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
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. [2]
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. [3]
Switzerland
(n-1)-Kriterium: Bezeichnet ein Prinzip, dessen Einhaltung den sicheren Netzbetrieb auch dann gewährleistet, wenn ein beliebiges einzelnes Element des Systems ausgefallen ist. [4]
