6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 314 -
2.22.1
CTF features
The CTF function has two relay elements in order to decide the failure in the CT; hence two
criterions exist to detect the failure in the CT in the CTF function.
(i)
Earth fault overcurrent element (EFCTF)
The earth fault overcurrent element (EFCTF) monitors the zero-sequence current for the
failure in the CT. The threshold of the EFCTF element is set using the [
EFCTF
].
(ii)
Earth fault overvoltage element (OVGCTF)
The earth fault overvoltage element (OVGCTF) monitors the zero-sequence voltage for the
failure in the CT. The OVGCTF element is set using the [
OVGCTF
].
(iii)
Detection criterion (CTF_DETECT)
When the EFCTF element operates whereas the OVGCTF element does not operate, the
detection criterion (CTF_DETECT) is applied.
2.22.2
Operation for the CTF function
When the CTF function detects the failure, issuing the CTF_DETECT signal is continuing
regardless of the operation of the OVGCTF relay, provided
On
is set for the scheme switch
[
CTF-EN
]. Issuing the CTF _DETECT is continued until the operation of the EFCTF relay is
reset.
However, nonetheless the OVGCTF relay is still running after the CTF detection, issuing
the CTF_DETECT signal is cleared, provided
OPT-On
is set
for the scheme switch [
CTF-EN
].
When issuing the CTF_DETECT signal continues longer than ten seconds, the signal
CTF_DETECT clears to generate the CTF_ALARM signal.
2.22.3
Scheme logic
Figure 2.22-1 shows the logic of the CTF function. CTF_DET signal is issued when the EFCTF
element is running and the OVGCTF element is not running.
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 ...
Страница 1369: ...6F2S1915 0 46 GRZ200 Soft 031 032 1348 Unit mm Panel cut out for 1 2 case size Figure 2 2 3 Panel cutout figure 1 2 size case ...
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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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