EPRO PR6423/001-000+CON021 speed sensor
Zero-Sequence impedance, only winding which star point is brought out can be measured. Measurement is done at principal tapping when the active part of the transformer is installed in the tank. The value of zero-sequence impedance is infinity for the windings which are delta connected or the star point is not brought out. When the other winding of the transformer is delta connected or a delta connected tertiary winding exists, in the measurement of zero-sequence impedance, the star point of the transformer can be loaded up to max. rated current.
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the Uo test voltage will be between 15 % and 27 % of the phase-neutral voltage of the transformer. In cases where counter magnetic flux does not exists e.g. in star -connected transformers which do not have tertiary windings, this test current shall be max. 0,3 x IN to avoid excessive temperature of metallic constructional parts. It can be said that for the transformers which both windings are star connected and which star points are brought out, there are two different zero-sequence impedance’s. a- No-load zero-sequence impedance Z00 When one of the star-connected windings is measured, the terminals of the other winding is left open.
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