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Power Quality Analyzer Model 3945-B
APPENDIX B
GLOSSARY OF TERMS
Symbol Denition
F
Frequency
Vrms
Volts rms
Arms
Amps rms
W
Watts(RealPower)
PF
Power Factor
Urms
Volts(phase-to-phaserms)
Vthd
Volts total harmonic distortion
Athd
Amps total harmonic distortion
VARS
VARS(reactivepower)
DPF
Displacement power factor
Uthd
Voltstotalharmonicdistortion(phase-to-phase)
Vcf
Volts crest factor
Acf
Amps Crest Factor
VA
Volt-Amps(apparentpower)
Tan
Tangent(Volt-Amp)
Ucf
Voltscrestfactor(phase-to-phase)
Vunb
Volts Unbalanced.
On the instrument’s screen, the calculation
method is the IEC method that takes into account phase angle.
Aunb
Amps Unbalanced.
On the instrument’s screen, the calculation
method is the IEC method that takes into account phase angle.
PST
Shorttermicker
Akf
“K” factor
Vh
Harmonic volt
Ah
Harmonic amps
3L
Capture of each 3 phases
N
Neutralcurrent(calculated)
Σ
Sum of three-phase power capture