Large-capacity on-load multistage wide-range capacity adjusting reactor structure

Abstract

The utility model relates to a large-capacity on-load multistage wide-range capacity-adjusting reactor structure, which aims at an on-load capacity-adjusting reactor with double coarse adjustment and double fine adjustment, an A-phase coil group is connected with a first on-load tap-changer through an A-phase wiring group, and a B-phase coil group is connected with a second on-load tap-changer through a B-phase wiring group. The first on-load tap-changer and the second on-load tap-changer are arranged at one end of the oil tank, the third on-load tap-changer is arranged at the other end of the oil tank, and the A-phase wiring group and the C-phase wiring group are arranged on the high-voltage side of the oil tank and extend towards the two sides respectively. And the B-phase connecting wire group is independently arranged on the low-voltage side of the oil tank, so that the connecting wires of each group cannot be crossed, the size change of the oil tank is small, extra cost cannot be generated, the requirement for adjusting the capacity of the 500kV-grade ultrahigh-voltage on-load capacity-adjusting reactor within the wide range of 30%-100% can be met, and the performance and the quality of a final product are ensured.

Description

Technical Field

[0001] This utility model relates to the field of reactors, specifically a structure for a large-capacity, on-load, multi-stage, wide-range adjustable-capacity reactor. Background Technology

[0002] Maintaining voltage stability and reactive power compensation balance in AC transmission lines is very important. Shunt reactors are often used to compensate for reactive power in the line, but traditional on-load tap changer reactors have problems such as low capacity and small adjustment range.

[0003] With technological advancements, some large-capacity on-load tap changers have emerged in existing technologies. For example, patent CN213877778U discloses a parallel reactor, which includes three coil groups and a three-phase on-load tap changer. The coil groups include fine-tuning coils, coarse-tuning coils, and a main coil. By switching the tap position of the three-phase on-load tap changer to change the number of turns connected to the coils, the reactance value and reactive power compensation capacity of the reactor can be adjusted. Patent CN116779301A discloses an ultra-high voltage wide-range on-load tap changer adjustment structure, which includes a main coil, a first coarse-tuning coil, a first fine-tuning coil, a second coarse-tuning coil, a second fine-tuning coil, and an on-load tap changer group. This structure adopts a dual coarse-tuning and dual fine-tuning adjustment method to meet the adjustment requirements of 500kV ultra-high voltage on-load tap changers within a wide capacity range of 30% to 100%.

[0004] However, in actual production, it has been found that in existing technologies, when conventional transformers or reactors have three single-phase switches, the three switches are generally arranged either along the long axis of the tank or along the short axis of the tank. For example, the on-load tap changer in the aforementioned patent CN213877778U is arranged along the long axis of the tank. However, for the product in the aforementioned patent CN116779301A, the voltage of the switches and tap leads reaches 220kV. If the three switches are placed side by side on the long axis, the width of the tank increases significantly to meet the insulation distance requirements between the switches and the tank, between the switches and the non-phase coils, and between the leads and the non-phase coils. This increases the transport width of the product and the weight of the steel plates and oil, resulting in a significant increase in product cost. If the three single-phase switches are arranged on the short axis at the same time, there will be multiple voltage regulating leads passing through the non-phase coils inside the tank, crossovers of the non-phase voltage regulating leads, and difficulty in controlling the insulation distance between non-phase coils. This increases the safety risks of the product. Utility Model Content

