Power supply suitable for TBM (Tunnel Boring Machine) in tunnel engineering

Abstract

The utility model relates to a power supply suitable for a tunnel engineering TBM, which comprises a first HGIS, a 10kV power supply and a 20kV power supply, the 10kV power supply comprises a 1 # main transformer and a 10kV power distribution device prefabricated cabin, the 20kV power supply comprises a second HGIS, a 2 # main transformer and a 20kV power distribution device prefabricated cabin, and the first HGIS adopts double circuit breakers for respectively controlling the 10kV power supply and the 20kV power supply; the first HGIS and the 10kV power supply are installed on the first steel platform, the 20kV power supply is installed on the second steel platform, the first steel platform and the second steel platform are arranged in parallel, the bottoms of the first steel platform and the second steel platform are supported by steel supporting legs, and the steel supporting legs are connected with a foundation through bolts. According to the utility model, independent operation of the 20kV mobile power supply and the 10kV power supply can be realized, and carrying, transferring, dismounting and mounting are convenient.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, specifically to a power supply suitable for use in tunnel engineering TBMs. Background Technology

[0002] Currently, most medium-to-long tunnel excavation construction in China adopts segmented construction, combining the main tunnel with excavation transport adits. TBMs (Tunnel Boring Machines) are commonly used in tunnel construction, and the power supply for the TBM needs to be relocated and reused across multiple adits. During construction, each adit is typically equipped with a fixed power supply of 10kV or lower to power all equipment except the TBM. The TBM is usually powered by a 20kV portable power supply, which needs to be moved between different adits according to the construction progress. Therefore, the design of the portable power supply for the TBM has high standards.

[0003] Because the TBM uses a 20kV power supply while other equipment uses a 10kV power supply, existing tunnel construction power supplies are often designed with three voltage levels of transformers. The secondary windings of these transformers at each voltage level must operate simultaneously. After the power station is built, daily operation and maintenance require paying electricity fees based on the full load approved by the power department. This means that even when the TBM is off-site, the power maintenance costs cannot be reduced. Furthermore, existing tunnel construction power supplies mainly use single circuit breaker control. When the TBM power distribution equipment needs to be moved from one branch tunnel to another, the circuit breaker must be disconnected first, and then the TBM's mobile power supply must be transferred to the other branch tunnel. This process affects the power supply to other equipment in the branch tunnel where the transfer was originally located; that is, the 20kV mobile power supply and the 10kV power supply cannot operate independently.

[0004] Furthermore, for the power supply of TBMs used in tunnel construction, it is necessary to consider the ease of handling and relocation, as well as the ease of disassembly and assembly. Therefore, this utility model designs a power supply suitable for use with TBMs in tunnel construction to meet the usage requirements of the above application scenarios. Utility Model Content

[0005] This utility model discloses a power supply suitable for use in TBMs in tunnel engineering, which enables the 20kV portable power supply and the 10kV power supply to operate independently without affecting each other. The overall structure is compact and easy to transport, move and disassemble.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] The power supply for TBMs used in tunnel engineering includes a first HGIS, a 10kV power supply, and a 20kV power supply. The 10kV power supply includes a No. 1 main transformer and a 10kV distribution device prefabricated cabin. The 20kV power supply includes a second HGIS, a No. 2 main transformer, and a 20kV distribution device prefabricated cabin. The first HGIS is connected to the second HGIS. The first HGIS uses double circuit breakers to control the 10kV and 20kV power supplies respectively. The first HGIS and the 10kV power supply are installed on a first steel platform, and the 20kV power supply is installed on a second steel platform. The first and second steel platforms are arranged in parallel. The bottom of both the first and second steel platforms is supported by steel legs, which are bolted to the foundation.

[0008] Furthermore, the height of the steel outriggers is adjustable.

[0009] Furthermore, both the No. 1 and No. 2 main transformers are oil-immersed air-cooled transformers.

