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Title: Transient voltage oscillations in coils

Magnet coils may be excited into internal voltage oscillations by transient voltages. Such oscillations may electrically stress the magnet's dielectric components to many times its normal stress. This may precipitate a dielectric failure, and the attendant prolonged loss of service and costly repair work. Therefore, it is important to know the natural frequencies of oscillations of a magnet during the design stage, and to determine whether the expected switching transient voltages can excite the magnet into high-voltage internal oscillations. The series capacitance of a winding significantly affects its natural frequencies. However, the series capacitance is difficult to calculate, because it may comprise complex capacitance network, consisting of intra- and inter-coil turn-to-turn capacitances of the coil sections. A method of calculating the series capacitance of a winding is proposed. This method is rigorous but simple to execute. The time-varying transient voltages along the winding are also calculated.
Authors:
Publication Date:
OSTI Identifier:
5915527
Report Number(s):
LA-UR-85-397; CONF-850310-11
ON: DE85006715
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 6. topical meeting on the technology of fusion energy, San Francisco, CA, USA, 3 Mar 1985
Research Org:
Los Alamos National Lab., NM (USA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MAGNET COILS; OSCILLATIONS; ELECTRIC POTENTIAL; ELECTRICAL INSULATION; FAILURES; TRANSIENTS; ELECTRIC COILS; ELECTRICAL EQUIPMENT; EQUIPMENT 700202* -- Fusion Power Plant Technology-- Magnet Coils & Fields