CN202384159U - Traction transformer in Scott connexion - Google Patents

Abstract

A Scott-connected traction transformer relates to a traction transformer. The outlet voltage of the secondary side of the traditional Scott transformer is 55kV, and an outlet autotransformer of 55/27.5kV is required, which is costly; occupies a large area; consumes a lot of power, and the equipment layout of the traction substation is complicated, and the operation and maintenance costs are high . The utility model is characterized in that: the first main column, the second main column, the third main column and the fourth main column are connected with three concentric winding layers from inside to outside, wherein the first winding of the first main column and the second main column The outer layer of the power supply side winding is the feed side winding, and the outer layer of the feed side is the power supply side winding; the first winding layer of the third main column is The power supply side winding, the second winding layer is the feed side winding; the first winding layer of the fourth main column is the feed side winding, and the second winding layer is the power supply side winding. The utility model has a simple structure, meets design requirements, and reduces design and production costs.

Description

A Traction Transformer with Scott Connection

technical field

The utility model relates to a traction transformer.

Background technique

At present, the traction transformers commonly used in our country for AT power supply include the traditional Scott connection traction transformer and VX connection traction transformer. The output voltage of the secondary side of the traditional Scott transformer is 55kV, and the outlet autotransformer 55kV is required for power transformation. /27.5kV, high equipment and engineering costs; large area, high cost of land acquisition and demolition; large power loss, complex equipment layout of traction substation, high operation and maintenance costs. Although the VX connection traction transformer can reduce the investment, it cannot guarantee the symmetry of the three-phase current on the primary side, and has a great impact on the negative sequence generated by the power system.

Utility model content

The technical problem to be solved and the technical task proposed by the utility model are to improve and improve the existing technical solutions, and to provide a Scott-connected traction transformer, so as to meet the design requirements and achieve the purpose of simple structure and low cost. For this reason, the utility model takes the following technical solutions.

A traction transformer connected by Scott, comprising two single-phase transformers of M transformer and T transformer, characterized in that: the M transformer single-phase transformer is provided with the first main column and the second main column, and the T transformer single-phase transformer is provided with the third The main column and the fourth main column, the first main column, the second main column, the third main column and the fourth main column are connected with three concentric winding layers from the inside to the outside, which are respectively the first winding layer and the second winding layer. layer and the third winding layer, the third winding layer is the primary side winding; the first winding layer and the second winding layer of the first main column and the second main column are divided into two parts, and the first winding layer includes the power supply side The first equalized winding and the second equally divided winding on the feeder side, the second winding layer includes the second equally divided winding on the power supply side and the first equally divided winding on the feeder side, the outer layer of the first equally divided winding on the power supply side is the feeder side The first equal winding on the power supply side, the outer layer of the second equal winding on the feed side is the second equal winding on the power supply side; the first equal winding on the power supply side on the same main column is connected in series with the second equal winding on the power supply side, and the same main column The first equalized winding on the feeder side and the second equalized winding on the feeder side are connected in series, and the power supply side windings on the first and second main columns connected in series are connected in parallel to form the second output terminal and ground terminal on the power supply side of the transformer. , the feed-side windings on the first and second main columns in series are connected in parallel to form the second output terminal and ground terminal on the feed-in side of the transformer, and the primary-side windings on the first and second main columns are connected to form a C-phase input terminal and B-phase input terminal; the first winding layer of the third main column is the third winding on the power supply side, and the second winding layer is the third winding on the feeding side; the first winding layer of the fourth main column is the fourth winding on the feeding side winding, the second winding layer is the fourth winding on the power supply side, the third winding on the power supply side and the fourth winding on the power supply side are connected in series to form the first output terminal and the ground terminal on the The windings are connected in series to form the first output terminal and ground terminal on the power supply side, and the primary side windings on the third and fourth main columns are connected in series to form the A-phase input terminal and the primary winding connection point on the first and second main columns. Three-phase midpoint S. The grounding terminal of the power supply side winding and the grounding terminal (output terminal) of the feeding side winding are located at the upper and lower ends of the winding respectively, which facilitates the insulation between the two low-voltage winding layers. The input terminals of A, B, and C phases and the input transformer Three-phase electrical connection.

