11.1.3.5 Delta V and delta I
GUID-02336F26-98C0-419D-8759-45F5F12580DE v7
Set the operation mode selector OpDVDI to Enabled if the delta function shall be in
operation.
The setting of DVPU should be set high (approximately 60% of VBase) and the current
threshold DIPU 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 VSet
prim
is the primary voltage for operation of dU/dt and ISet
prim
the
primary current for operation of dI/dt, the setting of DVPU and DIPU will be given
according to equation 86 and equation 87.
EQUATION1765-ANSI V2 EN-US (Equation 86)
ANSIEQUATION2385 V2 EN-US (Equation 87)
The voltage thresholds VPPU is used to identify low voltage condition in the system.
Set VPPU below the minimum operating voltage that might occur during emergency
conditions. A setting of approximately 70% of VBase
is recommended.
The current threshold 50P 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 IDLDPU
for the current threshold and UDLD< for the voltage threshold.
Set the IDLDPU 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 VDLDPU 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 (60)
GUID-9C5BA1A7-DF2F-49D4-A13A-C6B483DDFCDC v2
1MRK 505 370-UUS A Section 11
Secondary system supervision
Busbar protection REB670 2.2 ANSI 289
Application manual
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