CN219202935U

CN219202935U - Novel multi-output rectifier transformer for charging pile or power exchange station

Info

Publication number: CN219202935U
Application number: CN202222802143.7U
Authority: CN
Inventors: 牛振忠
Original assignee: Qingdao Zhenjie Electric Power Technology Co ltd
Current assignee: Qingdao Zhenjie Electric Power Technology Co ltd
Priority date: 2022-07-14
Filing date: 2022-10-24
Publication date: 2023-06-16
Anticipated expiration: 2032-10-24

Abstract

A novel multi-output rectifier transformer for a charging pile or a power exchange station comprises the following arrangement forms from inside to outside: core-low voltage winding-high voltage winding. The low-voltage winding wire adopts a high-electric strength turn-insulated wire, such as a double glass fiber coated winding wire, a Nomex paper coated winding wire and the like, so that the power frequency withstand voltage among various paths of output of the multi-path output of the low-voltage winding wire reaches more than 4000V/min (the oil immersed transformer is 5000V/min). The wires are wound in parallel in a corresponding winding manner in a manner of splitting in the radial direction, such as continuous, single spiral, double spiral or multiple spiral. The transposition is carried out in the winding process, so that the positions of the wires in the leakage magnetic field are basically the same, the length of each wire is basically the same, and the impedance voltage output by each path is basically the same. This structure also facilitates the heat dissipation of the transformer low voltage winding. The multi-output rectifier transformer for the charging pile or the power exchange station has the advantages of simple structure and low manufacturing cost.

Description

Novel multi-output rectifier transformer for charging pile or power exchange station

Technical Field

The utility model belongs to the technical field of rectifier transformers, and particularly relates to a novel rectifier transformer for a multi-output charging pile or a power exchange station.

Background

Along with the proposal of national energy conservation and emission reduction, low-carbon environmental protection policies, the production capacity of the electric automobile is gradually improved, the technical equipment for charging the battery of the electric automobile is gradually perfected and improved, and the charging time is also gradually shortened.

The rectifier transformers used to power the charging piles are now basically of two types:

1. a common distribution transformer, i.e. with a high voltage of 10kV and a low voltage of 400V, has a low voltage winding, which is basically in the form of a foil winding due to the high current. The coupling group is Dyn0, and a plurality of charging piles share one low-voltage winding, so that the charging piles are electrically isolated. The schematic diagram is shown in fig. 1.

In order to make the low-voltage winding capable of outputting in multiple ways and the impedance voltage of each output being basically consistent, the purpose of electric isolation of each output is achieved, and a low-voltage axial split structure is adopted, as shown in fig. 2.

Although the structure achieves the aim, as the high-voltage winding is arranged in the middle, in order to ensure the insulation level, the insulation distance between the high-voltage winding and the iron core needs to be increased, so that the manufacturing cost of the product is increased, and the heat dissipation of the product is not facilitated; secondly, the tapping and leading-out of the high-voltage winding are difficult, the manufacturing difficulty is increased, and the quality reliability is reduced; the low-voltage winding adopts a continuous double-cake structure, and the manufacturing difficulty and the cost are increased.

Disclosure of Invention

In order to solve the problems in the prior art, the novel multi-output rectifier transformer for the charging pile or the power exchange station is characterized in that a low-voltage winding wound by double glass fiber coated wires is split in the radial direction, the multi-path winding is wound by multiple wires simultaneously, and a high-voltage winding is wound on the periphery of the low-voltage winding; the structure not only ensures that the impedance and the voltage of each group are consistent, but also ensures that the insulation withstand voltage between each output reaches over 4000V/min (5000V/min for the oil immersed transformer), and each power supply port is mutually independent, so that the structure is convenient to use and achieves the purpose of electric isolation. The transformer is simple in structure, and effectively solves the problem that the current distribution transformer is unsafe in electricity.

A novel multi-channel output rectifier transformer for a charging pile or a power exchange station is characterized in that a low-voltage winding wound by a wire insulated by high-electric-strength turns is arranged on the periphery of an iron core, the low-voltage winding is split in the radial direction, a plurality of wires are adopted for simultaneous winding of the multi-channel winding, and a high-voltage winding is wound on the periphery of the low-voltage winding;

the low-voltage winding wire is not limited to a double glass fiber coated covered wire;

the low-voltage winding is wound in a radial split mode, m-n wires are arranged in parallel, each m wires are one path, and n paths of wires are output;

m≥1，n≥1。

the rectifier transformer may be provided with an auxiliary set of windings for providing power to the site.

The rectifier transformer is structurally provided with the iron core, the low-voltage winding and the high-voltage winding from inside to outside in sequence, so that the insulation level between the parts can be ensured, the insulation distance between the windings is reduced, and the production cost is reduced.

