REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-199
Frequency
Setting of the absolute frequency enabling criterion.
Operation for overfrequency or underfrequency is determined
by the absolute frequency setting:
· Underfrequency for frequency settings < f
N
· Overfrequency for frequency settings > f
N
The absolute frequency criterion is disabled for a setting of
‘Frequency’ = 0
. In this case, tripping is dependent solely on
the rate-of-change setting df/dt.
Inadmissible settings:
· Frequency = f
N
· Frequency < f
N
– 10 Hz
· Frequency > f
N
+ 5 Hz.
BlockVoltage
Pick-up setting for undervoltage blocking (reset ratio approx.
1.05, reset time approx. 0.1 s).
Delay
Delay from the instant the function picks up to the generation
of a tripping command.
VoltageInp
defines the voltage input channel. All voltage inputs may be
selected with the exception of the special voltage inputs for
the 100% ground stator fault protection.
Blocked (U<)
signals when the function is blocked by the undervoltage
criterion.
BlockInp
defines the input for an external blocking signal.
F: - enabled
T: - disabled
xx: - all binary inputs (or outputs of protection
functions).
Trip
Output for signalling tripping.
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