Re: Difference Between Earth Fault Relay and Earth Leakage Relay?
05/10/2010 12:29 PM
Assuming you are refering to MV switchgear and not the "relay" you find on a DB in a home
Earth Fault Relay - Detects ground faults on a feeder
Earth Leakage/Frame leakage - This is a type of busbar protection. The switchboard must be fully isolated from earth (including cable glands and station earth). The switchgear is also installed on top of an insulation material. A single earth connection is then taken from the board to the station earth and is monitored by a relay (frame leakage protection relay) via a CT.
Re: Difference Between Earth Fault Relay and Earth Leakage Relay?
05/10/2010 11:59 PM
Basically both are same.......earth leakage relay are sensitive earth fault relay. both
are working same principle residual current method.first
one is we r using CBCT second one is ordinary CT.
Re: Difference Between Earth Fault Relay and Earth Leakage Relay?
05/11/2010 8:23 AM
Earth fault relay is operated based on the neutral current, which measures the unbalance current level and the phase to earth schort circuit current level.
Earth Leackage relay is to detect the leakage current in the load, which the leakage current directly flows through the earth/ ground, not via neutral. this can be measred by using the CBCT, which measure the vector sum of the all phases and the neutral( ideally it should be zero).
REF - Restricted Earth Fault relay, is also similar to the function of the Earth leakage relay, but the difference is in the sensing part, which is used for HT circuits.
Re: Difference Between Earth Fault Relay and Earth Leakage Relay?
03/29/2015 12:46 PM
Earth fault is when a phase conductor makes contact with the neutral (for earthed system) or ground potential. Earth leakage is when there is a fault current from Live to the Earth. Most recent installation uses Residual Current Breaker(RCB) which detect leakage current directly disconnects the circuit whenever it detects that the electric current is not balanced between the energized conductor and the returning neutral conductor.Read more about Earth leakage relay and earth fault relay
Difference Between Earth Fault Relay and Earth Leakage Relay?
Re: Difference Between Earth Fault Relay and Earth Leakage Relay?
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