2C138 SEF Relay

The main earth fault protection relays in distributions systems, power stations & large manufacturing / processing plants can fail to detect a high impedance breakdown to earth causing hazard to human life & potential damage to plant & equipment. In these & other situations demanding extra sensitive earth fault protection, the 2C138 relay using solid state techniques, can be applied to detect earth currents down to 0.5% of the CT nominal current.

The relay is tuned to reject 3rd & higher harmonic frequencies to avoid problems under quiescent conditions. An adjustable time delay is built in to provide stability during switching & other transient disturbances & to allow adequate grading with other protection systems at high fault current levels.

Features

• High sensitivity (0.1% of Is)
• 3rd harmonic & HF noise suppression
• Tuned to 50 Hz
• Optional reset functions: Instantaneous (Fast), definite time, count down
• 40-300V DC aux. supply
• 20-70V DC aux. optional
• Low CT burden & high thermal rating
• Optional 1A or 5A CT input
• Instantaneous pick up LED
• Configurable output contacts
• 0-31s time delay (125ms steps)
• Push button / electrical flag reset
• Non-volatile trip indication
• Multi voltage inhibit / enable input
• Multi voltage flag reset input
• Auxiliary supply fail alarm
• Flush or rack mount draw out case
• Made in Australia