A high-capacity modular double-deck arranged substation system

Abstract

A large-capacity modular double-layer arrangement substation system relates to the field of electric power construction such as new energy and distributed power supply, and is mainly designed to solve the problem of large land occupation of traditional substations. It comprises a transformer in an accident oil pool, a steel wheel of the transformer is arranged on a track of a foundation, support columns of a steel structure platform are fixed on the foundation, a container is fixed on the steel structure platform, and high-voltage switch equipment is fixed on an outer side wall of the container. A high-voltage circuit breaker of the high-voltage switch equipment is connected with a high-voltage isolation / grounding switch through a conductor, the high-voltage isolation / grounding switch is connected with a high-voltage bushing, the high-voltage circuit breaker is connected with a high-voltage connection line of a high-voltage bushing of the transformer through a high-voltage isolation plug, and a connection cable between a low-voltage bushing of the transformer and an outdoor terminal of a medium-voltage porcelain bushing type cable is connected through a low-voltage isolation plug. The advantage is that the land occupation can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of power construction, such as new energy and distributed power sources, and specifically to a large-capacity modular double-layer substation system. Technical Background

[0002] In traditional substations and the currently popular modular substations, the equipment and modules are basically arranged in a planar layout, and the transformers are arranged separately. The effective area used by the substation is the area occupied by the main transformer plus the area required by other equipment. Mountainous areas are rich in wind energy resources. With the vigorous development of renewable energy and the continuous advancement of wind turbine technology, high-efficiency, high-power wind turbine units are constantly achieving new results. While being applied in new projects, these units are also being upgraded from smaller, older wind turbine units. However, the existing small-capacity wind farms have power collection lines designed for the 35kV or 10kV voltage levels corresponding to these smaller units. After the wind turbines are upgraded, the original voltage level channels cannot meet the transmission needs of large-capacity power. Expanding the channels would significantly increase the construction and renovation costs of the wind farm due to land acquisition for power collection lines. Therefore, the general approach is to increase the operating voltage of the power collection lines within the existing voltage level channels to meet the power transmission needs.

[0003] Increasing the voltage of the collector line requires increasing the voltage at the wind turbine's output, which necessitates raising the voltage of the wind turbine tower substation system. For wind turbines of 10MW and above, this voltage is typically increased to 66kV or 110kV. However, this voltage increase presents another challenge: designing a traditional substation increases the footprint of the tower substation. In mountainous wind farms, the flat land available for the turbine towers is often insufficient to accommodate a tower substation. Solving this problem by leveling the site requires significant investment in civil engineering, increasing the construction cost of new wind farms and placing financial pressure on the renovation of existing ones. This jeopardizes the operational efficiency of wind farms and severely impacts the construction and upgrading of wind farms in mountainous areas.

[0004] To thoroughly address these issues, a "large-capacity modular double-layer substation system" has been developed. This system meets the requirements for expanding the collection line capacity and reducing the construction cost of tower substations in the construction and renovation of wind power farms in mountainous areas. Furthermore, this technological achievement is also suitable for the construction of 66-110kV substations under site constraints, playing a positive role in the development of renewable energy and infrastructure construction, and opening up a completely new substation construction model. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a large-capacity modular double-layer substation system. This system breaks through the design concept and construction method of traditional substations and modular substations. It constructs a fully functional substation system using only the effective land area of ​​the main transformer, which meets the requirements of expanding the collection line capacity and reducing the construction cost of tower substations in the construction and renovation projects of wind power plants in mountainous areas.

[0006] The purpose of this utility model is achieved as follows: it includes a transformer, which is an oil-immersed transformer. The transformer is placed in an emergency oil tank. The emergency oil tank is provided with two strip foundations. Tracks are laid on the two strip foundations. The upper surface of the tracks is flush with the ground. The tracks extend beyond the emergency oil tank by the length of one transformer body. A steel wheel is provided at the bottom of the transformer. The steel wheel at the bottom of the transformer is placed on the track.

[0007] A steel structure platform is installed above the transformer. The supporting columns of the steel structure platform are located outside the emergency oil pool. The lower end of the supporting columns is fixed to the foundation, and the container is fixed to the top of the steel structure platform.

