CN205509251U - A improved generation arrangement structure for GIS transformer substation - Google Patents

Abstract

An improved layout structure for a GIS substation, characterized in that it includes a portal frame with an upper beam and a line feed unit, the line feed unit includes a set of A, B, and C phase GIS line feed bushings, and Three hanging points are set on the upper beam for configuring the incoming line of A, B, and C phases respectively; Connect the lead wires to the corresponding incoming wires. The utility model has beneficial effects: making full use of the characteristics of the sail-type frame, integrating the traditional "one-shaped" parallel line entry into the sail-type frame, and optimizing the type of the main transformer. It solves the problem that the side-phase incoming line of the main transformer goes deep into the frame with a large back deflection angle and the electrical distance from the nearby spacer frame is tight; at the same time, it solves the problem that the traditional sail-type frame is not uniform and the structure is relatively complicated.

Description

An Improved Arrangement Structure for GIS Substation

technical field

The utility model belongs to the technical field of high-voltage power transmission and transformation, and in particular relates to an improved arrangement structure for a GIS substation.

Background technique

The 330kV of the 750kV power transmission and transformation project in Shapotou, Ningxia is planned to adopt the GIS power distribution device type. The conventional GIS power distribution device outlet bushing is parallel to the outlet beam, adopts a "line" layout, and the lateral size of the entire site is controlled by the outlet bushing, which does not make good use of the advantages of lateral distance compression of GIS equipment. In terms of electrical safety net distance The local optimization of the line will still be limited by the characteristics of the "one-line" arrangement of the outlets. Therefore, it is necessary to make fundamental changes to the "one-line" layout of the outlets.

Considering the consistency of the volume distribution of the outlet space, the optimization of the horizontal size will inevitably lead to the extension of the vertical size. Therefore, the outlet method is proposed to be optimized from the "inline" parallel arrangement to the "inline" vertical arrangement. The vertical layout method can make full use of the vertical space of the outgoing line interval, and optimize the horizontal size to the extreme, which is similar to the line outgoing line method.

The conventional "sail joint type" outlet type is to arrange the bushings perpendicular to the busbar, and the door-shaped outlet frame is equipped with three-layer outlet beams. The vertical and horizontal distances between the three-layer outlet beams are controlled by the electrical clearance. The A, B, and C three-phase lines drawn from the GIS outlet bushing can be respectively led to different outlet beams from the vertical plane. The overall visual effect of this outlet type is like a sail, connected by three layers of beams, so this outlet type is called "sail combined" outlet. See Figure 1 for details of the local layout and cross-sectional view. Preliminarily determine the horizontal, vertical and vertical dimensions of the "sail combined" frame in combination with factors such as electrical distance, equipment size, and wind deflection control. The initial selection of the dimensions in Figure 1 is shown in the table below.

Labeled in the figure Size selection (unit: mm) Remark L1 4200 phase distance control L2 4200 phase distance control L3 2500 Easy control of channels and equipment connections L4 5800 Non-stop maintenance control L5 4500 phase control L incoming line 8400 L outlet 19200 L depth 9000 H1 14000 H2 24000 H3 34000

See Figure 2 for the layout of the 330kV power distribution device arranged according to the above dimensions.

It can be seen from this that there is still room for further improvement and optimization in the conventional "sail combined" arrangement, which is specifically reflected in the following aspects:

1. The main transformer adopts a three-phase split type, the distance between the three-phase incoming lines is relatively long, the side phase deviation angle of the vertical incoming line is relatively large, and the electrical safety clearance between the nearby frames is not easy to control.

2. The reverse sail type adopted by the main transformer incoming line is different from other outgoing line structures, and the overall structure type is more complicated.

3. The two bays share a frame, and the width is restricted by the safety clearance of each bay to the frame and the safety clearance between the two bays, and there is still room for further optimization.

4. The top beam of the vertical outlet type must be higher, and the wind deflection of the down-conductor is relatively large, which will cause the longitudinal dimension of the sail frame to be elongated.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, to provide an improved layout structure for GIS substations, which can further optimize the size of the main transformer incoming line frame, and enable the incoming line frame and the outgoing line frame to share the same frame frame, thereby reducing the construction difficulty and cost of the entire substation structure layout.

