Functions
6-26 7SJ62 Manual
C53000-G1140-C121-1
Figure 6-14 Reverse Interlocking Protection Scheme
6.2.2 Programming Time-Overcurrent Settings
6.2.2.1 Programming Settings for Time-Overcurrent Phase Protection
General The functions associated with time-overcurrent protection were established during
configuration of protective functions (Section 5.1) at address &KDUDF3KDVH.
If address was set to 'HILQLWH7LPH RQO\ , then only the settings for the def-
inite-time elements are available.
At address )&7, phase time-overcurrent protection may be switched 21
or 2)).
50-2 Relay Element The pickup and delay of the 50-2 relay element are set at addresses
3,&.83 and '(/$< respectively. The 50-2 relay element is typically uti-
lized for protection against high magnitude faults. For this reason, the relay element
pickup is often set high while the delay is set short. It is always important to set the
T
50-1
T
50-2
t
1
T
50-1
T
50-2
t
1
TRIP TRIP TRIP TRIP
Fault Location B: Source-side Trip Time = T
50-2
= Source side 50-2 Delay
Fault Location A: Load-side Trip Time = t
1
Source-side Backup Trip Time = T
50-1
=Source-side 50-1 Delay
B
A
Normal Load Flow
´%ORFN´
t
1
52
52
52
50-1 50-2 50-1 50-1
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