ABB REG670 Applications Manual page 275

1MRK 502 071-UEN -
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
2
UBase 400
= =
ZBase
SBase 1000
EQUATION1960 V1 EN
= +
ZA Z line ( ) Zsc station (
EQUATION1961 V1 EN
This corresponds to:
+
2 j 52
= =
ZA 0.0125
160
EQUATION1962 V1 EN
Set ZA to 0.32.
= =
ZB Zsc station ( 1)
EQUATION1963 V1 EN
This corresponds to:
j 32
= =
ZB j 0.20 pu
160
EQUATION1964 V1 EN
Set ZB to 0.2
This corresponds to:
+
2 j 20
= =
ZC 0.0125
160
EQUATION1966 V1 EN
Set ZC to 0.13 and AnglePhi to 88°
The warning angle (StartAngle) should be chosen not to cross into normal operating
area. The maximum line power is assumed to be 2000 MVA. This corresponds to
apparent impedance:
2 2
U 400
= = =
Z 80
S 2000
EQUATION1967 V1 EN
2
=
160 ohm
400
= + +
2) 2 j 20 j
5000
+ =
j 0.325 pu 0.325 88
2
400
=
j j 32 ohm
5000
= Ð °
0.20 90 pu
+ =
j 0.125 pu 0.126 84
ohm
Section 8
Impedance protection
2
= +
2 j 52 ohm
Ð °
pu
Ð °
pu
(Equation 151)
(Equation 152)
(Equation 153)
(Equation 154)
(Equation 155)
(Equation 156)
(Equation 157)
269