To be competitive, some electrical contractors often supply low-voltage (LV) service entrance switchboards and switchgear that meet the minimum safety requirements of the National Electrical Code (NEC ...

A transformer protection relay does not replace upstream devices. It defines responsibility. By clearly assigning fault ...

Ground fault protection is a cornerstone in ensuring the safety and operational reliability of modern power systems. Ground faults, which occur when an unintended electrical path connects a live ...

One of the most important aspects of a safe electrical power system is the proper performance of ground-fault protective equipment. Mandated by the National Electrical Code (NEC), Art. 230.95(C) ...

Littelfuse, Inc. announced its new EL731 AC/DC Sensitive Earth-Leakage Relay, which can detect ground currents, even in resistance-grounded electrical systems,all the way down to 0 Hz. Littelfuse, Inc ...

The objective of protective relays and protective schemes is to protect electrical equipment such as transformers, lines, cables, bus bars, etc. during abnormal system conditions. Hence, protective ...

Differential protection is best understood as a fault control philosophy rather than a component category. The relay itself is secondary to the scheme it enforces. Once a zone is defined, the system ...

Insulation resistance testers, often called megohmmeters, are fundamental tools for preventive maintenance, used to assess ...

AREVA Transmission & Distribution has just launched a cost-efficient and user-friendly family of advanced numerical distance and differential protection relays in its MiCOM range AREVA Transmission & ...