Qualitrol INFORMA PMD-A, User Manual, Page: 163 / 248

Appendix B – INFORMA PMD-A Functions
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Figure B.6 - Inter-Harmonics Record
Note
• Voltage inter-harmonics applied to the device is 10% and then
5% of nominal voltage 230V AC.
•
The green line indicates the voltage RMS value and the blue line
indicates the voltage inter-harmonic (% of fundamental) value on
a single phase.
•
The user can observe a slight variation in the voltage RMS
because of the delay in the transition of voltage inter-harmonics
from 10% to 5% of nominal voltage.
Mains Signaling Voltage
Voltage signals whose frequencies are different from the fundamental frequency are injected
into the network. These injected voltage signals have to remain within acceptable limits
(maximum RMS value) to avoid disturbing the connected equipments.
Signaling voltage records are of fixed length (no re-triggering during a recording) and
composed of 10-second pre fault and up to a maximum of 120-second post fault, specified
by the user in 10-second steps.