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In power grids, phase-shifting transformers provide active power flow control. By enforcing or blocking loads, they not only improve the stability and flexibility of grids but also help grid operators get the most out of existing hardware.
Ratings: ≤ 1.200 MVA ≤ 765 kV
Features: Compact design; low noise; high phase-shift capability
Options: Ester insulation; low noise, etc.
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. They 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.
In a grid struggling with unwanted power flows from adjacent networks – for example, due to the hard-to-control feed-in from renewable power plants – phase shifters protect from additional loads. By changing the effective phase displacement between the input voltage and the output voltage of a transmission line as needed, phase shifters enforce, block and even revert power flow as well as reduce or eliminate loop flows. Phase shifters can rebalance line loading between parallel lines or network sections.
Grid operators use this capability to increase the transmission capacity of the network, while minimizing expensive grid expansions. A decisive step toward ensuring the stability and reliability of your own grid and enabling strategic energy planning.
The fast-transforming energy landscape of heterogeneous power grids presents operators with similarly fast emerging challenges. Their capability to ensure grid stability and reliability – and actively balance in shifting amounts of power from renewable energies – make these transformers a versatile must-have for competitive grids.
Siemens' sustained experience in phase-shifter design and rigid dedication to quality not only ensure smooth and on-time project execution. More importantly, they ensure that customers enjoy the full benefits of reliable performance over the long service life of their custom-designed unit. However, there are more advantage to relying on Siemens for a phase-shifting transformer:
As the most cost-efficient solution for power flow control, phase-shifting transformers contribute to the financial success of grid operators in a competitive energy environment. With their trademark reliability and efficiency, Siemens' tailored-to-fit phase shifters come with a wide range of competitive advantages. But what really makes Siemens transformers stand out is the extensive in-depth design and spec support.
Creating a perfect fit for your grid
Once specifications have been set, a tender can only achieve so much in ensuring a cost-efficient result. Therefore, Siemens offers customers a collaborative and iterative approach to defining specifications. The experts of Siemens Power Technologies International (PTI) share their insights into which combinations of specifications drive cost and performance, while the customer’s network planners have a clear picture of the required capabilities their new transformer.
This Siemens approach combines their expertise to give customers a perfectly tailored transformer – the most cost-efficient and robust solution to the performance they need.
How Siemens‘ phase-shifting transformers benefit operators
At the company level, by
In their business performance, by
During operation, by
* Depends on ratio of impedances-line resistances
With Power Technologies International (PTI), Siemens has established a service that goes beyond finetuning customer requirements. Its subject-matter specialists run grid studies that go toward building a comprehensive profile to answer the key question: What capabilities does the phase shifter need to solve the customer’s pain points?
Transcending the specs
This holistic approach ensures that a customer’s specific needs and situation inform all decisions, from the very first project stage to the energization on site. PTI’s unique perspective produces phase shifters, which not only are built to specs, but come with greater flexibility in addressing the customer’s challenges.
Customers benefit from…
Siemens Transformers rigorously vets its suppliers. Selected partners comply with the Siemens supply-chain standards, emphasizing total cost, commitment to quality, and environmental awareness.
Siemens' dedication to quality ensures...
1Failure rate only available for AC transformers in total
Our power system consulting services range from power system studies and field measurements to disturbance investigations.
Siemens transformers are well-known for their superior first-pass yield. They undergo rigorous testing at Siemens own test facilities before they are shipped to the customer. This approach – along with Siemens signature precision in manufacturing – ensures compliance with guarantee values and a successful operation in the field.
Enough space to test fully-assembled units
Siemens test bays are uncommonly spacious. Why? To ensure reliable performance in their target environment, Siemens engineers rigorously test fully-assembled units in their test bays – even towering giants, such as dual-tank phase shifters.
Since its very beginning, Siemens has worked closely with customers to push the limits of transformer technologies. Their shared goal? To maximize the product value for each specific use case. Milestones range from redefining limits, such as voltage level or maximum phase shift, to finding Siemens answers to global challenges our customers face – answers, which include compact low-noise units for urban areas as well as the first phase shifter with an environmentally-friendly ester insulation.
Phase-shifting transformers are highly complex units. To meet the unique needs of each customer, Siemens phase shifters are custom-designed and manufactured to specification.
We organize webinars and other events to give grid operators an opportunity to ask specific questions about phase-shifters. Here are examples from our latest Q&A session.
Standard substation transformer tap changers are used in phase shifters, as well. However, the designer has to consider the overexcitation in retard operation, that is to say, the increased voltage across RW. According to the established standard, a tap changer must be able to switch 2x the rated current. Overexcitation often necessitates limiting the overload. You can use a standard TAPCON controller.
Currently, there is no thyristor tap changer for large power transformers. The standard for a switch is appr. 5.4 sec/tapWith fast-switiching gear the value drops to 2.7sec/tap.
You will need studies on Load Flow, Short Circuit, Dynamic, and Switching Transient & Protection. You may also require more specialized studies for any number of reasons, such as the particular region, in which you are located. For example, if the lines in the region are not transposed, you will need to conduct an Unbalanced Load Flow Study. Other studies may focus on the impact on harmonic power flow or subsynchronous oscillations.
400kV, yes, but we have not yet seen a 765/765kV PST. However, there are 765/400kV auto transformers with a perpendicular voltage component to the common neutral.
For your convenience, we have gathered relevant downloads in one spot. If your question is still unanswered, please feel free to contact our Energy Support Team.
Siemens phase shifters are built for operations and environments all over the world. They not only meet highest customer requirements, but comply with both national and international standards.
Explore how to best approach the specifications for your phase-shifting transformer.