3.4.3 [Source] under-voltage (ANSI 27)
Protection
IEC symbol (IEC60617)
ANSI (IEEE C37.2)
IEC 61850
Operate time
Under-voltage
U<, U<<
27
PTUV
< 100 ms
The alarm response is based on the lowest phase-to-phase voltage, or the lowest phase-to-
neutral voltage, from the source, as measured by the controller. The phase-to-phase voltage is
the default.
Set
point
Value
time
Delay
Configure the parameters under
Configure > Parameters > [Source] > Voltage protections > Under-voltage #
, where # is 1 or 2.
Table 3.29
Default parameters
Parameter
Range
Under-voltage 1
Under-voltage 2
Set point
50 to 100 % of nominal voltage
95 %
80 %
Delay
0.00 s to 1 h
5.00 s
3.00 s
Enable
Not enabled, Enabled
Enabled
Enabled
Latch
Not enabled, Enabled
Not enabled
Enabled
Action
Warning
Block
Table 3.30
Default inhibits
Controller type
Inhibit(s)
GENSET
•
Generator breaker closed
•
Engine not running
EMERGENCY genset
•
Engine not running
•
EDG in parallel
•
EDG handling blackout
SHAFT generator
•
Shaft breaker closed
•
Shaft generator not running
SHORE connection
•
Shore breaker closed
3.4.4 [Source] voltage unbalance (ANSI 47)
Protection
IEC symbol (IEC60617)
ANSI (IEEE C37.2)
IEC 61850
Operate time
Voltage unbalance (voltage asymmetry)
UUB>
47
-
< 200 ms*
*Note: This operate time includes the minimum user-defined delay of 100 ms.
DESIGNER'S HANDBOOK 4189340911K UK
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