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Fluke 1743, 1744 THDI, Flicker, THD – Measuring Function P, Calculation of THD in Measuring Function P, THDV

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Power Quality Logger

Methods of Logging

Calculation of THD in Measuring Function PTHD – Measuring Function P

Function P does not measure harmonic values.

Voltages:THDV = VRMS 2 − V12

VRMS: RMS value of total signal

V1: RMS value of the fundamental

Currents: THDI = I RMS 2 − I12

IRMS: RMS value of the total signal.

I1: RMS value of the fundamental.

Note

THDI for currents < 5% of IE (measuring range) can have additional uncertainties, or can be suppressed.

Harmonics up to 50th order are taken into account.

Flicker

Flicker is the visual impression of unsteadiness in a light source whose luminance or spectral distribution changes over time. Flicker is logged in accordance with the IEC 61000-4-15 standard. The short-term (st) flicker Pstt is logged over a default standard interval of 10 minutes, and is used to calculate the long-term (lt) flicker Plt (by taking the sliding average of 12 short-term values). The interval value can be changed as needed in PQ Log.

Contents

Page Table of Contents 1744/1743 Contents Page List of Tables Page List of Figures Page Introduction Information and PC Software CD Logger Power Supply Power Interruptions Introduction to the Logging Functions Power Quality Logger Symbols Safety Instructions W X Warnings Qualified Personnel Standard Equipment and Optional Accessories Page Features Page Power Network Configurations Working with Logged Data Using the Logger Logging Jobs Preparing the Logger for Use 2.Connect the RS232 interface cable to the serial port of your PC Test Leads – Markings Connecting Current Probes Connecting the Logger Page Page Connections in 3-Phase 4-Wire(Wye) Systems Connections in 3-Phase 3-Wire(Delta) Systems Figure 5 shows the connections for logging 3-phase 3-wire(Delta) systems The test lead N can be left open, or connected to ground potential Connections for Single-PhaseLogging Figure 6 shows the connections for logging single-phasesystems Connections for Medium-VoltageNetworks Phase-PhaseDelta Logging Phase-Ground, Wye-Logging Logging with Two Voltage Converters and Two Current Transformers Logging Time-activated Immediate job: Completing the Logging Job For switch-activated Methods of Logging Measuring Ranges Resolution Accuracy Voltage Variations Min/Max Values Voltage Interruptions Voltage Harmonics Current Harmonics THDV THDI and THDI (A) = ∑ In THDI 12Pst Plt = 3 ∑ 12i=1 Power Logger Parameters with Function P PF = λ tanϕ tanϕ total Logger Parameters with Function A Pn = Vn .In .cosϕ n Page tanϕ ⋅ ∑ Ph1 Sh1 cosϕ Sh1 Qh1 cosϕ 1total Maintenance Lithium Battery Disposal Technical Specifications Logging Parameters – Overview Technical Specifications Maximum Number of Intervals for Logging Function P General Information Environmental Specifications EMC Power Supply Measurement Input Voltage Current Input with Flexi Set Current Input for Clamp General Specifications Power (Logging Functions A, P only) P, S, |P| Harmonics Vm, Im, THDV, THDI per IEC/EN 61000-4-7,class B Statistics Analysis of logging data Logging Function P Logging Function A – “All” parameters Applications PQ Log PC Application Software Online Test ASCII Export Timeplot diagram UNIPEDE DISDIP Table Cumulative Frequency – Harmonics Index