Energy and Power
What’s That Hissing, Cracking, Buzzing Noise?
Corona can be visible in the form of light, typically a purple glow, as corona generally consists of micro arcs. Darkening the environment can help to visualize the corona. We once attached a camera (set to a long exposure time)… Read more
Oct 30, 2013 | By Edvard Csanyi
Medium Voltage
Field Inspection and Testing of Medium-Voltage Motor Control Centres (MCCs)
Check MCC equipment for: alignment, levelness, and tightness of all bolting. Check all equipment for: removal of blocking, supports, temporary ties, and temporary wire jumpers. Check that all protective barriers are properly installed. Check door alignment of individual starter units… Read more
Oct 28, 2013 | By Edvard Csanyi
Energy and Power
What’s important for water power designer to make the right choice of a turbine
The water power designer has to make a choice on the type of turbine that can be adopted for a particular project. After the range of head to be handled by a turbine has been evaluated by stream flow analysis… Read more
Oct 25, 2013 | By Edvard Csanyi
Testing and Commissioning
Eight important checks to do before powering up the dry-type transformer
The transformer should be powered up only after checking the following items: name plate ratings, parallel operation, connections: cables, busbars, tap change connections, grounding connection, thermal protective device, impurities removal and insulation resistance test. Make sure the name plate ratings… Read more
Oct 23, 2013 | By Edvard Csanyi
Power Substation
Dry-Type Transformer Installation and Ventilation Requirements
Dry-type transformers should be installed over foundations that are properly leveled and capable to withstand their weight. When a transformer is fitted with wheels, make sure the equipment will be equally supported on its base points in order to assure… Read more
Oct 21, 2013 | By Edvard Csanyi
Energy and Power
Natural Ventilation Of Power Substation
The operation of a system of natural ventilation is as a result of a decrease in air density as its temperature is raised due to the heat gain from various sources. This decrease in air density causes a pressure differential… Read more
Oct 18, 2013 | By Edvard Csanyi
Energy and Power
General Arrangement of Hydropower Powerhouse
In general, a powerhouse in hydropower plant may be divided into three areas: The main powerhouse structure, housing the generating units and having either separate or combined generator and turbine room, Erection bay, and Service areas. The generator room is… Read more
Oct 16, 2013 | By Edvard Csanyi
Energy and Power
An Overview Of Grounding System (Grounded)
Continued from technical article: An Overview Of Grounding System (Ungrounded) Solidly grounded system Resistance grounded system Reason for resistance grounding System earthing at EHV level Let us assume that R phase (Phase-3 in figure-3) is shorted to ground than: If… Read more
Oct 14, 2013 | By Asif Eqbal
Energy and Power
An Overview Of Grounding System (Ungrounded)
Ungrounded system Derivation of current expression in ungrounded system Advantages & disadvantages of ungrounded system Concept of effective and non-effective grounding Coefficient of earthing and earth fault factor Before 1950 power system were often without neutral grounding. Such system had… Read more
Oct 11, 2013 | By Asif Eqbal
Energy and Power
4 General Safety Practices To Remember ALWAYS!
In addition to the safety precautions (access to HV enclosures and work on HV electrical equipment) the following general safety practices should be ALWAYS observed for work on electrical equipment. The scope of work and relevant circuit should be checked… Read more
Oct 09, 2013 | By Edvard Csanyi
Energy and Power
What’s Really Important When You’re Designing The Low Voltage Switchgear?
Here what’s important when you’re designing the low voltage switchgear: Device Application in the Supply Circuit Short-circuit strength Release (Trip Unit) Device Application in Supply Circuits (Coupling) Device Application in the Distribution Circuit Device Application in the Final Circuit The… Read more
Oct 07, 2013 | By Edvard Csanyi
Electrical Lectures
Heat vs. Current in a Resistor
It is converted from one form to another. One of the most familiar forms of energy is heat. When a current (I) is forced through a resistor (R) by applying a potential (V), the electrical energy is converted to heat… Read more
Oct 04, 2013 | By Edvard Csanyi
Electrical Lectures
What Is a Good Ground Resistance Value?
The goal in ground resistance (or earth resistance) is to achieve the lowest ground resistance value possible, that makes sense economically and physically, when contacting the earth, also known as the soil/ground rod interface. Ideally, a ground should be zero… Read more
Oct 02, 2013 | By Edvard Csanyi
