PARTIAL DISCHARGING TESTS

On submitting various windings produced at our plants to partial discharge testing in accordance with IEC 726, the test values obtained were constantly below 10 picocoulombs (pC). We guarantee our customers this level of partial discharge (also issuing related certification), provided that transformer assemblies respect the necessary dimensional and procedural parameters and, in particular, the distance between HV (high-voltage) and LV (low-volta- ge) windings and distances towards the ground circuit.

IMPULSE TESTS

We have submitted various transformers assembled with our windings to impulse tests in accordance with IEC 14-8 and have obtained positive results. The comment made ni the case of partial discharge tests applies also to this type of test, i.e. that the transformers must be assembled obser- ving the dimensional parameters.

ROUTINE TESTS

The windings may be supplied with a test report including the following items:

• Ratio test

• Resistance test

• Insulation test to ground and secondary circuits

• Induced-voltage (over-voltage) withstand test

• Partial-discharge test

24-MONTH WARRANTY

The windings are guaranteed for a period of 24 months from the date of delivery. The guarantee si governed by a separate contract undersigned by both parties.