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

fYear

2009

fDate

6-9 May 2009

Firstpage

100

Lastpage

103

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ECTICON.2009.5136975

Filename

5136975