1. Measurement and Mathematical Fitting of Partial Discharge Pulse Burst in Transformer Oils.
- Author
-
Junhao Li, Quanwei Hu, Wenrong Si, and Yanming Li
- Subjects
INSULATING oils ,ELECTRIC transformers ,ELECTRIC discharges ,ELECTRIC potential ,ELECTRICAL engineering ,MATHEMATICAL models - Abstract
Partial discharge (PD) detection is a technique widely used for high voltage equipment insulation condition assessment. In such applications, an understanding of PD mechanisms, characteristics and development processes is important. In this paper, PD characteristics of transformer oils are examined under AC conditions, using a needle-to-plane electrode system. The PD activity in transformer oil is confirmed as appearing in pulse burst form. The duration time of PD pulse bursts was found to decrease with voltage above the PD inception voltage; this decrease was accompanied by both an increase in number of discrete PD pulses and their average maximum amplitude within the pulse burst itself. In order to obtain the increase principle of pulse amplitude within PD pulse burst, mathematical fitting models for discrete pulse current peak value within PD burst are established using exponential express and validity of mathematical models is proved by fitting error. [ABSTRACT FROM AUTHOR]
- Published
- 2011