Harmonic calculation versus network harmonic study As our regular reader you already have a solid knowledge about network harmonics caused by non-linear power electronic systems. It does not surprise you that network might have resonance(s) – a topic that needs Read more
Active harmonic mitigation with AFE drives In this article we will once again touch the topic of grid side harmonics, particularly focusing on active harmonic mitigation with AFE drives. Abbreviations used: AFE = Active Front End APF = Active Power Read more
Energy saving study: Special promotion (limited) Take an advantage of our limited offer and get a free-of-charge support for an energy saving study. Together we will assess the energy and cost saving potential resulting from the use of a variable Read more
Tap changer: Yes or No? Shall a VFD transformer be equipped with a tap changer? What are the pros and cons of a tap changer on converter duty transformer? What kind of tap changer shall be used? How many taps Read more
Prague metro EN: Prague metro / CZ: Pražské metro We invite you on a short excursion of Prague metro – discover with us the backbone of the transportation system of the city of Prague. Efficient public transportation system is a Read more
Inverter current higher than input current (New Year’s Eve issue) Can inverter current to the motor be higher than the rectifier input current?That is a question that puzzles some people. Let’s have a closer look in our year-end post inverter Read more
Locomotive SKODA ES 499.0 (350 series) This article presents locomotive SKODA ES 499.0 (nowadays 350 series). It was a crown jewel of back then Czechoslovak Railways and despite its age of over 40 years remains operational until today as four-axle Read more
AC versus DC drive For decades DC drive was a preferred choice for variable speed motors due to its easy and accurate way of speed or torque control. However, the development of AC drives changed the competitive landscape and paved Read more
Merry Christmas We would like to wish all our customers, partners, supporters and friends a Merry Christmas. Thank you for joining us on our journey through 2020. As the world is getting faster and faster, we hope that you can Read more
VFD safety functions In this article you will read about VFD safety functions, their importance and principles. Safety is on top of the agenda for most companies, at least in all developed countries. One top manager calls safety one of Read more