ABB REG670 - Dead Line Detection

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
265 and equation 266.
DU
USet
UBase
prim
> = 100
.
EQUATION1523 V3 EN (Equation 265)
DI
ISet
IBase
prim
< = 100
.
EQUATION1524 V4 EN (Equation 266)
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.
14.2.3.6 Dead line detection
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.
14.3 Fuse failure supervision VDSPVC
14.3.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fuse failure supervision VDSPVC VTS 60
Section 14 1MRK 502 071-UEN -
Secondary system supervision
476 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual