# Commission Regulation (EU) 2017/2196 of 24 November 2017 establishing a network code on electricity emergency and restoration (Text with EEA relevance), Article 17: Automatic scheme against voltage collapse

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

1. The automatic scheme against voltage collapse of the system defence plan may include one or more of the following schemes, depending on the results of a TSO's assessment of system security:
(a) a scheme for low voltage demand disconnection according to Article 19(2) of Regulation (EU) 2016/1388;
(b) a blocking scheme for on load tap changer according to Article 19(3) of Regulation (EU) 2016/1388; and
(c) system protection schemes for voltage management.
2. Unless the assessment pursuant to paragraph 1 demonstrates that implementing a blocking scheme for on load tap changer is not necessary to prevent a voltage collapse in the TSO control area, the TSO shall establish the conditions under which the on load tap changer shall block according to Article 19(3) of Regulation (EU) 2016/1388, including at least:
(a) the blocking method (local or remote from control room);
(b) the voltage level threshold at the connection point;
(c) the flow direction of reactive power; and
(d) the maximum lapse of time between the detection of the threshold and the blocking.

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Source: https://www.legislation.gov.uk/eur/2017/2196/article/17 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2196/article-17
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.