As a further improvement and supplement to the above technical solution, the utility model also includes the following additional technical features.

The first winding layer and the second winding layer of the first main column and the second main column are divided into upper and lower parts, in which the upper half of the first winding layer is the first equal winding of the power supply side, and the lower half is the feeder The second equal winding on the side; the upper half of the second winding layer is the first equal winding on the feed side, and the lower half is the second equal winding on the power supply side.

The end of the first equalized winding on the power supply side on the same main column is connected to the head end of the second equalized winding on the power supply side, and the end of the first equalized winding on the feeder side is connected to the head end of the second equalized winding on the feeder side; The first end of the first equalized winding on the power supply side on one main column is connected to the first end of the first equalized winding on the power supply side on the second main column, and this connection end is the second output end on the power supply side; The first end of the first equalized winding on the feeder side is connected to the first end of the first equalized winding on the feeder side on the second main column, which is the ground terminal N on the feeder side; the power supply on the first main column The end of the second equalized winding on the power supply side is connected to the end of the second equalized winding on the power supply side on the second main column, which is the ground terminal N on the power supply side; the second equalized winding on the feeder side on the first main column The end of the second main column is connected to the end of the second equal winding on the feeder side, which is the second output terminal on the feeder side; the first end of the primary side winding on the first main column is the C-phase input terminal, The first end of the primary side winding on the second main column is the B-phase input terminal, the ends of the primary side winding on the first and second main columns are connected, and the connection end is connected to the three-phase midpoint S; the end of the third winding on the power supply side It is connected to the end of the fourth winding on the power supply side, the first end of the third winding on the power supply side is the ground terminal, the first end of the fourth winding on the power supply side is the first output end on the power supply side, and the end of the third winding on the power supply side is connected to the The end of the fourth winding is connected, the first end of the third winding on the feeder side is the first output end on the feeder side, and the first end of the fourth winding on the feeder side is the ground end; the end of the primary winding on the third main column is connected to the first The ends of the primary side windings on the four main columns are connected, the first end of the primary side winding on the fourth main column is the input end of phase A, the first end of the primary side winding (H _c ) on the third main column is connected to the first main column and the second main column The ends of the primary side windings on the two main columns are connected.

The first winding layer and the second winding layer of the first main column and the second main column are divided into upper and lower parts, wherein the upper half of the first winding layer is the second equal winding on the feed side, and the lower half is the power supply The first equalized winding on the power supply side; the upper half of the second winding layer is the second equalized winding on the power supply side, and the lower half is the first equalized winding on the feeder side.

The first and second main columns and the third and fourth main columns are respectively arranged in two single-phase traction transformers, and the two single-phase traction transformers share an oil tank. Two transformers with two main columns have a common oil tank, and are directly connected to wires inside. One such transformer can be used in one substation, which saves costs and reduces the occupied area.

Beneficial effects: (1) The three-phase current on the primary side can be guaranteed to be symmetrical, and the power supply to the catenary can realize bilateral power supply; (2) The middle point of the secondary side can satisfy Z ₂₁ =Z ₃₁ , and (3Z ₂₁ +Z ₃₁ -Z _{23- 1} )/4<0.45Ω impedance requirement, no need to install autotransformer at the outlet of the substation, suitable for high-speed and heavy-duty railways with AT power supply mode of 110kV and 220kV voltage levels, where the distance of the power supply arm is long, the traction current is large, It has a greater advantage when the traffic density is high and the probability that both arms are loaded at the same time is high. (3) The two single-phase transformers of the T transformer and the M transformer share the same oil tank, and are directly connected to the TX wiring inside. One such transformer can be used in one substation, which saves costs and reduces the occupied area.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The technical solution of the utility model is described in further detail below in conjunction with the accompanying drawings of the description.

