Toshiba GR200 Series Instruction Manual page 46
Centralized busbar protection ied
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Figure 2.1-11 shows each CH generates trip and transfer-trip signals. The DIF relay can
use Fail-safe signal for the decision of DIF trip issuing; the Fail-Safe function can monitor the
system voltages and issues a permissive signal on the detection of a fault. Note that a fault
will be detected when either an under voltage occurs (phase-phase/phase-neutral faults) or an
over voltage occurs in the residual monitored voltage (phase-earth fault).
To augment to generate the trip commands, PLC connection points are provided in
respective zones. For instance of the zone A, the PLC connection point "ADD.DIF.TP-ZA" is
provided in front of the issuing stage of the signal "DIF.OPT-ZAX". Accordingly, if the trip
signal "DIF.OPT-ZAX" should be generated upon occurrence of the trip command "DIF.OPT-
ZB", it is possible to issue the one when the user programs to connect the trip command
"DIF.OPT-ZA" with the PLC connection point "ADD.DIF.TP-ZA".
For the operation of the "check zone and discriminating zone protection", it is required
that there are no failures in both CT circuits and for differential current monitoring (For more
information of CTF and IDSV, see section 2.1.8 and 2.1.9).
DIF setting
(ii)
Table 2.1-3 shows the setting elements necessary for DIF together with the respective setting
ranges.
Setting items
Mode / range
DIF-EN
10 – 20,000
DIFCH-I
0 – 90
DIFCH-Slope
CTSCCH-EN
10 – 20,000
DIFDZ-I
0 – 90
DIFDZ-Slope
CTSCDZ-EN
CH&DZ
DIFTP-FORM
DIFTP-FS
Note: For the DIF operation, the user should set values concerning to 'CT primary
currents' and 'CT ratios' on the VCT. For more information about the VCT
settings, see Chapter
Table 2.1-3 DIF setting switch
Unit
Off
Blocking DIF protection
–
On
Enabling DIF protection
A
Minimum operating current in DIFCH
Id-Ir characteristic percentage slope in
%
DIFCH
Off
Blocking CTSC in DIFCH
–
On
Enabling CTSC in DIFCH
Minimum
A
DIFZA,DIFZB, and others
Id-Ir characteristic percentage slope in
%
DIFZA,DIFZB, and others
Off
Blocking CTSC in DIFDZ
–
On
Enabling CTSC in DIFDZ
Operation
Discriminating-zone
–
CH
Operation in Check-zone only
DZ
Operation in Discriminating-zone only
Off
DIF trip issued without FS operation
–
On
DIF trip issued with FS operation
Technical description: Transformer module for AC analog
- 32 -
Contents
operating
current
in
both
Check-zone
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)
6F2S1931 (0.20)
Default
On
2,000
30
On
in
2,000
30
On
and
CH&DZ
Off
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