Energy and Power
Three proven ways to reduce electrical energy losses in buildings
As savings in terms of costs are the main concern for the operators, the first approach is to try to reduce electrical energy losses in buildings. Also, the electricity supply network itself consumes energy. Moreover, if it is not suitably… Read more
Jul 24, 2017 | By Edvard Csanyi
Electrical Lectures
How to calculate number of steps & reactive power of the capacitor banks
Depending on the size of a compensation unit, it is assembled with capacitors of equal size (in bigger units) or of different size. A unit with a total reactive power of, for example, 300 kvar consists of six power capacitors,… Read more
May 17, 2017 | By Edvard Csanyi
Energy and Power
Wiring of power factor relay on LV and MV side (circuit diagrams)
In order to measure electrical power the relay needs to receive the line voltage and current from a current transformer (CT) installed close to the metering point, if possible. To measure reactive power at the power factor relay especially, it… Read more
Mar 31, 2017 | By Edvard Csanyi
Energy and Power
Top six solutions to achieve a high level of energy efficiency in buildings
Energy efficiency in commercial buildings involves providing a given level of performance, cost, quality, availability, and comfort at a minimal level of energy usage throughout the lifecycle of a given asset or process. Generally speaking, energy efficiency involves reducing energy… Read more
Mar 27, 2017 | By Edvard Csanyi
Electric Motor
Why overmotoring an application is not such a good idea
In many instances, the practice has been to overmotor an application, i.e., to select a higher-horsepower motor than necessary. The disadvantages of this practice are: Lower efficiency Lower power factor Higher motor cost Higher controller cost Higher installation costs Let’s… Read more
Mar 13, 2017 | By Edvard Csanyi
Electric Motor
Voltage drop calculation methods with examples explained in details
What we call “voltage drop” is really just the differential in voltage between where the installation started and where the receptor was connected. The primary concern with voltage drop is that, under steady-state conditions of typical load, the voltage at the… Read more
Mar 03, 2017 | By Edvard Csanyi
Maintenance
Performing power factor test on dry-type transformer during commissioning
The power factor test is a maintenance test used to determine the insulation system dielectric power loss by measuring the power angle between an applied AC voltage and the resultant current. Power factor is defined as the ratio of the… Read more
Mar 01, 2017 | By Edvard Csanyi
Energy and Power
4 example calculations of compensation for reactive power
First, let’s say some words about basics of the reactive power in system. Reactive current arises in every electrical system. Not only large loads, but smaller loads as well require reactive power. Generators and motors produce reactive power, which causes unnecessary… Read more
Jan 20, 2017 | By Edvard Csanyi
Energy and Power
How capacitors improve the power factor and how to calculate them?
It’s quite simple. By installing capacitors or capacitor banks. Improving the power factor of an electrical installation consists of giving it the means to “produce” a certain proportion of the reactive energy it consumes itself. The capacitor is most frequently… Read more
Nov 16, 2016 | By Edvard Csanyi
Energy and Power
Tips for power factor correction and good protection of capacitors
Loads such as induction motors draw significant reactive power from the supply system, and a poor overall power factor may result. The flow of reactive power increases the voltage-drops through series reactances such as transformers and reactors, it uses up… Read more
Oct 26, 2016 | By Edvard Csanyi
Energy and Power
4 steps to diagnose a potential harmonics related problem
If a plant engineer suspects that he might have a harmonics related problem, the following steps can easily be performed as an initial investigation into potential problems: Look for symptoms of harmonics as listed in Table 1 below. If one… Read more
Oct 05, 2016 | By Edvard Csanyi
Power Quality
How to locate harmonic currents and where to control them?
On radial utility distribution feeders and industrial plant power systems, the main tendency is for the harmonic currents to flow from the harmonic-producing load to the power system source. This is illustrated in Figure 1. The impedance of the power… Read more
Sep 16, 2016 | By Edvard Csanyi
Energy and Power
Calculate reactive power of the capacitor bank and improve power factor
For the dimensioning of the capacitor bank to be installed in order to improve the power factor of a plant, it is necessary to calculate correctly the power factor according to the consumption or to the load cycle of the… Read more
Aug 24, 2016 | By Edvard Csanyi
Electrical Lectures
Why do we care so much about power factor correction?
Power factor, as every electrical engineer should know, is defined as the ratio of real power to volt-amperes and is the cosine of the phase angle between the voltage and current in an AC circuit. These are neatly defined quantities with sinusoidal… Read more
Apr 15, 2016 | By Edvard Csanyi
Power Substation
Defining size and location of capacitor in electrical system (1)
Type of Capacitor Bank as per Its Application: Fixed type capacitor banks Automatic type capacitor banks Types of APFC – Automatic Power Factor Correction Type of Capacitor as per Construction Selecting Size of Capacitor Bank Selection of Capacitor as per… Read more
Mar 04, 2016 | By Jignesh Parmar
