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 90.
> or > 100
S e tPrim
Base
U
Ud MainBloc k Ud PilotAlarm
U
= ×
IECEQUATION2424 V2 EN-US (Equation 90)
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.
11.3 Voltage based delta supervision DELVSPVC
GUID-579ED249-B8C9-4755-9E80-28E2BA8E5377 v2
11.3.1 Identification
GUID-C7108931-DECA-4397-BCAF-8BFF3B57B4EF v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage based delta supervision DELVSPVC – 7V_78V
11.3.2 Application
GUID-D179DBA4-B068-4A1E-A53E-477BD3B6ACFC v2
In a weak grid networks, fault detection and operation of other protection functions is reliably
done by delta supervision functionality. In this type of network, a delta based release criteria is
used to release the trip signal. The measurement of delta differs from country to country
between magnitude, vector or sample based detection.
In this function, a voltage based delta supervision is implemented in a phase segregated
design. The delta function has the following features:
• Instantaneous sample based delta detection
• True RMS value based delta detection
• DFT magnitude based delta detection
• Vector shift protection
The Delta detection mode is selected on the basis of application requirements. For example,
Instantaneous sample based delta supervision is very fast; the delta is detected in less than a
cycle typically. Hence, instantaneous sample based delta supervision can be used for functions
that are used as protection enablers or fault detectors
All the other supervision modes like RMS/DFT Mag or Angle requires minimum one cycle for
delta detection and can be used for time delay functions.
Section 11 1MRK 505 370-UEN D
Secondary system supervision
244 Busbar protection REB670
Application manual
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