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POWER EQUIPMENTS
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Three-Phase Portable Precision
Digital Wattmeters |
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"DELTA" have been manufacturing
precision 3Ø portable digital wattmeters for very wide-range
of applications .These wattmeters offer not only very high resolution,
especially for low p.f. applications, butare useful for very wide
range of p.f.application. For 3Ø-3 Wire applications, two-element
wattmeter is used; for 3Ø-4 Wire applications, three-element
wattmeter is sed. Both have algebraic sum "TOTAL" readout
as well. In 3Ø-3 Wire applications, from W1& W2 readings,
very precise p.f. calculations can also be done.All of DELTA's digital
wattmeters are of TRUE-RMS type; these wattmeters are very useful
when the harmonics are present in the power to be measured. Some
of the typical applications are:
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- Motor testing from no-load to blocked-rotor test Distribution
transformers testing
- Audit of power-distribution points and major loads with the
use of external precision clamp-on C.T's
- Switchgear Testing
- Cross checking of wattmeters of lesser precision
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3Ø - 3 Wire |
3Ø - 4 Wire |
| Model |
3 WT-1A |
3WT-5A |
4WT-1A |
4WT-5A |
| Max.Inputs |
440 V/1A |
440 V/5A |
440 V/1A |
440 V/5A |
| Range |
0-762.0 W |
0-3810 W |
0-762.0 W |
0-3810 W |
| Resolution |
0.1 W |
1 W |
0.1 W |
1 W |
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Specifications
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| Aux.Supply : 230VAC±10% |
Display : 4½
digits, 0.5" LEDs |
| Accuracy : Class:
0.5 |
P.F. Range : ±0.1
to 1.0 |
| Enclosure :
COMTECH T-220 Attractive ABS Cabinet |
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| TOTAL ISOLATION BETWEEN VOLTAGE
/ CURRENT INPUTS |
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Peak voltage input :
not to exceed 1kV |
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Peak current input :
not exceed three times the rated input |
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P.F. Calculation for 3Ø-3
Wire : |
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Calculate "cosθ from tanθ =
W1-W2 / W1+W2, where 'W1' is greater of the two and +ve, W2 may +ve,'O'
0r-ve depending on the p.f. |
