Delta V And Delta I; Dead Line Detection - ABB Relion 670 Series Applications Manual

1MRK 511 358-UUS A
The setting of the current limit
be higher than the normal unbalance current that might exist in the system. The setting can be
calculated according to equation 115.
3 0 I PU
EQUATION2293-ANSI V2 EN-US
where:
3I0PU
IBase
12.2.3.5

Delta V and delta I

Set the operation mode selector
The setting of
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
operation of dU/dt and
DIPU will be given according to equation
and
DVPU =
EQUATION1765-ANSI V2 EN-US
DIPU
=
ANSIEQUATION2385 V2 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
A 5...10% lower value is recommended.
12.2.3.6

Dead line detection

The condition for operation of the dead line detection is set by the parameters
current threshold and
IDLDPU with a sufficient margin below the minimum expected load current. A safety
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).
Application manual
3I0PU is done in percentage of IBase . The setting of pickup must
3 0 I
100
= ×
IBase
is the maximal zero sequence current during normal operating conditions, plus a margin of 10...20%
is the base current for the function according to the setting
DVPU should be set high (approximately 60% of VBase ) and the current threshold
ISet
prim
VSet
prim
⋅100
VBase
ISet
prim
⋅100
IBase
VPPU is used to identify low voltage condition in the system. Set VPPU
VBase is recommended.
50P shall be set lower than the IMinOp for the distance protection function.
UDLD< for the voltage threshold.
OpDVDI to Enabled if the delta function shall be in operation.
the primary current for operation of dI/dt, the setting of
116 and equation 117.
Secondary system supervision
GlobalBaseSel
GUID-02336F26-98C0-419D-8759-45F5F12580DE v7
VSet
is the primary voltage for
prim
IDLDPU for the
Section 12
(Equation 115)
DVPU
(Equation 116)
(Equation 117)
M13683-78 v4
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