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Synchronous switching, often referred to as “zero-close” switching is a technique that can be used to help eliminate the disturbances that can occur when connecting or disconnecting capacitor banks to an active distribution feeder. When a shunt power factor capacitor bank is energized, during the first cycles of operation the capacitor initially appears as a short on the distribution system. Large transient inrush currents and harmonic resonance can occur which can be disruptive and damaging to other attached equipment and can adversely impact the quality of electric service provided to a utility’s customers.
In applications where large banks are installed near existing sensitive processes or equipment, this disruptive resonance can cause improper operation of variable speed drives, computers, and other sensitive equipment. As a result, industrial processes can be disrupted causing equipment damage, expensive batch loss or even regulatory compliance issues caused by process instability.
Trinetics UltraSync switches together with the Z-Cap control provide consistent best in class performance for synchronous close switching applications. Additional benefits include quick easy commissioning, and “drift-free” performance. 200A and 400A switches are available for 15kV, 25kV and 35kV grounded wye applications.