KR20110064513A - Method of construction for area along power line in the overhead transmitting line using block for overhead transmitting line - Google Patents

Method of construction for area along power line in the overhead transmitting line using block for overhead transmitting line Download PDF

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Publication number
KR20110064513A
KR20110064513A KR1020090121166A KR20090121166A KR20110064513A KR 20110064513 A KR20110064513 A KR 20110064513A KR 1020090121166 A KR1020090121166 A KR 1020090121166A KR 20090121166 A KR20090121166 A KR 20090121166A KR 20110064513 A KR20110064513 A KR 20110064513A
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KR
South Korea
Prior art keywords
power line
wheels
line
pulley
overhead
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KR1020090121166A
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Korean (ko)
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이병준
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이병준
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Priority to KR1020090121166A priority Critical patent/KR20110064513A/en
Publication of KR20110064513A publication Critical patent/KR20110064513A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • H02G7/02—Devices for adjusting or maintaining mechanical tension, e.g. take-up device

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  • Suspension Of Electric Lines Or Cables (AREA)

Abstract

The present invention relates to an overhead power line construction method for overhead transmission line using a pulley for overhead transmission line, wherein at least two wheels are arranged to be in contact with the power line and rotatable in a traveling direction of the power line, and the load of the power line is The overhead transmission line includes flow members connected to the wheels so that the wheels are retracted according to the degree of the load when applied to each wheel and the wheels are returned to their original state when the load is not applied to the wheels. When the load is applied to each of the wheels using a pulley, the wheels support the power line while maintaining a bending angle of the power line by the flow members while simultaneously distributing the tension applied to the power line. It is characterized by the overhead line construction method of overhead transmission line.

Description

Method of construction for area along power line in the overhead transmitting line using block for overhead transmitting line}

The present invention relates to a method for twisting a overhead power line using a pulley for a overhead transmission line. The present invention has been applied to a stranded construction by directly applying the "treadmill for overhead transmission line" filed by the applicant to the stranded wire line. By adjusting fluidly, it prevents swelling of power line and deterioration of power line, and prevents bird cage phenomenon (Bird Cage, also called Wara) that occurs frequently during construction, and prevents disconnection or trip after construction. The present invention relates to a power line twisted-line method of a overhead transmission line using a pulley for a overhead transmission line, which can prevent and minimize safety maintenance costs.

In general, in the construction of overhead transmission line pylon construction, the twisted pair construction refers to a task of connecting a power line between each pylon and a pylon.

The twisted pair construction is to wire the overhead line and power lines to the steel tower following the assembly construction, which corresponds to the construction before the longline work. Stranded construction can be divided into stranded wire, stranded stranded wire and stranded wire of power line.

There are two methods of twisted pair of wire strands and helicopter stranded strands.The twisted pair of overhead line and power line can be divided into line changing method, no line changing method, and little difference method. One-line and two-line drag methods are mainly used for the method without line change.

Each method should be selected and used appropriately depending on the conditions of the site, and several methods may be used in combination.

The stranded constructions mentioned above commonly use the pulley 9 as shown in FIG. 1.

The pulley 9 is installed to rotate about a guide 1, a center axis 2, and a center axis 2 in a vertical state, and a groove 4 at an edge so that the power line R can pass through the edge. It consists of the wheel 5 in which it is formed.

The utilization and operation of the pulley 9 having such a configuration is to insert one side of a ring (not shown) into the hole 6 formed in the upper part of the guide 1 during the construction of the overhead transmission line, and then replace the other side of the ring. After the trolley 9 is fixed to the steel tower T by connecting to the pylon (see reference numeral 'T' in Fig. 2), the wheel 5 of the fixed pulley 9 can support the power line R. To be able.

When the power line R supported by the wheels 5 of the pulley 9 is pulled from the drum long stranded car 7 side to the engine long stranded car 8 side as shown in FIG. 2, the pulley 9 The wheel 5 rotates in the direction of travel of the power line R (indicated by the arrow in Fig. 2).

However, when applying this type of pulley 9 to the current twisted pair construction, there were serious problems as follows.