Embodiment 1: As shown in Figure 1, the utility model comprises M to change and T to change two single-phase transformers, the M variable single-phase transformer is provided with the first main column 1, the second main column 2, and the T variable single-phase transformer is provided with the first The three main columns 3 and the fourth main column 4, the first main column 1, the second main column 2, the third main column 3 and the fourth main column 4 are connected with three concentric winding layers from inside to outside, respectively. The first winding layer, the second winding layer and the third winding layer, the third winding layer is the primary side winding H _a , H _x , H _c , H _z ; where the first main column 1 and the second main column 2 cover the first The first winding layer and the second winding layer are divided into two parts. The first winding layer includes the first equalized winding T _a1 and T _x1 on the power supply side and the second equalized winding F _a2 and F _x2 on the feeding side. The second winding layer includes The second equalized winding T _a2 , T _x2 on the power supply side and the first equalized winding F _a1 , F _x1 on the feeder side, and the outer layer of the first equalized winding T a1 and _{T x1 on} the power supply side is the first equalized winding on the feeder side F _a1 , F _x1 , the outer layers of the second equalized windings F _a2 and F _x2 on the feeder side are the second equalized windings T _a2 and T _x2 on the power supply side; The second equal winding is connected in series, the first equal winding on the feeding side on the same main column is connected in series with the second equal winding on the feeding side, and the windings on the power supply side on the first and second main columns 1 and 2 connected in series are connected in parallel And form the second output terminal _T2 and the grounding terminal N on the power supply side of the transformer, and form the second output terminal F2 and the ground terminal N on the power supply side of the transformer through the parallel connection of the windings on the feeding side of the first and second main columns 1 and ₂ connected in series. The ground terminal N, the primary side windings H _a and H _x on the first and second main columns 1 and 2 are connected to form a C-phase input terminal and a B-phase input terminal; the first winding layer of the third main column 3 is the power supply side The third winding T _c3 , the second winding layer is the third winding F _c3 on the feeding side; the first winding layer of the fourth main column 4 is the fourth winding F _z4 on the feeding side, and the second winding layer is the fourth winding on the feeding side T _z4 , the third winding F _c3 on the feed side and the fourth winding F _z4 on the feed side are connected in series to form the first output terminal F ₁ and the ground terminal on the feed side, the third winding T _c3 on the power supply side and the fourth winding T on the power supply side _z4 is connected in series to form the first output terminal _T1 and the ground terminal N on the power supply side, and the primary side windings _Hc and _Hz on the third and fourth main columns 3 and 4 are connected in series to form the A-phase input terminal and the first and second The three-phase midpoint S where the connection points of the primary side windings H _a , H _x , H _c , and _Hz on the main columns 1 and 2 are connected. The first and second main columns 1 and 2 and the third and fourth main columns 3 and 4 are respectively arranged in two single-phase traction transformers, and the two single-phase traction transformers share an oil tank.

The first winding layer and the second winding layer of the first main column 1 and the second main column 2 are divided into upper and lower parts, and the upper half of the first winding layer is the first equal winding T _a1 and T _x1 of the power supply side , the lower half is the second equal winding F _a2 , F _x2 on the feed side; the upper half of the second winding layer is the first equal winding F _a1 , F _x1 on the feed side, and the lower half is the second equal winding on the power supply side sub-winding T _a2 , T _x2 . The ends of the first equalized windings T _a1 and T _x1 on the power supply side on the same main column 1 and 2 are connected to the first ends of the second equalized windings T _a2 and T _x2 on the power supply side, and the first equalized windings F _a1 and The end of F _x1 is connected to the head end of the second equalized winding F _a2 and F _x2 on the feeder side; the head end of the first equalized winding T _a1 on the power supply side on the first main column 1 is connected to the power supply The head end of the first equalized winding T _x1 on the power supply side is connected to the second output end T ₂ on the power supply side; the head end of the first equalized winding F _a1 on the feeder side on the first main column The first end of the first equalized winding F _x1 on the feeder side on column 2 is connected, which is the ground terminal N on the feeder side; the end of the second equalized winding T _a2 on the first main column 1 is connected to the second The end of the second equalized winding T _x2 on the power supply side on the second main column 2 is connected, and this connection end is the ground terminal N on the power supply side; the end of the second equalized winding F _a2 on the first main column 1 is connected to the second The end of the second equalized winding F _x2 on the feeder side on the second main column 2 is connected, which is the second output terminal F ₂ on the feeder side; the first end of the primary side winding H _a on the first main column 1 is C The first end of the primary side winding H _x on the second main column 2 is the B-phase input terminal, and the ends of the primary side winding H _a and H _x on the first and second main columns 1 and 2 are connected. It is connected to the three-phase midpoint S; the end of the third winding T _c3 on the power supply side is connected to the end of the fourth winding T _z4 on the power supply side, the first end of the third winding T _c3 on the power supply side is the ground terminal, and the fourth winding T _z4 on the power supply side The first end of the feeder side is the first output end T ₁ of the power supply side, the end of the third winding F _c3 on the feeder side is connected to the end of the fourth winding F _z4 on the feeder side, and the head end of the third winding F _c3 on the feeder side is the feeder The first output terminal F ₁ on the feeder side, the first end of the fourth winding F _z4 on the feed side is the ground terminal N; the end of the primary side winding H _c on the third main column 3 is connected to the primary side winding H _z on the fourth main column 4 The ends are connected, the first end of the primary side winding H _z on the fourth main column 4 is the A-phase input end, the first end of the primary side winding H _c on the third main column 3 is connected to the first main column 1 and the second main column 2 The ends of the primary side winding H _a and H _x are connected.

