Table 3.54
Default parameters
Parameter
Range
Busbar over-voltage 1
Busbar over-voltage 2
Set point
90 to 120 % of nominal voltage
105 %
115 %
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
Trip [Breaker]*
*Note: For the EMERGENCY genset controller: This alarm action trips the tie breaker to the main busbar. For other controllers: The
controller trips the breaker to the equipment it controls.
Table 3.55
Default inhibits
Controller type
Inhibit(s)
GENSET
•
Generator breaker open
EMERGENCY genset
•
Generator breaker open
•
Tie breaker open
•
EDG handling blackout
SHAFT generator
•
Shaft breaker open
SHORE connection
•
Shore breaker open
3.5.2 [Busbar] under-voltage (ANSI 27)
Protection
IEC symbol (IEC60617)
ANSI (IEEE C37.2)
IEC 61850
Operate time
Under-voltage
U<, U<<
27
PTUV
< 50 ms
The alarm response is based on the lowest phase-to-phase voltage, or the lowest phase-to-
neutral voltage, from the busbar, as measured by the controller. For the BUS TIE breaker
controller, these voltages are measured on busbar B.
Set
point
Value
time
Delay
Configure the parameters under
Configure > Parameters > [Busbar] > Voltage protections > Under-voltage #
, where # is 1 or 2.
Table 3.56
Default parameters
Parameter
Range
Busbar under-voltage 1
Busbar 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
Trip [Breaker]*
*Note: For the EMERGENCY genset controller, this alarm action trips the tie breaker to the main busbar. For other controllers: the
controller trips the breaker to the equipment it controls.
DESIGNER'S HANDBOOK 4189340911K UK
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