CN212428265U - Split type transposition device of two return circuit shaft towers - Google Patents
Split type transposition device of two return circuit shaft towers Download PDFInfo
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- CN212428265U CN212428265U CN202021852079.8U CN202021852079U CN212428265U CN 212428265 U CN212428265 U CN 212428265U CN 202021852079 U CN202021852079 U CN 202021852079U CN 212428265 U CN212428265 U CN 212428265U
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Abstract
The utility model relates to a split type transposition device of two return circuit shaft towers, including the main tower, the main tower is provided with upper strata cross arm, middle level cross arm and lower floor's cross arm, is located to be provided with well phase transition and goes up the phase jumper wire between the upper strata cross arm of same side and the middle level cross arm, is located to be provided with well phase transition and goes up the phase jumper wire under between the middle level cross arm of same side and the lower floor's cross arm, the both sides of main tower are provided with supplementary tower respectively, supplementary tower is close to the main tower side and is provided with upper portion cross arm and lower part cross arm, be provided with the phase transition under the phase jumper wire between upper portion cross. The device has simple wiring and controllable jumper gap; the height of the iron tower or the length of the cross arm is reduced, so that the torque and the bending moment of the ground wire on the iron tower are reduced, the stress condition of the iron tower is improved, and the reliability of the iron tower is improved.
Description
Technical Field
The utility model relates to a split type transposition device of two return circuits shaft tower.
Background
In a long-distance high-voltage transmission line, in order to control the unbalance degree of system voltage and current, the transmission line needs to be transposed to ensure the safe and stable operation of a power system.
The transposition of the transmission line is usually carried out on a transposition tower, and for a single-loop line, the transposition of the lead can be realized by measures such as additionally arranging a jumper frame on a strain tower. For a double-loop power transmission line, because three-phase wires of the same loop are vertically arranged on one side, the available space is small. The higher the voltage grade is, the larger the requirement on the gap is, the longer the tension string and the jumper string are, the longer and the large arc sag of the jumper between strings are, and the jumper arrangement mode is complex, the construction is difficult and the operation and maintenance difficulty is large during transposition. To achieve simultaneous transposition of the inner and outer circuits at a corner, it is common to choose to arrange the transposition towers at a small corner (typically not exceeding 20 °).
The early double-loop circuit adopts 'double-single-double' transposition, the transposition mode is essentially to divide 1 double loop into 2 single loops for transposition, and double loops are synthesized after transposition, and the transposition mode is lagged behind and basically not adopted any more. Currently, most of double-circuit lines adopt double-circuit strain tower transposition, and 3 common modes exist: the method comprises a single bus bypass jumper outward winding mode, a double bus bypass jumper outward winding mode and a bypass jumper inward winding mode.
The single bus bypass jumper wire outward winding transposition mode is suitable for lines with low voltage grade and small tower head gap requirement; the double-bus bypass jumper outward-winding transposition mode and the bypass jumper inward-winding transposition mode are more suitable for circuits with high voltage level and large gap requirements, and the double-bus bypass jumper outward-winding transposition mode is adopted for 500kV and 750kV circuits in China at present. The jumper wire adopting the double-bus bypass jumper wire external winding transposition mode and the bypass jumper wire internal winding transposition mode is complex, and due to the fact that the strain insulator string and the jumper wire string are long, various gap requirements are large, the jumper wire gap is not easy to control, and the problem of phase distance or relative ground distance tension is easily caused; and the transposition tower has longer cross arm, is influenced by the torque of the iron tower and has larger mass. Under the influence of angles, the double-bus bypass jumper wire outward winding transposition mode and the bypass jumper wire inward winding transposition mode are only suitable for small rotation angles (generally not exceeding 20 degrees).
The inner winding transposition mode of the double-bus bypass jumper wire is as follows: the bypass jumper wire is between two return circuits, and the jumper wire clearance is difficult to control, and two jumper wire cluster heights that iron tower height is higher than ordinary strain insulator tower consider about 10m according to 500kV circuit, and it is inconvenient that there is the operation of bypass jumper wire to maintain simultaneously in the body of the tower openly.
The bypass jumper is arranged outside the two loops, the gap of the jumper is not easy to control, and the problem of short distance between phases is easy to generate; and the transposition tower has longer cross arm (the length is increased by about 10m compared with the common strain tower), is influenced by the torque of the iron tower, has larger mass, and has severe stress problem after the length of the cross arm is doubled.
Disclosure of Invention
The utility model aims to provide a split type transposition device of a double-loop tower, which has simple wiring and controllable jumper clearance; the height of the iron tower or the length of the cross arm is reduced, so that the torque and the bending moment of the ground wire on the iron tower are reduced, the stress condition of the iron tower is improved, and the reliability of the iron tower is improved.
The technical scheme of the utility model lies in: the utility model provides a split type transposition device of two return circuit shaft towers, includes the main tower, the main tower is provided with upper strata cross arm, middle level cross arm and lower floor's cross arm, is provided with the phase transition in the phase jumper wire between the upper strata cross arm that is located same side and the middle level cross arm, is provided with the phase transition in the phase jumper wire down between the middle level cross arm that is located same side and the lower floor's cross arm, the both sides of main tower are provided with auxiliary tower respectively, auxiliary tower is close to the main tower side and is provided with upper portion cross arm and lower part cross arm, be provided with phase transition lower phase jumper wire between upper portion cross arm and the lower part.
Furthermore, wire jumper frames are respectively arranged on two sides of the upper layer cross arm, the middle layer cross arm and the lower layer cross arm, lead hanging plates are respectively arranged on the front side and the rear side of each wire jumper frame, and insulation strings used for connecting phase lines are installed on the lead hanging plates.
Furthermore, one end of the middle phase-change upper phase jumper is connected with the phase line connected to the rear side of the middle-layer cross arm, and is connected with the phase line connected to the front side of the upper-layer cross arm through a squirrel cage jumper arranged between the upper-layer cross arm and the middle-layer cross arm.
Furthermore, one end of the lower phase-change middle phase jumper is connected with the phase line connected to the rear side of the lower cross arm, and is connected with the phase line connected to the front side of the middle cross arm through a squirrel cage jumper arranged between the middle cross arm and the lower cross arm.
Furthermore, jumper strings used for hanging and fixing squirrel cage jumper wires are respectively arranged on the lower side of the upper layer cross arm, the upper side of the middle layer cross arm and the upper side of the lower layer cross arm.
Furthermore, one end of the upper phase-change lower phase jumper is connected with the phase line connected to the rear side of the upper layer cross arm through the upper lapping jumper, and the other end of the upper phase-change lower phase jumper is connected with the phase line connected to the rear side of the lower layer cross arm through the lower lapping jumper.
Furthermore, jumper racks are respectively arranged on the front side and the rear side of the upper cross arm and the lower cross arm, and jumper strings used for hanging and fixing phase-change lower phase jumpers are arranged on the jumper racks.
Further, the main tower is of an umbrella-shaped or drum-shaped structure; the auxiliary tower is of an F-shaped structure, the supporting legs of the auxiliary tower are of unequal-length leg connecting structures, and the distance between the center of the auxiliary tower and the center of the main tower is 30-40 m.
Compared with the prior art, the utility model has the advantages of it is following:
the device is combined with the auxiliary tower through the main tower, and the main tower is used for hanging the line of a main line, so that corridor resources are reduced; the auxiliary tower is used for winding and connecting jumper wires, the arrangement of the jumper wires is simple, and the gap of the jumper wires is controllable; the height of the iron tower is reduced or the size of the cross arm of the main tower is shortened by nearly 50 percent, the torque of the cross arm is greatly reduced, the torque and the bending moment of the ground wire on the iron tower are further reduced, and the stress condition of the iron tower is improved. The load superposition of the upwind caused by complex forms such as low-altitude strong vertical shear, strong convection area, strong amplitude closure, strong vertical movement and the like is considered by combining the structural design of the lower cross arm, the reliability of the transposition tower is improved, and the operation and the maintenance are convenient. In conclusion, although the auxiliary tower can increase a small amount of construction cost, the reliability of the whole line can be improved, and meanwhile, the occupation of corridor resources is reduced, so that the auxiliary tower has good application value.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a cross-sectional view taken along line I-I of fig. 1 in accordance with the present invention;
fig. 3 is a sectional view II-II of fig. 1 of the present invention;
FIG. 4 is a structural diagram of the 500kV double-circuit transposition jumper transposition device of the utility model;
in the figure: 10-ground wire 100-main tower 110-upper layer cross arm 120-middle layer cross arm 130-lower layer cross arm 140-middle phase change upper phase jumper wire 150-lower phase change middle phase jumper wire 160-jumper wire frame 170-insulation string 180-squirrel cage jumper wire 190-jumper wire string 200-auxiliary tower 210-upper cross arm 220-lower cross arm 230-upper phase change lower phase jumper wire 231-upper lap jumper wire 232-lower lap jumper wire 233-vertical wire 234-horizontal wire 240-jumper wire frame 250-jumper wire string.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Reference to the drawings
Refer to fig. 1 to 4
The utility model provides a split type transposition device of double-circuit shaft tower, includes main tower 100, main tower is provided with upper strata cross arm 110, middle level cross arm 120 and lower floor's cross arm 130, is provided with well phase transition between the upper strata cross arm that is located same side and the middle level cross arm and goes up jumper wire 140 (B looks), is provided with down phase transition middle jumper wire 150 (C looks) between the middle level cross arm that is located same side and the lower floor's cross arm, the both sides of main tower are provided with auxiliary tower 200 respectively, auxiliary tower is close to main tower side and is provided with upper portion cross arm 210 and lower part cross arm 220, be provided with phase transition lower phase jumper wire 230 (A looks) between upper portion cross arm and the lower part cross arm.
