FEATURES

TECHNICAL SPECIFICATION

OPERATION

Switching of the module is made in accordance with the external relay signal. When doing the switchings, the module exhibits a maximum of 20ms response time. The control algorithm, which is developed specially for eliminating any current or voltage transients, decides on the proper switching instant for fully transient-free operation after the relay signal changes its state from OFF to ON. This is done by unique decision methods developed with an academic approach. It is tested in field that, no harmonic current or voltage content is created if these decision methods are applied. The following figures show the fully transient-free operation of the module. The capacitor voltage waveforms are given together with the relay signal.

In the figures above, the blue waveform is the relay signal, the pink and green signals are the capacitor voltages. It is seen that, with almost no delay, the capacitor voltages follow phase voltages when the relay signal becomes HIGH. Similarly they become DC voltages for the relay signal being LOW.

SUMMARY of ADVANCED FEATURES of QuickVAr

• The control algorithm is fully software based and any modification can be made easily according to customers’ needs, if needed in the future.
• All of the operating principles of the thyristors, transient-free switching algorithm, the analog & digital parts of the control card are uniquely and academically developed by means of using many professional simulation software tools.
• QuickVAr is able to react to the relay signal within a period of 20ms at maximum.
• Overvoltage protection feature protects the capacitors and thyristors against unwanted input phase voltage disturbances.
• No current and voltage transients occur while the module switches ON and OFF (“Fully transient-free operation”)
• It does not need any discharge resistors.
• It can follow a relay signal of frequency 25Hz without any delay. It can switch the PFC bank in and out 25 times in a second consecutively.