A single bay three-circuit outgoing line arrangement structure for HGIS power distribution device

Abstract

The present invention provides a single-bay three-circuit outgoing line layout structure for an HGIS power distribution device, belonging to the technical field of power supply and distribution of electric power systems. It solves the problem of insufficient space utilization in the bay outgoing line layout of conventional 750kV substations. The structure comprises a 3 / 2 circuit breaker connection section and a double circuit breaker connection section, which are arranged in the same bay and share one busbar and a second busbar. The 3 / 2 circuit breaker connection section includes two incoming and outgoing lines, and the double circuit breaker connection section includes one selectable incoming and outgoing line. All HGIS circuit breaker units in the 3 / 2 circuit breaker connection section and the double circuit breaker connection section are arranged sequentially in the same direction within the space of the same bay. While ensuring the electrical safety and operational convenience of the 750kV power distribution device, the present invention does not increase the engineering workload of the related steel structure frame, can effectively reduce the footprint of the power distribution device of a 750kV substation with an odd number of incoming and outgoing lines, and improve economic efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply and distribution of electric power systems, and is applied to a substation in the form of HGIS equipment, specifically a single-bay three-circuit outgoing line arrangement structure of an HGIS power distribution device. Background Art

[0002] In the field of power supply and distribution, the industry's 750kV substations often use metal semi-enclosed switchgear, which integrates other equipment besides the busbar, such as circuit breakers, disconnectors, current transformers, etc., into an SF6-insulated metal casing and connects them to the busbar or outgoing lines through bushings. The power equipment formed in this way is referred to as HGIS equipment.

[0003] In a 750kV substation, the distribution equipment often adopts a 3 / 2 circuit breaker wiring scheme, that is, 3 circuit breakers are used for 2 outgoing lines, and an average of 1.5 circuit breakers are used for each outgoing line; in the 3 / 2 circuit breaker wiring scheme, the circuit breaker connected to the busbar side is called the side circuit breaker, and the circuit breaker located in the middle is called the middle circuit breaker.

[0004] In the prior art, the 3 / 2 circuit breaker wiring scheme can be divided into the following schemes: 3+0, 2+1, and 1+1+1, depending on the number of HGIS device circuit breakers arranged together in a string. The 3+0 scheme is: three circuit breakers are arranged together, and the circuit breaker and two side breakers share the outgoing bushings, for a total of four sets of outgoing bushings per string of equipment. The 2+1 scheme is: two circuit breakers are arranged together, and the circuit breaker and one of the side breakers share the outgoing bushings, for a total of five sets of outgoing bushings per string of equipment. The 1+1+1 scheme is: each circuit breaker is arranged separately, and the circuit breaker and side breakers do not share the outgoing bushings, for a total of six sets of outgoing bushings per string of equipment.

[0005] For the distribution equipment of a 750kV substation, in the 3 / 2 circuit breaker wiring scheme, when the total number of incoming and outgoing lines is an odd number, given that the current operating unit has high requirements for the reliability of the main transformer wiring, after the 3 / 2 circuit breaker wiring scheme is connected in series, the remaining 1-circuit outgoing line or main transformer incoming line adopts a double circuit breaker method of connecting to two busbar sections respectively, which is equivalent to using two circuit breakers for the incoming and outgoing line.

[0006] For a 750kV substation with three main transformers, if the scale of the 750kV line outgoing line is an even number, in order to ensure the reliability of the main transformer, the main transformers are all connected in series or through double circuit breakers; after each main transformer is connected in series with the 750kV outgoing line, the number of remaining 750kV outgoing line loops is an odd number. When the 3 / 2 circuit breaker wiring scheme is adopted, each complete string can only connect to two 750kV outgoing lines, and there must be one 750kV outgoing line left alone, and a complete string cannot be formed. For this situation, the conventional practice in the existing technology is to connect the outgoing line to two bus sections through double circuit breakers; therefore, this approach will also occupy a complete 750kV outgoing line interval.

[0007] At the same time, the layout structure of conventional HGIS equipment adopts a double-layer structure scheme. The 750kV main transformer incoming line and busbar structure adopt a low-layer structure, and the 750kV outgoing line and the cross-line into the string adopt a high-layer structure. The main transformer can be connected to the corresponding string through the low-layer structure outside the distribution device, and then led up to the high-layer structure cross-line through jumpers, and then connected to the HGIS equipment bushing position in the string.

