Select products that include an ac Transducer function.
Please refer ac Input Conditioning for articles ac measurement.
Select products that include an ac Transducer function.
Please refer ac Input Conditioning for articles ac measurement.
An ac transducer is used to change an electrical quantity such as voltage, current, power or frequency into a proportional dc output.
By means of a transducer, a complex electrical quantity, such as watts, can be measured at a convenient location and converted into a load independent dc current signal for transmission over two wires over any distance for display, recording or control.
For remote indication of watts or vars, a transducer can reduce the number of signal wires to be laid between source and indicator from as many as nine to two.
Transducer output wires need only be insulated for low voltage and have small cross-sectional area. Such lines are easily run and effect savings in terms of cable costs and space occupied on cable trays and the connecting and terminating elements required.
Active Transducers : Active Transducers need an auxiliary power supply.
Passive Transducers : Passive Transducers are signal powered no auxiliary supply is needed.
Class 0.5 means : - inaccuracy of the transducer is less than 0.5% of the span. - non-linearity is less than 0.5% of the span. - ripple (peak-peak) is less than 0.5% of the span. - response time is less than 500 msec.
For a Power transducer we need for example:
For a 3 phase 100/5A CT and a 11kV/110V PT
W = √3 × 11kV × I × 100A = 1.905MW
if the transducer is calibrated at 5A input.
Alternatively we can calibrate at 2MW. In this case the current calibration is
I = ( 2M ÷ ( √3 × 11kV ) ) × ( 5 ÷ 100) = 1.905MW