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4.5.2. UNITS OF ENERGY
The Wh Energy Unit menu defines the unit of display of energies.
1.
At the Non-Active Values screen (Figure 4-7), press the Wh function button to display the Energy Unit screen.
2.
Use the arrow buttons (, ) to select the unit:
■
Wh: watt-hour.
■
J: joule.
■
toe (nuclear): nuclear ton oil equivalent.
■
toe (non-nuclear): non-nuclear ton oil equivalent.
■
BTU: British Thermal Unit.
3.
Press to validate the selection and return to the Configuration menu.
4.5.3. K FACTOR
The FK menu defines the coefficients used for the calculation of Factor K.
1.
At the Non-Active Values screen, press the FK function button to display the Transformer Factor K screen.
2.
Use the arrow buttons (, , , ) to fix the value of coefficients q and e:
■
q: exponential constant that depends on the type of winding and the frequency. The value of q can range from 1.5 to 1.7.
The value of 1.7 is suitable for transformers having round or square conductors, in all types of winding. The value of 1.5
is suitable for those in which the low-voltage windings are in tape form.
■
e: ratio between the losses linked to eddy currents (at the fundamental frequency) and resistive losses (both evaluated at
the reference temperature). The value of e can range from 0.05 to 0.1.
The default values (q = 1.7 and e = 0.10) are suitable for most applications.
3.
Press to validate the selection and return to the Configuration menu.
NOTE: You cannot change this option when the instrument is recording and/or searching for alarms.
Figure 4-8
Figure 4-9
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