Digital Earth Leakage Relay By Navago Electronics & Electricals

PRINCIPLE OF OPERATION
This relay operates on core balance principle wherein the currents in the three phase of the system are summed by a core balance C.T. which for normal conditions equates to zero. In case of a leakage current to earth this balance is disturbed causing the electronic circuit to operate a relay within the unit. In this event the relay that is generally connected to circuit breaker operates thus tripping the main circuit. The electro mechanical relay operates on fault. The Earth Leakage Relay is provided with a TEST push button for checking its operation and a RESET button to reset the relay. This helps in checking the proper functioning of the relay. External (remote) TEST and RESET connections is also be provided.

FEATURES
a cMicrocontroller based design
a c16 character 2 line LCD display
a c Continuous displays of the set current and time delay and actual leakage current
a cWide range of leakage setting from 30 mA to 30 Amps
a cContinuous monitoring of CBCT connection, TRIPS when disconnected
a cTest and Reset for checking functioning of relay
a cExternal TEST and RESET connectors provided
a cCurrent measurement using True RMS values
a cEasy and user friendly procedure of setting the Leakage current and time delay

SETTINGS

To set Leakage and Time delay, press SELECT button set the desired leakage current (from 30 mA to 30 A) by turning the potentiometer press SELECT button to confirm. Then set the time delay required by turning the potentiometer and press SELECT to confirm.

Leakage Settings: 30 mA to 30 Amps
Time Delay: 0 to 50 secs
Mounting 96 sq mm Panel door mounting
Auxiliary Supply: 80 to 280V or 110V Ac or 230V Ac or 415V Ac or 550 V Ac
CBCT ID : Tape wound or resin Cast