Dynamometric 1ph / 3ph Power & 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.


FEATURES
• SCALE Linear, Side zero or Center zero are available.
• HOUSING Sheet Metal (Black painted).
• TERMINAL PROTECTION Shrouded terminals to protect from accident, (on request).
• GLASS Anti - glare (on request)

ELECTRICAL SPECIFICATIONS
• TYPE Dynamometric.
• OPERATING VOLTAGE 75V to 500V for 1 Ph. 110V / 440V - PT secondary for 3Ph.
  BURDEN <1.25VA upto 75V, <2.5VA - 100V to 150V, < 5VA - 200V to 300V,
<10 VA - 350V to 600V
• OPERATING CURRENT 0.5A to 10A for 1 Ph. 1A/5A-CT secondary for 3Ph
  BURDEN <5VA upto 5A, <10VA upto 10A.
• FREQUENCY 45 ~ 65Hz. (400Hz. on request).
• ACCURACY Class 1.5 for Watt / Var / VA. 2° for PF.
• DIELECTRIC TEST 2kV RMS for 1 minute.
• OVERLOAD CONTINUOUS 1.2 times
• OERLOAD SHORT TIME 2 times VN / 10 times IN for 5 seconds.
• OPERATING TEMP. -10°C to 55°C
• STORAGE TEMP. -20°C to 70°C
• HUMIDITY up to 95% RH
• 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 - -

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 - -
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 - -

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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