CN2874736Y

CN2874736Y - Scott transformer for changing three phase into two phase

Info

Publication number: CN2874736Y
Application number: CN 200620019407
Authority: CN
Inventors: 彭惠; 李亚晶
Original assignee: YUNNAN TRANSFORMER ELECTRIC CO Ltd
Current assignee: Tianwei Yunnan Transformer Co., Ltd.
Priority date: 2006-04-04
Filing date: 2006-04-04
Publication date: 2007-02-28
Anticipated expiration: 2016-04-04

Abstract

The utility model belongs to the technical field of transformers in particular to a three-phase to two-phase Scote transformer to be specific. Tap n1 is arranged in the secondary winding T1 F1 of Transformer M. Tap n2 is arranged in the secondary winding T2 F2 of Transformer T. n1 is connected with n2 to form a neutral point n. In actual use, T1, T2 is connected with a positive feeder of contact grid. F1, F2 is connected with a negative feeder. Neutral point n is connected with steel tracks. Thus, internal AT function can be fulfilled in the main transformer. Transformer T and Transformer M can use separate magnetic circuits or share a common magnetic circuit. The iron core can be two-pole or three-pole type. When Transformer T and Transformer M use separate magnetic circuits, they can share the same one oil conservator, or use their own oil conservators. If separate oil conservators are used, the two oil conservators can be connected with oil pipeline that can be linked or dismantled. Transformer T and Transformer M can be electrically connected with each other through the oil pipeline between the oil conservators. They can also be electrically connected outside the oil conservators. Transformer T and Transformer M has the advantages of uniting Scote transformer A and Transformer T into integrity, running reliability and economy of which are superior to the existing technologies.

Description

A kind of scott transformer for changing three phase into two phase

Affiliated technical field

The utility model belongs to the transformer technology field, is specifically related to the scott transformer for changing three phase into two phase that a kind of traction substation of electric railway that is used for single-circuit transformer (AT) supply power mode uses.

Background technology

Electrifing railway supply is the three phase mains that electric power system is provided, and becomes a two-phase or a phase at traction substation, uses for the traction feeding network.Normally used supply power mode has direct-furnish, direct-furnish to add backflow, BT and AT etc.Wherein the AT supply power mode is specially adapted to high speed, heavy railway because transformer station's supply district is big, load-bearing capacity is strong.In existing AT supply power mode traction substation, generally adopt Scott (Scott) transformer as main transformer.The Scott transformer by the winding of two single-phase transformers, be that M becomes winding and T and becomes winding coupling and form.When this transformer was used for the tractive power supply system of AT supply power mode, secondary side will could connect the traction net through the AT transformer, therefore many AT transformers need be set and be used.

The utility model content

The purpose of this utility model provides a kind of scott transformer for changing three phase into two phase of the AT of being used for supply power mode, it can unite two into one Scott transformer and AT transformer, in main transformer, finish AT transformer function, saving many AT transformers in the station, thereby improve the operational reliability and the economy of electrifing railway supply.

Structure of the present utility model is a (see figure 1): T becomes the end points D of a winding BD and the mid point connection that M becomes a winding AC, it is characterized in that the secondary winding T that M becomes ₁F ₁Be provided with centre tap n ₁, the secondary winding T that T becomes ₂F ₂Be provided with centre tap n ₂, n ₁And n ₂Be joined together to form neutral point n.T during use ₁, T ₂Connect the contact line positive feeder, F ₁, F ₂Connect negative feeder, neutral point n connects rail, has so just finished the function of AT in the station in main transformer, can effectively reduce cost of investment and floor space.T in the utility model becomes and the M change can be an independent magnetic circuit, also can be common magnetic circuit.The iron core that T becomes and M becomes can be twin columns, also can be three posts.T becomes and M when becoming independent magnetic circuit, can a shared fuel tank, also can distinguish each circuit connection with a fuel tank.If T change and M variation are not respectively with a fuel tank, then can also be provided with the oil pipe road that can dock mutually and take apart between two fuel tanks, the oil pipe road that T becomes and the M change can be passed between the fuel tank carries out electrical coupling, also can carry out electrical coupling in the fuel tank outside without the oil pipe road.

The utility model has the advantages that Scott and AT change are united two into one that operational reliability and economy all are better than prior art.

Description of drawings

Fig. 1 is the connection principle schematic diagram of the utility model Scott transformer.

Fig. 2 is the secondary connection principle schematic diagram of embodiment.

Fig. 3 is the winding connection schematic diagram of embodiment.

Embodiment

Embodiment: see Fig. 2 and 3.The 110kV high voltage transmission line becomes two-phase through present embodiment by three-phase, and voltage becomes 2 * 27.5kV by 110kV, can save AT in the station, reduces investment.T becomes and M becomes the common magnetic circuit of employing, and iron core is three posts, and the winding that M becomes and T becomes is distributed in two side columns, and center pillar does not have winding.M becomes secondary winding T ₁F ₁Centre tap and T become secondary winding T ₂F ₂Centre tap be joined together to form earth terminal n.A, B, C are three-phase input end, and the end points D that T becomes a winding BD connects with the mid point that M becomes a winding AC.

Above embodiment is only for the utility model is described in further detail, and scope of the present utility model is not subjected to the limitation of illustrated embodiment.

Claims

1, a kind of scott transformer for changing three phase into two phase, T becomes the end points (D) of a winding (BD) and connects with the mid point that (M) becomes a winding (AC), it is characterized in that the secondary winding (T1F1) that M becomes is provided with centre tap (n1), the secondary winding (T2F2) that T becomes is provided with centre tap (n2), (n1) and (n2) is joined together to form neutral point (n).

2,, it is characterized in that T becomes and M becomes independent magnetic circuit or is common magnetic circuit as the said scott transformer for changing three phase into two phase of claim 1.

3,, it is characterized in that the iron core that T becomes and M becomes is twin columns or three posts as the said scott transformer for changing three phase into two phase of claim 1.

4,, it is characterized in that T becomes and M becomes independent magnetic circuit, a shared fuel tank as the said scott transformer for changing three phase into two phase of claim 2.

5,, it is characterized in that T becomes and M becomes independent magnetic circuit, respectively respectively with a fuel tank as the said scott transformer for changing three phase into two phase of claim 2.

6,, it is characterized in that being provided with between two fuel tanks the oil pipe road that can dock mutually and take apart as the said scott transformer for changing three phase into two phase of claim 5.

7,, it is characterized in that the oil pipe road that T becomes and the M change is passed between the fuel tank carries out electrical coupling as the said scott transformer for changing three phase into two phase of claim 6.