14.3.3 Setting guidelines
The parameters for Fuse failure supervision VDSPVC are set via the local HMI or
PCM600.
The voltage input type (phase-to-phase or phase-to-neutral) is selected using
ConTypeMain and ConTypePilot parameters, for main and pilot fuse groups
respectively.
The connection type for the main and the pilot fuse groups must be
consistent.
The settings Ud>MainBlock, Ud>PilotAlarm and USealIn are in percentage of the
base voltage, UBase. Set UBase to the primary rated phase-to-phase voltage of the
potential voltage 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
267.
> or > 100
S etPrim
Bas e
U
Ud MainBlock Ud PilotAlarm
U
= ×
IECEQUATION2424 V2 EN (Equation 267)
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.
Section 14 1MRK 502 071-UEN -
Secondary system supervision
478 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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