Toshiba GR200 Series - 2.24 Phase under-voltage protection (UV)

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 323 -
Phase under-voltage protection (UV)
The under-voltage protection function for phase-to-earth (UV) consists of two stages (elements)
independently: UV1 and UV2. The time characteristic of the UV element is configured either
definite time (DT) or inverse definite minimum time (IDMT) using settings.
Each UV stage (element) detects the under-voltage condition of phase-to-earth. The user
can set a threshold and the ratio of a drip-out voltage (DO) to a pick-up voltage (PU) in the UV
element. To simplify the description, only the UV1 element is described, but the expression is
applicable to the UV2; hence, read the expression for the UV1 element as the UV2 unless a
special explanation or instruction has been provided.
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Note: Several IED models do not have phase under-voltage protection features. To
determine whether the features are implemented in the IED or not, locate the IED ordering
number; and check the order number at “G&T position” referring to the comparison table below.
For more information, see Appendix: Ordering .
Table 2.24-1 Comparative table in respective ordering numbers
feature
Ordering No. at “G&T”
33
37
UV
Phase under-voltage protection
✓
✓
✓: Applicable NA: Not applicable