JP2000350343A - Hanging jumper device for multiconductor transmission line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To employ a prefabricated overhead line installation method when a wire anchoring method with a wedged clamp and a hanging jumper device are employed. SOLUTION: In a hanging jumper device 21 for a multiconductor transmission line, the multiconductor transmission lines 2 are anchored by the arm 4 of a strain tower on both the sides of the arm 4 with wedged clamps 12, yokes 6 and tension insulator strings 5, the center parts except both the sides of jumper wires 3 formed between both the wedged clamps 12 on both the sides of the tower are laid horizontally along a rigid horizontal member 8 hung by the yoke 6 with support members 9 therebetween, and the jumper wires 3 are supported by spacers 11 arranged on the rigid horizontal member 8 with intervals. Parts of the free parts 3b of the jumper wires 3 are used as excessive length parts which are bent into a U-shape with a size within a range containable in the inner space of a group of a plurality of jumpers 3 to absorb excessive lengths.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension type jumper device in which an intermediate portion except for both side portions of a jumper wire is attached to a rigid horizontal member. With regard to the suspension type jumper device applied to the type to be retained on the tension tower, particularly when manufacturing the electric wire, the electric wire in the section of one extension line is measured and marked to the length determined and precisely measured and calculated in advance. The present invention relates to a suspended jumper device for a multi-conductor power transmission line suitable for a prefabricated wire-line construction method in which a prefabricated wire is used.

[0002]

2. Description of the Related Art A suspended jumper device 7 as shown in FIG. 5 is conventionally known as a jumper device in a tension portion of an ultra-high voltage overhead transmission line. In the figure, reference numeral 1 denotes a multi-conductor power transmission line, 2 denotes a span portion (span wire), and 3 denotes a jumper portion (jumper wire). Reference numeral 4 denotes a tower arm, reference numeral 5 denotes a tension insulator series, and reference numeral 6 denotes a yoke located on the span side of the tension insulator series 5.

[0003] The suspended jumper device 7 includes a rigid horizontal member 8 made of a rigid shaped steel material or a steel pipe material in order to minimize the clearance required for electrical insulation between the jumper wire 3 and the tower arm 4. It is horizontally arranged below the arm 4, both ends of which are hung on the yoke 6 via the support member 9, and spacers 11 for holding the jumper wire 3 are attached to both ends and an intermediate portion of the rigid horizontal member 8 at intervals. The middle portion of the jumper wire 3 except for both side portions is attached to the rigid horizontal member 8 by the spacer 11. The jumper wire 3 in the suspended jumper device 7 is a portion between the jumper outlets (arrows 13) of the wedge-shaped clamps 12 on both sides of the tower of the transmission line 1, and the jumper outlets 13 of the wedge-shaped clamps 12
The both sides of the rigid horizontal member 8 which have slack between the end and the spacer 11 are the jumper wire free portions 3a, and the intermediate portion gripped by the spacer 11 and attached to the rigid horizontal member 8 is the jumper line horizontal portion 3b. Call.

The lengths of the support member 9 and the rigid horizontal member 8 are determined by the coordinates of the yoke 6 located on the span side of the tension insulator series 5 for retaining the span electric wire 2 installed on the steel tower, the required clearance, and It is determined and calculated by calculating a jumper shape based on an angle (suspension angle) formed between the support member 9 and the rigid horizontal member 8, and the like. The support member 9 is generally provided with a length adjusting portion (not shown) for adjusting the clearance on site. For the length of the free portion 3a of the jumper wire 3, the same jumper shape calculation is performed, and the jumper outlet 13 of the wedge clamp 12 is obtained.
Then, the actual length between the spacers 11 provided at the end of the rigid horizontal member 8 is calculated, and the required number of jumper spacers is determined based on a predetermined interval between the jumper spacers 14 to manufacture.

