Accelerating frequency domain dielectric spectroscopy measurements on insulation of transformers through system identification

• DOI: 10.1049/iet-smt.2017.0253
• Publication Date: 2017-11-07T02:26:51Z
• Authors: Lijun Yang; Junru Chen; Jun Gao; Hanbo Zheng; Yuguan Li
• Keywords: Dielectric response

Frequency domain dielectric spectroscopy (FDS) is a non‐destructive method widely used to evaluate the state of materials. Traditional FDS measurement conducted in frequency sweep mode between 1 kHz and mHz. However, this requires long time when sweeping low frequencies (1 mHz–1 Hz), thereby limiting its field applications. Hammerstein model selected as mathematical for insulation systems according known property established based on system identification theory. An equivalent fitting >97% with obtained. The can be calculate response parameters construct an FDS. proposed 10 min obtain under any excitation low‐frequency section. decreases by up 90% compared that traditional Comparison experiments are applied different systems, such pressboards, testing transformers, power transformers. Results show responses consistent system, ensuring accuracy curve obtained method.