AC Resonant Test Systems: Precision High-Voltage Testing with Minimal Risk

Engineered for stress testing high-capacitance equipment like power cables, transformers, GIS, and generators, AC resonant systems generate high voltages with ultra-low power consumption while preventing catastrophic damage to test objects during insulation failures.

Core Advantages vs. Conventional Test Methods

Critical Applications

• Cable Commissioning: Frequency-tuned testing up to 500kV

• Transformer Acceptance: Inductance-compensated tests (e.g., 400MVA units)

• GIS/Switchgear: Sweep frequency response analysis (SFRA)

• Rotating Machines: Stator winding insulation integrity

• Research Labs: Dielectric loss testing with precision

How Resonance Enables Safe Testing

1. Tuned Circuit

• Matches system inductance (L) to test object capacitance (C) at 50/60Hz

• Generates high voltages from low input power: $V_{out}=Q\times V_{in}$ (Q=20-150)

2. Fail-Safe Protection

   When breakdown occurs, resonance collapses instantly, limiting fault energy to <10J – 1000× lower than conventional test sets.

Technical Specifications (Typical System)

Why Engineers Choose Resonant Testing

1. Cost Reduction

• 90% lower generator/fuel costs for field tests

• No equipment damage → zero replacement costs

2. Diagnostic Confidence

• Pure sine waves enable PDIV/RIV measurements

• Reliable tan δ monitoring for insulation health

3. Future-Proof Safety

• Meets EU/NA arc-flash safety directives

• SIL-3 rated protection circuits

Example: Testing 220kV XLPE cable (2µF capacitance):

• Conventional set: Requires 2,000kVA generator

• Resonant system: Only 200kVA generator needed

•