Earth leakage relay
Earth leakage relay
(OP)
I have a submersible 8kw pump protected by an earth leakage relay set at 30ma instantaneous. The pump starter 1000v supply has an earth leakage set at 200mA instantaneous.the 1000v volts comes from a 11kv/1000v skid muonted substation with an earth leakage set at 2A at the hv switch.water got into the pump contact block and the 11kv earth leakage set at 2A tripped first before the 200mA and 30mA.was it because of 3phase to ground fault.scratching my head coz as a sparkie I hve to give a repor.Help please.





RE: Earth leakage relay
RE: Earth leakage relay
RE: Earth leakage relay
Each Earth Leakage Relay, on my assumption that they operate the same as a Ground Fault Interrupter (GFI), uses a simple transformer core basically in common mode to detect a net difference in current between the Hot and Neutral; both sides of the circuit passing through the same core, cancelling except for the difference (ground leakage). Any ELRs further down the circuit from the fault cant't detect any difference because they're not installed in the part of the circuit where any difference exists.
RE: Earth leakage relay
RE: Earth leakage relay