When switching the capacitors in the compensation systems with contactors, high switching currents of up to 200xIN occur. This shortens the lives of both the contactors and the capacitors. The capacitive load drivers switch the capacitor voltage and the bus voltage to equalize to prevent high switching currents. In addition, the condenser allows very fast switching without waiting for the discharge time to meet the reactive needs of the fast loads.
In cases where reactive changes are fast and large and unstable, contactor systems are inadequate to meet the need for compensation. In the compensation of these types of operations it is possible to respond to rapidly changing loads by switching with mechanical contactors in conventional systems instead of switching.
In thyristor systems, since the capacitors are activated in zero transitions, it is not necessary to wait for discharge times. Furthermore, since the current drawn when the capacitors are first switched on is the minimum, it is possible to switch on and off at a high speed.
With this system, the life of capacitor and switching elements is extended and power quality is positively affected. Maintenance costs are also reduced to a minimum.
The system can operate in both binary mode and normal mode depending on the power of the connected capacitors. If the capacitor arrangement is made so that each stage is twice the previous stage, the system is considered as binary. In binary mode, the selection of the capacitor is done much faster. If it is requested, the system which is to be created without a binary sequence is regarded as the relay normal mode and produces a solution accordingly.
The system detects the load change in 10 ms and makes it possible to switch within the next 10 ms. After the switching signal, the capacitor is switched on in the first zero transition (<20 ms). In this way, the response speed of the system is reduced to 50 ms.