WG 1

Harmonics and other low-frequency disturbances

a) To define limits of permissible harmonic and interharmonic
currents produced by individual pieces of equipment for direct
connection to supply systems networks and not submitted to
approval by or notification to the supply authorities for their
connection.


b) To define or give guidance with regard to permissible
harmonic and interharmonic currents produced by other pieces of
equipment for connection to power supply systems, particularly
those submitted to approval by or notification to supply
authorities for their connection.


c) To define the method of measurements and calculation as
required.


d) To liaise with SC 77A/WG 8 or with international bodies with
regard to typical environmental voltage levels and compatibility (or maximum acceptable) voltage levels.


e) To liaise with SC 77A/WG 6 with regard to test procedures.


f) To liaise with TC 77/WG 1 for terminology matters.


Note 1.- Case a) Concerns mainly pieces of equipment of relatively small power installed or used in mass in the low-voltage network.

Case b) Concerns mainly individual pieces of equipment with
relatively high power.


Note 2.- In both cases a) and b) the conditions of use, the summation effects and the propagation through the supply networks (modelling of the network) should be taken into consideration.