A phase-shifting transformer is a device for controlling the power flow through specific lines in a complex power transmission network. The basic function of a phase-shifting transformer is to change the effective phase displacement between the input voltage and the output voltage of a transmission line, thus controlling the amount of active power that can flow in the line.
In an increasingly complex power-generation landscape and a growing energy market, the capability to control the flow of power is fast gaining in crucial importance. This is the area, where phase-shifting transformers (PST) excel.
Grid operators use this capability to increase the transmission capacity of the network, while minimizing expensive grid expansions. These transformers protect lines, make grids more reliable, and reduce transmission losses. And they are among the most economic and cost-efficient solutions for power-flow management out there.
Phase Shifting Transformers can be Single-Core or Two-Core, Single tank or Two tank, Symmetrical or Non-symmetrical, 90Â° regulation or 60Â° regulation design, based on different parameters.
The most common types are: Two-core design in symmetric or asymmetric configuration and Single-core design in symmetric or asymmetric configuration. Both of them allow a possible addition of an in-phase voltage regulation, to compensate the net voltage fluctuation or to combine in-phase and quadrature regulation.
Phase-shifting transformers are highly complex units. To meet the unique needs of each specific customer, phase shifters are often custom-designed and manufactured to specification.
Market segmentation of Global Phase shifting transformer has been done on the basis of-
Based on the power rating of the transformers, phase shifting transformers can be classified as-
Depending on the rating, single core or two core designs are used.
The advantage of the single-core design is simplicity and economy. This can be further classified as symmetrical and unsymmetrical PST.
For smaller ratings and lower voltages, two-core PSTs can be built into a single tank, while larger ratings and higher-voltage PSTs require a two-tank design. The advantage of a two-core design is the flexibility in selecting the step voltage and the current of the regulating winding.
ABB’s High-performance phase-shifting transformers to better control integrating of offshore wind power into the electricity grid / Potential to offer savings of more than $110 million over 3 years for Germany.
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