[0005] The suspension type jumper device 7 is generally constructed in the following procedure. Connect the span wires 2 to the tension insulators 5
When securing to the wedge-type clamp 12 at the tip of the above, the required jumper wire length calculated by the above-described jumper shape calculation is calculated by adding the extra length for the construction work from both sides of the tower (younger and older). Make a deal. After the support member 9 and the rigid horizontal member 8 assembled on the ground are lifted and attached to the yoke 6, the free portion 3a of the jumper wire 3 is secured,
The remaining portion (the portion to be the jumper line horizontal portion 3b) is linearly attached to the rigid horizontal member 8 and is gripped by the spacer 11. In this case, since the extra length is expected from the beginning in the jumper wire 3 as described above, the rigid horizontal member 8 is not linearly attached as it is. Then, in order to attach the jumper wire 3 to the rigid horizontal member 8 in a straight line, the jumper wire 3 is cut between the spacers 11, formed into a straight line, and adjusted in length. Compression connection.

For the purpose of labor saving in overhead wire work, for example, in a case where a suspension tower is located at an intermediate position by an electric wire retaining system using a wedge-type clamp 12, the wedge-type clamp installation position and the suspension clamp installation position in each of the towers at the time of manufacturing the electric wire. In recent years, a prefabricated wire line method of extending a wire using a marked prefabricated electric wire has been adopted. In this case, for the prefabricated electric wire, the distance between the wire support points between the respective diameters to be overlaid is precisely measured, and the distance between the support points of the tension yoke of the tower arm, the length of the tension insulator, and the specified sag are taken into consideration.
It is manufactured by obtaining the actual wire length of one extension line section, measuring the length of the prefabricated wire to a length corresponding to the required wire actual length, and marking the wire when manufacturing the wire. Then, the prefabricated wire is extended by using the prefabricated electric wire, attaching the wedge-type clamp 12 to the prefabricated electric wire in accordance with the marking, and connecting the wedge-type clamp 12 to the tension insulator series 5. In the case of the tension tower, assuming that the suspension jumper device 7 is employed, the actual jumper wire length obtained by the jumper shape calculation as described above is added to the above-described actual wire length when manufacturing the electric wire. Then, after the wire is drawn, a tightening operation (sagging adjustment work) is performed so as to match the specified sag.
Next, the rigid horizontal member 8 and the support member 9 are lifted and attached to the yoke 6, and then the free portion 3a of the jumper wire 3 is secured, and the jumper line horizontal portion 3b is linearly attached to the rigid horizontal material 8, and the spacer 11 Hold with. This completes the function as a transmission line including the suspension type jumper device 7 which is a current path.

[0007]

However, since the purpose of the prefabricated wiring method is labor saving and cost reduction, no extra time is required for the above-mentioned construction work even in the construction of the suspended jumper device 7. It is a premise. Therefore, the jumper wire 3 between the spacers 11
Adjustment of the jumper length by cutting of the jumper and compression connection of the jumper wire 3 by the jumper sleeve 16 are not performed. However, errors are caused by factors such as errors in prefabrication calculation and prefabricated measuring rule, errors in precision surveying, errors in jumper shape calculation, errors in rotational elongation of wire and elongation of the wheel passing, and errors in execution. As described above, generally, a sag adjustment bracket 17 whose length can be adjusted by about ± 100 mm is interposed between the wedge-shaped clamp 12 and the yoke 6.
It has a structure that can absorb errors on the span side.

However, when the wedge-type clamp 12 is used, since the span wire 2 and the jumper wire 3 are continuous, the adjustment result on the span side directly affects the formation of the suspended jumper device 7. become. In addition, it is conceivable that the wedge-type clamp 12 is replaced to adjust the wedge mounting position. However, since it is necessary to minimize damage to the electric wire due to wedge driving, the number of wedge replacements is limited. . For this reason, it is necessary to absorb the error substantially only by the suspension type jumper device 7, and as a result, the free portion 3a of the jumper wire 3 becomes irregular, insufficiently loosened, excessively loosened, and the like. There is a disadvantage that a large man-hour is required.

In a general prefabricated overhead wire construction method, when determining the wire support point spacing, precise surveying is performed between all wire support points (ie, between six support points in the case of a two-circuit tower). In recent years, for the purpose of further cost reduction, adoption of a method of performing only surveying between towers at a steel tower position, that is, a method based on surveying between towers has been studied.
In this case, in addition to the above-mentioned error factors, factors such as the installation error of the tower, the deflection of the tower, and the like will be added, and in the case of the suspension type jumper device, it will be impossible to adopt the prefabricated wiring method. .

