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HET 500kVA/25kV Exciter Transformer | Triple-Tap Testing (3-25kV) with <5pC Partial Discharge

The HET 500kVA/25kV Exciter Transformer features three voltage taps (3-25kV), manual tap-changing, <5pC partial discharge, and 25kV corona-free operation for precision high-voltage testing.

US$ 26,722.00
Lead time: 30 days

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Product Details

Product Tags

HET 500kVA/25kV Exciter Transformer - Triple-Tap Testing Solution

The HET 500kVA/25kV,12.5kV,3kV Exciter Transformer delivers flexible high-voltage testing with three manual-selectable outputs, ultra-low partial discharge (<5pC), and robust protection systems for industrial applications.

Technical Specifications

Parameter	Specification
Rated Capacity	500kVA
Input Voltage	3kV
Input Current	105.3A
Output Voltage Taps	3kV (Tap I), 12.5kV (Tap II), 25kV (Tap III)
Output Currents	166.7A (3kV), 40A (12.5kV), 20A (25kV)
Frequency	50Hz
Impedance Voltage	<5%
Cooling Method	ONAN (Oil Natural Air Natural)
Insulation Level	1.1× rated voltage for 1 minute
Partial Discharge	<5pC at rated voltage

Key Design Features

Tap-Changing System

Manual Tap Selection: Three-position tap changer (3kV/12.5kV/25kV)
High-Current Capability: 166.7A at 3kV for heavy-load testing
Electrostatic Shielding: Cylinder-type windings with balanced voltage distribution

Safety & Protection

Dual-Protection System:

Piezoresistor arrays on all HV outputs
Zinc oxide arresters (IEEE C62.11 compliant)

25kV Corona-Free: Fiberglass bushings with isovolumetric capacitance cores
Flashover Prevention: Turn-to-turn insulation withstands 110% voltage surges

Structural Advantages

Mobile Platform: Wheel-mounted steel enclosure with shell-type oil tank
Advanced Bushings:

Porcelain LV bushings (IEC 60137)
Dual-corona-ring HV bushings

Oil Management: Conservator with temperature-compensated level indicator

Performance Benefits

Three Test Ranges

3kV to 25kV coverage in one system

Precision Measurement

<5pC partial discharge for accurate diagnostics

High Current Output

166.7A capacity at 3kV tap

Robust Insulation

1.1× rated voltage withstand capability

Typical Applications

Power transformer routine testing
Cable withstand voltage tests
Industrial equipment validation
High-voltage research experiments

Standards Compliance

IEC 60076 (Power Transformers)
IEEE C57.12.00 (General Requirements)
EN 60296 (Transformer Oil Standards)

Why Choose This Transformer?

Tap-Changing Flexibility: Three voltage ranges from single input
Industrial-Grade Accuracy: <5pC partial discharge capability
Safety Redundancy: Dual protection systems
Field-Ready Design: Wheeled base for site mobility

Conclusion

The HET 500kVA/25kV Exciter Transformer provides unmatched testing versatility with its triple-tap design, combining high-current capacity at 3kV with precision 25kV testing capabilities in a single robust package.