This paper presents the results of the study of the impact on security of On-Load-Tap-Changers (OLTCs) automatic blocking devices installed in the French Riviera subsystem. These devices were installed to prevent voltage collapses : OLTCs are blocked on one area when the specified nodes voltage go under a predetermined level. Usually, such studies relies on few simulations chosen by experts. In the present case, the' study relied on a dynamic datu base, composed of the results of simulation of nearly 1500 randomly defined scenarios (operating point & dynamic model hypotheses & contingencies). The simulation model includes detailled units models (AVR & govemors) and all automatic protections schemes, including the defense plan. Using this data base, several classes of scenarios with different behavior of the OLTC blocking device were identified, the influence of such protection on system security identified and some improvements proposed.
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