CN211182805U

CN211182805U - Wiring structure of low-voltage side of transformer substation

Info

Publication number: CN211182805U
Application number: CN201821545042.3U
Authority: CN
Inventors: 周军; 曹智; 刘忠文; 倪虹妹; 蓝翔; 杨锐棋
Original assignee: Shenzhen Power Supply Planning Design Institute Co ltd
Current assignee: Shenzhen Power Supply Planning Design Institute Co ltd
Priority date: 2018-09-20
Filing date: 2018-09-20
Publication date: 2020-08-04
Anticipated expiration: 2028-09-20

Abstract

The utility model discloses a wiring structure of a low-voltage side of a transformer substation, wherein each main transformer is connected with a first bus, the first bus is respectively connected with main network unit equipment and a second bus, the second bus is connected with distribution network unit equipment, the first bus is connected end to form an annular wiring or the second bus is connected end to form an annular wiring, and the technical problem that the equipment of different operation and maintenance units in the prior art are mixed together and physical isolation cannot be realized is solved; the electric connection among the devices of different operation and maintenance units is reduced, the management interfaces of different operation and maintenance units are distinguished, and the cross operation is avoided, so that the work management efficiency is improved.

Description

Wiring structure of low-voltage side of transformer substation

Technical Field

The utility model belongs to the technical field of the transformer substation and specifically relates to a wiring structure of transformer substation low pressure side.

Background

Mixing all system substations: a transformer substation which is managed and operated and maintained by different units, such as a 20kV outgoing line cabinet is operated and maintained by a distribution network unit, and a 20kV capacitor cabinet, a main transformer incoming line cabinet and other voltage class equipment of the transformer substation are operated and maintained by a main network unit.

At present, in the design of domestic transformer substations, 220KV direct-falling 20KV transformer substations belong to the leading-edge technology, the number of operating transformer substations is small, and fewer operating transformer substations meeting different parent 'two-wire loop closing + connection' are required for guaranteeing high power supply reliability. In commissioned substations, 20kv is typically wired in single bus sections or in single bus ring sections.

The single-bus section wiring is an electric main wiring adopting a circuit breaker to section the single bus. When one section of bus breaks down, the sectional breaker automatically cuts off the fault section, so that uninterrupted power supply of the normal section of bus is ensured and power failure of important users is avoided. It has 4 main transformer 20 kilovolt buses (four section buses are 1M respectively, 2M, 3M and 4M) to establish a certain station, 20 kilovolt adopts single bus segmentation wiring, set up the segmentation circuit breaker between the bus (promptly at 1M, 2M section bus sets up the segmentation circuit breaker, set up the segmentation circuit breaker between 2M, 3M section bus, set up the segmentation circuit breaker between 3M, 4M section bus, when #1 main transformer overhauls, 1M section bus provides the power by 2M section bus, if 2M section bus trouble this moment, 2M section bus is amputated by the circuit breaker automatically, 1M section bus is amputated simultaneously.

Based on this, in order to improve the power supply reliability, a single-bus segmented annular wiring form is adopted, referring to fig. 1, fig. 1 is a main wiring diagram of a conventional 220kV transformer station, the transformer station is provided with 4 220kV direct-reduction 20kV main transformers (#1, #2, #3 and #4), a double-bus double-segmented wiring is adopted at the 220kV side, each main transformer is connected with 1 segment of 20kV bus, and then four segments of buses are provided, namely 1M, 2M, 3M and 4M; the 20kV side adopts single-bus four-section annular connection (1M, 2M, 3M and 4M form annular connection, namely a section breaker is arranged between 1M and 2M section buses, a section breaker is arranged between 2M and 3M section buses, a section breaker is arranged between 3M and 4M section buses, a section breaker is arranged between 1M and 4M section buses), an outgoing line cabinet, a station transformer cabinet, a capacitor cabinet, a bus equipment cabinet, a main transformer incoming line cabinet and the like are connected in a 20kV bus in a mixed mode, the connection form is flexible and reliable, and if a #1 main transformer fails, the 1M section bus at the 20kV side can be powered by the 2M section bus or the 4M section bus; when the 2M section of bus has a fault, the 4M section of bus can provide power for the 1M section of bus, and the power failure range can not be expanded. Because all the incoming and outgoing lines of the single-bus ring connection are connected together, the connection form is difficult to realize for the requirement of mixing all the system substations.

