About ABB RET316 4 RELAY

 ABB RET316*4 RELAY 

Features One three-phase differential function for two- or three-winding transformers No interposing CTs Current compensation of ratio and phase Programmable facility on inputs and outputs to provide trip and/or indication of external protection features (Buchholz, temperature, etc.) Overcurrent stage in differential circuit Overcurrent functions on high- and low voltage side Directional inverse and definite time overcurrent protection Overvoltage function (by adequate hardware version) Thermal overload function Distance protection- Overcurrent and underimpedance starters- Five distance zones (polygon for forwards and reverse measurement)- V.t. supervision- Power swing blocking- Load-compensated measurement Overexcitation Frequency Rate-of-change of frequency Breaker-failure protection Standard wiring diagram regardless of power transformer group Compact design, few hardware units, part of the 316-family Modular software Continuous self-monitoring and diagnosis Fully numerical signal processing Menu-driven user interface program CAP2/316 based on Windows Additional project-specific logic functions can be programmed with CAP316 Event recording and measuring values Three serial interfaces:- Front port connector for local connection of a personal computer- Back plane interface for remote communication with a station control system: LON, IEC 60870-5-103, MVB, SPA- Back plane interface for process bus: MVB Available for 19" rack mounting in a panel, surface or flush mounting Four independent, user-selectable parameter sets able to be activated via binary input Multi-activation facility of the available functions

MV and HV systems with distance or longi-Load-compensated measurementIndependent measurement per phaseeatures

Application

MV and HV systems with distance or longi-Load-compensated measurementIndependent measurement per phase-inrush restraint function