Earth 4.0
The Earth 4.0 is an earth fault indicator. It is designed to detect, locally indicate and remotely report earth fault currents in medium voltage distribution networks. A wired earth fault current transformer monitors the summation current of all three conductors.
The electronics of the display unit evaluates the measurements. When the fault sensitivity threshold is exceeded, a red LED will start flashing and a mechanical flag becomes visible. In addition to that, the remote indication contacts are energised.
A system-specific external signal lamp is optionally available.
Equipment set includes:
- 1 display unit
- 1 summation current transformer
- Indication of earth fault currents by LED and mechanical flag
- Remote indication, test and reset via relay contacts
- Battery status indication and remote indication via relay contact
Your advantages
- Clear earth fault indication via LED and mechanical flag
- Connection to remote monitoring
- Early warning of battery end-of-life
Technical specifications
| Earth fault detection methods | Earth short-circuit |
|---|---|
| Low-impedance/short-term low-impedance earthed | --- |
| Isolated earthed | --- |
| Resonant earthed | - |
| Earth short-circuit trip current | 25, 50, 60, 80 A |
| Response delay earth short-circuit | 80, 160 ms |
| Trip current transient method | - |
| Trip current active current cos ɸ | - |
| Response delay active current cos ɸ | - |
| Trip current reactive current sin ɸ | - |
| Response delay reactive current sin ɸ | - |
| Trip current permanent earth fault | - |
| Response delay permanent earth fault | - |
| Trip current pulse detection | - |
| Indication | 1 red LED, 1 yellow LED (battery status), mechanical flag |
| Relay contacts | 3 |
| Remote contact | Potential-free permanent and momentary contact (1 s) Contact capacity: 230 V AC/1 A/62.5 VA max. 220 V DC/1 A/60 W max. |
| RS485/Modbus-RTU | - |
| USB port | - |
| Binary inputs | - |
| Ethernet interface | - |
| Manual reset | --- |
| Remote reset | --- |
| Automatic time reset | --- |
| Reset via interface | - |
| Reset on current restoration | - |
| Reset on voltage restoration | --- |
| Reset on restoration of auxiliary supply | - |
| Reset via Explorer Software | - |
| Internal power supply | Long-life lithium cell, shelf life ≥20 years, total flashing time ≥1,200 h |
| External auxiliary supply | - |
| CT powered | --- |
| Housing | Polycarbonate, IP65 |
| Temperature range | -30 to +70 °C |
| Cable diameter | - |
- Earth fault indication by LED and mechanical flag
- Battery status indication
- Test/Reset function
