Functions
6-26
7SJ63 Manual
C53000-G1140-C120-1
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
'HILQLWH7LPHRQO\
, 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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