Substation and power supply system

Abstract

The utility model discloses a transformer station and a power supply system. The transformer substation comprises a first-stage power transformation system, a second-stage power transformation system, a first-stage bus, a second-stage bus and a second-stage bus, the second-stage power transformation system is connected with the first-stage bus through a plurality of second-stage main transformers, the output ends of the second-stage main transformers output second voltage, and the second voltage is smaller than the first voltage; the second-stage bus is divided into multiple sections, and the multiple sections of second-stage buses are connected with the output ends of the multiple second-stage main transformers in a one-to-one correspondence mode; one section of secondary bus and the other section of secondary bus in any two adjacent sections of secondary buses are used for judging whether parallel operation of the two sections of secondary buses is allowed or not through the external control hard pressing plate of the switching buscouple segmentation cabinet, the external control hard pressing plate is connected in a locking closing loop in parallel, and the switching pressing plate is used for controlling parallel operation of the two sections of secondary buses. According to the utility model, the short-time paralleling of the main transformer is improved, the load switching is realized in an uninterrupted switching mode, and the risk of shutdown production loss is reduced.

Description

Technical Field

[0001] The utility model relates to the field of power supply system control, in particular to a transformer substation and a power supply system. Background Art

[0002] Substation is an important part of the power system. As an enterprise user station, 220KV substation undertakes the important tasks of forwarding electric energy, providing system support and regulating power load throughout the plant. It plays a role in power transmission capacity and strong system stability, and is the power heart to ensure the reliability of the power supply system.

[0003] Combination Figure 1 As shown, a power supply system is shown, which is specifically: 220 kV user substation construction 3×63 MVA main transformer, voltage level 220 / 10 kV, total capacity 189MVA, 2 220 kV outgoing lines, the main transformer adopts a three-phase double-winding, oil-immersed, on-load tap-changing transformer. 10 kV outgoing line 57 feedback lines and 10 security power supply are built at one time. 220 kV adopts double busbar connection, and 10 kV adopts single busbar three-section connection. According to the system impedance under the long-term maximum operation mode provided by the system, the short-circuit current calculation result is: the effective value of the short-circuit current of the busbar on the 220kV side of the main transformer is 22.52kA, and the effective value of the short-circuit current of the 10kV busbar is 23.57kA. Since the effective value of the short-circuit current on the 10kV side is 44.99kA when the two main transformers are running in parallel, the main transformer 10kV is not allowed to run in parallel.

[0004] When equipment failure occurs during production and power outage is required for inspection and maintenance, all power outages to the busbar section load on the low-voltage side of the main transformer will cause production interruptions and lead to significant risks of losses due to power outages in subsequent production. Summary of the invention

[0005] Based on this, it is necessary to provide a substation and power supply system for the above technical problems, so as to solve the problem that when equipment failure occurs during production and power outage is required for inspection and maintenance, all equipment on the busbar carried by the secondary main transformer needs to be shut down, thereby affecting or even interrupting the continuous production of the production device, causing the risk of power outage in production, effectively improving the short-term parallel connection of the main transformer, realizing load switching in a non-power-off switching mode, and reducing the risk of production loss due to parking. Reduce the risk of continuous production power outages and provide reliable protection for the company's power supply risk resistance.

[0006] In a first aspect, a substation is provided, comprising:

[0007] A primary power transformation system, wherein the primary power transformation system outputs a first voltage through a primary bus;

[0008] A secondary power transformation system, wherein the secondary power transformation system is connected to the primary busbar through a plurality of secondary main transformers, and an output end of the secondary main transformer outputs a second voltage, wherein the second voltage is lower than the first voltage;

[0009] A secondary bus, wherein the secondary bus is divided into multiple sections, and the multiple sections of the secondary bus are connected to the output terminals of multiple secondary main transformers in a one-to-one correspondence;

[0010] Among them, one section of the secondary busbar and the other section of the secondary busbar in any two adjacent sections are controlled by the external control hard pressure plate of the busbar sectioning cabinet to realize whether the two sections of the secondary busbar are allowed to run in parallel. The external control hard pressure plate is connected in parallel in the locking and closing circuit, and the switching pressure plate is used to control the parallel operation of the two sections of the secondary busbar.

