Transients during 138-kV SF6 breaker switching of low inductive currents

• Published in: IEEE transactions on industry applications Vol. 29; no. 4; pp. 721 - 727
• Main Authors: Elkins, D.I., Jain, A.C., McDermott, T.E., Rees, V.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-07-1993; Institute of Electrical and Electronics Engineers
• Subjects: 240200 - Power System Networks, Transmission & Distribution- (1990-); 320303 - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Equipment & Processes; Applied sciences; Capacitance; CHEMICAL PLANTS; CIRCUIT BREAKERS; Connection and protection apparatus; ELECTRIC POTENTIAL; Electrical engineering. Electrical power engineering; ELECTRICAL EQUIPMENT; ELECTRICAL TRANSIENTS; Electromagnetic modeling; Electromagnetic transients; ELECTRONIC CIRCUITS; EMTP; ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; EQUIPMENT PROTECTION DEVICES; Exact sciences and technology; INDUSTRIAL PLANTS; Magnetic circuits; Magnetic switching; MATHEMATICAL MODELS; OPERATION; PETROCHEMICAL PLANTS; Petrochemicals; POWER TRANSMISSION AND DISTRIBUTION; Sulfur hexafluoride; Surges; SWITCHING CIRCUITS; TRANSFORMERS; TRANSIENTS; VOLTAGE DROP; Switchgear; High voltage; Switching conditions; Protection by lightning arrester; Sulfur hexafluoride; Inductive load; Electric device; Transients
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/28.231985

The authors discusses the effects of switching low inductive currents with 138 kV SF/sub 6/ breakers in a petrochemical plant. 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 (ETPS) model and different case studies are discussed with the effect of different transformer winding capacitances. The interruption mechanism of low inductive currents is also 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.< >