The Application of Partial Discharge Monitoring System for Instrument Transformers: Special Issues

The paper describes the results of research and development project, within the framework of which a system of partial discharges monitoring of oil-filled current and voltage transformers was developed and investigated. Physically the monitoring system is based on the electrical method of partial discharges (PD) identification, which presupposes registration of the electrical signals that occur in the PD sensors of the PD registration circuit. Given the suppression of interference, the electrical method is the most sensitive for internal insulation of electrical equipment. The paper also provides an overview of modern PD monitoring approaches and describes the scientific and technical rationale for choosing the most effective PD registration approach. The effectiveness of the considered approaches for solving the problems of high-voltage equipment technical state assessment is also analyzed and reported.