High temperature resistant liquid immersed traction transformer for electrified railway

Kategorie:Oil immersed transformer


Product category: product center oil immersed transformer

Product Description: win in stability, safe and reliable

Safe and reliable, life-long anti short circuit;

State control and life management;

Energy saving and high temperature resistance

Process features:


High temperature resistant hybrid insulation system.


The small and medium capacity of high-voltage coil is tangled one by one continuous type, and the large capacity is inner screen one by one continuous type, so as to improve the longitudinal capacitance distribution of coil under impulse voltage; The coils are of guide oil circulation structure to reduce the winding temperature rise, and the product design life is 30 years.

Full automatic lamination

The robot is fully automatic lamination and adopts a fully inclined 45 degree 7-step seam structure.

Iron core

High conductivity magnetovolt oriented cold rolled silicon steel sheet, non hole binding, frame structure and D-shaped iron yoke structure will be used as coils to replace large-area platforms and step joints. The automatic cutting lamination robot imported from Switzerland ensures that the iron core burr is 20um. The multi-stage joint of iron core reduces the no-load loss, no-load current and noise level.


There are two kinds of minute cover structure and barrel structure. All seals shall be provided with end limit seals; The metal parts inside and outside the box are rounded and roughened, and the welds and seals have been tested for leakage for three times (fluorescence, positive pressure and negative pressure leakage test); The paint shall be made according to the anti rust requirements of household appliances.

Performance characteristics:

Application characteristics of traction transformer for Electrified Railway:

1. Secondary load short circuit trips frequently;

2. The transformer is often impacted by operating overvoltage;

3. The load is extremely unbalanced, sometimes the overload multiple is high in a short time, while the time fork with space-time load or light load is long;

4. The voltage fluctuation is steep, especially the bus voltage of remote substation. The no-load voltage is high, more than 29kv, and the voltage drop is large under heavy load, less than 24kV:

5. Single phase load;

Requirements of railway department for the use of traction transformer:

1. Safety and reliability: This is the most basic work goal of the railway department. The traction transformer is a key equipment in the whole electrified railway. If the power failure of the whole substation is caused by the quality problem of the transformer, it will cause huge losses to the transportation and production;

2. Low loss and excellent energy saving: it can significantly reduce the production cost;

3. Low loss, low temperature rise and strong overload capacity: improve capacity utilization and save costs;

4. Less maintenance, no maintenance and no interruption of power supply time, so as to achieve the principle of "state control and life management".

Type of traction transformer:

1. 110kV and 220kV single-phase traction transformer: used for at power supply and direct supply;

2. Ll0kV and 220kV V / V connection traction transformer: used for at power supply and direct supply;

3. 110kV and 220kV balanced Traction Transformers: for direct supply:

4. Self coupling transformer: used for at power supply;

220kV single-phase traction transformer:

Due to the large capacity of 22nkv power supply network, the harmonic and negative sequence components generated by 220kV single-phase traction transformer have little impact on 220kV power supply network: 220kV power supply system has more stability and reliability, single-phase power supply is more in line with the characteristics of railway power consumption, simple protection and small investment, which can effectively reduce the railway operation cost. With the development of China's economy and power system, 220kV single-phase traction power supply is an inevitable trend.

The connection group of single-phase traction transformer is i-i. according to the capacity or user requirements, the internal wiring can be series or parallel respectively.

V / V connection traction transformer:

V / V connection transformer is one of the forms of transformer for railway traction, and it is the specific application of single-phase transformer in railway traction; This type of transformer has two structural forms. One structural form is that two single-phase transformers are placed in the same oil tank, that is, the three column structure. The coils of the two single-phase transformers are respectively sleeved on the side columns of the two iron cores. There is no coil on the middle column of the iron core, which only forms the magnetic flux circuit; Another form is the joint use of two transformers, namely four column structure; In these two structural forms, there are two single-phase transformers with equal capacity and unequal capacity.