Sepam series 10 - Schneider Electric

Sepam Series 10 - Functions and ParametersEarth Fault Current MeasurementApplicable toSepam Series 10NB ADescriptionThe earth fault current measurement function can be accessed in the metering menu. It displays thevalue of the earth fault current fundamental. Both the earth fault current measurement and the earthfault protection (ANSI 50N-51N) require the core balance input to be connected because Sepam doesnot calculate the earth fault current by an internal sum of the 3 phase current measurements. This inputcan be connected to the common point of the 3 phase CTs or to an earth CT or to a CSH120, CSH200or GO110 core balance CT.On Sepam series 10 A relays, the earth fault current measurement can also be accessed via thecommunication.Each of the Sepam models is available in several versions depending on the desired sensitivity for theearth fault current measurement. The earth fault current measurement input connection diagram andassociated settings depend on the Sepam type. For more information, refer to Connection Diagrams,p. 30.126 SEPED307003 02/2008