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Earth Loop Voltage Detector(ELVD)

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EARTH LOOP VOLTAGE DETECTOR WITH BREAKER

Shock PreventorFrom day one, electric power helped people do their day to day work efficiently. Electricity also made their life more enjoyable and comfortable as invention after invention found their way into people’s homes: fan, air-conditioner, grinder, toaster, hot plate, blender, washing machine, water heater … However, incidences of electric shock while using the appliances also started increasing.
During early days electricity was distributed with two wires (Phase and Neutral), with a fuse to protect the installation. This arrangement was protecting the over load on load side but not the fatal electric shock that could cause death of the user.
With the advent of electronics and its development, lots of new components were developed that are used in industrial electronics to control power. These components can sense voltage at very low levels and amplify the same to operate other circuits accurately.
These components are now used to protect people from electric shock by sensing the Earth Loop Voltage. This newly invented product is called Earth Loop Voltage Detector (ELVD) with a circuit breaker without the need of earth connection.
This device does not depend on the goodness of earth connection with the appliances as is the case of three wire systems. In fact, ELVD can be used even when two wire system of power and distribution is functional.

HOW THE ELVD IS THE SAFEST WAY TO PROTECT YOUR LIFE

• An intelligent sensor in the ELVD senses and compares the voltage of the neutral and the earth terminals (Body) of the appliance.
how elvd works • If the voltage level or fault signal exceeds 75V, a positive signal is sent to the circuit breaker to cut the power only to the faulty appliance. All other lights and electrical appliances in the home continue to function normally.
• All that needs to be done to restore power to the appliance is to restart it after rectifying the fault in the appliance.
Foolproof system: Until the fault has been fixed, ELVD will not allow the faulty appliance to be powered.

SPECIAL FEATURES:

1. Even if ground neutral loop resistance is high or open and consequent voltage rise happens between the neutral and body of appliance, the ELVD disconnects the appliances from power supply, when the appliance is faulty.
2. Instantaneous operation i.e. Disconnects appliance in less than 10 milli seconds.
3. No separate DC. power source.
4. No maintenance.