[0005] The purpose of this utility model is to provide a structure for a large-capacity on-load multi-stage wide-range adjustable capacity reactor. It is designed for on-load adjustable capacity reactors that adopt a dual coarse adjustment and dual fine adjustment method. Three on-load tap changers are respectively located at both ends of the oil tank. The A and C connecting wire groups are arranged on the high-voltage side of the oil tank and extend to both sides respectively, while the B connecting wire group is arranged separately on the low-voltage side of the oil tank. In this way, the connections of each group will not cross, and the overall size of the oil tank will also change little, without incurring additional costs.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A high-capacity, on-load, multi-stage, wide-range adjustable-capacity reactor structure includes a yoke housed within an oil tank. The yoke has an A-phase core, a B-phase core, and a C-phase core. An A-phase coil group is mounted on the A-phase core, a B-phase coil group on the B-phase core, and a C-phase coil group on the C-phase core. The A-phase, B-phase, and C-phase coil groups have identical structures, each including a main coil, a coarse adjustment coil group, and a fine adjustment coil group arranged sequentially from the inside out. The coarse adjustment coil group includes a first coarse adjustment coil and a second coarse adjustment coil arranged vertically. The fine-tuning coil group includes a first fine-tuning coil and a second fine-tuning coil arranged vertically. The A-phase coil group is connected to the first on-load tap changer via the A connecting wire group. The B-phase coil group is connected to the second on-load tap changer via the B connecting wire group. The C-phase coil group is connected to the third on-load tap changer via the C connecting wire group. The first and second on-load tap changers are located at one end of the oil tank, and the third on-load tap changer is located at the other end of the oil tank. The A connecting wire group and the C connecting wire group are arranged on the high-voltage side of the oil tank, and the B connecting wire group is arranged on the low-voltage side of the oil tank.

[0008] The A-connector group includes a first A-connector and a second A-connector. The first fine-tuning coil in the A-phase coil group is connected to the upper terminal of the first on-load tap changer via the first A-connector, and the second fine-tuning coil in the A-phase coil group is connected to the lower terminal of the first on-load tap changer via the second A-connector.

[0009] The B-connector group includes a first B-connector and a second B-connector. The first fine-tuning coil in the B-phase coil group is connected to the upper terminal of the second on-load tap changer via the first B-connector, and the second fine-tuning coil in the B-phase coil group is connected to the lower terminal of the second on-load tap changer via the second B-connector.

[0010] The C-connector group includes a first C-connector and a second C-connector. The first fine-tuning coil in the C-phase coil group is connected to the upper terminal of the third on-load tap changer via the first C-connector, and the second fine-tuning coil in the C-phase coil group is connected to the lower terminal of the third on-load tap changer via the second C-connector.

[0011] The oil tank is equipped with a first on-load tap changer and a second on-load tap changer, one end of which is equipped with an AB phase control mechanism housing. The oil tank is also equipped with a third on-load tap changer, one end of which is equipped with a C phase control mechanism housing.

[0012] The first on-load tap changer, the second on-load tap changer, and the third on-load tap changer are all equipped with a tap position monitoring relay.

[0013] The advantages and positive effects of this utility model are as follows:

[0014] 1. This utility model is for an on-load tap changer that adopts a dual coarse and dual fine adjustment method. The first and second on-load tap changers are located at one end of the tank (short shaft side), and the third on-load tap changer is located at the other end of the tank (short shaft side). In this way, the A and C connecting wire groups are arranged on the high-voltage side of the tank and extend to both sides respectively, while the B connecting wire group is arranged separately on the low-voltage side of the tank. The connecting wires of each group will not cross, and the overall size of the tank will also change little, without incurring additional costs.

[0015] 2. Each phase coil group of this utility model adopts a dual coarse and dual fine adjustment method including a main coil, a first coarse adjustment coil, a second coarse adjustment coil, a first fine adjustment coil, and a second fine adjustment coil. This can meet the adjustment requirements of 500kV-level ultra-high voltage on-load tap changer reactors within a wide range of 30% to 100% capacity. Combined with the above-mentioned layout design of the on-load tap changer and each connected line group, the performance and quality of the final product can be guaranteed. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention.

[0017] Figure 2 This is a top view of the present invention.

[0018] Figure 3 This is a schematic diagram showing the connection between the A-phase coil group and the C-phase coil group of this utility model and the corresponding on-load tap changer.