The present invention has been made in view of the above circumstances, and relates to a case in which a multi-conductor power transmission line is retained by a wedge-type clamp, and a suspension type jumper device is employed as a jumper device. An object of the present invention is to provide a suspended jumper device for a multi-conductor power transmission line that can be adopted.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a multi-conductor power transmission line is secured on both sides of a tension tower through wedge-type clamps, yokes and tension insulators, respectively. An intermediate portion of the jumper wire formed between the mold clamps, except for both side portions, is horizontally attached to a rigid horizontal member suspended from the yokes on both sides of the tower via a supporting member, and a longitudinal portion of the rigid horizontal member is provided. In the free portion between the jumper outlet of the wedge-shaped clamp and the portion along the rigid horizontal member in the jumper wire, as a surplus portion, A surplus jumper line portion is provided, which is formed in a U-shape within a range that can be accommodated in the inner space of the plurality of jumper line groups that are partially held by the jumper spacer. Characterized in that it comprises.

A second aspect of the present invention is characterized in that, in the first aspect, the extra length of the jumper line is formed at a plurality of positions of the same jumper line in the free portion of the jumper line.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A suspended jumper device for a multiconductor power transmission line according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side view of a suspended jumper device 21 according to one embodiment. In the figure, reference numeral 1 denotes a multi-conductor power transmission line, 2 denotes a span portion (span wire), and 3 denotes a jumper portion (jumper wire). Multi-conductor transmission line 1 in the illustrated example
Is a four-conductor power transmission line composed of four elementary conductors 1a, as shown in FIG. 2A showing the AA cross section of FIG. Reference numeral 4 denotes an arm of the tension tower, 5 denotes a series of tension insulators, and 6 denotes a yoke located on the span side of the series of tension insulators 5.

The suspension type jumper device 21 includes a rigid horizontal member 8 made of a rigid shaped steel material or a steel pipe material for minimizing a clearance required for electrical insulation between a jumper wire and a tower arm. , And both ends thereof are hung on a yoke 6 via a support member 9, and spacers 11 for holding the jumper wires 3 are attached to both ends and an intermediate portion of the rigid horizontal member 8 at intervals. Line 3
In this configuration, the intermediate portion except for both side portions is attached to the rigid horizontal member 8 by the spacer 11. The jumper wire 3 in the suspension type jumper device 21 is a portion between the jumper outlets (arrows 13) of the wedge-shaped clamps 12 on both sides of the tower of the power transmission line 1, and is connected to the jumper outlets 13 of the wedge-shaped clamps 12.
The both sides of the rigid horizontal member 8 which have slack between the end and the spacer 11 are the jumper wire free portions 3a, and the intermediate portion gripped by the spacer 11 and attached to the rigid horizontal member 8 is the jumper line horizontal portion 3b. Call.

The lengths of the support member 9 and the rigid horizontal member 8 are determined by the coordinates of the yoke 6 located on the span side of the tension insulator string 5 for holding the span electric wire 2 installed on the steel tower, the required clearance, and It is determined and calculated by calculating a jumper shape based on an angle (suspension angle) formed between the support member 9 and the rigid horizontal member 8, and the like. The support member 9 is generally provided with a length adjusting portion (not shown) for adjusting the clearance on site. For the length of the free portion 3a of the jumper wire 3, the same jumper shape calculation is performed, and the jumper outlet 13 of the wedge clamp 12 is obtained.
Then, the actual length between the spacers 11 provided at the end of the rigid horizontal member 8 is calculated, and the required number of jumper spacers is determined based on a predetermined interval between the jumper spacers 14 to manufacture.

