Question related to Slack bus ( help please ) !! Can we set the MVAR limits of a Slack bus as Zero ( for both MAx. and Min. limits ) during operating load flow program !? and what does the minus sign exactly mean when it's written in the limit , such this one : Qmin. (MVAR) = -42.7 Qmax. (MVAR ) = 97 if the slack generates -373....did the limit is already exceeded !? PS : excitation is 105% thanks for your attention.