The low-voltage winding wire is wound by adopting a wire with high electric strength turn insulation, so that the insulation strength between each group of outputs is ensured to be more than 4000V/min, the oil immersed transformer is more than 5000V/min, the insulation requirement between each output is met, and the purpose of electric isolation between each output is achieved.

The winding structure of the low-voltage winding is in a radial split type, when the low-voltage winding is in 16-way output and every 2 wires are in one-way output, 32 wires are adopted for parallel winding, different winding modes are adopted according to the needs, and the manufacturing mode is flexible and changeable, so that various production needs are met.

Each wire adopts a transposition mode in the winding process, so that the positions of each wire in a leakage magnetic field are consistent, the lengths of the wires are consistent, and the aim of consistent impedance voltage output by each path is fulfilled.

Because the wires of the outputs of the paths depend on each other and are arranged from top to bottom along the axial direction, the heat dissipation height of the winding is increased, and the heat dissipation area of the winding is increased. In the use process, the heat of windings in each path can be dissipated through adjacent wires in time, and the heat dissipation problem of the product is effectively solved. Especially under the condition that the charging pile is not fully used, the heat dissipation effect is particularly obvious, and the temperature rise of the low-voltage winding is obviously reduced.

Drawings

Fig. 1 is a schematic diagram of a transformer for a general charging pile;

FIG. 2 is a schematic diagram of a low voltage axially split transformer;

FIG. 3 is a schematic diagram of a low voltage split transformer of the present patent;

FIG. 4 is a schematic diagram of the transformer of the present patent;

FIG. 5 is a schematic view of a low voltage four-spiral winding;

FIG. 6 is a schematic view of the high side outlet of the low voltage 16-way output profile;

FIG. 7 is a low voltage side out schematic view of a low voltage 16-way output profile;

in the figure: 1. a high voltage winding; 2. an iron core; 3. a low voltage winding; 4. a low voltage winding split radially.

Detailed Description

The utility model will be further described with reference to the accompanying drawings.

A novel multi-channel output rectifier transformer for a charging pile or a power exchange station is characterized in that a low-voltage winding wound by a wire insulated by high-electric-strength turns is arranged on the periphery of an iron core, the low-voltage winding is split in the radial direction, a plurality of wires are adopted for simultaneous winding of the multi-channel winding, and a high-voltage winding is arranged on the periphery of the low-voltage winding; the wire is not limited to a double glass fiber coated wire; the low-voltage winding is provided with m-n wires which are wound in parallel, and each m wires are one path and output in n paths; m is more than or equal to 1, and n is more than or equal to 1.

Taking a four-spiral winding with 16 paths of outgoing lines as an example, the number of turns of the winding is 7, each path of winding consists of 2 wires, the total number of the wires is 32, each wire is wrapped by a double glass fiber coating wire with the insulation thickness of 0.4mm, the insulation voltage-withstanding level between the paths of outgoing lines is ensured to reach 4000V/min, and the oil immersed transformer is more than 5000V/min.

The four-spiral winding consisting of 4 and 8 stacks of 32 wires is divided into 10 equal parts, and the total transposition is 32 times, so that after winding of the winding is completed, the leakage magnetism contained in the leakage magnetic field of each wire is identical, and the impedance voltage of 16 paths is identical in theory.

The specific winding is shown in fig. 5, the four-screw structure is shown, the double-sided outgoing line is in a first transposition at 5/10, the rest transposition at 4/10, and each double-screw is in a total transposition for 16 times.

Such a winding is also advantageous for heat dissipation of the windings when the 16 windings are not operating simultaneously, i.e. when the 16 sets of charging piles are not charging simultaneously.

The appearance diagram of the transformer with low-voltage 16-way output is shown in fig. 6 and 7, and the transformer is sequentially provided with an iron core, a low-voltage winding and a high-voltage winding which are split radially from inside to outside.

Claims

1. The utility model provides a novel multiway output fills electric pile or trades rectifier transformer for power station, its structure includes iron core, low voltage winding, high voltage winding, its characterized in that: the low-voltage winding is arranged on the periphery of the iron core and wound by a high-electric-strength turn-insulated wire, the low-voltage winding is split in the radial direction, the multi-path winding is wound by a plurality of wires simultaneously, so that the power frequency withstand voltage among all paths of output of the multi-path winding reaches more than 4000V/min, and the oil immersed transformer is more than 5000V/min; the low voltage winding is peripherally wrapped with the high voltage winding.

2. The novel multiplexed output rectifier transformer for a charging pile or a power exchange station according to claim 1, wherein: the wire is a double glass fiber coated wire.

3. The novel multiplexed output rectifier transformer for a charging pile or a power exchange station according to claim 1, wherein: the low-voltage winding is wound in a radial split mode, m-n wires are arranged in parallel, each m wires are one path, and n paths of wires are output.

4. A novel multiplexed output rectifier transformer for a charging pile or a power exchange station according to claim 3, wherein: m is more than or equal to 1, and n is more than or equal to 1.