CHAPTER VICOMPLIANCE AND REVIEW

SECTION 2Compliance testing and review of system defence plans and restoration plans

Article 50Compliance testing and periodic review of the system defence plan

1

Each DSO concerned by the implementation of the low frequency demand disconnection on its installations shall update once a year the communication to the notifying system operator provided for in point (b) of Article 12(6). This communication shall include the frequency settings at which netted demand disconnection is initiated and the percentage of netted demand disconnected at every such setting.

2

Each TSO shall monitor the proper implementation of the low frequency demand disconnection on the basis of the yearly written communication referred to in paragraph 1 and on the basis of implementation details of TSOs' installations where applicable.

3

Each TSO shall review, at least every five years, its complete system defence plan to assess its effectiveness. The TSO shall in this review take into account at least:

a

the development and evolution of its network since the last review or first design;

b

the capabilities of new equipment installed on the transmission and distribution systems since the last review or first design;

c

the SGUs commissioned since the last review or first design, their capabilities and relevant services offered;

d

the tests carried out and the analysis of system incidents pursuant to Article 56(5) of Regulation (EU) 2017/1485; and

e

the operational data collected during normal operation and after disturbance.

4

Each TSO shall review the relevant measures of its system defence plan in accordance with paragraph 3 before any substantial change in the configuration of the grid.

5

When the TSO identifies the need to adapt the system defence plan, it shall amend its system defence plan and implement these amendments in accordance with points (c) and (d) of Article 4(2) and Articles 11 and 12.