Statistical Analysis of DDF and Offline PD Measurements on Stator Windings
Year: 2026
Type: conference-paper
Abstract: Dielectric dissipation factor and offline partial discharge measurements are common tools for assessing the insulation health of assembled stator windings, yet existing IEEE and IEC documents provide no explicit acceptance criteria. As a result, users typically rely on trending values over time and/or comparing results between phases or similar units, leaving the distinction between typical and atypical results unclear. This publication offers a statistical analysis of measurements collected from 289 DDF measurements performed on 124 machines, and 300 offline PD measurements from 80 machines, representing one of the few publicly available large datasets for DDF values and, to date, the only dataset for offline PD measurements. The aim is not to establish pass/fail criteria, but rather to present representative values that help users distinguish typical behaviors from unusual ones and to encourage broader data sharing within the industry.
Authors: Mathieu Lachance, Fabiana Cirino
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7202367446