Partial Discharge (PD) testing is an essential method for evaluating and monitoring the insulation condition of GIS high-voltage switchgear and transformers. The main reasons and significance of PD testing include the following:
1.Early Defect Detection and Warning
Partial discharge is a localized weak discharge phenomenon within the insulation system, often caused by the presence of micro-bubbles, cracks, impurities, aging, or manufacturing defects. PD testing can detect these hidden issues at an early stage, preventing the long-term degradation of the insulation system and stopping minor defects from evolving into major failures.
2.Ensuring Insulation Performance
GIS high-voltage switchgear and transformers operate under high voltage, complex environments, and gas insulation conditions. If partial discharge is not controlled, it can lead to localized deterioration of insulation materials, accelerating insulation aging and even causing insulation breakdown. Regular PD testing helps assess the health of insulation materials, ensuring stable insulation performance and operational safety.
3.Preventive Maintenance and Lifespan Management
By monitoring partial discharge signals, operators can evaluate the condition of the equipment and schedule timely maintenance or replacement, achieving preventive maintenance. This not only prevents unexpected failures but also extends the service life of the equipment, ensuring the long-term stable operation of the power system.
4.Quality Control and Process Optimization
Conducting PD testing during the manufacturing and installation stages helps identify defects in design, production, or installation processes. Timely feedback and corrections improve product quality and overall process standards, reducing operational risks in the later stages.

GTPD-2C Digital partial discharge tester is the digital partial discharge measuring and analyzer adopting the complete new generation technology. It is suitable for partial discharge detection in manufacturing factory and field handover test of transformers, generators, CT/PT, bushings, GIS, capacitors, power cables, switches and other high-voltage electrical equipment with various voltage levels and capacities.

Functions and Features

1. Portable anti-seismic, compact structure, simple operation, suitable for on- site partial discharge detection and location analysis.

2. The test file management function, it realizes data recording, viewing and analysis.

3. It can be used together with a variety of sensors to realize the various kinds of detecting.

4. The testing data can be automatically saved or by manual, and be browsed and played back to analysis automatically.

5. The powerful anti-interference function enables it to be used in complex field.

6. Pulse analysis, spectrum analysis and other spectrum analysis functions.

7. The statistical analysis of selected channels including Q-ɸ, N-ɸ, PRPD, and PRPS can provide users with the characteristic Atlas of current discharge, so that users can accumulate the characteristic Atlas of different discharge types.

8.Partial discharge detection data can be sent to the computer through SD card to complete the creation of user reports.

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