Residual Overvoltage (Neutral Displacement) Protection ("Residual Overvoltage" Menu) - GE MiCOM P40 Agile Technical Manual

P44x/EN ST/Hb6
(ST) 4-32
Menu text
characteristic.
Thermal Alarm
An alarm can be raised on reaching a thermal state corresponding to a percentage of the
trip threshold. A typical setting might be 'Thermal Trip' = 70% of thermal capacity.
Time Constant 1
Setting for the thermal time constant (τ1) for a single time constant characteristic, or the first
time constant for the dual time constant characteristic.
Time Constant 2
Setting for the second time constant (τ2) for the dual time constant characteristic.
2.11 Residual overvoltage (neutral displacement) protection ("Residual overvoltage"
menu)
Menu text
GROUP 1 – RESIDUAL OVER-VOLTAGE
VN Type
Select residual or homopolar voltage.
VN>1 Function
Select the residual overvoltage stage 1 as either Inverse Definite Minimum Time (IDMT),
Definite Time (DT) or disabled. The following submenus are visible according to this setting.
VN>1 Voltage Set
residual:
homopolar (C7.x):
Pick-up setting for the first stage residual overvoltage characteristic.
VN>1 Time Delay
Operating time delay setting for the first stage definite time residual overvoltage element.
VN>1 TMS
Setting for the Time Multiplier Setting to adjust the operating time of the IDMT characteristic.
where K = Time Multiplier Setting (TMS), K = Operating time (in second) and M = measured
voltage / relay setting voltage (V<).
VN>1 tReset
Setting to determine the reset/release definite time for the first stage characteristic.
VN>2 Status
Setting to enable or disable the second stage definite time residual overvoltage element.
VN>2 Voltage Set
residual:
homopolar (C7.x):
Pick-up setting for the second stage residual overvoltage element.
VN>2 Time Delay
Operating time delay setting for the second stage residual overvoltage element.
Default setting
70%
10 mn
5 mn
Default setting
Residual Residual, Homopolar
DT Disabled, DT, IDMT
5 V 1 V
1.5 V 0.5 V
5.00 s 0 s
1.0 0.5
0 s 0 s
Disabled Enabled, Disabled
10 V 1 V
3 V 0.5 V
10.00 s 0 s
MiCOM P40 Agile P442, P444
Setting range
Min Max
50% 100%
1 mn 200 mn
1 mn 200 mn
Setting range
Min Max
80 V or 180V
60 V
100.0 s
100.0
100.0 s
80 V or 180V
60 V
100.0 s
Setting
Step size
1%
1 mn
1 mn
Step size
∗
1 V
0.5 V
0.01 s
0.5
0.5 s
∗
1 V
0.5 V
0.01 s