In the electrified metro-transit system of Rome, on the 20 kV bus-bar of the terminal electrical substations (ESS), some Instrument Voltage Transformers (IVTs) are installed. In this system, for all the terminal ESS, several cases of IVT faults have been detected; only a little number of IVTs are survived and the Company operating the system (Met.Ro. S.p.A.) required a laboratory survey to know their faults cause. At the same time a power quality (PQ) monitoring activity has been performed on the system: some significant overvoltages, associated to the SF6 switches operations, with a very fast front but with values out of the typical range, have been recorded. To point out a possible correlation between faults and overvoltages, a measurement campaign on IVTs has been performed in laboratory and, in order to verify their impact on overvoltages measurements and the cause of their failure, a comparison with an other type of IVT has been carried out. The present paper reports the preliminary results of tests and measurements .
PQ Measurement on an IVT in an Electrified Metro-Transit System / Falvo, Maria Carmen; Grasselli, Umberto; Lamedica, Regina; Lampasi, Domenico Alessandro; G., Maranzano; Podesta', Luca. - STAMPA. - (2006). (Intervento presentato al convegno IEEE ICHQP 2006 - - International Conference on Harmonics in Power Systems, 2006 tenutosi a Cascais - PORTOGALLO nel 1-5 Ottobre 2006).
PQ Measurement on an IVT in an Electrified Metro-Transit System
FALVO, Maria Carmen;GRASSELLI, Umberto;LAMEDICA, Regina;LAMPASI, Domenico Alessandro;PODESTA', Luca
2006
Abstract
In the electrified metro-transit system of Rome, on the 20 kV bus-bar of the terminal electrical substations (ESS), some Instrument Voltage Transformers (IVTs) are installed. In this system, for all the terminal ESS, several cases of IVT faults have been detected; only a little number of IVTs are survived and the Company operating the system (Met.Ro. S.p.A.) required a laboratory survey to know their faults cause. At the same time a power quality (PQ) monitoring activity has been performed on the system: some significant overvoltages, associated to the SF6 switches operations, with a very fast front but with values out of the typical range, have been recorded. To point out a possible correlation between faults and overvoltages, a measurement campaign on IVTs has been performed in laboratory and, in order to verify their impact on overvoltages measurements and the cause of their failure, a comparison with an other type of IVT has been carried out. The present paper reports the preliminary results of tests and measurements .I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