In general, in the power line R, aluminum cable steel reinforced (ACSR) is arranged in a helical manner in which a plurality of aluminum wires are helically arranged at the edge of the core of the steel core.

This type of power line R passes through a conventional pulley 9, i.e., a pulley in which the tension and angle of the power line R cannot be flexibly adjusted during the twisted line operation, and the power line R causes the wheels of the pulley 9. In continuous contact with (5), the exaggerated force is generated in the aluminum wire of the power line (R) in contact with the wheel (5) at the moment of contact with the power line (R) and the wheel (5) of the pulley (9). This process is repeatedly performed during the twisted pair.

In particular, in the case of twisted pair in FIG. 2, the drum length of the drum (Tensioner: 7) iron tower (X), medium angle pylon (Y: horizontal angle of 30 degrees or more C-type tower, E-type tower, D-type tower), and the engine Fuller: 8 In the pylon (Z) there was a problem that the exaggeration of the power line (R) is more severely generated. It is preferable that the lifting angle from the drum long stranded car 7 to the steel tower X is about 5 degrees. However, this is difficult to secure a necessary space for the lifting angle due to the on-site conditions of the conventional pulley 9 and obstructs the feature. Due to this, it is very difficult to secure the pulling angle, so the exaggeration of the power line (R) occurred particularly badly.

In addition, during the twisted pair operation, the power line R and the wire rope (not shown) connecting and connecting the power line R continuously contact each other, and the power line R and the wire rope rotate each other and collide with each other. Tensile force of the strong wire rope is transmitted directly to the aluminum wires of the power line (R).

As shown in FIGS. 3A to 3D due to the force applied to the power line R as described above, an swelling phenomenon occurs in the aluminum element wire of the power line R, and in some cases, a bird cage phenomenon occurs. . Furthermore, after compression human clamp (not shown) compression occurred even when the outer layer aluminum wires protrude.

For reference, Figure 3a is a picture showing the swelling phenomenon occurring in the twisted pair, Figures 3b and 3c is a picture showing the swelling of the wire after the long line, Figure 3d is a power line passing through the conventional pulley showing the appearance of damaged It is a photograph.

Power line (R) is a passage through which ultra high voltage currents such as 154kV, 345kV, and 765kV pass, so when a bird cage phenomenon occurs in power line (R), foreign matter penetrates into the gap between the aluminum wires, and the construction of transmission line is completed. After disconnection or trip accidents frequently occur, not only a lot of expenses are required to maintain the power line, but also there is a problem that the safety is weak, and the quality of the transmission line equipment is extremely poor.

 In recent years, in order to reduce the bird cage phenomenon of power lines in twisted pairs, an improved pulley is applied to the mid-angle steel tower, but it is not only complicated to install, but also heavy to 300-900 kg, making it difficult to apply to the steel tower. There was a problem that is not used in the real estate.

In addition, there is a problem that the power line is damaged by an unbalanced tension applied to the power line passing through the pulley even in a section in which the elevation difference between the front and the rear tower is 20 degrees or more.

The present invention has been made to solve the above problems, by applying the same "applicable pulley for processing transmission line" applied by the applicant directly to the twisted pair construction by flexibly adjusting the tension and angle of the power line, swelling of the power line And prevents the deterioration of the power line and prevents the bird cage phenomenon (Bird Cage (also called Wara)), which frequently occurs during construction, to prevent breakage or tripping after construction, and the maintenance cost of the power line. The purpose of the present invention is to provide a twisted-pair method for overhead power lines using overhead pulleys for overhead transmission lines to minimize safety and to ensure safety.

In addition, the present invention can be used more systematically in the construction site, and an object of the present invention is to provide a power transmission line construction method for overhead transmission line using a pulley for overhead transmission line that can secure a safe construction and high quality at the same time.

In addition, the present invention provides a power transmission line twisting method using a transmission transmission line using a pulley for overhead transmission line that can be practically utilized in the field by linking and systemizing the relevant uses of the tools currently used in the field to each other effectively. The purpose is.

