High-altitude 1000kV substation station power system

Abstract

The utility model provides a high altitude 1000kV substation station power supply system with higher reliability relates to substation station power supply technical field. High altitude 1000kV substation station power supply system, including station transformer I, station transformer II, spare power station transformer, first busbar I section, first busbar II section and first busbar III section, the spare power station transformer is accessed from the station, and its low voltage side is connected with first busbar II section, is equipped with the tie -in circuit breaker between first busbar II section and first busbar I section and between first busbar II section and first busbar III section respectively, is equipped with the access line I and access line II of parallel setting on the working section busbar III section, is equipped with station transformer VI on the access line I, is equipped with station transformer VII on the access line II, the access line I is connected with first busbar I section, the access line II is connected with first busbar III section, and double power automatic transfer switch is equipped between the access line II and access line I.

Description

Technical Field

[0001] This utility model relates to the field of substation power supply technology, specifically to a 1000kV substation power supply system at high altitude. Background Technology

[0002] A typical 1000kV substation has a station service capacity of 3150kVA. Currently, the altitude of most existing 1000kV substations does not exceed 1300 meters. In a typical 1000kV substation, the 380V station service busbar is divided into two working busbars based on the station service power supply. The station service power supply, taken from the 1000kV side busbars of the two 1000kV main transformers, is stepped down to 35kV by a 1000kV station service transformer and then directly connected to the 35kV station service transformer via a 35kV cable. After further step-down, the power is connected to sections I and II of the 380V station service working busbar. The backup power supply is drawn from a dedicated 35kV line from the nearest 1000kV substation. Considering cable connection, the power is stepped down by a 35kV station service transformer and then connected to both sections of the 380V working busbar.

[0003] The 380V working busbar adopts a single busbar sectionalized connection method. During normal operation, the two working busbar sections operate separately. If either working power supply fails, the backup power supply will automatically connect to the working busbar in place of the faulty power supply. If either of the two station service power supplies fails, a third power supply can operate both working busbar sections via the sectionalizing switch. No two station service power supplies may operate in parallel during the current and future phases. This is similar to the power supply system of the 1000kV UHV substation's primary step-down station disclosed in authorization announcement number CN202424167U.

[0004] High-altitude substations generally refer to substations located at altitudes exceeding 3,500 meters. Due to the terrain and inconvenient transportation, high-altitude substations require on-site assembly of the main transformers. However, during on-site assembly, factors such as vapor drying and power outages during transformer hoisting can significantly impact the reliability of the main transformer equipment and may even lead to safety accidents. Therefore, higher requirements are placed on the reliability of the power supply for high-altitude substations. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a power supply system for a 1000kV substation at high altitude with higher power reliability.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a 1000kV substation power supply system at high altitude, including substation transformer I, substation transformer II, backup power substation transformer, first busbar section I, first busbar section II and first busbar section III;

[0007] The backup power station transformer is connected from outside the station, and its low-voltage side is connected to the first busbar section II.

[0008] A connecting circuit breaker is provided between the first busbar section II and the first busbar section I, and between the first busbar section II and the first busbar section III;

[0009] The station service transformer I is connected to the low-voltage side of the No. 1 main transformer. The low-voltage side of the station service transformer I is connected to the working section busbar I section via the first busbar section I and the station service transformer III in sequence.

[0010] The station service transformer II is connected to the low-voltage side of the No. 2 main transformer. The low-voltage side of the station service transformer II is connected to the working section busbar II via the first busbar section III and the station service transformer V in sequence.

[0011] A connecting circuit breaker is also installed between busbar section I and busbar section II of the working section;

[0012] It also includes a working section busbar section III, on which access line I and access line II are connected in parallel. Access line I is equipped with station service transformer VI, and access line II is equipped with station service transformer VII. Access line I is connected to the first busbar section I, and access line II is connected to the first busbar section III. A dual-power automatic transfer switch is provided between access line II and access line I.

[0013] Furthermore, both station service transformer I and station service transformer II are 110 / 10 kV transformers.

[0014] Furthermore, the station service transformers III, V, VI, and VII are all 10kV / 380V transformers.

[0015] Furthermore, the backup power station is converted to a 35 / 10 kV transformer.