[0010] Furthermore, on the first steel platform, from left to right, are the first HGIS, the No. 1 main transformer, and the 10kV distribution equipment prefabrication compartment. The No. 1 main transformer is connected to the first HGIS via an overhead bushing, and the low-voltage side of the No. 1 main transformer is connected to the 10kV distribution equipment prefabrication compartment via a fully insulated copper core single-core cable. On the second steel platform, from left to right, are the second HGIS, the No. 2 main transformer, and the 20kV distribution equipment prefabrication compartment. The No. 2 main transformer is connected to the second HGIS via an overhead bushing, and the low-voltage side of the No. 2 main transformer is connected to the 20kV distribution equipment prefabrication compartment via a fully insulated copper core single-core cable.

[0011] Furthermore, the 10kV power distribution prefabrication compartment includes a 10kV medium-voltage power distribution cabinet, a 10kV capacitor compensation device, a 10kV grounding transformer and station service transformer assembly. The above devices are arranged in separate zones using partitions, and are connected by armored, fully insulated three-core copper wires. The 20kV power distribution prefabrication compartment contains a 20kV medium-voltage power distribution cabinet and a secondary equipment cabinet. The 20kV medium-voltage power distribution cabinet and the secondary equipment cabinet are separated by partitions.

[0012] Furthermore, a cable truss is installed on the side of the first steel platform near the end of the first HGIS, and a disconnecting switch and a surge arrester are installed separately on the incoming side of the first HGIS.

[0013] Furthermore, bolts are pre-installed at the ground level of the foundation, and the bottom of the steel support legs is connected to the bolts.

[0014] Furthermore, the apparent power of the No. 1 main transformer and the No. 2 main transformer is 5MVA to 10MVA.

[0015] Furthermore, both the first HGIS and the second HGIS are 110kV / 66kV outdoor HGIS.

[0016] The power supply designed in this invention adopts a double-circuit breaker main wiring configuration with one incoming line and two transformer outgoing lines. This allows the 10kV and 20kV power supplies to operate independently. Relocation of the 20kV power supply does not affect the normal operation of the 10kV power supply, avoiding the impact of TBM power distribution equipment relocation on power supply usage at non-relocation sites. The independent operation of the 10kV and 20kV power supplies can meet the requirements for batch approval of operation or shutdown of different power supplies. In actual projects, this effectively reduces the power maintenance costs of redundant power during the later stages of construction when the TBM equipment is off-site. Furthermore, the 20kV power supply requiring relocation and the 10kV power supply not requiring relocation are respectively mounted on different steel platforms, and the equipment for each power supply is assembled using a modular prefabricated cabin structure. In practical applications, this allows for rapid transportation, relocation, and reconstruction of the power supply along with the TBM's relocation needs, greatly improving the flexibility and efficiency of project construction. Attached Figure Description

[0017] Figure 1 This is the main wiring diagram of the power supply in the embodiment;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 for Figure 1 Enlarged view at point B in the middle;

[0020] Figure 4 for Figure 1 Enlarged view at point C;

[0021] Figure 5 This is a plan view of the power supply layout in the embodiment;

[0022] Figure 6 for Figure 5 Vertical cross-sectional view of a 20kV power supply;

