The Q-U protection function can be tested fully automatically with the QU-Monitor. The QU-Monitor supports various different response characteristics for the Q-U protection function implemented by the manufacturers of protection devices.
As well as verifying the tripping characteristic, it is also possible to check the pick-up and and drop-off values of the protection relay for the undervoltage threshold, the minimum current, the minimum reactive power and the angle range of the reactive power direction. Selecting a fault loop makes it possible to reproduce phaseselective fault types as well. This allows the undervoltage threshold and the function of the logical AND-link to be checked in one test step.