Magnetic Levitation, rail-guns systems and short circuit test on conductor bars are characterized by very high electrical power dissipation and very fast current transient. The present paper deals with a contemporaneous numerical evaluation of current and temperature transients on rectangular conductor. Evaluation has been carried out by means of a time dependent one dimensional finite differences model. The study allowed to determine the relations between current transient characteristics and temperature distribution; in fact, it has been shown that when current is higher than E5 A and current rising time is shorter than E-4 s, a sudden temperature increase occurs which may cause a local fusion of the conductor or, anyway, a degradation of the conductor mechanical properties.
Temperature distribution inside electrical conductors on short circuit condition
ROSSI, Federico
2002
Abstract
Magnetic Levitation, rail-guns systems and short circuit test on conductor bars are characterized by very high electrical power dissipation and very fast current transient. The present paper deals with a contemporaneous numerical evaluation of current and temperature transients on rectangular conductor. Evaluation has been carried out by means of a time dependent one dimensional finite differences model. The study allowed to determine the relations between current transient characteristics and temperature distribution; in fact, it has been shown that when current is higher than E5 A and current rising time is shorter than E-4 s, a sudden temperature increase occurs which may cause a local fusion of the conductor or, anyway, a degradation of the conductor mechanical properties.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
