CN204464916U - Layout Structure of Pole Conductors of ±800kV and ±500kV Mixed Voltage Transmission Lines on the Same Tower - Google Patents

Abstract

The utility model discloses one ± 800kV and ± 500kV with tower mixed pressure transmission line polar conductor arrangement, it comprises horizontally disposed lower floor cross-arm, the upper level of lower floor's cross-arm is provided with upper strata cross-arm, the left end of lower floor's cross-arm is connected with-500kv voltage conductor by the first V-type insulator string, the right-hand member of lower floor's cross-arm is symmetrically connected with+500kv voltage conductor by the first V-type insulator string, cross-arm top, upper strata is symmetrically arranged with two earth wire supports, two earth wire supports are all connected with ground wire, the left end of upper strata cross-arm is connected with+800kv voltage conductor by the second V-type insulator string, the right-hand member of upper strata cross-arm is symmetrically connected with-800kv voltage conductor by the second V-type insulator string.It can effectively reduce transmission line investment under the prerequisite meeting the requirements such as electromagnetic environment limit value, electric clearance, lightning protection.

Description

Layout Structure of Pole Conductors of ±800kV and ±500kV Mixed Voltage Transmission Lines on the Same Tower

technical field

The utility model relates to an arrangement structure of pole conductors of ultra-ultra-high voltage mixed-voltage transmission lines on the same tower, in particular to an arrangement structure of pole conductors of ±800kV and ±500kV same-tower mixed-voltage transmission lines.

Background technique

With the continuous and rapid development of social economy, the demand for electricity continues to rise, and the construction of power grids is also accelerated. But on the other hand, the continuous development of the economy has made land resources more tense, especially in economically developed areas, it is difficult to ensure sufficient transmission line corridor resources. Therefore, with the further improvement of the economy and construction level, it will inevitably lead to the contradiction between the increase in power demand and the shortage of resources in transmission corridors. At the same time, because the distance between the power point and the load center varies, it is more economical and reasonable to use different voltage levels for power transmission.

At present, the preliminary demonstration work of Tianguang DC transformation is being carried out. According to the system planning, the reconstruction of Tianguang DC should be combined with the transmission of hydropower in northern Myanmar. Since the hydropower transmission distance in northern Myanmar exceeds 2000km, the ±800kV UHV DC transmission scheme must be adopted. Tianguang DC is ±500kV transmission, and it is more feasible to adopt the ±800kV and ±500kV transmission scheme on the same tower in some tight corridors.

In my country, there is mature experience in single-circuit ±800kV UHVDC power transmission and ±500kV EHVDC power transmission, but there is no ready-made construction experience for UHVDC and EHVDC power transmission on the same tower at home and abroad. Compared with UHV AC transmission on the same tower and single-circuit UHVDC transmission, HVDC transmission has more technical characteristics and difficulties. The problems of the line on the environment and its own electromagnetic impact, and the line's own lightning protection are more prominent.

Therefore, it has become an important task to study the pole conductor layout scheme of ±800kV and ±500kV EHV mixed voltage transmission lines, so that UHV mixed voltage transmission lines on the same tower can meet the requirements of clearance, overvoltage protection, and electromagnetic limits. .

Contents of the invention

The purpose of this utility model is to provide a simple structure of ±800kV and ±500kV same-tower mixed-voltage transmission line electrode wire arrangement structure, which can be effective under the premise of meeting the requirements of electromagnetic environment limit value, electrical clearance, lightning protection, etc. Reduce investment in transmission lines.

In order to achieve the above purpose, the pole conductor layout structure of the ±800kV and ±500kV mixed-voltage transmission lines on the same tower designed by the utility model includes a horizontally arranged lower cross arm, and an upper horizontal arm is horizontally arranged on the upper part of the lower cross arm. The left end of the pole is connected with a -500kv voltage wire through the first V-type insulator string, the right end of the lower cross-arm is symmetrically connected with a +500kv voltage wire through the first V-type insulator string, and the upper cross-arm is symmetrically provided with two ground wire supports. The ground wires are connected to the two ground wire brackets. The two ground wires are on the same horizontal plane. The left end of the upper cross arm is connected with a +800kv voltage wire through the second V-shaped insulator string, and the right end of the upper cross arm is connected through the second V-shaped insulator string. The insulator strings are symmetrically connected with -800kv voltage conductors; +800kv voltage conductors and -800kv voltage conductors are on the same horizontal plane, -500kv voltage conductors and +500kv voltage conductors are on the same horizontal plane, and the distance between +800kv voltage conductors and -800kv voltage conductors is The pole spacing L1 is 22m, the pole spacing L2 between the -500kv voltage conductor and the +500kv voltage conductor is 17m, and the height difference h1 between the horizontal plane where the +800kv voltage conductor and -800kv voltage conductor are located and the horizontal plane where the two ground wires are located The height difference h2 between the horizontal plane where the +800kv voltage conductor and the -800kv voltage conductor are located and the horizontal plane where the -500kv voltage conductor and the +500kv voltage conductor are located is 23m.

