Description
The OCP-35 design provides protection from the dangerously high voltages (≥100V) that can be generated by open circuit current transformer secondaries. If secondary voltage rises above approximately 35Vpk the OCP-35 quickly clamps it to a non-destructive level of less than 1.5V.

Clamping continues until the next zero crossing at which time it resets or clamps again if high voltage is still present. Both positive and negative half-cycles of a sinewave are clamped. In normal operation the OCP-35 creates negligible leakage current and does not introduce phase or ratio errors.

OCP-35

Typical Current Transformer