According to an aspect of the present invention for achieving the above object, as an overhead transmission line power line construction method using a pulley, at least two wheels arranged to be in contact with the power line and rotatable in the advancing direction of the power line, and When the load of the power line is applied to each of the wheels, each of the wheels are contracted according to the degree of the load and at the same time when the load is not applied to the wheels the moving members connected to the wheels respectively so that the wheels return to the original When the load is applied to each of the wheels using a pulley for a overhead transmission line, the wheels support the power line while maintaining the bending angle of the power line by the flow members while being applied to the power line. Special feature is the twisted pair method of overhead power line for distributing losing tension. It is gong.

The pulley is characterized in that it is used in all the iron towers of the drum long stranded car, the mid-angle steel tower, the front and rear of the iron tower is severe, the imbalance of tension applied to the electric wire in the twisted pair and the engine long stranded car.

The medium angle pylon is a steel tower having a horizontal angle of 30 degrees or more.

The present invention is applied by the applicant of the same application "tract pulley for processing transmission line" directly to the twisted pair construction work by flexibly adjusting the tension and angle of the power line according to the load of the power line during the twisted pair work so that the power line can form an obtuse angle By operating, the bending angle of the power line can be kept smooth and the tension applied to the power line can be dispersed.

As a result, by preventing the exaggeration of the power line, there is an excellent effect that can prevent the power line swelling, further deterioration of the power line, and at the same time prevent the bird cage phenomenon.

In addition, it can be used effectively at the point where the exaggeration of the power line is severely generated, especially in the drum long stranded car tower, the middle angle steel tower, and the engine long stranded car tower. It has an excellent effect to secure safe construction and good quality at the same time.

The present invention has the advantage that can be practically utilized in the field by linking and systemizing so as to effectively use each other's relevant applications (having compatibility with existing pulleys) currently used in the field.

In addition, the present invention has the effect that the power line is not damaged by adjusting the tension applied to the power line passing through the pulley even in a section in which the elevation difference between the front and rear towers is more than 20 degrees.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the overhead power line twisted-line method of the overhead transmission line using the pulley for overhead transmission line according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the power line twisted-line method of the overhead transmission line using the pulley for overhead transmission line according to the present invention.

Figure 4 is a front view of the pulley for overhead transmission line according to the present invention, Figure 5 is an operational state diagram showing the operation of the pulley for overhead transmission line according to the present invention, Figure 6 is a wheel of the pulley for overhead transmission line according to the present invention. A side view showing some.

As shown in Figure 4 and 5, the pulley 10 for the overhead transmission line according to the present invention is to use for the power line (R) twisted wire work in the construction of the tower, at least two or more wheels (20, 30, 40) ), And the flow members (50, 60, 70).

First, the wheels 20, 30, 40 are arranged to be in contact with the power line (R) and at the same time rotatable in the traveling direction of the power line (R) (see 'arrow' in Figure 5).

These wheels 20, 30, 40 are the first wheel 20, the second wheel 30, and the third wheel 40 are arranged in a line in the direction of the twisted pair of the power line (R). First to third shafts 21, 31, and 41 are positioned at the center points of the first to third wheels 20, 30, and 40, respectively.

When the pulley 10 is viewed from the front, the first wheel 20 has a larger width than the second and third wheels 20 and 30, and the second and third wheels 20 and 30 have a first width. The wheels 20 are positioned at both edges, respectively.

When the first to third wheels 20, 30, and 40 support the power line R, the supported power line R is configured to support the second and third wheels 30 and 40 around the first wheel 20. It is preferable to form an obtuse angle toward the) side.

This is to maintain the bending angle of the power line (R) smoothly and to disperse the tension applied to the power line (R), and to prevent the exaggeration of the power line (R), thereby swelling the power line (R) Further, there is an effect that can prevent the degradation of the power line (R) and at the same time prevent the bird cage phenomenon.

The wheels 20, 30, and 40 may be made of a material that is softer than the power line R, or may have a layer of flexible material 100 (see FIG. 6) on a surface in contact with the power line R.

Since the aluminum wires of the power line R are not much higher in strength, the wheels 20, 30 and 40 are formed of a softer material than the aluminum wires or the flexible material is formed on the outer circumferential surface of the wheels 20, 30 and 40. If the layer 100 is formed, the power line R can be more effectively protected without being damaged.

As the flexible material, flexible plastic, urethane, rubber, or the like can be used.

