A balanced phase arrangement structure of a four-branch balanced bushing transformer

Abstract

The present invention relates to a balanced phase arrangement structure of a four-branch balanced bushing transformer, and belongs to the technical field of transformers. The technical scheme is: the balanced winding connection adopts the d11 connection method, fully utilizing the internal space of the transformer, the balanced winding outlet is placed on the high-voltage side, and the balanced winding outlets Pa, Pb, Pc, and P0 are divided into two groups, Pa and Pb are arranged adjacently as one group, and are placed between the high-voltage phases A and B; Pc and P0 are arranged adjacently as another group, and are placed between the high-voltage phases B and C. The present invention effectively avoids many problems such as interference, adjacency, and crossing between the balanced leads and the low-voltage leads; the balanced bushing is arranged on the high-voltage side, Pa and Pb are arranged adjacently as one group, and Pc and P0 are arranged adjacently as another group, fully utilizing the internal space of the transformer, with a simple structure and reasonable arrangement.

Description

Technical Field

[0001] The invention relates to a balanced phase arrangement structure of a four-branch balanced bushing transformer, belonging to the technical field of transformers. Background Art

[0002] At present, due to the needs of the power grid or users, some transformers need to be connected at low voltage in yn0 mode. In order to balance the zero-sequence current and three Nth harmonics of the transformer, a balanced winding with d connection mode must be inserted. When the transformer is equipped with four balanced bushings, it is difficult to arrange the low-voltage bushings of the existing technology in an equidistant and adjacent manner on the low-voltage side of the transformer. Summary of the invention

[0003] The purpose of the present invention is to provide a balanced phase arrangement structure of a four-branch balanced bushing transformer, which fully utilizes the internal space of the transformer, has a simple structure and a reasonable arrangement, and solves the above-mentioned technical problems existing in the prior art.

[0004] The technical solution of the present invention is:

[0005] A balanced phase arrangement structure of a four-branch balanced bushing transformer, wherein the balanced winding connection adopts the d11 connection method, fully utilizing the internal space of the transformer, the balanced winding outlet is arranged on the high voltage side, and the balanced winding outlets Pa, Pb, Pc, and P0 are divided into two groups, Pa and Pb are arranged adjacent to each other as one group and are placed between high voltage phases A and B; Pc and P0 are arranged adjacent to each other as another group and are placed between high voltage phases B and C.

[0006] The lead connection of the balance winding is connected by the balance winding head, the up-line copper bar, the down-line copper bar, the paper-wrapped cable and the connecting piece, which fully utilizes the internal space of the transformer, has a simple structure and a reasonable layout.

[0007] The beneficial effects of the present invention are as follows: compared with placing the balance lead on the high-voltage side, the present invention effectively avoids many problems such as interference, adjacency, and crossing between the balance lead and the low-voltage lead; the balance bushing is arranged on the high-voltage side, Pa and Pb are arranged adjacently in one group, and Pc and P0 are arranged adjacently in another group, which fully utilizes the internal space of the transformer, has a simple structure, and a reasonable layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the wiring principle of the present invention;

[0009] Figure 2 It is a schematic diagram of the arrangement structure of the present invention;

[0010] Figure 3 is a schematic top view of the up line copper busbar of the present invention;

[0011] Figure 4 This is a schematic top view of the downlink copper busbar of the present invention;

[0012] In the figure: upstream copper bar one 1, paper covered cable one 2, upstream copper bar two 3, paper covered cable two 4, upstream copper bar three 5, paper covered cable three 6, downstream copper bar one 7, downstream copper bar two 8, downstream copper bar three 9, upstream copper bar four 10, and terminal 11. DETAILED DESCRIPTION

[0013] The present invention will be further described below by way of embodiments with reference to the accompanying drawings.

[0014] A balanced phase arrangement structure of a four-branch balanced bushing transformer, wherein the balanced winding connection adopts the d11 connection method, fully utilizing the internal space of the transformer, the balanced winding outlet is arranged on the high voltage side, and the balanced winding outlets Pa, Pb, Pc, and P0 are divided into two groups, Pa and Pb are arranged adjacent to each other as one group and are placed between high voltage phases A and B; Pc and P0 are arranged adjacent to each other as another group and are placed between high voltage phases B and C.

[0015] In the embodiment, the balancing bushing is arranged on the high voltage side, the balancing winding adopts the d11 connection method, and the wiring principle diagram is shown in Figure 1; the arrangement method is shown in Figure 2 (main view), Figure 3 (upstream line copper busbar top view), and Figure 4 (downstream line copper busbar top view).

