ABB REG670 Applications Manual page 218

Section 8
Impedance protection
212
TimerModeZx =
Enable PhPh or
Ph-E PhPh
PPZx AND
PEZx
AND
BLOCK
VTSZ
BLKZx OR
BLKTRZx
ZoneLinkStart
Phase Selection
1st starting zone
External start
LNKZ2
OR
LNKZ4
LNKZ5
EXTNST
IEC12000139 V4 EN
Figure 94: Logic for linking of timers
CVTtype
If possible, the type of capacitive voltage transformer (CVT) used for measurement
should be identified. The alternatives are strongly related to the type of ferro-
resonance suppression circuit included in the CVT. There are two main choices:
Passive type For CVTs that use a nonlinear component, like a saturable inductor, to limit overvoltages
(caused by ferro-resonance). This component is practically idle during normal load and
fault conditions, hence the name "passive." CVTs that have a high resistive burden to
mitigate ferro-resonance also fall into this category.
Any
This option is primarily related to the so-called active type CVT, which uses a set of
reactive components to form a filter circuit that essentially attenuates frequencies other
than the nominal to restrain the ferro-resonance. The name "active" refers to this circuit
always being involved during transient conditions, regardless of the voltage level. This
option should also be used for the types that do not fall under the other two categories, for
example, CVTs with power electronic damping devices, or if the type cannot be identified
at all.
None
This option should be selected if the voltage transformer is fully magnetic.
(Magnetic)
INReleasePE
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
tPPZx
OR AND
AND
t
tPEZx
OR
AND
t
AND
TimerLinksZx
OR
LoopLink (tPP-tPE)
LoopLink & ZoneLink
OR
No Links
FALSE (0)
TimerLinksZx =
LoopLink & ZoneLink
1MRK 502 071-UEN -
OR
LNKZx
AND
IEC12000139-4-en.vsdx
Application manual