Title :
Effects of lightning impulse on power transformer insulation level
Author :
Suwanasri, Thanapong ; Homklinkaew, Somchai ; Suwanasri, Cattareeya
Author_Institution :
Sirindhorn Int. Thai - German Grad. Sch. of Eng., King Mongkut´´s Univ. of Technol. North Bangkok, Bangkok, Thailand
Abstract :
The overvoltage stresses due to lightning impulse has been studied by using simulation tool and a typical Thailand subtransmission system. The effect of lightning is considered as back-flashover at the insulator and shielding failure. Then, transmission line, tower, switchgear and transformer are modeled together as a system. The effect of tower footing resistance, underground cable connection between overhead line and switchgear as well as opened circuit breaker on overvoltage stress has been thoroughly investigated. The result is used to determine the insulation level of power transformer and other high voltage equipment in power system.
Keywords :
circuit breakers; flashover; insulators; lightning; overvoltage; poles and towers; power overhead lines; power transformer insulation; power transmission faults; underground cables; Thailand subtransmission system; backflashover; high-voltage equipment; insulator; lightning impulse; lightning impulse effects; opened circuit breaker; overhead line; overvoltage stresses; power system; power transformer insulation level; shielding failure; switchgear; tower footing resistance; transmission line; underground cable connection; Distributed parameter circuits; Lightning; Poles and towers; Power system modeling; Power transformer insulation; Power transformers; Power transmission lines; Stress; Switchgear; Voltage control;
Conference_Titel :
Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, 2009. ECTI-CON 2009. 6th International Conference on
Conference_Location :
Pattaya, Chonburi
Print_ISBN :
978-1-4244-3387-2
Electronic_ISBN :
978-1-4244-3388-9
DOI :
10.1109/ECTICON.2009.5136975