[0008] In summary, existing 750kV substation HGIS equipment technology features multiple bays in the HGIS layout, with each bay housing only three sets of circuit breakers in a 3 / 2 connection, or two sets of circuit breakers in a double-breaker connection. Consequently, for substations with an odd number of incoming and outgoing lines, the space beneath the main transformer's lower structure is underutilized. Furthermore, using a double-breaker connection for the last outgoing line bay at the end also results in insufficient space utilization. These bays, despite being underutilized, present a problem that cannot be eliminated using existing technology. Consequently, the conventional HGIS equipment layout, when the total number of incoming and outgoing lines is odd, leads to insufficient distribution equipment space utilization. This issue impacts substation design, construction, operation, and maintenance, hindering economic efficiency and, at a macro level, hindering the development and growth of power supply and distribution technology as a whole. Substations themselves occupy a large area and carry high economic costs. Therefore, improving substation structure space utilization to achieve optimal efficiency is a pressing issue in power system development. Summary of the Invention

[0009] In order to solve the space utilization problem mentioned in the background technology, the present invention proposes a single-bay three-circuit outgoing line layout structure for HGIS equipment distribution devices in 750kV substations. While ensuring the electrical safety and operation and maintenance convenience of the 750kV distribution device, it does not increase the engineering workload of the related steel structure frame. By arranging a complete 3 / 2 wiring string and a complete double-circuit breaker wiring unit in a single 750kV HGIS equipment distribution device bay, the purpose of a single-bay three-circuit outgoing line is achieved, thereby effectively reducing the footprint of the 750kV substation distribution device with an odd total number of incoming and outgoing lines, thereby reducing the engineering construction investment cost and improving economic benefits.

[0010] The present invention adopts the following technical solutions to achieve the purpose:

[0011] A single-bay, three-circuit outgoing line arrangement structure for an HGIS power distribution device includes a 3 / 2 circuit breaker connection section and a double circuit breaker connection section, which are arranged in the same bay and share a busbar and a second busbar. The 3 / 2 circuit breaker connection section includes two incoming and outgoing lines; the double circuit breaker connection section includes one selectable incoming and outgoing line. All HGIS circuit breaker units in the 3 / 2 circuit breaker connection section and the double circuit breaker connection section are sequentially arranged in the same direction within the space of the bay.

[0012] The above scheme is applicable to a typical 750kV HGIS substation with an odd number of incoming and outgoing lines. It has multiple outgoing line bays. Except for some bays that adopt the single-bay three-circuit outgoing line arrangement of the above scheme, the remaining bays can normally adopt the traditional 3 / 2 circuit breaker wiring scheme. For example, the first outgoing line bay is occupied by the main transformer incoming line and the eastward outgoing line, a total of two incoming and outgoing lines, and the second outgoing line bay adopts a single-bay three-circuit outgoing line arrangement.

[0013] Furthermore, the two incoming and outgoing lines of the 3 / 2 circuit breaker connection part include a first main transformer incoming line and a first line outgoing line; the HGIS circuit breaker unit of the 3 / 2 circuit breaker connection part includes a mother side circuit breaker, two mother side circuit breakers and a circuit breaker; the first main transformer incoming line is connected to a position between the two mother side circuit breakers and the circuit breaker; the first line outgoing line is connected to a position between a mother side circuit breaker and the circuit breaker, and is connected to a variety of outgoing line devices, such as PT, lightning arrester and high-voltage reactor, for outgoing line.

[0014] Furthermore, the one selectable incoming and outgoing line includes the second main transformer incoming line or the second line outgoing line; the HGIS circuit breaker unit of the dual circuit breaker connection part includes a mother-side circuit breaker and a second mother-side circuit breaker; the one selectable incoming and outgoing line is connected between the first mother-side circuit breaker and the second mother-side circuit breaker.

[0015] Specifically, an HGIS outlet bushing is further provided on the connection line between the HGIS circuit breaker unit and the incoming and outgoing lines.

[0016] Specifically, an HGIS branch pipeline is further provided on the connection line between the HGIS outlet bushing and the HGIS circuit breaker unit; a plurality of bending modules are provided on the HGIS branch pipeline; in the 3 / 2 circuit breaker connection part, the HGIS circuit breaker unit adopts line-side outlet, and the layout scheme is semi-C-shaped, where the outlet position of the primary circuit breaker and the circuit breaker is connected, and is connected to the outlet position outside the busbar through the HGIS branch pipeline, and then the outlet is carried out through the HGIS outlet bushing; the HGIS outlet bushing is aligned with the HGIS circuit breaker unit, and the HGIS branch pipeline realizes semi-C-shaped bending and bending of the road inside the station through horizontal bending and vertical bending.

