Automotif Transfer Scheme (ATS) experience in Tenaga Nasional Berhad Distribution Negeri Perak

Abstract

Electricity is distributed to most large power/important consumers via, at least, two feeders of underground/ overhead cables. Generally, the main cable is operational while the other is on standby as backup with the bus-section CLOSE. Other configurations such as having both incomers CLOSE and the bus-section OPEN, and no bus-section are also practised. In the event of a fault in the main cable, the switch to transfer load to the backup cable will be done either manually or remotely via control centres. The process might take anywhere from one hour or longer especially during peak hours or night time. Automatic Transfer Scheme (AT S) is designed to perform safely the automatic switching to minimise interruption down to approximately 1 sec or faster. Remedial work on the faulty cable or equipment can be done at a later time. System normalisation is designed to be done manually.