CHANGES TO THE SF6 OUTFLOW AREA IN THE NOZZLE OF A HIGH VOLTAGE AUTO-PNEUMATIC CIRCUIT BREAKER DURING A SHORT-CIRCUIT CURRENT INTERRUPTION
Journal Title: Proceedings of Electrotechnical Institute Prace Instytutu Elektrotechniki - Year 2016, Vol 63, Issue 273
Abstract
The paper presents a calculation method for the SF6 outflow area across the critical cross-section of the nozzle in an HV puffer circuit breaker during the interruption of a short-circuit current. The presence of an electrical arc can cause clogging of the nozzle at the moment when the arc cross section is close to the nozzle throat area. The clogging depends on the instantaneous current value and can cause ablation of the nozzle material. In the long term it can result in a change in the nozzle dimensions which adversely affects the interrupting ability of the circuit breaker.
Authors and Affiliations
Henryk SIBILSKI, Andrzej DZIERŻYŃSKI, Artur HEJDUK, Janusz KURASZKIEWICZ
Keywords
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- EP ID EP78973
- DOI 10.5604/00326216.1210608
- Views 99
- Downloads 0
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