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
>
or
>
100
S etPrim
Base
U
Ud MainBlock Ud PilotAlarm
U
=
×
IECEQUATION2424 V2 EN-US
(Equation 559)
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 505 343-UEN B
Section 13
Secondary system supervision
517
Application manual
Summary of Contents for Relion 670 series
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