[0011] Furthermore, the external control hard pressure plate includes an external control loop lead interface, and whether one section of the secondary bus and another section of the secondary bus are allowed to run in parallel is realized through the external control hard pressure plate of the busbar segmentation cabinet.

[0012] Furthermore, the external control circuit lead interface of the external control hard pressure plate is connected to the cabinet panel of the electrical cabinet through a lead wire.

[0013] Furthermore, the primary busbars include two, a part of the multiple secondary main transformers are connected to one primary busbar, and another part of the multiple secondary main transformers are connected to another secondary busbar.

[0014] Furthermore, the first voltage is 220KV, the second voltage is 10KV, and the number of the multiple secondary main transformers is 3.

[0015] In a second aspect, a power supply system is provided, comprising: a substation according to the first aspect.

[0016] The embodiment of the utility model solves the problem that when equipment failure occurs during production and power outage is required for inspection and maintenance, all equipment on the busbar carried by the secondary main transformer needs to be powered off, thereby affecting or even interrupting the continuous production of the production device, causing the risk of power outage in production, effectively improving the short-term parallel connection of the main transformer, realizing load switching in a non-power-off switching mode, and reducing the risk of production loss due to shutdown. The risk of continuous production power outage is reduced, providing reliable protection for the enterprise's power supply risk resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0018] Figure 1 A structural block diagram of a substation provided by an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of component connection of a substation provided for an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the embodiments and drawings. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for the convenience of description, only the parts related to the utility model are shown in the drawings.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention, that is, the features of the embodiments, can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] The substation and power supply system according to the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0023] Figure 1 1 is a structural block diagram of a substation according to an embodiment of the present utility model. Figure 1 As shown, the substation according to the embodiment of the utility model specifically includes: a primary substation system, a secondary substation system and a secondary bus, wherein:

[0024] The primary substation system outputs a first voltage through the primary busbar. The secondary substation system is connected to the primary busbar through multiple secondary main transformers, and the output end of the secondary main transformer outputs a second voltage, wherein the second voltage is less than the first voltage. The secondary busbar is divided into multiple sections, and the multiple sections of the secondary busbar are connected to the output ends of multiple secondary main transformers one by one. Figure 2 As shown, one of the two adjacent secondary bus sections and the other secondary bus section can realize whether to allow the two secondary bus sections to run in parallel through the external control hard pressure plate of the busbar segmentation cabinet. The external control hard pressure plate is connected in parallel in the locking and closing circuit, and the switching pressure plate is used to control the parallel operation of the two secondary bus sections.

[0025] like Figure 2 As shown, the external control hard pressure plate includes an external control loop lead interface, and the one section of the secondary bus and the other section of the secondary bus are controlled by the external control hard pressure plate of the busbar sectioning cabinet to determine whether the two sections of the secondary bus are allowed to run in parallel.

[0026] In a specific example, the external control circuit lead interface of the external control hard pressure plate is connected to the cabinet panel of the electrical cabinet through a lead wire.

[0027] like Figure 1As shown, the primary busbars include two, part of the multiple secondary main transformers are connected to one primary busbar, and another part of the multiple secondary main transformers are connected to another secondary busbar. For example: the first voltage is 220KV, the second voltage is 10KV, and the multiple secondary main transformers are 3.

[0028] It can reduce the losses caused by power outages due to reverse load affecting the shutdown of production equipment, and realize the parallel connection of three main transformers by adding parallel pressure plates of incoming line cabinets and section cabinets. Specifically:

[0029] The 10KV section switch cabinet is equipped with an external control hard pressure plate to short-circuit the 10KV section (section I, section II) 1Q2D-39 and 1Q2D-40 terminals. Short-circuit the 10KV section (section I, section II) 1Q2D-43 and 1Q2D-44 terminals. Lead a wire from the 10KV section (section I, section II) 1Q2D-39 terminal to 3XB-1 with the line number 1Q2D-39-141. Lead a wire from the 10KV section (section I, section II) 1Q2D-44 terminal to 3XB-2 with the line number 1Q2D-44-143. Use the parallel pressure plate to connect in parallel at both ends of the closing and locking circuit. When the 1# and 2# main transformers are in operation, the parallel pressure plate can be put into use, and the 10KV busbar 912 switch can be closed to make the two main transformers run in parallel.