[0017] In the 3 / 2 circuit breaker connection part, the HGIS circuit breaker unit can adopt the 3+0, 2+1, and 1+1+1 schemes, and the 2+1 scheme is preferred because compared with the 1+1+1 scheme, this scheme can save one set of 750kV HGIS outgoing line bushings and has better maintenance flexibility than the 3+0 scheme.

[0018] Specifically, the HGIS outlet bushing includes a first-mother side HGIS outlet bushing and a second-mother side HGIS outlet bushing provided in both the 3 / 2 circuit breaker connection part and the double circuit breaker connection part, and also includes a double circuit breaker HGIS outlet bushing provided only in the double circuit breaker connection part.

[0019] Furthermore, the first main transformer incoming line, the second main transformer incoming line, the first line outgoing line and the second line outgoing line are all supported by a layered steel frame, and the layered steel frame includes a low-level frame and a high-level frame; the steel beam direction of the low-level frame is parallel to the arrangement direction of the HGIS circuit breaker unit, and the low-level frame is used to carry the first main transformer incoming line, the second main transformer incoming line, the first busbar and the second busbar; the steel beam direction of the high-level frame is perpendicular to the arrangement direction of the HGIS circuit breaker unit, and the high-level frame is used to carry the first line outgoing line, the second line outgoing line and the cross-line.

[0020] Specifically, one of the optional incoming and outgoing lines in the dual circuit breaker wiring part is the second main transformer incoming line, which is mounted under the steel beam of the low-rise structure, and the incoming direction of the second main transformer incoming line is perpendicular to the arrangement direction of the HGIS circuit breaker unit; the dual circuit breaker HGIS outlet bushing is arranged at the common end between the first mother-side circuit breaker and the second mother-side circuit breaker, and the second main transformer incoming line is connected to the first mother-side circuit breaker and the second mother-side circuit breaker through the dual circuit breaker HGIS outlet bushing.

[0021] Specifically, one of the selectable incoming and outgoing lines in the dual circuit breaker wiring part is the second line outgoing line, which is mounted under the steel beam of the high-rise structure, and the outgoing direction of the second line outgoing line is parallel to the arrangement direction of the HGIS circuit breaker unit; the dual circuit breaker HGIS outgoing line bushing is arranged at the end of the first mother-side circuit breaker away from the second mother-side circuit breaker, and the second line outgoing line is connected to the dual circuit breaker HGIS outgoing line bushing; the end of the second mother-side circuit breaker away from the first mother-side circuit breaker is connected to the second bus through the second mother-side HGIS outgoing line bushing, and the end of the second mother-side circuit breaker close to the first mother-side circuit breaker is connected to the dual circuit breaker HGIS outgoing line bushing through the HGIS branch pipeline; a mother-side HGIS outgoing line bushing is arranged between the first mother-side circuit breaker and the second mother-side circuit breaker, and the mother-side HGIS outgoing line bushing is connected to the end of the first mother-side circuit breaker close to the second mother-side circuit breaker.

[0022] Specifically, in the connection part of the double circuit breaker, when the optional incoming and outgoing line of one circuit is the second line outgoing line, the second main transformer incoming line is not mounted under the corresponding low-rise frame, but a transition bus is mounted instead; the transition bus is connected to a bus through a cross-line, and the transition bus is also connected to an end of a bus-side circuit breaker close to the second bus-side circuit breaker through a bus-side HGIS outgoing bushing.

[0023] In summary, in the single-bay three-circuit outgoing line arrangement structure, the outgoing line of the dual circuit breaker wiring part can adapt to two different modes of main transformer incoming line and line outgoing line according to actual needs, thereby achieving the effect of the dual circuit breaker wiring part taking on the incoming and outgoing line of one circuit, while optimizing space utilization.

[0024] In the double circuit breaker connection part, the HGIS circuit breaker unit can adopt 2+0 or 1+1 scheme, preferably 2+0 scheme, which can save one set of 750kV HGIS outgoing line bushings.

