Single-loop tension-resistant inverted phase sequence universal commutation iron tower

Abstract

The invention provides a single-loop tension-resistant inverted phase sequence universal commutation iron tower, and belongs to the technical field of power transmission and transformation projects. The problem that later operation and maintenance are difficult due to the fact that phase sequence labeling of an existing commutation iron tower is not clear is solved. Comprising a tower body, a ground wire cross arm is installed at the top end of the tower body, a middle-phase wire jumper hanging point is arranged at the end of the ground wire cross arm, a middle-phase wire insulator string hanging point, two side-phase wire cross arms and a universal commutation support are arranged on the portion, below the ground wire cross arm, of the tower body, and the two side-phase wire cross arms are provided with corresponding supporting fixing points respectively; the universal commutation support is provided with an upper layer of post insulator fixing points and a lower layer of post insulator fixing points, the upper layer of post insulator fixing points are connected with in-phase-sequence first side phase wires which are located on the two sides of the tower body and need to be subjected to commutation, and the lower layer of post insulator fixing points are connected with in-phase-sequence second side phase wires which are located on the two sides of the tower body and need to be subjected to commutation. The method is applied to phase change of the single-circuit tension inversely-connected iron tower.

Description

Technical Field

[0001] The invention provides a single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower, belonging to the technical field of power transmission and transformation engineering. Background Art

[0002] At present, the high-voltage power grid structure in various regions is mainly based on the transmission and distribution network of 220kV and below voltage levels. The connection between substations at all levels and the connection of substations on the receiving side must go through the links of power transformation and transmission, which leads to the problem of inconsistent phase sequence of different substations. Practice has shown that the phase sequence correspondence is the most easily overlooked in all links. Since the phase sequence is relatively simple, the problem will not be discovered until the phase sequence correspondence of the substations on both sides is checked after the tightening operation is completed in the later stage of construction, making the later processing extremely complicated, and ultimately leading to delays in the commissioning and operation of substations and transmission and distribution lines. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower.

[0004] The technical solution adopted by the present invention is: a single-circuit tension inverted phase sequence universal phase-changing iron tower, comprising a tower body, a ground wire cross arm is installed at the top of the tower body, a middle-phase conductor jumper hanging point is arranged at the end of the ground wire cross arm, a middle-phase conductor insulator string hanging point, two side-phase conductor cross arms and a universal phase-changing bracket are arranged on the tower body below the ground wire cross arm, and corresponding support fixing points are respectively arranged on the two side-phase conductor cross arms; The universal phase-changing bracket is provided with upper and lower layers of supporting insulator fixing points, and the first side phase conductors of the same phase sequence that need to be phase-changed and located on both sides of the tower body are connected through the supporting insulator fixing points of the upper layer, and the second side phase conductors of the same phase sequence that need to be phase-changed and located on both sides of the tower body are connected through the supporting insulator fixing points of the lower layer.

[0005] Furthermore, the two side phase conductor cross arms are respectively a first side phase conductor cross arm and a second side phase conductor cross arm, wherein the bottom end of the first side phase conductor cross arm is provided with a lower support fixing point of a side phase conductor cross arm support insulator facing downward, and the top end of the second side phase conductor cross arm is provided with an upper support fixing point of an upper jumper support insulator of the side phase conductor cross arm facing upward.

[0006] Furthermore, a first side phase conductor first insulator string hanging point and a first side phase conductor second insulator string hanging point are respectively arranged on both sides of the end of the first side phase conductor cross arm; A second side phase conductor first insulator string hanging point and a second side phase conductor second insulator string hanging point are respectively arranged at both sides of the end of the second side phase conductor cross arm.

[0007] Furthermore, the universal phase-changing bracket includes two oblique supports and a plurality of transverse supports, one end of the two oblique supports is fixedly connected to the tower body, the other end of the two oblique supports is fixedly connected to the transverse support perpendicular to the tower body, and the end of the transverse support perpendicular to the tower body is fixedly connected to the tower body; Two transverse supports parallel to the tower body are arranged on the transverse support perpendicular to the tower body, and at least two support insulator fixing points are fixed on the two parallel transverse supports respectively. The support insulator fixing points on one transverse support are installed facing upward, and the support insulator fixing points on the other transverse support are installed facing downward, thereby forming upper and lower layer side phase conductor hanging nodes.

