P54x/EN ST/La4 Settings
(ST) 4-42
MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting
Min. Max.
Step size
V<1 Function DT
Disabled
DT
IDMT
N/A
Tripping characteristic for the first stage undervoltage
The I teristic a t stage is defined by the following f
/ (1 - M)
function.
DMT charac vailable on the firs ormula:
t = K
Where:
K = Time multiplier setting
t = Operating time in seconds
M = Measured voltage/relay setting voltage (V< Voltage Set)
V<1 Voltage Set 80 V 10 V 120 V 1 V
Sets the pick-up setting for first stage undervoltage element.
V<1 Time Delay 10 s 0 s 100 s 0.01 s
Setting for the operating time-delay for the first definite time undervoltag ment. stage e ele
V<1 TMS 1 0.5 100 0.5
Setting for the time multiplier setting to adjust th ting tim e IDMT e opera e of th
characteristic.
V<1 Poledead nh
Enabled Enabled or Disabled N/A
If the cell is enabled, the relevant stage will become inhibited by the pole dead logic. Th
logic produces an output when it detects either an open circuit breaker via au
contacts feeding the relay opto inputs or it detects a combination of both undercurrent and
undervoltage on any one phase. It allows the undervoltage protection to reset when th
circuit breaker opens to cater for line or bus side VT applicatio
is
xiliary
e
ns.
V<2 Status Disabled Enabled or Disabled N/A
Setting to enable or dis he second stage u ltage ele able t ndervo ment.
V<2 Voltage Set 60 V 10 V 120 V 1 V
This setting determines the pick-up setting for second stage undervoltage element.
V<2 Time Delay 5 s 0 s 100 s 0.01 s
Setting for the operating time-delay for the second stage definite time unde
element.
rvoltage
V<2 Poledead nh
Enabled
Enabled
Disabled
N/A
Similar function to V<1 Poledead Inhibit.
OVERVOLTAGE
V> Measur't. Mode
V<1 & V<2 Ph-Ph
V<1 & V<2 Ph-Ph
V<1 & V<2 Ph-N
V<1Ph-Ph V<2Ph-N
V<1Ph-N V<2Ph-Ph
N/A
Sets the combination of measured input voltage that will be used for the overvoltage
elements.
Note: If any stage is disabled, the associated text in the setting menu cell setting will
remain visible but will not affect the operation of the stage that is enabled.
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