Differential Protection – Fast and Reliable
A few years back, I was seconded to assist in the commissioning of a cooling tower for a 1000 MW coal thermal power plant. The cooling tower was not a …
Calculation of Maximum and Minimum Short-circuit Currents
The calculation of maximum and minimum short-circuit currents as per IEC 60909 is based on the following assumptions. No change in the type of short circuit involved, that is, a …
Importance and Usage of Short-circuit Current Calculations
Why do Electrical Engineers need to do short-circuit or fault calculations? The answers are simple. First, to determine the rating of the electrical equipment to withstand thermal and electromagnetic effects …
Open Circuit Faults
Majority of text books disregard open circuits when presenting unbalance faults in a power system. Almost always, only short-circuit faults are considered. In the following circuit diagrams, it is assumed …
Fault Sequence Network Connections
Calculating three-phase faults is very straight forward. Unbalance faults, however, has a little bit of challenge in it as it requires some imaginations to be understood. To provide better understanding …