GE P642 Technical Manual page 188

Chapter 7 - Transformer Condition Monitoring P64x
The relationship of the output current to the value of the measured values is of vital importance and needs careful
consideration. Any receiving equipment must be used within its rating but, if possible, you should apply some kind
of standard.
One of the objectives is to monitor the voltage over a range of values, so you need an upper limit, for example
120%. However, this may lead to difficulties when it comes to scaling an instrument.
The same considerations apply to current transducer outputs and with added complexity to power transducers
outputs, where both the voltage and current transformer ratios must be taken into account.
Some of these difficulties do not need to be considered if the transducer is only feeding, for example, a SCADA
outstation. Any equipment, which can be programmed to apply a scaling factor to individual inputs can
accommodate most signals. The main consideration is to ensure that the transducer is capable of providing a
signal right up to the full-scale value of the input.
164 P64x-TM-EN-1.3