Through the analysis of three phase prepayment control box use condition in Xiangfan district, the problems which are possible appearing during its operating process were pointed out.
通过对襄樊地区三相预付费控制柜使用情况的分析，指出控制柜运行过程中可能出现的问题，提出控制柜的改进意见。
Under the proper simplified condition, the calculation formulas of rectification voltage and phase current were deduced out respectively and were testified by experiment.
在适当的简化条件下，推导出各自整流电压和相电流的计算公式，并通过了试验验证。
If we introduce the ladder-shaped circuit simple in good time, the oscillating frequency and oscillating condition of rc phase shift oscillating can be worked out easily.
如果能适时地引入梯形电路的简单介绍，则rc移相式振荡电路的振荡频率及振荡条件可以容易地求出。
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