GE P741

Settings
P74x/EN ST/N
a7
MiCOM P74
1, P742, P743
(ST) 4-
19
ST
1.2.4 Dead Zone configuration (“Dead Zone Prot” menu – P742/P743)
Menu Text Default Setting
Setting Range
Step Size
Min. Max.
Dead Zone Prot
I>DZ Current Set 1.20*I
n
0.05*I
n
4.00*I
n
0.01*I
n
Setting for the tripping characteristic for the minimum pickup phase dead zone element
I>DZ Time Delay 1.00 s 0.00 s 100.00 s 0.01 s
Setting for the minimum pickup phase dead zone element timer
Dead Earth Fault Disabled Enabled / Disabled
Activates or deactivates the neutral dead zone protection. When activated, the following
menus are displayed.
IN>DZ Cur Set 1.20*I
n
0.05*I
n
4.00*I
n
0.01*I
n
Setting for the tripping characteristic for the minimum pickup neutral dead zone element
IN>DZ Time Delay 1.00 s 0.00 s 100.00 s 0.01 s
Setting for the minimum pickup neutral dead zone element timer
Note: I
n
is the CT nominal current.
1.2.5 Non-directional Phase overcurrent protection (“Overcurrent” menu – P742/P743)
The overcurrent protection included in the P742 or P743 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.
Menu Text Default Setting
Setting Range
Step Size
Min. Max.
Overcurrent
I>1 Function
Disabled
Disabled, DT, IEC S Inverse, IEC V Inverse,
IEC E Inverse, UK LT Inverse, IEEE M
Inverse, IEEE V Inv
erse, IEEE E Inverse, US
Inverse, US ST Inverse
Setting for the tripping characteristic for the first stage overcurrent element.
Setting choice: Disabled, definite time (DT), IEC S(tandar) Inverse, IEC V(ery) Inverse,
IEC E(xtremely) Inverse, UK L(ong) T(
ime) Inverse, EUUU Moderately) inverse, IEEE
V(ery) Inverse, IEEE E(xtremely) Inverse, US Inverse or US S(hort) T(ime) Inverse.
The next menus are displayed according to the function choice (refer to P74x/EN GS
section). When Disabled, the next menu is ‘I>2 Function’.
I>1 Current Set 3.00*I
n
0.10* I
n
32.00* I
n
0.01* I
n
Pick-up setting for first stage overcurrent element.
I>1 Time Delay
1.00s 0.00s 100.00s 0.01s
Setting for the time-delay for the definite time setting if selected for first stage element.
I>1 TMS
1.000 0.025 1.200 0.025
Setting for the time multiplier setting to adjust the operating time of the IEC IDMT
characteristic.