Functions
2.21 Fault Locator
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
394
If the parallel line compensation is used, set address 3805 Paral.Line Comp to YES (presetting for devices
with parallel line compensation). Further prerequisites are that
• the earth current of the parallel line has been connected to the fourth current input I
4
with the correct polarity
and
• the current transformer ratio I4/Iph CT (address 221) in the Power System Data 1 has been set correctly
(refer also to Section 2.1.2.1 under „Current Transformer Connection“) and
• the parameter for the fourth current input I4 transformer has been set to In paral. line (address
220) in the Power System Data 1 (Section 2.1.2.1 under „Current Transformer Connection“) and
• the mutual impedances RM/RL ParalLine and XM/XL ParalLine (addresses 1126 and 1127) have
been set correctly in the general protection data (Power System Data 2, Section 2.1.4.1).
If load compensation is applied to single-phase faults in double-fed lines of an earthed system, set YES in
address 3806 Load Compensat.. If high fault resistances are expected for single-phase faults, e.g. at over-
head lines without overhead earth wire or unfavourable earthing conditions of the towers, this will improve the
accuracy of the distance calculation.
If two-ended fault location is not desired set address 3807 two ended to OFF. The default setting is ON.
If the fault location is required to be output as BCD-code, set the maximum time period the data should be avail-
able at the outputs using address 3811 Tmax OUTPUT BCD. If a new fault occurs, the data are terminated
immediately even when it occurs before this time has expired. Allocate the corresponding output relays as
stored if a longer time period is desired for the output. Once a fault occurred the data will be latched until the
memory is reset or a new fault is registered.
2.21.3 Settings
Addr. Parameter Setting Options Default Setting Comments
3802 START Pickup
TRIP
Pickup Start fault locator with
3805 Paral.Line Comp NO
YES
YES Mutual coupling parall.line com-
pensation
3806 Load Compensat. NO
YES
NO Load Compensation
3807 two ended ON
OFF
ON two ended fault location
3811 Tmax OUTPUT BCD 0.10 .. 180.00 sec 0.30 sec Maximum output time via BCD
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