TCC and CTI are the two most common acronyms in overcurrent protection coordination. Understanding Time-Current Curves Preventing human injury, limiting…
Tertiary winding in transformers have been widely used in the transmission and distribution of electricity - from power transformers up…
Photo Credit: NOJA Power Reclosers, otherwise known as autoreclosers (derived from "automatic reclosing" capability) or ACRs (Automatic Circuit Reclosers) have…
Impedance-based fault location is widely used throughout the power transmission and distribution industry. In fact, for most numerical relays, one-ended…
In our introductory article on distance relaying, we presented a simple apparent impedance calculation for a phase-to-phase fault on a…
The main objective of any protection system is to interrupt short-circuits as fast as possible. The means to achieve this…
Inverse Definite Minimum Time (IDMT) overcurrent relays operate when current exceeds the pick-up value and with an operating time that…
The selection of the short-circuit rating of power fuses and low voltage circuit breakers are treated differently than medium and…
Understanding overcurrent protection device characteristics is very important in a protection coordination study. To start our discussion on common overcurrent…
Electrical reclosers are widely used in overhead electrical distribution systems to detect and interrupt momentary faults mostly due to vegetation,…