[0025] In summary, due to the adoption of this technical solution, the beneficial effects of the present invention are as follows:

[0026] The present invention utilizes a single-bay, three-circuit layout, effectively utilizing the unused space beneath the lower structure of the main transformer incoming lines of a 750kV HGIS distribution system. This layout shifts the dual circuit breaker connections from occupying a single, complete 750kV HGIS distribution system bay to being consolidated into a single bay within the 3 / 2 wiring string of the main transformer incoming lines, while ensuring electrical safety and space planning. This arrangement allows the main transformer incoming line bay to house both a complete 3 / 2 wiring string and dual circuit breaker wiring units, saving the footprint of an entire bay without incurring additional investment or reconstruction costs. Therefore, the present invention is widely applicable to HGIS substations with an odd number of 750kV distribution system incoming and outgoing lines, significantly improving economic efficiency. During substation expansion, there is no need to re-analyze and expand the area required for new bays. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the connection structure of the single-bay three-circuit outgoing line arrangement of the present invention;

[0028] Figure 2 Schematic diagram of the structural connection of a traditional substation;

[0029] Figure 3 Plan of the traditional substation layout;

[0030] Figure 4 for Figure 3 Layout structure section at the middle AA position;

[0031] Figure 5 A plan view of the wiring arrangement of a 3 / 2 circuit breaker according to the present invention;

[0032] Figure 6 A plan view of the wiring arrangement structure of a double circuit breaker according to the present invention;

[0033] Figure 7 This is a plan view of the layout structure when the main transformer incoming line solution is adopted in the present invention;

[0034] Figure 8 for Figure 7 Layout structure cross section at the middle BB position;

[0035] Figure 9 This is a plan view of the layout structure when the line outlet solution is adopted in the present invention;

[0036] Figure 10 for Figure 9 Cross-section of the layout structure at the center CC position.

[0037] The meanings of the symbols in the accompanying drawings are as follows:

[0038] 11-Circuit breaker on the first bus side, 12-Circuit breaker, 13-Circuit breaker on the second bus side, 14-Post insulator, 15-Bus, 16-HGIS outlet bushing on the first bus side, 17-HGIS outlet bushing on the second bus side, 18-HGIS branch pipeline, 19-HGIS outlet bushing for double circuit breakers, 21-Circuit breaker on the first bus side, 22-Circuit breaker on the second bus side, 23-Flying line, 31-Low-rise structure, 32-High-rise structure, 41-Bus, 42-Bus, 43-Main transformer incoming line, 44-Line outgoing line, 45-Jumper, 46-Down conductor, 47-Transition bus, 51-Transport road intersection. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0041] In order to more clearly illustrate the difference between the layout of this embodiment and the traditional layout, the layout of the traditional HGIS substation is first introduced in detail.

[0042] like Figure 2 As shown in the figure, a traditional 750kV substation is equipped with three main transformers, which can be numbered as #1, #2, and #3. There are six 750kV outgoing lines 44, three of which are eastbound and three are westbound. Therefore, the total number of incoming and outgoing lines of the substation is nine, an odd number. All three westbound lines are equipped with high-voltage shunt reactors. Figure 2 In the 3 / 2 circuit breaker connection scheme adopted by the 750kV distribution device, the three main transformers are respectively connected to the first, second and third bays of the 750kV distribution device, and each corresponds to one line outgoing line 44.

[0043] After the three main transformers are connected in series with the three outgoing line lines 44, two of the remaining three outgoing line lines 44 are connected in series and arranged in the fourth compartment; the remaining single outgoing line line 44 is arranged in the fifth compartment through a double circuit breaker wiring method.

[0044] The detailed structural plan of the above conventional arrangement can be found in Figure 3 Indication; Figure 4 In the cross section, it can be seen that the main transformer is connected to the corresponding string through the low-level structure 31 outside the distribution device, and then led up to the jumper 23 of the high-level structure 32 through the jumper 45, and connected to the bushing position of the HGIS equipment in the string.

[0045] Therefore, conventional HGIS layouts only accommodate three circuit breaker groups per string in a 3 / 2 configuration, or two circuit breaker groups in a double-breaker configuration, within each bay. For substations with an odd number of incoming and outgoing lines, the space beneath the lower structure of the main transformer incoming line (e.g., #3) is underutilized. Double-breaker wiring is also used for the last outgoing line bay at the end, resulting in insufficient space utilization. Conventional HGIS layouts underutilize the distribution equipment space when the total number of incoming and outgoing lines is odd.

[0046] Example 1

[0047] This embodiment specifically introduces the single-bay three-circuit inlet and outlet line arrangement structure of the present invention.

