1 Scope
This document is applicable to high-current testing and measurements on both high-voltage and low-voltage equipment. It deals with steady-state and short-time direct current (as e.g. encountered in high-power DC testing), steady-state and short-time alternating current (as e.g. encountered in high-power AC testing), and impulse-current. In general, currents above 100 A are considered in this document, although currents less than this can occur in tests.
NOTE This document also covers fault detection during, for example, lightning impulse testing.
This document:
defines the terms used;
defines parameters and their tolerances;
describes methods to estimate uncertainties of high-current measurements;
states the requirements applicable to a complete measuring system;
describes the methods for approving a measuring system and checking its components;
describes the procedure by which the user shows that a measuring system meets the requirements of this document, including limits set for uncertainty of measurement.