transformer.
UBase
is available in the Global Base Value groups; the particular Global Base
Value group, that is used by VDSPVC, is set by the setting parameter
GlobalBaseSel
.
The settings
Ud>MainBlock
and
Ud>PilotAlarm
should be set low (approximately 30% of
UBase
) so that they are sensitive to the fault on the voltage measurement circuit, since the
voltage on both sides are equal in the healthy condition. If
U
SetPrim
is the desired pick up
primary phase-to-phase voltage of measured fuse group, the setting of
Ud>MainBlock
and
Ud>PilotAlarm
will be given according to equation 117.
> or > 100
S e tPrim
Base
U
Ud MainBlock Ud PilotAlarm
U
= ×
IECEQUATION2424 V2 EN-US (Equation 117)
U
SetPrim
is defined as phase to neutral or phase to phase voltage dependent of the selected
ConTypeMain
and
ConTypePilot
. If
ConTypeMain
and
ConTypePilot
are set to
Ph-N
than the
function performs internally the rescaling of
U
SetPrim
.
When
SealIn
is set to
On
and the fuse failure has last for more than 5 seconds, the blocked
protection functions will remain blocked until normal voltage conditions are restored above
the
USealIn
setting. The fuse failure outputs are deactivated when the normal voltage
conditions are restored.
1MRK 511 358-UEN A Section 12
Secondary system supervision
223
Application manual
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