Medium-Voltage Solutions

VarStec harmonic filter banks provide reactive compensation, harmonic mitigation, and resonance prevention in one integrated, metal-enclosed system. Each solution is engineered to the site’s actual harmonic environment, using the appropriate filter topology to improve power quality, support voltage, and reduce distortion-related risk in demanding industrial and utility applications.

VarStec capacitor banks provide reliable medium-voltage power factor correction and voltage support through fully integrated, metal-enclosed designs. Each system is custom-engineered to the project’s load profile, switching duty, and site conditions, helping reduce losses, improve voltage performance, and minimize field installation risk through factory-tested integration.

VarStec Hybrid STATCOM solutions combine the speed of a STATCOM with the economy of switched capacitor or harmonic filter stages. The STATCOM delivers fast dynamic VARs for voltage sag mitigation, flicker control, voltage stability, and rapid system response, while the switched stages provide the slower, bulk steady-state VARs needed for power factor correction and long-duration support. This coordinated approach is well suited for sensitive facilities, weak grids, and plants with large motor starting demands, including plant-wide support for across-the-line motor starts. By blending fast and slow VAR resources into one system-fit solution, VarStec improves performance while lowering installed cost compared with an all-STATCOM solution.

MotorVAR™ provides fast, transient-free reactive power during large motor starts to help maintain voltage and preserve starting torque. Built as a fully integrated, metal-enclosed system, it offers a simpler and more maintainable alternative to VFD- and RVSS-based starting approaches for large medium-voltage motors.

VarStec surge protection products protect motors, generators, transformers, and other medium-voltage equipment from damaging transient overvoltages caused by lightning, switching, and system disturbances. These system-fit solutions help limit insulation stress, reduce equipment failures, and improve long-term reliability in critical power system applications.