Toshiba GR200 Series - 2.21 Overvoltage protection for phase-to-neutral (OV)

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 301 -
Overvoltage protection for phase-to-neutral (OV)
The over voltage protection function for phase (OV) detects an over voltage condition that
phase-to-neutral voltage is larger than a setting and operates accordingly. The OV function
has two stages (elements; OV1 and OV2), which operate independently. The OV element has a
time delay characteristic; and the user can select either (1) independent (definite) time
characteristic delay or (2) dependent (inverse) time characteristic delay. The OV element is
configured both the setting of a pickup voltage (PU) and the setting of a drop-off voltage (DO).
To simplify the description, only OV1 is discussed, but the expression is applicable to the
OV2; hence, read the expression for OV1 as the OV2 unless a special explanation or instruction
has been provided.
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Note: Several IED models do not have phase over-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 2.21-1 Comparative table in respective ordering numbers
feature
Ordering No. at “G&T”
33
37
OV
Phase over-voltage protection
✓
✓
✓: Applicable NA: Not applicable