[0008] The container houses medium-voltage switchgear, low-voltage distribution cabinets, secondary integrated protection panels, and auxiliary system cabinets. A fireproof partition wall is fixed in the middle of the container; the medium-voltage switchgear and low-voltage distribution cabinets are located on one side of the fireproof partition wall, while the secondary integrated protection panel, auxiliary system cabinets, and air conditioners are located on the other side. Several exhaust fans and industrial air conditioners are also installed on the container. With the medium-voltage system protection decentralized, the secondary terminals of the current and voltage transformers in the medium-voltage switchgear are led out via control cables and connected to the corresponding protection devices in the secondary cabinets. In this decentralized protection configuration, the protection devices in each switchgear transmit various information via fiber optic communication interfaces to the system host in the secondary cabinets through fiber optic cables or optical fibers, conforming to the IEC 61850 protocol. This fiber optic channel can also receive various commands from the system host.

[0009] The high-voltage switchgear is a three-phase independent HGIS type outdoor high-voltage switchgear. The high-voltage switchgear and the high-voltage bushing of the transformer are located on the same side, and the high-voltage switchgear is fixed on the outer wall of the container.

[0010] The high-voltage circuit breaker and the high-voltage isolating / grounding switch of the high-voltage switchgear are connected by a conductor, and the high-voltage isolating / grounding switch is connected to an HGIS high-voltage bushing.

[0011] The high-voltage circuit breaker is connected to the high-voltage bushing of the HGIS connected by the current transformer and the high-voltage connection line of the high-voltage bushing of the transformer through a high-voltage isolation plug, that is, the moving contact and the stationary contact of the isolation plug are plugged in and plugged in; the moving contact is fixed on the high-voltage connection line on the transformer side, and the stationary contact is fixed on the high-voltage connection line of the high-voltage switchgear.

[0012] The post insulator is fixed to the supporting column of the steel structure platform, and the post insulator supports the high-voltage conductor (high-voltage connecting line).

[0013] The connecting cable between the low-voltage bushing of the transformer and the medium-voltage porcelain bushing cable outdoor terminal is connected by a low-voltage isolating plug. The outgoing line of the medium-voltage switchgear is led out by the cable. The other side of the cable is the porcelain bushing cable outdoor terminal. The porcelain bushing cable outdoor terminal is installed on the steel structure platform at the bottom of the container. An isolating static plug is installed at the end of the porcelain bushing cable outdoor terminal. An isolating dynamic plug is installed on the low-voltage outgoing bushing of the transformer through the conductor.

[0014] The transformer's terminal box is fixed to the side wall of the transformer. The cables leading out from it and connected to the secondary devices in the upper container are designed as trailing cables before entering the cable tray.

[0015] When used for overhead incoming lines, surge arresters should be installed on line transfer towers. When surge arresters cannot be installed on transfer towers or in other non-overhead incoming lines, surge arresters should preferably be placed below the high-voltage bushings of the transformer. The surge arresters are fixed to the transformer by supports and can be moved together with the main transformer.

[0016] The advantages of this utility model are:

[0017] Low-voltage switchgear and secondary system equipment are integrated into the container and placed on a steel structure platform above the transformer, reducing the floor space required. Steel wheels at the bottom of the transformer are placed on rails, facilitating installation and maintenance. When maintenance is needed, the main transformer can be pushed into the maintenance position for easy hoisting. Medium and low-voltage switchgear are also integrated into the container, with the secondary equipment area physically separated from the low-voltage equipment area to meet the environmental requirements for the operation of secondary electronic equipment.

[0018] The high-voltage connection lines between the transformer's high-voltage bushings and the high-voltage switch, and the connection lines between the main transformer's low-voltage bushings and the switchgear, all adopt plug-in connection of the moving and stationary contacts of the isolating switch; this allows for easy movement of the transformer out to the maintenance position and into the working position.

[0019] The high-voltage switchgear uses three-phase independent HGIS type outdoor equipment, which is vertically installed on the side wall of the container above the main transformer. This facilitates wiring with the transformer while effectively isolating it from low-voltage equipment and secondary equipment.

