The three - phase to four - phase transformer with a four - phase four - leg structure solves the problem . the windings on each leg of this transformer are not more than three 这种变压器每相铁心柱上的绕组不超过三个,是不等相变换的最简单形式。
Principally , when the winding - connection scheme is adopted to add a set of auxiliary windings on the two - phase side of a balance transformer , we can get a three - phase to four - phase transformer 原则上,在平衡变压器的两相侧采用增加一套副绕组的双重接线方案,便可得到三相变四相电力变压器。
When the phase is changed , the used phase transformers is voltage - control phase transformer which is changed by phase transformer consist of ordinary operation amplifier consist of ordinary operational amplifier 在相位调整时所运用的移相器是由普通运算发大器构成的移相器改造成的压控移相器。
The paper brings out a few of measures to save energy including rational planning of grid , improvement of line loss management , public line , reactive compensation on - spot , promotion of single - phase transformer and elimination of timeworn facilities , etc 提出了多种途径的节能措施,包括合理规划电网、加强线损管理、完善公用线路、公用台变无功就地补偿、推广单相变、淘汰落后用电设备等。
This paper presents a three - phase harmonic power flow algorithm using phase components and back - forward sweep method to solve the disconvergence when the three - phase transformer harmonic model was used . the example result presented the method was feasible and 本文针对在进行三相谐波潮流算法时因引入三相变压器谐波模型而可能导致计算结果不收敛问题,提出了谐波潮流计算的相分量法,其中引用了前推-回代法。
This kind of on - load tap changer has the merits of advanced structure , operating reliably , long useful life and maintenance freely , it is suitable for oil - immersed three - phases transformer with frequency 50hz , rated voltage 35kv and below and rated current under 400a and below 统一设计的有载分接开关,具有结构先进,动作可靠,使用寿命长,维护方便等优点,适用与50hz ,额定电压在35kv及以下,额定电流在400a及以下的三相油浸式变压器。
Though standard cast resin dry - type transformers can meet the demands of most consumers . we still have to proceed special designing of transformers for special application field and operating conditions , such as single phase transformers , regulating transformers with onload tap changer , double voltage transformers , isolating transformers , rectifying transformers , earthing transformers and transformers with special tapping arrangement , which we are supplying to consumers all over the country 虽然标准的树脂绝缘干式变压器已能满足大多数用户的要求,但是对于某些特殊的应用领域与使用条件仍需我们进行特殊设计。诸如单相有载调压双电压变换隔离整流接地以及有特殊出线排列的变压器,我公司在不断地提供给各地的用户。
When a smoothing function ' s first derivative is adopted as wavelet function , the local maxima of wavelet transform modulus detect the location of signal ' s singularities , in this thesis , these characters are not only applied to measure the magnitude of dead angles of the dissymmetry inrush but also the symmetry inrush in three - phase transformer 当小波函数取光滑函数的一阶导数时,信号小波变换的模在信号突变点将取得局部极大值。本文利用这些性质不仅对三相变压器的非对称性涌流间断角的大小进行测量,同时还测量了对称性涌流的间断角,测量精度有一定的改善。