ABB RELION 670 SERIES Applications Manual page 186

Section 8
Impedance protection
180
2 2
I
L
0 0
-2 -2
0 0 0.02 0.02 0.04 0.04 0.06 0.06
5 5
I
V
0 0
-5 -5
0 0 0.02 0.02 0.04 0.04 0.06 0.06
50 50
U
C
0 0
-50 -50
0 0 0.02 0.02 0.04 0.04 0.06 0.06
0 0
X
-20 -20
C
-40 -40
0 0 0.02 0.02 0.04 0.04 0.06 0.06
IEC06000597 V1 EN
Figure 79: TCSC wave forms presented in capacitive boost mode for a typical 50Hz
system
The apparent impedance of the TCSC (the impedance seen by the power system) can
typically be increased to up to 3 times the physical impedance of the capacitor, see figure
80. This high apparent reactance will mainly be used for damping of power oscillations.
3.2
B
3
2.8
2.6
2.4
2.2
Continuous
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
0 300 600
IEC06000598 V1 EN
Figure 80: Operating range of a TCSC installed for damping of power oscillations
(example)
0.08 0.08 0.1 0.1 0.12 0.12 0.14 0.14 0.16 0.16 0.18 0.18
0.08 0.08 0.1 0.1 0.12 0.12 0.14 0.14 0.16 0.16 0.18 0.18
0.08 0.08 0.1 0.1 0.12 0.12 0.14 0.14 0.16 0.16 0.18 0.18
0.08 0.08 0.1 0.1 0.12 0.12 0.14 0.14 0.16 0.16 0.18 0.18
en06000597.vsd
Imperatriz TCSC, Operating range
C D
30 min 10s
A
E
900 1200 1500 1800
Line current (Arms)
1MRK 506 369-UUS -
0.2 0.2
0.2 0.2
0.2 0.2
0.2 0.2
G
F
2100 2400 2700 3000
en06000598.vsd
Line distance protection REL670 2.2 ANSI
Application manual
Continuous
30 min. overload
10s overload
Bypass mode
Series5