Earth fault monitoring
Benefits of our earth fault relays
- Early detection of fault current and insulation faults
- Monitoring both + and - conductors in DC systems
- LED status indicators for quick fault localisation
- High accuracy and noise immunity
- Ideal for solar PV, UPS and critical DC installations
Earth fault monitoring
Earth fault relays for monitoring fault current in DC installations
Fault currents and earth faults in large DC installations can cause serious operational issues, equipment damage and increased risk of personal danger. With our range of earth fault relays - also known as residual current relays - you get a reliable solution for continuous monitoring of earth faults, leakage current and insulation faults in e.g. solar farms, UPS systems and battery storage facilities.
Our relays detect even small changes in current flow and provide early warning of faults in both + and - wires. Several models also allow for fault detection in branched systems, making troubleshooting faster and more accurate.
Here is a selection of our many relays for earth fault monitoring - Contact us to learn more
Power AC
DACB-DACC
3-channel AC earth fault relay, DACB-DACC
Compact and accurate relay for monitoring earth faults in TN, TT and IT networks. Detects leakage currents early and enables preventive maintenance in industrial installations.
Benefits:
- IEC 60755 Type A and IEC 62020-1 compliant
- Measures real r.m.s. differential currents in AC systems
- Three independent channels with external measuring coils up to Ø150 mm
- Four fixed or infinitely adjustable set points (2-300 mA)
- Adjustable delay, hysteresis, latch function and LED status per channel
IMAA
Benefits:
- For alternating current (AC)
- Differential current (earth fault) measurement with manual 30 mA test function
- 12 programmable measuring ranges for over- or undercurrent
- Individually adjustable switch-on and switch-off delay
- Relay function can be reversed (normal/inverse)
Power DC
DDCA
DC current leakage relay - DDCA
The supply cables are mounted directly through the hole in the relay. This enables detection of fault currents in both the + and - wire. Faults can be the result of poor insulation, for example.
The built-in measuring transformer eliminates the need for shunts and the resulting voltage drop and heat generation.
Benefits:
- Both ungrounded systems and systems with grounded centre voltage
- Built-in measuring coil, Ø12.5 mm and Ø28 mm
- Detects fault currents in the range 5-200 mA
- Supply range 18-340 VDC
- Directional output signal (12 ± 8 mA) and LED indication
- Relay function: 2 x C/O (fault from + or -)
- Adjustable time delay for ON and OFF
DDCB-DDCC
Alternative solution for thicker cables using an external measuring coil, Ø50 mm or Ø90 mm.
Benefits:
- Detects earth current leakage in DC supply systems (IT grids) by differential current measurement
- Shows if the error is related to the positive or negative leader
- Measuring coils available for cables up to Ø90 mm
- Configurable trip levels and alarm outputs customised to application requirements
- High immunity to false tripping caused by noise and electromagnetic interference
- Wide DC supply voltage from 18 to 340 V
- Directional 12 ± 8 mA output and LED indication for monitoring and easy troubleshooting
DDEA
DC earth fault monitoring - DDEA
When using an artificial earth, the relay detects fault currents from the + or - side to earth. This can be the result of direct shortage or poor insulation.
Benefits:
- Detects fault current in the range 0.2-30 mA
- Actual fault current shown in 3.5” LED display
- Supply range 20-500 VDC
- Programmable delay
- Relay function: 2 x C/O (fault from + or -)