When the load of the power line (R) is applied to the wheels 20, 30, 40, the flow members (50, 60, 70), each of the wheels (20, 30, 40) to the load of the power line (R) At the same time, when the load is not applied to the wheels 20, 30, 40, the wheels 20, 30, 40 are connected to the wheels 20, 30, 40 so that the wheels 20, 30, 40 are returned to their original positions.

These flow members 50, 60, 70 are configured to cooperate with the respective axes 21, 31, 41 of the wheels 20, 30, 40.

When a load of the power line R is applied to each of the wheels 20, 30, and 40, the flow members 50, 60, and 70 move together with the wheels 50, 60, 70 to determine the bending angle of the power line R. The tension applied to the power line R can be efficiently distributed while keeping it smooth.

The flow members (50, 60, 70) is capable of contraction and expansion together with the wheels (20, 30, 40), preferably composed of at least one of an elastic member, a hydraulic cylinder, and a pneumatic cylinder.

As shown in Figures 4 and 5, the flow member (50, 60, 70) is composed of the first to third flow member (50, 60, 70).

The first flow member 50 is made of a spring. However, the first flow member 50 may be made of a hydraulic or pneumatic cylinder.

The first flow member 50 supports the first shaft 21 of the first wheel 20, and the first flow member 50 when the load of the power line R is applied to the first wheel 20. Is contracted, and when no load is applied to the first wheel 20, the first flow member 50 returns to its original state by the elastic force of the spring.

The second and third flow members 60, 70 are made of hydraulic cylinders. However, the second and third flow members 60 and 70 may be made of a spring or a pneumatic cylinder.

The second and third flow members 60 and 70 support the second shaft 31 of the second wheel 30 and the third shaft 41 of the third wheel 40, respectively, and the power line R Is applied to the second and third wheels 30 and 40, the second and third flow members 60 and 70 contract and the load is not applied to the second and third wheels 30 and 40. If not, the second and third flow members (60, 70) are returned to normal by hydraulic pressure.

The pulley 10 further includes frame groups 80, 90, and 91 for mechanically connecting the first to third wheels 20, 30, and 40 to each other.

As shown in FIG. 4 and FIG. 5, the frame group 80, 90, 91 includes a center frame 80 and two edge frames 90, 91.

The center frame 80 includes a first flow member 50 connected to the first shaft 21 and interlocked with the first shaft 21 so that the first wheel 20 is rotatable. The center frame 80 is formed perpendicular to the ground.

The edge frames 90 and 91 are installed at both sides with respect to the center frame 80 so as to prevent the outside of the power line R, and are hinged so as to be rotatable from the center frame 80. The second shaft 31 of the wheel 30 and the third shaft 41 of the third wheel 40 are pivotally connected to each other. The edge frames 90 and 91 are formed to be horizontal with one side and the other side with respect to the center frame 80.

The center frame 80 and the second shaft 31 and the center frame 80 and the third shaft 41 are rotatably connected with the second flow member 60 and the third flow member 70 in a predetermined radius. do.

And the center frame 80 has a hole 110 for the purpose of connecting through the pylon (T) and the ring means (not shown) at the top.

Operation and utilization of the pulley 10 is as shown in FIG.

First, before the start of the twisted pair work, the drum long stranded car pylon (X), the middle angle pylon (Y: horizontal angle of 30 degrees or more C-type tower, E-type tower, D-type pylon), and the engine-length stranded car This pulley 10 is installed in (Z).

The center frame 80 of the pulley 10 can be installed in the above-described steel towers X, Y, and Z by inserting a ring means into the hole 110 formed at the top. In addition to the above-described pylons (X, Y, Z), it is possible to apply a conventional pulley (see reference numeral '9' in FIG. 1). You can also apply

Subsequently, a twisted pair operation for twisting the power line R to the drum long stranded car 7, the steel towers X, Y, Z, T, and the engine long stranded car 8 is performed.

As shown in FIG. 5, when the pulley 10 is viewed from the front, the first to third wheels 20, 30, and 40 support the power line R, and the first to third wheels 20, As the 30, 40 are subjected to the load of the power line (R), each of the flow members (50, 60, 70) is contracted according to the load of the power line (R). As a result, the supported power line R may form an obtuse angle toward the second and third wheels 30 and 40 with respect to the first wheel 20.

