Mica-epoxy tolerates PD by design. IR and PI minimums by family, surge testing for turn insulation, and the operate-monitor-rewind verdict.

ZnO varistor physics, the five defining voltages, routine and type tests, operating duty and thermal stability, and resistive leakage diagnostics.

Interruption at current zero and transient recovery voltage, micro-ohm and timing routine tests, the T10 to T100a duties, and disconnector classes.

Covered against shielded construction, water and electrical trees, routine PD on every length, VLF and tan delta field diagnostics, fault location.

Accuracy classes and the burden window, the two incompatible knee point definitions, transient sizing and remanence, and CVT ferroresonance.

The full factory routine sequence, ratio and resistance references, loss measurement, applied against induced voltage, IVPD and impulse comparison.