Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 45
<
Boost - Threshold
≥1
<
&
Set
Reset
>
>
≥1
&
OND
PWM
forcing
U measured
IeMax active
x
1
2
5
3
2
1
+
+
1
4
1
Voltage setpoint: if AUTO, setpoint itself; if PF or VAR, followup used to generate AUTO setpoint
(1.3s delayed voltage measurement)
2
Boost - Delayed OFF3
Boost - Hysteresis4
Boost - Checkbox «Enable PWM forcing»5
15
e
x
2
Boosting is disabled if the “Block boosting in case of of PT alarm” parameter is selected
and any of the following failures is detected.
Failures: a) Partial Loss of UM
b) Loss of UM
Current boost operation is canceled when either failure is detected
Detection of PT failures relies on Supervision functions (status, not latched), PT failures
will only be detected when the DCH SW option is enabled
3.4.2.5 FRT Detection (Fault Ride Through)
FRT detection is a very fast detection of voltage dips as it is defined by grid code
requirements. The output is used to give a fast indication to the governor control in order
to remove active power. This will prevent the generator to trip because of speeding up.
The output is only activated in case the active Power is over the configurable power
threshold.
The reaction time depends on the configured voltage measurement
3-phase measurement 20ms
1-phase measurement 50ms
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