Title :
Propagation of PD pulses through ring-main-units and substations
Author :
Wagenaars, Paul ; Wouters, Peter A A F ; Van Der Wielen, Peter C J M ; Steennis, E. Fred
Author_Institution :
Eindhoven Univ. of Technol., Eindhoven, Netherlands
Abstract :
Online partial discharge (PD) monitoring systems are traditionally installed at a single mediumvoltage (MV) cable connection between two ring-main-units (RMUs). It is more efficient to monitor two or more consecutive cables using a single monitoring system. Moreover, practical experience with the PD-OL system, shows that for substations, with many parallel MV cables, and RMUs installing the inductive sensor may be hampered or even impossible. In this paper the influence of RMUs and substations on the propagation of PDs is studied. An RMU or substation can be modeled as a combination of complex impedances representing switchgear, transformer and MV cables. A PD pulse from a cable encounters a load impedance that does not match the cable´s characteristic impedance, resulting in partial reflection and partial transmission transmission to other cables. Models for RMUs and substations are proposed and verified by measurements. Feasible options for online PD monitoring through RMUs or substations are determined.
Keywords :
partial discharges; power cables; substations; inductive sensor; load impedance; medium-voltage cable connection; online partial discharge monitoring system; parallel MV cable; partial reflection; ring-main-unit; substation; switchgear; transformer; Impedance; Inductance; Measurement units; Monitoring; Partial discharges; Power cables; Pulse transformers; Sensor systems; Substations; Switchgear; diagnostics; modeling; partial discharges; power cables; ring-main-units; substations;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2009. ICPADM 2009. IEEE 9th International Conference on the
Conference_Location :
Harbin
Print_ISBN :
978-1-4244-4367-3
Electronic_ISBN :
978-1-4244-4368-0
DOI :
10.1109/ICPADM.2009.5252394
