发电机-变压器单元新的运行方式下可采用无载调压变压器

No-load voltage regulating transformer — an alternative for generator-transformer unit in new operating mode

最近几年 ,发电厂出现了一种新的运行方式 ,即在发电机出口装设断路器 ,用主变压器从系统倒送电作为厂用电的起动电源。为保证厂用电的稳定 ,主变压器一般要采用有载调压变压器 ,以便于电压调整 ,但同时也增加了变压器的投资 ,且易出故障。主变压器是否一定要采用有载调压呢 ?以广东省云浮发电厂 (B厂 )为例 ,通过实际计算 ,得出结论 :当发电机出口装有断路器时 。

In recent years, there appears a new operating mode in power plants, i e ,apply GCB (generator circuit breaker) and use the power inversely supplied by the main transformer as the auxiliary start up power source. To guarantee the stability of auxiliary power, the on load voltage regulating transformer is usually used for the main transformer to facilitate voltage regulation, which, however, increases the transformer costs and is susceptible to failure. In this paper, the authoress takes Yunfu Power Plant (B) as an example, and draws a conclusion via calculation that the no load voltage regulating transformer is also an alternative for the main transformer.