ABB Relion 670 series - Page 471

2
20
0.15 0.3
200
T
ZC jX j j ohm= = × =
EQUATION1974 V1 EN (Equation 439)
This corresponds to:
0.3
0.15 0.15 90
2.0
j
ZC j pu pu= = = Ð
o
EQUATION1975 V2 EN (Equation 440)
Set ZC to 0.15 and AnglePhi to 90°.
The warning angle (StartAngle) should be chosen not to cross into normal operating area.
The maximum line power is assumed to be 200 MVA. This corresponds to apparent
impedance:
2 2
20
2
200
U
Z ohm
S
= = =
EQUATION1976 V1 EN (Equation 441)
Simplified, the example can be shown as a triangle, see figure 240.
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 465
Application manual