CN205069348U - Iron core single -phase auto -transformer is rolled up to dry -type - Google Patents

Abstract

The utility model discloses a dry-type coiled iron core autotransformer. The iron core is an open coiled iron core; the lower end of the open coiled iron core is fixed between the base and two lower clips, and the upper end is fixed between the two upper clips. The lower insulating pads are placed on the two lower clamps; the two sets of coils are respectively placed on the two vertical columns of the open-rolled iron core, and pressed on the lower insulating pads, and the upper insulating pads are evenly distributed on the two sets of coils. The upper end of the coil; the two upper clamps and the upper insulating pad are fixed by the compression device, so that the open coil core, the coil, the upper and lower pads and the compression device are compressed into a whole; the coil leads to the terminal at the upper and lower ends, and Connect the upper copper tube and the lower copper bar; the upper copper tube and the lower copper bar are fixed by the upper and lower clamps, and the leading ends of the upper copper tube and the lower copper bar are connected to form three outlets, and the three outlets are drawn out through insulators. The utility model has the advantages of high working efficiency, low no-load loss, low noise, environmental protection, strong insulation and flame retardancy, reduced maintenance times and low maintenance cost.

Description

Dry-type wound core single-phase autotransformer

technical field

The utility model belongs to the technical field of electrified railway power supply systems and relates to a single-phase autotransformer.

Background technique

With the rapid development of electrified railways, the AT power supply mode (autotransformer power supply mode) has become the main power supply mode for railway construction. At present, the structures of 27.5kV railway-specific autotransformers produced by domestic transformer manufacturers are all oil-immersed structures. Its shortcomings: First, the biggest problem of the oil-immersed structure is oil leakage, which pollutes the environment; second, because the oil-immersed insulating material is transformer oil, it has poor flame retardancy. Once a failure occurs, it is easy to burn, especially In the tunnel; Third, the oil-immersed transformer needs regular maintenance, and the cost is relatively objective.

At present, the core structure of large-scale transformers in my country basically adopts the stacked form, and the windings are wound separately. The manufacturing process of the later package is simple, but the utilization rate of the cross-sectional area of the stacked iron core is not high, resulting in no-load current and The no-load loss is relatively large. The wound core transformer can solve the problem of no-load loss and large no-load current, but requires that the winding must be wound directly on the iron core. Coil winding with an iron core requires special winding equipment, and the winding process is complex and difficult to operate. It is inconvenient and the winding speed is slow. The coil can only be wound after the iron core is produced, and it cannot be produced at the same time as the iron core. The production efficiency is extremely low, and it is basically impossible to achieve mass production.

Utility model content

The purpose of this utility model is to solve the above-mentioned problems existing in the prior art, and to provide a dry-type open coil iron core autotransformer, the iron core and the coil of the transformer can work simultaneously, and the manufacturing process is simple and the work efficiency is high; Reduce no-load loss, reduce noise, environmental protection, strong insulation and flame retardancy, reduce maintenance times, and low maintenance costs.

In order to achieve the above purpose, the technical solution of the utility model is: a dry-type wound core autotransformer, which includes a base, an iron core, two sets of coils, upper and lower insulating pads, two upper clamps, two A lower clamp, a pressing device, an upper copper pipe, a lower copper bar and an insulator; the iron core is an open coil core; the lower end of the open coil core is fixed between the base and the two lower clamps, and the upper end is fixed between the two upper clamps. Between the clips; the lower insulating pads are placed on the two lower clips; the two sets of coils are respectively placed on the two vertical columns of the open-rolled iron core, and pressed on the lower insulating pads, and the upper insulating pads are evenly distributed At the upper ends of the two sets of coils; the two upper clamps and the upper insulating pads are fixed by a compression device, so that the open-rolled iron core, coil, upper and lower pads and the compression device are compressed into a whole; the coils are drawn out at the upper and lower ends Terminals, and connect the upper copper tube and the lower copper bar; the upper copper tube and the lower copper bar are fixed by the upper and lower clamps, and the leading ends of the upper copper tube and the lower copper bar are connected to form three outlets, and the three outlets pass through Insulator lead-out: the lead-out terminal at the first end is the lead-out end F of the positive feeder winding, the middle lead-out terminal is the lead-out end N of the steel rail or integrated grounding terminal, and the end-lead terminal is the lead-out end T of the catenary winding.

The above-mentioned coil is a multi-layer cylindrical structure wound by copper wire, and is vacuum-cast by epoxy resin with filler.

