ABB RELION 670 Series Applications Manual page 519

1MRK 504 152-UEN B
transformer.
Value group, that is used by VDSPVC, is set by the setting parameter
The settings
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
primary phase-to-phase voltage of measured fuse group, the setting of
Ud>PilotAlarm will be given according to equation 516.
Ud MainBloc k >
IECEQUATION2424 V2 EN-US
U
SetPrim
ConTypeMain and ConTypePilot . If ConTypeMain and ConTypePilot are set to Ph-N than the
function performs internally the rescaling of
SealIn is set to On and the fuse failure has last for more than 5 seconds, the blocked
When
protection functions will remain blocked until normal voltage conditions are restored above
USealIn setting. The fuse failure outputs are deactivated when the normal voltage
the
conditions are restored.
Application manual
UBase is available in the Global Base Value groups; the particular Global Base
Ud>MainBlock and Ud>PilotAlarm should be set low (approximately 30% of
or Ud PilotAlarm >
is defined as phase to neutral or phase to phase voltage dependent of the selected
U
S etPrim
= ×
100
U
Base
U .
SetPrim
Secondary system supervision
GlobalBaseSel .
U
is the desired pick up
SetPrim
Ud>MainBlock and
Section 13
(Equation 516)
513