ABB Relion 670 series - Page 388

TZx
BLOCK
PPZx
PGZx
TimerLinksZx
LoopLink (tPP-tPG)
LoopLink & ZoneLink
no links
LNKZ1
FALSE (0)
TimerLinksZx =
LoopLink & ZoneLink
LNKZRV
LNKZ2
LNKZx
OR
LNKZ3
LNKZ4
LNKZ5
ZoneLinkStart
PUPHS Phase Selection
1st pickup zone
LOVBZ
BLKZx
BLKTRZx
OR
OR
OR
OR
OR
AND
AND
OR
AND
AND
AND
TimerModeZx =
Enable Ph-Ph,
Ph-G
AND
AND
ANSI12000139-2-en.vsdx
0
tPPZx
0
tPPZx
ANSI12000139 V2 EN
Figure 185: 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
(Magnetic)
This option should be selected if the voltage transformer is fully magnetic.
Section 8 1MRK 506 369-UUS -
Impedance protection
382 Line distance protection REL670 2.2 ANSI
Application manual