A proper value of the Building factor (BF) is important while calculating the No-Load Loss (NLL) of any power or distribution transformer. It is an empirically derived factor which is based on the experience of the Transformer Manufacturer (TM) and ranges from 1.08 to 1.35 for three phase, three limb cores. Step Lap (SL) construction of transformer core instead of conventional but type construction (or Non Step Lap (NSL) type) which is still widely used by TMs in India, has been successfully used by various TMs world over, to reduce the Building factor in Transformer cores by 5 to 8%, reduce the No Load current and the noise level relative to conventionally stacked NSL cores. This paper explains how SL laminations reduce the No Load Loss in a transformer by considering the specifics of magnetic Flux transfer in joints areas of an SL core versus an NSL transformer core. By 1947, the first catalogue containing design curves and other essential information on grain oriented steels was published.

The magnetic circuit is one of the most important active parts of any transformer. While the basic principle of transformation of energy has remained the same for over a century, since the first transformer was built, transformers have become more efficient due to improvements in materials and more sophisticated production processes (better manufacturing technology). However, the first Conventional Grain Oriented Steel (CGOS) grades known popularly today as M3, M4 and M5 were developed in the late sixties and the Hi-B Grain Oriented Steel grades (HG-OS) were developed in the early seventies whilst laser scribed material in the mid-eighties.

This paper examines one such production process which reduces the NLL, No Load current, and noise level of a transformer and hence improves its efficiency.

About KRYFS

KRYFS is India’s leading Transformer Core manufacturing company with a capacity to convert 50,000 MT per annum of CRGO Electrical Steel into transformer laminations and cores. Today, KRYFS services the entire value chain of energy supply from generation (of Solar Power), Transmission (through its EPC business) to distribution (through manufacture of transformers, cores, and fabrication) and employs over 750 people, all over India. KRYFS has nine manufacturing facilities for manufacturing of distribution and medium power transformers up to 10 MVA, 33 KV class, laminations, transformer cores, transformer tanks and lifting slings. Three units are located at Kherdi, in the Union Territory of Dadra and Nagar Haveli, one unit at Palghar, Maharashtra , three units in Vadodara and one in Bhopal.

 

About KRYFS

KRYFS is India’s leading Transformer Core manufacturing company with a capacity to convert 50,000 MT per annum of CRGO Electrical Steel into transformer laminations and cores.

Today, KRYFS services the entire value chain of energy supply from generation (of Solar Power), Transmission (through its EPC business) to distribution (through the manufacture of transformers, cores, and fabrication) and employs over 750 people, all over India.

KRYFS has ten manufacturing facilities for manufacturing of distribution and medium power transformers up to 10 MVA, 33 KV class, laminations, transformer cores, transformer tanks, and lifting slings. Four units are located at Kherdi, Union Territory of Dadra and Nagar Haveli, one unit at Palghar, Maharashtra, three units in Savli, Gujarat, and two in Bhopal, Madhya Pradesh.

We got 30 Years old in 2022.

About KRYFS

KRYFS is India’s leading Transformer Core manufacturing company with a capacity to convert 50,000 MT per annum of CRGO Electrical Steel into transformer laminations and cores.

Today, KRYFS services the entire value chain of energy supply from generation (of Solar Power), Transmission (through its EPC business) to distribution (through the manufacture of transformers, cores, and fabrication) and employs over 750 people, all over India.

KRYFS has ten manufacturing facilities for manufacturing of distribution and medium power transformers up to 10 MVA, 33 KV class, laminations, transformer cores, transformer tanks, and lifting slings. Four units are located at Kherdi, Union Territory of Dadra and Nagar Haveli, one unit at Palghar, Maharashtra, three units in Savli, Gujarat, and two in Bhopal, Madhya Pradesh.

We got 30 Years old in 2022.

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