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TSC (Total Surge Cancellation) is truly remarkable technology since it entirely eliminates damaging surge energy from protected equipment, not merely suppresses the surge to a lower value (WVR US patent 6,728,089, TSC US patent 7,068,487).
Surge frequencies are in the 1,000 Hz region and higher, while the power frequency is only 60 Hz. With this wide frequency difference, it is relatively easy to filter off the undesired surge frequencies and noise. TSC does this by first filtering off the most dangerous surge frequencies, and then canceling the remaining residual surge voltage.
Refer to the simplified schematic below.
A surge enters at point A.
The transformer cancelling winding immediately begins to develop a cancelling voltage due to the surge current flow in the transformer primary winding.
The surge is filtered and delayed by the transformer primary inductance and the capacitor, with only some residual low frequency surge components appearing at point B, but delayed in time due to the filtering action.
The cancelling voltage from the transformer is added to the point B filtered surge.
Adding the cancelling voltage to the delayed residual surge voltage prevents even the residual surge voltage from exceeding the power wave peak voltage, reducing the surge voltage let-through to virtually zero!
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