scheider electric MiCOM P746 - Settings; Dead Zone Overcurrent Configuration; Non Directional Phase Overcurrent Protection

P746/EN ST/G31 Settings
(ST) 4-
10 MiCOM P746
ST
Setting Range
Menu Text Default Setting
Min. Max.
Step Size
V2> Set 10.00 V 1.000 V 110.0 V 1.000 V
If “V2> Status” is enabled, pickup setting for second stage of overvoltage element.
V2> PickUpTimer 0.000 s 0.000 s 10.00 s 2.000 ms
If “V2> Status” is enabled, sets the minimum pickup for first stage of overvoltage timer.
VN> Status Disabled Disabled / Enabled
To enable (activate) or disable (turn off) the residual voltage check.
VN> Set 10.00 V 1.000 V 80.00 V 1.000 V
If “VN> Status” is enabled, pickup setting for residual voltage element..
VN> PickUpTimer 0.000 s 0.000 s 10.00 s 2.000 ms
If “VN> Status” is enabled, sets the minimum pickup for residual voltage timer.
Ph Comp PU ratio 50% 5% 250% 1%
Phase comparison is used to define the minimum current to be included in the phase
comparison algorithm (see section P746/EN AP).
1.2.3 Dead Zone Overcurrent configuration
Setting Range
Menu Text Default Setting
Min. Max.
Step Size
DEAD ZONE OC
I> Status
I> Status Disabled Disabled / Enabled
To enable (activate) or disable (turn off) the overcurrent check.
I> Current Set 120.0 % 10.00 % 400.0 % 1 %
Pick-up setting for overcurrent element.
I> Time Delay 50.00 ms 0.000 s 100.0 s 10.00 ms
Sets the time-delay for the overcurrent element.
1.2.4 Non directional Phase overcurrent protection
The overcurrent protection included in the P746 relay provides two stages non-directional
three-phase overcurrent protection with independent time delay characteristics. All
overcurrent settings apply to all three phases but are independent for each of the four
stages.
The first stage of overcurrent protection has time-delayed characteristics which are
selectable between inverse definite minimum time (IDMT), or definite time (DT). The second
stage has definite time characteristics only.