[0048] like Figure 1 As shown, a single-bay three-circuit outgoing line arrangement structure of an HGIS power distribution device includes a 3 / 2 circuit breaker connection section and a double circuit breaker connection section arranged in the same bay and sharing a busbar 41 and a second busbar 42; the 3 / 2 circuit breaker connection section includes two incoming and outgoing lines; the double circuit breaker connection section includes one optional incoming and outgoing line; all HGIS circuit breaker units in the 3 / 2 circuit breaker connection section and the double circuit breaker connection section are arranged sequentially in the same direction inside the space of the bay.

[0049] See Figure 1 For example, Figure 1 The second bay in the circuit breaker system includes 5 HGIS circuit breaker units, which are arranged in the same direction. Figure 1 The position in is drawn to facilitate the representation of the connection relationship. Figure 8 or Figure 10 For cross-section, refer to the arrangement of HGIS circuit breaker units. Figure 1 In the dual circuit breaker connection section, the #1 main transformer incoming line and the eastward outgoing line 4 cannot exist at the same time, but can only exist in a selective manner. The example in the figure shows that the connection points of these two incoming and outgoing lines are both located at the same position in the dual circuit breaker connection section. This embodiment describes the situation when the #1 main transformer incoming line exists. At this time, the substation includes 3 main transformer incoming lines and 6 line outgoing lines 44, a total of 9 incoming and outgoing lines.

[0050] like Figure 8 As shown, in this embodiment, one optional incoming and outgoing line used in the double circuit breaker connection part is the main transformer incoming line 43; Figure 8In the HGIS power distribution device area, a layered steel frame is set up, including a low-level frame 31 and a high-level frame 32. A single-bay three-circuit outgoing line structure is equipped with a total of 4 low-level frames 31 and 4 high-level frames 32; the low-level frame 31 is parallel to the Figure 8 In the cross-section direction, from left to right along the BB section, they are: a mother frame, #2 main transformer incoming line frame, a second mother frame, and #1 main transformer incoming line frame.

[0051] High-rise frame 32 is perpendicular to Figure 8 In the cross-section direction, the hanging points of the left and right outermost high-rise frames 32 can be used to hang the 750kV line outgoing wires 44, and the remaining high-rise frame hanging points are used to hang the cross-line 23.

[0052] An insulator string hanging point is provided at the bottom of the beam of the lower frame 31 for vertical Figure 8 The main transformer incoming line in the cross-section direction; V-type insulator strings or I-type insulator strings can also be used, combined with a soft busbar for suspending split conductors.

[0053] The specific arrangement structure of the 3 / 2 circuit breaker connection part in this embodiment is introduced below.

[0054] For the 3 / 2 circuit breaker connection, a 2+1 layout is recommended for HGIS circuit breaker units. Within this bay, the first busbar-side circuit breaker 11 and the second busbar-side circuit breaker 12 are placed between the first busbar frame and the main transformer incoming line frame, while the second busbar-side circuit breaker 13 is placed within the second busbar frame. In the 3 / 2 connection, the two second busbar-side HGIS outgoing bushings 17 are connected using support insulators 14 and a supporting tube busbar 15.

[0055] A 3+0 arrangement scheme can also be adopted, in which three circuit breakers are arranged together. The position of the HGIS outlet bushing 16 on the one bus side remains unchanged. In this case, the HGIS outlet bushings 17 on the two bus sides are combined into one. The position of one of the HGIS outlet bushings 17 on the two bus sides will be moved to the left by about the length of a circuit breaker unit. Then, the busbar 15 is supported by the support insulator 14, and the position of the HGIS outlet bushing 17 on the two bus sides is led to the bottom of the two bus frame that suspends the two busbars 42.

[0056] Regardless of whether the HGIS circuit breaker unit adopts a 2+1 or 3+0 layout scheme, a mother-side outlet position between a mother-side circuit breaker 11 and a circuit breaker 12 needs to be connected to a mother-side HGIS outlet bushing 16 position through an HGIS branch line 18. The HGIS branch line 18 is arranged in a semi-C shape on the plan view, and is led from a mother-side outlet position to a mother-side HGIS outlet bushing 16 position. Figure 5 According to the layout requirements, the HGIS branch pipeline 18 needs to adopt horizontal and vertical bending modules to cross the station transportation road intersection 51. Figure 5 The schematic diagram shows the specific connection mode of the HGIS branch pipeline 18 in the interval in a plan view.

