CN204732270U - A kind of buried six phase 12 pulse wave rectifier transformers - Google Patents

Abstract

An underground six-phase 12-pulse rectifier transformer to optimize the power supply scheme of prefabricated substations and box-type substations, minimize the footprint of substations, and facilitate construction, installation, operation and maintenance. Including sealed oil tank and core and winding immersed in insulating oil. The sealed oil tank is fixedly arranged in the concrete pit. Each phase is composed of 4 coils. The high-voltage side of the transformer is divided into upper and lower branches, which are connected in parallel. The two coils on the valve side are respectively led out by y-connection and d-connection. The rated voltage of the high-voltage side of the winding is 10kV, the rated voltage of the low-voltage side is 0.59/0.59kV, and the capacity is 1600kVA; the cable inlet and outlet lines of the high-voltage side and low-voltage side are connected to the pre-installed substation or box-type substation through fully sealed plug-in cable terminals. switchgear connection.

Description

A buried six-phase 12-pulse rectifier transformer

technical field

The utility model relates to an underground six-phase 12-pulse rectifier transformer used in urban rail transit projects.

Background technique

In most urban rail transit projects, the six-phase 12-pulse rectifier transformer used in the traction substation to supply power to the traction network is an indoor, natural air-cooled, epoxy resin-cast dry-type transformer, and the transformer adopts a stacked core type. structure, the no-load loss is relatively large, and the requirements for the surrounding operating environment are relatively high. In a humid environment, partial discharge indicators are prone to damage, resulting in equipment failure. Since the rectifier transformer installed indoors generates relatively large heat and occupies a large space, it is not suitable for use in prefabricated substations or box-type substations.

Utility model content

The technical problem to be solved by the utility model is to provide a buried six-phase 12-pulse rectifier transformer to realize the optimization of the power supply scheme of the prefabricated substation and the box-type substation, reduce the floor area of the substation to the greatest extent, and facilitate Construction, installation and operation and maintenance.

The technical scheme adopted in the utility model is as follows:

An underground six-phase 12-pulse rectifier transformer of the utility model includes a sealed oil tank, an iron core and a winding immersed in insulating oil, and is characterized in that: the sealed oil tank is fixedly arranged in a concrete pit; The phase is composed of 4 coils. The high-voltage side of the transformer is divided into upper and lower branches, which are connected in parallel. The two coils on the valve side are respectively led out by y-connection and d-connection; the rated voltage of the high-voltage side of the winding is 10kV, and the rated voltage of the low-voltage side is 0.59/ 0.59kV, capacity 1600kVA; the high-voltage side and low-voltage side cable inlet and outlet lines are connected to the switchgear in the prefabricated substation or box-type substation through fully sealed plug-in cable terminals.

The beneficial effect of the utility model is that the sealed oil tank is directly installed in the pit, and can be fully immersed in water for a period of time to continue running; the floor space of the substation can be reduced to the greatest extent, so as to realize prefabricated substations and box-type substations The optimization of the power supply scheme can fully adapt to the various operational needs of the current urban rail transit projects, especially the modern tram projects; Avoid external damage or theft; adopt oil-immersed, waterproof and fully sealed, fully insulated, and fully shielded design, which is less affected by the external environment, has good overall performance, and can be maintenance-free during the service life; compared with traditional ground rectifier transformers In comparison, the noise is greatly reduced, and it can also prevent the radiation of electromagnetic waves and reduce the pollution to the environment.

