GE MiCOM P747 Agile User Manual

Symbol Description Units
Vx
An auxiliary supply voltage: Typically the substation battery voltage used to power the relay. V
WI
Weak Infeed logic used in teleprotection schemes.
X
Reactance None
X/R
Primary system reactance/resistance ratio None
Xe/Re
Primary system reactance/resistance ratio for earth loop None
Xt
Transformer reactance (per unit) p.u.
Y
Admittance p.u.
Z
Impedance p.u.
Z0
Zero sequence impedance.
Z1
Positive sequence impedance.
Z1
Zone 1 distance protection.
Z1X
Reach-stepped Zone 1X, for zone extension schemes used with auto-reclosure.
Z2
Negative sequence impedance.
Z2
Zone 2 distance protection.
ZP
Programmable distance zone that can be set forward or reverse looking.
Zs
Used to signify the source impedance behind the relay location.
Φal
Accuracy limit flux Wb
Ψr
Remanent flux Wb
Ψs
Saturation flux Wb
MiCOM P747 Appendix A - Symbols and Glossary
P747-TM-EN-1 419
P747-TM-EN-1.1

GE MiCOM P747 Agile Specifications

General

Brand	GE
Model	MiCOM P747 Agile
Category	Protection Device
Language	English