Phase-shifting transformers help control the real power flow in transmission lines and systems interties. It is beneficial to use phase-shifting transformers in the protection of lines and transformers.

Phase shifting transformers is used for protection from thermal overload and to improve transmission system stability.

Phase shifting transformers enables you to control the power flow between different networks, for parallel long distance overhead-lines or for parallel cables.

Phase-shifting transformer is very often the most economic approach to power flow management

This is a collection of tutorials and PDF links about phase shifting transformers. Below are sites and links that discusses Phase Shifting Transformers.

Phase-Shifting Transformers
Phase-shifting transformers (PST) are used to control the flow of real power in transmission lines by manipulating the phase angle difference. The phase angle shift is obtained by combining the voltages from different phases in the PST. Phase-shifting transformers, when combined with standard capacitors and reactors, can even provide control of reactive power and fault current limitation. Read more...

Phase Shifting Transformers: Principles and Applications
The purpose of this paper is to give a short overview of existing technologies regarding phase shifting transformers (PST’s). A classification is made based on the symmetrical or asymmetrical and on the direct or indirect character of the PST. As a case-study, the PST’s in Meeden, The Netherlands are studied more profoundly. Furthermore, a model is developed on a real-time digital simulator (RTDS) in order to demonstrate the capabilities of the PST. Read more...

Power Flow Control By Use of Phase Shifting Transformer
The operation efficiency of electric transmission system can be increased using of appropriate tools for the control of electric powers flowing along the power lines. Phase - shifting transformers (PST’s) rank among such tools. The purpose of this paper is to provide basic information about these transformers. The paper explains the function of PST and the meaning of PST application in electric transmission system. The influence of PST on power distribution is described using the model created in Matlab software. Read more...

Current-Transformer Phase-Shift Compensation and Calibration
This application report demonstrates a digital technique to compensate and calibrate the phase shift of a current (or voltage) transformer used in electric power or energy measurement. Traditional analog compensation is replaced by a digital finite impulse response (FIR) filter. A technique emulating a non-unity power factor (non-UPF) load makes the calibration fully automatic. The calibration time is greatly reduced and it is more accurate and consistent. Use of emulation removes the bulky expensive non-UPF load. Read more...

Protecting a 138 kV Phase Shifting Transformer: EMTP Modeling and Model Power System Testing
This paper describes the protection of a 138 kV, 300 MVA Phase Shifting Transformer (PST) installation, and the issues associated with differential protection stability during external faults that cause PST series winding saturation. In addition, this paper discusses PST modeling using the Electromagnetic Transients Program (EMTP). EMTP modeling is necessary for these complex devices, to verify the protective relaying settings for the particular application and their applicability to different fault scenarios and operating conditions. For the case study detailed in this paper, we verified the relay settings by playing the EMTP transient data back into the protective relays using an open loop approach. Read more...

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