The present invention relates to a case where a prefabricated overhead wire construction method is employed. The prefabricated electric wire to be used is at the maximum extension position of the sag adjusting bracket 17 provided between the wedge type clamp 12 and the yoke 6 (ie, The jumper shape calculation error and the manufacturing error are taken into account in the calculated jumper wire length L1 obtained by performing the above-described jumper shape calculation based on the jumper outlet 13 of the wedge-shaped clamp 12 (when the sag adjustment metal fitting 17 is most extended). The sum of the jumper wire actual length L2 (L2 = L1 + ΔLmax) to which the maximum error length ΔLmax is added and the span wire actual length L3 calculated on the basis of the jumper outlet 13 of the wedge-type clamp 12 is calculated as the actual wire length L4 (L4 =
(L2 + L3), the wire is prefabricated to a length that matches the actual wire length L4 when the wire is manufactured, and the wire is manufactured by marking the position corresponding to the jumper outlet 13 of the wedge clamp 12. Note that the above-mentioned actual length L3 of the span wire is calculated in consideration of the suspension tower in the middle, if any.

When the prefabricated electric wire manufactured as described above is used for wiring by the prefabricated wire-laying method, after the prefabricated electric wire is passed through the wheel of each tower, a wedge-type clamp 12 is attached to each tower. Is attached to the span wire 2 in accordance with the marking on the prefabricated wire,
Further, it is connected to a yoke 6 located on the span side of the tension insulator string 5 attached to the tower arm 4 via a sag adjusting bracket 17, and the sag of the span wire 2 is adjusted by the sag adjusting bracket 17. I do. Thereby, the work of tightening the span wires 2 is completed. The above operation is performed for each elementary conductor 1a of the multiconductor transmission line 1.
Do about.

After the above tightening work is completed, the rigid horizontal member 8 on which the support members 9 and the spacers 11 are attached in advance is lifted on the ground, and this is hung on the yoke 6 via the support members 9. Next, the free portion 3a on one side of the jumper wire 3
1 (the right free portion in FIG. 1) is formed into a predetermined size and shape, and a portion (jumper) of the jumper wire 3 along the rigid horizontal member 8 is provided by a spacer 11 provided on the rigid horizontal member 8. The line horizontal portion 3b) is linearly attached to the rigid horizontal member 8 and gripped. As a result, the portion (electric wire) taken in as the extra length according to the sag adjustment result of the span wire 2 is collected in the free portion 3a on the other side (the left free portion in FIG. 1). Then, as shown in the enlarged view of FIG. 3, a part of the free portion 3a (the free portion 3a having the extra length is not suitable for forming the free portion 3a into a predetermined size and shape). Required length)
Is defined as a surplus portion within a range that can be accommodated in the inner space portion of the plurality of jumper wires 3 held by the jumper spacer 14 (in the embodiment, a quadrangle formed by the four element conductors 1a (FIG. 2).
It is formed in the U-shape (inside of the dashed-dotted square in (c)). That is, the U-shaped extra jumper line portion 3c is formed. Next, a shield spacer 22 for preventing discontinuity of the electric field due to the opening of the U-shaped extra jumper line portion 3c.
Is mounted on the opening of the U-shaped extra jumper line portion 3c. The shield spacer 22 has grip portions at both ends, and the U-shaped jumper wire extra length portion 3 is formed by the grip portions at both ends.
Hold the base of c (the opening portion).

The jumper wire 3 is made of a stranded wire having the same structure as that of the span wire 2 and generally has a high bending rigidity because a steel core aluminum stranded wire is used. It is impossible to form the U-shaped extra jumper line portion 3c in the inner space of the group by human power. Therefore, as shown in FIG. 4, the left and right fixed rollers 25 and the intermediate movable roller 26 are arranged so as to support three or five points, and the movable roller 26 is hydraulically driven to make the jumper wire 3 move.
Extra length forming tool 27 for applying U-shaped plastic deformation to (3b)
May be used to form a U-shaped jumper extra length 3c. The length of the extra jumper wire portion 3c differs depending on the adjustment results of the span wire 2 and the jumper free portion 3a.
If the surplus portion 3c of the U-shaped jumper has a depth of about 50 mm, the shield spacer 22 for preventing discontinuity of the electric field can be omitted.

Regarding the material of each member, the rigid horizontal member 8 is a shaped steel member or a steel tube member, the support member 9 is a mild steel member, the jumper spacer 14 and the spacer 11 are an aluminum alloy casting or a combination of an aluminum alloy casting and a mild steel member. For example, the shield spacer 22 is preferably an aluminum alloy casting.

