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- ETT - On-Load Distribution Transformer
ETT - On-Load Distribution Transformer
On-Load Distribution Transformers are engineered to meet the requirements of varying load conditions, ensuring operational efficiency and stability in electrical distribution. These transformers are designed in compliance with BIS-1180 (Jan 2014) and IS-2026 standards, offering a capacity range from 200 KVA to 5000 KVA. They utilize automatic voltage regulation for tap changes, which allows them to supply a constant output voltage even amidst significant input voltage fluctuations. This capability aids in optimizing industrial power consumption, resulting in noticeable power savings. On-Load Transformers are essential for industries experiencing frequent voltage variations, as they help maintain uninterrupted power supply without service cuts, ultimately enhancing the overall reliability and performance of electrical systems.
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
- 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
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.
- Type : Indoor/ Outdoor
- Voltage Class : 3.3, 6.6, 11, 22, 33 KV.
- Vector Group : Dyn11 or other specified by customer
- No. of phase : 3 phases
- Frequency : 50/60 Hz
- Tap Range : ±10 %, +5% to -15% in 1.25% steps in 17 positions
- Winding Material : Copper with multiple paper covering
- Applicable Standards : IS-1180:2014 (Part-1), IS-2026, IEC 60076
- Painting : Epoxy or specified by customer
- 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