CN115733138A - HGIS power distribution unit single-interval three-loop outlet arrangement structure - Google Patents

Abstract

The invention provides a single-interval three-loop outlet arrangement structure of an HGIS power distribution device, belongs to the technical field of power supply and distribution of a power system, and solves the problem of insufficient space utilization rate of interval outlet arrangement in a traditional 750kV transformer substation; the circuit breaker comprises a 3/2 circuit breaker wiring part and a double circuit breaker wiring part which are arranged in the same interval and share a bus and two buses; the 3/2 circuit breaker wiring part comprises two loops of inlet and outlet wires, and the double circuit breaker wiring part comprises a loop of selectable inlet and outlet wires; all HGIS circuit breaker units in the 3/2 circuit breaker wiring part and the double circuit breaker wiring part are sequentially arranged in the same space along the same direction; on the premise of ensuring the electrical safety and the operation and maintenance convenience of the 750kV power distribution device, the invention does not additionally increase the engineering quantity of related steel structure frameworks, can effectively reduce the floor area of the 750kV transformer substation power distribution device with odd total number of inlet and outlet wires, and improves the economic benefit.

Description

HGIS power distribution unit single-interval three-loop outlet arrangement structure

Technical Field

The invention belongs to the technical field of power supply and distribution of an electric power system, is applied to a power transformation and distribution station in the form of HGIS equipment, and particularly relates to a single-interval three-loop outlet line arrangement structure of an HGIS power distribution device.

Background

In the field of power supply and distribution, 750kV transformer substations in the industry often adopt a metal semi-closed combined electrical apparatus, and other devices except a bus, such as a circuit breaker, an isolating switch, a current transformer and the like are integrated in an SF6 insulated metal shell and are connected with the bus or an outgoing line through a sleeve; the electrical installation formed in this way is referred to as HGIS installation for short.

In a 750kV transformer substation, a 3/2 circuit breaker wiring scheme is usually adopted by a power distribution device, namely 3 circuit breakers are used for 2 outgoing lines, and 1.5 circuit breakers are averagely used for each outgoing line; in the 3/2 circuit breaker wiring scheme, the circuit breaker connected to the bus side is called an edge circuit breaker, and the circuit breaker located in the middle is called a middle circuit breaker.

In the prior art, the number of the HGIS device circuit breakers in the string according to the wiring scheme of the 3/2 circuit breaker is different in joint arrangement, and the method can be divided into the following steps: 3+0 scheme, 2+1 scheme, and 1+1 scheme; wherein, the 3+0 scheme is as follows: the 3 circuit breakers are jointly arranged, the middle circuit breaker and the 2 side circuit breakers share a wire outlet sleeve, and each string of equipment comprises 4 groups of wire outlet sleeves; the 2+1 scheme is: 2 circuit breakers are jointly arranged, the middle circuit breaker and the 1 circuit breaker share a wire outlet sleeve, and each string of equipment comprises 5 groups of wire outlet sleeves; 1 and the solution of 1 and 1 is: each circuit breaker is arranged independently, the middle circuit breaker and the side circuit breaker do not share the outgoing line sleeve, and each string of equipment comprises 6 groups of outgoing line sleeves.

For a distribution device of a 750kV transformer substation, under the condition that the total number of incoming and outgoing lines is odd in a 3/2 circuit breaker wiring scheme, in view of the fact that the reliability requirement of a current operation unit on the main transformer wiring is high, after the 3/2 circuit breaker wiring scheme is in series connection, the remaining 1-circuit outgoing line or main transformer incoming line adopts a mode that double circuit breakers are respectively connected into two sections of buses, and the mode is equivalent to that 2 circuit breakers are used for the incoming and outgoing lines.

For a 750kV transformer substation with 3 main transformers, if the scale of an outgoing line of a 750kV line is an even number of loops, in order to ensure the reliability of the main transformers, the main transformers are connected in series or connected through double circuit breakers; after the main transformer of each loop is matched with the 750kV outgoing line in series, the number of the remaining 750kV outgoing lines is an odd number. When a 3/2 circuit breaker wiring scheme is adopted, each complete string can only be connected with 2-turn 750kV outgoing lines, 1-turn 750kV outgoing lines are bound to fall, and the complete string cannot be formed. In the prior art, aiming at the situation, the conventional method is that the improved lines are respectively connected to two sections of buses through double breakers; therefore, this approach will also occupy one complete 750kV outgoing line interval.

