I need some input on some good power quality devices that can be installed in a main distribution panel to protect against surges, spikes, etc. We have a lot of linear and non linear loads, which both need protection. We have spent over $30,000 in the last 8 months on ballast, motors, vfd's and led lighting due to this ongoing problem. What gets me though is we have TVSS's and other surge protection equipment in place already doesn't seem to help the problem, which has been going on for several years but not to this extent. Any thoughts or ideas would be greatly appreciated, this one has been kicking my @$$ for awhile now.