In order to solve the existing technical problems, the technical solution adopted by the utility model: a GIS substation primary incoming line structure, including a portal frame with an upper beam and an incoming line unit, the incoming line unit includes a group of A, B, Phase C GIS incoming line casing, and three incoming line hanging points set on the upper beam for configuring A, B, and C phase incoming lines respectively; A, B, and C phase GIS incoming line casings are arranged in a V shape on the One side of the incoming line frame is respectively connected to the corresponding incoming line through lead-in wires.

The utility model also discloses a GIS substation multi-circuit outgoing line plus one incoming line structure, which includes a portal frame with an upper beam, a middle beam and a lower beam, an incoming line unit, and at least two outgoing line units;

The incoming line unit includes a set of A, B, and C phase GIS incoming line bushings, and three incoming line hanging points set on the upper beam for configuring A, B, and C phase incoming lines respectively; A, B, and C phases The GIS incoming line casing is set on one side of the incoming line frame in a V shape and connected to the corresponding incoming line through the lead wires;

The outlet unit includes a set of A, B, C phase GIS outlet bushings, and a set of outlet hanging points respectively set on the upper beam, middle beam and lower beam for configuring A, B, and C phase outlets; each group A , Phase B, and Phase C GIS outlet bushings are respectively connected to corresponding outlets through down conductors.

Preferably, composite insulators for fixing down-conductors on one side are also provided on the hanging points of outgoing lines on the middle beam and the lower beam.

Preferably, the number of outlet units is two.

Preferably, the height of the upper beam does not exceed 30m, the height of the middle beam does not exceed 21m, and the height of the lower beam does not exceed 12m; the horizontal distance between the three beams does not exceed 3.5m.

Preferably, the longitudinal dimension of the portal frame does not exceed 7m, and the transverse dimension does not exceed 27m.

The beneficial effect that the utility model has:

1. Make full use of the characteristics of the sail structure, integrate the traditional "one-shaped" parallel incoming line into the sail structure, and optimize the type of the main transformer. It solves the problem that the side-phase incoming line of the main transformer goes deep into the frame with a large back deflection angle and the electrical distance from the nearby spacer frame is tight; at the same time, it solves the problem that the traditional sail-type frame is not uniform and the structure is relatively complicated.

2. Fully combining the number of outgoing lines of Shapotou 330kV, combining the intervals of the outgoing lines and main transformer incoming lines, various beam widths can be arranged, so that the overall layout is symmetrical and beautiful, and the horizontal size can be further compressed.

3. Use post composite insulators to fix the down-conductor, which solves the problems of long longitudinal distance caused by wind deflection of the down-conductor and difficulty in hoisting the bushing, and further compresses the longitudinal dimension and the beam height of the sail-type outlet frame. Compared with the traditional sail-type scheme, the beam height is reduced from 32m to 30m, and the longitudinal dimension is compressed from 9m to 7m.

4. The improved "sail combined" outgoing line can complete the phase change in the station so as to flexibly cooperate with the line.

5. Through the above optimization, the improved "sail joint type" outlet frame is further reduced in terms of floor area, frame steel volume and investment cost compared with the traditional sail type scheme.

Description of drawings

Figure 1(a) is a top view of the traditional "sail united" local layout;

Fig. 1(b) is a cross-sectional view of the traditional "sail united" partial plane layout;

Figure 2 is a schematic diagram of the layout of the traditional "sail combined" overall power distribution device;

Fig. 3 is a schematic diagram of the structure of the incoming main transformer of the utility model;

Fig. 4 is a schematic structural diagram of a framework shared by four circuits of the utility model;

Fig. 5 is a three-dimensional view of a frame structure shared by two outgoing lines and one main transformer incoming line of the utility model;

Fig. 6 is a structural schematic diagram of the utility model sharing a frame with two outgoing lines and one main transformer incoming line;

Fig. 7 is a schematic diagram of checking the longitudinal dimension of the door frame and outlet arrangement of the utility model;

Fig. 8 is a diagram of a partial method of outlet line arrangement in Fig. 6;

Fig. 9 is a schematic diagram of a layout of an overall power distribution device after optimization and improvement.

Reference signs: 1. portal frame; 2. upper beam; 3. middle beam; 4. lower beam; 5. A, B, C phase GIS incoming bushing; 6A, B, C phase GIS emerging bushing; 7. Composite insulator.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described. The following examples are only used to illustrate the technical solution of the utility model more clearly, but not to limit the protection scope of the utility model.

