Because the orginal NARI's equipment is no longer produced. The AC and DC panel can not work normally as there is no replament can be used in the maintenance or emergency repairs.  That brings hidden danger to the safe operation of power supply equipment. The upgrade and reform is significant.

			TTMA03 AC switching unit		TTMB03 Battery measurement unit		TTMD03 DC monitoring unit
			TTMJ03 Insulation monitoring unit		TTMP03 Intelligent AC monitoring unit		TTM03 Main monitoring unit
			TTEP-11010 High frequency switching rectifier module