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Dynamometric 1Ph And 3Ph Power And Power Factor Meter |
DESCRIPTION |
Dynamometric instruments are used for measurement of active, reactive & absolute power in 1 Phase & 3 Phase systems for balanced / unbalanced load conditions. Watt, Var & VA instruments incorporate current coils, connected in series with the load & pressure coils connected across the load. These instruments work on "Air cored Electro-Dynamometric" principle.
Power Factor meter incorporates two pressure coils, one with non-inductive resistance in series & other with capacitance in series & are cross connected. The deflecting torque produced is proportional to the phase angle between current & voltage vectors. The pointer rests anywhere on the scale when meter is not connected in the circuit, as there is no controlling torque.
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FEATURES |
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SCALE |
Linear, Side zero or Center zero are available. |
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HOUSING |
Sheet Metal (Black painted). |
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TERMINAL PROTECTION |
Shrouded terminals to protect from accident, (on request). |
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GLASS |
Anti - glare (on request) |
ELECTRICAL SPECIFICATIONS |
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TYPE |
Dynamometric. |
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OPERATING VOLTAGE |
75V to 500V for 1 Ph. 110V / 440V - PT secondary for 3Ph. |
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BURDEN |
<1.25VA upto 75V, <2.5VA - 100V to 150V, < 5VA - 200V to 300V,
<10 VA - 350V to 600V |
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OPERATING CURRENT |
0.5A to 10A for 1 Ph. 1A/5A-CT secondary for 3Ph |
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BURDEN |
<5VA upto 5A, <10VA upto 10A. |
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FREQUENCY |
45 ~ 65Hz. (400Hz. on request). |
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ACCURACY |
Class 1.5 for Watt / Var / VA. 2° for PF. |
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DIELECTRIC TEST |
2kV RMS for 1 minute. |
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OVERLOAD CONTINUOUS |
1.2 times |
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OERLOAD SHORT TIME |
2 times VN / 10 times IN for 5 seconds. |
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OPERATING TEMP. |
-10°C to 55°C |
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STORAGE TEMP. |
-20°C to 70°C |
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HUMIDITY |
up to 95% RH |
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CONFORMS TO |
I.S. 1248 / I.E.C. 60051 (Part 3) for WATT / VAR & (Part 5) for PF. |
MECHANICAL SPECIFICATIONS |
SIZE (mm) |
DEPTH (mm) |
PANEL CUTOUT (mm) |
SCALE LENGTH (mm) |
WEIGHT (gms.) |
96 x 96 1 ph or 3 ph |
See table 1 |
92 x 92+0.8 |
80 (approx.) |
See table 2 |
144 x 144 1ph or 3 ph |
138 x 138+1.0 |
140 (approx.) |
Table no. 1 (For Depth in mm) |
Parameter |
WATT METER |
VAR METER |
VA METER |
PF METER |
1PH |
3P1E |
3P2E |
3P3E |
1PH |
3P1E |
3P2E |
3P3E |
1PH |
3P1E |
3P2E |
3P3E |
1PH |
3P1E |
3P2E |
3P3E |
96 x 96 |
80 |
80 |
100 |
100 |
- |
- |
100 |
- |
80 |
- |
100 |
- |
80 |
80 |
- |
- |
144 x 144 |
85 |
85 |
125 |
165 |
- |
- |
125 |
165 |
85 |
- |
125 |
165 |
125 |
125 |
- |
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Table no. 2 (For Weight in approx. kg) |
Parameter |
WATT METER |
VAR METER |
VA METER |
PF METER |
1PH |
3P1E |
3P2E |
3P3E |
1PH |
3P1E |
3P2E |
3P3E |
1PH |
3P1E |
3P2E |
3P3E |
1PH |
3P1E |
3P2E |
3P3E |
96 x 96 |
0.5 |
0.5 |
0.7 |
0.7 |
- |
- |
0.7 |
- |
0.5 |
- |
0.8 |
- |
0.6 |
0.7 |
- |
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144 x 144 |
1.0 |
1.0 |
1.4 |
1.7 |
- |
- |
1.4 |
1.8 |
1.8 |
- |
1.5 |
1.8 |
1.2 |
1.4 |
- |
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Note : The connection diagram label is affixed on each meter. |
Ordering information |
1) Type 2) Size, 3) Parameter, 4) Phase & Element and Range 5) Operating Voltage & PTR
6) Operating Current & CTR. |
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