Sepam - HV/MV Protection and control units (ENG) - Trinet

InstallationUse and connection of split core balance CTsPO, GO split core balance CTsThese core balance CTs are used when it isimpossible to dismantle the cables.They are connected to the Sepam 2 A or 30 A ratinginput.c Transformation ratio 1/470.DimensionsØø 5BLHdimensions (mm)weight (kg)Ø H L BPO46 72 148 57 1.3GO110 78 224 76 3.2Assembly of core balance CTsc Install the core balance CT with the cables groupedin the middle.c If unwanted tripping occurs due to occasionalcurrent surges or motor starts:a) core balance CT ø = 2 x cable øb) magnetic sleeve - L = core balance CT ø.(a)(b)LConnection of splitcore balance CTsTo measure residual current up to 20A,connect the core balance CT to the “2A rating” input.To measure residual current up to 300 A, connectthe core balance CT to the “30 A rating” input.ECA/ECMDPCREF30 A rating2 A ratingcore bal. CTAA6A5A4A3A2A1S2S1P1P2S2S1P1P2core balance CT1 2 3earthed metalliccable shieldingSelection of operating mode(microswitches)1 2 3Cable shield earthing.c Set the corresponding Sepam 2000 switches SW1.The switches concerned are found on the inputmodule.They must be set while Sepam 2000 is de-energized.The microswitches may be hidden by the CCA660or CCA650 connector when it is installed.SW2SW1for measuring residual currentby split core balance CTsInstallation - Use - General characteristics - Testing1/15