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Dynamometric 1Ph or 3 Ph Power & Power Factor Meter
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, which are connected in series with the load & pressure coils of fine wire gauge, which are 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 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.
Features
Scale
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Linear. Side zero or center zero are available.
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Housing
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Sheet Metal (Black painted).
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Terminal Protection
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Shrouded terminals to protect from accident. (on request).
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Electrical Specifications
Type
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Dynamometric.
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Operating Voltage
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75V to 500V for 1Ph. 110V / 440V - PT secondary for 3Ph.
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Burden
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<1.25VA up to 75V, <2.5VA 100V to 150V, <5VA 200V to 300V<10VA 350V to 600V
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Operating Current
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0.5A to 10A for 1Ph. 1A / 5A - CT secondary for 3Ph.
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Burden
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<5VA up to 5A, <10VA up to 10A.
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Frequency
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45 ~ 65Hz. (400Hz. on request).
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Accuracy
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Class 1.5 for Watt / Var / Va. 2o for PF.
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Insulation Resistance
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Greater than 20M Ω at 500V.DC
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Dielectric Test
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2kV RMS for 1 minute.
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Overload Continuous
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1.2 times
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Overload Short Time
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2 time VN/10 times IN for 5 seconds.
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Operating Temp.
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-10oC to 55oC
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Storage Temp.
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-20oC to 70oC
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Humidity
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Up to 95% RH
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Conforms To
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I.S. 1248 / I.E.C. 60051 (Part 3) for WATT / VAR, (Part 5) for PF.
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Mechanical Specifications
Size
(mm)
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Depth
(mm)
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Panel Cutout
(mm)
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Scale Length
(mm)
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Weight
(gms.)
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96 x 96 1Ph or 3Ph
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See Table 1
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92 x 92 +0.8
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80 (approx.)
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See Table 2
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144 x 144 1Ph or 3Ph
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138 x 138 +1.0
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140 (approx.)
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Table No. 1 (For Depth : in mm)
Para-meter
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Watt Meter
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Var Meter
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VA Meter
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PF Meter
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1PH
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3P1E
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3P2E
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3P3E
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1PH
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3P1E
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3P2E
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3P3E
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1PH
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3P1E
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3P2E
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3P3E
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1PH
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3P1E
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3P2E
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3P3E
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96 x 96
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80
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80
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100
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100
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-
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-
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100
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-
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80
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-
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100
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-
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80
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80
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-
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-
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144 x 144
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85
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85
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125
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165
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-
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-
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125
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165
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85
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-
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125
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165
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125
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125
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-
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-
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Table No. 2 (For Weight : in approx. kg)
Para-meter
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Watt Meter
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Var Meter
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VA Meter
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PF Meter
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1PH
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3P1E
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3P2E
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3P3E
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1PH
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3P1E
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3P2E
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3P3E
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1PH
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3P1E
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3P2E
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3P3E
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1PH
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3P1E
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3P2E
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3P3E
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96 x 96
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0.5
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0.5
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0.7
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0.7
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-
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-
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0.7
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-
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0.5
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-
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0.8
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-
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0.6
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0.7
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-
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-
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144 x 144
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1.0
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1.0
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1.4
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1.7
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-
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-
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1.4
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1.8
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1.8
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-
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1.5
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1.8
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1.2
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1.4
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-
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-
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Note : The connection diagram label is affixed on each meter.
Ordering information
- Type
- Size, Parameter, Phase & Element and Range
- Operating Voltage & PTR
- Operating Current & CTR
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