Long-term reliability of amorphous alloy wound core distribution transformers

Journal Article · Sat Jan 01 04:00:00 EST 1994 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/61.277696· OSTI ID:7115266

Ezure, S; Imai, Y ^[1]; Sato, H; Yamada, S ^[2]; Yamanaka, K; Saito, S ^[3]

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1. Tokyo Electric Power Co. (Japan)
2. Takaoka Electric Manufacturing. Co. Ltd., Tokyo (Japan)
3. Hitachi Ltd., Tokyo (Japan)

In order to verify long-term reliability of amorphous alloy wound core distribution transformers, accelerated aging tests and field trials used by actual transformers were practiced. As for accelerated aging tests, short-circuit tests were added to imitate mechanical stress in operation on a utility's distribution system. As a result, even after the equivalent of 30 years, which was the normal expected transformer's life, magnetic characteristic was unchanged, so these transformers could be operated. Also, about field trials, two hundred transformers of four kinds were installed on a utility's distribution system to look into no-load characteristics. They were equipped with a mechanism to measure load current, background vibration and lightning surge current, so the influence for magnetic characteristic could be inspected. As a result, remarkable change wasn't seen even after six months.

• OSTI ID: 7115266
• Journal Information: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States) Vol. 9:1; ISSN 0885-8977; ISSN ITPDE5
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240100* -- Power Systems-- (1990-)
AGING
ELECTRICAL EQUIPMENT
EQUIPMENT
FIELD TESTS
PERFORMANCE TESTING
POWER DISTRIBUTION SYSTEMS
TESTING
TRANSFORMERS