UNE-EN 50549-1:2019

This European Standard specifies the technical requirements for the protection functions and the operational capabilities for generating plants, intended to operate in parallel with LV distribution networks.

For practical reasons, this European Standard refers to the relevant distribution system operator where settings have to be defined and/or provided, even when these settings are to be defined and/or provided by another actor e.g. TSO, Member state, regulatory authorities, according to national and European legal framework.

NOTE 1 This includes European network codes and their national implementation, as well as additional national regulations.

NOTE 2 Additional national requirements especially for the connection to the distribution network and the operation of the generating plant may apply.

The requirements of this European Standard apply to all generating plants, generating modules, electrical machinery and electronic equipment, irrespective of the kind of primary energy source and irrespective of the presence of loads in the producer s network that meet all of the following conditions:

" converting any primary energy source into AC electricity;

" connected to a LV distribution network;

" generating modules capacity of Type B or smaller;

" intended to operate in parallel with a distribution network.

If generating modules of different type are combined in one plant, different requirements apply for the different modules based on the type of each module.

NOTE 3 Generating plants connected to a MV distribution network fall into the scope of EN 50549 2.

Unless specified otherwise by the DSO, generating plants connected to a medium voltage distribution network with a maximum apparent power up to 100 kVA can comply with this European Standard as alternative to the requirements of EN 50549-2. A different threshold may be defined by the DSO.

This European Standard defines connection requirements for generating plants to be connected in parallel with distribution networks.

This European Standard recognizes the existence of National Standards, Network Codes, and specific technical requirements of the DSOs and these should be complied with.

Excluded from the scope are:

" the selection and evaluation of the point of connection;

" power system impact assessment;

" connection assessment;

" island operation of generating plants, both intentional and unintentional, where no part of the distribution network is involved;

" four-quadrant rectifier of drives feeding breaking energy back into the distribution network for limited duration with no internal source of primary energy;

" uninterruptible power supply with duration of parallel operation limited to 100 ms;

NOTE 4 Parallel operation due to maintenance of uninterruptible power supply units is not considered.

" requirements for the safety of personnel as they are already 113 adequately covered by existing European Standards.