[0030] The connection method of 10KV sections (Sections II and III) and 10KV incoming line switch cabinet on the low-voltage side of the main transformer is the same as above.

[0031] Use the spare pressure plate 3XB to connect the two ends of the pressure plate in parallel to the two terminals of the closing and locking circuit. Short-circuit the 1Q2D empty terminals in pairs and connect the external leads to the 1:2 terminals of the cabinet pressure plate 3XB, paying attention to the line number marking. The 10KV incoming switch cabinet on the low-voltage side of the 1#, 2#, and 3# main transformers is renovated and opened. The hole diameter is based on the purchased pressure plate terminal, 4mm hole diameter, and 2 holes are turned. Bolt double nuts and gaskets to lock it. Extend the external lead wire trough to the cabinet panel. Label the external lead wire extension trough to the cabinet panel and adjust the manual switching of the pressure plate at any time according to the system operation mode.

[0032] According to the substation of the embodiment of the utility model, when equipment failure occurs during production and power outage is required for inspection and maintenance, all equipment on the busbar carried by the secondary main transformer needs to be shut down, thereby affecting or even interrupting the continuous production of the production device, causing the risk of power outage in production, effectively improving the short-term parallel connection of the main transformer, realizing load switching in a non-power-off switching mode, and reducing the risk of production loss due to shutdown. Reducing the risk of continuous production power outages provides reliable protection for the enterprise's power supply risk resistance.

[0033] In one embodiment, a power supply system is provided, including: a substation according to the above embodiment, which solves the problem that when equipment failure occurs during production and a power outage is required for inspection and maintenance, all equipment on the busbar carried by the secondary main transformer needs to be shut down, thereby affecting or even interrupting the continuous production of the production device, causing the risk of power outage in production, effectively improving the short-time parallel connection of the main transformer, realizing load switching in a non-power-off switching mode, and reducing the risk of production loss due to shutdown. The risk of continuous production power outage is reduced, providing reliable protection for the enterprise's power supply risk resistance.

[0034] In addition, other structures and functions of the power supply system according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described here.

[0035] Those skilled in the art can understand that all or part of the processes in the methods for implementing the above embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the utility model can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0036] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A substation, characterized in that: include: A primary power transformation system, wherein the primary power transformation system outputs a first voltage through a primary bus; A secondary power transformation system, wherein the secondary power transformation system is connected to the primary busbar through a plurality of secondary main transformers, and an output end of the secondary main transformer outputs a second voltage, wherein the second voltage is lower than the first voltage; A secondary bus, wherein the secondary bus is divided into multiple sections, and the multiple sections of the secondary bus are connected to the output terminals of multiple secondary main transformers in a one-to-one correspondence; Among them, one section of the secondary busbar and the other section of the secondary busbar in any two adjacent sections are controlled by the external control hard pressure plate of the busbar sectioning cabinet to realize whether the two sections of the secondary busbar are allowed to run in parallel. The external control hard pressure plate is connected in parallel in the locking and closing circuit, and the switching pressure plate is used to control the parallel operation of the two sections of the secondary busbar.

2. The substation according to claim 1, characterized in that: The external control hard pressure plate includes an external control circuit lead interface, and whether one section of the secondary bus and another section of the secondary bus are allowed to run in parallel is realized through the external control hard pressure plate of the busbar section cabinet.

3. The substation according to claim 2, characterized in that: The external control circuit lead interface of the external control hard pressure plate is connected to the cabinet panel of the electrical cabinet through a lead wire.

4. The substation according to any one of claims 1 to 3, characterized in that: The primary busbars include two, a part of the multiple secondary main transformers are connected to one primary busbar, and another part of the multiple secondary main transformers are connected to another secondary busbar.

5. The substation according to claim 4, characterized in that: The first voltage is 220KV, the second voltage is 10KV, and the number of the multiple secondary main transformers is 3.

6. A power supply system, characterized in that: include: A substation according to any one of claims 1 to 5.

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