What software you use for HV/LV Protection Grading Studies?

Hi there, I would like to get myself involved with HV/LV Protection Grading studies as I work on site with a private 11kV network but so far in my career I never had a chance to work in this field. I was wondering what software you guys use for this purpose and perhaps what training would you recommend to get me started? Both to get a grip of basics what to consider in protection studies between HV/LV and how to use particular piece of software to make calculations.