As the pulley 10 operates as described above, the power line R operates at an obtuse angle, thereby maintaining the bending angle of the power line R smoothly and at the same time distributing the tension applied to the power line R. By preventing the exaggeration of the force applied to R), it is possible to prevent the swelling of the power line R (see Fig. 3) and further reduce the quality of the power line R and at the same time prevent the bird cage phenomenon. It works.

On the other hand, when no load is applied to the wheels 20, 30 and 40, the flow members 50, 60 and 70 return to their original positions, and the wheels 20, 30 and 40 also return to their original positions.

As described above, the pulley 10 includes, in particular, a drum-long twisted pair train tower (X), a medium-angle steel tower (Y), and an engine-length stranded truck, in which the exaggeration force of the power line (R) has been excessively conventionally generated. It can be used efficiently in the train tower (Z), and the installation is simple because the configuration is simple and the load (less than 80kg) is light, so it can be installed in the same way as a conventional pulley without any special equipment. There is an effect that can replace the conventional pulley in the twisted pair operation without significantly changing the working process.

In addition, there is an effect of preventing the power line from being damaged by adjusting the tension applied to the power line through which the pulley passes, even in a section where the elevation difference between the front and the rear towers is 20 degrees or more.

8 is a block diagram illustrating a method for twisting a overhead transmission line power line using a pulley for a overhead transmission line according to the present invention. This embodiment shows an example of carrying out a "method of twisting a wire by a helicopter" among the "wire twisted wire method". However, in addition to this method, it is possible to use sufficiently in the "wire twisting method" among "wire twisting method".

This helicopter twisted pair construction method, as shown in Figure 8, first performs a twisted pair preparation step (S1), such as the request for cooperation with local residents, winding the rope in the twister, installing guide rods, and pulleys. At this time, the pulley is the pulley mentioned above, and the installation of the pulley is preferably performed in a drum long stranded car tower X, a mid-angle steel tower Y, and an engine long stranded steel tower Z. If necessary, it may be installed on the entire steel tower.

After that, the helicopter consultation with the twisted pair (S2) and the investigation flight (S3) to attach the twisted pair to the helicopter (S4).

Next, after moving to the start of the twisted pair (S5), the sand bag is dropped (S6) and the rope is ground fixed (S7).

Pass the pylon while hanging the ropes to each pylon (S8) and if the rope is fixed to the rope fixed tower (S9) (S10) past the final pylon (S11) to lower the remaining rope to the ground (S12). However, if the rope was not tied to the rope fixing tower (S9) (S10) and performs the step (S8) to pass through the pylon while hanging the rope to each pylon again in the final pylon (S11).

After the remaining rope is lowered to the ground (S12), the rope is fixed to the ground (S13), the helicopter returns (S14) and the helicopter stranding is completed (S15). After the wire replacement (S16) and the wire line is subjected to the process (S17).

After the helicopter twisted pair process, the twisted pair process as shown in FIG. 9 is additionally performed.

This embodiment is a case of a pair of overhead lines and two turns of power line conductors in the line replacement method (two-line drag). However, the present method can be sufficiently applied to the three-line drag method of the line replacement method or the one-line drag and two-line drag method of the method without line change.

This method, first, after the twisted wire (two sets of upper arm 2mm 9mm) is finished (S20), the wire change (9mm-> 16mm) process (S21), and then the overhead line and 1L side upper arm power line twisted ( S22). At this time, three strands of one wire are made (processing wire + 1L side upper arm power line + 1L side arm stranded messenger wire).

Thereafter, the 2L side upper arm power line is twisted (S23). At this time, two strands of 1 wire are made (2L side upper arm power line + 2L side arm twisted pair messenger wire).

The middle and lower arm power lines of the 1L side are twisted (S24). At this time, two strands of 1 wire are made (middle and lower arm power lines of 1L side).

After the above step, the middle and lower arm power line 2L side twisted line (S25). At this time, one set of two stranded wire (2L side middle and lower arm power line).

After the twisted pair is finally completed (S26).