Under the operation and maintenance mode of all the hybrid system and substation, each operation and maintenance unit requires that the managed equipment is independently arranged and physically isolated. And the two wiring modes 20 kilovolt outgoing line cabinet and the station transformer cabinet, the capacitor cabinet, the bus equipment cabinet, the main transformer incoming line cabinet and the like are located on the same section of bus, and the total station has 4 sections of buses, so that independent physical isolation is realized, the building area is excessively occupied, the transformer substation land is increased, and the land resource waste is caused.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model discloses an object is to provide a wiring structure of transformer substation low pressure side has reduced the mutual electrical connection of equipment of different fortune dimension units.

The utility model adopts the technical proposal that: the utility model provides a wiring structure of transformer substation low pressure side, the transformer substation includes that 3 at least main become, and the low pressure side of every main change is connected with first generating line, first generating line is connected with major network unit equipment, second generating line respectively, the second generating line is connected with distribution network unit equipment, end to end connection forms annular wiring between the first generating line or end to end connection forms annular wiring between the second generating line.

Furthermore, the first buses are connected end to end through the section breakers to form an annular wiring.

Furthermore, the second buses are connected end to end through the section breakers to form an annular wiring.

Further, the main transformer becomes a 220kV-20kV main transformer.

Further, the transformer substation comprises 4 main transformers.

Furthermore, the main network unit equipment comprises a substation transformer cabinet, a capacitor cabinet, a reactive compensation cabinet, a grounding transformer cabinet, a bus equipment cabinet and a main transformer incoming line cabinet.

Further, the distribution network unit equipment comprises an outgoing line cabinet.

The utility model has the advantages that:

the utility model relates to a wiring structure of transformer substation low pressure side, every owner become to be connected with first generating line, and the first generating line connects major network unit equipment and second generating line respectively, and the second generating line connects and joins in marriage net unit equipment, and end to end connection forms annular wiring between the first generating line or end to end connection forms annular wiring between the second generating line, overcomes the equipment of the different fortune dimension units of prior art and thoughtlessly links together, can't realize the technical problem of physical isolation; the electric connection among the devices of different operation and maintenance units is reduced, the management interfaces of different operation and maintenance units are distinguished, and the cross operation is avoided, so that the work management efficiency is improved.

Drawings

FIG. 1 is a main wiring diagram of a conventional 220kV transformer substation;

fig. 2 is a schematic view of a specific embodiment of a wiring structure on a low-voltage side of a transformer substation according to the present invention;

fig. 3 is a schematic diagram of another embodiment of the wiring structure on the low-voltage side of the transformer substation of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The utility model provides a wiring structure of transformer substation low pressure side, the transformer substation includes that 3 at least main become, and the low pressure side of every main change is connected with first generating line, and first generating line is connected with major network unit equipment, second generating line respectively, and the second generating line is connected with distribution network unit equipment, and end to end connection forms annular connection between the first generating line or end to end connection forms annular connection between the second generating line. The utility model discloses a wiring structure overcomes the equipment of the different fortune dimension units of prior art and thoughtlessly connects together, can't realize the technical problem that the physics was kept apart, has reduced the electrical contact between the equipment of different fortune dimension units, has divided the management interface of different fortune dimension units clearly, and the equipment that can realize the management of different fortune dimension units independently arranges the physics and keeps apart, and the operation of guarantee distribution network high reliability has stopped cross operation to work management efficiency has been improved.

The following is a specific description of the wiring structure on the low-voltage side of the substation:

