With today’s technological advancements, electromagnetic interference (EMI) in high voltage (HV) Laboratories is extremely important, especially for sensitive Partial Discharge (PD) measurements. To avoid electromagnetic interference during partial discharge studies, the laboratory must be shielded for accurate measurements and findings. There are number of techniques used for shielding to avoid noise during PD measurements, but all the techniques are very expensive and complex. In order to develop a low-cost, practical solution for denoising sensitive PD measurements, two portable prototype models of shielding enclosures based on the operating principle of Faraday Cages are fabricated and used in this research. A comparative analysis of both portable cages was undertaken and effect of the cage’s material on its denoising performance was observed. Practical experimentation yielded effective average noise reduction up to 0.5 pC for 1 kV by a thin aluminum foil cage, and ways to further improve the denoising capability are also suggested.

An effective and reliable grounding system is a necessary parameter for ensuring the safety of test equipment and personnel working in a high-voltage laboratory. This paper analyzes the performance of the grounding system of a high-voltage laboratory located at USPCAS-E, NUST. By using grounding system analysis techniques based on the IEEE standard 80-2013, and programs based on soil-layer models, the grounding system of this high-voltage laboratory is analyzed and solutions to the issues encountered are recommended.