The length of the first V-shaped insulator string is 7.5m, and the included angle a is 80°; the length of the second V-shaped insulator string is 11.5m, and the included angle b is 90°.

The advantages of the utility model are mainly reflected in the following aspects:

First, the use of ±800kV and ±500kV UHV mixed-voltage transmission lines instead of ±800kV UHV DC lines and ±500kV UHV DC lines can reduce the width of corridors, reduce housing demolition and land acquisition transmission line investment;

Second, the ±800kV UHV line is on the upper layer, and the ±500kV EHV line is on the lower layer. The arrangement of same-polarity wires on different sides can meet the requirements of electromagnetic environment limits, electrical clearances, and lightning protection.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: ground wire support 1; upper cross arm 2; second V-shaped insulator string 3; +800kv voltage wire 4; +500kv voltage wire 5; first V-type insulator string 6; -500kv voltage wire 7; lower cross arm 8; -800kv voltage wire 9.

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific examples, but the examples should not be construed as limiting the utility model.

As shown in the figure, the arrangement structure of poles and conductors of ±800kV and ±500kV mixed-voltage transmission lines on the same tower includes a horizontally arranged lower crossarm 8, and an upper horizontal arm 2 and a lower crossarm 8 are horizontally arranged on the upper part of the lower crossarm 8. The left end is connected with -500kv voltage wire 7 through the first V-shaped insulator string 6, the right end of the lower cross arm 8 is symmetrically connected with +500kv voltage wire 5 through the first V-shaped insulator string 6, and the upper cross arm 2 is symmetrically arranged with two Ground wire bracket 1, two ground wire brackets 1 are connected with ground wires, the two ground wires are on the same horizontal plane, the left end of the upper cross arm 2 is connected with +800kv voltage wire 4 through the second V-shaped insulator string 3, the upper layer The right end of the cross arm 2 is symmetrically connected to the -800kv voltage conductor 9 through the second V-shaped insulator string 3; On the same horizontal plane, the pole spacing L1 between the +800kv voltage conductor 4 and the -800kv voltage conductor 9 is 22m, the pole spacing L2 between the -500kv voltage conductor 7 and the +500kv voltage conductor 5 is 17m, and the +800kv voltage conductor 4 and The height difference h1 between the horizontal plane where the -800kv voltage wire 9 is located and the horizontal plane where the two ground wires are located is 18m, and the horizontal plane where the +800kv voltage wire 4 and the -800kv voltage wire 9 are located is the same as the -500kv voltage wire 7 and the +500kv voltage wire The height difference h2 between the horizontal planes where 5 is located is 23m.

The length of the first V-shaped insulator string 6 is 7.5m, and the included angle a is 80°; the length of the second V-shaped insulator string 3 is 11.5m, and the included angle b is 90°.

Benefit case:

If four kinds of wires are arranged at the two ends of the upper cross arm 2 and the lower cross arm 8, there are five possible ways, namely, A: the left end of the upper cross arm 2 is connected to a +800kv voltage wire through the second V-shaped insulator string 3 4. The right end of the upper cross arm 2 is symmetrically connected to a -800kv voltage wire 9 through the second V-shaped insulator string 3, respectively, the left end of the lower cross arm 8 is connected to a -500kv voltage wire 7 through the first V-shaped insulator string 6, and the lower layer The right end of the crossarm 8 is symmetrically connected to a +500kv voltage conductor 5 through the first V-shaped insulator string 6;

B: The left end of the upper cross-arm 2 is connected to the +800kv voltage conductor 4 through the second V-shaped insulator string 3, and the right end of the upper-layer cross-arm 2 is symmetrically connected to the -800kv voltage conductor 9 through the second V-shaped insulator string 3, respectively. The left end of the cross arm 8 is connected to the +500kv voltage conductor 5 through the first V-shaped insulator string 6, and the right end of the lower cross arm 8 is symmetrically connected to the -500kv voltage conductor 7 through the first V-shaped insulator string 6;

C: The left end of the upper cross-arm 2 is connected to the +500kv voltage wire 5 through the second V-shaped insulator string 3, and the right end of the upper cross-arm 2 is symmetrically connected to the -500kv voltage wire 7 through the second V-shaped insulator string 3, which are respectively the lower layer The left end of the cross arm 8 is connected with a -800kv voltage wire 9 through the first V-shaped insulator string 6, and the right end of the lower cross arm 8 is symmetrically connected with a +800kv voltage wire 4 through the first V-shaped insulator string 6;

