A complete set of transformer models and specifications makes it easy to choose the right transformer.

When we choose distribution transformers at ordinary times, if the capacity is too large, it will form the phenomenon of "big horse-drawn car", which will not only increase the equipment investment, but also make the transformers stay in no-load state for a long time and increase the reactive power loss; If the transformer capacity is too small, it will be overloaded for a long time, and it is easy to burn out the transformer, whether it is an autotransformer or a three-phase transformer. Therefore, the correct selection of transformer is one of the important measures to reduce power loss and save energy. In practical application, we can choose the transformer according to the following simple methods.

Transformer model and specification

The model of transformer consists of: number of transformer windings+number of phases+cooling mode+forced oil circulation or not+on-load or off-load voltage regulation+design serial number+"-"+capacity+rated voltage of high voltage side. ? Such as: sfpz9-120000/110? Refers to a three-phase (two-winding transformer omits the number of windings; if it is three-winding, there is an S in front) transformer with the design serial number of 9, the capacity of 120000kva and the rated voltage of the high-voltage side of1/0kv. ? Classification of transformers:

1. According to the cooling methods, there are natural cooling, air cooling, water cooling, forced oil circulation air (water) cooling and water cooling.

2. According to the moistureproof methods, it can be divided into open transformers, encapsulated transformers and sealed transformers. ? 3. According to the core or coil structure: core transformer (plug-in core, C-core and ferrite core), shell transformer (plug-in core, C-core and ferrite core), ring transformer, metal foil transformer and radial transformer.

4. According to the number of power phases: single-phase transformer, three-phase transformer and multi-phase transformer. ? 5. Classification by use: there are power transformers, special transformers (electric furnace transformers, rectifier transformers, power frequency test transformers, voltage regulators, mine transformers, audio transformers, intermediate frequency transformers, high frequency transformers, impulse transformers, instrument transformers, electronic transformers, reactors, voltage regulators, transformers, etc. ).

6. According to the classification of cooling media, there are dry transformers, liquid (oil) immersed transformers and inflatable transformers.

7. According to the number of coils, there are autotransformers, double windings, triple windings and multi-winding transformers.

8. According to the conductive materials, there are copper wire transformers, aluminum wire transformers, semi-copper, semi-aluminum and superconducting transformers.

9. According to the voltage regulation mode, it can be divided into non-excitation voltage regulating transformer and on-load voltage regulating transformer. ? 10. According to the level of neutral point insulation, there are fully insulated transformers and semi-insulated (graded insulation) transformers.

Correct selection of transformer is one of the important measures to reduce loss and save energy in power grid. In practical application, we choose the correct transformer model according to our different needs.

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