GE MiCOM P747 Agile User Manual

Symbol Description Units
If
Maximum secondary through-fault current A
If max
Maximum secondary fault current (same for all feeders) A
If max int
Maximum secondary contribution from a feeder to an internal fault A
If Z1
Maximum secondary phase fault current at Zone 1 reach point A
Ife
Maximum secondary through fault earth current A
IfeZ1
Maximum secondary earth fault current at Zone 1 reach point A
Ifn
Maximum prospective secondary earth fault current or 31 x I> setting (whichever is lowest) A
Ifp
Maximum prospective secondary phase fault current or 31 x I> setting (whichever is lowest) A
Im
Mutual current A
IM64
InterMiCOM
64
.
IMx
InterMiCOM
64
bit (x=1 to 16)
In
Current transformer nominal secondary current.
The rated nominal current of the relay: Software selectable as 1 amp or 5 amp to match the line CT input.
A
IN
Neutral current, or residual current: This results from an internal summation of the three measured phase currents. A
IN>
A neutral (residual) overcurrent element: Detects earth/ground faults. A
IN>1
First stage of ground overcurrent protection: Could be labeled 51N-1 in ANSI terminology. A
IN>2
Second stage of ground overcurrent protection: Could be labeled 51N-2 in ANSI terminology. A
Is
Value of stabilizing current A
IS1
Differential current pick-up setting of biased differential element A
IS2
Bias current threshold setting of biased differential element A
ISEF>
Sensitive earth fault overcurrent element. A
Isn
Rated secondary current (I secondary nominal) A
Isp
Stage 2 and 3 setting A
Ist
Motor start up current referred to CT secondary side A
K
Dimensioning factor
K1
Lower bias slope setting of biased differential element %
K2
Higher bias slope setting of biased differential element %
Ke
Dimensioning factor for earth fault
km
Distance in kilometers
Kmax
Maximum dimensioning factor
Krpa
Dimensioning factor for reach point accuracy
Ks
Dimensioning factor dependent upon through fault current
Kssc
Short circuit current coefficient or ALF
Kt
Dimensioning factor dependent upon operating time
kZm
The mutual compensation factor (mutual compensation of distance elements and fault locator for parallel line coupling
effects).
kZN
The residual compensation factor: Ensuring correct reach for ground distance elements.
L
Inductance A
mi
Distance in miles.
N
Indication of "Neutral" involvement in a fault: i.e. a ground (earth) fault.
P1
Used in IEC terminology to identify the primary CT terminal polarity: Replace by a dot when using ANSI standards.
P2
Used in IEC terminology to identify the primary CT terminal polarity: The non-dot terminal.
Pn
Rotating plant rated single phase power W
PN>
Wattmetric earth fault protection: Calculated using residual voltage and current quantities.
MiCOM P747 Appendix A - Symbols and Glossary
P747-TM-EN-1 417
P747-TM-EN-1.1

GE MiCOM P747 Agile Specifications

General

Brand	GE
Model	MiCOM P747 Agile
Category	Protection Device
Language	English