire winding machine, it is efficient. Alternating magnetic field thus low Curie point streak 17 Yoko was wrapped conductor 1B conductor current
Heat is generated at the point and melts the snow on the conductor.

[0025] Figures 1 to 3, both conductors 1A of multi-conductor transmission line, 1
B to attach preparative the loose spacer 2, the two conductors 1
A and 1B show the hysteresis due to the alternating magnetic field of the conductor current.
Heating wires 20 and 21 that generate heat due to heat loss and eddy current loss are wound
A digitizing embodiment will be described. This heating wire is made of, for example, a Ni-Fe alloy (mainly Ni, the balance being Fe, a small amount of Mn,
Cr, using heating filament made of a magnetic metal wire material including Al or the like), is wound in the opposite direction or same direction as the more direction outer periphery of the outermost layer of which the conductors. Heating of the heating wire conductors
It melts the snow accumulation.

The heat-generating wire of the magnetic metal wire made of the above-mentioned Ni-Fe alloy has a high relative magnetic permeability even when the current flowing through the conductor is small, so that it can generate heat to a temperature at which snow can be melted. Also, even if the current flowing through the conductor is large, the magnetic saturation is quick and the amount of heat generation is small, so that the conductor temperature does not transiently increase. The heating wire may have any shape such as a round wire, a flat wire, or a tape shape. By preforming in a spiral shape in advance, the heating wire can be easily mounted on an already installed overhead transmission line.

As described above, when the heating wire 20 of the magnetic metal wire is wound over the conductor 1B on the loose gripping portion gripping side of the loose spacer 2 over a certain length, the impedance of the conductor 1B increases, and the other fixed gripping portion side It will be different from the impedance of the conductor 1A. When the impedance of the two conductors 1A and 1B is different from each other, as shown in FIG.
When the spacers 8 and 19 are mounted, the spacers 18 and
As shown by a chain line in FIG. 13 through 19, a current flows, and the spacers 18 and 19 are overheated. In order to cope with this, the heating wire 2 is also provided at the portion of the fixed gripper side conductor 1A opposite to the portion of the conductor 1B around which the heating wire 20 is wound.
1 and this winding is performed so that there is no difference in impedance between the conductors 1A and 1B .
This prevents current from flowing through the spacers 18 and 19 to prevent overheating.

[0028]

As described above, according to the method for preventing galloping of a multi-conductor power transmission line of the present invention, one conductor of a multi-conductor power transmission line is loosely gripped by a loose grip portion of a loose spacer, and the other conductor is fixedly gripped. Since a snow-repelling ring or a spiral rod is attached to the conductor on the loose grip side, even if a large amount of snow adheres, the wire conductor circumferential surface is rotated.
This can prevent the development of excessive icing snow due to attached snow , and furthermore, the torsional stiffness of the conductor on the fixed gripping side and the conductor on the loose gripping side can be made different so that Since the conductors are formed in a shape, the lift of the icing snow of each conductor when the wind is received can be made uneven, so that the galloping prevention effect is remarkable.

By winding a heating wire around the conductor,
Prevents excessive snow accretion by generating heat with the alternating magnetic field of electric current and melting snow
This heating wire can be wound around the loose spacer.
Not only the loose conductor on the loose grip but also the other fixed grip
Around the conductors, and the mutual impedance of both conductors
Wound so that there is no difference in dance
Even if a normal spacer is attached to the body,
Prevents current from flowing through the
Can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing one 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 one embodiment of the loose spacer.

FIG. 5 is a diagram showing an installation state of one embodiment of the snow-resistant ring .

FIG. 6 is a view showing an installation state of another embodiment of the snow-resistant ring .

FIG. 7 is a mounting state diagram of the embodiment of the cospiral rod .

FIG. 8 is a view showing an installation state of a snow-resistant ring and a spiral rod .

FIG. 9 is an enlarged end view of the conductor shown in FIG. 8;

FIG. 10 is a mounting state diagram of an embodiment of a hard-to-wear snow ring using a low Curie point material.

FIG. 11 is a view showing one embodiment of a hard-to-wear ring using a low Curie point material.

FIG. 12 is a view showing another embodiment of a hard-to-wear snow ring using a low Curie point material.

FIG. 13 is a diagram showing an embodiment in which a heating wire is wound around both conductors .

[Explanation of symbols]

1A, 1B; conductors 2, 21, 22,... 2n; loose spacers 3: fixed grips 4, loose grips 5, 8, 12, 17; snow-resistant rings 9, 10, 11; spiral rods 20, 21 : Heating wire

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takeshi Yanagisawa 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (56) References JP-A-64-8814 (JP, A) JP-A Sho JP-A-1-114322 (JP, A) JP-A-2-254916 (JP, A) JP-A-50-68892 (JP, U) JP-A-50-55590 (JP, A) U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H02G 7/00-7/22

Claims (2)

(57) [Claims] 1. One end of a multiconductor is loosely grasped at one end.
The other elementary conductor of the multiconductor at the other end with a loose grip
Spacer with a fixed gripper for holding and gripping
The multiple conductors so that each loose gripper grips the same conductor.
To the side gripped by the loose gripper.
A method for preventing galloping of a multi-conductor power transmission line, wherein a snow-resistant ring or a spiral rod is attached to a conductor. 2. One end of a multiconductor is loosely grasped at one end.
The other elementary conductor of the multiconductor at the other end with a loose grip
Spacer with a fixed gripper for holding and gripping
The multiple conductors so that each loose gripper grips the same conductor.
One at a time, and gripped by the loose gripper
And the other conductor gripped by the fixed gripper
Around the heating wire, and each wound heating wire of the two elemental conductors,
Wound so that there is no difference in impedance between the two conductors
Galloping method for preventing the conductor transmission line, characterized in that the kick.