Advertisement
‡Note: PLC connection point 'CB_MANUAL_CLOSE' is provided so that the user can
utilize the ARC function to close the CB manually if an external switch (such as a
push button on a relay/control panel) is required for manual operation.
Success check logic - settings
(vi)
Figure 2.22-8 illustrates the Success check logic that determines whether the CB closed
successfully for the ARC function reclose operation. When this check is required, On should be
set for scheme switch [ARC-SucChk].
If it is determined that all CB phases were closed successfully, (i.e. the
'CB_ALLPH_CLOSE' signal remains high for a sufficient duration after the 'ARC SHOT' signal
is issued by the Issuing command logic), an 'ARC CLOSE SUCCESS' signal is issued. On the
other hand, if the 'ARC SHOT' single is issued but the CB has failed to close, then on the
timeout of the [TARCDSUC] timer, an 'ARC CLOSE FAIL' signal is issued.
ARC SHOT
logic
Issuing command
on logic
ARC NOT_IN-PROG
Initiati
on logic
Initiati
logic
Coordination
From PROT_COMM
CB_ALLPH_CLOSE
Note: When the scheme switch ([ARC-SucChk]=Off), the functionality of the
[TARCDSUC] timer is explained in Chapter 2.22.2(xi)-2.
Shot counter logic behavior
(vii)
The Shot counter logic is shown in Figure 2.22-9. The following rule applies in Table 2.22-1;
the 'SHOT_1ST' signal is issued to the flip-flop logic unconditionally; the 'SHOT_2ND' signal
is issued to the flip-flop when the 'ARC SHOT1' signal is issued, see Figure 2.22-2.
≥1
ARC_START
S
R
ARC COORD
Off
ARC-SucChk
On
Figure 2.22-8 Success check logic
- 242 -
&
TARCDSUC
t
0
&
0.10-100.0s
1
&
0.1s
t
0
0.02s
6F2T0207 (0.01)
To Final trip stage
8C00001B6F
ARC CLOSE FAIL
To Initiation logic
ARC SHOT RS
8000001B70
ARC CLOSE SUCCESS
GRE200 (5,6)
Advertisement
