Abstract
This paper focuses on the effect of transformer parameters and a line reactor on distribution of power flows in a high-voltage substation and transmission lines. Four case studies that have different values of transformer parameters including rated power, short-circuit impedance and reactance/resistance ratio are supposed in this research. Basing on power flows on transformers in case of the parallel operation, load factor of each transformer and operating parameters are considered in above case studies. Moreover, a line reactor is proposed in this paper to regulate power flows in a system having two power sources. Four operating modes of the proposed line reactor are defined by changing on/off states of switches in this device to modify the value of impedance. The effect of the line reactor on power received from sources and power flows on transmission lines is evaluated in its all modes. Research results are carried out by the ETAP 16.0 software and present high accuracy and reliability for the proposed problems. Research contributions help dispatchers understand the essence of power transmission process, solve real problems and give out effective solutions to operate high-voltage systems.
Highlights
Transmission systems are composed by power lines and substations, where power substations have some transformers
This paper proposed to implement a line reactor on a highvoltage transmission line to limit the current when switching source process
The new contribution is the evaluation of reactance of the line reactor on power flows mobilizing from source in real operating process
Summary
Transmission systems are composed by power lines and substations, where power substations have some transformers. There are some differences of transformer parameters because of activating on-load tap changer or replacing one of transformers when having any faults related to transformers [4, 5] They lead to the difference of power flows on transformers and affect to the reliability of relaying protection. Line reactors that have low cost and can help to limit switched current were proposed to in medium voltage grids [10,11,12,13,14]. They can be applied to insert a reactance to a line that can change voltage angle. They have some difference between rated power, Z% and X/R ratio
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