LV Systems

Potential Transformer

A potential transformer maintenance in a LV Panel board is less since heavy current does not flow through it and the defect as well as fault is generally very low.That is why monthly maintenance of voltage transformer may not be required. Moreover very frequent maintenance of bus PT may not also be possible as far taking shutdown of such PT total bus section would be out of protection and metering.

Preventive Maintainence of Current Transformer

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