In our previous article on transformer vector groups, we mentioned the importance of the delta connections to determine whether the…
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…