In this embodiment, two sides of the upper layer cross arm, the middle layer cross arm and the lower layer cross arm are respectively provided with a jumper wire rack 160, the front side and the rear side of the jumper wire rack are respectively provided with a conductor hanging plate, and the conductor hanging plate is provided with an insulation string 170 for connecting phase wires.
In this embodiment, one end of the middle phase-change upper phase jumper is connected to the phase line connected to the rear side of the middle cross arm via the insulation string, and is connected to the phase line connected to the front side of the upper cross arm via the insulation string via the squirrel cage jumper 180 disposed between the upper cross arm and the middle cross arm.
In this embodiment, one end of the lower phase-change middle phase jumper is connected to the phase line connected to the rear side of the lower cross arm through the insulation string, and is connected to the phase line connected to the front side of the middle cross arm through the insulation string via the squirrel cage jumper arranged between the middle cross arm and the lower cross arm.
In this embodiment, the lower side of the upper layer cross arm, the upper and lower sides of the middle layer cross arm, and the upper side of the lower layer cross arm are respectively provided with a jumper string 190 for suspending or fixing a squirrel cage jumper, so as to fix and position the squirrel cage jumper.
In this embodiment, one end of the upper phase-change lower phase jumper is connected to the phase line connected to the rear side of the upper cross arm through the insulating string by the upper lap jumper 231, and the other end of the upper phase-change lower phase jumper is connected to the phase line connected to the rear side of the lower cross arm through the lower lap jumper 232.
In this embodiment, jumper racks 240 are respectively disposed on the front and rear sides of the upper and lower cross arms, the upper phase-change lower phase jumper includes a jumper string suspended on the lower side of the jumper rack of the upper cross arm and a jumper string 250 fixed on the upper side of the jumper rack of the lower cross arm, the upper and lower jumper strings on the front side and the upper and lower jumper strings on the rear side are respectively connected by a vertical wire 233, and the two vertical wires are connected by a horizontal wire 234.
In this embodiment, the height of the lower jumper wire hanging point of the auxiliary tower enables the height of the upper end of the jumper wire string positioned on the lower side to be as high as that of the hanging point of the main tower, the height of the upper jumper wire hanging point of the auxiliary tower enables the height of the lower end of the jumper wire string positioned on the upper side and suspended to be as high as that of a wire of an upper-layer cross arm, and the length of the jumper wire cross arm of the auxiliary tower is controlled according to the requirement of jumper wire windage yaw on the.
In this embodiment, two sides of the upper end of the main tower are also respectively connected with a ground wire 10.
In this embodiment, the main tower is a conventional tension or angle tower type, and the main tower is an umbrella-shaped or drum-shaped structure; according to the arrangement requirement of jumper wires, the auxiliary tower is of an F-shaped structure; and the supporting legs of the auxiliary tower adopt an all-dimensional unequal-length leg connecting structure, and the configuration of long and short legs can meet the requirement that basic plane evolution is not basically carried out under the condition of the engineering terrain.
In this embodiment, the distance between the center of the auxiliary tower and the center of the main tower is 30-40m, and the height of the tower body is determined according to the terrain elevation at the tower position of the auxiliary tower.
In this embodiment, the front side is the wire output direction, and the rear side is the wire input direction.
