Classification standards for transformers
1. According to the voltage level, it can be divided into: 1000KV, 750KV, 500KV, 330KV, 220KV, 110KV, 66KV, 35KV, 20KV, 10KV, 6KV, 0.66KV, 0.38KV, 0.22KV, etc.
2. According to the insulation and heat dissipation medium, it is divided into: dry-type transformer and oil-immersed transformer. Dry-type transformer is further divided into: SCB epoxy resin cast dry-type transformer and SGB10 non-encapsulated H-class insulated dry-type transformer.
3. According to the core structure material: silicon steel laminated transformer, silicon steel coil core transformer, amorphous alloy core transformer.
4. According to the design energy-saving sequence: SG, SJ, S7, S9, S11, S13, S15.
5. According to the number of phases: single-phase transformer, three-phase transformer.
6. According to capacity: my country's current rated capacity of transformers: 3KVA, 5KVA, 10KVA, 15KVA, 20KVA, 25KVA, 30KVA, 40KVA, 50KVA, 80KVA, 100KVA, 125KVA, 160KVA, 200KVA, 250KVA, 315KVA, 400KVA, 500KVA, 630KVA , 800KVA, 1000KVA, 1250KVA, 1600KVA, 2000KVA, 2500KVA, 3150KVA, 4000KVA, 5000KVA, etc.
2. Specifications and models of transformers
The specifications, models and meanings of transformers. There are many specifications and models of transformers, and the meanings of different types and specifications are also different.
Common: dry type transformer
The meaning of "SCB10-1000KVA/10KV/0.4KV" dry-type transformer:
S means that the transformer is a three-phase transformer. If S is replaced by D, it means that the transformer is a single-phase transformer.
C means that the (dry-type transformer) windings are resin cast solids.
B means foil winding, if it is R, it means wound winding, if it is L, it means aluminum winding, if it is Z, it means on-load voltage regulation (copper is not marked).
The number 10 represents the design serial number, also called the technical serial number.
1000KVA represents the rated capacity of this transformer (1000 kVA).
10KV means primary rated voltage, 0.4KV means secondary rated voltage.
The meaning of common "power transformer" specifications and models
The model of a power transformer: usually consists of symbols indicating the number of phases, cooling method, voltage regulation method, winding core and other materials, as well as the transformer capacity, rated voltage, and winding connection method.
For example: "SFSZ9-31500/110" transformer model meaning
S: three-phase, F: air-cooled, S: three-winding, Z: on-load voltage regulation, 9: design number type 9.
31500: Rated capacity is 31500kVA
110: Primary side rated voltage 110kV
Specifications and models of box-type transformers: Box-type transformers (usually referred to as "box transformers") design traditional transformers in a box-type casing. They have small size, light weight, low noise, low loss, and high reliability, and are widely used in Residential areas, commercial centers, light stations, airports, factories, mines, enterprises, hospitals, schools and other places.
Box-type substations are generally divided according to capacity (KVA): 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000. This is the national standard capacity sequence.
3. Transformer specifications, models and explanations
Classification standards and commonly used specifications and models of transformers
Specifications are divided into 36 kV, 110 kV, 0.4 kV, 10 kV, 22 kV, 6 kV, 35 kV, 110 kV, 220 kV, 350 kV, 200 kV, 500 kV according to voltage. Volt, 250 kV, 600 kV
In terms of capacity, the current rated capacity of transformers in my country is calculated according to the R10 priority coefficient, which is calculated as a multiple of 10 raised to the power of 10, 50KVA, 80KVA, 100KVA, etc.
There are too many models of transformers. The model of the transformer consists of: number of transformer windings + number of phases + cooling method + whether forced oil circulation + on-load or no-load voltage regulation + design serial number + "-" + capacity + high-voltage side rated voltage.
Such as: SFPZ9-120000/110
It refers to a three-phase (the number of windings is omitted for a double-winding transformer. If it is a three-winding transformer, there is an S in front of it). The double-winding forced oil circulation air-cooled on-load voltage regulation, the design number is 9, the capacity is 120000KVA, and the rated voltage of the high-voltage side is 110KV transformer.
The capacity of the transformer, according to the national standard capacity, is: 30KVA, 50KVA, 63KVA, 80KVA, 100KVA, 125KVA, 160KVA, 200KVA, 250KVA, 315KVA, 400KVA, 500KVA, 630KVA, 800KVA, 1000KVA, 1250KVA, 1600KVA, 2000KV