AC Circuits and Power Systems in Practice by Graeme Vertigan

Author:Graeme Vertigan
Language: eng
Format: epub
ISBN: 9781118924617
Publisher: Wiley
Published: 2017-12-26T00:00:00+00:00

X M represents the inductance through which the magnetising current flows in order to establish the required flux in the core, while RM reflects the associated hysteresis and eddy current losses within the core. The magnetising impedance will depend to a small extent on the magnitude of the applied primary voltage; however, these components generally only have a very small influence on the device errors over the normal range of operating voltages.

In general, the applied burden will be slightly inductive, although in recent years the trend towards electronic energy meters and numerical protection relays has seen many voltage transformers become resistively loaded, and frequently very lightly. Burden range I in Table 8.3 is designed to reflect this. The parallel combination of RB and XB therefore reflects a slightly inductive burden. Except for the special case of zero burden, we find that , so the magnetising impedance can usually be neglected.

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