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How long typically is required to reach uhv?

Ultrasonic sensor

Distribution transformer

Partial discharge

Fault (power engineering)

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Reaching Ultra High Voltage (UHV) involves different timelines depending on the specific system or technology being discussed. For instance, the development of UHV transformers in Japan occurred in two significant stages, spanning from the 1970s to the 1990s, involving the testing of prototypes and field tests over a decade to ensure long-term operation . On the other hand, in the context of UHV transmission systems, studies have shown that the front time of switching impulse voltages exceeding 1000 μs can impact breakdown characteristics and insulation design, with proposed increases in U50 values and deviations from standard impulse tests . These examples highlight that the time required to achieve UHV capabilities can vary significantly based on the specific technology or system under consideration.

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Journal Article•DOI Development and long‐term field tests for UHV, 3000‐MVA transformers in Japan Yukiyasu Shirasaka 01 Jan 2009-Ieej Transactions on Electrical and Electronic Engineering	The development of UHV transformers in Japan occurred in two stages during the 1970s and 1990s, with field tests lasting over 10 years to verify long-term operation.
Proceedings Article•DOI Design of UHV Long-distance GIL Fault Location System Based on Ultrasonic Method Hui Xu, Zhang Pengfei, Lin Cheng, Ninghua Wang, Dexin Nie, Mengqi Li - Show less +5 more 30 Oct 2020	Not addressed in the paper.
Journal Article•DOI Problems of Long-Term Reliability for UHV Transformer Insulation T. Yanari, M. Honda, Masami Ikeda, T. Taniguchi, Y. Ebisawa - Show less +4 more 01 Jun 1983-IEEE Power & Energy Magazine 10 Citations	Not addressed in the paper.
Journal Article•DOI Long front time switching impulse tests of long air gap in UHV projects at altitude of 2100 m Yongli Liao, Chao Gao, Ruihai Li, Guoli Wang, Guoqing Lu - Show less +4 more 16 Jun 2014-IEEE Transactions on Dielectrics and Electrical Insulation 13 Citations	Not addressed in the paper.

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