PROBLEM OF SPILL CURRENT WITH RESIDUALLY CONNECTED C.T.s DOES NOT EXIST WITH C.B.C.T NO NEED OF STABILISING RESISTOR AS C.B.C.T. OPERATES ON FLUX BALANCE PRINCIPLE PICK UP SETTING AVAILABLE ARE LOW ENOUGH TO DETECT GROUND FAULT CURRENTS OF FEW AMPS e.g. MINIMUM PICK UP AVAILABLE FOR CTMM / SPACOM : 10 MILLIAMPS HIGH RESISTANCE GROUNDED SYSTEM CBCT APPLICATION EARTH FAULT (ZERO SEQUENCE) PROTECTION KR

EARTH FAULT (ZERO SEQUENCE) PROTECTION HIGH RESISTANCE GROUNDED SYSTEM FOLLOWING INFORMATION SHALL BE FURNISHED TO C.B.C.T MANUFACTURER OUTER DIAMETER OF CABLE OR CABLE SIZE MINIMUM PRIMARY GROUND FAULT CURRENT TO BE DETECTED RELAY BURDEN AND SETTING RANGE OF RELAY CAUTION : DURING INSTALLATION, BEFORE THE CABLE ENTERS C.B.C.T, CABLE ARMOUR HAS TO BE EARTHED; OTHERWISE GROUND FAULT CURRENT FINDING PATH THROUGH ARMOUR RESULT IN NON-OPERATION OF THE C.B.C.T KR

I.M I.M I.M 50N 50N 50N i = 0 i = 0 i = 0 APPLICATION OF CBCT EARTH EARTH EARTH FAULT FAULT FAULT APPLICATION OF CBCT CORRECT POSITION OF ARMOUR EARTHING KR