Online Detection and Location of Low-Level Arcing in Dry-Type Transformers

This article describes the development of a microprocessor-based system, based on four different physical phenomena, for reliable and accurate detection and location of arcing in dry-type transformers. The proposed technique was tested for actual arcing, generated on a 15kVA, 230/115 V Y/?? transformer enclosed in a 30"??30"??21" metallic enclosure. Some results showing the performance of the detection and location system are presented in the article. The technique can be applied to detect arcing in metal-clad low-voltage/medium-voltage switchgear, drives, GIS (gas insulated switchgear), generator bus-ducts, and other metal-clad electrical apparatus against arcing.