Title :
A new method for investigating impulse discharge mechanism in the vicinity of minimal breakdown voltage
Author_Institution :
State Sci. Centre of Russia, Moscow, Russia
Abstract :
The author has shown previously that a monochannel develops in transformer oil at the positive voltage pulse tail with an amplitude corresponding to the low gap breakdown probability (about 1-10%). A new method for investigating the impulse discharge mechanism, based on this phenomenon, is proposed. Three stages of discharge development are identified: discharge initiation and discharge zone formation; a stage of separation, movement and flashover of the gap by a monochannel; and monochannel transformation and complete breakdown. The characteristics of discharge development at these different stages are discussed
Keywords :
discharges (electric); electric breakdown; impulse testing; insulation testing; power transformer insulation; power transformer testing; transformer oil; discharge initiation; discharge zone formation; flashover; impulse discharge mechanism; low gap breakdown probability; minimal breakdown voltage; monochannel development; monochannel transformation; positive voltage pulse tail; transformer oil; Breakdown voltage; Dielectric liquids; Electric breakdown; High speed optical techniques; Hydrocarbons; Oil insulation; Petroleum; Pulse transformers; Tail; Transducers;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1996., IEEE 1996 Annual Report of the Conference on
Conference_Location :
Millbrae, CA
Print_ISBN :
0-7803-3580-5
DOI :
10.1109/CEIDP.1996.564691
