Digital Power Meter - MWF / MKF

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Model MWF & MKF series, programmable watt & var meters, are specially designed for solving many variables of CT & PT Ratio problems & having very convenient performance in measuring active & reactive power. The unit uses Time division multiplier principle of a very acurate converting untion & also of a real power detection, able to measure distorted input signal.

 

The unit basically is a 4-1/2 digits design, under an efftive limitation for different phases & wires system the maximum defined reading ranges as following;

  1. 16000 counts-MWFZ/MWFZ2/MKFZ/MKFZ2/MWFQ/MWFQ2/MKFQ/MKFQ2............3 phase 4 wire system.
  2. 11000 counts-MWFY/MWFY2/MKFY/MKFY2............3 phase 4 wire system.
  3. 5500 counts-MWFX/MWFX2/MKFX/MKFX2............1 phase 2 wires system.

The ratio setting for PT x CT ratio of a digital type, first 3 effective digits selection, fits over 99% application in all systems. With proper unit annunciator & decimal selection, the unit can get a required primary reading without any recalibration process.

The designed specification follows ANSI-IEEE & IEC, VDE standards providing full protection for surge intrusion & unusual input over, assuring reliable operating.

Digital Power Meter - MWF / MKF

 

Features
  • Programmable for PT & CT ratio
  • True power system design compliants: ANSI-IEEE, IEC & VED standards
  • High over capability-assruing reliability
  • Effective display range of 5 to 4.5 digits
  • High accuracy of 0.5% & o.2%
  • Display with super rate LED
Model & Ordering

      
Specification
  • Accuracy (23 + 3oC) :
    • 0.5% fs or 20 cts. which ever great: MWFX, MWFY,MWFZ, MWFQ,MKFX,MKFY,MKFQ
    • 0.25% fs or 10 count: MWFX2, MWFY2, MWFZ2, MWFQ2, MKFY2, MKFZ4, MKFQ2
  • Stability :
    • Temperature coefficient < 80 ppm per degree C, long term draft < 0.2% per year
  • Digits & counts :
    • 4-4.5 digits: maximum counts 5500-1Ø2w, 11000-3Ø3w; 16000-3Ø3w, system
  • Display :
    • 0.8" super rate LED
  • Response time :
    • Sample rate 1 pf per sec typically, conversional time less 1 second
  • Input over :
    • Current input: 3 * rating-continuous, 10 * rating-30sec., 25 * rating-3sec.
    • Voltage input: maximum continuous 750V or 1.5 rating which ever great
  • Frequency :
    • 50 or 60 + 5Hz for Watt version
    • 50 or 60 5Hz for Var version ( 50/60 + 0.5 Hz -- less 0.002 change per 0.1 Hz change )
  • Creat factor :
    • Normally < 3, MWF.. series only
  • Waveform :
    • 3rd 30% for watt version only
  • Dielectric strength :
    • 2.5 KV rms / 1 minute, all terminals to reference ground (case)
    • 2 KV rms / 1 minute, input terminals to power terminals
  • Surge test :
    • ANSI C37.90 / 1989, IEC 255-3 (1989)
  • impulse voltage :
    • Impulse voltage 1.2 * 50 us 4 KV
    • Oscillating wave 0.5us-100KHz 3KV or 1MHz-0.25 ms 2.5 KV
  • Operating condition :
    • Operating temperature range -10 to 55oC, 0-99% RH non-condensed
  • Storage condition :
    • Storage -25 to 70oC, 20-99% RH non-condensed
  • Auxiliary power :
    • AC + 15% < 6 VA, DC + 20% < 6 watts