Title :
Transients during 138 kV SF6 breakers switching of low inductive currents
Author :
Elkins, D.L. ; Jain, A.C. ; McDermott, T.E. ; Rees, V.
Author_Institution :
Exxon Chem. Co., Baytown, TX, USA
Abstract :
The effects of switching low inductive currents with 138 kV SF6 breakers in a petrochemical plant are discussed. Switching transients are believed to have contributed to the failure of a 13.8 kV PT and a 13.8 kV air magnetic circuit breaker. The high-frequency transient surge can transfer across a transformer due to transformer capacitances between the high and low-voltage windings. The electromagnetic transient program system model and different case studies are discussed with the effect of different transformer winding capacitances. The interruption mechanism of low inductive currents is described. This analysis demonstrates the need to conduct switching transient studies and the need for surge arresters on transformer secondary terminals under certain system conditions
Keywords :
capacitance; chemical industry; circuit breakers; gaseous insulation; petroleum industry; power transformers; sulphur compounds; surges; switching; transformer windings; transients; 138 kV; SF6 circuit breakers; air magnetic circuit breaker; electromagnetic transient program system model; high-frequency transient surge; low inductive currents; low-voltage windings; petrochemical plant; surge arresters; switching transients; transformer capacitances; transformer winding; Capacitance; EMTP; Electromagnetic modeling; Electromagnetic transients; Magnetic circuits; Magnetic switching; Petrochemicals; Surges; Switching circuits; Windings;
Conference_Titel :
Petroleum and Chemical Industry Conference, 1991, Record of Conference Papers., Industry Applications Society 38th Annual
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-0193-5
DOI :
10.1109/PCICON.1991.162930
