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What is difference between the Peak Current Common Mode and Peak Current Normal Mode specification for a Surge Arrest?
In the context of power supplies, noise is any undesirable voltage impulse which appears at the output. Noise at the output is caused by noise on the three input wires and may appear as either "common-mode" or "normal-mode." Figure 1 illustrates how common-mode and normal-mode noise appear on the power wires.
Common-mode noise is present on both the active and neutral wires and is measured with respect to ground. (The term "common" refers to the fact that identical noise appears on both the active and neutral wires.) Incorrectly, however, common-mode noise is understood to be only on the neutral wire. Common-mode noise can be created by lightning, the switching of circuit breakers or poor grounding.
Noise which can be measured between the active and neutral wire is called normal-mode and is sometimes referred to as differential-mode or transverse-mode noise. Most normal-mode noise is created as a result of large loads switching on or off, particularly big motors and power factor correction capacitors.
Publicado para:APC Peru
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