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-
Real part (R) of Z in Ohms
Im
a
g
in
a
ry
p
a
rt
(
X
)
o
f Z
in
O
h
m
s
^ ^ ^ ^ ^ ^ ^
^ ^ ^ ^ ^ ^ ^
^ ^ ^ ^
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Ztr
Ze
Zgen
SE
RE
Z(R,X)
R
Zline
Zone 2
relay
¬
Z-line
120°
¬
Lens is the locus
of constant rotor (power)
angle, e.g. 120°.
Lens' width determined
by the setting Pickup Angle
X
Position of the OOS
relay is the origin of
the R - X plane
Zone 1
limit-of-reach
®
circle depends on
the position of the
points SE and RE
X-line
determined
by the
®
setting
ReachZ1
ANSI10000112-1-en.vsd
ANSI10000112 V1 EN
Figure 79:
Construction of the lens characteristic for a power system
IEC10000113-2-en.vsd
d
Y
G
Generator
13.8 kV
13.8 kV
Power line
220 kV
Infinite power
system
Out-Of-Step
protection
OOSPPAM
Transformer
13.8 / 220 kV
System
equivalent
REG
Zgen(Rgen
, Xgen
)
Ztr(Rtr, Xtr)
Zline(Rline, Xline)
Zeq(Req, Xeq)
ReverseZ
ForwardZ(ForwardR, ForwardX)
ReverseR = Rg
ForwardR = Rtr + Rline + Req
ReverseX = Xd’
ForwardX = Xtr + Xline + Xeq
All impedances must be referred to the generator voltage 13.8 kV
SE
RE
d
Y
G
Generator
13.8 kV
13.8 kV
Power line
220 kV
Infinite power
system
Out-Of-Step
protection
OOSPPAM
Transformer
13.8 / 220 kV
System
equivalent
REG
Zgen(Rgen
, Xgen
)
Ztr(Rtr, Xtr)
Zline(Rline, Xline)
Zeq(Req, Xeq)
ReverseZ(ReverseR, ReverseX))
ForwardZ(ForwardR, ForwardX)
ReverseR = Rg
ForwardR = Rtr + Rline + Req
ReverseX = Xd’
ForwardX = Xtr + Xline + Xeq
All impedances must be referred to the generator voltage 13.8 kV
SE
RE
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
, 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:
1MRK 502 048-UUS A
Section 7
Impedance protection
181
Technical manual
Summary of Contents for 650 series
Page 1: ...Relion 650 series Generator protection REG650 ANSI Technical manual ...
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