General presentation
Instrument transformers - General information. Theory. How it works
Article REF: D4720 V1
General presentation
Instrument transformers - General information. Theory. How it works

Author : Jean-Pierre DUPRAZ

Publication date: December 10, 1990 | Lire en français

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1. General presentation

1.1 Role of instrument transformers

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1.1.1 Electrical environment of high-voltage substations

High-voltage (HV) substations are the site of exceptional electrical and electromagnetic disturbances, due in particular to equipment switching. The lines are exposed to atmospheric discharges, and transmit rapid surges corresponding to the equipment coupled to them.

As a result, very high amplitudes of interference (several kiloamperes, several hundred kilovolts) are superimposed on the nominal current...

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