Hioki
ST4200 – Partial Discharge Detector
Overview
Why is partial discharge testing of motor windings necessary?
Deep inside the motor winding a tiny discharge appears, unseen but real. Each surge pulse fuels the damage, eroding the insulation from within. Cracks, carbonization…what begins as a faint spark can end in breakdown — or fire.
Insulation resistance and hipot tests? They find what’s already failed. Partial discharge starts long before — silent, cumulative, irreversible.
Partial discharge testing reveals what others can’t see: early degradation, hidden defects, the beginning of failure. Reliability starts before the fault.
The Hioki ST4200-50 delivers stable, reproducible measurements even in noisy production lines. Detect. Protect. Trust. Hioki — visualizing the hidden destruction.
Noise-Resistant PD Testing for Enhanced Motor Quality – The ST4200-50 Partial Discharge Detector offers comprehensive partial discharge (PD) detection. It also enables seamless system integration for motor production testing when paired with the SW2001 High Voltage Multiplexer. Furthermore, the ST4200-50’s PD detection uses high-frequency CTs which mitigate noise interference common to production lines.
Key Features
- Compatible with the SW2001 High Voltage Multiplexer
- Noise-resistance through high-frequency CT
- AC and Surge dual-mode partial discharge detection
