Overvoltages due to switching off an unloaded transformer with a vacuum circuit breaker

Author

Popov, Marjan ; Acha, Enrique

Author_Institution

Univ. St. Cyril & Methodious, Skopje, Macedonia

Volume

14

Issue

4

fYear

1999

fDate

10/1/1999 12:00:00 AM

Firstpage

1317

Lastpage

1326

Abstract

When a vacuum breaker is used to disconnect an unloaded transformer, high overvoltages may result on the secondary side. The phenomena of current chopping and multiple reignitions after contact opening, shortly before current zero, play a significant role in generating these overvoltages, Furthermore, the transient recovery voltage (TRV) is also influenced by virtual current chopping which may lead to fast interruptions and reignitions. The paper reports on a vacuum breaker model implemented in the ATP-EMTP program. Simulations have been performed to determine overvoltages generated by the vacuum breaker, before and after suppression. Network elements were simulated by simplified models of limited complexity

Keywords

overvoltage protection; power system analysis computing; power system protection; power transformers; switching; vacuum circuit breakers; ATP-EMTP; computer simulation; current chopping; disconnection; interruptions; multiple reignitions; secondary side overvoltages; transient recovery voltage; unloaded transformer switching; vacuum circuit breaker; Capacitance; Circuit breakers; Circuit simulation; Furnaces; Large Hadron Collider; Surges; Switchgear; Switching circuits; Vacuum arcs; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.796224

Filename

796224