我厂职工住宅区始建于1969年。现有住宅30幢,住户1000余户。近几年随着职工家里家用电器的日渐增多,原有的供电线路已严重超载,须进行增容改造。首先要解决的问题是,住宅区供电变压器容量选多大比较合适?选大了,造成线路投资增大;选小了,配电设备超载,影响用电安全。为此,我们对职工家庭进行了解,经摸底调查,每家大致有以下一些家 I plant employees residential area was founded in 1969. 30 existing residential buildings, more than 1,000 households. In recent years, with the increasing number of domestic appliances for workers, the existing power supply lines have been severely overloaded and must be retrofitted. The first problem to be solved is that it is more appropriate for the capacity of residential power transformers to be chosen more. Choosing a larger one results in an increase in line investment. If it is smaller, the power distribution equipment is overloaded, affecting the safety of electricity consumption. To this end, we understand the families of workers, after thorough investigation, each generally have the following home