The bulk transfer of power is mostly a passive affair, where the power flows to the load by the lowest impedance path. To influence this flow, the phase angle of the sending or receiving end must be modified – this may be done by the use of Phase Shifting Transformers. The phase shifting transformer introduces a circulating current into the system which acts to either reduce (when operating in buck mode) or increase (when operating in boost mode) the load current in the line where the phase shifting transformer is located.
The actual phase shift is achieved by the interconnection of two phases of the star-connected regulating windings across one phase of the delta connected “booster” winding. By on-load tap changing, the magnitude and polarity of the phase shift can be modified, which in turn determines the circulating current in the system. For lower power ratings the two active parts may be placed in a single tank.
However, in higher power phase shifting transformers, the two active parts (the exciter and booster transformers) are mounted in separate tanks and the two active parts are connected together. This connection between the exciter and booster transformers is done at full system voltage and must normally be done inside oil-filled trunking, to guard against the risk of a damaging internal short circuit occurring.
SGB-SMIT Group has excellent experience of large phase shifting transformers, including the capability to analyse the complex transient voltages that may occur during external switching or lightning events.
Royal SMIT Transformers B.V. has an ongoing engineering evaluation process for continuous improvement and upgrade of its design programs.
Royal SMIT engineering is making full use of a high end 3D-CAD system for the complete transformer design. Active parts and tanks can be combined in one model allowing the best possible check on correct dimensioning.
Almost all engineers use 3D-CAD stations. The introduction of 3D-CAD technology was thoroughly prepared over the past years. A team of experts worked fulltime on the required tank- and active part models.
The great advantages for SMIT as well as its customers are:
Royal SMIT Transformers B.V. produces large power transformers with independent clamping of the core and windings. This clamping system is unique amongst manufacturers of large power transformers.
The independent clamping arrangement has many advantages:
Royal SMIT style windings differ from most of our competitors in having axial cooling ducts without pressboard radial spacers. This type of winding style has several advantages:
Royal SMIT Transformers B.V. has developed finite element models of the transformer tank design allowing the tank stresses and vibration levels to be accurately predicted:
Reliable Transformers with the unique single winding clamping construction are shipped wordwide to customers producing power. We have extensive experience with requirements for the nuclear industry and the renewable energy. The single winding clamping construction gives additional strength regarding short circuits and does not influence the core clamping.
Large Power Transformers have been delivered for customers choosing for Transformers with a long life span, high reliability and with the approved unique single winding clamping construction.
Reliable energy supply in all production processes is of main importance for our customers. Reliable Transformers are part of this philosophy. Our Transformers have been delivered all over the world for multiple industries chosing for quality and reliability.
Short Circuit Resistance is a major concern for customers within the railway industry. That is why our Transformers are chosen, being very reliable due to the unique single winding clamping construction and the high quality of our Transformers.
