METROSIL CURRENT TRANSFORMER PROTECTION UNITS (CTPUs)

Prevents dangerous voltages developing during CT open circuit conditions.

Preventative measures are strongly recommended by IEEE in order to protect CTs against open circuit conditions. This condition can inadvertently occur through routine maintenance of the burden or damage to the cables of the secondary circuit. A Metrosil CTPU provides permanent protection against open circuits without the need for user intervention. It acts as a passive device while the burden is connected across the secondary winding, yet immediately clamps overvoltages during an open circuit condition – protecting the CT’s winding insulation and core characteristics.