Courses
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Introduction to Protective Device Coordination Analysis
Course number
EE-03-909
PDH credits
3
Introduction to Protective Device Coordination Analysis Author: Velimir Lackovic The objective of a protection scheme in a power system is to minimize hazards to personnel and equipment while allowing the least disruption of power service. Coordination studies are required to select or verify the clearing characteristics of devices such as fuses, circuit breakers, and relays…
Introduction to Motor Starting Analysis
Course number
EE-04-908
PDH credits
4
Introduction to Motor Starting Analysis Author: Velimir Lackovic The starting current of most AC motors is several times normal full load current. Both synchronous and induction motors can draw five to ten times full load current when starting them across the line. Motor-starting torque varies directly as the square of the applied voltage. If the…
Harmonic Analysis Basics
Course number
EE-05-907
PDH credits
5
Harmonic Analysis Basics Author: Velimir Lackovic A harmonic-producing load can affect other loads if significant voltage distortion is caused. The voltage distortion caused by the harmonic-producing load is a function of both the system impedance and the amount of harmonic current injected. If the system impedance is low, the voltage distortion is usually negligible in…
Grounding System Theory and Practice
Course number
EE-03-906
PDH credits
3
Grounding System Theory and Practice Author: Velimir Lackovic The flow of current from an underground-fault condition will result in voltage gradients within and around the substation, not only between structures and nearby earth, but also along the ground surface. In a properly designed system, this gradient should not exceed the limits that can be tolerated…
Gas Insulated Substation Definitions And Basics
Course number
EE-04-904
PDH credits
4
Gas Insulated Substation Definitions And Basics Author: Velimir Lackovic Determining whether to use AIS or GIS technology requires assessing many elements and soliciting input data from many sections within an investor’s organization. Some elements, such as aesthetics, may significantly affect a user’s selection. It is also critical to note that the optimal substation arrangement may…
Distance Protection of Electrical Power Systems
Course number
EE-03-903
PDH credits
3
Distance Protection of Electrical Power Systems Author: Velimir Lackovic Distance protection, is a non-unit protection arrangement providing significant financial and technical benefits. Unlike phase and neutral overcurrent protection arrangements, the key benefit of distance protection is that its short circuit current coverage of the protected element is almost autonomous of source impedance changes. Since the…
Power System Transient Stability Study Fundamentals
Course number
EE-03-902
PDH credits
3
Power System Transient Stability Study Fundamentals Author: Velimir Lackovic The ability of a power system, containing two or more synchronous machines, to continue to operate after a change occurs on the system is a measure of its stability. The stability problem takes two forms: steady-state and transient. Steady-state stability may be defined as the ability…
Power System Short Circuit Current Studies
Course number
EE-05-901
PDH credits
5
Power System Short Circuit Current Studies Author: Velimir Lackovic Short-circuit studies are done to determine the magnitude of the prospective currents flowing throughout the power system at various time intervals after a fault occurs. The magnitude of the currents flowing through the power system after a fault varies with time until they reach a steady-state…