Since this method uses the pulley as described above, it maintains the bending angle of the power line smoothly by operating the power line to form an obtuse angle by flexibly adjusting the tension and angle of the power line according to the load of the power line. At the same time, there is an effect that the tension applied to the power line can be dispersed.

This prevents the exaggeration applied to the power line during the twisted wire operation, thereby preventing the power line from swelling, and further reducing the quality of the power line, and at the same time can prevent the bird cage phenomenon in advance.

In addition, it can be used effectively at the point where the exaggeration of the power line is severely generated, especially in the drum long stranded car tower, the middle angle steel tower, and the engine long stranded car tower. It has an excellent effect to secure safe construction and good quality at the same time.

The present invention has the advantage that can be practically utilized in the field by linking and systemizing so as to effectively use each other's relevant applications (having compatibility with existing pulleys) currently used in the field.

In addition, the present invention can reduce the tension applied to the steel tower to prevent the damage of the steel tower, that is, the member of the steel tower bent or collapsed in advance.

1 is a front view of a pulley according to the prior art,

Figure 2 is a schematic diagram showing a twisted pair method in the overhead transmission line construction according to the prior art,

3a to 3c are photographs showing the swelling phenomenon of the power line, Figure 3d is a photograph showing the appearance of the power line damaged while passing through the conventional pulley,

4 is a front view of a pulley for a overhead transmission line used in the present invention,

5 is an operation state diagram showing the operation of the pulley for overhead transmission line used in the present invention,

Figure 6 is a side view showing a part of the wheel of the pulley for overhead transmission line used in the present invention,

7 is a schematic diagram illustrating a method for twisting a overhead transmission line power line using a pulley for a overhead transmission line according to the present invention;

8 and 9 are block diagrams illustrating a method for twisting a overhead transmission line power line using a pulley for a overhead transmission line according to the present invention.

Explanation of symbols on main parts of drawing

X: All steel towers of the drum yard, Y: Medium angle steel tower

Z: Stroller in the engine field

20: first wheel 21: first axis

30: second wheel 31: second axis

40: third wheel 41: third axis

50: first flow member 60: second flow member

70 third flow member 80 center frame

90, 91: edge frame 100: soft material layer

110: hole

Claims (3)

As a method for twisting a overhead power line using a pulley, At least two or more wheels arranged to be in contact with the power line and rotatable in a traveling direction of the power line, and when the load of the power line is applied to the wheels, the wheels are contracted according to the degree of the load and simultaneously When no load is applied to the wheels, the wheels are connected to the power line when the load is applied to each of the wheels using a pulley for a overhead transmission line including flow members respectively connected to the wheels so that the wheels are returned to their original positions. And maintaining the bending angle of the power line by the flow members while dispersing the tension applied to the power line. The method of claim 1, The pulley is a construction method characterized in that it is used in the all-steel tower, the middle angle steel tower, and the all-steel tower of the engine long stranded vehicle when the stranded ship. 3. The method of claim 2, The medium angle pylon is a construction method characterized in that the steel tower with a horizontal angle of 30 degrees or more.
KR1020090121166A 2009-12-08 2009-12-08 Method of construction for area along power line in the overhead transmitting line using block for overhead transmitting line KR20110064513A (en)

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KR1020090121166A KR20110064513A (en) 2009-12-08 2009-12-08 Method of construction for area along power line in the overhead transmitting line using block for overhead transmitting line

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KR1020090121166A KR20110064513A (en) 2009-12-08 2009-12-08 Method of construction for area along power line in the overhead transmitting line using block for overhead transmitting line

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101871051B1 (en) * 2016-09-21 2018-06-25 한국전력공사 Pully and wire tension monitoring system using that
KR101894525B1 (en) 2018-03-05 2018-09-04 (주)미동이엔씨 Method of construction a helicopter transmission using pulley for auto-inserting overrhead transmission line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101871051B1 (en) * 2016-09-21 2018-06-25 한국전력공사 Pully and wire tension monitoring system using that
KR101894525B1 (en) 2018-03-05 2018-09-04 (주)미동이엔씨 Method of construction a helicopter transmission using pulley for auto-inserting overrhead transmission line

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