Satec PM172EH Series, Инструкция по установке и эксплуатации

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82 Index
Fast transient voltages will trigger the Waveform Recorder to log voltage
and current waveforms at the time of the event. Note that the recorded
voltage waveforms will represent line-to-neutral voltages in all wiring
modes except of Open Delta where they will be line-to-line voltages. The
voltage disturbance threshold is defined in percent of the line-to-neutral or
line-to-line nominal voltage respectively.
Take into consideration that in the 4LN3 and 3LN3 wiring modes, the high
and low voltage triggers will represent line-to-neutral voltages; in all other
wiring modes they will be line-to-line voltages (see Note 6 to Table 4-7 in
Section 4.8).
The characteristics of the power quality events, such as a category,
phase, magnitude and duration, can be obtained by analyzing the Event
Log and Data Log files.
The duration of a power quality event can be calculated by taking the
difference between time stamps of the pair of records in the Event Log
recorded when a setpoint corresponding to the power quality trigger was
operated at the beginning of the event and was released at the end of the
event.
The phase, category and magnitude of a voltage and harmonic fault can
be obtained from the power quality Data Log record corresponding to the
event, i.e., having the same setpoint ID and the time stamp close to that
was recorded to the Event Log at the beginning of the event. The phase
and category of a voltage fault can be identified by comparing phase
magnitudes with thresholds recognized for different categories of voltage
faults. Use the following table to classify your voltage faults.
Voltage Fault Category Magnitude Typical Duration
Voltage interruption < 0.01 Vn on all phases
Voltage dip (sag) < 0.9 Vn 0.5 cycles – 1 min
Undervoltage < 0.9 Vn > 1 min
Voltage swell > 1.1 Vn 0.5 cycles – 1 min
Overvoltage > 1.1 Vn > 1 min