The PSStech Open Phase Protection (OPP) system* is installed in 23 nuclear power plants, protecting 39 units. The PSStech OPP system is the leader in the industry in open phase protection.

PSStech OPP systems are protecting transformers in nearly 40% of operating nuclear power plants across the United States. Each site represented has multiple systems. There are more than 100 PSStech systems installed to date.

Why Choose the PSStech System?

PSStech Open Phase Protection System

The PSStech implementation of open phase detection allows for a fail-safe and redundant detection design. This design includes neutral overcurrent protection, continuous monitoring of all major system components, and only requires monitoring of a change in signal level. This results in drastically reducing the engineering manhours needed.

The system combines active and passive protection, and is the preferred method over passive only protection. Due to the simple, minimally intrusive installation, this design requires minimal outage time and maintenance.

The OPP system incorporates a simple operator interface developed from field-proven technology. This system is the only field-proven system without blind spots for any type of open phase condition, with or without a ground fault of any impedance.


PSStech, LLC — 101 Skyline Drive, Warrior, Alabama 35180, USA

Phone: +1.205.631.3357

Email: info@psstech.com