The dry-type transformers of 35kV level and below are insulated by epoxy resin. The products have the characteristics of flame retardant, low loss, low noise, low local discharge, good mechanical strength, safety and reliability. Generally installed in the distribution room or box-type substation, for lighting or power supply, the capacity is 31500kVA and below.
Normal operating noise is below 58 db 1) select high-quality core materials, select appropriate magnetic flux density and natural vibration frequency of the core. 2) the high-precision joger line with stepping shearing and automatic stacking function is adopted to reduce the burr of silicon steel sheet. 3) iron core stacking adopts "stepped full oblique step lap joint technology" to improve the magnetic flux distribution at the joints. 4) apply resin coating on the surface of the iron core to mitigate the vibration of the iron core. 5) silicone rubber and elastic components are used in all clamping parts to buffer and reduce amplitude.
Energy efficiency standards 1) adopt magnetic flux leakage (MFL) calculation, take effective measures to reduce the stray loss, at the same time effectively prevent local overheating and reduce the temperature rise of winding hot spots. 2) reasonable selection of coil conductor, reduce the winding eddy current loss, stray loss and other additional losses. 3) optimize the transposition between wires to make the cross-link flux even and reduce the circulation loss caused by magnetic leakage. 4) grooving is carried out on the iron core drawing board to reduce the loss of the structural parts of the iron core and prevent local overheating.
1) the solid insulation composed of high quality resin and glass fiber has high electrical strength and small partial discharge, which can be controlled within the range of ≤5pC. 2) low local discharge makes the transformer in the whole service life, without any cracks, no insulation level drop phenomenon.
1) the iron core is covered with insulating paint, and the coil is sealed with epoxy resin. It can operate in humid environment and has strong corrosion resistance. 2) in the case of high temperature open flame combustion, the transformer almost does not produce any smoke 3) combustion grade F1
1) the air cooling system is composed of several low-noise radial fans to reduce the temperature and increase the overload capacity. 2) it can be operated under long-term periodic load or temporary first-aid load.
1) the high pressure coil adopts resin pouring structure with good mechanical strength. 2) the low-voltage coil adopts foil structure, with uneven ampere-turns and small magnetic leakage, which reduces the axial mechanical force. 3) the drawing board and cushion block are used to compress the structure, so that the whole body is stable and firm.
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Resin Insulated Dry Type Transformer
Resin insulated dry type transformers of 35kV level and below