Embodiment 2: The difference from Embodiment 1 is that the first winding layer and the second winding layer of the first main column 1 and the second main column 2 are divided into upper and lower parts, and the upper half of the first winding layer are the second equalized windings F _a2 and F _x2 on the feeder side, the lower part is the first equalized windings T _a1 and T _x1 on the power supply side; the upper half of the second winding layer is the second equalized windings T _{a2 and Tx1} on the power supply side T _x2 , the lower half is the first equalized winding F _a1 and F _x1 on the feeding side.

The input terminals of phase A, B and C of the primary side winding are the input terminals of the three-phase voltage 110kV or 220kV of the transformer; the first output terminal T ₁ and the second output terminal T ₂ of the power supply side are the 27.5kV output terminals of the power supply side of the transformer; The first output terminal _F1 and the second output terminal _F2 on the feeder side are 27.5kV output terminals on the feeder side of the transformer.

Claims (5)

1. the traction transformer of a Scott wiring; Comprise that M becomes and T becomes two single-phase transformers; It is characterized in that: M becomes single-phase transformer and establishes first principal post (1), second principal post (2); T becomes single-phase transformer and establishes the 3rd principal post (3), the 4th principal post (4); Described first principal post (1), second principal post (2), the 3rd principal post (3) and the 4th principal post (4) from-inner-to-outer socket three concentric winding layers are respectively first winding layers, second winding layers and tertiary winding layer, and the 3rd layer of winding layers is first side winding (H _a, H _x, H _c, H _z); Wherein first winding layers and second winding layers of first principal post (1) and second principal post (2) overcoat are divided into two parts, and first winding layers comprises the supply side first (T such as sub-winding such as grade _A1, T _X1) and sub-winding (F such as supply side second _A2, F _X2), second winding layers comprises the supply side second (T such as sub-winding such as grade _A2, T _X2) and sub-winding (F such as supply side first _A1, F _X1), the supply side first (T such as sub-winding such as grade _A1, T _X1) skin is the supply side first (F such as sub-winding such as grade _A1, F _X1), the supply side second (F such as sub-winding such as grade _A2, F _X2) skin is the supply side second (T such as sub-winding such as grade _A2, T _X2); Supply side first sub-winding such as grade on the same principal post and the supply side second five equilibrium windings in series; Supply side first sub-winding such as grade on the same principal post and the supply side second five equilibrium windings in series, the second output (T of supply side winding parallel connection on first, second principal post of series connection and formation transformer-supplied side ₂) and earth terminal (N), the supply side winding parallel connection on first, second principal post (1,2) of series connection forms the second output (F of transformer supply side ₂) and earth terminal (N), the first side winding (H on first, second principal post (1,2) _a, H _x) connect and formation C phase input and B phase input; First winding layers of the 3rd principal post (3) is the supply side tertiary winding (T _C3), second winding layers is the supply side tertiary winding (F _C3); First winding layers of the 4th principal post (4) is supply side the 4th winding (F _Z4), second winding layers is supply side the 4th winding (T _Z4), the supply side tertiary winding (F _C3) and supply side the 4th winding (F _Z4) connecting forms the first output (F of supply side ₁) and earth terminal, the supply side tertiary winding (T _C3) and supply side the 4th winding (T _Z4) connecting forms the first output (T of supply side ₁) and earth terminal (N), the first side winding (H on the 3rd, the 4th principal post (3,4) _c, H _z) series connection form A phase input and with first, second principal post (1,2) on first side winding (H _a, H _x, H _c, H _z) the continuous three-phase mid point (S) of tie point.