If the extra length 3c of the jumper wire formed on each of the element conductors 1a of the jumper wire 3 cannot be accommodated in the space inside the jumper wire group, the same jumper element conductor 1a may be provided at a plurality of locations in the longitudinal direction. A jumper extra length 3c may be provided. In this case, the extra portions 3c of the jumper line may be provided on the free portions 3a on both sides of the tower, or a plurality of extra lengths of the jumper line 3c may be provided only on the free portion 3a on one side. Providing at a plurality of locations in this way is effective in increasing the adjustment allowance. That is, even if the extra length is set to the jumper wire, it can be easily absorbed.

In each of the embodiments described above, the suspended jumper device for the 4-conductor power transmission line has been described. However, the number of conductors is arbitrary, and the suspension-type jumper device for the 3-conductor or 6-conductor power line or other multi-conductor power lines is used. The present invention can be applied to an apparatus.

[0023]

According to the present invention, when a multi-conductor power transmission line is to be wired by using a suspension type jumper device as a jumper device in a wire retaining system using a wedge-type clamp, the extra length of the jumper wire is used. Is configured such that a part of the free portion of the jumper wire is formed in a U-shape to absorb the excess length of the jumper wire in the suspension type jumper device. Therefore, even if it is not necessary to cut the jumper wire to eliminate the extra length and reconnect with a jumper sleeve as in the conventional case, the slackness adjustment result of the span wire such as irregularities in the free portion of the jumper wire can be obtained. The effect can be eliminated. As a result, it became possible to construct a multiconductor transmission line using a suspension type jumper device as a jumper device by an electric wire retaining method using a wedge-type clamp by a prefabricated wiring method.

According to the method of absorbing the excess length by bending into a U-shape, it is possible to increase the absorption amount (capture length) of the excess length of the jumper wire. It is also possible to adopt a prefabricated overhead line construction method using point-to-point surveying.

[Brief description of the drawings]

FIG. 1 is a side view showing a suspended jumper device for a multiconductor power transmission line according to an embodiment of the present invention.

2A is a sectional view taken along line AA of FIG. 1, FIG. 2B is a sectional view taken along line BB of FIG. 1, and FIG. 2C is a sectional view taken along line CC of FIG.

FIG. 3 is an enlarged side view of a jumper line free portion in FIG.

FIG. 4 shows the construction of the suspension type jumper device of the present invention.
It is a figure of the extra length forming tool used for forming a U-shaped extra jumper line part.

FIG. 5 is a side view showing a conventional suspended jumper device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 multi-conductor transmission line 1 a elementary conductor 2 span wire 3 jumper wire 3 a jumper wire free portion 3 b jumper wire horizontal portion 3 c extra length of U-shaped jumper wire 4 steel tower arm 5 tension insulator series 6 yoke 8 rigid horizontal material 9 Supporting material 11 Spacer 12 Wedge clamp 13 Jumper outlet of wedge clamp 14 Jumper spacer 17 Sag adjuster 21 Suspension jumper 22 Shield spacer 25, 26 Roller 27 Extra length forming tool

Claims (2)

[Claims] 1. A wedge-type clamp (1) is provided on each side of an arm (4) of a tension tower with a multiconductor transmission line (1).
2), while retaining it via the yoke (6) and the tension insulator string (5), wedge-type clamps (1
2) The middle part of the jumper wire (3) formed between the two parts except the both sides is connected to the horizontal yoke (6) on both sides of the tower by a rigid horizontal member (8) suspended via a support member (9). Attached horizontally, supported by spacers (11) arranged at intervals in the longitudinal direction of the rigid horizontal member (8), and a jumper outlet of the wedge-shaped clamp (12) at the jumper line (3) ( In the free portion (3a) between the portion 13) and the portion attached to the rigid horizontal member (8), a part of the free portion (3a) is held as a surplus portion by the jumper spacer (14). A suspended jumper for a multi-conductor power transmission line, comprising a jumper wire extra length (3c) formed in a U-shape within a range that can be accommodated in the internal space of the group of jumper wires (3). apparatus. 2. A free portion (3) of said jumper wire (3).
The suspended jumper device for a multi-conductor power transmission line according to claim 1, wherein said extra jumper line portion (3c) is formed at a plurality of positions of the same jumper line (3) in a).