Partial discharge (PD) is a proven precursor to insulation failure in cables, transformers, switchgear, and rotating machines — and it can be detected long before failure occurs. Green Watt's PD detection service surveys energised HV equipment in service, identifying and locating PD sources without any interruption to supply.
Service Scope
Cable PD Surveys
- ›HFCT sensors clamped onto cable earth conductors for non-invasive detection
- ›PD pulse propagation analysis along the cable
- ›Defect location by time-domain reflectometry
Switchgear & Transformer Surveys
- ›TEV (Transient Earth Voltage) surface contact sensors for metal-clad switchgear
- ›UHF coupler sensors for GIS and large power transformers
- ›Acoustic/ultrasonic sensors for airborne PD source location
Advanced Diagnostics
- ›Phase-Resolved PD Pattern (PRPD) analysis for defect classification
- ›Floating discharge, void discharge, and surface discharge identification
- ›Severity assessment and remaining life estimation where applicable
What You Receive
- Phase-resolved PD pattern plots for each measurement point
- Defect classification and severity assessment
- Estimated remaining life where standard assessment criteria apply
- Prioritised action list: immediate, within 12 months, monitor
Why Choose Green Watt Field Services
✓Qualified electrical engineers with HV testing experience
✓Calibrated instruments traceable to national standards
✓Comprehensive written reports with photographs
✓Rapid mobilisation across India
✓Independent third-party assessment
✓Pan-India service coverage
Request a Service Proposal
Tell us about your site and requirements. We'll respond with a service scope and fee proposal within one working day.
Contact UsAll Services
Coverage
Delhi NCR, Maharashtra, Karnataka, Tamil Nadu, Gujarat, Eastern India and all major industrial centres.