SE-330-20-11

Protection Relays and Systems are vital pieces of equipment used for safety and fault prevention in the electrical power industry. SE-330-20-11 is a current differential protection unit developed to provide a comprehensive solution for motor protection. By monitoring the current flow, the relay detects abnormal imbalances in the current and causes the power supply to trip, protecting the system from damage.

The SE-330-20-11 is designed to protect three-phase motors in industrial applications, either as a standalone unit or as part of a multi-relay protection system. It is capable of detecting single- or three-phase faults and operates at selectable current levels. The unit features a selectable time delay which allows it to avoid spurious tripping.

The SE-330-20-11 comes with a variety of protection features which offer extensive fault detection and mitigation capabilities. The relay is capable of detecting a short-circuit fault, an earth fault, phase-to-phase faults, an overload, a reverse-phase sequence or ground fault, and an inrush current. It can detect all these faults even if the load current has decreased, and it also has adjustable time-delay settings so that it can quickly and accurately detect and respond to the fault conditions.

The SE-330-20-11’s working principle is based on differential current protection. This means that the current is monitored for imbalances between two phases, or between the phase and ground. A fault is declared when an imbalance in current is detected, and the relay trips the power circuit to protect the system from damage. The current imbalance is typically less than 10%, and if the imbalance is too high, the relay will automatically reset after the fault condition is cleared.

In summary, the SE-330-20-11 current differential protection unit is a comprehensive solution for motor protection . It features selectable current and time settings to detect and respond quickly and accurately to fault conditions. By monitoring for current imbalances between two phases or between phase and ground, it can detect a wide range of faults and protect the system from damage.