The amount of power that can be transferred through long overhead transmission lines is often limited by impedance, which can lead to voltage drops. For decades, fixed series compensation has been the proven solution to maintain a minimum voltage profile and maximize the utilization of transmission lines. Siemens Energy fixed series capacitor (FSC) technology addresses these challenges by increasing voltage at the connection point, reducing transmission angle and line voltage drops, and improving power transfer capability and system stability.
FSC works by connecting a capacitor bank in series with the transmission line to partially compensate for the inductive impedance of the line. This setup increases the voltage at the point of connection, enhancing the overall efficiency of power transmission. The capacitors are protected by metal-oxide varistors (MOV) and, in case of a fault, the FSC is tripped and the bypass breaker is closed. For instant protection, a triggered spark gap bypasses capacitors and MOVs within less than 1 ms. Gap-less solutions are also possible, provided that local requirements match.
Due to the complexity and precision required, Siemens Energy recommends and offers individually designed solutions with fixed series capacitors, ensuring optimal performance tailored to specific grid needs.
