Alstom MiCOM P546 - 1.23.11 Aided DEF ground fault scheme - blocking (Distance option only)

Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546 (OP) 5-71
OP
Optional features of scheme
CRx
CRx
CTx
CTx
&
1
1
CB Open
CB Open
&
DEF-R
&
t
Bu1
1
Trip
A
1
Trip
B
&
&
&
DEF-F
DEF Inst
DEF Bu1
DEF Bu2
DEF IDMT
t
Bu2
t
IDMT
t
Bu1
t
Bu2
t
IDMT
DEF-F
DEF Inst
DEF Bu1
DEF Bu2
DEF IDMT
DEF-R
&
&
LD0V
LD0V
P1154ENa
P1134ENa
Figure 45 Aided DEF (ground) permissive scheme logic (Distance option only)
1.23.11 Aided DEF ground fault scheme – blocking (Distance option only)
Figure 45 shows the ele
ment reaches, and Figure 46 the simplified scheme logic. The
signaling channel is keyed from operation of the reverse DEF element of the relay. If the
remote relay forward IN> element has picked up, then it will operate after the set Time Delay
if no block is received.
Send logic: DEF Reverse
Trip logic: IN> Forward, plus Channel NOT Received, with small set delay
P1307ENa
B
A
ZL
IN> Fwd (A)
IN> Fwd (B)
IN>1 Rev (B)
IN>1 Rev (A)
Figure 46 The DEF blocking scheme (Distance option only)