D: The left end of the upper cross-arm 2 is connected to the +500kv voltage wire 5 through the second V-shaped insulator string 3, and the right end of the upper cross-arm 2 is symmetrically connected to the -500kv voltage wire 7 through the second V-shaped insulator string 3, respectively. The left end of the cross arm 8 is connected to a +800kv voltage wire 4 through the first V-shaped insulator string 6, and the right end of the lower cross arm 8 is symmetrically connected to a -800kv voltage wire 9 through the first V-shaped insulator string 6;

E: The left end of the upper cross-arm 2 is connected to the +800kv voltage wire 4 through the second V-shaped insulator string 3, and the right end of the upper cross-arm 2 is symmetrically connected to the -500kv voltage wire 7 through the second V-shaped insulator string 3, respectively. The left end of the cross arm 8 is connected with a -800kv voltage wire 9 through the first V-shaped insulator string 6, and the right end of the lower cross arm 8 is symmetrically connected with a +500kv voltage wire 5 through the first V-shaped insulator string 6;

According to the above parameters, the surface field strength of wires under different pole wire layouts is shown in Table 1.

Table 1 Surface field strength of wires under different pole wire layouts

According to the above parameters, the surface field strength of the ground wire is shown in Table 2 under different pole wire arrangements.

Table 2 Surface field strength of ground wires under different pole wire layouts

According to the above parameters, the maximum synthetic field strength and ion current density on the ground of the conductor under different pole conductor arrangements are shown in Table 3.

Table 3 Ground synthetic field strength and ion current density under different pole wire layouts

According to the above parameters, radio interference and audible noise are shown in Table 4 under different pole conductor arrangements.

Table 4 Radio interference and audible noise under different pole conductor arrangements

According to the above parameters, the line corridor width and the minimum ground height are shown in Table 5 under different pole conductor arrangements.

Table 5 Line corridor width and minimum height to ground under different pole conductor arrangements

According to the above parameters, the lightning tripping rate is shown in Table 6 under different pole conductor arrangements.

Table 6 Lightning tripping rate under different pole wire layout

From the calculation results in Table 1 to Table 6, it can be seen that under the E arrangement, due to the asymmetry of the wires on both sides, the surface field strengths of the quadrupole wire and the two ground wires are different, and the polar wire is on the surface of the ground wire. The induced field strength is much higher than the wire itself, therefore, the E scheme is not recommended for the wire layout. At the corresponding minimum height to the ground, the width of the corridor of mode A is about half of that of modes B, C, and D, and the layout mode of A is obviously better than all other modes. The lightning strike tripping rate of A and B layouts is the lowest. When the altitude is below 500m, the electromagnetic environment of arrangement A meets the requirements. When the altitude exceeds 500m, the audible noise of arrangement A can meet the limit requirements by changing the wire type, increasing the height of the tower, and increasing the pole spacing.

Considering the line electromagnetic environment, corridor width, and lightning protection performance comprehensively, layout A is the best.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (2)

1. one kind ± 800kV and ± 500kV is with tower mixed pressure transmission line polar conductor arrangement, it is characterized in that: it comprises horizontally disposed lower floor cross-arm (8), the upper level of described lower floor cross-arm (8) is provided with upper strata cross-arm (2), the left end of described lower floor cross-arm (8) is connected with-500kv voltage conductor (7) by the first V-type insulator string (6), the right-hand member of described lower floor cross-arm (8) is symmetrically connected with+500kv voltage conductor (5) by the first V-type insulator string (6), cross-arm (2) top, described upper strata is symmetrically arranged with two earth wire supports (1), described two earth wire supports (1) are all connected with ground wire, described two ground wires are in same level, the left end on described upper strata cross-arm (2) is connected with+800kv voltage conductor (4) by the second V-type insulator string (3), the right-hand member on described upper strata cross-arm (2) is symmetrically connected with-800kv voltage conductor (9) by the second V-type insulator string (3), described+800kv voltage conductor (4) and-800kv voltage conductor (9) are in same level, described-500kv voltage conductor (7) and+500kv voltage conductor (5) are in same level, die opening L1 between+800kv voltage conductor (4) and-800kv voltage conductor (9) is 22m, die opening L2 between-500kv voltage conductor (7) and+500kv voltage conductor (5) is 17m, difference in height h1 between the horizontal plane at+800kv voltage conductor (4) and-800kv voltage conductor (9) place and the horizontal plane at two ground wire places is 18m, difference in height h2 between the horizontal plane at+800kv voltage conductor (4) and-800kv voltage conductor (9) place and the horizontal plane at-500kv voltage conductor (7) and+500kv voltage conductor (5) place is 23m.

2. according to claim 1 ± 800kV and ± 500kV is with tower mixed pressure transmission line polar conductor arrangement, it is characterized in that: described first V-type insulator string (6) length is 7.5m, and angle a is 80 °; Described second V-type insulator string (3) length is 11.5m, and angle b is 90 °.