[0019] Figure 4 This is a schematic diagram showing the connection between the B-phase coil group and the corresponding on-load tap changer of this utility model.

[0020] Figure 5 This is a top view showing the connection layout of each phase coil group with its corresponding on-load tap changer in this utility model.

[0021] Figure 6 This is a schematic diagram of the A-phase coil group structure of this utility model.

[0022] Figure 7 This is a schematic diagram showing the connection relationship of each phase coil group of this utility model.

[0023] Among them, 101 is the first on-load tap changer, 102 is the second on-load tap changer, 103 is the third on-load tap changer, 2 is the main coil, 301 is the first coarse adjustment coil, 302 is the first fine adjustment coil, 303 is the second coarse adjustment coil, 304 is the second fine adjustment coil, 4 is the A-connection line group, 401 is the first A-connection line, 402 is the second A-connection line, 5 is the yoke, 501 is the A-phase core, 502 is the B-phase core, 503 is the C-phase core, 6 is the C-connection line group, 601 is the first C-connection line, 602 is the second C-connection line, 701 is the AB-phase control mechanism housing, 702 is the C-phase control mechanism housing, 8 is the gear position monitoring relay, 9 is the B-connection line group, 901 is the first B-connection line, 902 is the second B-connection line. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings.

[0025] like Figures 1-7 As shown, this utility model includes a yoke 5 disposed inside the oil tank, and the yoke 5 is provided with an A-phase iron core 501, a B-phase iron core 502, and a C-phase iron core 503, wherein an A-phase coil group is sleeved on the A-phase iron core 501, a B-phase coil group is sleeved on the B-phase iron core 502, and a C-phase coil group is sleeved on the C-phase iron core 503. Figure 6 As shown, the A-phase coil group, B-phase coil group, and C-phase coil group have the same structure, each including a main coil 2, a coarse adjustment coil group, and a fine adjustment coil group arranged sequentially from the inside out. The coarse adjustment coil group includes a first coarse adjustment coil 301 and a second coarse adjustment coil 303 arranged vertically, and the fine adjustment coil group includes a first fine adjustment coil 302 and a second fine adjustment coil 304 arranged vertically. The structure and wiring relationships of the above coil groups are as follows: Figure 7 As shown, the single-phase coil structure and connection relationship are the same as the coil group in patent CN116779301A.

[0026] like Figures 3-5As shown, the A-phase coil group is connected to the first on-load tap changer 101 via the A connecting wire group 4, the B-phase coil group is connected to the second on-load tap changer 102 via the B connecting wire group 9, and the C-phase coil group is connected to the third on-load tap changer 103 via the C connecting wire group 6. The first on-load tap changer 101 and the second on-load tap changer 102 are located at one end of the oil tank, and the third on-load tap changer 103 is located at the other end of the oil tank. The A connecting wire group 4 and the C connecting wire group 6 are arranged on the high-voltage side of the oil tank, and the B connecting wire group 9 is arranged on the low-voltage side of the oil tank. The A connecting wire group 4 and the C connecting wire group 6 are routed to the left and right respectively and do not cross each other. The B connecting wire group 9 is arranged alone on the low-voltage side and does not cross the other two connecting wire groups. In addition to avoiding wire crossing, this utility model can also meet the insulation distance requirements from the switch to the oil tank, the switch to the non-phase coil, and the lead wire to the non-phase coil through the above structural layout. At the same time, the size of the oil tank changes little and does not increase the product cost. In addition, the potential difference of the first coarse adjustment coil 301, the second coarse adjustment coil 303, the first fine adjustment coil 302, and the second fine adjustment coil 302 in the same phase must be calculated during wiring to ensure sufficient insulation distance.

[0027] like Figures 3-5 As shown, the A-connecting line group 4 includes a first A-connecting line 401 and a second A-connecting line 402. The first fine-tuning coil 302 in the A-phase coil group is connected to the upper terminal of the first on-load tap changer 101 through the first A-connecting line 401, and the second fine-tuning coil 304 in the A-phase coil group is connected to the lower terminal of the first on-load tap changer 101 through the second A-connecting line 402.

