Posts tagged as Current

Understanding the basics of power measurement theory

Electrical power applications are changing rapidly which means the load on the electric network is changing: more harmonics and more risk of unbalance. This so-called “bad” power costs money and wastes energy. This article provides some basic theory to understand what is happening with today’s electrical applications. Apparent power To understand the relation between active […]

Measuring high currents with small current sensors

Modern current measurement trends in uninterruptible power supplies (UPS) and renewable energy systems is towards smaller physical size, higher current ranges, faster response times and lower cost. The simplicity of open-loop sensors makes them an attractive solution for attaining these objectives. This article discusses three new families of sensors which allow the nominal current to […]

Dealing with inrush currents in distribution transformers

Among the subtleties associated with distribution switchgear configuration, inrush current is a necessary evil which must be taken into consideration. It is the source of much frustration for field operators and SCADA control teams; when issuing a close command on an open breaker results in an immediate trip. Was it genuine fault? Is it risky […]