This course provides you with the knowledge and skills necessary to protect the key components of a power system network. These components include transmission lines, transformers, generators, induction motors and busbars. Protection of these elements from faults is critical to ensure the stability of the power system network, enable a stable power supply and prevent damage to the components due to faults in the power system. We study the carrier-aided schemes used in the protection of transmission lines. Then we examine the principles of auto-reclosing and synchronizing schemes used for restoring power connections after clearance of faults. We introduce you to the three types of transmission line protection: including current-based, distance relaying and pilot protection schemes. We demonstrate the wire pilot relaying, phase comparison and carrier blocking schemes. Research the carrier-aided transfer tripping schemes and their underreach and overreach versions. 

Next, you will learn the schemes used to protect transformers from the various types of faults. Three types of faults (incipient, internal and external) affect transformers. We explain these along with the power protection schemes used to safeguard transformers. You will learn how to protect generators, which are the most expensive power plant components. Learn the different types of protection and how they work. Analyze the sources of transients and surges and the various protection schemes used for these faults. We will examine arc interruption theory, Slepian’s Theory, Cassie’s Theory and arc quenching theory. Quenching of an arc in an alternating current (AC) circuit requires a mechanism that converts the conduction path across the contacts of a circuit breaker into a non-conducting path.

Finally, you will study the concept of ‘current chopping’. We outline the different types of circuit breakers and conclude with the types of tests generally performed on relays and the commissioning and maintenance of relays. Protection of critical components of a power system network is crucial. This course will thus benefit professionals in power system networks seeking to refresh or expand their knowledge base as well as anyone considering a career in the field of power systems protection. Start this course today!

Course image credit: AB Electrical & Communications Ltd (https://www.abelectricians.com.au/)