TH2883 Series Operation Manual Chapter 2 General specifications
2-3
Figure 2-2 Differential Area Comparison
The differential area size reflects the value of inductance and total energy loss. This method is
especially effective to detect the differences of inductance L between the standard winding and
the tested winding.
2.2.3 Corona discharge comparison
When comparison method is set to Corona Discharge, TH2883 detects the high frequency energy
of corona discharge from A to B as shown in Figure 2-3. When the corona evaluation value is
less than the corona difference limit, then the comparison result will be PASS. When the corona
evaluation value is more than the corona difference limit, then the comparison result will be
FAIL. The corona evaluation value and difference limit are both expressed as an integer.
Figure 2-3 Corona Discharge Comparison
User can sample some coil samples (e.g. 10 samples) to set an effective corona discharge value.
First, applying an impulse voltage to each coil will gain the corona discharge value of each coil.
Then, a new effective value can be set by adding 20% to the maximum corona discharge value.
In order to ensure the correctness of the new value, user can test these coils once more and
observe the corona PASS or FAIL.
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