Meanwhile, the arrangement structure of the conventional HGIS equipment adopts a double-layer framework scheme, the incoming line and the bus framework of the 750kV main transformer adopt a low-layer framework, and the cross-line of the 750kV outgoing line and the incoming string adopt a high-layer framework; the main transformer can be led into a corresponding string through a low-level framework on the outer side of the power distribution device, and then is led up to a high-level framework overline through a jumper to be led into the position of an HGIS equipment sleeve in the string.

In summary, in the existing HGIS equipment technology of 750kV transformer substations, a plurality of intervals are designed on an HGIS arrangement structure, and only 3 groups of circuit breaker equipment in one string in 3/2 wiring or 2 groups of circuit breaker equipment in double circuit breaker wiring are arranged in each interval; for the transformer substation with odd scale of inlet and outlet lines, the space below the inlet line of the low-level framework of the main transformer is not fully utilized; for the last outlet interval at the tail end, the space utilization is also insufficient when time synchronization is carried out by adopting double-breaker wiring; in different cases, gaps with insufficient space utilization occur, but cannot be omitted according to the prior art; therefore, the conventional HGIS equipment arrangement structure has the problem of insufficient field utilization rate of the power distribution device when the total number of incoming and outgoing lines is odd; this problem influences the design and construction, the operation and maintenance development of transformer substation, has influenced economic benefits, and then be unfavorable for the development of whole power supply and distribution technique big from the macroscopic aspect, because transformer substation's area is great itself, and economic cost is high, consequently, how to improve in order to obtain more excellent transformer substation structure space utilization, is the problem that awaits a urgent solution in the power system development.

Disclosure of Invention

In order to solve the problem of space utilization rate in the background art, the invention provides a single-interval three-loop outlet arrangement structure applied to an HGIS equipment power distribution device in a 750kV transformer substation, and the engineering quantity of related steel structure frameworks is not additionally increased on the premise of ensuring the electrical safety and operation and maintenance convenience of the 750kV power distribution device; the purpose of three outgoing lines at a single interval is realized by simultaneously arranging a complete string of 3/2 wiring and a complete unit of double-breaker wiring in the single 750kV HGIS equipment power distribution device interval, so that the occupied area of the 750kV transformer substation power distribution device with odd total incoming and outgoing lines can be effectively reduced, the engineering construction investment cost is reduced, and the economic benefit is improved.

The invention adopts the following technical scheme to realize the purpose:

a single-interval three-return-outlet line arrangement structure of an HGIS power distribution device comprises a 3/2 circuit breaker wiring part and a double circuit breaker wiring part which are arranged in the same interval and share a bus and two buses; the 3/2 circuit breaker wiring part comprises two return inlet and outlet wires; the double-breaker wiring part comprises a selectable inlet and outlet wire; and all HGIS circuit breaker units in the 3/2 circuit breaker wiring part and the double circuit breaker wiring part are sequentially arranged in the spaced space along the same direction.

The application object of the scheme is a typical HGIS transformer substation with odd total number of 750kV incoming and outgoing lines, the HGIS transformer substation is provided with a plurality of series outgoing line intervals, except that part of the intervals adopt the single-interval three-loop outgoing line arrangement of the scheme, the other intervals can normally adopt the traditional 3/2 circuit breaker wiring scheme, for example, the first series outgoing line interval is occupied by the incoming line of a main transformer and the outgoing line towards the east, and the two-loop incoming and outgoing line interval is occupied, and the second series outgoing line interval adopts the single-interval three-loop outgoing line arrangement.

Furthermore, the two return inlet and outlet wires of the wiring part of the 3/2 circuit breaker comprise a first main transformer inlet wire and a first line outlet wire; the HGIS circuit breaker unit of the 3/2 circuit breaker wiring part comprises a female side circuit breaker, two female side circuit breakers and a middle circuit breaker; the first main transformer incoming line is connected between the two bus side circuit breakers and the middle breaker; the first line outgoing line is connected between a female side circuit breaker and an interrupt circuit breaker, and is simultaneously connected with various outgoing line devices such as a PT (potential transformer), a lightning arrester, a high-impedance transformer and the like to carry out outgoing.

Furthermore, the optional incoming and outgoing line comprises a second main transformer incoming line or a second line outgoing line; the HGIS circuit breaker unit of the double-circuit breaker wiring part comprises a female side circuit breaker and two female side circuit breakers; and the optional inlet and outlet line is connected between the female side circuit breaker and the two female side circuit breakers.

Specifically, an HGIS outgoing line sleeve is further arranged on a connection line between the HGIS breaker unit and the incoming and outgoing lines.

