Electric arc-blast nozzle and a circuit breaker including such a nozzle
AssigneeGeneral Electric Technology GmbH
InventorsRoger Ledru, Daniel Vigouroux
Life of this patent
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Abstract
A nozzle with an electric arc-blast having a median part of a first dielectric material and two end parts. The nozzle includes an insert of a second dielectric material, chosen from among: a composite material including a fluorocarbon polymer matrix and inorganic filler A chosen from among a sulfur, a ceramic and an oxide (SiO2, TiO2, Al2CoO4, ZnO, BaTiO3 and P2O5), in a percentage weight ranging between 0.1% and 10%, and/or at least one inorganic filler B (a graphite, a mica, a glass and a fluoride), in a percentage weight ranging between 5% and 50%, and a ceramic material including compound(s) (a carbide, a boride and an oxide).
Claims20
An electric arc-blast nozzle for a circuit breaker comprising:
- a neck-forming median part internally defining an axial passage for cutting an electric arc and formed with a first dielectric material obtained from a first composition comprising a fluorocarbon polymer matrix,
- two end parts extending on either side of the median part which are respectively intended to receive arc contacts that can be axially moved in relation to each other, between a circuit breaker opening position in which the arc contacts are separated from each other and a circuit breaker closing position in which the arc contacts are in contact with each other and in which one of the arc contacts partially closes the axial passage of the median part, an electric arc cut-off gas circulating in the axial passage of the median part to cut the electric arc that is likely to be formed during movement of the arc contacts from the closing position to the opening position of the circuit breaker, and
- an insert, that defines a downstream area of the axial passage of the median part considering a direction of a flow of the electric arc cut-off gas and is, also, formed with a second dielectric material, different from the first dielectric material and from among:
- a composite material obtained from a second composition comprising a fluorocarbon polymer matrix and:
- at least one inorganic filler A comprising at least one of MoS2, Sb2Ss or Sb2S3, a ceramic, BN, and an oxide comprising at least one of Si02, Ti02, AhCoQ4, ZnO, BaTiQ3 and P205, in a percentage weight ranging between 0.1% and 10%, with respect to a total weight of the second composition, and/or
- at least one inorganic filler B comprising at least one of a graphite, a mica, a glass and a fluoride, in a percentage weight ranging between 5% and 50%, with respect to the total weight of the second composition, and
- a ceramic material obtained from a third composition comprising at least one compound comprising at least one of a carbide, a boride and an oxide.
Dependencies are inferred from the claim text.