[0008] Further, the first side phase conductor A is connected in sequence to the conductor crimping point of the second side phase conductor cross arm end facing upward, the supporting fixed point on the jumper support insulator on the cross arm of the second side phase conductor, the conductor crimping point fixed on the support insulator facing upward of the universal phase-changing bracket, and the conductor tension clamp on the first side phase conductor second insulator string hanging point of the first side phase conductor cross arm through the lead wire of the conductor tension clamp on the first side phase conductor insulator string hanging point; The second side phase conductor C is connected in sequence through the tension wire clamp lead of the first side phase conductor first insulator string hanging point conductor side to the wire crimping point of the first side phase conductor crossarm support insulator lower support fixing point at the end of the first side phase conductor crossarm, the wire crimping point fixed on the support insulator facing downward in the universal phase-changing bracket, and the tension wire clamp of the second side phase conductor second insulator string hanging point conductor side of the second side phase conductor crossarm.

[0009] Furthermore, the first side phase conductor cross arm and the second side phase conductor cross arm are on the same horizontal plane.

[0010] Furthermore, the universal phase-changing bracket is fixed on one side of the tower body.

[0011] Furthermore, silicone rubber post insulators are used for the lower support fixing points of the side phase conductor cross arm post insulators and the upper support fixing points of the jumper post insulators on the side phase conductor cross arm.

[0012] Furthermore, the post insulator fixing points on the universal phase-changing bracket are all made of silicone rubber post insulators.

[0013] Furthermore, two side-phase conductor cross arms are fixed below the hanging points of the middle-phase conductor insulator string, and the universal phase-changing bracket is fixed below the two side-phase conductor cross arms.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: the present invention realizes the phase sequence transposition of the side phase conductor by adding an ingenious design of the phase-changing bracket, while meeting the gap requirement of the conductor to the tower body. The design of the single-circuit tension inverted phase sequence universal phase-changing iron tower enables the phase sequence change to be completed on one tension tower. Compared with the single-circuit change in previous projects, it not only reduces the occupation of one transposition tower and land, saving investment; it also improves the convenience of construction and avoids the difficulty of pre-checking the phase during the installation of the conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic structural diagram of the universal phase-changing bracket of the present invention; In the figure: 1 is the tower body, 2 is the ground wire cross arm, 3 is the first side phase conductor cross arm, 301 is the lower support fixing point of the side phase conductor cross arm support insulator, 4 is the second side phase conductor cross arm, 401 is the upper support fixing point of the side phase conductor cross arm support insulator, 5 is the universal phase change bracket, 501 is the first upper support support insulator fixing point of the side phase conductor phase change bracket, 502 is the second upper support support insulator fixing point of the side phase conductor phase change bracket, 503 is the third upper support support insulator fixing point of the side phase conductor phase change bracket, 504 is the first lower support support insulator fixing point of the side phase conductor phase change bracket, 505 is the second lower support support insulator fixing point of the side phase conductor phase change bracket, 506 is the third lower support support insulator fixing point of the side phase conductor phase change bracket, and 5001 is the jumper on the phase change bracket conductor The first upper supporting conductor fixing point of the support insulator, 5002 is the second upper supporting conductor fixing point of the jumper support insulator on the commutation support conductor, 5003 is the third upper supporting conductor fixing point of the jumper support insulator on the commutation support conductor, 5004 is the first lower supporting conductor fixing point of the jumper support insulator under the commutation support conductor, 5005 is the second lower supporting conductor fixing point of the jumper support insulator under the commutation support conductor, 5006 is the third lower supporting conductor fixing point of the jumper support insulator under the commutation support conductor, 6 is the middle phase conductor jumper hanging point, 7 is the middle phase conductor insulator string hanging point, 8 is the second side phase conductor first insulator string hanging point, 9 is the second side phase conductor second insulator string hanging point, 10 is the first side phase conductor first insulator string hanging point, 11 is the first side phase conductor second insulator string hanging point; Among them, A is the first side phase conductor, B is the middle phase conductor, and C is the second side phase conductor. DETAILED DESCRIPTION

