Resin cast Transformer

Main features :

• Magnetic circuit with CRGO lamination M3 to M5, MOH and ZDKH types
• Electric circuit: copper 99.9% pure electric grade, foil for LV and strip for HV, duly casted with resin under vacuum
• Dielectric circuits: Nomex glass fiber components along with resin casted components
• Thermal Circuit: natural cooling through effective axial and radial ducts and air vent between LV to HV and LV to Core

Specific features:

• Design conforms to relevant standards IEC 76, IEC 726, IS 11171, IS 2026 and as per any other international standards
• Designed to withstand short circuit forces, thermal stresses and electrical impulses. Low partial discharge
• Low load power losses and low noise
• Fire retardant, compact and best suited for indoor installations
• Installation can be very close to load center thereby LT cable cost saving
• Advanced manufacturing techniques to ensure.mst effectiveness
• Reliable, user friendly, easy to install and occupies less space

Specification:

• Cast resin dry type transformer 11kv/433V, 3phase, 50 Hz.
• Off circuit tap links +/-5% in steps of 2.5%.
• Class F and H insulation.
• HV Delta connected, LV Star connected with Dyn 11 vector group.
• Installation can be very close to load center thereby LT cable cost saving
• Natural air cooling and forced air cooling.
• Duty cycle – continuous.
• Winding- copper duly resin casted.
• Enclosure - IP 23 to IP 33 and as per customer specifications.
• Cable boxes on HV and LV.
• Painting shades as per IS and IEC standards.

Standard fittings:

• Rating and diagram plate
• Earthing terminals-2
• Off-circuit tap links
• Enclosure-IP 21 For Indoor/IP 43 for Outdoor application
• Jacking lugs

Optional accessories:

• PT-100 sensors in each coil
• Winding temperature scanner with alarm and trip coil

Inspection and testing:

• Incoming material inspection at vendors place
• Stage inspections at end of each process
• Identification and traceability

Final routine tests as per IS and IEC standards conducted as follows:

• Voltage ratio
• Winding resistance
• Impedance voltage
• No load current with losses and load losses
• Separate source voltage withstand test
• Insulation measurement
• Induced over voltage test
• Noise level measurement