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• Capture Parameter: The Alarm will be triggered based on the value of
the selected parameter.
Choices include:
None: no alarm
Vrms: voltage root mean squared
Urms: voltage phase minus phase root
mean squared
Arms: current root mean squared
VPST: voltage short term flicker
Vcf: voltage crest factor
Ucf:
voltage phase minus phase
crest factor
Acf:
current crest factor
• Phases: Some alarm conditions have a phase selection. W, VAR, and
VA, have a choice of "3L" or each individual phase, or "Sum" which is
the sum of phases. DPF, PF, and TAN have the choice of "3L" or each
individual phase, or "Mean" which is the mean of phases.
• Threshold: The value that must be reached to start an alarm. For ">"
alarms, the value or higher must be reached, for "<" alarms, the value or
lower must be reached.
• Duration: The Alarm will only be recorded if the duration of the parameter
meeting the threshold criteria exceeds the duration. The minimum alarm
duration can be in minutes or seconds. In the case of Vrms, Urms or
Arms not using neutral current, can also be in hundredths of a second.
For Vrms, Urms, and Arms, it can be useful to set a duration of 0 seconds.
In that case an event as short as a half cycle can be detected (8 millisec-
onds at 60Hz). For all other parameters, the minimum duration that can
be detected is 1 second.
You can check for alarms, records and search for transients at the same
time.
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Vunb: v oltage unbalance
Aunb: current unbalance
Hz:
frequency
Akf: current K factor
Vthd: voltage total harmonic distortion
Uthd: voltage phase minus phase total
harmonic distortion
Athd: current total harmonic distortion
W:
active power
Power Quality Analyzer Model 3945-B
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