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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