Solar Transformer

With the continuous expansion of the solar photovoltaic power generation industry, the demand for dry-type transformers for photovoltaic power generation has increased year by year. To expand market share and enhance the competitiveness of enterprises, our company has developed dual-windings for solar photovoltaic power based on the technical characteristics of the product. Double split dry type transformer.

1. Distributed photovoltaic dry-type transformers are composed of photovoltaic dry-type transformers, distribution cabinets and shells;
2. The product shell material adopts aluminum alloy plate, stainless steel plate, composite plate, glass fiber reinforced water plate, etc.;
3. The base is made of galvanized channel steel or cement, which has strong corrosion resistance and sufficient mechanical strength;
4. The top cover of the box adopts a double-layer structure and has good heat insulation, radiation protection and ventilation effects;
5. Each room is separated by an iron plate to form an independent chamber. Each room has no lighting facilities. The top of the transformer is equipped with an automatic exhaust device to regulate the temperature of the transformer room;
6. The color of the box is flexible and can be coordinated with the surrounding environment.

1. The transformer is generally used in high altitude areas.
2. The transformer is generally a double-winding double split resin cast dry type transformer.
3. The transformer is generally used as a step-up transformer when connected to the grid.
4. The low voltage is generally 0.27kV, 0.3kV, 0.315kV. Two groups of low voltage coils each successively connect a group of inverters.
5. High pressure using 10kV or 35kV, and connected to the grid
6. Harmonic should be considered when designing the transformer.

The transformer is generally used in high altitude areas.

1. Combining the characteristics of the above solar photovoltaic dry-type transformers, the solar photovoltaic dry-type transformers can be divided into 10kV-level products and 35kV-level products.
2. 10kV grade products due to moderate voltage, the insulation structure is easier to deal with, so our company in the production of traditional double-winding double-split structure design, the two groups of low-voltage coil axial split, the two groups of high-voltage coil axial arrangement, pouring two groups. The coil is cast into a coil and the two coils are electrically led in parallel.
3. 35kV products due to high voltage, in order to ensure the coil has good electrical properties, such as partial discharge, lightning impact performance, our company in the design of the low-voltage coil for a special structure, according to the company's low-voltage coil structure After processing, the high voltage coil can be made into a coil, reducing the number of high voltage coil turns, so the number of high voltage coil segments and the number of layers are reduced, and the electric field distribution inside the coil is more uniform.

1. According to the national standard GB1094. 11, when the transformer is manufactured in a factory where the altitude is less than or equal to 1000m, and the actual operation of the transformer exceeds 1000m above sea level, a high altitude correction of the insulation and temperature rise of the transformer must be performed during the factory test;

2. For temperature rise: For every 500 meters increased, the temperature rise of the self-cooled transformer should be lower than the national standard by 2.5%, and the air-cooled transformer should be lower than the national standard by 5%;

3. For external insulation: When the transformer is operated at an altitude between 1000 and 3000 meters, but the test is performed at a normal altitude, the rated short-duration power frequency withstand voltage is according to the installation site more than 1000 meters.100 meters increase by 1%.

1. The input voltage of photovoltaic dry-type transformer is not an ideal sine wave. Due to the one-way conductive effect of the silicon rectifying element, the current drawn by the rectifier unit from the AC power system is non-sinusoidal. The Fourier series can be decomposed into a fundamental wave and a series of harmonics of different frequencies and amplitudes. The presence of harmonics will increase the loss and temperature rise of the transformer. The influence of harmonics on the transformer coil must be taken into account in the transformer design.
2. The eddy current loss of the coil is proportional to the square of the harmonic current and the square of the number of harmonics.
3. The stray loss of the coil is proportional to the square of the harmonic current and the 0.8th power of the harmonics.
4. The temperature rise of the coil is proportional to the 0.8th power of the coil loss.
5. Transformer design must consider the impact of h armonic loss and loss on temperature rise.
 

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