[0023] Figure 7 for Figure 5 Vertical cross-sectional view of a 10kV power supply. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] This embodiment discloses a power supply suitable for use in TBMs (Tunnel Boring Machines) in tunnel engineering, mainly including a first HGIS (High-Intensity Grid Interconnection System), a 10kV power supply, and a 20kV power supply, wherein the 20kV power supply is used to power the TBM equipment. To ensure that the 10kV and 20kV power supplies can operate independently without affecting each other, the power supply in this embodiment adopts a double-circuit breaker main wiring configuration with one incoming line and two transformer outgoing lines, such as... Figures 1 to 4 As shown, the first HGIS adopts a 110kV / 66kV outdoor HGIS, which has a compact structure, reducing the equipment's footprint and facilitating relocation. The first HGIS employs a dual-circuit breaker design, its crucial role being to precisely control the operation of the 10kV and 20kV power supplies separately, allowing each power supply to operate independently without interference. To facilitate the relocation of the 20kV power supply, such as... Figures 5 to 7 As shown, in this embodiment, the aforementioned equipment is installed on two steel platforms. The first HGIS and the 10kV power supply are installed together on the first steel platform, while the 20kV power supply is installed on the second steel platform. The first and second steel platforms are arranged side-by-side for easy wiring. Both the first and second steel platforms are supported by steel legs and fixed to the foundation to prevent localized settlement. Considering the possibility of uneven terrain, the steel legs in this embodiment are height-adjustable, with a precise height adjustment range of 0-300mm. When the equipment is moved to the installation site, the height of the steel legs can be adjusted to meet the flatness requirements of the equipment on uneven terrain, reducing site costs and construction time in harsh environments. This embodiment uses an independent foundation, saving on civil engineering excavation and reducing the amount of civil engineering work. Anchor bolts are pre-installed at the foundation's ground level position for connection to the bottom of the steel legs. During on-site installation, the equipment, along with the steel platform, is hoisted to the corresponding installation position, and the nuts are then secured on-site. Assembly and disassembly are both very simple and quick.

[0026] The 10kV power supply mainly includes the No. 1 main transformer and the prefabricated 10kV distribution equipment cabin, such as... Figure 7As shown, the first HGIS, the No. 1 main transformer, and the 10kV distribution equipment prefabricated cabin are installed sequentially from left to right on the first steel platform. A cable truss is installed on-site next to the first HGIS on the side of the first steel platform to organize and support the cables, ensuring the rationality and safety of the cable layout. Simultaneously, a disconnecting switch and surge arrester are separately installed on the incoming side of the first HGIS, further enhancing the protection capability of the entire power supply system against various electrical anomalies, and meeting the principle of non-interference between line construction and station area construction while facilitating relocation, maintenance, and power outages. The No. 1 main transformer is connected to the first HGIS via an overhead bushing, and the low-voltage side of the No. 1 main transformer is connected to the 10kV distribution equipment prefabricated cabin using a fully insulated copper core single-core cable. The No. 1 main transformer is an oil-immersed, air-cooled transformer, and a transformer with an apparent power of 5MVA to 10MVA can be selected. The 10kV power distribution prefabrication cabin is a modular prefabrication cabin. Inside, there are 10kV medium-voltage distribution cabinets, 10kV capacitor compensation devices, 10kV grounding transformers and station service transformers. The above devices are installed in the factory and are arranged in separate areas using partitions. The devices are connected by armored, fully insulated three-core copper wires, which can ensure efficient power transmission and provide good insulation protection.

[0027] The 20kV power supply mainly includes the second HGIS, the No. 2 main transformer, and the prefabricated 20kV distribution equipment cabin. The second HGIS uses a single circuit breaker control and also adopts a 110kV / 66kV outdoor HGIS. Figure 6 As shown, on the second steel platform, from left to right, the second HGIS, the No. 2 main transformer, and the 20kV distribution equipment prefabricated compartment are installed sequentially. The No. 2 main transformer is connected to the second HGIS via an overhead bushing. The low-voltage side of the No. 2 main transformer is connected to the 20kV distribution equipment prefabricated compartment via a fully insulated copper core single-core cable. The second HGIS is connected to the first HGIS. The No. 2 main transformer is an oil-immersed air-cooled transformer, and a transformer with an apparent power of 5MVA to 10MVA can be selected. The 20kV distribution equipment prefabricated compartment is a modular prefabricated compartment, which houses a 20kV medium-voltage distribution cabinet and some secondary equipment cabinets. These devices are installed in the factory and are arranged in separate zones using partitions. The 20kV medium-voltage distribution cabinet and the secondary equipment cabinets are also separated by partitions, making the operating space of each device relatively independent, reducing mutual interference, and ensuring the stable operation of the entire distribution equipment prefabricated compartment. The No. 2 main transformer is connected to the incoming line of the 20kV distribution equipment prefabricated compartment using an armored fully insulated single-core cable.

