ABB RELION 670 Series Applications Manual page 247

1MRK 505 337-UUS A
The settings
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
phase voltage of measured fuse group, the setting of
given according to equation 94.
Vdif Main block or Vdif Pilot alarm=
ANSI13000279 V1 EN-US
V
is defined as phase to neutral or phase to phase voltage dependent of the selected
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 the
VSealIn setting. The fuse failure outputs are deactivated when the normal voltage conditions are
restored.
Application manual
Vdif Main block and Vdif Pilot alarm should be set low (approximately 30% of VBase )
V
SetPrim
V
Base
V
is the desired pick up primary phase-to-
SetPrim
Vdif Main block and Vdif Pilot alarm will be
⋅100
V
.
SetPrim
Section 11
Secondary system supervision
(Equation 94)
241