Toshiba GR200 Series Instruction Manual page 47

Current differential protection for the line
Current differential protection function (DIF) at local-terminal and remote-terminal can
operate by comparing the currents flow in and out in the line. The value of the current-
difference is close to zero when a fault does not occur (i.e., No fault). The DIF function consists
of a current segregated current differential protection (DIFL) and a zero-sequence current
differential protection (DIFG); they can detect phase-to-phase fault, phase-to-ground fault, and
a phase-to-ground fault. The DIFL and DIFGL functions can operate for on the three-terminal
line; remote differential trip (RDIF) function can substitute the operation of the DIFL and
DIFGL functions when an error occurs on the communication channel.
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Note: The implementation of such features is dependent upon the selection of hardware and
the configuration of functions. Several IED models do not support certain features. To
determine whether a particular feature has been implemented within an IED, identify the IED
ordering number; and check the order number at the 'G&T position' referring to the comparison
table below. For more information, see
Table 2.1-1 Comparative table in respective ordering numbers
Section feature
2.2.1
2.2.2
2.2.2
2.2.2 DIFL
2.2.3
2.2.4
2.2.5
2.3.1
2.3.2
DIFGL
2.3.3
2.3.4
2.4 CTsat
2.5 CT matching
2.6 Usage in 1.5CB
2.7 RDIF
2.8 Misc.
✓: Applicable
Appendix: Ordering
Relay function/ features
Current differential
Check relay OC (OCs)
Check relay UV (UVs)
CT failure detection using Id (DIFL-CTF)
CT circuit failure detection (DIFL-CTF)
Charging current compensation (DIFL-Ic)
Id current monitoring (DIFL-IdSV)
Zero sequence current differential
Check relay EF (EFD)
CT circuit failure detection (DIFGL-CTF)
Charging current compensation (DIFGL-Ic)
CT saturation countermeasure
CT ratio/rating and fault currents
TFC and Stub features
Remote differential trip
Blind zone protection
NA: Not applicable
- 24 -
6F2S1914 (0.49)
.
Ordering No. at 'G&T'
33
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
GRL200 (Soft 033 & 037)
37
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