N-1 Criterion
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Contents
Definitions
European Definitions
ENTSO-E
(N-1)-Criterion: The rule according to which elements remaining in operation within TSO’s Responsibility Area after a Contingency from the Contingency List must be capable of accommodating the new operational situation without violating Operational Security Limits. [1]
National Definitions
Netherlands
(n-1)-criterium: Bij volledig in bedrijf zijnd net moeten de door de aangeslotenen gewenste leveringen dan wel afnamen kunnen worden gerealiseerd onder handhaving van de enkelvoudige storingsreserve. Bij een enkelvoudige storing is een onderbreking van maximaal 10 minuten met een maximale belasting van 100 MW toegestaan. [2]
New Zealand
(N-‘k’) criterion denotes that the system is planned such that with all transmission facilities in service the system is in a secure state and for any ‘k’ credible contingency event(s) the system moves to a satisfactory state. If any further contingency events were to occur loads may have to be shed to return to a satisfactory state. [3]
The single contingencies to be considered under an N-1 criterion are:
- loss of a single transmission circuit
- loss of a single generator
- loss of an HVDC pole
- loss of a single bus section
- loss of an interconnecting transformer
- loss of a single shunt connected reactive component, e.g. capacitor bank, SVC
Philippines
N-1 Criterion specifies that the Grid shall continue to operate in the Normal State following the loss of one Generating Unit, transmission line, or transformer. [4]
Switzerland
(n-1)-Kriterium: Bezeichnet ein Prinzip, dessen Einhaltung den sicheren Netzbetrieb auch dann gewährleistet, wenn ein beliebiges einzelnes Element des Systems ausgefallen ist. [5]
