13.2.3.5
Delta U and delta I
GUID-02336F26-98C0-419D-8759-45F5F12580DE v7
Set the operation mode selector
OpDUDI to On if the delta function shall be in operation.
The setting of
DU> should be set high (approximately 60% of UBase) and the current threshold
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
USet
prim
is the primary voltage
for operation of dU/dt and
ISet
prim
the primary current for operation of dI/dt, the setting of
DU> and DI< will be given according to equation
.
DU
USet
UBase
prim
> =
100
.
EQUATION1523 V3 EN-US
(Equation 557)
DI
ISet
IBase
prim
< =
100
.
EQUATION1524 V4 EN-US
(Equation 558)
The voltage thresholds
UPh> is used to identify low voltage condition in the system. Set UPh>
below the minimum operating voltage that might occur during emergency conditions. A
setting of approximately 70% of
UBase is recommended.
The current threshold
IPh> shall be set lower than the IMinOp for the distance protection
function. A 5...10% lower value is recommended.
13.2.3.6
Dead line detection
M13683-78 v4
The condition for operation of the dead line detection is set by the parameters
IDLD< for the
current threshold and
UDLD< for the voltage threshold.
Set the
IDLD< with a sufficient margin below the minimum expected load current. A safety
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
UDLD< with a sufficient margin below the minimum expected operating voltage. A
safety margin of at least 15% is recommended.
13.3
Fuse failure supervision VDSPVC
GUID-9C5BA1A7-DF2F-49D4-A13A-C6B483DDFCDC v2
13.3.1
Identification
GUID-109434B0-23E5-4053-9E6E-418530A07F9C v2
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fuse failure supervision
VDSPVC
VTS
60
13.3.2
Application
GUID-AD63BF6C-0351-4E48-9FB2-9AB5CF0C521E v2
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
1MRK 505 343-UEN B
Section 13
Secondary system supervision
515
Application manual
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