Description of drawings

This manual includes the following three drawings:

Fig. 1 is a structural representation of a buried six-phase 12-pulse rectifier transformer of the present invention;

Fig. 2 is a top view of a buried six-phase 12-pulse rectifier transformer of the present invention;

Fig. 3 is a perspective view of a buried six-phase 12-pulse rectifier transformer of the present invention;

The components and corresponding marks are shown in the figure: concrete structure pit 10, sealed oil tank 11, iron core 12, pressure relief valve 13, fully sealed plug-in cable terminal 14, signal thermometer seat 15, prefabricated substation or Box-type substation 20, switchgear 21.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Referring to Fig. 1, a buried six-phase 12-pulse rectifier transformer of the present invention includes a sealed oil tank 11, an iron core 12 and a winding immersed in insulating oil. The sealed oil tank 11 is fixedly arranged in the concrete pit 10 . Each phase is composed of 4 coils. The high-voltage side of the transformer is divided into upper and lower branches, which are connected in parallel. The two coils on the valve side are respectively led out by y-connection and d-connection. The rated voltage of the high-voltage side of the winding is 10kV, the rated voltage of the low-voltage side is 0.59/0.59kV, and the capacity is 1600kVA. Both the high-voltage side and low-voltage side cable inlet and outlet lines are connected to the switchgear 21 located in the prefabricated substation or box-type substation 20 through the fully sealed plug-in cable terminal 14 . . Two buried six-phase 12-pulse rectifier transformers in the same substation or adjacent substations can form an equivalent 24-pulse rectifier to optimize the power supply scheme of prefabricated substations and box-type substations, and minimize the occupation of substations. The area is large, and it is convenient for construction, installation, operation and maintenance.

The winding wiring groups Dd0, y11 (primary side phase shift + 7.5°), secondary side voltage phase angle difference 30°, impedance voltage unbalance rate ≤ 1.5%, short circuit impedance percentage 6% (full short circuit of both windings on the valve side ), to meet 100% rated load - continuous, 150% rated load - 2 hours, 300% rated load - 1 minute.

The iron core 12 adopts a 45° fully oblique seam laminated structure iron core or a rolled iron core structure, and is made of cold-rolled silicon steel sheets with high magnetic permeability and low loss.

Referring to Fig. 2 and Fig. 3, the sealed oil tank 11 has expansion performance, and the cable inlet and outlet lines of the high-voltage side and the low-voltage side are connected to the switchgear 21 located in the prefabricated substation or box-type substation 20 through the fully sealed plug-in cable terminal 14 Connect to realize the function of waterproof and fully sealed, and it can be fully immersed in water for a period of time to continue to operate. A pressure release valve 13 and a signal thermometer seat 15 are arranged on the top of the sealed oil tank 11 .

The above description is only to illustrate the principle of a buried six-phase 12-pulse rectifier transformer of the present invention, not to limit the present invention to the specific structure and scope of application shown in the figure and described, so any All corresponding modifications and equivalents that may be utilized belong to the patent scope of the utility model application.

Claims (3)

1. A buried six-phase 12-pulse rectifier transformer, comprising a sealed oil tank (11) and an iron core (12) and windings immersed in insulating oil, characterized in that: the sealed oil tank (11) is fixedly arranged In the pit (10) of concrete structure; each phase is composed of 4 coils, the high voltage side of the transformer is divided into upper and lower branches, which are connected in parallel, and the two coils on the valve side are respectively led out by y-connection and d-connection; the high-voltage side of the winding is rated The voltage is 10kV, the rated voltage of the low-voltage side is 0.59/0.59kV, and the capacity is 1600kVA; the cable inlet and outlet lines of the high-voltage side and low-voltage side are connected to the pre-installed substation or box-type substation (20 ) The switchgear (21) inside is connected. 2. An underground six-phase 12-pulse rectifier transformer as claimed in claim 1, characterized in that: the winding wiring groups Dd0, y11, the phase angle difference of the secondary side voltage is 30°, and the impedance voltage is unbalanced Rate ≤ 1.5%, short-circuit impedance percentage 6%, to meet 100% rated load - continuous, 150% rated load - 2 hours, 300% rated load - 1 minute. 3. The buried six-phase 12-pulse rectifier transformer according to claim 1, characterized in that: the iron core (12) adopts a laminated structure iron core with 45° fully oblique slots.