[0016] like Figure 1 and 2As shown, the present invention provides a single-circuit tension-resistant inverted phase sequence universal phase-changing iron tower, comprising a tower body 1, a ground wire cross arm 2 is arranged at the top of the tower body 1, and the tower body 1 below the ground wire cross arm 2 is provided with a middle phase conductor insulator string hanging point 7, a first side phase conductor cross arm 3 and a second side phase conductor cross arm 4 of the next layer, and a universal phase-changing bracket 5 of the next layer in sequence from top to bottom.

[0017] Ground wire tension clamp hanging points are provided on both sides of the ground wire cross arm 2. Two ground wires pass through the ground wire tension clamp hanging points on both sides of the ground wire cross arm 2 at the top of the iron tower respectively, and then the ground wires are suspended through the tension clamps respectively, and the ground wires on both sides are connected by jumper wires.

[0018] The middle phase conductor B is connected to the conductors on both sides through the front end tension wire clamp of the tension insulator string on one side of the middle phase conductor insulator string hanging point 7 on the tower body 1, the suspension wire clamp of the suspension insulator string connected to the ground wire crossarm jumper hanging point, and the front end tension wire clamp of the middle phase hanging point tension insulator string on the other side of the tower body 1.

[0019] The first side phase conductor A is connected in sequence through the conductor side wire clamp of the first insulator string hanging point 8 of the second side phase conductor to the upper supporting wire fixing point 401 of the jumper support insulator on the side phase conductor crossarm at the end of the second side phase conductor crossarm 4, the first upper supporting support insulator fixing point 501 of the side phase conductor commutation bracket of the universal commutation bracket 5, the second upper supporting support support insulator fixing point 502 of the side phase conductor commutation bracket, the first upper supporting wire fixing point 5001 of the jumper support insulator on the commutation bracket conductor, the second upper supporting wire fixing point 5002 of the jumper support insulator on the commutation bracket conductor, the third upper supporting wire fixing point 5003 of the jumper support insulator on the commutation bracket conductor, and the conductor side wire clamp of the first insulator string hanging point 11 of the first side phase conductor, and the transition of the first side phase conductor A is completed while meeting the discharge gap requirements of working conditions such as power frequency voltage, operating overvoltage and lightning overvoltage.

[0020] The second side phase conductor C is connected in sequence through the conductor side wire clamp of the first side phase conductor first insulator string hanging point 10 to the side phase conductor crossarm support insulator lower support fixing point 301 at the end of the first side phase conductor crossarm 3, the side phase conductor commutation bracket first lower support support support insulator fixing point 504 of the universal commutation bracket 5, the side phase conductor commutation bracket second lower support support support insulator fixing point 505, the side phase conductor commutation bracket third lower support support support insulator fixing point 506 of the side phase conductor commutation bracket, the commutation bracket conductor lower jumper support insulator first lower support wire fixing point 5004, the commutation bracket conductor lower jumper support insulator second lower support wire fixing point 5005, the commutation bracket conductor lower jumper support insulator third lower support wire fixing point 5006, and the conductor side wire clamp of the second insulator string hanging point 9 of the second side phase conductor, and the transition of the second side phase conductor C is completed while meeting the discharge gap requirements of working conditions such as power frequency voltage, operating overvoltage and lightning overvoltage.

[0021] Specifically, the universal phase-changing bracket 5 is installed on the tower body 1 about 1.5 meters below the first-side phase conductor crossarm 3 and the second-side phase conductor crossarm 4, and must correspond to the bolt holes of the original tower body; the phase-changing is completed intuitively on one side of the tower body, avoiding misoperation during construction.

