Deif PPM 300 - 3.5 Busbar AC Protections; Busbar] Under-Voltage (ANSI 27)

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 Page 80 of 521