Cast resin transformers
For European market ,the calculation is made according to Ecodesign regulation, norms EN 50588-1.
The core is built up of cold rolled oriented grain steel sheet with low specific losses, cut at 45° step-lap.
Uniform pressing stiffness and solidity of the columns assure a low noise level.
The medium voltage windings are made of aluminium electrolytic conductors, the low voltage windings are made of strip or foil.
Technical featuresStandard: the transformers are built in accordance with IEC 60076-11 standards and with efficiency as per EN 50541-1.
Core: the core is built up of cold rolled oriented grain steel sheet with low specific losses, cut at 45° step-lap. Uniform pressing stiffness and solidity of the columns assure a low noise level.
Medium voltage windings: the medium voltage windings are made of aluminium electrolytic conductors (wire of foil strips depending upon power and voltage requirements). It is possible to produce copper windings. The windings are inglobed under vacuum in class F epoxy resin. The accuracy of execution of these processes allows the achievement of windings free from partial discharges.
Low voltage windings: the low voltage windings are made of strip or foil (copper or aluminium conductors depending upon power and voltage requirements). Class H insulating material is used.
Standard accessories: skid under base or truck with bidirectional wheels; lifting lugs; grounding terminal.
Optional accessories: temperature monitoring unit (or thermometer dial type); forced ventilation system; box with protection degree IP 21 (or other IP 23, IP 31, IP 45...).
Test: all transformers are singularly tested with routine test, according to IEC 60076-11 standards. Upon request the type test can be carried out: temperature rise test, full wave impulse test, sound level.
Installation: inside. For eventual installation outside specify ambient conditions.
High short circuit strength: the coil manufactured with epoxy resin has a robust structure and can better stand against the electromechanical force occurring during short circuit, external impacts, abnormal vibrations.
High overload capacity: due to the high thermal time constant, the coil made with epoxy resin can endure high overloads for a short time.
Fire resistant: the epoxy coils have a self fire extinguishing performance, safe in case of electrical sparks.
Compact size: compact size, especially in depth, can give advantage in installation room.
Environmental safe: comparing to oil immersed, resin transformers is free from environmental pollution due to oil leakagel.
Maintenance free: the coils cast with epoxy resin do not suffer from deterioration of insulating material properies due to humidity and moisture; furthermore, there are no joints or valves. Simple to maintain.
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