Static contactors are indicated for installations where load fluctuations are important and fast. In these installations, conventional electromagnetic contactors do not allow the bank steps to be connected and disconnected quickly enough. Also, the current transient generated by the electromagnetic contactors at the moment of connection can damage the capacitors, reducing their useful life. In such cases, the ideal solution consists of applying these static contactors, for the connection and disconnection of the battery capacitors. The advantages of using static contactors in capacitor banks allow:
• The use of static contactors is the best solution in those cases where the connection of the capacitor is required quickly and without a starting transient. The connection occurs at the precise moment when the voltage crosses zero.
• Disconnection of the capacitor without transient voltage or current. The disconnection occurs when the current descends through zero.
• Practically immediate connection time (max. 10ms per phase)
• Offers better response and service from the capacitor bank.
• Lower maintenance cost.
• Immediate response to the demand for compensation. This condition is unattainable with conventional equipment with contactors and is essential for loads such as spot welding machines or small cords, elevators, cranes, ovens and, in general, those that present short load cycles.
• The following graph shows the voltage waves (Vc) and the intensity (Ic). It must be taken into account that in electromagnetic contactors traditionally, there is no concrete point of connection and disconnection.