referring to fig. 2, fig. 2 is a schematic diagram of a specific embodiment of a wiring structure of a low-voltage side of a transformer substation according to the present invention, which illustrates a case where an end-to-end connection between first bus bars forms an annular wiring; referring to fig. 3, fig. 3 is a schematic diagram of another embodiment of the wiring structure of the low voltage side of the transformer substation, which illustrates a case that the second bus bars are connected end to form a circular wiring. In fig. 2 and 3, the main transformer is a 220kV-20kV main transformer, and the substation includes 4 main transformers such as #1, #2, #3 and #4, wherein a double-bus double-section connection (not shown) can be adopted at the 220kV side, each main transformer connects one section of 20kV bus (i.e. the first bus), and then another section of bus (i.e. the second bus) is led out from the section of bus; taking a #1 main transformer as an example, the #1 main transformer is connected with a 1AM bus, and the 1AM bus is connected with a 1BM bus; the first bus has 1AM, 2AM, 3AM and 4AM, the second bus has 1BM, 2BM, 3BM and 4BM, the first bus connects the unit equipment of the major network, the unit equipment of the major network includes station transformer cabinet, capacitor cabinet, reactive compensation cabinet (not shown), earthing transformer cabinet (not shown), bus equipment cabinet (not shown) and main transformer incoming line cabinet (not shown); the second bus is connected with the distribution network unit device, which is shown in the dashed line frames in fig. 2 and 3 and includes an outgoing line cabinet. In fig. 2, the first busbars are connected end to end through the section breakers to form a single-busbar section ring connection, the section breakers such as D1, D2, D3 and D4 are not connected with each other between the 4 sections of the second busbars to form a unit connection. In fig. 3, the second busbars are connected end to end through the segmented breakers to form a single-busbar segmented ring-shaped connection, the segmented breakers such as D5, D6, D7 and D8 are not connected with each other between the 4 segments of the first busbars to form a unit connection. Under the condition of meeting the requirements of 'two-wire loop closing + connection' of different buses of a 20KV looped network, the requirement that all the hybrid substations do not need to be independently arranged and physically isolated by equipment governed by an operation and maintenance unit is met. The utility model discloses on the basis of the single generating line segmentation annular wiring of high reliability, draw forth one section generating line (the second generating line promptly) again from every section 20kV generating line (being first generating line), all join in marriage net outlet cabinet and connect in the second generating line, compress the electric contact between the equipment of different fortune dimension units to every section generating line only 1 time to realize the requirement of independently arranging the physical isolation through 2 sections generating lines. The wiring structure of the low-voltage side of the transformer substation with the number of the main transformers being 3 or more than 4 is similar to the wiring structure of the 4 main transformers, and is not repeated.

Under the requirement of realizing independent arrangement physical isolation, compared with the conventional annular wiring scheme, the wiring structure scheme of the low-voltage side of the transformer substation reduces the electrical contact among the low-voltage side and the low-voltage side of the transformer substation, and can flexibly arrange the outgoing line cabinet rooms of the distribution network, thereby reducing the building area of the transformer substation. For the requirements of all mixed system substations, the second bus is connected with the first bus through a conductor, the outgoing line cabinet connected with the second bus can be independently arranged in one equipment room, the electrical connection and the physical isolation are realized, the physical isolation is independently arranged with the main network unit equipment, and the cross interference is avoided.

While the preferred embodiments of the present invention have been described, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.

Claims

1. The utility model provides a wiring structure of transformer substation low pressure side, its characterized in that, the transformer substation includes that 3 at least become the owner becomes, and the low pressure side that every owner becomes is connected with first generating line, first generating line is connected with major network unit equipment, second generating line respectively, the second generating line is connected with distribution network unit equipment, end to end connection forms annular wiring between the first generating line or end to end connection forms annular wiring between the second generating line.

2. The substation low-voltage side wiring structure according to claim 1, wherein the first busbars are connected end to end through section breakers to form a ring-shaped wiring.

3. The substation low-voltage side wiring structure according to claim 1, wherein the second busbars are connected end to end through section breakers to form a ring-shaped wiring.

4. The connection arrangement of a low voltage side of a substation according to claim 1, characterized in that said main becomes a 220kV-20kV main transformer.

5. The connection structure of a low voltage side of a substation according to any one of claims 1 to 4, wherein the substation comprises 4 main transformers.

6. The wiring structure on the low-voltage side of a transformer substation according to any one of claims 1 to 4, wherein the main network unit equipment comprises a substation transformer cabinet, a capacitor cabinet, a reactive compensation cabinet, a grounding transformer cabinet, a bus equipment cabinet and a main transformer inlet cabinet.

7. The substation low-voltage side wiring structure according to any one of claims 1 to 4, wherein the distribution network unit equipment comprises an outlet cabinet.