I assume you need to convert star to delta and vice versa...
The program in link do this and a lot more!
microsoft.handango.com/PlatformProductDetail.jsp?siteId=75&jid=88A5D8F66F1DE8438X1369E8F5DFEE73&platformId=2&productType=2&catalog=0§ionId=0&productId=80730