Purpose of electrostatic shield What is the electrostatic shield and why is it actually used? This article briefly explains the purpose of electrostatic shield in VFD input transformers [1]. First note that there are several terms being used for what we called “electrostatic shield” in the title of this article: Read more…
Overvoltage protection of transformers This is the continuation of [1] that made an introduction into protection of VFD transformers. The focus of this article is on overvoltage protection. Particular attention is paid to very fast transient overvoltages caused by switching of vacuum circuit breakers. Keep reading to learn about the Read more…
Protection of VFD transformers In the introduction to this series we have explained the differences between a distribution/power transformer and a VFD transformer [1]. Due to different design, construction and operation of VFD transformers the protection requirements shall be adapted as well. While many end users, system integrators, EPCs and Read more…