Subject to modifications and errors
Page 16 of 71
2019-06-26 edition
3.4.1
Voltage monitoring
Line to line
Overvoltage 1
Overvoltage 2
All 3 phase to phase voltages are monitored according to the
set overvoltage thresholds!
After exceeding the switching threshold, the device triggers
after the set trigger delay t
off
.
Can be deactivated in 2-phase (L+N) as well as 4-phase (L1, L2,
L3+N) coupling mode!
Line to line
Undervoltage 1
Undervoltage 2
All 3 phase to phase voltages are monitored according to the
undervoltage thresholds set!
After exceeding the switching threshold, the device triggers
after the set trigger delay t
off
.
Can be deactivated in 2-phase (L+N) as well as 4-phase (L1, L2-
L3+N) coupling mode!
Line to Neutral
Overvoltage 1
Overvoltage 2
All 3 phase-to-neutral voltages are monitored according to the
overvoltage thresholds set!
After exceeding the switching threshold, the device triggers
after the set trigger delay toff.
Exception: In 2-phase (L+N) coupling mode, only one
overvoltage measurement takes place between L1 and N!
Can be deactivated in 3-phase (L1, L2, L3) coupling mode!
Line to Neutral
Undervoltage 1
Undervoltage 2
All 3 phase-to-neutral voltages are monitored according to the
undervoltage thresholds set! After exceeding the switching
threshold, the device triggers after the set trigger delay toff.
Exception: In 2-phase (L+N) coupling mode, only one
overvoltage measurement takes place between L1 and N!
Can be deactivated in 3-phase (L1, L2, L3) coupling mode!
Average
Overvoltage
The 10-minutes average generated is monitored according to
the switching thresholds set for the slow voltage increase
protection!
After exceeding the switching threshold, the device triggers
after the set trigger delay toff.
In 2-phase coupling mode: L-N
In 3-phase coupling mode: L1-L2-L3
In 4-phase coupling mode: L1-N; L2-N; L3-N
3.4.2
Frequency monitoring
Overfrequency 1
Overfrequency 2
Overfrequency 3
Overfrequency 4
The frequency of the 3 phase-to-neutral voltages are
monitored according to the overvoltage thresholds set.
Exception: in 2-wire mode only U L1-N
Underfrequency 1
Underfrequency 2
Underfrequency 3
Underfrequency 4
The frequencies of the 3 phase-to-neutral voltages are
monitored according to the under-frequency thresholds
set.
Exception: in 2-wire mode only U L1-N
Random over frequency
The frequency of the 3 phase-to-neutral voltages are
monitored according to the parameters set (random max.
frequency).
Exception: in 2-wire mode only U L1-N
Frequency monitoring undervoltage LL
Frequency monitoring undervoltage LN
Depending on the mode (2-, 3-, 4-wire,) falling below the
set threshold leads to the deactivation of the frequency
comparators.
RoCoF
The frequency change rates of the 3 phase-to-neutral
voltages are monitored according to the parameters set.
Exception: in 2-wire mode only U L1-N