European Committee for Electrotechnical Standardization

High-current test techniques - Definitions and requirements for test currents and measuring systems
 N EN 62475

Annotation

This International Standard 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 d.c. testing), steady-state and short-time alternating current (as e.g. encountered in high-power a.c. testing), and impulse-current. In general, currents above 100 A are considered in this International Standard, although currents less than this can occur in tests.

NOTE This standard also covers fault detection during, for example, lightning impulse testing.

This standard:

• defines the terms used;

• defines parameters and their tolerances;

• describes methods to estimate uncertainties of high-current measurements;

• states the requirements which a complete measuring system shall meet;

• describes the methods for approving a measuring system and checking its components;

• describes the procedure by which the user shall show that a measuring system meets the requirements of this standard, including limits set for uncertainty of measurement.

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