On Load Distribution Transformer

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By fulfilling the BIS-1180 (Jan 2014) criteria, the on-load distribution transformer, under ISI approval, ranges from 200 KVA to 2500 KVA. While under IS-2026, the ranges of 2500 KVA to 5000 KVA, use standard voltage classes to achieve the highest efficiency levels. Below some critical points are discussed-

• Types of transformers - Pad-mounted – both for in and outdoor applications
• Paper insulated copper conductor with multiple layers
• Standards maintained- BIS-1180, IS-2026, and IEC 60076 
• Designed for less maintenance and silent operations, including a minimum guarantee of 15 years

Features of On-Load Transformer

• Step-lap design is used for the magnetic circuit to record lower losses and high-quality CRGO material with grades like ZDKH, ZDMH, AMORPHOUS, MOH, and others is used to record low magnetizing current within the core
• Sourced by regular and reputed vendor HINDALCO & STERLITE, the electrolytic grade with 99.99% pure high-quality Copper, is used for the electric circuit, including Foil winding in the L.V coil of the transformer
• Tolerance of lightning impulse and voltage surges due to High Dielectric Insulation property
• Effective cooling, by ONAN-based natural convection, through axial and radial ducts  

Technical Specifications

Consistent voltage fluctuations from the H.V. side require the installation of On-Load Transformers. Hence, AVR is used by the On-Load Transformers for tap changes to supply constant output voltage without any power cut. Thereby, optimization of total industrial power consumption results in power savings.

Benefits:-

• Use of On-Load Transformer helps in limiting the voltage at the L.V. side to balance the voltage fluctuations from the H.V. side
• Shut-down of the factory is not desirable during the tap changing and only the On-Load Transformer can eliminate this obstacle
• During automatic tap changes, the desirable range of L.V. side voltage can be maintained by using an RTCC panel with AVR (Automatic Voltage Regulator)
• The On-Load Transformer can enhance transformer efficiency and reduce the losses of the transformer and other equipment, resulting in power saving and an overall rise in the life-cycle of the transformer and other electrical equipment