Chapter 3 - Device Overview
46 3BHS335648 E82 UNITROL 1020 User Manual
- Voltage level to
generate FRT
detection
- Voltage release level
to reset FRT
detection
- Power Threshold to
enable FRT
detection
Low Level [%]
High Level [%]
Power Thr. [%]
[s]
FRT detection = 0 1 0
Voltage drop
High Level
Machine voltage
Excitation ON
100%
t
Low Level
Remark:
If FRT_HighThreshold < FRT_LowThreshold, then the output signal is switched off when
UM > (Low Threshold + 2%)
Therefore, High Level cannot be set below low level
3.4.2.6 Voltage Matching (VM)
Voltage Matching is a function from the Synchronization software (Chapter 3.4.2.7) but
included in the AVR basic software package. When Voltage Matching is activated, the
generator voltage setpoint is adjusted to match U
M
with U
NET
, also during
Synchronization; however there is no Fbias output. More information about Voltage
Matching can be found in Chapter 3.4.2.7 - Synchronization (SYNC).
3.4.2.7 Synchronization (SYNC)
The automatic synchronization of a synchronous machine with the Line is achieved using
the optional integrated synchronizing function. By setting a few simple parameters,
UNITROL 1020 supplies the corresponding control signals for the speed governor and
closes the circuit breaker.
Analog speed correction Fbias is given out from the UNITROL 1020 analog output to the
speed governor control summing point (not as pulse). This signal represents the
difference of network NOMINAL and network ACTUAL frequency. The reference
(setpoint) value for the speed governor must be nominal (50 or 60 Hz) and the Fbias
given by UNITROL 1020 will drive the speed close to actual network frequency.
As an alternative, UNITROL 1020 supports digital increase / decrease signals towards
the governor control.
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