Overvoltage Protection - GE MiCOM P40 Agile Technical Manual

P44x/EN ST/Hb6
(ST) 4-34
Menu text
GROUP 1 – VOLT Protection
UNDER VOLTAGE
V< Measur't Mode
Select the undervoltage protection to operate from a phase to phase voltage or phase to
earth measurement.
V<1 Function
Select the first undervoltage threshold as either Inverse Definite Minimum Time (IDMT),
Definite Time (DT) or disabled. The three following submenus (Voltage, time delay and time
multiplier setting) are visible according to this setting.
V<1 Voltage Set
Sets the pick-up setting for first stage undervoltage element.
V<1 Time Delay
Setting for the operating time-delay for the first stage definite time undervoltage element.
V<1 TMS
The following formula defines the IDMT characteristics: t = K / (1 – M),
where K = Time Multiplier Setting (TMS), K = Operating time (in second) and M = measured
voltage / relay setting voltage (V<).
V<2 Status
Enable or disable the second undervoltage threshold. The voltage and time-delay (following
submenus) are settable when V<2 status is enabled. Stage 2 is DT only.
V<2 Voltage Set
V<2 Time Delay
V<3 Status
Enable or disable 3
submenus) are settable when V<3 status is enabled. Stage 3 is DT only.
V<3 Voltage Set
V<3 Time Delay
V<4 Status
Enable or disable 4
submenus) are settable when V<4 status is enabled. Stage 4 is DT only.
V<4 Voltage Set
V<4 Time Delay
2.13.2

Overvoltage protection

The following table shows the overvoltage section of this menu along with the available
setting ranges and factory defaults. As can be seen, the setting cells for the overvoltage
protection are identical to those previously described for the undervoltage protection.
Default setting
Phase-Neutral
DT
50 V
10 s
1
Disabled
38 V
5 s
Disabled
rd
undervoltage threshold. The voltage and time-delay (following
30 V
1 s
Disabled
th
undervoltage threshold. The voltage and time-delay (following
25 V
1 s
MiCOM P40 Agile P442, P444
Setting range
Min Max
Phase-phase, Phase-neutral
Disabled, DT, IDMT
10 V 120 V
0 s 100 s
0.5 100
Disabled, Enabled
10 V 120 V
0 s 100 s
Disabled, Enabled
10 V 120 V
0 s 100 s
Disabled, Enabled
10 V 120 V
0 s 100 s
Setting
Step size
1 V
0.01 s
0.5
1 V
0.01 s
1 V
0.01 s
1 V
0.01 s