[0022] The universal phase-changing bracket 5 is fixed to one side of the tower body 1 through two oblique supports and multiple horizontal supports, forming a complete structure with the tower body 1. The screw pitch of the universal phase-changing bracket 5 and the tower body 1 fixing point must be consistent with the tower body 1, and the matching long bolts are replaced to fix the tower body 1. The phase sequence mark is clearly identifiable, the tower height is not increased, the tower structure conditions are not changed, and the construction safety is high.

[0023] The universal phase-changing bracket 5 of the present invention is fixedly connected to the connecting part of the iron tower by bolts. The distance design of the bolt hole position is based on the original bolt hole position design of the main material of the iron tower. The bolts are designed with extended bolts. FZSW-110 / 4 (26.37kg) organic composite support insulators are used to support the jumper of the fixed conductor. The jumpers of the A and C phases of the tension tower are hard-connected to ensure that the electrical safety distance to the tower body grounding body meets the regulations and is not affected by wind deviation.

[0024] The support insulators of the A and C phase conductors are fixed with one phase supported upwards and the other phase supported downwards. The fixing method cleverly adopts an upper and lower two-layer design, which perfectly solves the problem of electrical safety distance of jumpers on one side.

[0025] The post insulators of the present invention all adopt silicone rubber post insulators, which can greatly reduce the weight of the universal phase-changing bracket 5 and the cross arms of the two side-phase conductors without affecting the stress of the iron tower.

[0026] In addition to the load combination of the weight of the universal phase-changing bracket 5 and its accessories on the iron tower, the combined structure of the horizontal support and the oblique support of the universal phase-changing bracket 5 of the present invention also takes into account the force of the wind and ice load on the iron tower. After verification, under normal operation of the universal phase-changing bracket 5, the overall structure of the weight of the universal phase-changing bracket 5 and its accessories bears the downward pressure, and the comprehensive downward pressure load is about 2.9KN. After the additional load, the iron tower meets the design conditions for the application of the iron tower. Therefore, the load combination of each point of the universal phase-changing bracket 5 of the present invention has a very small force on the iron tower, which meets the requirements of the long-term force of the iron tower.

[0027] When using the universal phase-changing iron tower of the present invention, it is only necessary to reverse the phase sequence of the A and C phases of the tension tower during construction to solve the problem of inconsistent phase sequence of the substations on both sides. And due to the arrangement of the upper and lower layers, it is also easy to identify the corresponding phase sequence during construction, which also saves time and effort when hanging the wiring, greatly improving the efficiency of phase-changing wiring.

[0028] After detailed demonstration and verification, the load combination of each point of the universal phase-changing bracket 5 has a very small force on the iron tower, which meets the requirements of long-term force on the iron tower. In addition, the phase-changing bracket simplifies the design concept and is not limited to considering only the heavy-tonnage phase-changing tower. In the current single-circuit power transmission and distribution line design process, phase change is no longer a difficult point that requires special consideration. The connection points of the matching interval inlet and outlet lines and the busbar are consistent with the connection points of other intervals, ensuring the consistency of the layout of the substation inlet and outlet lines. There is no need to consider the phase sequence arrangement in the substation. The phase change is completed by the line side, and the station design meets the typical design requirements, thereby achieving an aesthetic effect.

[0029] The use of single-circuit tension tower phase-changing brackets reduces the types of towers used in the design, simplifies the phase-changing layout, and emphasizes that the installation location should be as close to one side of the substation as possible in the design. The purpose is to intuitively identify the phase sequence correspondence during subsequent maintenance and operation, and to focus on issues such as project safety, maximization of economic benefits, and convenience of maintenance.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower, comprising a tower body (1), characterized in that: A ground wire cross arm (2) is installed at the top of the tower body (1), a middle phase conductor jumper hanging point (6) is arranged at the end of the ground wire cross arm (2), a middle phase conductor insulator string hanging point (7), two side phase conductor cross arms and a universal phase-changing bracket (5) are arranged on the tower body (1) below the ground wire cross arm (2), and corresponding support fixing points are respectively arranged on the two side phase conductor cross arms; The universal phase-changing bracket (5) is provided with upper and lower layers of support insulator fixing points, and the first side phase conductors of the same phase sequence required for phase change located on both sides of the tower body (1) are connected via the support insulator fixing points of the upper layer, and the second side phase conductors of the same phase sequence required for phase change located on both sides of the tower body (1) are connected via the support insulator fixing points of the lower layer.

2. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower according to claim 1, characterized in that: The two side phase conductor cross arms are respectively a first side phase conductor cross arm (3) and a second side phase conductor cross arm (4), wherein the bottom end of the first side phase conductor cross arm (3) is provided with a side phase conductor cross arm support insulator lower support fixing point (301) facing downward, and the top end of the second side phase conductor cross arm (4) is provided with a side phase conductor cross arm upper jumper support insulator upper support fixing point (401) facing upward.

3. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower according to claim 2, characterized in that: A first side phase conductor first insulator string hanging point (10) and a first side phase conductor second insulator string hanging point (11) are respectively arranged on both sides of the end of the first side phase conductor cross arm (3); A second side phase conductor first insulator string hanging point (8) and a second side phase conductor second insulator string hanging point (9) are respectively arranged on both sides of the end of the second side phase conductor cross arm (4).

4. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower according to claim 3, characterized in that: The universal phase-changing bracket (5) comprises two oblique supports and a plurality of transverse supports, one end of the two oblique supports being fixedly connected to the tower body (1), the other ends of the two oblique supports being fixedly connected to a transverse support perpendicular to the tower body (1), and the end of the transverse support perpendicular to the tower body (1) being fixedly connected to the tower body (1); Two transverse supports parallel to the tower body (1) are arranged on a transverse support perpendicular to the tower body (1), and at least two support insulator fixing points are respectively fixed on the two parallel transverse supports, wherein the support insulator fixing points on one transverse support are installed facing upward, and the support insulator fixing points on the other transverse support are installed facing downward, thereby forming upper and lower layer side phase conductor hanging nodes.

5. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower according to claim 4, characterized in that: The first side phase conductor A is connected in sequence to the conductor crimping point of the support fixing point (401) on the jumper support insulator on the positively upward side phase conductor cross arm of the end of the second side phase conductor cross arm (4), the conductor crimping point fixed on the positively upward support insulator of the universal phase-changing bracket (5), and the conductor side tension clamp of the first side phase conductor second insulator string hanging point (11) of the first side phase conductor cross arm (3) through the conductor side tension clamp lead wire of the second side phase conductor insulator string hanging point (8); The second side phase conductor C is connected in sequence to the conductor crimping point of the lower support fixing point (301) of the side phase conductor cross arm support insulator facing downward at the end of the first side phase conductor cross arm (3), the conductor crimping point of the support insulator facing downward of the universal phase-changing bracket (5), and the conductor side tension clamp of the second side phase conductor second insulator string hanging point (9) of the second side phase conductor cross arm (4) through the conductor side tension clamp lead of the first side phase conductor first insulator string hanging point (10).

6. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower according to claim 2, characterized in that: The first side phase conductor cross arm (3) and the second side phase conductor cross arm (4) are located on the same horizontal plane.

7. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower according to claim 1, characterized in that: The universal phase-changing bracket (5) is fixed on one side of the tower body (1).

8. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower according to claim 2, characterized in that: The lower support fixing point (301) of the side phase conductor cross arm support insulator and the upper support fixing point (401) of the jumper support insulator on the side phase conductor cross arm are both made of silicone rubber support insulators.

9. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower according to any one of claims 1 to 7, characterized in that: The post insulator fixing points on the universal phase-changing bracket (5) are all made of silicone rubber post insulators.

10. A single-circuit tension-resistant reverse phase sequence universal phase-changing iron tower according to claim 9, characterized in that: Two side phase conductor cross arms are fixed below the middle phase conductor insulator string hanging point (7), and a universal phase-changing bracket (5) is fixed below the two side phase conductor cross arms.

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