The voltage level of the above-mentioned autotransformer is 27.5kV.

The iron core of the utility model adopts an open coil iron core, and after the opening can be opened, the upper and lower insulating pads, coils, and pressing devices are installed on the open coil iron core to form an integral structure, that is to say, the iron core of the utility model The core and the coil can be made separately, and then installed together. The winding of the coil is simple and easy, without special winding equipment. The core and the coil are made separately, and can be made at the same time to improve work efficiency. The utility model has the advantages of high working efficiency, low no-load loss, low noise, environmental protection, strong insulation and flame retardancy, reduced maintenance times and low maintenance cost.

Description of drawings

Fig. 1 is the front view of the utility model; (the front view should be added, and the drawings of the two coils can be seen)

Fig. 2 is the left view of the utility model;

Fig. 3 is a structural schematic diagram of the open wound iron core in the utility model.

detailed description

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

As shown in Figure 1, Figure 2 and Figure 3, this embodiment includes a base 1, an iron core 3, two sets of coils 5, upper and lower insulating pads 6, 4, two upper clamps 7, and two lower clamps 2. Compression device 8, upper copper pipe 10, lower copper bar 9 and insulator 11. The iron core 3 is an open wound iron core. The lower end of the open wound iron core 3 is fixed between the base 1 and the two lower clips 2, and the upper end is fixed between the two upper clips. The lower insulating spacer 4 is placed on the two lower clips 2 . The two sets of coils 5 are respectively set on the two vertical columns of the open wound iron core 3, and pressed on the lower insulating spacer 4, the upper insulating spacer 6 is evenly distributed on the upper ends of the two sets of coils 5, and the two upper clamps 7 and The upper insulating pad 6 is fixed by a compression device 8, and the compression device 8 is adjusted so that the open coiled iron core 3, the coil 5, the upper and lower insulating pads 6, 4 and the compression device 8 are compressed into a whole. The upper and lower ends of the two groups of coils 5 lead out terminals, and connect the upper copper tube 10 and the lower copper bar 9; the upper copper tube 10 and the lower copper bar 9 are fixed by the upper clamp 7 and the lower clamp 2, and the upper copper tube 10 and the lower The lead-out ends of the copper bars 9 are connected to form three lead-out ends, and the three lead-out ends are drawn out through the insulator 11: the lead-out terminal of the first end is the lead-out end F of the positive feeder winding, the middle lead-out terminal is the lead-out end N of the rail or integrated grounding terminal, and the end lead-out terminal The terminal is the terminal T of the catenary winding. Preferably, the coil 5 is a multi-layer cylindrical structure wound by copper wires, and is vacuum-cast by epoxy resin with filler. Preferably, the voltage level of the autotransformer is 27.5kV.

The above-mentioned embodiments are only preferred and exemplary, and those skilled in the art can make equivalent technical improvements according to the description of this patent, which are all within the protection scope of this patent.

Claims (3)

1. A dry-type wound core autotransformer, characterized in that: it includes a base, an iron core, two sets of coils, upper and lower insulating pads, two upper clamps, two lower clamps, and a pressing device , upper copper pipe, lower copper bar and insulator; the iron core is an open-rolled iron core; the lower end of the open-rolled iron core is fixed between the base and the two lower clamps, and the upper end is fixed between the two upper clamps; the lower insulating pad The block is placed on the two lower clamps; the two sets of coils are respectively set on the two vertical columns of the open-rolled iron core, and pressed on the lower insulating pad, and the upper insulating pad is evenly distributed on the upper ends of the two sets of coils; The upper clamp and the upper insulating pad are fixed by the pressing device, so that the open-rolled iron core, coil, upper and lower pads and the pressing device are pressed into a whole; the coil leads to the terminal at the upper and lower ends, and connects the upper copper tube and The lower copper bar; the upper copper tube and the lower copper bar are fixed by the upper and lower clamps, and the leading ends of the upper copper tube and the lower copper bar are connected to form three outlets, and the three outlets are drawn out through insulators: the first outlet terminal is The leading end of the positive feeder winding is F, the middle outgoing terminal is the leading end N of the steel rail or the integrated grounding terminal, and the terminal outgoing terminal is the leading end T of the catenary winding. 2. The dry-type wound core autotransformer according to claim 1, characterized in that: the coil is a multi-layer cylindrical structure wound by copper wires, and is vacuum-cast by epoxy resin with filler . 3. The dry-type wound core autotransformer according to claim 1 or 2, characterized in that: the voltage level of the autotransformer is 27.5kV.