ABB Relion Technical Manual page 187

1MRK 502 048-UUS A
Technical manual
0.6
0.4
X-line -
-
determined
-
®
by the
^ ^ ^ ^
-
0.2
setting
-
ReachZ1
-
- -
0 Zone 1
-
-
-
-
-0.2
-
®
limit-of-reach
-
circle depends on
-0.4
the position of the
points SE and RE
-0.6
-0.8 -0.6 -0.4
ANSI10000112 V1 EN
Figure 79: Construction of the lens characteristic for a power system
ReverseZ(ReverseR, ReverseX)) ReverseZ
Zgen(Rgen , Xgen ) Zgen(Rgen , Xgen )
Generator Generator
13.8 kV 13.8 kV
13.8 kV 13.8 kV
G G
SE SE
Out-Of-Step Out-Of-Step
REG REG
protection protection
OOSPPAM OOSPPAM
IEC10000113 V2 EN
Figure 80: Example of an actual power system
To be able to automatically construct the lens characteristic for a system shown in
80, the actual power system must be modeled as a two-machine equivalent system, or as
a single machine – infinite bus equivalent system, the following information is necessary:
X
-
- RE -
- -
- -
- - -
- -
- - - -
- - -
- - - -
- -
- - - -
- -
Ze
- -
- - -
Zone 2
- - - -
- -
- -
- -
- -
- -
Zline
- -
- -
- -
^ ^ ^ ^
- -
^ ^ ^ ^
- -
^ ^ ^ ^
- -
Ztr
- -
- -
- -
relay
- -
120°
- -
- -
- -
- - ¬
Z-line
- -
- -
- -
Zgen
- -
- -
- -
- -
¬
- - - -
- - -
- -
- -
- -
-
- - -
- -
-
- - -
- -
-
- - -
- -
- -
- -
- -
-
SE
by the setting Pickup Angle
-0.2 0 0.2
Real part (R) of Z in Ohms
ForwardZ(ForwardR, ForwardX) ForwardZ(ForwardR, ForwardX)
Ztr(Rtr, Xtr) Ztr(Rtr, Xtr) Zline(Rline, Xline) Zline(Rline, Xline)
Transformer Transformer
13.8 / 220 kV 13.8 / 220 kV
d d
Y Y
ReverseR = Rg ReverseR = Rg
ReverseX = Xd' ReverseX = Xd'
All impedances must be referred to the generator voltage 13.8 kV All impedances must be referred to the generator voltage 13.8 kV
Impedance protection
Position of the OOS
relay is the origin of
-
the R - X plane
-
-
-
-
-
-
- -
-
- -
-
- -
- -
-
^ ^
- -
R
- -
- -
- -
-
- -
-
Z(R,X)
-
-
-
-
Lens is the locus
-
of constant rotor (power)
-
-
angle, e.g. 120°.
-
Lens' width determined
0.4 0.6 0.8 1
ANSI10000112-1-en.vsd
Zeq(Req, Xeq) Zeq(Req, Xeq)
Infinite power Infinite power
Power line Power line System System
220 kV 220 kV equivalent equivalent
ForwardR = Rtr + Rline + Req ForwardR = Rtr + Rline + Req
ForwardX = Xtr + Xline + Xeq ForwardX = Xtr + Xline + Xeq
IEC10000113-2-en.vsd
Section 7
system system
RE RE
Figure
181