ABB Relion 670 Series Applications Manual page 272

Section 13
Secondary system supervision
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 119.
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.
13.4 Voltage based delta supervision DELVSPVC(78V)
13.4.1 Identification
Function description
Voltage based delta supervision
13.4.2 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.
266
Vdif Main block and Vdif Pilot alarm should be set low (approximately 30% of VBase )
V
SetPrim
V
Base
IEC 61850
identification
DELVSPVC
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V
is the desired pick up primary phase-to-
SetPrim
Vdif Main block and Vdif Pilot alarm will be
⋅100
V
.
SetPrim
IEC 60617
identification
–
1MRK 511 401-UUS F
(Equation 119)
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
Bay control REC670
Application manual