User Manual

Figure 23: The Choice of coefﬁcients of calculation of the K factor menu

Use the arrow keys (,, , ) 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.

Then validate with the



key. The device returns to the Conﬁguration menu.

Note: The modiﬁcation is impossible if the device is recording and/or searching for alarms (for the C.A 8333 only).

4.5.3. CHOICE OF REFERENCE OF THE LEVEL OF HARMONICS OF THE PHASES

The %f-%r menu deﬁnes the reference for the level of harmonics of the phases.

4.5.2. CHOICE OF COEFFICIENTS OF CALCULATION OF THE K FACTOR

The FK menu deﬁnes the coefﬁcients used for the calculation of the K factor.

Figure 24: The Choice of Reference for the Level of Harmonics menu

Use the arrow keys (,) to ﬁx the reference for the level of harmonics:

 %f: the reference is the value of the fundamental.

 %r: the reference is the total value.

Then validate with the



key. The device returns to the Conﬁguration menu.

In the case of the level of harmonics of the V-h, A-h, and U-h phases, the fundamental and total values are RMS values. In the

case of the level of harmonics of the S-h phases, the fundamental and total values are apparent power values.

Note: The modiﬁcation is impossible if the device is recording and/or searching for alarms.