Toshiba GR200 Series Instruction Manual page 73

CBF re-trip
(ii)
The scheme [CBF-Retrip_CH*] is used for selecting the re-trip operation mode (either Off,
On, or On-T). The re-trip signal is generated once the OCCBF_CH* relay operates in the
setting [CBF-Retrip_CH*]=On. However, in the [CBF-Retrip_CH*]=On-T, the re-trip signal can
be generated with absence of the OCCBF_CH* operation. Note that The PLC signal
'CBF_BLOCK' will block to issue the 'Re-trip' signals in all CHs.
When the user wishes to delay to issue the 'Re-trip' signal in CH*, the user can apply a
delay timer with setting [TCBF-RE_CH*]. A setting time is chosen between 0.00 to 300.00 sec;
the user should determine the time by considering the response time of the CB.
The user can select the mode in the Re-trip scheme using the switch [CBFRe-TPMD]: for
phase segregated trip (1P) or 3-phase trip operation (3P).
Setting items Mode / range
CBFRe-TPMD
CBF-Retrip_CH
0.000–300.000
TCBF-RE_CH
When wishing to issue a re-trip signal without the operation of OCCBF_CH* element,
the IED can also issue it with external signals using PLC connection points 'CBF-
SUB.OCCBF*'. This technique will be achieved when the user programs to inject a 'CB close
(closed) state signal' at the 'CBF-SUB.OCCBF*' points. It is useful if the CBF function cannot
determine the conditions of breaker failures, when OCCBF_CH* element fails to detect small
fault currents.
Table 2.2-6 CBF re-trip setting switches
Unit
1P / 3P – Single-phase trip (1P) or 3P trip
Off Canceling for Re-trip
On Operation of Re-trip
–
Re-trip
On-T
operation
s Timer for issuing Re-trip
- 59 -
Contents
operation after OCCBF-CH
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)
6F2S1931 (0.20)
Default
3P
On
0.200