Dry type power transformer refers to the transformer whose core and winding are not impregnated in insulation oil. Dry type power transformer can be cooled by natural air cooling (AN) and forced air cooling (PF). The following billion electric teach you a full understanding of dry power transformers.
Dry type power transformer structure type
There are two types of dry-type transformer structure: fixed insulation enveloping (SCB type) and unenveloping winding structure. There are two kinds of concentric and overlapping winding from high to low position. Concentric structure is simple, easy to manufacture, most dry transformers use this structure. The crossover type is mainly used in the manufacture of special transformers.
Specification of dry type power transformer
In SCB a 11 1250 kva / 10 KV / 0.4 KV dry-type transformer as an example, to explain the dry type transformer model significance: S three-phase power transformer, transformer winding for solid resin casting molding, C said in C letters G the coil winding, 11 for the serial number, 1250 va for transformer rated capacity, 10 KV transformer primary side for rated voltage, 0.4 v rated voltage for the transformer secondary side.
Technical parameters of dry type power transformer
Frequency 50 hz
No load current, less than 4% required
Low voltage strength 2KV/min no breakdown
The low voltage side of insulation resistance shall be no less than 2M ohms
Natural air cooling or temperature controlled air cooling
Noise factor is less than 30dB
New standard for dry type power transformers
Since the date of the announcement, the applicant shall apply for certification by the new standard, CQC certification certificate issued by the new standards, for it is according to the old standard certification, product, the applicant shall submit to the CQC convert the new standard certification application, and accept the laboratory for the new and old standard difference test project (see attachment) on the implementation of inspection, after completion of testing and qualified CQC for its renewal the new standard certification. Old version of the standard certification certificate conversion should be
Completed before March 31, 2017, CQC will suspend the conversion certificate if it is not completed within the time limit. If the certificate conversion is not completed before June 30, 2017, the old standard certification certificate shall be revoked.
1. GB/T 10228-2008 is replaced by GB/T 10228-2015;
2. The content corresponding to the technical requirements of dry-type transformers in annex 1 is revised;
3. Revised product description of dry type transformer.
Characteristics of dry type power transformer
1. Low loss, good power saving effect and economical benefit in operation.
2. Flame-retardant, explosion-proof, pollution-free, maintenance-free, and distributed installation in load center, reducing investment cost and saving costs.
3. Local discharge is less than 10PC, the coil does not absorb moisture and dust, with high mechanical strength and good reliability.
4. Good resistance to short circuit and lightning impact.
5. The shell is made of stainless steel, cold plate and aluminum alloy, of different types: air type and heat dissipation type. The incoming and outgoing lines can be upward, downward, upward and downward.
6. The transformer can be equipped with temperature control and temperature display system according to the needs of users, which can be used together with the temperature control system.
Application of dry type power transformer
Dry type power transformer is a kind of dry type transformer with high electrical strength, mechanical strength and heat resistance, which is an excellent product of urban power grid transformation, especially suitable for high-rise buildings, airports, power stations, commercial centers and other important places requiring fire prevention, explosion proof and moisture proof.
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