On the basis of making full use of the sail-type structure, the traditional "one-shaped" parallel incoming line method is integrated into the sail-type structure to optimize the main transformer incoming line type. As shown in Figure 3, a GIS substation primary incoming line structure includes a portal frame 1 with an upper beam 2 and an incoming line unit. The incoming line unit includes a set of A, B, and C phase GIS incoming line bushings 5, and three incoming line hanging points arranged on the upper beam 2 for configuring phase A, B, and C phase incoming lines respectively. A, B, and C phase GIS inlet bushings 5 are arranged on one side of the inlet frame, wherein the B phase GIS inlet bushing is close to the portal frame 1, and the A phase GIS inlet bushing and the C phase GIS inlet bushing The pipes are located on both sides of the B-phase GIS inlet bushing and away from the portal frame 1, so that the central line of the three inlet bushings presents a V shape. Each incoming line sleeve is respectively connected to the corresponding incoming line through the lead-in wire.

This type of incoming line sets the incoming line hanging points on the upper beam 2 in a row, instead of setting the incoming line hanging points inside the sail-shaped frame like the traditional sail-type main transformer side phase, and the side phases are led out through tension strings. The safety net distance between the main transformer incoming line and the adjacent interval down-conductor is limited by the length of the tension string; at the same time, there is no need to adopt a reverse sail structure, and it is still consistent with other outgoing line interval frame types, which solves the problem of the traditional sail structure The overall disunity and complex structure of the problem.

As shown in Figure 4, a GIS substation four-circuit outlet structure includes a portal frame 1 with an upper beam 2, a middle beam 3 and a lower beam 4, and four outlet units. Each outgoing line unit includes a set of outgoing line hanging points respectively set on the upper beam 2, middle beam 3 and lower beam 4 for configuring A, B, and C phase outgoing lines, and a set of hanging points coplanar with the set of outgoing line hanging points A, B, C phase GIS outlet casing 6. Each outgoing line casing is connected to the corresponding outgoing line through a down conductor, and the four sets of outgoing line hanging points share a portal frame 1 . The outlet casing is located below the hanging point of the outlet, and its positional relationship and arrangement are the same as those in Figure 1.

The distance verification results between the various devices of this layout type are as follows:

According to the above calculation results, combined with the requirements of the civil structure, the L4 distance is adjusted to 6m, and the beam width of the four-circuit outgoing line sharing a frame is selected as 34m.

As shown in Figures 5 and 6, a GIS substation with two outgoing lines and one incoming line structure includes a portal frame 1 with an upper beam 2, a middle beam 3 and a lower beam 4, an incoming line unit, and at least Two outgoing units.

The incoming line unit includes a set of A, B, and C phase GIS incoming line bushings 5, and three incoming line hanging points set on the upper beam 2 for configuring A, B, and C phase incoming lines respectively. A, B, and C phase GIS inlet bushings 5 are arranged on one side of the inlet frame, wherein the B phase GIS inlet bushing is close to the portal frame 1, and the A phase GIS inlet bushing and the C phase GIS inlet bushing The pipes are located on both sides of the B-phase GIS inlet bushing and away from the portal frame 1, so that the connection of the three inlet bushings presents a V shape. Each inlet bushing is respectively connected to the corresponding inlet wire through the lead-in wire.

The outgoing line unit includes a group of outgoing line hanging points respectively arranged on the upper beam 2, middle beam 3 and lower beam 4 for configuring the outgoing lines of A, B, and C phases, and a group of A, B, phase C GIS outlet casing 6. Each outgoing line casing is connected to the corresponding outgoing line through a down conductor, and two sets of outgoing line hanging points share a portal frame 1 . The outlet casing is located below the hanging point of the outlet, and its positional relationship and arrangement are the same as those in Figure 1.

