Selecting a suitable portable partial discharge tester is crucial for power maintenance teams to improve inspection efficiency and ensure equipment safety. There are various PD testing devices on the market with different functions, performances and applicable scenarios. Many purchasers face confusion in model selection. This complete buying guide summarizes core evaluation indicators to help you select the most cost-effective multifunctional PD tester for on-site substation inspection.
Key factors to evaluate partial discharge tester
Supported PD sensors (TEV/UHF/HFCT/AA/AE)
A high-quality portable PD detector should support multiple mainstream sensor interfaces, including TEV, UHF, HFCT, AA air-coupled ultrasonic and AE contact sensors. Rich sensor compatibility enables one device to adapt to switchgear, GIS, transformer, cable and other equipment testing, avoiding the need to purchase multiple single-function devices and reducing procurement costs.
PRPD & PRPS pattern analysis capability
PRPD (Phase Resolved Partial Discharge) and PRPS pattern analysis are core professional functions of PD testers. These two modes can display the phase distribution, amplitude and repetition rate of discharge signals in real time. Maintenance personnel can accurately judge defect types and fault severity through pattern characteristics, which is an indispensable function for professional PD diagnosis.
AI automatic PD defect identification
Traditional PD testers rely entirely on manual experience to analyze waveforms, which has high technical thresholds and is prone to misjudgment. Advanced portable PD detectors are equipped with AI intelligent diagnosis algorithms, which can automatically identify common defects such as floating discharge, surface discharge and corona discharge, realizing one-click intelligent analysis and greatly reducing the technical requirements for operators.
Non‑intrusive live‑line testing requirement
On-site substation inspection prioritizes live-line non-intrusive testing to avoid power outage losses. The selected PD tester should support non-contact and non-power-off detection, with simple and fast sensor installation, no damage to equipment structure, and no impact on normal power system operation.
Optional functions: IR thermal imaging, SF6 leak detection
Excellent multifunctional PD testers integrate extended practical functions on the basis of basic PD detection. Infrared temperature measurement function can monitor equipment overheating faults, and SF6 leak detection function is suitable for GIS equipment inspection. The integrated design realizes multi-purpose of one machine and improves the comprehensiveness of on-site inspection.
Data storage, report generation & APP synchronization
On-site test data management is an important part of standardized maintenance. Professional PD detectors support massive local data storage, automatic generation of standard test reports, and mobile APP data synchronization functions. It is convenient for personnel to archive test data, track equipment operation status, and form complete maintenance files.
Typical application scenarios for handheld PD detector
Portable handheld PD testers are widely used in substation daily patrol inspection, new equipment commissioning acceptance, regular equipment maintenance, fault troubleshooting and other scenarios. They are suitable for rapid screening and precise diagnosis of partial discharge defects in switchgears, GIS, transformers, high-voltage cables and ring main units, meeting the all-weather and full-scene testing needs of power system predictive maintenance.
MOEORW‑Wi900PD multifunctional partial discharge detector meets above requirements for substation predictive maintenance.
