Delta V And Delta I; Dead Line Detection; Fuse Failure Supervision Vdspvc (60) - ABB REB670 Applications Manual

1MRK 505 337-UUS -
11.1.3.5
11.1.3.6
11.2
Application manual

Delta V and delta I

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 is the primary voltage for operation of dU/dt and ISet
prim
operation of dI/dt, the setting of DVPU and DIPU will be given according to equation
and equation 93.
VSet
prim
DVPU
= ⋅100
VBase
EQUATION1765-ANSI V2 EN
ISet
prim
DIPU
= ⋅100
IBase
ANSIEQUATION2385 V2 EN
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.

Dead line detection

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.

Fuse failure supervision VDSPVC (60)

Secondary system supervision
the primary current for
prim
Section 11
92
(Equation 92)
(Equation 93)
277