MV Systems

Current Transformer

A Current Transformer or CT is very essential equipment installed in an electrical substation for electrical measurement and protection purpose. If a current transformer does not perform properly, there may be huge disturbance in the system due to malfunctioning of protection relays. So far accurate measurement and smooth operation of electrical power system, CTs must be properly maintained. Preventive Maintainence of Current Transformer

• Insulation resistance of the CT must be checked
• Thermo vision scanning of primary terminals and top dome of a live CT should be performed
• All the CT secondary connections must be checked, cleaned and tighten
• General checking of CTs for any abnormal condition