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.

 

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.