Transfer Impedance

An important aspect of power conditioners is their transfer impedance. This is the resistance that the transformer offers to current passing through it. The lower the impedance, the better the transformer is at allowing current to pass through. Most isolation transformers have impedance ranging from 3 to 6 percent. This means that for short periods of time, if necessary, these transformers can pass current as high as 500 to 1000 percent of their rated loads. On the other hand, there are devices available with impedance of 15 percent or more. These transformers cannot pass such current, and may in fact damage themselves in the attempt. So, take care when choosing a conditioner to select one with as little impedance as possible.