[0057] The HGIS outlet bushing 16 on the mother side connects to the outlet equipment (PT, lightning arrester, high-voltage reactor, etc.) through the busbar 15 or split conductors. The 750kV outlet is connected to the 750kV outlet equipment's connecting busbar through jumpers 45 connected to the tension insulator strings at the end of the high-rise structure and down conductors 46 connected to the suspension insulator strings at the bottom.

[0058] The first busbar-side HGIS outlet bushing 16 is connected to the first busbar 41 via a busbar-mounted suspension tube busbar and down conductor 46. The #2 main transformer incoming line utilizes the #2 main transformer incoming line frame's suspension tube busbar, with split conductors leading down to interconnected conductor segments (which can be bushing terminals or any location on the tube busbar 15) on the second busbar-side HGIS outlet bushing 17. The second busbar-side HGIS outlet bushing 17 is connected to the second busbar 42 via the second busbar-mounted suspension tube busbar and down conductor 46.

[0059] The specific arrangement structure of the dual circuit breaker connection part in this embodiment is introduced below.

[0060] In this embodiment, the layout structure of the double circuit breaker HGIS is the main transformer incoming line scheme, which can be referred to Figure 6 The right part and Figure 7 、 Figure 8 .

[0061] For main transformer incoming lines with dual circuit breakers, a vertical HGIS circuit breaker incoming line solution is recommended. A 2+0 HGIS circuit breaker unit solution is recommended. The primary and secondary circuit breakers 21 and 22 of the HGIS circuit breaker unit are arranged together within the #1 main transformer incoming line frame. The dual-circuit-breaker HGIS outgoing line bushing 19 is located approximately directly below the #1 main transformer incoming line frame. The #1 main transformer is connected to the dual-circuit-breaker HGIS outgoing line bushing 19 via a V-shaped insulator string and a suspension tube primary incoming line at the bottom of the #1 main transformer incoming line frame beam, and via a split conductor down conductor 46. The dual-circuit-breaker HGIS outgoing line bushing 19 is arranged in the middle of the three bushings, with the primary circuit breaker 21 on the right and the secondary circuit breaker 22 on the left.

[0062] In the dual circuit breaker connection section, the HGIS outlet bushing 17 on the second bus side is supported by the tubular busbar 15 through the support insulator 14, and is led below the suspended second busbar 42. The HGIS outlet bushing 17 on the second bus side is connected to the second busbar 42 through the suspended tubular busbar of the second bus frame and the down conductor 46.

[0063] In the dual circuit breaker connection section, a female-side HGIS outlet bushing 16 is connected to the external busbar 15 via a support insulator 14. The HGIS position for the dual circuit breaker connection can also be adjusted to the right, so that the support insulator and the tube busbar can be omitted. A suspension insulator string is installed at the bottom of the high-rise structure beam, and a tension insulator string is installed on the outside of the beam. The high-rise structure is connected via a jumper 23 and a jumper 45. To limit the windage of the jumper 45 conductor below the high-rise structure, a suspension insulator string is installed at the bottom of the high-rise structure beam. A busbar 41 is electrically connected to the high-rise structure jumper 23 through a down conductor 46 connected to the high-rise structure jumper 23. At the right end of the high-rise structure, it is connected to the female-side HGIS outlet bushing 16 of the dual circuit breaker connection section via a jumper 45 and a down conductor 46.

[0064] Through the above arrangement, for a 750kV HGIS substation of the same size with three main transformers and six outgoing lines, this embodiment reduces the number of 750kV HGIS distribution device bays from five to four, reducing the floor area by approximately 5000m 2 At this time, the layout plan of the power distribution device of the substation of this embodiment is as follows Figure 7 shown.

[0065] Example 2

[0066] Based on the first embodiment, this embodiment introduces another specific arrangement structure of the dual circuit breaker connection part.

[0067] In this embodiment, the optional inlet and outlet lines used in the double circuit breaker connection part are the line inlet lines. The layout structure and details of the 3 / 2 circuit breaker connection part in this embodiment are the same as those in embodiment 1 and will not be described in detail. Figure 1 In this case, the dual circuit breaker connection part only has the line outgoing line 44. The substation of this embodiment includes 2 main transformer incoming lines 43 and 5 line outgoing lines 44, a total of 7 incoming and outgoing lines, which are also an odd number.

[0068] In this embodiment, the layout structure of the double circuit breaker connection HGIS is the line outlet 44 scheme, which can be seen in Figure 6 The left part and Figure 9 、 Figure 10 .

