SE-330AU-08-00 Datasheet/PDFSE-330AU-08-00 is a Universal overcurrent protection relay designed to protect transformers, motors, generators, lines, shunts, cables and other electrical systems. This advanced protection relay is capable of many protective functions, including instantaneous overcurrent protection, selectable time delay overcurrent protection, neutral overcurrent protection, reverse power protection, voltage unbalance protection, thermal protection, and detection of earth fault down to zero residual current. It also offers start/stop control, adjustable current setting, and phase angle protection.
These features make the SE-330AU-08-00 a powerful protection device capable of protecting various electrical systems from various fault conditions. The integrated protection algorithm offers a wide range of operational performance, ensuring that the protective responses are optimized for each protection task.
In terms of working principle, the SE-330AU-08-00 uses a four-stage overcurrent protection system. The first two stages are the instantaneous overcurrent protection (IoC) and selectable time delay overcurrent protection (TDR). This combination ensures quick and reliable protection against all types of short-circuit faults. The two other stages, neutral overcurrent protection (NOC) and reverse power protection (RPP), provide additional protection for fault conditions involving network grounding, disconnected neutral, and reversed power flows. The SE-330AU-08-00 is also equipped with an independent voltage protection system. This system monitors the shape of the incoming voltage waveform and detects high- or low-side voltage trips. The integrated voltage protection algorithm also handles unbalanced voltages, enabling the SE-330AU-08-00 to protect against fault conditions resulting from unbalanced system loads.
In addition to providing protection, the SE-330AU-08-00 also offers an adjustable current setting feature. This feature allows users to adjust the trip current of the IoC and TDR stages, thus helping to optimize protection settings based on the application. It also helps to ensure that protection can be set at the most appropriate level yet remain within the capabilities of the system.
The thermal protection feature, which is built into the SE-330AU-08-00, helps to protect the device itself against excessive heat generated by continuously operating electrical systems. This feature measures the temperature of the relay and will trip out the system if the temperature exceeds a pre-set limit.
Lastly, the SE-330AU-08-00 is capable of detecting earth fault down to zero residual current. This is achieved by monitoring the phase angle and magnitude of the current flowing in the system. If the detected current is zero, then an earth fault is detected. This feature helps to provide additional protection against earth faults which may occur without the presence of an overload current in the system.
The SE-330AU-08-00 can be widely used in industrial environments and is suitable for protecting critical equipment like transformers, motors, generators, lines, and cables. It offers reliable, accurate, and fast protection with its integrated algorithm and adjustable current settings. Therefore, the SE-330AU-08-00 is the ideal choice for many electric system protection applications.