At plot 01
We have 3 types of IDT - Wilson , Danish and Shirdi Sai electrical limited ,
Shirdi Sai Electricals (SSEL) and Wilson Power Solutions (Wilson) offer 33 kV, 18 MVA class transformers tailored for different markets. SSEL specializes in large-scale renewable projects, often using CRGO steel and copper windings for high short-circuit capability. Wilson focuses on high efficiency, frequently using amorphous metal cores for low losses.
Key Specifications & Differences (33kV / 18MVA Class)
Core Material: Wilson focuses on amorphous (low-loss) or CRGO, while SSEL, as a large OEM, likely utilizes high-grade CRGO (0.23-0.27mm) to minimize no-load losses.
Winding Material: Both offer copper windings as standard for 18 MVA, but Wilson often offers aluminum for lower power distribution units.
Efficiency: Wilson's 33 kV range is marketed for maximum efficiency (Tier 2/3 regulation compliant), prioritizing low-loss performance.
Design Focus: SSEL 33 kV transformers are often designed for rapid 33/400kV pooling in solar parks, while Wilson offers "unit-type" layouts (HV and LV on the same side) for compact utility substations.
Major Safety & Protection Features
Insulation: High withstand capability for impulse surge voltages, particularly crucial for solar applications.
Protection: Both typically feature Buchholz relay (alarm/trip), magnetic oil level gauge (MOG), pressure relief devices (PRD), and dial-type thermometers with trip contacts.
Short Circuit Withstand: Designed for short-circuit MVA capacity for 2-3 seconds.
Cooling: ONAN/ONAF (Oil Natural Air Natural / Oil Natural Air Forced) to manage 18 MVA heat dissipation.
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