[0069] For the outgoing line of the dual-circuit breaker wiring line, a parallel HGIS circuit breaker incoming line scheme is adopted. The HGIS circuit breaker unit 2+0 scheme is also recommended. The first mother-side circuit breaker 21 and the second mother-side circuit breaker 22 are jointly arranged within the range of the #1 main transformer incoming line frame in Example 1. In this case, the lower frame is the transition bus 47 frame. The dual circuit breaker HGIS outgoing line bushing 19 of the dual circuit breaker wiring part is arranged at an outer position close to the outgoing line and directly connected to the first mother-side circuit breaker 21. In this case, the first mother-side HGIS outgoing line bushing 16 is arranged below the transition bus 47 frame. The second mother-side circuit breaker 22 is arranged on the left side of the first mother-side circuit breaker 21, and the second mother-side HGIS outgoing line bushing 17 of the second mother-side circuit breaker 22 is arranged close to the side of the suspended second bus 42. At the outlet side of the second mother side circuit breaker 22, the HGIS branch line 18 is bent horizontally into a C shape and connected to the HGIS outlet bushing 19 of the double circuit breaker 21 of the mother side circuit breaker. Figure 6 The left part is shown in FIG.

[0070] The HGIS outgoing-side bushings in the dual-circuit breaker connection section are connected to the outgoing equipment (PT, lightning arrester) via a busbar 15. The 750kV outgoing line is connected to the 750kV outgoing equipment connection busbar via a jumper 45 connected to the tension insulator string at the end of the high-rise structure and a down conductor 46 connected to the suspension insulator string at the bottom.

[0071] The HGIS outlet bushing 17 on the second bus side of the double circuit breaker connection section supports the tubular busbar 15 through the support insulator 14, and is led to the position below the suspended second busbar 42. The HGIS outlet bushing 17 on the second bus side is connected to the second busbar 42 through the second bus frame suspended tubular busbar and the down conductor 46.

[0072] The high-rise structure 32 is connected via jumpers 23 and jumpers 45. A busbar 41 is electrically connected to the jumpers 23 of the high-rise structure 32 via a down conductor 46. A transition busbar 47 structure in the low-rise structure is located between the two high-rise structures 32 on the right end. To reduce the impact of wind deflection of the high-rise jumpers 23 on the HGIS outlet bushing 16 on the mother side of the dual circuit breaker connection, the high-rise jumpers 23 are first connected to the transition busbar 47 suspended from the low-rise transition busbar 47 structure via a split conductor down conductor 46, and then connected to the mother side HGIS outlet bushing 16 via a split conductor down conductor 46. Under the condition that the stress of the HGIS outlet bushing 16 on the mother side is verified to meet the conditions, the low-level transition busbar 47 frame, the suspended transition busbar 47, and the split conductor down lead 46 can also be eliminated, and the split conductor down lead 46 can be directly connected to the HGIS outlet bushing 16 on the mother side at the appropriate position of the high-level crossover line 23.

[0073] After adopting the double circuit breaker connection arrangement structure of this embodiment, the layout plan of the power distribution device of the HGIS substation is as follows: Figure 9 shown.

Claims

1. A single-bay three-circuit outgoing line arrangement structure for an HGIS power distribution device, characterized by: It includes a 3 / 2 circuit breaker connection section and a dual circuit breaker connection section arranged in the same bay and sharing one busbar and a second busbar; the 3 / 2 circuit breaker connection section includes two incoming and outgoing lines; the dual circuit breaker connection section includes one optional incoming and outgoing line; all HGIS circuit breaker units in the 3 / 2 circuit breaker connection section and the dual circuit breaker connection section are arranged sequentially in the same direction within the space of the bay; The two incoming and outgoing lines of the 3 / 2 circuit breaker connection part include the first main transformer incoming line and the first line outgoing line; in the double circuit breaker connection part, one optional incoming and outgoing line includes the second main transformer incoming line or the second line outgoing line; The first main transformer incoming line, the second main transformer incoming line, the first line outgoing line, and the second line outgoing line are all supported by a layered steel frame, which includes a low-level frame and a high-level frame; the steel beam direction of the low-level frame is parallel to the arrangement direction of the HGIS circuit breaker units, and the low-level frame is used to support the first main transformer incoming line, the second main transformer incoming line, the first busbar, and the second busbar; the steel beam direction of the high-level frame is perpendicular to the arrangement direction of the HGIS circuit breaker units, and the high-level frame is used to support the first line outgoing line, the second line outgoing line, and the crossover line; When one of the selectable incoming and outgoing lines in the dual circuit breaker connection part is the incoming line of the second main transformer, the incoming line of the second main transformer is mounted below the steel beam of the lower frame, and the incoming line direction of the second main transformer is perpendicular to the arrangement direction of the HGIS circuit breaker units; When one of the selectable incoming and outgoing lines in the dual circuit breaker connection part is a second line outgoing line, the second line outgoing line is mounted under the steel beam of the high-rise structure, and the outgoing direction of the second line outgoing line is parallel to the arrangement direction of the HGIS circuit breaker unit.

