A control power transformer steps down MV/LV supply to low voltages (typically 24-120 V) for relays, protection schemes, PLCs, and auxiliary circuits. It provides isolation and stable regulation during voltage fluctuations, ensuring reliable automation and safety systems.

To calculate the load power factor of a transformer, you measure real power P (kW) and apparent power S (kVA) at its terminals and then compute PF = P / S. Real power is obtained from wattmeters or power quality analyzers, and apparent power from voltage and current measurements. For three phase, S = ?3 × V × I. If the transformer is lightly loaded, power factor can be very low because magnetizing current dominates. It is important to distinguish this load PF from insulation power factor used in dielectric testing.

After regeneration, dielectric strength typically increases from around 30 kV to approximately 70 kV, demonstrating a profound improvement in the oil’s capacity to withstand electrical stress.

Corona in a transformer is a form of partial discharge in gas-filled voids or at sharp electric field gradients, typically in oil, paper interfaces, or at conductor edges. It occurs when the local electric field exceeds the ionization threshold of the surrounding medium, creating micro-discharges without a full breakdown. Over time, corona produces hydrogen, ozone, and acidic byproducts, degrades paper surfaces, and accelerates insulation aging. It is often an early-stage defect that does not trip protection immediately but shows up clearly in hydrogen DGA trends and acoustic/PD measurements.

400 Hz transformers are used in aviation, aerospace, military ground-power units, and shipboard systems because higher frequency reduces transformer size and weight. They support avionics, radar, communications, and aircraft auxiliary power units. Although not typical utility grid equipment, they are still power transformers optimized for reduced core volume and tight thermal limits under airborne or naval constraints.

Portable oil purification units from 0.6 to 6 m³/h are available in trailer-mounted or frame-mounted configurations. They remove water, gases, and solid impurities from transformer oil. Technical data and pricing will be shared.

The CMM-MSD is an online dielectric oil drying and moisture removal unit that operates directly on energized transformers. It maintains oil dryness and dielectric strength during operation. We will prepare a quotation with delivery details.

A cold trap condenses water vapor in vacuum drying setups. GlobeCore uses cold trap technology in its vacuum drying ovens to ensure complete moisture removal during transformer core and winding drying.

IEC 60156 requires BDV ?60-70 kV for new oils. Used oils often fall below. GlobeCore vacuum dehydrators and filters restore dielectric strength by removing water, dissolved gases, and sludge.