The distance verification results between the various devices of this layout type are as follows:

As shown in Figure 7 and Figure 8, in order to strictly control the wind deflection and further compress the longitudinal distance of the frame, composite insulators for fixing the down-conductors on one side are also installed on the outlet hanging points on the middle beam 3 and the lower beam 4 respectively. 7. Combined with the electrical distance verification, the longitudinal distance can be controlled at 3.5m, which is the horizontal distance between the three-story beams on the portal frame 1. After the longitudinal dimension is determined to be 3.5m, the distance between the GIS and the arrester remains unchanged at 4.5m. At this time, the position of the GIS casing can avoid the entire triangular range of the frame, and there is no problem of hoisting the GIS casing. Controlled by the electrical safety net distance, the elevation of the lower beam 4 should be 12m, and the elevations of the middle layer and the upper beam 2 should be 21m and 30m respectively.

As shown in Figure 9, an optimized and improved planar layout structure of the overall power distribution device fully combines the number of 330kV outgoing lines in Shapotou, and combines the intervals between outgoing lines and main transformer incoming lines, and arranges three beam widths: four circuits The outgoing line structure (referred to as four circuits), the structure of two outgoing lines plus one main transformer incoming line structure (abbreviated as three circuits), and the single main transformer incoming line structure (abbreviated as one circuit). The three beam widths are centered on the single-circuit structure at the position of the double-busbar section, and the east and west sides adopt the "four-circuit + three-circuit + four-circuit" layout, and the overall layout is symmetrical and beautiful. Compared with the traditional sail-type scheme, the optimization indicators of the improved "sail-combined" type based on 330kV power distribution device are shown in the table below.

It can be seen from the above table that the improved "sail joint type" outlet frame has a 4.1% reduction in area and a 24.4% reduction in the amount of frame steel compared with the traditional sail type scheme; a total investment of 422,400 yuan has been saved.

In the present utility model, A, B, and C phase GIS inlet bushings 5 refer to A phase GIS inlet bushings, B phase GIS inlet bushings and C phase GIS inlet bushings; Line hanging point refers to the hanging point of A phase incoming line, the hanging point of B phase incoming line and the hanging point of C phase incoming line. In the same way, the same is true for the A, B, and C phase GIS outgoing line bushings 6 and the A, B, and C phase outgoing line hanging points, and will not be described again.

The above description is only the preferred embodiment of the utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and deformations can also be made. And deformation should also be regarded as the protection scope of the present utility model.

Claims (6)

1. a GIS transformer station one is back into line structure, it is characterized in that: include a gate framework with upper beam and a wire inlet unit, wire inlet unit includes one group of A, B, C phase GIS entrance bushing, and three are arranged on upper beam the inlet wire hanging point being respectively used to configure A, B, C phase inlet wire；A, B, C phase GIS entrance bushing be in the shape of the letter V be arranged on inlet wire framework side and respectively by drawing reach the standard grade be connected to correspondence inlet wire.

2. a GIS transformer station returns back out line more and adds one back into line structure, it is characterised in that: include a gate framework with upper beam, central sill and underbeam, a wire inlet unit, and at least two outgoing line unit；

Wire inlet unit includes one group of A, B, C phase GIS entrance bushing, and three are arranged on upper beam the inlet wire hanging point being respectively used to configure A, B, C phase inlet wire；A, B, C phase GIS entrance bushing be in the shape of the letter V be arranged on inlet wire framework side and respectively by drawing reach the standard grade be connected to correspondence inlet wire；

Outgoing line unit includes one group of A, B, C phase GIS outlet casing tube, and one group is separately positioned on upper beam, central sill and underbeam the outlet hanging point being respectively used to configure A, B, C phase outlet；Often organize A, B, C phase GIS outlet casing tube and be connected to the outlet of correspondence respectively by downlead.

A kind of GIS transformer station the most according to claim 2 returns back out line more and adds one back into line structure, it is characterised in that be additionally provided with the composite insulator for fixing its side downlead on the outlet hanging point on central sill and underbeam.

A kind of GIS transformer station the most according to claim 3 returns back out line more and adds one back into line structure, it is characterised in that the quantity of outgoing line unit is two.

A kind of GIS transformer station the most according to claim 4 returns back out line more and adds one back into line structure, it is characterised in that upper depth of beam is less than 21m less than 30m, middle depth of beam, and lower depth of beam is less than 12m；Horizontal range between three beams is less than 3.5m.

A kind of GIS transformer station the most according to claim 5 returns back out line more and adds one back into line structure, it is characterised in that the longitudinal size of gate framework is less than 7m, and lateral dimension is less than 27m.