2. The HGIS power distribution device single bay three-circuit outgoing line arrangement structure according to claim 1, characterized in that: The HGIS circuit breaker unit of the 3 / 2 circuit breaker connection part includes a mother side circuit breaker, a second mother side circuit breaker and a circuit breaker; the first main transformer incoming line is connected to the position between the second mother side circuit breaker and the circuit breaker; the first line outgoing line is connected to the position between the mother side circuit breaker and the circuit breaker.

3. The HGIS power distribution device single bay three-circuit outgoing line arrangement structure according to claim 1, characterized in that: The HGIS circuit breaker unit of the dual circuit breaker connection part includes a first mother-side circuit breaker and a second mother-side circuit breaker; the one selectable incoming and outgoing line is connected between the first mother-side circuit breaker and the second mother-side circuit breaker.

4. The HGIS power distribution device single bay three-circuit outgoing line arrangement structure according to claim 3 is characterized by: An HGIS outlet bushing is also provided on the connection line between the HGIS circuit breaker unit and the incoming and outgoing lines.

5. The single-bay three-circuit outgoing line arrangement structure of the HGIS power distribution device according to claim 4 is characterized in that: An HGIS branch pipeline is further provided on the connection line between the HGIS outlet bushing and the HGIS circuit breaker unit; and a plurality of bending modules are provided on the HGIS branch pipeline.

6. The HGIS power distribution device single bay three-circuit outgoing line arrangement structure according to claim 5, characterized in that: The HGIS outlet bushings include a first-mother side HGIS outlet bushing and a second-mother side HGIS outlet bushing provided at both the 3 / 2 circuit breaker connection part and the double circuit breaker connection part, and also include a double circuit breaker HGIS outlet bushing provided only at the double circuit breaker connection part.

7. The HGIS power distribution device single bay three-circuit outgoing line arrangement structure according to claim 6, characterized in that: When one of the selectable incoming and outgoing lines in the dual circuit breaker connection part is the incoming line of the second main transformer, the dual circuit breaker HGIS outlet bushing is arranged at the common end between the first mother-side circuit breaker and the second mother-side circuit breaker, and the incoming line of the second main transformer is connected to the first mother-side circuit breaker and the second mother-side circuit breaker through the dual circuit breaker HGIS outlet bushing.

8. The HGIS power distribution device single bay three-circuit outgoing line arrangement structure according to claim 6, characterized in that: When one of the selectable incoming and outgoing lines in the dual circuit breaker wiring part is the second line outgoing line, the dual circuit breaker HGIS outgoing bushing is arranged at the end of the first mother-side circuit breaker away from the second mother-side circuit breaker, and the second line outgoing line is connected to the dual circuit breaker HGIS outgoing bushing; the end of the second mother-side circuit breaker away from the first mother-side circuit breaker is connected to the second busbar through the second mother-side HGIS outgoing bushing, and the end of the second mother-side circuit breaker close to the first mother-side circuit breaker is connected to the dual circuit breaker HGIS outgoing bushing through the HGIS branch pipeline; a mother-side HGIS outgoing bushing is arranged between the first mother-side circuit breaker and the second mother-side circuit breaker, and the mother-side HGIS outgoing bushing is connected to the end of the first mother-side circuit breaker close to the second mother-side circuit breaker.

9. The HGIS power distribution device single bay three-circuit outgoing line arrangement structure according to claim 8, characterized in that: In the dual circuit breaker connection part, when one of the optional incoming and outgoing lines is the second line outgoing line, the second main transformer incoming line is not mounted under the corresponding lower-level frame, but a transition bus is mounted instead; the transition bus is connected to a bus through a cross-line, and the transition bus is also connected to an end of a bus-side circuit breaker close to the second bus-side circuit breaker through a bus-side HGIS outgoing bushing.

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