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- Accuracy:
4% rd ±0.1%fs
MWHX, MWHY, MWHZ, MWHQ, MWHXD, MWHYD, MWHZD, MWHQD, MKHXD,MKHYD,MKHZD,MKHQD0
0.2% rd ±0.02%fs
MWHX2, MWHY2, MWHZ2,MWHQ2, MWHXD2, MWHYD2,
MWHZD2, MWHQd2, MKHXD2, MKHYD2, MKHZD2,MKHQD2)
- Output pulse: Photocouple isolator, open colector 30V, 50mAmaximum
- PTxCT Ratio setting of 3 first effective digits, normal range 0-999
- Temperature coefficient: < 70 ppm wh version, < 100 ppm varh per degree C
- Seven (7) digits 9999999 counts maximum
- Display: 0.3"super rated LED
- Conversional rate less 0.4 sec typically
- Current Over Range: 3 X rating-continuous, 10X rating-30sec, 25X rating-3sec.
- Voltage Over Range: maximum continuous 750V or 1.5X rating
- Frequency Watt version: 50 or 60 ±5 Hz for watthours version
- Var version: Norminal 50/60 hz for Varhours version (50/60 ±.5 Hz--less 0.002 change per 0.1 Hz change)
- Dielectric strength: 2.5 kvrms/ 1 minute, (case)
- 2 kvrms/ 1 minute, input terminals to power terminals
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The MWH & MKH series are programmable watthour and varhour meters, designed to solve for variable CT & PT Ratios. A crystal based pulse generator is the heart of V-F conversion system from analog to digital conditioning.
7 digits counter
Programmable CT and PT ratio:
3 first PT/CT ratio effective digits, setting range 0-999.
Single/dual display :
single only for forward power of watthour.
Dual for forward & reversed status for watthour series, l
ead & lag status for Varhour series.
Switchable for engineering unit selection of KWH or MWH annunciatiors.
Selectable decimal point for range , resolution or display reading.
Two LED annunciators indicating power flowing status, forward or reverse for wh, lead or lag for varh. |
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| Range: |
| Accuracy (23 + 3°C): |
.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 |
| Digits & counts: |
digits 9999999 counts maximum |
| Display : |
0.3" super rate LED |
| Response time : |
Conversional rate less 0.4 sec typically |
| Input burden : |
0.25VA maximum per imput element |
| input Overload: |
Current input 3 * rating-continuous, 10 * rating-30sec., 25 * rating-3sec.
Voltage input maximum continuous 750V or 1.5 rating, which ever great |
| Frequency Watt version : |
50 or 60 + 5Hz for watthours version.
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| Frequency Var version : |
50 / 60 Hz for Varhours version ( 50/60 + 0.5 Hz -- less 0.002 change per 0.1 Hz change ) |
| Crest factor |
Normally ≤ 3, MWH series only |
| Waveform |
3rd 30% for watt version only |
| 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: |
1.2 * 50 us 4 KV |
| Oscillating wave : |
0.5us-100KHz 3KV & 1MHz-0.25 2.5 KV |
| Operating condition |
Operating temperature :
-10 to 55°C, 0-99% RH non-condensed
Storage:
-25 to 70°C, 20-99% RH non-condensed |
| Auxiliary power AC / DC version: |
AC + 15% < 6 VA, DC + 20% < 6 watts |
| Applied rules and standards |
| Measuring & conversion: |
IEC 688 |
| Dielectric strength: |
IEC 688
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| Impulse & Surge test: |
ANSI C37.90.1/1989
IEC 255-3 (1989) |
| Adaptability-power system: |
IEC 0110 |
| Measuring reliability: |
VDE 3540 |
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 General Specifications |
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