# Commission Regulation (EU) 2017/1485 of 2 August 2017 establishing a guideline on electricity transmission system operation (Text with EEA relevance), Article 37: Special protection schemes

Extent: E+W+S+N.I.

Where a TSO uses a special protection scheme, it shall:
(a)ensure that each special protection scheme acts selectively, reliably and effectively;
(b)evaluate, when designing a special protection scheme, the consequences for the transmission system in the event of its incorrect functioning, taking into account the impact on TSOs concerned;
(c)verify that the special protection scheme has a comparable reliability to the protection systems used for the primary protection of transmission system elements;
(d)operate the transmission system with the special protection scheme within the operational security limits determined in accordance with Article 25; and
(e)coordinate special protection scheme functions, activation principles and setpoints with ... affected transmission-connected DSOs, including closed distribution systems and affected transmission-connected SGUs.

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Source: https://www.legislation.gov.uk/eur/2017/1485/article/37 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1485/article-37
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.