capacitorShown at left is a dual-bushing single-phase dual-bushing medium voltage capacitor.  In North America the primary manufacturers are Cooper Power Systems (Eaton), GE, and ABB.  These Capacitors are designed for use in shunt on AC power circuits.

Capacitors are rated for use at a maximum voltage, frequency (50 or 60 Hz) and have a rated capacity in microfarads (uF). 

T-Star recommends use of standard heavy-duty capacitors rated 1 BIL level higher than normal for a voltage class rating. 






iron core


Shown at left is a single-phase dual-bushing medium voltage reactor used as a harmonic detuning filter.  These are customer manufactured throughout the world.

Reactors are rated for use at a maximum voltage, design frequency (50 or 60 Hz) and have a rated capacity in millihenries (mH). 

T-Star generally recommends design/use of an ungrounded core design with adequate saturating current levels.





Because capacitor failure results in a short circuit, each medium voltage capacitor is individually fused fused with an appropriately rated fuse designed for capacitor applications.










Reactors valves caps



Shown at Left are components in a Dynamic VAR System.  The large dark components are the harmonic reactors.  The Medium Voltage Capacitors are shown underneath the reactors.

The fuses have been removed for this photo.  The bottom fuse clips are seen on the top capacitor bushings.  The top fuse clips are shown on a common busbar above the capacitors.

The semi-circular plastic tubes are connected to isolated micro switches to allow for easy location of failed fuses/ capacitors which should be checked.

The rectangular cans topped by gray bushings are the Static Valves.  See Proprietary components for further explanation.