6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 253 -
Earth fault overvoltage protection (OVG)
The earth fault overvoltage protection (OVG) function has two stages (OVG1 and OVG2); and
the time characteristic of each stage can be taken from either definite time or inverse definite
minimum time. The purpose of each stage of the OVG is to detect earth fault on unearthed,
resistance-earthed system or AC generators.
The low voltage setting, which may be applied for an OVG element, is susceptible to any
third harmonic component that may be superimposed on an input signal. Therefore, the
function incorporates the filter to suppress the third harmonic component.
To simplify the description, only OVG1 is discussed but is applicable to OVG2; hence,
read the expression for OVG1 as OVG2 for the OVG 2nd stage unless a special explanation or
instruction has been provided.
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Note:
The implementation of particular 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 for the “G&T position” whilst
referring to the comparison table below. For more information, see
Appendix: Ordering
.
Table 2.14-1 Comparative table in respective ordering numbers
Sec.
Feature
Ordering No. at “G&T”
31
32
–
Main features
✓
✓
: Applicable NA: Not applicable
)
Содержание GR 200 Series
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Страница 1354: ...6F2S1915 0 46 GRZ200 Soft 031 032 1333 Appendix 1 Signal list for common function ...
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Страница 1480: ...6F2S1915 0 46 GRZ200 Soft 031 032 1459 Appendix 6 Ordering ...
Страница 1497: ...6F2S1915 0 46 GRZ200 Soft 031 032 1476 Appendix 7 Technical data ...
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Страница 1520: ...6F2S1915 0 46 GRZ200 Soft 031 032 1499 Appendix 9 Matrix between VCT terminals and relay applications ...
Страница 1523: ...6F2S1915 0 46 GRZ200 Soft 031 032 1502 Appendix 10 CT requirement ...
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