GE P444 User Manual

Application Notes
P44x/EN AP/Hb
6
MiCOM P40 Agile P442, P444
(AP) 5-
79
Figure 53: logic of the distance protection by zones
Where:
Unblock PS Z1, Z2, Z3, Z4, Zp or Zq: Unblocking of Zone 1 (Z1), Z2, Z3, Z4, Zp or Zq during a
power swing (‘Power swing / Blocking zone’ menu)
0 => Zx blocked during power swing
1 => Zx unblocked during power swing
DDB: Z1 , Z1x , Z2 , Z3 , Z4 , Zp , Zq : Fault detected in zone 1, Z1x, 2, 3, 4, p or q and filtered
by blocking/unblocking Power Swing
The fault detection is modified when the following conditions are met:
• Power swing detection (in this case, power swing detected or unblocking during a
power swing),
• Blocking logic settings during power swing,
• Type of teleprotection scheme.
When zones are blocked during the power swing, those can be unblocked by:
• Start of unblocking logic,
• Unblocking logic enabled for the concerned zone or all zones (setting).

GE P444 Specifications

General

Brand	GE
Model	P444
Category	Protection Device
Language	English