Page 63 - Sace Emax 2 Catalogue

PROTECTION TRIP UNITS 3/39

03
Residual overvoltage (RV – ANSI 59N): with constant trip time (t = k), protects against insulation loss in
2
systems with insulated neutral or with neutral earthed with impedance.
V23 V12
α
α
3 V31 1

Loss of field or reverse reactive power (RQ – ANSI 40 or 32RQ): with constant trip time (t = k), the cir-
Q
cuit breaker tripped when the total reactive power absorbed by the generator exceeds the set thresh-
old. It is possible to select the constant threshold (k=0) or a function of the delivered active power of
P
the generator (k≠0).
TRIP

Reactive overpower (OQ – ANSI 32OF): with constant trip time (t = k), the function is tripped when re-
t
active power exceeds the set threshold in the generator to network direction.
Q27

t27
Q

Active overpower (OP – ANSI 32OF): with constant trip time (t = k), the function is tripped when the ac-
t
tive power exceeds the threshold set in the delivering direction of the generator.
P26

t26
P

Active underpower (UP – ANSI 32LF): with constant trip time (t = k), the function is tripped when the
t
active power delivered by the generator is lower than the set threshold. It is possible to disable the pro-
tection temporarily, to manage the start-up phase, by setting a time window from the closing of the
P23
circuit breaker, by using an electrical signal or via incoming communication to a relay.
t23
P