ABB RELION 670 Series Applications Manual page 244

Section 11
Secondary system supervision
3 0 I PU
EQUATION2293-ANSI V2 EN-US
where:
3I0PU
IBase
11.1.3.5 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
and DIPU will be given according to equation
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.
11.1.3.6 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).
VDLDPU with a sufficient margin below the minimum expected operating voltage. A safety
Set the
margin of at least 15% is recommended.
238
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
92 and equation 93.
GlobalBaseSel
GUID-02336F26-98C0-419D-8759-45F5F12580DE v7
VSet
is the primary voltage for
prim
IDLDPU for the
Application manual
1MRK 505 337-UUS A
(Equation 91)
DVPU
(Equation 92)
(Equation 93)
M13683-78 v4