Overhead outgoing line structure for reducing interval width of indoor transformer substation

Abstract

The utility model is suitable for the field of transformer station outgoing line interval arrangement, and discloses an overhead outgoing line structure for reducing the interval width of an indoor transformer station, a single-layer row outgoing line framework is arranged on an outgoing line platform, the row outgoing line framework is connected with the wall of a power distribution building, and two loops of overhead outgoing line leads share one outgoing line interval; double-layer outgoing lines are arranged in the outgoing line interval, A-phase, B-phase and C-phase wires are arranged in a triangular shape, the B-phase outgoing line insulator string on the upper layer is fixed on the wall of the power distribution building, and the A-phase and C-phase outgoing line insulator strings on the lower layer are fixed on the single-layer row outgoing line framework. By adopting the framework with the single stand column and reasonably arranging the relative positions of the stand columns of the framework and the equipment, the interval width of outgoing lines is only 18m, and two outgoing lines share one interval, so that the interval width of an indoor transformer substation is greatly reduced; the wall of the power distribution building is ingeniously used for installing the B-phase outgoing line strain insulator string and providing support for the outgoing line framework, investment is saved, and the stability of the framework is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of substation outgoing line interval arrangement, and particularly relates to an overhead outgoing line structure for reducing the interval width of indoor substations. Background Technique

[0002] The 220 kV overhead outgoing lines of indoor substations are usually arranged in a three-phase horizontal arrangement. Generally, the width of a 220 kV overhead outgoing line interval occupies about 13 meters. Since indoor substations pursue more compact layout and less land occupation in design, the maximum length of its 220 kV outgoing line platform is only about 80 meters. Therefore, at most six 220 kV overhead outgoing lines can be arranged in a 220 kV indoor substation.

[0003] With the development of the power grid and the rapid increase of new energy projects to be connected to the power grid, the outgoing line intervals of substations have gradually become scarce resources. How to economically and reasonably control the floor area of substations and utilize the limited space of substations to arrange more outgoing line intervals has become an urgent problem for power grid builders to solve. Content of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model proposes an overhead outgoing line structure for reducing the interval width of indoor substations.

[0005] An overhead outgoing line structure for reducing the interval width of indoor substations includes: a single-layer combined outgoing line framework is arranged on the outgoing line platform, the combined outgoing line framework is connected to the wall of the distribution building, and two overhead outgoing line conductors share one outgoing line interval;

[0006] The outgoing line interval is double-layer outgoing line. The three-phase conductors of phase A, phase B, and phase C are arranged in a triangle. The outgoing line insulator string of phase B in the upper layer is fixed on the wall of the distribution building, and the outgoing line insulator strings of phase A and phase C in the lower layer are fixed on the single-layer combined outgoing line framework.

[0007] Further specifically, in the above technical solution, the width of the outgoing line interval is 18 meters, and two outgoing lines share one interval.

[0008] Further specifically, in the above technical solution, the vertical distance between the upper layer and the lower layer is 6 meters.

[0009] Further specifically, in the above technical solution, the interval between phase A and phase C is 4 meters.

[0010] Further specifically, in the above technical solution, there are 9 outgoing lines on the outgoing line platform.

[0011] More specifically, in the above technical solution, the phase A, phase B, and phase C are respectively connected to the terminal tower through overhead outgoing wires, and every two pairs of the overhead outgoing wires are connected to both ends of one terminal tower.

[0012] More specifically, in the above technical solution, GIS outgoing terminals and outgoing line lightning arresters are provided at the connection points of the phase A, phase B, and phase C with the overhead outgoing wires, and a capacitive voltage transformer is also separately provided for the phase A.

[0013] More specifically, in the above technical solution, the wall of the distribution building is also connected with an overhead ground wire.

[0014] More specifically, in the above technical solution, the substation is a 220V fully indoor or semi-indoor substation.

[0015] Compared with the prior art, the embodiment of the present utility model has the following beneficial effects:

[0016] In this application, a row of outgoing line frameworks is arranged on a single layer of the outgoing line platform, and the row of outgoing line frameworks, the platform, and the wall of the distribution building form a firm frame structure. The width of the outgoing line interval is 18 meters, and two outgoing lines share one interval; there are double-layer outgoing lines in the interval, and the distance between the upper and lower layers is 6 meters. The upper layer is for the phase B, and the lower layer is for the phase A and phase C (the phase distance is 4 meters). The phase A, phase B, and phase C conductors are arranged in a triangle. The strain insulator string of the upper-layer phase B outgoing line is installed and fixed on the wall of the distribution building, and the strain insulator strings of the lower-layer phase A and phase C outgoing lines are installed and fixed on the single-layer steel structure frame beam. In this way, the width of the interval occupied by each 220 kV overhead outgoing line can be reduced from 13 meters to 9 meters, and the outgoing line platform of about 80 meters in the 220 kV indoor substation can be increased from arranging at most six 220 kV overhead outgoing lines to arranging at most nine outgoing lines.

