Use the following block transformer data:
UBase: 20 kV (low voltage side)
SBase set to 200 MVA
e
k
: 15%
Short circuit power from the external network without infeed from the protected line: 5000
MVA (assumed to a pure reactance).
We have all phase voltages and phase currents available and fed to the protection IED.
Therefore it is recommended to set the
MeasureMode to positive sequence.
The impedance settings are set in pu with ZBase as reference:
2
2
20
2.0
200
UBase
ZBase
ohm
SBase
=
=
=
EQUATION1969 V1 EN-US
(Equation 458)
2
2
20
20
(
)
(
)
0.15
0.38
200
5000
ZA Z transf
Zsc network
j
j
j
ohm
=
+
=
×
+
=
EQUATION1970 V1 EN-US
(Equation 459)
This corresponds to:
0.38
0.19
0.19 90
2.0
j
ZA
j
pu
pu
=
=
=
Ð °
EQUATION1971 V1 EN-US
(Equation 460)
Set ZA to 0.19
2
20
'
0.25
0.5
200
d
ZB
jX
j
j
ohm
=
=
×
=
EQUATION1972 V2 EN-US
(Equation 461)
This corresponds to:
0.5
0.25
0.25 90
2.0
j
ZB
j
pu
pu
=
=
=
Ð °
EQUATION1973 V1 EN-US
(Equation 462)
Set ZB to 0.25
2
20
0.15
0.3
200
T
ZC
jX
j
j
ohm
=
=
×
=
EQUATION1974 V1 EN-US
(Equation 463)
This corresponds to:
1MRK 505 343-UEN B
Section 7
Impedance protection
387
Application manual
Содержание Relion 670 series
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