Delta x, delta y and delta z are actual numbers, and this becomes a number. △x,△y△z,都是实实在在的数量,这当然也是数量了。
And this is a placeholder for small variations, delta x, delta y and delta z to get an approximation formula. 这也是微小变化的占位符,由△x,△y,△z得到近似式。
Influence of Add-assist Circulation Current at Delta Side on Y / Delta Transformer Differential Protection 变压器三角形侧零序环流助增对差动保护的影响
The Y connection and delta connection of transformer in DVR is simulated with Matlab and the three-phase four-wire structure with Y connection is used in the experiment, which can compensate zero voltage component of source voltage by approved SVPWM algorithm. 分别对变压器不同的连接方法进行了Matlab系统仿真,并对变压器星形连接的三相四线结构和改进的SVPWM控制方法作了实验,解决了系统中存在电压零序分量问题。
Distribution voltage class capacitor banks can be connected in grounded wyes, ungrounded wyes or delta. triangular finishing pass 配电电压等级的电容器组可接成接地Y形、不接地Y型或△。(Y形轧机的)三角精轧孔型