Alstom MiCOM P546 - 1.33.1 Compensated overvoltage

Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546 (OP) 5-91
OP
(IDMT/DT)
&
P1637ENd
&
&
A Phase Start
C Phase Trip
C Phase Start
B Phase Trip
B Phase Start
A Phase Trip
VA> / VAB>
VC> / VCA>
(IDMT/DT)
(IDMT/DT)
VB> / VBC>
Overvoltage
Timer Block
(Single Stage)
&
&
&
&
Setting: V>operate mode/Any Phase
Setting: V>operate mode/3 Phase
DDB 691 or
DDB 695
DDB 692 or
DDB 693 or
DDB 694 or
DDB 696 or
DDB 697 or
DDB 698
Figure 63 Overvoltage - single and three phase tripping mode (single stage)
Note: Phase overvoltage protection is phase segregated, but the operation
of any phase is mapped to 3 phase tripping in the default PSL.
Each stage of Overvoltage protection may be disabled by a DDB (473 or 474) Inhibit Vx>
(x = 1, 2).
1.33.1 Compensated overvoltage
The Co
mpensated Overvoltage function calculates the positive sequence voltage at the
remote terminal using the positive sequence local current and voltage and the line
impedance and susceptance. This can be used on long transmission lines where Ferranti
Overvoltages can develop under remote circuit breaker open conditions.
The Compensated overvoltage protection function can be found in the relay menu Volt
Protection. The line impedance settings together with the line charging admittance in relay
menu Line Parameters is used to calculate the remote voltage.