[0020] This utility model employs a modular approach to the construction of the substation, aiming to better address challenges such as complex terrain in mountainous wind farms, saving substation construction land area, reducing on-site workload, and shortening the on-site construction period. Secondly, considering the dimensions of the main transformer, high-voltage switch, and containers, all components can be transported using a single semi-trailer, achieving the goal of delivering all equipment to the site in one trip. Furthermore, to reduce on-site workload, after the equipment is integrated by the manufacturer, all testing, experimentation, and commissioning of the entire substation can be conducted under on-site supervision or at the integration manufacturer. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the container in this utility model. Detailed Implementation

[0023] The following is combined Figure 1 and Figure 2 The present invention will be further described below;

[0024] It includes a transformer 1, which is an oil-immersed transformer. The transformer is placed in an emergency oil tank. The emergency oil tank has two strip foundations 16, and a track 17 is laid on the two strip foundations. The upper surface of the track is flush with the ground. The track extends out of the emergency oil tank by the length of the transformer body. The bottom of the transformer is equipped with steel wheels, which are placed on the track. When maintenance is required, the transformer can be pushed out of the emergency oil tank for easy hoisting.

[0025] A steel structure platform 23 is installed above the transformer. The supporting columns of the steel structure platform are located outside the emergency oil pool, and the lower ends of the supporting columns are fixed to the foundation 16. A container 13 is fixed to the top of the steel structure platform. The container houses a medium-voltage switchgear 19, a low-voltage distribution cabinet 20, a secondary integrated protection panel 21, and an auxiliary system panel 22. A fireproof partition wall 24 is fixed in the middle of the container. The medium-voltage switchgear 19 and the low-voltage distribution cabinet 20 are located on one side of the fireproof partition wall, while the secondary integrated protection panel, auxiliary system panel, and air conditioner are located on the other side. Several exhaust fans 14 and industrial air conditioners 15 are also installed on the container. In the case of decentralized protection for medium-voltage systems, the secondary terminals of the current and voltage transformers in medium-voltage switchgear 19 are led out via control cables and connected to the corresponding protection devices in the secondary switchgear. Under this protection decentralization, the protection devices in each switchgear transmit various information via fiber optic communication interfaces to the system host in the secondary switchgear according to the IEC61850 protocol. This fiber optic channel can also receive various commands from the system host. The equipment and systems within the container are consistent with the requirements of general substations and represent existing technology.

[0026] The high-voltage switchgear 6 is a three-phase independent HGIS type outdoor high-voltage switchgear. The high-voltage switchgear and the high-voltage bushing 2 of the transformer are located on the same side. The high-voltage switchgear is fixed on the outer wall of the container.

[0027] The high-voltage circuit breaker 7 and the high-voltage isolating / grounding switch 8 of the high-voltage switchgear are connected by a conductor, and the high-voltage isolating / grounding switch 8 is connected to the HGIS high-voltage bushing 10.

[0028] The high-voltage circuit breaker 7 is connected to the high-voltage bushing 10 of the HGIS connected by the current transformer 9 and the high-voltage connection line of the high-voltage bushing 2 of the transformer through the high-voltage isolation plug 4, that is, the moving contact and the stationary contact of the isolation plug are plugged in and plugged in; the moving contact is fixed on the high-voltage connection line on the transformer side, and the stationary contact is fixed on the high-voltage connection line of the high-voltage switchgear.

[0029] The post insulator 18 is fixed on the support column of the steel structure platform, and the post insulator supports the high-voltage conductor (high-voltage connection line).

[0030] The connecting cable between the low-voltage bushing 3 of the transformer and the medium-voltage porcelain bushing cable outdoor terminal 12 is connected by a low-voltage isolation plug 5. The outgoing line of the medium-voltage switchgear is led out through the cable, and the other side of the cable is a porcelain bushing cable outdoor terminal. The porcelain bushing cable outdoor terminal is installed on the steel structure platform at the bottom of the container. An isolation static plug is installed at the end of the porcelain bushing cable outdoor terminal. An isolation dynamic plug is installed on the low-voltage outgoing bushing of the transformer through the conductor. When the transformer returns from the maintenance position to the working position, the low-voltage lead of the main transformer will be conveniently connected through this set of isolation plugs.