[0016] Furthermore, it also includes working section busbar section IV and working section busbar section V. Working section busbar section IV is connected to the first busbar section I via station service transformer VIII, and working section busbar section V is connected to the first busbar section III via station service transformer IX. A tie circuit breaker is also provided between working section busbar section IV and working section busbar section V.

[0017] The beneficial effects of this utility model are: the station power system of the high-altitude 1000kV substation of this utility model allows the working section bus III section 17 to be powered by any two of the three power supply transformers: station transformer I1, station transformer II3, and backup power station transformer 2. The working section bus III section 17 has multiple power supply guarantees, and the power supply reliability of the working section bus III section 17 is higher, which can better ensure the safety and assembly performance of the main transformer on site. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] The diagram shows: Station service transformer I1, standby power station service transformer 2, station service transformer II 3, first busbar section I 4, first busbar section II 5, first busbar section III 6, tie circuit breaker 7, station service transformer III 8, working section busbar section I 9, station service transformer V 10, working section busbar section II 11, access line I 12, access line II 13, station service transformer VI 14, station service transformer VII 15, dual power automatic transfer switch 16, working section busbar section III 17, working section busbar section IV 18, working section busbar section V 19, station service transformer VIII 20, station service transformer IX 21. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, the high-altitude 1000kV substation power supply system of this utility model includes substation transformer I1, substation transformer II3, backup power substation transformer 2, first busbar section I 4, first busbar section II 5, and first busbar section III 6. The backup power substation transformer 2 is connected from outside the substation, and its low-voltage side is connected to the first busbar section II 5. A tie circuit breaker 7 is provided between the first busbar section II 5 and the first busbar section I 4, and between the first busbar section II 5 and the first busbar section III 6. Substation transformer I1 is connected to the low-voltage side of main transformer No. 1, and its low-voltage side is connected to the working section busbar section I 9 via the first busbar section I 4 and substation transformer III 8. Substation transformer II3 is connected to the low-voltage side of main transformer No. 2, and its low-voltage side is connected to the working section busbar section II 11 via the first busbar section III 6 and substation transformer V 10. A connecting circuit breaker 7 is also installed between busbar section I (9) and busbar section II (11). The system also includes busbar section III (17), on which parallel access lines I (12) and II (13) are installed. Station service transformer VI (14) is installed on access line I (12). Station service transformer VII (15) is installed on access line II (13). Access line I (12) is connected to first busbar section I (4), and access line II (13) is connected to first busbar section III (6). A dual-power automatic transfer switch 16 is installed between access line II (13) and access line I (12).

[0022] This utility model relates to a 1000kV substation power supply system at high altitude, comprising a first busbar section I (4), a first busbar section II (5), and a first busbar section III (6). First busbar section I (4) is connected to the low-voltage side of substation transformer I1; first busbar section II is connected to the low-voltage side of backup power substation transformer 2; and first busbar section III (6) is connected to the low-voltage side of substation transformer II3. Connecting circuit breakers 7 are respectively installed between first busbar section II (5) and first busbar section I (4), and between first busbar section II (5) and first busbar section III (6). Parallel access lines I12 and... are installed on the working section busbar section III (17). Access line II13 connects to access line I12, which is connected to the first busbar I section 4. Access line II13 connects to the first busbar III section 6. A dual-power automatic transfer switch 16 is installed between access line II13 and access line I12. This allows the working section busbar III section 17 to be powered by any two of the three power sources: station transformer I1, station transformer II3, and backup power station transformer 2. The working section busbar III section 17 has multiple power supply guarantees, resulting in higher power reliability and better ensuring the on-site assembly of the main transformer. When a power supply line of the working section busbar III section 17 experiences a fault, the dual-power automatic transfer switch 16 can automatically switch to the other power supply line to ensure uninterrupted power supply to the working section busbar III section 17.

[0023] Specifically, under normal operation, station service transformer I1 and station service transformer II3 serve as dual power sources for supplying power to the working section busbar III section 17. When station service transformer I1 fails, the tie circuit breaker 7 between the first busbar II section 5 and the first busbar I section 4 closes, and the backup power station service transformer 2 is connected to the first busbar I section 4. At this time, the backup power station service transformer 2 and station service transformer II3 serve as dual power sources for supplying power to the working section busbar III section 17. If station service transformer II3 fails, the tie circuit breaker 7 between the first busbar II section 5 and the first busbar III section 6 closes, and the backup power station service transformer 2 is connected to the first busbar III section 6. At this time, the backup power station service transformer 2 and station service transformer I1 serve as dual power sources for supplying power to the working section busbar III section 17.

