How does a Buchholz relay work? Buchholz relay belongs to ‘standard’ protection elements of liquid-immersed power transformers including special designs such as converter duty transformers. The simple gas-actuated relay is so popular and reliable that even after development of sophisticated Read more
Abbreviations and Definitions This post summarizes and explains some of the most commonly used abbreviations and definitons from the field of variable frequency drives (VFD), drive systems and associated areas, such as power electronics, harmonics and power quality, monitoring, testing… Read more
Power cable basics In this short series we talk about power cables. Naturally, we focus on cables in VFD applications, particularly on cables between inverter and motor. Before diving into specific topics related to VFD operation let’s spend some time Read more
Confused about motor nameplate voltage? Have you ever observed the difference between power system voltage and motor nameplate voltage in North American region? One can get easily confused seeing that the nameplate voltage of the machine does not fit the Read more
Heavy duty trucks go electric thanks to Volvo Trucks Exciting news from Gothenburg, Sweden Volvo Trucks is paving the way for e-mobility of heavy duty trucks. As per company’s committment, the pre-sale of Volvo FMX Electric and FH Electric started Read more
Transformer bio-based insulating liquids Environmental considerations play increasingly important role for electric equipment. In electric drive systems they may affect the selection of the circuit breaker (in case it is gas insulated) or the selection of transformer type. In this Read more
Which one is your VFD hero? VFDs, together with their rotating partners (motors) perform lot of work behind the scene. As we already know, there are multiple VFD topologies available on the market. While they all fulfill the basic purpose, Read more
Comparison of arc resistant design solutions In our previous posts regarding arc proof design [1, 2] we have discussed the danger and possible fatal impact of arc flash. We have listed the guiding standards and presented the most common solutions Read more
VFD purchase specification If you follow our blog regularly then you are aware of the few posts published by us that deal with VFD specifications [1, 2]. The last post on this topic [2] also triggered some discussion (which is Read more
Arc resistant design solutions In our introduction last time we have explained the danger of an electric arc flash for the personnel and the equipment. The arc reaches extremely high temperatures and releases pressure and sound waves into the surrouding. Read more