11.1.3.5 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 88 and equation 89.
EQUATION1523 V3 EN-US (Equation 88)
EQUATION1524 V4 EN-US (Equation 89)
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.
11.1.3.6 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.
11.2 Fuse failure supervision VDSPVC
GUID-9C5BA1A7-DF2F-49D4-A13A-C6B483DDFCDC v2
11.2.1 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
11.2.2 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
Section 11 1MRK 505 370-UEN D
Secondary system supervision
242 Busbar protection REB670
Application manual
To Next Page
Loading...
