Abstract
This paper presents an application of a certain distance protection relay with a quadrilateral characteristic approach for the protection of the 110kV Duy Xuyen - Thang Binh transmission line in Vietnam using measured data from one terminal line. We propose the building process of a Matlab Simulink model for this relay that combines fault detection and classification block, apparent impedance calculation block for all types of faults and a trip logic block of three zone protection coordination. The proposed relay model is further tested using various fault scenarios on the transmission line. It is important to assess what happened, the actual conditions, the causes of mal-operation etc. Detailed explanation and results indicate that the proposed model behavior will help users to perform tests which correctly simulate real-world conditions besides that it properly interprets test results and troubleshoot distance function problems when results are not as expected.
Highlights
Transmission lines are one of the main components in high voltage and extra high voltage power system
In order to prove this issue, the current paper focuses on the algorithm of Siemens 7SA522 relay that uses a quadrilateral characteristic
Thereafter, the 110kV Duy Xuyen Thang Binh transmission line model is selected as an example of fault simulation and the algorithm relay is tested in Simulink
Summary
Transmission lines are one of the main components in high voltage and extra high voltage power system. There are various distance relays that have been implemented by different vendors These relays help to protect safeguard transmission line from exposure to any type of faults (internal or external) which could intentionally or inadvertently damage electrical equipment and avoid a great effect on the stability of the entire power system. The distance protection faces a number of factors which influence negatively its operation, and affect its accurate determination of the measured impedance. This results in inaccurate fault location determination [1]. Conclusions based on the results are discussed along with the resistance fault factor affecting the relay’s accuracy
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