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Active Power Transducer

Active Power Transducer

This transducer is used for measurement of Active Power for single phase (STE-A-3T) system as well as for 3-phase, 3-wire (STE-B-3T) system and 3-phase 4-wire (STE-C-3T) systems with balance and unbalanced load. They are suitable for measurement of both import and export of power. The output is a load independent DC current or voltage which is proportional to input power. The output can be connected directly to indicating instruments or to data transmission system.

Features Characteristics Technical Data Block Diagram


  • Available in accuracy class index - 0.2, 0.5, & 1.0

  • Withstands wide temperature variations.

  • VA burden on CT/PT very low. - < 0.5 VA

  • Wide range of Input / Output to meet National / International requirements.

  • Comply to revised IEC 688-1 standards.

  • Flexibility in auxiliary power supply requirements - A.C. / D.C.

  • Rugged and vibration resistant.

  • Withstands seismic test as per IEC 344-1974 for Nuclear Power Applications.

  • Available in dust proof sheet plastic enclosures suitable for Back panel / Din rail mounting.

  • Multiple outputs also available - upto 4.

  • High input / Output isolations - 4.0 KV.

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Technical Data

Measuring Range 0-0.8-1.2 Vn x In
Rated Input 110/415V AC, 1/5A AC
Input Frequency 50Hz +/- 10%
Internal Consumption < 0.5 VA for each input
< 4VA for ry voltage
Self Powered
Auxiliary Power Supply 110/240 V AC
12/24/48/110/220V DC
Self Powered
Nominal Output
0-2.5-5.0 mA DC
0-5mA DC / 4-20mA
10-0-10 mA DC
10-0-10 mA DC
Load Range (Ohms)
a) Current Output
b) Voltage Output

Max 15V/Iout
Min 5K Ohms
Residual A.C. Ripple < 1% (P-P)
Overload Capacity
a) Continuous
b) Momentary

1.2 Vn, 2.0 In
2.0 Vn for 1 sec.
20 In for 1 sec.
Accuracy Class 0.3/0.5/1.0
Response Time < 0.5 sec
Input - output Isolation 4 KV
Operating Temperature 0 - 50°C
Impulse Voltage Test Confirms to IEC 251- 5KV having waveform of 1.2/50 microseconds.
HF Interference Confirms to IEC 255-4
Environment Condition User group II as per IEC 60688
Configuration 1-Phase,3-Phase/3-wire,3-Phase/4-wire
Number of output 1, 2, 3

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Block Diagram

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