[0028] In this embodiment, the reactive power compensation device, grounding transformer, high and medium voltage power distribution device, secondary integrated automation device and other devices located in the electrical equipment area are all set up with a prefabricated cabin integrated structure. Each electrical prefabricated cabin module is of moderate size, which facilitates overall transportation and on-site hoisting, reducing the amount of on-site construction and installation. The electrical equipment layout area must meet the requirement of direct access by road.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power supply suitable for use with a tunneling machine TBM, characterized in that: The first HGIS, 10kV power supply and 20kV power supply are included, the 10kV power supply includes 1# main transformer and 10kV power distribution device prefabricated cabin, the 20kV power supply includes second HGIS, 2# main transformer and 20kV power distribution device prefabricated cabin, the first HGIS is connected with the second HGIS, the first HGIS adopts double circuit breaker for controlling 10kV power supply and 20kV power supply respectively, the first HGIS and 10kV power supply are installed on the first steel platform, the 20kV power supply is installed on the second steel platform, the first steel platform and the second steel platform are arranged in parallel, the bottom of the first steel platform and the second steel platform are supported by steel legs, and the steel legs are connected with the foundation by bolts.

2. The power supply suitable for use with a tunneling TBM according to claim 1, characterized in that: The height of the steel leg is adjustable.

3. The power supply suitable for use in a tunneling TBM according to claim 1, characterized in that: The 1# main transformer and 2# main transformer are oil-immersed air-cooled transformers.

4. The power supply suitable for use in a tunneling TBM according to claim 1, characterized in that: On the first steel platform, the first HGIS, 1# main transformer and 10kV power distribution device prefabricated cabin are arranged from left to right, the 1# main transformer is connected with the first HGIS by overhead bushing, and the low-voltage side of the 1# main transformer is connected with the 10kV power distribution device prefabricated cabin by full-insulation copper core single-core cable; on the second steel platform, the second HGIS, 2# main transformer and 20kV power distribution device prefabricated cabin are arranged from left to right, the 2# main transformer is connected with the second HGIS by overhead bushing, and the low-voltage side of the 2# main transformer is connected with the 20kV power distribution device prefabricated cabin by full-insulation copper core single-core cable.

5. The power supply suitable for use in a tunneling TBM according to claim 1, characterized in that: The 10kV power distribution device prefabricated cabin includes 10kV medium voltage power distribution cabinet, 10kV capacitor compensation device, 10kV grounding transformer and station transformer complete device, the above devices are arranged by partitioning by partition plates, and the above devices are connected by armored full-insulation three-core copper conductor; the 20kV power distribution device prefabricated cabin is provided with 20kV medium voltage power distribution cabinet and secondary equipment cabinet, and the 20kV medium voltage power distribution cabinet and the secondary equipment cabinet are arranged by partitioning by partition plates.

6. The power supply suitable for use in a tunneling TBM according to claim 1, characterized in that: A cable truss is arranged near one end of the first HGIS on the side of the first steel platform, and a disconnector and a lightning arrester are separately arranged on the incoming line side of the first HGIS.

7. The power supply suitable for use in a tunneling TBM according to claim 1, characterized in that: The foundation is provided with bolts at the out-pavement position, and the bottom of the steel leg is connected with the bolts.

8. The power supply suitable for use in a tunneling TBM according to claim 1, characterized in that: The apparent power of the 1# main transformer and 2# main transformer is 5MVA-10MVA.

9. The power supply suitable for use in a tunneling TBM according to claim 1, characterized in that: The first HGIS and the second HGIS are both 110kV / 66kV outdoor HGIS.

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