Areva MiCOM P125, Technical Manual

Page: 181 / 362

Technical Data P12y/EN TD/D32
MiCOM P125/P126 & P127 Page 13/28
Setting Range
[67N] Earth OC Min Max Step
Ue>>> 1 V 260 V 0.1 V
Input residual voltage with range from 220 to 480V
Ue>>> 4 V 960 V 0.5 V
ATTENTION:
THE Ue THRESHOLD SETTINGS DEPEND ON THE ADOPTED
CONNECTION OPTION. IN CONFIGURATION/GENERAL OPTIONS
MENU OF THE P127 RELAY THE Ve INPUT CAN BE SET DIRECTLY
FROM A VT (I.E. FROM A DELTA VT) OR CAN BE DERIVED FROM THE
MEASUREMENT OF THE THREE PHASE TO NEUTRAL VOLTAGES
(3VPN). IN THIS CASE THE Ue IS CALCULATED AS:
) UC UB UA ( x
3
1
Ue
+ + =
THE SETTING OF THE Ue THRESHOLDS MUST TAKE THE ABOVE
FORMULA IN ACCOUNT.
8.4 Earth Wattmetric Protection
−
Earth fault current Fundamental only
−
Residual voltage Fundamental only
−
Minimum Operating Voltage
•
Range from 57 to 130V 0.7 V
•
Range from 220 to 480V 3.0 V
−
Minimum Operating Current with Ien=1A and Ien=5A
•
Range from 0.002 to 1 Ien 1 mA
•
Range from 0.01 to 8 Ien 5 mA
•
Range from 0.1 to 40 Ien 50 mA
NOTE : When Pe> or Iecos> is associated to an IDMT curve, the maximum
setting recommended should be the maximum of the range divided by
20.