摘要:
In the method, pairs of pressure and temperature values are recorded using a pressure sensor and a temperature sensor fixed to a case from the outside and communicating with a dielectric gas, thereby enabling a density value to be calculated for the dielectric gas corresponding to each recorded pair of values. Simultaneously with making the pressure and temperature records, an electric current flowing through an electrical apparatus located inside the case and a climate parameter relating to the medium in which the case is located are also recorded for the purpose of giving each density value an index, thereby enabling a leakage rate to be determined with improved accuracy on the basis of indexed leakage rates, each of which is obtained from density values all having the same index.
摘要:
A circuit breaker comprising a first permanent current contact and a first arcing contact that are fixed, a second permanent current contact and a second arcing contact that are movable in a longitudinal direction to be connected with or separated from the fixed contacts, and a mechanism for displacing the moving contacts in the longitudinal direction in such a manner so as to separate the permanent current contacts before separating the arcing contacts. The mechanism includes a shaft movable in the longitudinal direction and secured to the moving permanent current contact, and a crank piece having two limbs forming an L-shape and rotatable about an axis that is fixed relative to the longitudinal direction and that extends perpendicularly to the direction, one limb of the crank piece being connected to the moving arcing contact, and its other limb being connected to the shaft.
摘要:
A gas-blast gas-insulated high-voltage circuit-breaker comprises a fixed main contact, a fixed arc contact and a mobile assembly comprising a main contact, an arc contact and a compression volume cooperating with a fixed piston and communicating with a blast volume leading to a blast nozzle. The compression volume is provided with a valve preventing the gas passing from the blast volume to the compression volume. The piston comprises openings for evacuating the gas from the compression volume during tripping, these openings being closed between the start of compression of the compression volume and the closure of the valve and open upon closure of the valve.
摘要:
A conductor bar for a metal-clad high voltage electrical apparatus, the bar including a metal tubular cylinder of diameter (D) provided at at least one of its ends with a connection flange for connection to an insulator. Between an end and the flange, the bar presents a cylindrical portion of diameter (d) less than (D) and connected to the cylinder via a transition portion formed by a conical annulus. The transition portion is provided with at least one slot forming a current path that extends transversely relative to the bar.
摘要:
For each phase, a metal-clad line comprises a phase conductor surrounded by an aluminum sheath, with each aluminum sheath being surrounded by a sheath which is gas-tight relative to the outside. The inside of said gas-tight sheath(s) is/are filled with a gas having good dielectric properties. The aluminum sheath is made up of two half-shells with each half-shell being formed by a folded strip whose section is in the form of a semicircle terminated at each end by a shoulder and a flat, with the two half-shells being juxtaposed and assembled to each other via their flats. The invention also provides a method of manufacturing the metal-clad line which is particularly applicable to underground metal-clad lines.
摘要:
A high- or medium-tension compressed gas circuit breaker taking circuit-breaking energy from the arc, the circuit breaker being of the type comprising:a fixed assembly including main contacts (8a) and arc contacts (21a);a moving assembly including main contacts (26) and arc contacts (25);a blast volume (VI) including a piston (12) which moves on contact separation and urges compressed gas through a blast nozzle (7) which opens over the zone where a main arc forms when the arc contacts separate, anda set of auxiliary contacts (22a, 21c) in series with the arc contacts for creating an auxiliary arc in the volume (V2) situated behind the piston,the circuit breaker further including means (23, 24) for allowing the auxiliary contacts to separate only when the pressure in the blast zone reaches a predetermined threshold.
摘要:
A compressed gas dielectric circuit breaker comprising fixed main contacts (11), fixed arcing contacts (8A), a moving assembly comprising main contacts (21) and arcing contacts (22A), a blast device comprising a semi-moving cylinder (16) divided into first and second chambers (15, 35) by a fixed piston (3B), with the first chamber (15) communicating with a blast nozzle (12), and a thermal volume (9) opening out into the zone where the fixed arcing contacts (8A) separate from the arcing contacts (22A) of the moving assembly, communication (26) being established between the thermal volume (9) and said second chamber (35) in order to enable gas heated by the arc in the thermal volume to increase in pressure and to assist in the displacement of the cylinder (16) and thus in the compression of the gas in the first chamber (15).
摘要:
A puffer type gas insulated circuit breaker has releasably engaging stationary and movable arc contacts contained in a vessel filled with an arc extinguishing gas. An operation rod serving as a supporting member of the movable arc contacts has openings and helps define a puffer chamber. In the breaker, gas is pressurized by an arc generated between said stationary arc contacts and said movable arc contacts in an initial breaking phase, this gas being taken into the puffer chamber. The holes are used as a heat exhaust passage.
摘要:
The circuit breaker comprises: a stand (1) at ground potential; a first insulating column (2) supported by said stand and filled with a highly dielectric gas; a second insulating column (4) coaxially supported by said first insulating column, said second insulating column serving as a cut-out chamber and including moving contacts (6) connected to a first current terminal (8) and associated with moving contact drive means (3), and fixed contacts (10) connected to a second current terminal (12). Said second column supports a third insulating column (13) which is coaxial with said first and second columns. At least one magnetic circuit and secondary winding (14A-14D) of a current transformer are disposed around said third column in the neighborhood of its connection to said second column. The primary circuit of said current transformer is constituted by a conductor (11) connecting said fixed contacts to said second terminal. An anti-discharge screen (26) is disposed inside said third column level with the transformer and electrically connected to ground via the junction between said second and third columns (15) and via a metal tube (27) which extends from said junction substantially down to ground level and which also serves to house connections (28) between said secondary winding and measuring apparatus.
摘要:
Apparatus for winding and unwinding a flexible rod, said apparatus including a drum (20) on which the rod (9) is wound, said drum being disposed between two parallel plates (32, 33) and being mounted on a shaft (21) set in spherical bearings (24), said shaft (21) forming an angle of two to eight degrees with the perpendicular to the plane of the drum, the periphery of said drum having a groove which defines, with a band (43) surrounding the end surface of the drum, a volume (44) enclosing the rod, said volume having a rectangular cross-section whose small side is slightly larger than the diameter of the rod. The apparatus has application to driving the components of a telescopic disconnector switch.