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①, the original transformer, the secondary coil is concentrically set in an iron core column, within the low-voltage winding, high voltage winding. (Welding machine transformer original, secondary coil were installed in two core column)

Transformer in the load operation, when the secondary current increases, the transformer core to maintain the main flux unchanged, the primary current must also be increased accordingly to achieve the balance of secondary current.

Transformer secondary active power general = transformer rated capacity (KVA) × 0.8 (transformer power factor) = KW.

②, power transformers SMPS transformers are:

A, moisture absorber (silica gel tube): Contains silica gel, oil conservator (oil pillow) in the insulating oil through the absorber and atmospheric connectivity, desiccant absorbs moisture and impurities in the air to keep the transformer internal windings good Insulation; silicone discoloration, metamorphism easily lead to blockage.

B, oil level meter: reflect the toroidal transformers for audio oil level state, generally around +20 O, too high to put oil, too low fuel; winter temperature is low, the load light little change in oil level, or a slight decline in oil level; In summer, when the load is heavy, the oil temperature rises and the oil level rises slightly; both are normal.

C, oil pillow: oil tank adjustment, to prevent excessive oxidation of transformer oil, the upper part of the oil hole.

D, explosion-proof tube: to prevent sudden accidents caused by the explosion of fuel tank pressure accumulation.

E, signal thermometer: monitor the transformer operating temperature, send a signal. Indicating the upper transformer oil temperature, transformer coil temperature higher than the upper oil temperature 10 ℃. GB standard: the limit of the transformer winding operating temperature of 105OC; (that is, the ambient temperature of 40OC), the upper temperature should not exceed 95OC, usually to monitor the temperature (upper oil temperature) set at 85OC and below appropriate.

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