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ABSTRACT: This paper discusses technical considerations concerning the use
of magnetic-type potential transformers (PT) on a series-compensated
transmission system. Particularly when series capacitors equipped with
metal oxide varistors (MOV) are used, magnetic-type PTs will be subject
to special conditions, one being the presence of very low subsynchronous
voltages due to fault clearing. Other aspects of MOV series compensation
are also discussed. Solutions for obtaining an accurate PT despite these
phenomena are proposed, and the problem of PT characteristics
verification is discussed. These PTs will be used in a shunt-reactor
switching scheme for overall voltage control along the Hydro-Quebec
transmission network
IEEE Transactions on Power Systems 12/1994; · 2.68 Impact Factor
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ABSTRACT: Hydro-Quebec's concerns regarding circuit breaker reliability are presented. Emphasis is placed on two aspects crucial in determining line charging current breaking capacity, i.e., the arc duration and the test circuit configuration. The importance of manufacturing quality for the arcing contacts, nozzles and gasket is discussed. Test criteria at 20 degrees C for simulating breaking tests at -50 degrees C are given. Hydro-Quebec's requirements for testing the tightness of SF/sub 6/ breakers are presented together with a reliable leakage-measuring method.< >
IEEE Transactions on Power Delivery 08/1993; · 1.35 Impact Factor
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ABSTRACT: The loading capability of a 500 kV high-voltage DC (HVDC) transformer bushing is calculated with some unusual conditions: the internal oil circulation in the bushing is blocked at the flange level and the ambient air temperature is raised to 60 degrees C. The theoretical model was verified with a full-scale heat run test on a 7.8 m long bushing. A 220 m/sup 3/ insulated test chamber was required to enclose the test set-up.< >
IEEE Transactions on Power Delivery 08/1993; · 1.35 Impact Factor
