GIS Partial Discharge Test System with Low Background Noise, High Voltage AC Hipot Test Equipment for GIS GIL Transformer and Switchgear

The GIS Partial Discharge Test System is designed for sensitive insulation diagnostics where low background noise and reliable PD measurement are critical.

Partial discharge can be caused by defects such as metallic particles, insulation damage, surface contamination, protrusions, floating electrodes and other localized insulation problems.

The system combines high-voltage AC excitation with a PD measurement chain for detecting and analyzing discharge activity.

• Partial discharge measurement
• AC withstand voltage test
• PD inception voltage
• PD extinction voltage
• PD magnitude measurement
• Phase-resolved PD pattern
• Noise identification
• Digital data acquisition
• Waveform recording
• Test report generation

Low background noise is particularly important when measuring small PD signals.

Industry GIS systems emphasize low PD background, with some systems specifying values below 10 pC or even lower depending on configuration and test conditions.

• GIS
• GIL
• Transformers
• Instrument transformers
• Switchgear
• Bushings
• Insulators
• Cables

PD signal is too weak

The measurement system should have appropriate sensitivity, shielding, grounding and filtering.

Too much external interference

The testing environment, grounding arrangement, coupling method and measurement bandwidth all influence PD measurement quality.

Customer needs repeatable test results

Digital acquisition and standardized test procedures can improve repeatability.