Metering
Understanding the ratios of magnetic HV instrument current transformers
The primary winding is a part of the network, carrying the actual load current. The transformer’s secondary circuits usually consist of several units, each of them having its own magnetic… Read more
May 22, 2015 | By Edvard Csanyi
Electric Motor
5 most common motor load types
Certain load types are characteristic in the industrial world. Knowing the load profile (speed range, torque and power) is essential when selecting a suitable motor and frequency converter for the… Read more
May 20, 2015 | By Edvard Csanyi
Energy and Power
Important Guidelines To Startup and Shutdown a Large Generator
The purpose of this guidelines is to ensure the continuing operational integrity of generators. Operating conditions (startup and shutdown) that have forced units off-line or have damaged or shortened the… Read more
May 18, 2015 | By Edvard Csanyi
Electric Motor
The basics of built-in motor protection for engineers beginners
In order to avoid unexpected breakdowns, costly repairs and subsequent losses due to motor downtime, it is important that the motor is fitted with some sort of protective device. This… Read more
May 15, 2015 | By Edvard Csanyi
Electric Motor
Motor connection for clockwise and counterclockwise direction of rotation
Star-delta (in North America the designation “wye-delta” is commonly used instead) starting is the simplest method for reducing the starting current of a motor. The technique can be used with… Read more
May 13, 2015 | By Edvard Csanyi
Industrial Automation
Field data interface devices as eyes and ears of a SCADA system
Field data interface devices form the “eyes and ears” of a SCADA system. Devices such as reservoir level meters, water flow meters, valve position transmitters, temperature transmitters, power consumption meters,… Read more
May 11, 2015 | By Edvard Csanyi
Energy and Power
3 Overcurrent Protective Device Ratings You MUST Properly Select
In order for an overcurrent protective device to operate properly, the overcurrent protective device ratings must be properly selected. These ratings include: Voltage rating Ampere rating and Interrupting rating – Minimum… Read more
May 08, 2015 | By Edvard Csanyi
Energy and Power
7 factors to consider when choosing single versus parallel generators
Paralleling is the synchronous operation of two or more generator sets connected together on a common bus in order to provide power to common loads as shown in Figure 1. In… Read more
May 06, 2015 | By Edvard Csanyi
Maintenance
Maintenance and testing of overcurrent protective devices
When designing electrical distribution systems, required maintenance and testing of the overcurrent protective devices is a very important consideration. The electrical system reliability, component and circuit protection, and overall safety… Read more
May 04, 2015 | By Edvard Csanyi
Energy and Power
Calculating the short circuit heating of busbars
Like all electrical circuits, busbars need to be protected against the effects of short-circuit currents. The open construction of busbars increases the risk of faults, e.g. by the ingress of… Read more
May 01, 2015 | By Edvard Csanyi
Electrical Lectures
Cable sizing of sub-main electrical circuits (working examples)
A sub-main electrical circuit can be defined as a circuit connected directly from the main LV switchboard to a sub-main distribution panel or a rising main for final connection of the minor… Read more
Apr 29, 2015 | By Edvard Csanyi
Energy and Power
5 Types of equipment which generates the most harmonics
Harmonic load currents are generated by all non-linear loads. This includes: Switched mode power supplies (SMPS) Electronic fluorescent lighting ballasts Variable speed drives (VSDs) Uninterruptible power supplies (UPS) Magnetic-cored devices… Read more
Apr 27, 2015 | By Edvard Csanyi
Maintenance
What to do if transformer has an excessive moisture content
The term “moisture” in the transformer industry is commonly used to indicate water which is absorbed in the paper or dissolved in the oil. Occasionally, the terms “water” or “water… Read more
Apr 24, 2015 | By Edvard Csanyi
Testing and Commissioning
What to check when commissioning variable speed drives
The main purpose of commissioning VSDs is to ensure that: The AC converter and motor have been correctly installed and meet the wiring and safety standards such as IEC 60364… Read more
Apr 22, 2015 | By Edvard Csanyi
Energy and Power
4 power transformer protection devices explained in details
The power transformer protection is realized with two different kinds of devices, namely the devices that are measuring the electrical quantities affecting the transformer through instrument transformers and the devices… Read more
Apr 20, 2015 | By Edvard Csanyi
