HET 250kVA/25kV Exciter Transformer – Reliable High-Voltage Testing Solution

The HET 250kVA/25kV,12.5kV Exciter Transformer is a specialized high-voltage testing device designed for industrial applications requiring precise voltage regulation and robust safety features. With advanced insulation, electrostatic shielding, and ONAN cooling, this transformer ensures reliable performance in demanding electrical testing environments.

Key Specifications

• Rated Capacity: 250kVA

• Phase: Single-phase

• Cooling Method: ONAN (Oil Natural Air Natural)

• Rated Voltage: LV: 0.6kV / HV: 12.5kV, 25kV

• Rated Current: LV: 416.6A / HV: 20A (25kV), 10A (12.5kV)

• Frequency: 50Hz

• Impedance Voltage: <4%

Advanced Safety & Protection Features

To ensure operator safety and equipment durability, the HET Exciter Transformer includes:

• Electrostatic Shielding: A dedicated shield layer between HV windings prevents voltage leakage.

• Piezoresistor Protection: Each HV output is equipped with a piezoresistor for overvoltage suppression.

• Grounding via Zinc Oxide Arresters: Input and output terminals are grounded to protect against breakdowns.

• Corona-Free Design: HV bushings with corona rings ensure stable 25kV operation.

Structural Design & Insulation

The transformer’s construction enhances durability and performance:

• Steel Housing: Robust enclosure with wheels for mobility.

• Oil Tank Design: Shell-type oil tank with a conservator to maintain insulation integrity.

• Bushing Insulation: HV bushings use fiberglass with isovolumetric capacitance cores.

• Winding Structure: Cylinder-type winding with electrostatic shielding for uniform voltage distribution.

• Partial Discharge Reduction: Compound insulation tube minimizes discharge and shields the iron core.

Applications

This exciter transformer is ideal for:

• High-voltage laboratory testing

• Power equipment validation

• Industrial electrical safety testing

• Transformer and cable withstand voltage tests

Conclusion

The HET 250kVA/25kV Exciter Transformer combines precision engineering with advanced safety mechanisms, making it a dependable choice for high-voltage testing applications. Its robust insulation, shielding, and cooling systems ensure long-term reliability in critical electrical testing environments.