[0028] like Figures 3-5 As shown, the B-connector group 9 includes a first B-connector 901 and a second B-connector 902. The first fine-tuning coil 302 in the B-phase coil group is connected to the upper terminal of the second on-load tap changer 102 through the first B-connector 901, and the second fine-tuning coil 304 in the B-phase coil group is connected to the lower terminal of the second on-load tap changer 102 through the second B-connector 902.

[0029] like Figures 3-5 As shown, the C-connector group 6 includes a first C-connector 601 and a second C-connector 602. The first fine-tuning coil 302 in the C-phase coil group is connected to the upper terminal of the third on-load tap changer 103 through the first C-connector 601, and the second fine-tuning coil 304 in the C-phase coil group is connected to the lower terminal of the third on-load tap changer 103 through the second C-connector 602.

[0030] The structure and operating principle of each on-load tap changer are the same as those of the on-load tap changer in patent CN116779301A.

[0031] like Figures 1-2 As shown, the oil tank has a first on-load tap changer 101 and a second on-load tap changer 102, one end of which is equipped with an AB phase control mechanism housing 701. The first on-load tap changer 101 and the second on-load tap changer 102 are controlled by corresponding phase control mechanisms within the AB phase control mechanism housing 701. The oil tank has a third on-load tap changer 103, one end of which is equipped with a C phase control mechanism housing 702. The third on-load tap changer 103 is controlled by phase control mechanisms within the C phase control mechanism housing 702. The phase control mechanism is a supporting device for the on-load tap changer, which is a known technology in the field. This utility model only redesigns the installation position of the phase control mechanism according to the overall product layout to ensure that the control lead does not cross with other lines.

[0032] like Figures 1-2 As shown, the first on-load tap changer 101, the second on-load tap changer 102 and the third on-load tap changer 103 are all equipped with a gear position monitoring relay 8, which is a well-known technology in the field and a commercially available product.

[0033] The working principle of this utility model is as follows:

[0034] This utility model is a further design based on patent CN116779301A. Each phase coil group of this utility model includes a main coil 2, a first coarse adjustment coil 301, a second coarse adjustment coil 303, a first fine adjustment coil 302, and a second fine adjustment coil 304. It adopts a dual coarse and dual fine adjustment method to meet the adjustment requirements of a 500kV ultra-high voltage on-load tap changer reactor within a wide capacity range of 30% to 100%. However, at the same time, the voltage of each on-load tap changer and tap connection line also reaches the 220kV level. If three on-load tap changers are placed side by side on the long axis of the oil tank, the width of the oil tank needs to be increased significantly to meet the insulation distance requirements between the switch and the oil tank, between the switch and the non-phase coil, and between the lead wire and the non-phase coil. This increases the transport width of the product and the weight of the steel plate and oil, resulting in a significant increase in product cost. If three single-phase switches are arranged on the short axis, there will be multiple instances of voltage regulating leads passing through the non-phase coil inside the oil tank, crossover of non-phase voltage regulating leads, and difficulty in controlling the insulation distance between non-phase coils. These issues increase the safety risks of the product.

[0035] like Figure 5As shown, this utility model addresses the aforementioned problems by modifying the layout of the on-load tap changer. Firstly, the first and second on-load tap changers 101 and 102 are located at one end of the oil tank (short shaft side), and the third on-load tap changer 103 is located at the other end of the oil tank (short shaft side). Secondly, the A-phase coil group is connected to the first on-load tap changer 101 via the A connecting wire group 4, and the B-phase coil group is connected to the second on-load tap changer 102 via the B connecting wire group 9. The C-phase coil group is connected to... The C-connecting wire group 6 is connected to the third on-load tap changer 103. The A-connecting wire group 4 and the C-connecting wire group 6 are arranged on the high-voltage side of the oil tank, and the B-connecting wire group 9 is arranged on the low-voltage side of the oil tank. The A-connecting wire group 4 and the C-connecting wire group 6 are wired to the left and right respectively and do not cross each other. The B-connecting wire group 9 is arranged separately on the low-voltage side and does not cross the other two connecting wire groups. This can avoid wire crossing and meet the insulation distance requirements of the product. At the same time, the change in the size of the oil tank is small and will not increase the product cost.