Specifically, an HGIS branch line is further arranged on a connection line between the HGIS outgoing line sleeve and the HGIS circuit breaker unit; a plurality of bending modules are arranged on the HGIS branch pipeline; in the wiring part of the 3/2 circuit breaker, the HGIS circuit breaker unit adopts line side outgoing, the arrangement scheme is similar to a half C shape, the primary side circuit breaker and the middle circuit breaker are connected with outgoing positions, the outgoing positions are led to the outgoing positions outside the bus through branch lines of the HGIS, and the outgoing is performed through an HGIS outgoing sleeve; the HGIS outlet sleeve is aligned with the HGIS circuit breaker unit, and the HGIS branch pipeline is bent horizontally and vertically to realize half-C-shaped bending and bending of a road in a station.

In the wiring part of the 3/2 circuit breaker, the HGIS circuit breaker unit can adopt a 3+0, 2+1, 1+1 scheme, preferably a 2+1 scheme, because the scheme can save 1 group of 750kV HGIS outgoing line bushings compared with the 1+1 scheme, and has better overhauling flexibility compared with the 3+0 scheme.

Specifically, the HGIS outgoing line sleeve comprises a bus-side HGIS outgoing line sleeve and a bus-side HGIS outgoing line sleeve both arranged at the 3/2 circuit breaker wiring part and the double circuit breaker wiring part, and further comprises a double circuit breaker HGIS outgoing line sleeve only arranged at the double circuit breaker wiring part.

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 borne by a layered steel framework, and the layered steel framework comprises a low-rise framework and a high-rise framework; the steel beam direction of the low-level framework is parallel to the arrangement direction of the HGIS circuit breaker units, and the low-level framework is used for bearing a first main transformer incoming line, a second main transformer incoming line, a bus and two buses; the steel beam direction of the high-rise framework is perpendicular to the arrangement direction of the HGIS circuit breaker units, and the high-rise framework is used for bearing a first line outgoing line, a second line outgoing line and a crossover line.

Specifically, one optional incoming and outgoing line in the wiring part of the double circuit breaker is a second main transformer incoming line, the second main transformer incoming line is mounted below a steel beam of the low-level framework, and the incoming direction of the second main transformer incoming line is perpendicular to the arrangement direction of the HGIS circuit breaker units; the double-circuit breaker HGIS outlet sleeve is arranged at a public end between the first female side circuit breaker and the second female side circuit breaker, and the second main transformer inlet wire is connected with the first female side circuit breaker and the second female side circuit breaker through the double-circuit breaker HGIS outlet sleeve.

Specifically, one optional incoming and outgoing line in the double-circuit breaker wiring part is a second line outgoing line, the second line outgoing line is mounted below the steel beam of the high-rise framework, and the outgoing direction of the second line outgoing line is parallel to the arrangement direction of the HGIS circuit breaker units; the double-circuit breaker HGIS outlet sleeve is arranged at one end of the one-bus side circuit breaker, which is far away from the two-bus side circuit breakers, and the second line outlet is connected with the double-circuit breaker HGIS outlet sleeve; one ends of the two bus-side circuit breakers, which are far away from one bus-side circuit breaker, are connected with the two buses through two bus-side HGIS (hybrid gas insulated switchgear) outgoing line sleeves, and one ends of the two bus-side circuit breakers, which are close to the one bus-side circuit breaker, are connected to the double-circuit breaker HGIS outgoing line sleeves through HGIS branch lines; a female side HGIS outlet sleeve is arranged between the female side circuit breaker and the two female side circuit breakers, and the female side HGIS outlet sleeve is connected with one end, close to the two female side circuit breakers, of the female side circuit breaker.

Specifically, when an optional incoming and outgoing line of the double-circuit-breaker wiring part is a second line outgoing line, a second main transformer incoming line is not mounted below the corresponding low-layer framework, and is changed into a mounting transition bus; the transition bus is connected with a bus through a crossover line, and the transition bus is also connected with one end, close to the two bus-side circuit breakers, of one bus-side circuit breaker through a bus-side HGIS (hybrid gas insulated switchgear) outgoing line sleeve.

In summary, in the single-interval three-circuit-outlet arrangement structure, the outlet of the double-circuit-breaker wiring part can adapt to two different modes of the main transformer inlet wire and the line outlet wire according to actual requirements, so that the double-circuit-breaker wiring part bears the effect of one-circuit inlet and outlet wires, and the space utilization is optimal.

In the double-circuit-breaker wiring part, the HGIS circuit breaker unit can adopt 2+0 and 1+1 schemes, preferably 2+0 schemes, and 1 group of 750kV HGIS outgoing line bushings can be saved.

