impedance

Rotating-machine Reactance Multipliers

The momentary or first cycle current is used to evaluate the closing or latching of the high voltage circuit breaker. Other selection criteria are the interrupting and symmetrical short circuit currents. The sub-transient reactance of…


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IEC 60076-5 Transformer Impedances

IEC 60076-5:2000 Power transformers – Part 5: Ability to withstand short circuit recommends a minimum impedance for transformers. Unlike other standards such as the IEEE or AS which recommends typical values, IEC recommends minimum values….


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