TZx
t
tPPZx
t
tPEZx
BLOCK
PPZx
PEZx
TimerLinksZx
LoopLink (tPP-tPE)
LoopLink & ZoneLink
No Links
LNKZ1
FALSE (0)
TimerLinksZx =
LoopLink & ZoneLink
LNKZRV
LNKZ2
LNKZx
OR
LNKZ3
LNKZ4
LNKZ5
ZoneLinkStart
STPHS
Phase Selection
1st starting zone
VTSZ
BLKZx
BLKTRZx
OR
OR
OR
OR
OR
AND
AND
OR
AND
AND
AND
TimerModeZx =
Enable Ph-Ph,
Ph-E
AND
AND
IEC12000139-3-en.vsdx
IEC12000139 V3 EN-US
Figure 199: 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.
INReleasePE
This setting opens an opportunity to enable phase-to-earth measurement for phase-to-phase-
earth faults. It determines the level of residual current (3I0) above which phase-to-earth
measurement is activated (and phase-to-phase measurement is blocked). The relations are
defined with the equation.
1MRK 505 343-UEN B
Section 7
Impedance protection
323
Application manual
Содержание Relion 670 series
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