Online monitoring and testing system for Nickel-Cadmium battery — A smart grid application

110V Nickel-Cadmium batteries had been in use in TNB substation as standby supply to operate a relay when a fault occur in a downstream electrical equipment so that the fault would not trip an upstream substation. Recently, due to interest in Smart Grid technologies for asset management and testing, the online battery monitoring application is studied in Tenaga Nasional Berhad. Important battery condition parameters such as floating cell voltage, temperature and internal resistance are gathered from the site and sent to TNB Research laboratory, about 30 km away via a private fibre-optics network. This paper compares the result of remote monitoring and discharge test system with manual testing system.