In summary, due to the adoption of the technical scheme, the invention has the following beneficial effects:

after the single-interval three-loop outlet wire arrangement structure is adopted, the vacant position below the low-layer framework of the inlet wire of the main transformer of the 750kV HGIS power distribution device is reasonably utilized, the original double-circuit breaker wiring independently occupies a complete 750kV HGIS power distribution device interval, and is combined into the same interval in a 3/2 wiring string of the inlet wire of the main transformer on the premise of meeting electrical safety and space planning; the arrangement structure enables the incoming lines of the main transformer to be simultaneously and alternately arranged with complete 3/2 wiring strings and double circuit breaker wiring units, and directly saves the occupied space of a complete interval on the premise of not increasing additional investment or reconstruction cost. Therefore, the method can be widely used for HGIS substations with odd total number of incoming and outgoing lines of the 750kV power distribution device, thereby bringing remarkable economic benefit improvement, and in the expansion and development process of the substations, the area required by new intervals does not need to be analyzed again and expanded on the occupied land.

Drawings

FIG. 1 is a schematic connection diagram of a single-interval three-loop line arrangement structure according to the present invention;

FIG. 2 is a schematic connection diagram of a conventional substation layout structure;

fig. 3 is a plan view of a conventional substation layout structure;

FIG. 4 isbase:Sub>A cross-sectional view of the arrangement at location A-A in FIG. 3;

FIG. 5 is a plan view of a 3/2 circuit breaker wiring portion arrangement of the present invention;

fig. 6 is a plan view of a double circuit breaker wiring part arrangement of the present invention;

fig. 7 is a plan view of the arrangement of the present invention when a main transformer inlet scheme is employed;

FIG. 8 is a cross-sectional view of the arrangement at position B-B in FIG. 7;

fig. 9 is a plan view of an arrangement of the present invention when employing a line outlet scheme;

fig. 10 is a cross-sectional view of the arrangement at the position C-C in fig. 9.

The designations in the drawings specifically have the following meanings:

11-one bus side circuit breaker, 12-middle circuit breaker, 13-two bus side circuit breakers, 14-post insulator, 15-tube bus, 16-one bus side HGIS outlet sleeve, 17-two bus side HGIS outlet sleeve, 18-HGIS branch line, 19-double circuit breaker HGIS outlet sleeve, 21-one bus side circuit breaker, 22-two bus side circuit breakers, 23-crossover line, 31-low-level framework, 32-high-level framework, 41-one bus, 42-two bus, 43-main transformer inlet line, 44-line outlet line, 45-jumper line, 46-down lead, 47-transition bus and 51-transportation road junction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

In order to more clearly illustrate the difference between the arrangement of the present embodiment and the conventional arrangement, the conventional HGIS substation arrangement will be described in detail first.

As shown in fig. 2, in a conventional 750kV substation, 3 main transformers are installed in the substation, which can be numbered as #1, #2, and #3 main transformers; the total number of outgoing lines 44 of the 750kV line is 6, wherein the outgoing lines return to the east and the outgoing lines return to the west, and therefore the total number of the incoming and outgoing lines of the transformer substation is 9 and odd; 3, high-voltage shunt reactors are arranged on the outgoing lines; in the wiring scheme of the 3/2 circuit breaker adopted by the 750kV power distribution device in fig. 2, three main transformers are respectively connected into a first interval, a second interval and a third interval of the 750kV power distribution device and are correspondingly provided with 1-loop line outgoing lines 44 in series.

After the 3 main transformers are connected in series with the 3-circuit outgoing lines 44, in the remaining 3-circuit outgoing lines 44, the 2-circuit outgoing lines 44 are arranged in a fourth interval in series; and the 1-circuit outgoing lines 44 of the rest drop sheets are distributed in the fifth interval in a double-breaker wiring mode.

The detailed structural plane of the above conventional arrangement can be seen in the schematic of fig. 3; in the section of fig. 4, it can be seen that the main transformers are fed into the respective strings through the lower level structure 31 outside the power distribution unit and then up the flying lead 23 of the upper level structure 32 through the jumper 45 to the casing location of the HGIS equipment within the string.

Thus, only 3/2 wired 3-bank circuit breaker devices in one string or dual circuit breaker wired 2-bank circuit breaker devices are arranged in each bay of a conventional HGIS arrangement. For the transformer substation with odd scale of the incoming and outgoing lines, the space below the incoming line of the low-level framework of a main transformer incoming line (such as # 3) is not fully utilized; for the last outlet interval at the tail end, double circuit breakers are adopted for wiring, and the space utilization is also insufficient. The conventional HGIS arrangement structure has insufficient utilization rate of a power distribution device field for the condition that the total number of incoming and outgoing lines is odd.

