Voltage Frequency Protection Relay

RD1 ELR

Earth Leakage ELR & Ground Fault Relay

The Earth Leakage Relay RD is a microprocessor-based electronic protection device designed to detect low-level current leakage.

The fundamental feature of the RD is to allow preventive control of the system's insulation with continuous displaying of the earth leakage current obtained by the use of a ring-type current transformer.

Modbus communication is available.

Functionality

• Digital display of earth-leakage current in Ampere or in percentage of Trip level.
• Independent current adjustments for alarm and tripping from 30 mA to 10 A.
• Independent time adjustments for alarm and tripping, from 0.03 to 5 sec.
• 2 Output relays: TRIP and ALARM, “latch” or “pulse” mode.
• Service function (Alarm relay).
• Indication and storage of the maximum fault current in a non-volatile memory.
• Manual or automatic reset. The automatic reset is lockout after 3 automatic operations in a period of time less than 9 minutes.
• Remote Reset input.
• Test button for output relays and leds.
• Continuous control of CT wiring connection.
• High immunity to external disturbances and harmonic current components.
• Its function is also guaranteed with alternate sinusoidal and continually pulsing currents.
• Menu on the front panel.
   

Protection

Current transformers