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D22 Digital Partial Discharge Detector

The D22 is a portable partial discharge diagnostic instrument used to detect insulation deterioration in cables, transformers, switchgear, motors, generators, and terminations. It identifies internal discharge, surface discharge, corona activity, loose connections and insulation breakdown patterns before failure occurs — enabling predictive maintenance and downtime prevention.

Key Features

  • Portable on-site PD testing for substations, plants & cable networks

  • Detects internal PD, surface discharge, corona, tracking & insulation aging

  • Real-time waveform display with phase-resolved PD pattern (PRPD) analysis

  • Filters out background noise for reliable PD detection in live environments

  • Supports high-frequency current transformer (HFCT) sensors for cable testing

  • Optional acoustic & ultrasonic probes for switchgear / transformer tank testing

  • Built-in data storage & PC software for trending and reporting

Technical Specifications

Parameter Specification
Detection Method HF, TEV, Ultrasonic (depending on probe)
Frequency Range High-Frequency Band PD Detection
Display Real-time waveform + PRPD pattern display
Output & Reporting USB / PC Software / On-board recording
Power Rechargeable battery (field portable)
Applications Cables, Switchgear, Transformers, Motors, Generators

Supported Applications

  • MV/HV power cable PD inspection (joints, terminations, splices)

  • Switchgear PD monitoring to detect insulation/cell tracking

  • Transformer insulation evaluation (acoustic PD detection)

  • Motor and generator stator winding PD condition assessment

  • Acceptance testing after installation or repair

  • Routine condition monitoring programs

Standard Accessories

  • Main D22 PD Detector Unit

  • HFCT Sensor

  • Connection Leads

  • PC Software

  • Carry Case

  • Operating Manual

Optional Sensors

  • Acoustic / Ultrasonic Probe

  • TEV Probe

  • Flexible Rogowski HF Cable Sensor

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