.png)
Current Protection
2C138 Sensitive Earth Fault Relay
Features
-
High sensitivity (0.1% of Is)
- 2nd & 3rd harmonic & HF noise suppression
- Tuned to 50 Hz or 60 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
Description
The main earth fault protection relays in distributions systems, power stations & large manufacturing / processing plants can fail to detect a high impedance break down 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 2nd & 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.