Transformer bushing failures sometimes occur outside the capacitive layers, where traditional analysis of leakage currents may not give indication of an internal problem.

When the utmost in transformer reliability is required for critical transformer assets, partial discharge detection must be part of the monitoring strategy. The TransMAX 2000 performs all the test methods of the ZVCM-1001m and also monitors for partial discharge (PD). The PD activity in the bushings is monitored in parallel with the power factor calculations.