ABB Relion 670 Series Applications Manual page 311

1MRK 511 401-UEN Rev. K
The setting of
DI< low (approximately 10% of IBase ) to avoid unwanted operation due to normal switching
conditions in the network. The delta current and delta voltage function shall always be used
together with either the negative or zero sequence algorithm. If
for operation of dU/dt and
DU> and DI< will be given according to equation
> =
DU
EQUATION1523 V3 EN-US
ISet
< =
DI
EQUATION1524 V4 EN-US
The voltage thresholds
below the minimum operating voltage that might occur during emergency conditions. A
setting of approximately 70% of
The current threshold
function. A 5...10% lower value is recommended.
14.2.3.6 Dead line detection
The condition for operation of the dead line detection is set by the parameters
current threshold and
Set the
margin of at least 15-20% is recommended. The operate value must however exceed the
maximum charging current of an overhead line, when only one phase is disconnected (mutual
coupling to the other phases).
Set the
safety margin of at least 15% is recommended.
14.3 Fuse failure supervision VDSPVC
14.3.1 Identification
Function description
Fuse failure supervision
14.3.2 Application
Some protection functions operate on the basis of measured voltage at the relay point.
Examples of such protection functions are distance protection function, undervoltage function
and energisation-check function. These functions might mal-operate if there is an incorrect
measured voltage due to fuse failure or other kind of faults in voltage measurement circuit.
VDSPVC is designed to detect fuse failures or faults in voltage measurement circuit based on
comparison of the voltages of the main and pilot fused circuits phase wise. VDSPVC output
Bay control REC670
Application manual
DU> should be set high (approximately 60% of UBase ) and the current threshold
ISet
USet
prim
.
100
UBase
prim
.
100
IBase
UPh> is used to identify low voltage condition in the system. Set UPh>
IPh> shall be set lower than the IMinOp for the distance protection
UDLD< for the voltage threshold.
IDLD< with a sufficient margin below the minimum expected load current. A safety
UDLD< with a sufficient margin below the minimum expected operating voltage. A
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the primary current for operation of dI/dt, the setting of
prim
181 and equation 182.
UBase is recommended.
IEC 61850 IEC 60617
identification identification
VDSPVC VTS
Secondary system supervision
USet
is the primary voltage
prim
(Equation 181)
(Equation 182)
IDLD< for the
GUID-9C5BA1A7-DF2F-49D4-A13A-C6B483DDFCDC v2
GUID-109434B0-23E5-4053-9E6E-418530A07F9C v2
ANSI/IEEE C37.2
device number
60
GUID-AD63BF6C-0351-4E48-9FB2-9AB5CF0C521E v2
Section 14
M13683-78 v4
305