Press Release November, 2021

Techniques for Detecting Earth or Ground Faults on Delta Networks

NOJA Power OSM Recloser

Among the four main Medium Voltage distribution network earthing techniques, (Solidly/Effectively Earthed, Resistance Earthed, Unearthed and Compensated Neutral), delta networks offer significant challenges for detecting single line to ground faults.

Press Release March 2021

Protection Feature Application Summary

NOJA Power OSM Recloser

Digital protection relays offer extensive functionality, and NOJA Power’s RC series controllers are no exception. While the vast majority of users will only apply Overcurrent, Earth Fault and Sensitive Earth Fault (Ground fault to our US users) features to protect their distribution networks, we often receive questions regarding the applications for the many other features on offer.

Press Release March 2021

Detecting Earth Faults on Isolated and Resonant Earthed Networks

NOJA Power OSM Recloser

Isolated and resonant earthed electricity distribution networks present a challenge for detecting single line to ground faults. Despite this fault classification being the most common on overhead networks, it is also the most difficult to detect in these network topologies.

However, this is a solved problem.