Digital Power Meter - MWH / MKH

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Model MWH & MKH series, programmable watthour, varhour meters, is specially designed for solving the variables of CT & PT Ratio only with simple setting process. The unit applies time division multiplier principle of an accurae converting function for real power detection which able to measure a distorted waveform of input power. Pulse generation uses crystal heart of V-F conversion as analog to digital conditioning. The detail features of the unit with:

 

  1. 7 digits counter of long accumulation capability.
  2. Programmable CT*PT ratio: 3 first PT*CT ratio effective digits, setting range 0-999.
  3. Single/dual display alley: single only for forward power of watthour. Dual alley for forward & reversed status for watthour series, leading & lagging status for Varhour series.
  4. Switchable for engineering unit selection of KWH or MWH annunciatiors.
  5. Selectable decimal point to go with proper range & resolution ofr display reading.
  6. Two LED annunciators indicating power flowing status, forward or reversed for wh, leading or lagging for varh.
  7. Designed specifications following: ANSI-IEEE & IEC, VDE standards providing full protection.
Digital Power Meter - MWH / MKH

 

Features
  • Programmable for PT & CT ratio
  • True power system design compliants: ANSI-IEEE, IEC & VED standards
  • High over capability
  • 7 digits counter
  • High accuracy of 0.5% & o.2%
  • Distorted waveform signal measurement
  • Display with super rate LED
Model & Ordering

      
Specification
  • Accuracy (23 + 3oC) :
    • 0.4% rd / PF + 0.1%fs : MWHX, MWHY,MWHZ, MWHQ, MWHXD, MWHYD, MWHZD, MWHQD, MKHXD, MKHYD, MKHZD, MKHQD
    • 0.2% rd / PF + 0.02%fs: MWHX2, MWHY2, MWHZ2, MWHQ2, MKHXD2, MWHYD2, MWHZD2, MWHQD2, MKHXD2, MKHYD2, MKHZD2, MKHQD2 ( PF=COSØ For wh version, PF=SINØ for varh version.)
  • Output pulse :
    • Photo couple isolator, open colector 30V, 50mA maximum
  • Ratio setting :
    • PT*CT Ratio setting of 3 first effective digits, normal range 0-999
  • Stability :
    • Temperature coefficient < 70 ppm wh version, < 100 ppm varh version per degree C, long term draft maximum
  • Digits & counts :
    • 7 digits 9999999 counts maximum
  • Display :
    • 0.3" super rate LED
    • Single alley for MWHX, MWHY,MWHZ, MWHQ, MWHX2, MWHY2, MWHZ2, MWHQ2
    • Dual alley for MWHXD, MWHYD, MWHZD, MWHQD, MWHXD2, MWHYD2, M2HZD2, MWHQD2, MKHXD2, MKHYD2, MKHZD2, MKHQD2
  • Response time :
    • Conversional rate less 0.4 sec typically
  • Input burden :
    • 0.25VA maximum per imput element
  • 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
  • Creat factor :
    • Normally < 3, MWH series only
  • Waveform :
    • 3rd 30% watthours only, simusoidal wave for varhouts version only
  • Frequency :
    • 50 or 60 + 5Hz for watthours version.
    • 50 / 60 Hz for Varhours version ( 50/60 + 0.5 Hz -- less 0.002 change per 0.1 Hz change )
  • Dielectric strength :
    • 2.5 KV rms / 1 minute, all terminals to reference ground
    • 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 & 1MHz-0.25 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