Claims

1. A structure for a large-capacity on-load multi-stage wide-range adjustable reactor, comprising a yoke disposed within an oil tank, wherein an A-phase core, a B-phase core, and a C-phase core are disposed on the yoke; an A-phase coil group is mounted on the A-phase core; a B-phase coil group is mounted on the B-phase core; and a C-phase coil group is mounted on the C-phase core. The A-phase, B-phase, and C-phase coil groups have identical structures, each comprising a main coil, a coarse adjustment coil group, and a fine adjustment coil group arranged sequentially from the inside out. The coarse adjustment coil group includes a first coarse adjustment coil and a second coarse adjustment coil arranged vertically, and the fine adjustment coil group includes a first fine adjustment coil and a second fine adjustment coil arranged vertically. The structure is characterized by: Phase A coil group is connected to the first on-load tap changer (101) via A connecting line group (4), Phase B coil group is connected to the second on-load tap changer (102) via B connecting line group (9), and Phase C coil group is connected to the third on-load tap changer (103) via C connecting line group (6). The first on-load tap changer (101) and the second on-load tap changer (102) are located at one end of the oil tank, and the third on-load tap changer (103) is located at the other end of the oil tank. A connecting line group (4) and C connecting line group (6) are arranged on the high-voltage side of the oil tank, and B connecting line group (9) is arranged on the low-voltage side of the oil tank.

2. The large-capacity on-load multi-stage wide-range adjustable-capacity reactor structure according to claim 1, characterized in that: The A-connector group (4) includes a first A-connector (401) and a second A-connector (402). The first fine-tuning coil (302) in the A-phase coil group is connected to the upper terminal of the first on-load tap changer (101) through the first A-connector (401), and the second fine-tuning coil (304) in the A-phase coil group is connected to the lower terminal of the first on-load tap changer (101) through the second A-connector (402).

3. The large-capacity on-load multi-stage wide-range adjustable-capacity reactor structure according to claim 1, characterized in that: The B-connector group (9) includes a first B-connector (901) and a second B-connector (902). The first fine-tuning coil (302) in the B-phase coil group is connected to the upper terminal of the second on-load tap changer (102) through the first B-connector (901), and the second fine-tuning coil (304) in the B-phase coil group is connected to the lower terminal of the second on-load tap changer (102) through the second B-connector (902).

4. The large-capacity on-load multi-stage wide-range adjustable-capacity reactor structure according to claim 1, characterized in that: The C-connector group (6) includes a first C-connector (601) and a second C-connector (602). The first fine-tuning coil (302) in the C-phase coil group is connected to the upper terminal of the third on-load tap changer (103) through the first C-connector (601), and the second fine-tuning coil (304) in the C-phase coil group is connected to the lower terminal of the third on-load tap changer (103) through the second C-connector (602).

5. The large-capacity on-load multi-stage wide-range adjustable-capacity reactor structure according to claim 1, characterized in that: The oil tank is provided with a first on-load tap changer (101) and a second on-load tap changer (102) at one end, and an AB phase control mechanism housing (701) is provided at one end of the oil tank, which is provided with a third on-load tap changer (103).

6. The large-capacity on-load multi-stage wide-range adjustable-capacity reactor structure according to claim 1, characterized in that: The first on-load tap changer (101), the second on-load tap changer (102) and the third on-load tap changer (103) are all equipped with a gear position monitoring relay (8).

Images