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 Active Power/Watt Transducers

 

Features: 
                                                                                                                                     

bullet Accuracy (+ or - 0.2% RO)
bullet Excellent long term stability (4-20ma, 500 ohm)
bullet Precision measurement even for unbalanced system
bullet Precision measurement even for distorted wave forms
bullet Measuring reverse watt is available
bullet High impulse & surge protection (5KV)
bullet The case can be mounted on a 35mm rail which complies with DIN 48277


DESCRIPTION

Model:  S3-WD-1 -    Single Phase 2 W, active power (WATT)
            S3-WD-3 -    Three Phase 3 W, active power (WATT)
            S3-WD-3A-   Three Phase 4 W, active power (WATT)

A wide range of transducers to measure all forms of active power, in both balanced
and unbalanced, single or 3 phase system.  They utilize the well prove "time division
multiplication" method of measuring instantaneous power over a wide range of input
waveforms.  The circuit diagram shown measured voltage is modulated by circuit of
an oscillator.  Square wave pulses from a multi-vibrator circuit, with a mark-space ratio
varied by the measured voltage and amplified by the measured current, are fed to an
integrator an output amplification circuit.  The dc signal produced is then directly
proportional to power input-Watts.

 

SPECIFICATION INPUT

 

Input Range

Max. Input
Over Capability

Circuit Amp Voltage Basic Watt Ampere:
3 x rated continuous
10 x rated 10 sec.
50 x rated 1 sec.

Voltage:
480V
Single Phase 5 Amp 110V(120V)
220V(240V)
0-0.5KW
0-1KW
Three Phase 5 Amp 110V(120V)
220V(240V)
0-1KW
0-2KW
Three Phase 5 Amp 190/110V
(208/120V)
0-1.5KW
DC Output Range Load
Resistance
Output
Resistance
Output
Ripple
Response
Time
0-1V > 1K Ohm < 0.05 Ohm < 0.5% RO
(Peak)
< 400mS
0-99%
0-5V
1-5V
0-10V
0-1mA 0-10K Ohm > 20M Ohm
0-10mA 0-1K Ohm  
0-20mA 0-500 Ohm 0-500 Ohm
4-20mA
Accuracy + or - 0.2% rated of Output
Input Frequency 50Hz (+ or -) 3Hz or 60Hz (+ or -) 3Hz
Input Burden <0.1VA (ampere input)
< 0.2VA (voltage input)
Aux. power supply AC 110V (+ or -) 15%, 50/60 Hz
AC 220V (+ or -) 15%, 50/60 Hz
DC 24V, 48V, 110V, (+ or -) 15%
Power consumption (<) 4VA, < DC 3W
Power effect (<) 0.1% RO
Waveform effect (<) 0.2% RO at distortion factor 15%
Output load effect (<) 0.05% RO
Electromagnetic
Balance effect
<0.1% RO
Mutual Interference effect <0.1% RO between element
Magnetic field strength (<) 0.2% RO, 400 A/M
Span adjustment (>) 5% RO
Zero adjustment (>) 1% RO
Operating temperature range 0-60 degrees C
Storage temperature range (-) 10-70 degrees C
Temperature coefficient (<) 100PPM from 0-60 deg. C
(<) 60 PPM, 25 deg. C (+ or -) 10 deg. C
Max. relative humidity 95%
Isolation Input/Output/Power/Case
Insulation resistance (>) 100M ohm, DC 500V
Dielectric withstand voltage
(IEC 414, 688, ANSI, C37)
Between input/output/power/case
ac 2.5kv, 60Hz, 1 min
Impulse withstand test
(IEC 255-4, ANSI, C37 90)
5 kv, 1.2 x 50 nS
common mode & differential mode
Performance Designed to comply with IEC688
Safety requirements IEC 414, BS5458

 

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