In addition, GRE140-40* and 42* provide multi-shot, three phase auto-reclose with/without synchronizm check, with independent sequences for phase fault, and earth fault and sensitive earth fault. Auto- reclosing can also be triggered by external protection devices. GRE140-70* and 72* provide high accuracy motor protection elements such as thermal protection based on IEC 60255-8, motor status monitoring, locked rotor protection, restart inhibit and temperature calculation on current basis.
Other protection functions are available according to model type. See Table 2 for details of the protection functions available in each model.
All models provide continuous monitoring of internal circuits and of software. External circuits are also monitored, by trip circuit supervision, CT and VT supervision, and CB condition monitoring features.
A user-friendly HMI is provided through a backlit LCD, programmable LEDs and menu-based operating system. PC access is also provided, either for local connection via a front-mounted USB port. The communication system allows the user to access data gathered by the relayâs metering and recording functions.
Data available either via the relay HMI or communication ports includes the following functions.
- Fault recording
- Event recording
- Disturbance recording