[0017] This application makes clever use of the wall of the distribution building, which is used to install the strain insulator string of the phase B outgoing line and also to provide support for the outgoing line framework, saving investment and greatly improving the stability of the framework; and the overhead outgoing line structure of this application not only meets the conventional operation habits of power equipment but also meets the requirements of non-simultaneous power outage for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a floor plan of an indoor substation of the present utility model;

[0020] Figure 2 It is a GIS sectional view of the indoor substation of the present utility model;

[0021] Figure 3 It is another GIS sectional view of the indoor substation of the present utility model;

[0022] Figure 4 It is an enlarged view of a part of the floor plan layout of the indoor substation of the present utility model.

[0023] In the figure: 1. GIS outgoing terminal; 2. Outgoing line lightning arrester; 3. Combined outgoing line framework; 4. Overhead outgoing line conductor; 5. Overhead ground wire; 6. Outgoing line insulator string of phase B; 7. Terminal tower; 8. Outgoing line insulator strings of phase A and phase C; 9. Outgoing line platform; 10. Wall of the distribution building. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0026] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0027] The reference to "an embodiment" or "some embodiments" in the description of the present utility model means that specific features, structures, or characteristics described in combination with the embodiment are included in one or more embodiments of the present utility model. Thus, the statements "in an embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. appearing in different parts of this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0028] Please refer to Figures 1-4 Figures 1-4 , this application proposes an overhead outgoing line structure for reducing the interval width of an indoor substation, including: a single-layer row-connected outgoing line frame 3 is arranged on the outgoing line platform 9, the row-connected outgoing line frame 3 is connected to the wall 10 of the distribution building, and two circuits of overhead outgoing line conductors 4 share one outgoing line interval; the outgoing line interval is double-layer outgoing line, and the A-phase, B-phase, and C-phase conductors are arranged in a triangle. The outgoing line insulator string 6 of the upper-layer B-phase is fixed on the wall 10 of the distribution building, and the outgoing line insulator strings 8 of the lower-layer A-phase and C-phase are fixed on the single-layer row-connected outgoing line frame 3. The relevant electrical distances are verified under the conditions of atmospheric overvoltage, internal overvoltage, and maximum operating voltage, meeting the requirements of relevant specifications.

[0029] This application has a single-layer row-connected outgoing line frame 3 on the outgoing line platform 9, and makes the row-connected outgoing line frame 3 and the platform and the wall 10 of the distribution building form a firm frame structure. The width of the outgoing line interval is 18 meters, and two circuits of outgoing lines share one interval; the interval is double-layer outgoing line, and the distance between the upper and lower layers is 6 meters. The upper layer is for the B-phase, and the lower layer is for the A-phase and C-phase (phase distance is 4 meters). The A-phase, B-phase, and C-phase conductors are arranged in a triangle. The tension insulator string of the upper-layer B-phase outgoing line is installed and fixed on the wall 10 of the distribution building, and the tension insulator strings of the lower-layer A-phase and C-phase outgoing lines are installed and fixed on the single-layer steel structure frame beam. The used row-connected outgoing line frame 3 is single-layer, smaller in scale, simpler, and has obvious effects in saving investment and construction period. In this way, the width of the interval occupied by each 220 kV overhead outgoing line can be reduced from 13 meters to 9 meters, and the outgoing line platform 9 of about 80 meters in a 220 kV indoor substation can be increased from arranging at most six circuits of 220 kV overhead outgoing lines to arranging at most nine circuits of outgoing lines; applying the present invention to the design of a 220 kV indoor substation will increase more reserved outgoing line intervals without increasing the land occupation of the substation, providing a lot of convenience for the future development of the power system.

[0030] The row-connected frame of the 220 kV overhead outgoing line is connected to the main body of the distribution building by multiple cross beams to form a firm frame structure. Therefore, all single columns are used, and the "herringbone" frame or diagonal bracing is not used, reducing the land occupation and facilitating the shortening of relevant electrical distances.

[0031] This application makes clever use of the wall 10 of the distribution building, which is used to install the tension insulator string of the B-phase outgoing line and also to provide support for the outgoing line frame, saving investment and greatly improving the stability of the frame; and the overhead outgoing line structure of this application meets the requirements of the conventional operation habits of power equipment and the need for non-simultaneous power outage for maintenance.

[0032] Optionally, a single-layer combined outgoing line structure 3 is constructed on the 220 kV outgoing line platform 9 using Φ400 circular steel pipes, and the combined outgoing line structure 3, the platform, and the wall 10 of the distribution building form a firm frame structure. The width of the outgoing line interval is 18 meters, and two outgoing lines share one interval. By adopting a single-column structure and reasonably arranging the relative positions of the structure columns and equipment, the width of the outgoing line interval is only 18 meters.

[0033] An existing type of outgoing line interval adopts a double-layer structure with double outgoing lines, and 6 conductors of double circuits are connected. The suspension points of the conductor insulators on the outgoing line interval structure are distributed in a "△" and "▽" shape from left to right, and after the outgoing line, they are directly connected to the first-level outgoing line iron tower of the double-circuit on the same tower.

[0034] However, the phase sequence arrangements of the conductors in different intervals above are inconsistent, which does not conform to the usual operating habits and is prone to electric shock during future maintenance; and when two adjacent intervals are not shut down for maintenance at the same time, the safety clearance is too small and the maintenance conditions are poor.

