SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 6 of 71
Figure 6: Action of switched bandpass filter in voltage supply
Waveforms represent fault in Zone 1 close
to boundary of operation with large
exponential component in voltage
V–IZ
No zero crossings comparator
cannot operate
V
POL
Zero crossings re-started
comparator can operate
26-36 ms delay
before switching to
filtered supply
Inhibit pulse
V–IZ (with switched filter)
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