ABB REB670 Series Applications Manual page 250

Section 11
Secondary system supervision
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 90.
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.
11.3 Voltage based delta supervision DELVSPVC
11.3.1 Identification
Function description
Voltage based delta supervision
11.3.2 Application
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.
244
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
IEC 61850 IEC 60617
identification identification
DELVSPVC
1MRK 505 370-UEN D
GlobalBaseSel .
U
is the desired pick up
SetPrim
Ud>MainBlock and
GUID-579ED249-B8C9-4755-9E80-28E2BA8E5377 v2
GUID-C7108931-DECA-4397-BCAF-8BFF3B57B4EF v2
ANSI/IEEE C37.2
device number
– 7V_78V
GUID-D179DBA4-B068-4A1E-A53E-477BD3B6ACFC v2
Busbar protection REB670
Application manual
(Equation 90)