55
6
F
2
S
0
8
3
4
the echo signal is inhibited for 250 ms by delayed drop-off timer T1 even after they have reset.
In order to prevent any spurious echo signal from looping round between the terminals in a healthy
state, the echo signal is restricted to last for 200 ms by delayed pickup timer T2.
The echo function can be disabled by the scheme switch [ECHO] and the PLC signal
ECHO_BLOCK.
The setting element necessary for the echo function and its setting range is as follows:
Element Range
Step
Default
Remarks
TECCB
0.00 – 200.00 s 0.01 s
0.10 s
Echo enable timer
ECHO OFF/ON
ON Echo
function
768:C/R_DISECHO-A
769:C/R_DISECHO-B
770:C/R_DISECHO-C
619:C/R_DISECHO
ECHO_BLOCK
1840
1
≥
1
" ON "
&
&
&
≥
1
200ms
50ms
(+)
t
0
Z3
Z2
Z4
T2
T1
250ms
0 t
0
t
R2-CR
ECH
[ZONESEL]
"Z3"
"Z2"
ECH
[ECHO]
1
1
CB-OR
≥
1
&
[
TERM
]
"3TERM"
(
+
)
&
R1-CR
1
&
TECCB
0.00 - 200.00s
t
0
Figure 2.4.3.5 Echo Logic
Figure 2.4.3.6 shows the scheme logic of the weak infeed trip function. Weak infeed tripping is
executed on condition that a trip permission signal has been received (R1-CR=1, R2-CR=0) for
the POP, and reception of a trip block signal has stopped (R1-CR=0, R2-CR=0) for the UOP, the
undervoltage element UVL (UVLS or UVLG) operates and neither forward overreaching zone 2
or zone 3 nor reverse looking Z4 operates.
WKIT_BLOCK
1841
1
WIT
&
WIT
[ZONESEL]
250ms
0 t
"Z3"
"Z2"
Z4
Z3
Z2
R2-CR
1
[
TERM
]
"2TERM"
(
+
)
≥
1
R1-CR
1
≥
1
&
CB-OR
UVL
[WKIT]
"ON"
(+)
775:WI_TRIP-A
776:WI_TRIP-B
777:WI_TRIP-C
213:WI_TRIP
Figure 2.4.3.6 Weak Infeed Trip Logic
www
. ElectricalPartManuals
. com
Summary of Contents for GRZ100-211B
Page 323: ... 322 6 F 2 S 0 8 3 4 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Page 343: ... 342 6 F 2 S 0 8 3 4 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Page 383: ... 382 6 F 2 S 0 8 3 4 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Page 395: ... 394 6 F 2 S 0 8 3 4 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Page 411: ... 410 6 F 2 S 0 8 3 4 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Page 423: ... 422 6 F 2 S 0 8 3 4 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Page 443: ... 442 6 F 2 S 0 8 3 4 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Page 451: ... 450 6 F 2 S 0 8 3 4 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Page 459: ... 458 6 F 2 S 0 8 3 4 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Page 463: ...w w w E l e c t r i c a l P a r t M a n u a l s c o m ...