Directional overcurrent and earthfault protection and control


The GRE140 is a fully numerical multi-function directional overcurrent protection device designed for feeder protection applications in MV networks, drawing on proven technologies developed over more than 100 years, and providing a comprehensive range of protection and control functions. This compact and cost-effective device can be applied not only as feeder protection but also as back-up protections for HV/EHV equipment and feeder.

  • • Protecting feeders in medium voltage networks
  • • Backup protection for generators, transformers and feeders in high voltage networks
  • • Feeder manager device with CB control function, 43R/L switch and comprehensive supporting functions
  • • Compact and cost-effective design
  • • Elementary, environmentally-friendly, easy to use and enhanced product concepts

GRE140 has some models which differ according to the application and type of inputs fitted, see Table 1.

All models include multiple, high accuracy, overcurrent protection elements (for phase and/or earth fault) with inverse time and definite time delay functions. All phase, earth and sensitive earth fault overcurrent elements can be independently subject to directional control.

Table 1 - GRE140 Models

Model Configuration
GRE140-40*A Directional Three Phase Fault and Earth Fault
GRE140-42*A Directional Three Phase Fault, Earth Fault and Sensitive Earth Fault
GRE140-70*A Directional Three Phase Fault and Earth Fault and motor protection
GRE140-72*A Directional Three Phase Fault and Sensitive Earth Fault and motor protection

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 relayĆ¢s metering and recording functions.

Data available either via the relay HMI or communication ports includes the following functions.

  • Metering
  • Fault recording
  • Event recording
  • Disturbance recording

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