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 USetprim is the primary voltage for operation of dU/dt and ISetprim the
primary current for operation of dI/dt, the setting of DU> and DI< will be given
according to equation
76 and equation 77.
EQUATION1523 V2 EN (Equation 76)
EQUATION1524 V3 EN (Equation 77)
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.
9.2.3.6 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.
9.3 Breaker close/trip circuit monitoring TCSSCBR
9.3.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker close/trip circuit monitoring TCSSCBR - -
Section 9 1MRK 505 291-UEN A
Secondary system supervision
178
Application manual
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