Example 1

This embodiment specifically describes the single-interval three-circuit incoming and outgoing line arrangement structure of the present invention.

As shown in FIG. 1, a single-interval three-loop line arrangement structure of an HGIS power distribution device comprises a 3/2 circuit breaker wiring part and a double circuit breaker wiring part which are arranged in the same interval and share a bus 41 and two buses 42; the 3/2 circuit breaker wiring part comprises two return inlet and outlet wires; the double-circuit breaker wiring part comprises a selectable inlet and outlet wire; all HGIS circuit breaker units in the 3/2 circuit breaker wiring part and the double circuit breaker wiring part are sequentially arranged in the spaced space along the same direction.

Referring to the example of fig. 1, the second bay in fig. 1 includes 5 HGIS breaker units, which are actually arranged in the same horizontal row, and the positions in fig. 1 are drawn for convenience of illustrating the connection relationship. Reference can be made to the arrangement of the HGIS breaker unit through the section of fig. 8 or 10. In fig. 1, in the connection portion of the double circuit breaker, the #1 main incoming line and the #1 outgoing line 4 do not exist at the same time, but exist in an alternative manner, and the example in the figure shows that the connection points of the two incoming and outgoing lines are located at the same position in the connection portion of the double circuit breaker, and this embodiment describes the case when the #1 main incoming line exists, the transformer station at this time includes 3 main incoming lines and 6 return outgoing lines 44, and there are 9 return incoming and outgoing lines.

As shown in fig. 8, in the present embodiment, an optional incoming/outgoing line used in the wiring portion of the dual circuit breaker is a main transformer incoming line 43; in fig. 8, the HGIS power distribution device area is provided with layered steel frameworks, which include a lower-level framework 31 and an upper-level framework 32, and a single-interval three-loop line structure is provided with 4 lower-level frameworks 31 and 4 upper-level frameworks 32; the low-level framework 31 is parallel to the section direction of FIG. 8, and sequentially comprises from left to right along the section B-B: a primary framework, a #2 main transformer incoming line framework, a secondary framework and a #1 main transformer incoming line framework.

The high-rise framework 32 is vertical to the section direction of the drawing 8, hanging points of the high-rise framework 32 on the left and right outermost sides can be used for hanging the 750kV line outgoing line 44, and hanging points of the rest high-rise frameworks are used for hanging the overline 23.

An insulator string hanging point is arranged at the beam bottom of the low-layer framework 31 and is used for a main transformer incoming line vertical to the section direction of the figure 8; a V-shaped insulator string or an I-shaped insulator string can be adopted to be matched with a soft bus of the suspension split conductor.

The specific arrangement structure of the 3/2 breaker wiring portion in the present embodiment is described below.

3/2 circuit breaker wiring part, HGIS circuit breaker unit recommends 2+1 arrangement scheme, in this interval a female side circuit breaker 11 and middle circuit breaker 12 are arranged between a female framework and main transformer incoming framework, and two female side circuit breakers 13 are arranged in the range of two female frameworks. And 2 secondary bus side HGIS outlet sleeves 17 in the 3/2 wiring are connected by adopting a support insulator 14 to support a pipe bus 15.

The 3+0 arrangement scheme can also be adopted, three circuit breakers are jointly arranged, the position of a bus-side HGIS outlet sleeve 16 is not moved, at the moment, two bus-side HGIS outlet sleeves 17 are combined into one, the position of one bus-side HGIS outlet sleeve 17 is shifted to the left by about the length of one circuit breaker unit, a support tube bus 15 is supported by a support insulator 14, and the position of the bus-side HGIS outlet sleeve 17 is led to the lower part of two bus frameworks suspending two buses 42.

No matter whether the HGIS breaker unit adopts the 2+1 or 3+0 arrangement scheme, a bus side outlet position between a bus side breaker 11 and a middle breaker 12 needs to be led to a bus side HGIS outlet bushing 16 position through the HGIS branch line 18. The HGIS branch lines 18 are shown in plan view in a semi-C-bend arrangement leading from a bus side outlet position to a bus side HGIS outlet sleeve 16 position, as can be seen schematically in fig. 5. According to the arrangement requirement, the HGIS branch pipeline 18 needs to adopt a horizontal and vertical bending module to cross the transport road intersection 51 in the station. The specific connection of the branch lines 18 of the HGIS in this interval is indicated in plan view by reference to the schematic of FIG. 5

A bus-side HGIS outgoing line sleeve 16 is connected with outgoing line equipment (PT, lightning arrester, high-voltage reactance and the like) through a pipe bus 15 or a split conductor. The 750kV outgoing line is connected to a connecting pipe bus of 750kV outgoing equipment through a jumper wire 45 connected with a tension insulator string at the end part of the high-rise framework, a down lead 46 connected with a bottom suspension insulator string.

A bus side HGIS outlet sleeve 16 is connected to a bus bar 41 by a bus frame hanger tube bus, down conductor 46. The #2 main transformer incoming line adopts a #2 main transformer incoming line framework suspension pipe bus transverse incoming line mode, and is led down to a conductor section (which can be a sleeve terminal or any position on a pipe bus 15) connected with the two bus side HGIS outgoing line sleeves 17 through a split conductor. The two-bus-side HGIS outlet bushing 17 is connected to the two bus bars 42 through the two-bus frame hanger tube bus, down conductor 46.

The specific arrangement structure of the double breaker wiring portion in the present embodiment is described below.

In this embodiment, the arrangement structure of the double circuit breaker connection HGIS is a main incoming line scheme, which can be seen from the right part in fig. 6 and fig. 7 and 8.

For the incoming line of a double-circuit breaker wiring main transformer, the scheme of the incoming line of the HGIS circuit breaker is vertical. The HGIS breaker unit 2+0 solution is recommended. The primary side circuit breaker 21 and the secondary side circuit breaker 22 of the HGIS circuit breaker unit are jointly arranged within the framework of the #1 main transformer incoming line. The double-circuit breaker HGIS outlet bushing 19 is approximately positioned right below the #1 main transformer inlet framework, and the #1 main transformer is connected to the double-circuit breaker HGIS outlet bushing 19 through a split conductor down lead 46 through a V-shaped insulator string and a suspension tube bus inlet at the beam bottom of the #1 main transformer inlet framework. The double circuit breaker HGIS outlet bushing 19 is arranged in the middle of the 3-bushing, a bus-side circuit breaker 21 is arranged on the right side of the bushing and two bus-side circuit breakers 22 are arranged on the left side of the bushing.

In the double-breaker wiring part, two bus-side HGIS outgoing line sleeves 17 support the pipe bus 15 through the post insulator 14, and the positions of the two bus-side HGIS outgoing line sleeves 17 are led to the lower part of the two suspension buses 42. The two bus side HGIS outlet bushings 17 are connected to the two buses 42 through the two bus frame hanger tube buses, down conductor 46.

In the double-breaker wiring part, a bus-side HGIS outlet sleeve 16 supports the pipe bus 15 to be led out through a support insulator 14. The HGIS position of the double circuit breaker wiring can also be adjusted to the right as appropriate so that the post insulator and the pipe nut can also be omitted. And a suspension insulator string is arranged at the bottom of the beam of the high-rise framework, and a strain insulator string is arranged outside the beam. The high-rise fabric is connected by a jumper 23 and a jumper 45. In order to limit the windage yaw of the wires of the jumper 45 below the high-rise framework, a suspension insulator string is arranged at the bottom of the beam of the high-rise framework. A bus bar 41 is electrically connected to the overhead crossover 23 of the high-rise frame through a down conductor 46 connected to the overhead crossover 23 of the high-rise frame at the right end and connected to a bus-side HGIS outlet bushing 16 of the double circuit breaker connection portion through a jumper 45 and the down conductor 46.

Through the arrangement mode, for 750kV HGIS substations with 3 main transformers and 6 return lines on the same scale, the number of the 750kV HGIS power distribution devices is reduced from 5 to 4, and the floor area is reduced by about 5000m ² . The distribution device arrangement plane of the substation of the present embodiment at this time is as shown in fig. 7.

Example 2

On the basis of embodiment 1, this embodiment introduces another specific arrangement structure of the wiring portion of the double circuit breaker.

In this embodiment, a selectable incoming and outgoing line used by the double-circuit breaker wiring portion is a line incoming line, and the arrangement structure and the detailed contents of the 3/2 circuit breaker wiring portion in this embodiment are the same as those in embodiment 1, and are not described in detail. In fig. 1, the double-circuit breaker connection part only has a line outgoing line 44, and the substation of the present embodiment includes 2 main transformer incoming lines 43 and 5 line outgoing lines 44, and 7 incoming and outgoing lines, which are also odd-numbered.

