Areva MiCOM P441, Technical Manual

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P44x/EN TD/E33 Technical Data
Page 22/30 MiCOM P441/P442 & P444
IEEE/US IDMT Curve description Standard tr Constant
α
Constant
Moderately Inverse IEEE 0.0515 0.02
Very Inverse IEEE 19.61 2
Extremely Inverse IEEE 28.2 2
Inverse US-C08 5.95 2
Short Time Inverse US-C02 0.02394 0.02
Inverse Reset Characteristics
6.4 Negative sequence overcurrent protection
Setting Range Step size
I2> Current Set
0.08 - 4.0
In
0.01
In
I2> time Delay 0 - 100s 0.01s
Directional None/Fwd/Rev
I2> Char Angle –95° - +95° 1°
6.5 Broken Conductor Protection
Settings Range Step size
I2/I1 Setting 0.2 - 1.0 0.01
I2/I1 Time Delay 0 - 100s 0.1s
I2/I1 Trip Enabled / Disabled
6.6 Earth Fault Overcurrent Protection
6.6.1 Threshold Settings
Setting Range Step Size
IN>1 Current Set
0.08 - 4.0
In
0.01
In
IN>2 Current Set
0.08 - 32
In
0.01
In
6.6.2 Polarising Quantities For Earth Fault Measuring Elements
The polarising quantity for earth fault elements can be either zero sequence or negative
sequence values.
Setting Range Step Size
IN> Char angle
–95
°
to +95
°
1
°
6.6.3 Time Delay Characteristics
The time delay options for the two earth fault elements are identical, stage 1 may be
selected to be either IDMT or definite time. Stage 2 will provide a definite time delay. The
settings and IDMT characteristics are identical to those specified for the phase overcurrent
elements. The setting range for the definite time delayed element is as specified below:
Definite Time Characteristic
Element Range Step Size
All stages 0 to 200s 0.01s