Composite Switch And Synchronous Switch For Reactive Power Compensation

A composite switch is a device that connects thyristors in parallel with relay contacts. However, composite switches use both thyristors and relays, making the structure more complex and costly. Additionally, due to the sensitivity of thyristors to overcurrent, overvoltage, and dv/dt, they are also more susceptible to damage. In practical applications, faults in composite switches are mostly caused by damage to thyristors
Synchronous switch is the latest technology developed in recent years, as the name suggests, it is to accurately close or open the contacts of mechanical switches at the required time. For synchronous switching of control capacitors, it is necessary to close at the moment when the voltage at both ends of the contact is zero, in order to achieve no inrush current input of the capacitor, and disconnect at the moment when the current is zero, in order to achieve no arc breaking of the switch contact. Due to the omission of thyristors in synchronous switches, not only is the cost reduced, but the reliability is also improved. Synchronous switch is a product of the perfect combination of traditional mechanical switches and modern electronic technology, which fully demonstrates the high reliability and low loss characteristics of mechanical switches while possessing unique technical performance.