In this embodiment, the arrangement structure of the double circuit breaker connection HGIS is a line outgoing line 44 scheme, which can be seen from the left part in fig. 6 and fig. 9 and 10.

For the outgoing line of the wiring line of the double circuit breakers, the line incoming scheme of the HGIS circuit breaker is parallel. The HGIS breaker unit 2+0 solution is also recommended. The one-bus side circuit breaker 21 and the two-bus side circuit breaker 22 are jointly arranged in the range of the original #1 main transformer incoming line framework in the embodiment 1, and the lower-layer framework is a transition bus 47 framework. The double-breaker HGIS outgoing line sleeve 19 of the double-breaker wiring part is arranged at the outer side position close to the outgoing line and is directly connected with a bus-side breaker 21, and at the moment, a bus-side HGIS outgoing line sleeve 16 is arranged below the framework of the transition bus 47. The two bus side breakers 22 are disposed on the left side of the one bus side breaker 21, and the two bus side HGIS outgoing bushings 17 of the two bus side breakers 22 are disposed on the side close to the two suspension buses 42. At the outlet-side position of the two-parent-side circuit breaker 22, the branch HGIS line outgoing bushing 19 of the double-circuit breaker HGIS led to the one-parent-side circuit breaker 21 by horizontally bending the branch HGIS line 18 like a C-shape, as can be seen in the left-hand part of fig. 6.

And the HGIS outgoing line side sleeve of the double-circuit breaker wiring part is connected with outgoing line equipment (PT and a lightning arrester) through a pipe bus 15. The 750kV outgoing line is connected to a connecting pipe bus of 750kV outgoing equipment through a jumper wire 45 connected with a tension insulator string at the end part of the high-rise framework and a down lead 46 connected with a bottom suspension insulator string.

The two bus side HGIS outlet sleeves 17 of the wiring parts of the double circuit breakers support the pipe buses 15 through the post insulators 14, and the positions of the two bus side HGIS outlet sleeves 17 are led to the lower parts of the two suspension bus bars 42. The two-bus-side HGIS outlet bushings 17 are connected to the two buses 42 through two-bus frame hanger pipe buses, down conductors 46.

The high-rise framework 32 is in communication with the jumper line 45 through the jumper line 23, and a bus bar 41 is in electrical communication with the jumper line 23 of the high-rise framework 32 through a down conductor 46 connected to the jumper line 23 of the high-rise framework 32. Between the two high-rise frames 32 at the right end portion, a transition bus bar 47 frame in the low-rise frame is provided. In order to reduce the stress influence of windage yaw of the high-rise overline 23 on the HGIS outgoing line sleeve 16 at the bus side of the double circuit breaker connection, the high-rise overline 23 is firstly led to the transition bus 47 suspended by the framework of the low-rise transition bus 47 through the split conductor down lead 46 and then led to the HGIS outgoing line sleeve 16 at the bus side through the split conductor down lead 46. Under the condition that the stress of a bus-side HGIS outgoing line sleeve 16 is verified to meet the condition, the framework of the lower-layer transition bus 47, the suspension transition bus 47 and the split conductor down lead 46 can be eliminated, and the split conductor down lead 46 is directly led to the bus-side HGIS outgoing line sleeve 16 at the proper position of the upper-layer overline 23.

After the arrangement structure of the double-circuit breaker wiring part of the embodiment is adopted, the arrangement plane of the power distribution device of the HGIS substation is shown in fig. 9.

Claims (10)

1. A HGIS distribution device single interval three-loop line arrangement structure is characterized in that: the circuit breaker comprises a 3/2 circuit breaker wiring part and a double circuit breaker wiring part which are arranged in the same interval and share a bus and two buses; the 3/2 circuit breaker wiring part comprises two return inlet and outlet wires; the double-breaker wiring part comprises a selectable inlet and outlet wire; and all HGIS circuit breaker units in the 3/2 circuit breaker wiring part and the double circuit breaker wiring part are sequentially arranged in the spaced space along the same direction.

2. An HGIS power distribution apparatus single-interval three-return line arrangement as claimed in claim 1, wherein: the two-circuit incoming and outgoing line of the wiring part of the 3/2 circuit breaker comprises a first main transformer incoming line and a first line outgoing line; the HGIS circuit breaker unit of the 3/2 circuit breaker wiring part comprises a female side circuit breaker, two female side circuit breakers and a middle circuit breaker; the first main transformer incoming line is connected between the two female side circuit breakers and the interrupt circuit breaker; the first line outgoing line is connected between a mother side breaker and the breaker.

