The SXPD Series Partial Discharge Free Variable Frequency Resonant Test System integrates advanced frequency-tuning and voltage-regulation technology with PD-free manufacturing processes. Engineered specifically for AC withstand testing and partial discharge (PD) measurement of power transformers, GIS switchgear, high-voltage reactors, and power cables, this system delivers unmatched precision and efficiency.

In Extra-High Voltage (EHV) and Ultra-High Voltage (UHV) power transmission networks, the insulation integrity of electrical equipment (such as power transformers, GIS, HV reactors, and power cables) directly dictates overall grid safety and stability. Traditional power-frequency withstand voltage tests can detect macro-insulation defects, but struggle to capture subtle Partial Discharge (PD) flaws, while requiring massive power supply capacity and heavy physical equipment.

The SXPD Series PD-Free Variable Frequency Resonant Test System successfully bridges the gap between high-voltage, large-capacity AC withstand testing and precision partial discharge measurement—both on-site and in laboratory environments. Featuring an ultra-low PD noise floor and online stepless frequency adjustment, it has become the preferred solution for utility operators, research institutes, and electrical manufacturers worldwide.

1. On-Line Stepless Frequency & Voltage Tuning
   Equipped with an advanced variable frequency power supply, frequency adjustment requires no power shutdown. Smooth, stepless online tuning quickly locates the system resonance point, significantly boosting test efficiency and operational safety.
2. Ultra-Low Partial Discharge Background Noise
   Utilizing specialized insulation structures and high-purity shielding technology, the system ensures negligible self-discharge even at maximum voltage outputs, delivering a pristine background environment for accurate PD signal detection.
3. Low Impedance & High Resistance to Pollution
   Features low system impedance (≤ 5%), effectively minimizing waveform distortion in the test loop and outputting a pure sine wave that meets strict requirements for AC artificial pollution tests.
4. Multiple Microsecond Electronic Protections
   Integrated with rapid electronic protection devices, offering overvoltage, overcurrent, flashover, and zero-start protections with microsecond-level response times to ensure maximum safety for operators and test objects.

• Power Engineering On-Site High-Voltage Testing: Suitable for commissioning and preventive maintenance AC withstand tests at newly constructed or retrofitted substations.
• 750kV Power Transformer PD & Induced Voltage Withstand Tests: Provides stable power to evaluate main and longitudinal insulation of large transformers.
• 1200kV Resonant Test Power Source: Widely applied in AC withstand and PD testing for 1000kV UHV switchgear (GIS/H-GIS).
• 500kV High-Voltage Shunt Reactors: Meets AC withstand and partial discharge measurement needs for HV reactors.
• DC Smoothing Reactor Resonant Tests: Fits critical testing requirements for UHVDC power transmission equipment.
• Electrical Equipment Manufacturing & R&D: Factory acceptance testing for instrument transformers, surge arresters, and bushings, as well as academic lab research.

The SXPD Series Partial Discharge Free Variable Frequency Resonant Test System represents cutting-edge technology in high-voltage electrical insulation testing. By combining a PD-free testing transformer with variable frequency resonant technology, it overcomes on-site power capacity limitations while maintaining high PD sensitivity and accuracy.

Whether for 750kV/1000kV UHV field testing or precision laboratory insulation research, this system offers a highly cost-effective and dependable solution.