CHAPTER IISYSTEM DEFENCE PLAN
SECTION 2 Measures of the System Defence Plan
Article 17Automatic scheme against voltage collapse
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.