3. An HGIS power distribution apparatus single-interval three-return line arrangement as claimed in claim 2, wherein: in the wiring part of the double circuit breaker, one optional incoming and outgoing line comprises a second main transformer incoming line or a second line outgoing line; the HGIS circuit breaker unit of the double-circuit breaker wiring part comprises a female side circuit breaker and two female side circuit breakers; and the optional inlet and outlet wire is connected between the primary side circuit breaker and the secondary side circuit breaker.

4. An HGIS power distribution apparatus single-interval three-return line arrangement as claimed in claim 3, wherein: and an HGIS outlet sleeve is also arranged on a connecting circuit of the HGIS circuit breaker unit and the inlet and outlet wires.

5. An HGIS power distribution apparatus single-interval three-return line arrangement as claimed in claim 4, wherein: an HGIS branch pipeline is also arranged on a connecting circuit between the HGIS outlet casing and the HGIS circuit breaker unit; and a plurality of bending modules are arranged on the HGIS branch pipeline.

6. An HGIS power distribution apparatus single-interval three-return line arrangement as claimed in claim 5, wherein: the HGIS outgoing line sleeve comprises a bus-side HGIS outgoing line sleeve and a bus-side HGIS outgoing line sleeve which are arranged at the 3/2 circuit breaker wiring part and the double circuit breaker wiring part, and also comprises a double circuit breaker HGIS outgoing line sleeve which is only arranged at the double circuit breaker wiring part.

7. An HGIS power distribution apparatus single-interval three-return line arrangement as claimed in claim 6, wherein: 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 borne by a layered steel framework, and the layered steel framework comprises a low-rise framework and a high-rise framework; the steel beam direction of the low-level framework is parallel to the arrangement direction of the HGIS circuit breaker units, and the low-level framework is used for bearing a first main transformer incoming line, a second main transformer incoming line, a bus and two buses; the steel beam direction of the high-rise framework is perpendicular to the arrangement direction of the HGIS circuit breaker units, and the high-rise framework is used for bearing a first line outgoing line, a second line outgoing line and a crossover line.

8. An HGIS power distribution apparatus single-interval three-return line arrangement as claimed in claim 7, wherein: an optional incoming and outgoing line in the wiring part of the double circuit breaker is a second main transformer incoming line, the second main transformer incoming line is mounted below a steel beam of the low-level framework, and the incoming direction of the second main transformer incoming line is perpendicular to the arrangement direction of the HGIS circuit breaker units; the double-circuit breaker HGIS outlet sleeve is arranged at a public end between the first female side circuit breaker and the second female side circuit breaker, and the second main transformer inlet wire is connected with the first female side circuit breaker and the second female side circuit breaker through the double-circuit breaker HGIS outlet sleeve.

9. An HGIS power distribution apparatus single-interval three-return line arrangement as claimed in claim 7, wherein: one optional incoming and outgoing line in the double-circuit breaker wiring part is a second line outgoing line, the second line outgoing line is mounted below a steel beam of the high-rise framework, and the outgoing direction of the second line outgoing line is parallel to the arrangement direction of the HGIS circuit breaker units; the double-circuit breaker HGIS outlet sleeve is arranged at one end of the one-bus side circuit breaker, which is far away from the two-bus side circuit breakers, and the second line outlet is connected with the double-circuit breaker HGIS outlet sleeve; one ends of the two bus-side circuit breakers, which are far away from one bus-side circuit breaker, are connected with the two buses through two bus-side HGIS (hybrid gas insulated switchgear) outgoing line sleeves, and one ends of the two bus-side circuit breakers, which are close to the one bus-side circuit breaker, are connected to the double-circuit breaker HGIS outgoing line sleeves through HGIS branch lines; a female side HGIS outlet sleeve is arranged between the female side circuit breaker and the two female side circuit breakers, and the female side HGIS outlet sleeve is connected with one end, close to the two female side circuit breakers, of the female side circuit breaker.

10. An HGIS power distribution apparatus single-interval three-return line arrangement as claimed in claim 9, wherein: when one optional incoming and outgoing line of the double-circuit breaker wiring part is a second line outgoing line, a second main transformer incoming line is not mounted below the corresponding low-layer framework, and the second main transformer incoming line is changed into a mounting transition bus; the transition bus is connected with a bus through a crossover line, and the transition bus is also connected with one end, close to the two bus-side circuit breakers, of one bus-side circuit breaker through a bus-side HGIS (hybrid gas insulated switchgear) outgoing line sleeve.

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