[0016] Among them: labels 2, 4, and 6 are paper-covered cables connecting the upper and lower copper bars; labels 1, 3, 5, and 10 are the upstream copper bars; labels 7, 8, and 9 are the downstream copper bars; and label 11 is the wiring lug connected to the balancing bushing.

[0017] The upline copper busbar includes upline copper busbar 1, upline copper busbar 2, upline copper busbar 3, upline copper busbar 3, and upline copper busbar 4, 10; the downline copper busbar includes downline copper busbar 1, downline copper busbar 2, 8, and downline copper busbar 3, 9; the paper covered cable includes paper covered cable 1, paper covered cable 2, 4, and paper covered cable 3, 6; and the terminal piece 11.

[0018] In Figure 2: the balanced winding leads Pa, Pb, Pc, and P0 are divided into two groups, Pa and Pb are arranged adjacently in one group and placed between high voltage phases A and B; Pc and P0 are arranged adjacently in another group and placed between high voltage phases B and C. The balanced winding connection adopts the d11 connection method, and the connection method of the balanced lead wire is as follows: the head of the balanced phase a is connected to the end of the balanced phase b through the up line copper bar 1, the paper-wrapped cable 2, and the down line copper bar 7; the head of the balanced phase b is connected to the end of the balanced phase c through the up line copper bar 23, the paper-wrapped cable 24, and the down line copper bar 28; the head of the balanced phase c is connected to the up line copper bar 410; the balanced phase 0 is connected to the end of the balanced phase a through the down line copper bar 39, the paper-wrapped cable 36, and the up line copper bar 35; the up line copper bar 1, the up line copper bar 23, the up line copper bar 35, and the up line copper bar 410 are connected to the balanced bushing through the connecting piece 11.

[0019] Compared with placing the balanced lead on the low-voltage side, the present invention effectively avoids many problems such as interference, adjacency, and crossing between the balanced lead and the low-voltage lead. As shown in Figure 2, the uplink copper bar 1, the uplink copper bar 2, the uplink copper bar 3, the uplink copper bar 3, and the uplink copper bar 4 are all far away from the high-voltage lead, and avoid being adjacent to and crossing the high-voltage A, B, and C lead cables of higher voltage levels. As shown in Figures 3 and 4, the paper-wrapped cable 1, 2, 4, and 3, 6 as the upper and lower connecting lines fully utilize the free space outside the A, B, and C body columns, so that the internal space of the transformer is more fully utilized. The balanced bushing of the present invention is arranged on the high-voltage side, Pa and Pb are arranged adjacently in one group, and Pc and P0 are arranged adjacently in another group, which fully utilizes the internal space of the transformer, has a simple structure, and is reasonably arranged.

Claims

1. A balanced phase arrangement structure of a four-branch balanced bushing transformer, characterized in that: The balance winding connection adopts the d11 connection method to make full use of the internal space of the transformer. The balance winding outlet is placed on the high-voltage side. The balance winding outlets Pa, Pb, Pc, and P0 are divided into two groups. Pa and Pb are arranged adjacent to each other in one group and are placed between high-voltage phases A and B; Pc and P0 are arranged adjacent to each other in another group and are placed between high-voltage phases B and C. The lead connection of the balance winding is connected by the balance winding outlet, the uplink copper bar, the downlink copper bar, the paper-wrapped cable, and the connecting piece. The uplink copper bar includes an uplink copper bar one (1), an uplink copper bar two (3), an uplink copper bar three (5), and an uplink copper bar four (10); the downlink copper bar includes a downlink copper bar one (7), a downlink copper bar two (8), and a downlink copper bar three (9); the paper-wrapped cable includes a paper-wrapped cable one (2), a paper-wrapped cable one (3), a downlink copper bar two (4), and a downlink copper bar three (5). The balanced winding connection adopts the D11 connection method, and the connection method of the balanced lead wire is as follows: the balanced phase A head is connected to the balanced phase B end through the up line copper bar one (1), the paper covered cable one (2), and the down line copper bar one (7); the balanced phase B head is connected to the balanced phase C end through the up line copper bar two (3), the paper covered cable two (4), and the down line copper bar two (8); the balanced phase C head is connected to the up line copper bar four (10); the balanced phase 0 is connected to the balanced phase A end through the down line copper bar three (9), the paper covered cable three (6) and the up line copper bar three (5); the up line copper bar one (1), the up line copper bar two (3), the up line copper bar three (5) and the up line copper bar four (10) are connected to the balanced bushing through the connecting piece (11).

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