[0024] To meet the power distribution needs of construction, this utility model can also increase the number of busbar segments in the working section as needed. For example... Figure 1 As shown, this utility model also includes a working section busbar section IV 18 and a working section busbar section V 19. The working section busbar section IV 18 is connected to the first busbar section I 4 via station service transformer VIII 20, and the working section busbar section V 19 is connected to the first busbar section III 6 via station service transformer IX 21. A connecting circuit breaker 7 is also provided between the working section busbar section IV 18 and the working section busbar section V 19.

[0025] Substation transformers I1 and II3 can be 110 / 38 kV transformers or other types of transformers. In this invention, both substation transformers I1 and II3 are 110 / 10 kV transformers, and the backup power substation transformer 2 is a 35 / 10 kV transformer. When both substation transformers I1 and II3 are 110 / 10 kV transformers, and the backup power substation transformer 2 is a 35 / 10 kV transformer, it can be understood that the first busbar section I 4, first busbar section II 5, and first busbar section III 6 should be 10 kV busbars. The operating busbar voltage is generally 380 V; therefore, substation transformers III 8, V10, VI 14, VII 15, VIII 20, and IX 21 in this invention are all 10 kV / 380 V transformers. When station service transformers Ⅲ8, Ⅴ10, Ⅵ14, Ⅶ15, Ⅷ20 and Ⅸ21 are all 10kV / 380V transformers, it is understandable that the busbars of each working section should be 380V working busbars.

Claims

1. A 1000kV substation power supply system at high altitude, characterized in that: It includes station service transformer I (1), station service transformer II (3), backup power station service transformer (2), first busbar section I (4), first busbar section II (5) and first busbar section III (6); The backup power station transformer (2) is connected from outside the station, and its low-voltage side is connected to the first busbar section II (5); A connecting circuit breaker (7) is provided between the first busbar section II (5) and the first busbar section I (4) and between the first busbar section II (5) and the first busbar section III (6); The station service transformer I (1) is connected to the low-voltage side of the No. 1 main transformer. The low-voltage side of the station service transformer I (1) is connected to the working section busbar I (9) in sequence via the first busbar I section (4) and the station service transformer III (8). The station service transformer II (3) is connected to the low-voltage side of the No. 2 main transformer. The low-voltage side of the station service transformer II (3) is connected to the working section busbar II (11) via the first busbar III (6) and the station service transformer V (10) in sequence. A connecting circuit breaker (7) is also installed between busbar section I (9) and busbar section II (11) of the working section; It also includes a working section busbar section III (17), on which a parallel access line I (12) and an access line II (13) are provided. A station service transformer VI (14) is provided on the access line I (12), and a station service transformer VII (15) is provided on the access line II (13). The access line I (12) is connected to the first busbar section I (4), and the access line II (13) is connected to the first busbar section III (6). A dual-power automatic transfer switch (16) is provided between the access line II (13) and the access line I (12).

2. The high-altitude 1000kV substation power supply system as described in claim 1, characterized in that: Both the station service transformer I (1) and the station service transformer II (3) are 110 / 10 kV transformers.

3. The high-altitude 1000kV substation power supply system as described in claim 2, characterized in that: The station service transformers III (8), V (10), VI (14), and VII (15) are all 10kV / 380V transformers.

4. The high-altitude 1000kV substation power supply system as described in claim 1, characterized in that: The backup power station transformer (2) is a 35 / 10 kV transformer.

5. The high-altitude 1000kV substation power supply system as described in claim 1, characterized in that: It also includes working section busbar section IV (18) and working section busbar section V (19). The working section busbar section IV (18) is connected to the first busbar section I (4) via station service transformer VIII (20). The working section busbar section V (19) is connected to the first busbar section III (6) via station service transformer IX (21). A connecting circuit breaker (7) is also provided between the working section busbar section IV (18) and the working section busbar section V (19).

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