Customized SCADA System for Low Voltage Distribution Automation System

This paper presents a customized SCADA at customer side distribution automation system (DAS) for operating and controlling low voltage (LV) down stream of 415/240V by using the Tenaga Nasional Berhad (TNB) distribution system. An embedded Ethernet controller is used as RTU to act as converter for HMI to interact with digital input and output modules. RTU is the master and digital input and output modules are the slaves. RTU will initiate the transaction with the digital input and output modules. Proprietary software is used to develop algorithm for the controller and to develop HMI for monitoring and controlling functions for the operator. The SCADA system software includes software modules such as graphic editor, database setup, alarm configuration, trending tools and communication setup. HMI monitoring system is correctly showing the fault point and generates the correct alarm messages for the operator to be acknowledged. The SCADA system developed provides automatic fault isolation, monitoring and controlling functions for the operators and data collection for future analysis.