ABB Relion 670 Series Applications Manual page 313

1MRK 511 401-UEN Rev. K
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 183.
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.
14.4 Voltage based delta supervision DELVSPVC
14.4.1 Function revision history
14.4.2 Identification
Function description
Voltage based delta supervision
14.4.3 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.
Angle shift mode
Use of distributed generation (DG) units is increasing due to liberalized markets (deregulation)
and the global trend to use more renewable sources of energy. They generate power in the
range of 10 kW to 10 MW and most of them are interconnected to the distribution network.
Bay control REC670
Application manual
or Ud PilotAlarm >
is defined as phase to neutral or phase to phase voltage dependent of the selected
© Copyright 2017 Hitachi Power Grids. All rights reserved
U
S etPrim
= ×
100
U
Base
U
.
SetPrim
IEC 61850 IEC 60617
identification identification
DELVSPVC
Secondary system supervision
U
is the desired pick up
SetPrim
Ud>MainBlock and
GUID-579ED249-B8C9-4755-9E80-28E2BA8E5377 v2
GUID-383C6822-E9FC-475E-82B3-0D4E247AEF72 v1
GUID-C7108931-DECA-4397-BCAF-8BFF3B57B4EF v2
ANSI/IEEE C37.2
device number
– 7V_78V
GUID-D179DBA4-B068-4A1E-A53E-477BD3B6ACFC v2
Section 14
(Equation 183)
307