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	13.8KV Auto Transfer System - Medium Application Complexity Siemens, the main contractor for this project, commissioned Soft Control Ltd to develop the Siemens PLC code to control this system. The Piper Alpha North Sea Oil Production Platform supplies electricity via two undersea cables to an unmanned Oil Platform, Saltire. The System had to ensure that Saltire made the correct decisions when choosing one of the undersea electricity supplies or opting for the onboard Emergency Generator Supply. The huge financial and production costs of a supply failure required the flawless performance of the Control System. The PLC was responsible for monitoring the operation of HV breakers on both Saltire and Piper Bravo. The final solution was achieved after extensive liaison with multiple responsible organisation and engineers. To ensure the PLC solution met all the requirements a witnessed simulation was performed allowing the observation of the entire system with a detailed O&M manual supplied. Personnel from Soft Control assisted in the commissioning of the equipment in the North Sea. PLC: Siemens S5