ABB Relion 650 Series Technical Manual page 154

Section 5
Impedance protection
VI Level based measurement detects the switch onto fault condition even though the voltage is
very low. The logic is based on current and voltage levels. The internal signal SOTF VILevel is
activated if a phase voltage is below the setting
above the setting
ZCVPSOF can be activated externally from input BC and thus setting
The function is released during a settable time
The function can be blocked by activating the input BLOCK.
VC
ANSI09000398 V1 EN-US
Figure 83: Simplified logic diagram for Automatic switch onto fault logic, voltage and
5.8.7 Technical data
Table 58: ZCVPSOF technical data
Parameter
Operate voltage, detection of dead line
Reset ratio, operate voltage
Operate current, detection of dead line
Reset ratio, operate current
Delay following dead line detection input before
Automatic switch into fault logic function is
automatically enabled
Time period after circuit breaker closure in which
Automatic switch into fault logic function is
active
148
IPhPickup longer than the time tDuration .
current based.
© Copyright 2011 ABB Power Grids. All rights reserved
UVPickup and corresponding phase current is
tSOTF.
Range or value Accuracy
(1–100)% of ± 0.5% of V
VBase
<105% -
(1–100)% of ± 1.0% of I
IBase
<105% -
(0.000–60.000) ± 0.5% ± 10 ms
s
(0.000–60.000) ± 0.5% ± 10 ms
s
1MRK 506 326-UUS B
AutoInit is bypassed.
n
n
Line distance protection REL650
Technical manual
M16043-1 v6