ZA
ZB
Zload
R
X
en07000016.vsd
IEC07000016 V1 EN-US
Figure 251: Simplified figure to derive StartAngle
0
0
32
52
arctan
arctan
arctan
+ arctan
= 21.8 + 33.0 55
80
80
³
=
»
ZB
ZA
angleStart
+
Zload
Zload
EQUATION1968 V2 EN-US
(Equation 457)
In case of minor damped oscillations at normal operation we do not want the protection to
start. Therefore we set the start angle with large margin.
Set
StartAngle to 110°
For the
TripAngle it is recommended to set this parameter to 90° to assure limited stress for
the circuit breaker.
In a power system it is desirable to split the system into predefined parts in case of pole slip.
The protection is therefore situated at lines where this predefined split shall take place.
Normally the
N1Limit is set to 1 so that the line will be tripped at the first pole slip.
If the line shall be tripped at all pole slip situations also the parameter
N2Limit is set to 1. In
other cases a larger number is recommended.
7.16.3.2
Setting example for generator application
SEMOD172162-90 v4
In case of out of step conditions this shall be checked if the pole slip centre is inside the
generator (zone 1) or if it is situated in the network (zone 2).
1MRK 505 343-UEN B
Section 7
Impedance protection
385
Application manual
Содержание Relion 670 series
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