Maintenance
How to better understand transformer failures and maintenance necessity
Generally speaking, the transformer requires less care compared to other electrical equipment. But, as I already stated in some of the earlier technical articles, transformer failures can cause a huge… Read more
Mar 30, 2016 | By Edvard
Energy and Power
10 Factors To Consider When Specifying Transformers
There are many factors that influence final specification of a transformer. However, the following ten factors MUST be considered when specifying transformers. Let’s name these ten factors: Kilovoltampere (kVA) Rating Voltage… Read more
Mar 28, 2016 | By Edvard
Energy Efficiency
Here is why you MUST use variable speed drives in pumping applications
Pumping applications represent a significant opportunity for applying variable speed drives (VSDs) in new, as well as retrofit installations. The majority of pumping applications need to be controlled. It is… Read more
Mar 26, 2016 | By Edvard
Energy and Power
How to manage harmonic currents affecting the neutral
A number of measures can be taken to eliminate or reduce the effects of harmonic currents in the neutral conductor, in particular third harmonic currents. Let’s talk about the following… Read more
Mar 25, 2016 | By Edvard
Electrical Lectures
How rotating magnetic field works in AC machines
The fundamental principle of operation of AC machines is the generation of a rotating magnetic field, which causes the rotor to turn at a speed that depends on the speed… Read more
Mar 23, 2016 | By Edvard
Protection
3 Main causes of false differential current in transformer
Certain phenomena can cause a substantial differential current to flow, when there is no fault, and these differential currents are generally sufficient to cause a percentage differential relay to trip. However, in… Read more
Mar 21, 2016 | By Edvard
Energy and Power
Guidelines To Metering Challenges and How To Overcome Them
In the course of any metering exercise, there will be challenges that arise – these may occur in planning, specifying, purchasing, installing, or in the maintaining of the metering system. This… Read more
Mar 19, 2016 | By Edvard
Energy and Power
Main substations installed on public MV network, their functions and layout
This technical article is a reminder of the main substations installed on MV networks. It is concluded by two layouts showing their applications in real terms. A substation or installation… Read more
Mar 18, 2016 | By Edvard
Power Substation
Matching transformers for parallel operation
The following rules must be obeyed in order to successfully connect two or more transformers in parallel with each other: The turns ratios of all of the transformers must be… Read more
Mar 16, 2016 | By Edvard
Cables
Recommended Practice For Cableways Selection and Installation
The term cableways refers to conductors and/or cables together with the means of support and protection, etc. for example cable trays, ladders, ducts, trenches, and so on… are all cableways…. Read more
Mar 14, 2016 | By Edvard
Energy and Power
Do dry type transformers cost less than oil-filled?
To many industrial and commercial organisations dry type transformers are seen to be advantageous compared with oil filled units. They avoid the perceived fire risk of oil filled transformers and… Read more
Mar 12, 2016 | By Edvard
Cables
Underground residential distribution – More hidden and more reliable
A classic underground residential distribution circuit is an underground circuit in a loop arrangement fed at each end from an overhead circuit (see Figure 1). The loop arrangement allows utilities… Read more
Mar 11, 2016 | By Edvard
Energy and Power
What makes a good grounding system?
The performance of the grounding system is determined by the quality of the following five components all of which are of equal importance. The grounding electrode conductor The grounding connections… Read more
Mar 09, 2016 | By Edvard
Electric Motor
3 reasons for increased efficiency loss in rewound motors
Approximately 300,000 motors are rewound in the UK every year, with an average rating of about 12 kW, so the efficiency of rewound motors is extremely important. The loss in… Read more
Mar 07, 2016 | By Edvard
Low Voltage
18 initial checks of electrical installations that every electrician MUST perform
Before any testing of low voltage electrical installations (and equipment) is carried out, a detailed physical inspection must be made to ensure that everything is to a relevant National standard,… Read more
Mar 05, 2016 | By Edvard
