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IEC/TS 61000-3-4

1st Edition, October 1, 1998

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Electromagnetic Compatibility (EMC) - Part 3-4: Limits - Limitation of Emission of Harmonic Currents in Low-Voltage Power Supply Systems for Equipment with Rated Current Greater Than 16 A

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Description / Abstract:

This part of IEC 61000 deals with the emission of disturbances due to harmonics.

The recommendations of this technical report are applicable to electrical and electronic equipment with a rated input current exceeding 16 A per phase and intended to be connected to public low-voltage a.c. distribution systems of the following types:

 – nominal voltage up to 240 V, single-phase, two or three wires;

 – nominal voltage up to 600 V, three-phase, three or four wires;

 – nominal frequency 50 Hz or 60 Hz.

Other distribution systems are excluded.

Tests according to this report are type tests of complete pieces of equipment, for example a speed variable fan, and not of components, for example a converter.

Connection of this equipment to the supply generally requires special agreement between the supply authority and the consumer. This consent will depend upon several factors including the expected levels of disturbance caused by the equipment and the actual situation at the connection point to the power supply system.

These recommendations specify the information required to enable a supply authority to assess equipment regarding harmonic disturbance and to decide whether or not the equipment is acceptable for connection with regard to the harmonic distortion aspect.

NOTE 1 – For these types of equipment only general recommendations on assessment of disturbances can be given. There is no guarantee that the connection of equipment complying with these recommendations will be allowed in all cases, as the consent to connect equipment to the supply depends on the level of disturbance caused by the equipment and the load conditions in the network.

NOTE 2 – These recommendations can also be applied to equipment with a lower rated input current but requiring special consent of the supply authority (see IEC 61000-3-2).

NOTE 3 – These recommendations are not applicable to active filters.

Guidance is given on:

a) required short-circuit power for harmonics emitting equipment tested or simulated under specified conditions;

b) methods for type tests or simulations.