[0035] Another existing solution is as follows: The three-phase outgoing line bushings of each circuit of the GIS outgoing line bushings are arranged on the substation wall in a vertical triangular layout. The outdoor pole tower includes a pole body and two groups of cross arms symmetrically arranged on the pole body. Each group of cross arms includes three cross arms arranged in parallel from top to bottom. The GIS outgoing line bushings adopt horizontal outgoing line bushings. Two phases in the same interval are arranged vertically, and the other phase is arranged vertically with one phase of the adjacent overhead outgoing line interval. The A, B, and C phases of each overhead outgoing line interval are arranged in a right-angled triangle.

[0036] However, this solution cannot arrange the open-type outgoing line lightning arrester 2 and the capacitive voltage transformer, which does not meet the requirements of relevant specifications and does not conform to the usual operating habits; and the phase sequence arrangements of the conductors in different intervals are inconsistent, which does not conform to the usual operating habits and is prone to electric shock during future maintenance; in addition, when two adjacent intervals are not shut down for maintenance at the same time, the safety clearance is too small and the maintenance conditions are poor.

[0037] In some embodiments, the width of the outgoing line interval is 18 meters; the vertical distance between the upper layer and the lower layer is 6 meters; the interval between the A phase and the C phase is 4 meters; the outgoing line is from the outgoing line platform 9.

[0038] The design and optimization of these parameters not only improve the space utilization rate and economic benefits of the substation, but also improve the operation, maintenance, and overhaul conditions of the equipment, and enhance the capacity and reliability of the power grid.

[0039] In some embodiments, the A phase, B phase, and C phase are respectively connected to the terminal tower 7 through the overhead outgoing line conductors 4, and every two overhead outgoing line conductors 4 are connected to both ends of a terminal tower 7.

[0040] It has significant advantages in aspects such as saving resources, improving space utilization rate, enhancing the stability of the power grid structure, simplifying construction and maintenance, improving the operation efficiency of the power grid, and meeting the development needs of future power grids.

[0041] In some embodiments, GIS outlet terminals 1 and outlet lightning arresters 2 are provided at the connection points of phase A, phase B, and phase C with the overhead outgoing conductor 4.

[0042] The installation of the outlet lightning arrester 2 can protect electrical equipment from lightning strikes, reduce equipment damage and power outage time caused by lightning strikes, thereby improving the safety and reliability of the power system.

[0043] The combined use of the GIS outlet terminal 1 and the lightning arrester can ensure the stable operation of the power line under harsh weather conditions such as lightning, and reduce power failures caused by external factors.

[0044] In some embodiments, the distribution building wall 10 is also connected with an overhead ground wire 5.

[0045] The overhead ground wire 5 can effectively introduce lightning current into the ground, prevent lightning from directly hitting the distribution building or other power equipment, thereby protecting the equipment from lightning damage and improving the safety of the power system.

[0046] In some embodiments, the substation is a 220V fully indoor or semi-indoor substation.

[0047] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. An overhead outgoing line structure for reducing the interval width of an indoor substation, characterized in that Including: A single-layer combined outgoing line framework is provided on the outgoing line platform, and the combined outgoing line framework is connected to the wall of the distribution building. Two overhead outgoing line conductors share one outgoing line interval. The outgoing line interval has a double-layer outgoing line. The conductors of phase A, phase B, and phase C are arranged in a triangle. The outgoing line insulator string of phase B in the upper layer is fixed to the wall of the distribution building, and the outgoing line insulator strings of phase A and phase C in the lower layer are fixed to the single-layer combined outgoing line framework.

2. The overhead outgoing line structure for reducing the interval width of the indoor substation according to claim 1, wherein The width of the outgoing line interval is 18 meters, and two outgoing lines share one interval.

3. The overhead outgoing line structure for reducing the interval width of an indoor substation according to claim 2, characterized in that, The vertical distance between the upper layer and the lower layer is 6 meters.

4. The overhead outgoing line structure for reducing the interval width of an indoor substation according to claim 3, characterized in that, The interval between phase A and phase C is 4 meters.

5. The overhead outgoing line structure for reducing the interval width of an indoor substation according to claim 1, characterized in that, Phase A, phase B, and phase C are respectively connected to the terminal tower through overhead outgoing line conductors. Every two overhead outgoing line conductors are connected to both ends of one terminal tower.

6. The overhead outgoing line structure for reducing the interval width of an indoor substation according to claim 5, characterized in that, GIS outgoing line terminals and outgoing line lightning arresters are provided at the connection points of phase A, phase B, and phase C with the overhead outgoing line conductors. A capacitive voltage transformer is also separately provided for phase A.

7. The overhead outgoing line structure for reducing the interval width of an indoor substation according to any one of claims 1-6, characterized in that An overhead ground wire is also connected to the wall of the distribution building.

8. The overhead outgoing line structure for reducing the interval width of an indoor substation according to any one of claims 1-6, characterized in that, The substation is a 220V fully indoor or semi-indoor substation.

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