High-frequency recording system for transient processes in 6–110 kV electrical networks

The paper presents the results of development and trial operation of a new system for high-frequency recording of transient processes and abnormal events (faults) in 6-110 kV electrical networks. The recording system is used for monitoring and oscillography of transeint processes at circuit breaker switchings, various single phase-to-ground faults and short circuits, lightning strikes, and so on. Key features of the developed recording system are high sampling rate (up to 50 kHz for 6-10 kV side and up to 10 MHz for 110 kV side) and on-line data transmission. This paper shows and analyzes real oscillograms recorded during trial operation in the 10 kV urban cable network. Perspectives for development and application of high-frequency recording systems are determined including possibility of fault location for medium-voltage power lines.