Alas! If you are a coal mine technician, it is not good for the administrator to ask such unprofessional questions. It was drawn with cad software. Underground power supply, ventilation, drainage, communication, disaster prevention, underground control system diagram and so on * * *1/all kinds of drawings are inseparable from cad. First of all, you can learn this software and find someone who knows about coal mines to give you some advice. If you need an electronic version of the power supply system diagram, contact me and I will give it to you.