In this embodiment, the lapping jumper of the auxiliary tower and the main tower, the upper-variable lower jumper string of the auxiliary tower, and the middle-variable upper and lower-variable jumper strings on the main tower all consider the structural load effect under the superposition of the transverse wind and the upward wind, consider the structural deflection deformation of the tower under the load effect, and check the electrical gap according to the structural effect caused by the connection structure.
In this embodiment, the electrical clearance between the live part of the jumper and the grounding framework such as the tower body meets the requirement of the corresponding design specification. The minimum gap (m) is as follows:
note: in the 500kV air gap column, the left data is suitable for the altitude of no more than 500m, and the right data is suitable for the altitude of 500-1000 m.
Referring to fig. 4, the jumper sag and the wire length of the split type transposition device for the 500kV double-loop tower are as follows:
the above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (8)
1. The utility model provides a split type transposition device of double-circuit shaft tower, includes the main tower, its characterized in that, the main tower is provided with upper strata cross arm, middle level cross arm and lower floor's cross arm, is provided with well phase transition upper phase jumper wire between the upper strata cross arm that is located same side and the middle level cross arm, is provided with well phase transition middle phase jumper wire down between the middle level cross arm that is located same side and the lower floor's cross arm, the both sides of main tower are provided with auxiliary tower respectively, auxiliary tower is close to the main tower side and is provided with upper portion cross arm and lower part cross arm, be provided with well phase transition lower phase jumper wire between upper portion cross arm and the lower part.
2. The split type transposition device for the double-loop towers according to claim 1, wherein jumper racks are respectively arranged on two sides of the upper layer cross arm, the middle layer cross arm and the lower layer cross arm, lead hanging plates are respectively arranged on the front side and the rear side of each jumper rack, and insulation strings for connecting phase lines are installed on the lead hanging plates.
3. The split type transposition device of the double-loop tower as claimed in claim 1 or 2, wherein one end of the phase-transition upper phase jumper is connected with the phase line connected to the rear side of the middle-layer cross arm, and is connected with the phase line connected to the front side of the upper-layer cross arm through a squirrel cage jumper arranged between the upper-layer cross arm and the middle-layer cross arm.
4. The split type transposition device of a double-circuit tower as claimed in claim 3, wherein one end of the phase jumper in the lower phase change is connected with the phase line connected to the rear side of the lower cross arm, and is connected with the phase line connected to the front side of the middle cross arm through a squirrel cage jumper arranged between the middle cross arm and the lower cross arm.
5. The split type transposition device of the double-loop tower as claimed in claim 4, wherein jumper strings for hanging and fixing mouse cage jumpers are respectively arranged on the lower side of the upper-layer cross arm, the upper side of the middle-layer cross arm and the upper side of the lower-layer cross arm.
6. The split type transposition device for the double-loop towers according to claim 1, wherein one end of the upper phase-change lower phase jumper is connected with the phase line connected to the rear side of the upper cross arm through an upper lap jumper, and the other end of the upper phase-change lower phase jumper is connected with the phase line connected to the rear side of the lower cross arm through a lower lap jumper.
7. The split type transposition device for the double-loop towers as claimed in claim 1 or 6, wherein jumper racks are respectively arranged on the front and rear sides of the upper cross arm and the lower cross arm, and jumper strings for hanging and fixing upper phase-change lower phase jumpers are arranged on the jumper racks.
8. The split type transposition device for the double-loop towers as claimed in claim 1, wherein the main tower is of an umbrella-shaped or drum-shaped structure; the auxiliary tower is of an F-shaped structure, the supporting legs of the auxiliary tower are of unequal-length leg connecting structures, and the distance between the center of the auxiliary tower and the center of the main tower is 30-40 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021852079.8U CN212428265U (en) | 2020-08-31 | 2020-08-31 | Split type transposition device of two return circuit shaft towers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021852079.8U CN212428265U (en) | 2020-08-31 | 2020-08-31 | Split type transposition device of two return circuit shaft towers |
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| CN212428265U true CN212428265U (en) | 2021-01-29 |
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| CN202021852079.8U Active CN212428265U (en) | 2020-08-31 | 2020-08-31 | Split type transposition device of two return circuit shaft towers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115405149A (en) * | 2022-09-16 | 2022-11-29 | 国网青海省电力公司经济技术研究院 | Double-loop transposition tower for power transmission line |
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2020
- 2020-08-31 CN CN202021852079.8U patent/CN212428265U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115405149A (en) * | 2022-09-16 | 2022-11-29 | 国网青海省电力公司经济技术研究院 | Double-loop transposition tower for power transmission line |
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