2. the traction transformer of a kind of Scott wiring according to claim 1; It is characterized in that: first winding layers of first principal post (1) and second principal post (2) overcoat and second winding layers are divided into two parts up and down, and wherein first winding layers the first half is the supply side first (T such as sub-winding such as grade _A1, T _X1), the latter half is the supply side second (F such as sub-winding such as grade _A2, F _X2); Second winding layers the first half is the supply side first (F such as sub-winding such as grade _A1, F _X1), the latter half is the supply side second (T such as sub-winding such as grade _A2, T _X2).

3. the traction transformer of a kind of Scott wiring according to claim 2 is characterized in that: the sub-winding (T such as supply side first on the same principal post (1,2) _A1, T _X1) sub-winding (T such as end and supply side second _A2, T _X2) the head end connection, the supply side first (F such as sub-winding such as grade _A1, F _X1) sub-winding (F such as end and supply side second _A2, F _X2) the head end connection; The supply side first (T such as sub-winding such as grade on first principal post (1) _A1) head end and the sub-winding (T such as supply side first on second principal post (2) _X1) head end connect, this link is the supply side second output (T ₂); The supply side first (F such as sub-winding such as grade on first principal post (1) _A1) head end and the sub-winding (F such as supply side first on second principal post (2) _X1) head end connect, this link is supply side earth terminal N; The supply side second (T such as sub-winding such as grade on first principal post (1) _A2) end and the sub-winding (T such as supply side second on second principal post (2) _X2) end connect, this link is supply side earth terminal N; The supply side second (F such as sub-winding such as grade on first principal post (1) _A2) end and the sub-winding (F such as supply side second on second principal post (2) _X2) end connect, this link is the supply side second output (F ₂); First side winding (H on first principal post (1) _a) head end is C phase input, the first side winding (H on second principal post (2) _x) head end is B phase input, the first side winding (H on first and second principal post (1,2) _a, H _x) end is connected, this link is connected with three-phase mid point (S); The supply side tertiary winding (T _C3) end and supply side the 4th winding (T _Z4) end connect the supply side tertiary winding (T _C3) head end be earth terminal, supply side the 4th winding (T _Z4) head end be the supply side first output (T ₁), the supply side tertiary winding (F _C3) end and supply side the 4th winding (F _Z4) end connect the supply side tertiary winding (F _C3) head end be the supply side first output (F ₁), supply side the 4th winding (F _Z4) head end be earth terminal (N); First side winding (H on the 3rd principal post (3) _c) first side winding (H on terminal and the 4th principal post (4) _z) terminal connection, the first side winding (H on the 4th principal post (4) _z) head end is A phase input, the first side winding (H on the 3rd principal post (3) _c) first side winding (H on head end and first principal post (1) and second principal post (2) _a, H _x) terminal linking to each other.

4. the traction transformer of a kind of Scott wiring according to claim 1; It is characterized in that: first winding layers of first principal post (1) and second principal post (2) overcoat and second winding layers are divided into two parts up and down, and wherein first winding layers the first half is the supply side second (F such as sub-winding such as grade _A2, F _X2), the latter half is the supply side first (T such as sub-winding such as grade _A1, T _X1); Second winding layers the first half is the supply side second (T such as sub-winding such as grade _A2, T _X2), the latter half is the supply side first (F such as sub-winding such as grade _A1, F _X1).

5. according to the traction transformer of the described a kind of Scott wiring of the arbitrary claim of claim 1-4; It is characterized in that: described first, second principal post (1,2) and the 3rd, the 4th principal post (3,4) are divided in two single-phase traction transformers, and two single-phase traction transformers are fuel tank altogether.

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