A SCADA System to Analyze Harmonic Currents Propagation

Equipment located in HVDC stations such as passive filters usually trip in the presence of sufficient high currents flowing for a given period of time. In these cases, a study of the origin and path followed by these currents may be of great interest when identifying and taking alleviating actions. This task is suited to be accomplished by a SCADA (supervisory control and data acquisition) system, specifically designed to measure and analyze currents passing through the bus where the element to be protected is connected. This paper describes the architecture of such a system, including hardware, network and software components, as well as a didactic example and an on-going real implementation in the Brazilian HVDC system.