[0031] The transformer's terminal box 25 is fixed to the side wall of the transformer. The cables leading out from it, connecting to the secondary devices in the upper container, are designed as trailing cables before entering the cable trays. This allows the secondary cables to be reconnected when the transformer is moved to the maintenance position, and they do not need to be reconnected when the transformer returns to the working position after maintenance, thus improving the efficiency of transformer maintenance. It also avoids potential wiring errors during the disassembly and restoration of secondary cables, which could affect maintenance efficiency.

[0032] When used for overhead incoming lines, surge arrester 11 should be installed on the line transfer tower; when it is not possible to install surge arrester on the transfer tower or in other non-overhead incoming lines, surge arrester should preferably be placed below the high-voltage bushing of the transformer. The surge arrester is fixed to the transformer by a support and can be moved together with the main transformer.

[0033] 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 large-capacity modular double-layer substation system, comprising a transformer (1) placed in an emergency oil sump, characterized in that: The accident oil pool is equipped with two strip foundations (16), and a track (17) is laid on the two strip foundations. The upper surface of the track is flush with the ground. The transformer is equipped with steel wheels at the bottom, and the steel wheels at the bottom of the transformer are placed on the track. A steel structure platform (23) is set above the transformer. The supporting columns of the steel structure platform are located outside the accident oil pool. The lower end of the supporting columns is fixed on the foundation (16). The container (13) is fixed on the top of the steel structure platform. The container is equipped with a medium-voltage switchgear (19), a low-voltage distribution cabinet (20), a secondary integrated protection panel (21), and an auxiliary system panel (22). A fireproof partition wall (24) is fixed in the middle of the container. The medium-voltage switchgear (19) and the low-voltage distribution cabinet (20) are located on one side of the fireproof partition wall, while the secondary integrated protection panel (21), the auxiliary system panel (22), and the air conditioner are located on the other side of the fireproof partition wall. The high-voltage switchgear (6) and the high-voltage bushing (2) of the transformer are located on the same side, and the high-voltage switchgear is fixed on the outer wall of the container; The high-voltage circuit breaker (7) of the high-voltage switchgear is connected to the high-voltage isolating / grounding switch (8) by a conductor, and the high-voltage isolating / grounding switch is connected to the HGIS high-voltage bushing (10); The high voltage circuit breaker (7) is connected to the high voltage bushing (10) of the HGIS connected by the current transformer (9) and the high voltage connection line of the high voltage bushing (2) of the transformer through the high voltage disconnect plug (4), that is, the moving contact and the stationary contact of the disconnect plug are plugged in and connected; the moving contact is fixed on the high voltage connection line on the transformer side, and the stationary contact is fixed on the high voltage connection line of the high voltage switchgear. The connecting cable between the low-voltage bushing (3) of the transformer and the medium-voltage porcelain bushing cable outdoor terminal (12) is connected by a low-voltage isolation plug (5). The outgoing line of the medium-voltage switchgear is led out by the cable. The other side of the cable is a porcelain bushing cable outdoor terminal. The porcelain bushing cable outdoor terminal is installed on the steel structure platform at the bottom of the container. An isolation static plug is installed at the end of the porcelain bushing cable outdoor terminal. An isolation dynamic plug is installed on the low-voltage outgoing bushing of the transformer through the conductor.

2. The large-capacity modular double-layer substation system according to claim 1, characterized in that: The transformer is an oil-immersed transformer, and the rail extends beyond the accident oil pool by the length of the transformer body.

3. The large-capacity modular double-layer substation system according to claim 1 or 2, characterized in that: The container is also equipped with several exhaust fans (14) and industrial air conditioners (15).

4. The large-capacity modular double-layer substation system according to claim 1 or 2, characterized in that: The high-voltage switchgear (6) is a three-phase independent HGIS type outdoor high-voltage switchgear.

5. The large-capacity modular double-layer substation system according to claim 1 or 2, characterized in that: The post insulator (18) is fixed on the support column of the steel structure platform, and the post insulator supports the high voltage conductor.

6. The large-capacity modular double-layer substation system according to claim 1 or 2, characterized in that: the transformer The terminal box (25) is fixed on the side wall of the transformer. The cables leading out from it and connected to the secondary devices in the upper container are designed as drag cables before entering the cable tray.

7. The large-capacity modular double-layer substation system according to claim 1 or 2, characterized in that: The surge arrester (11) is installed below the high-voltage bushing of the transformer and is fixed to the transformer by a support.

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