Energy and Power
It’s About Time. Engineers, Happy New Year!
Well, it’s about time. With 2018 just around the corner, it’s time to stop and look back at yet another good year at EEP. Beside publishing about 300+ technical articles and electrical guides and really amazing engagement, we are especially… Read more
Dec 30, 2017 | By Edvard Csanyi
Power Substation
3 Bad Conditions That Cause False Differential Current In Power Transformer
When applying differential protection of power transformer, three bad conditions must be considered which can lead to unbalance to the currents applied to the relay (compared with the expected currents when power flow into the transformer is equal to the… Read more
Dec 27, 2017 | By Edvard Csanyi
Electric Motor
10 Common Questions You Can Expect In Electrical Engineering Examination Test
This examination will focus on testing the fundamentals of electrical engineering from low voltage to high voltage. Of course, you can use huge EEP’s resources for help in calculations and finding right answers. Ok, let’s start with questions. You can… Read more
Dec 26, 2017 | By Edvard Csanyi
High Voltage
This Is Why HVDC Transmission System Beats HVAC In These Essential Applications
For the most part, electric power is transmitted worldwide by means of ac. However, there are certain applications where dc transmission offers distinct economic and/or performance advantages. These applications include long-distance overhead transmission, underwater or underground transmission, and asynchronous ties… Read more
Dec 21, 2017 | By Edvard Csanyi
Power Substation
Important Factors In Design Of Distribution Substations
Distribution substation design must be a combination of reliability and quality of the power supply, safety, economics, maintainability, simplicity of operation, and functionality. Safety of life and preservation of property are the two most important factors in the design of… Read more
Dec 20, 2017 | By Edvard Csanyi
Power Substation
What does a good grounding of the power substation and switching station really mean?
Provision of adequate grounding in a substation and switching stations are very important for the safety of operating personnel as well a electrical devices do not rise above tolerable thresholds and that the earth connection is rugged to dissipate the… Read more
Dec 18, 2017 | By Edvard Csanyi
Premium Content
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Analyzing Power System And Equipment Performance Through Oscillographic Records
Most technically oriented people recognize the familiar 60Hz voltage and current traces that constitute the parameters of an operating power system. There are, however, transient components superimposed on the 60Hz waveform in the form of spikes and higher and lower…...
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Dec 15, 2017 | By Edvard Csanyi
Electric Motor
Contactor As An Important Part Of The Motor Control Gear
Motor control gear and associated circuitry are fundamental parts of electrical distribution and utilisation systems. Motor control gear in its simplest form may be a direct on-line starter consisting of a switching device (contactor) and tripping device (overload relay) mounted… Read more
Dec 15, 2017 | By Edvard Csanyi
Protection
Primary injection testing of protection system for wiring errors between VTs / CTs and relays
This type of test involves the entire circuit – current transformer primary and secondary windings, relay coils, trip and alarm circuits, and all intervening wiring are checked. There is no need to disturb wiring, which obviates the hazard of open-circuiting… Read more
Dec 13, 2017 | By Edvard Csanyi
Electric Motor
Ten different duty types (load cycle) of a three-phase asynchronous motor
The term duty defines the load cycle to which the machine is subjected, including, if applicable, starting, electric braking, no-load, and rest de-energized periods, and including their durations and sequence in time. Duty considered as a generic term, for example,… Read more
Dec 11, 2017 | By Edvard Csanyi
Energy and Power
Seven Bad Effects Of Corona On Transmission Lines
All the diverse ionization processes involved in producing corona discharges in the highly stressed regions near the conductors of transmission lines, as well as the creation and movement of charged particles in the electric field, require an expenditure of energy…. Read more
Dec 08, 2017 | By Edvard Csanyi
Transformers
Voltage Regulation By Transformer Off-Load Tap Changer, On-Load Tap Changer and AVR
Almost all transformers incorporate some means of adjusting their voltage ratio, by adding or removing tapping turns. This adjustment may be made by an on-load tap-changer, or by means of an off-circuit tap-changer, or by the selection of bolted link… Read more
Dec 06, 2017 | By Edvard Csanyi
Energy and Power
Protections For Medium Voltage Synchronous Machines (Generators) – IEEE C37-2 Codes
The protection system for MV generators (synchronous machines) must be carefully selected and studied for the application it is destined for and it is not normally possible to define a single solution. Only medium voltage generators are analysed and large… Read more
Dec 04, 2017 | By Edvard Csanyi
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How Bad Harmonics Influence The Work Of Rotating Machines (Induction Motors)
The presence of harmonics in the work of induction motors can be pretty bad. Why? They produce elastic deformation, that is, shaft deflection, parasitic torques, vibration noise, additional heating, and lower the efficiency of rotating machines. The movement of the…...
Membership Upgrade Required
This content is not available in your premium membership plan. Please upgrade your plan in order to access this content. You can choose an annually based Basic, Pro, or Enterprise membership plan. Subscribe and enjoy studying specialized technical articles, online video courses, electrical engineering guides, and papers.With EEP's premium membership, you get additional essence that enhances your knowledge and experience in low- medium- and high-voltage engineering fields.
Limited time offer! - Save 15% on PRO Plan with coupon RLC15
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Dec 01, 2017 | By Edvard Csanyi
Transformers
Voltage Regulators Used To Control The Voltage At The End Of a Distribution Feeder
There are three main methods used to control the voltage at the end of a distribution feeder – By using control equipment to vary the voltage at the supply end of the feeder or at the load end and by… Read more
Dec 01, 2017 | By Edvard Csanyi
