Toshiba GR200 Series - 2.22 Overvoltage protection for phase-to-phase (OVS)

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 309 -
Overvoltage protection for phase-to-phase (OVS)
The over voltage protection function in phase-to-phase (OVS) detects an over voltage condition
that phase-to-neutral voltage is larger than a setting and operates accordingly. The OVS
function has two stages (elements; OVS1 and OVS2), which operate independently. The OVS
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
OVS 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 OVS1 is discussed, but the expression is applicable to
OVS2; hence, read the expression for OVS1 as the OVS2 stage unless a special explanation or
instruction has been provided.
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Note: Several IED models do not have phase-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 2.22-1 Comparative table in respective ordering numbers
feature
Ordering No. at “G&T”
33
37
OVS
Phase-phase over-voltage protection
✓
✓
✓: Applicable NA: Not applicable