International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 03 | Mar 2025
p-ISSN: 2395-0072
www.irjet.net
Parallel transmission lines protection using creative Cos-Sin protection Dina Mourad1, Ali Mohammed EL ghazaly2, Mostafa Safwat Alqayaty3 (1)
Faculty of Engineering, Pine Sattam university, Elkharg, Saudi Arabia.
(2)
Faculty of Technology and Education, Helwan University, Cairo, Egypt. (3)
Faculty of Engineering, Helwan University, Cairo, Egypt. -------------------------------------------------------------------------***-----------------------------------------------------------------------technologies cause dangerous stability problems such as 1 - Abstract
cascading failures, isolation of interconnected subsystems, and large-scale power outages [3].
This research addresses the critical challenges in protecting double-circuit transmission lines through an innovative approach utilizing a Cos-Sin function methodology, operating independently of communication channels. The proposed design represents a significant advancement in addressing conventional protection limitations
Protection relays used in parallel lines are more complex than those used in a single transmission line due to the mutual coupling between the dual circuits and the initial conditions for faults [4]. Transmission path protection measures include those that use communication channels and those that do not use communication channels. The reliability of communication links influences the reliability of communication-based protection [5].
2 - Introduction To overcome such drawbacks, this article introduces an innovative Cos-Sin function to protect double-circuit transmission lines without communication channels. The proposed design extracts a set of information from a creative Cos-Sin variational relay signal. This information is the size and polarity of the innovative Cos-Sin changing relay signal. In the proposed design, we measured the current signal only at the relay position. Apply a simple formula to combine threephase power signals into one to reduce computational burden. In this study, we use ATP software to generate failure cases and MATLAB to implement the proposed design. Furthermore, this paper validates the simplicity of the experimental implementation of the proposed Cos-Sin variation for signal propagation using physical data. The software used to record physical data is his LABVIEW software. This paper also compares the proposed method with conventional methods and new existing methods. The results show that the proposed design is successful in overcoming these difficulties and its experimental setup is simple. Furthermore, this article documents the success of the proposed method under various transmission line lengths and system voltages. The results show that the proposed design is sensitive, selective, safe, reliable and dependable for the protection of dual-circuit transmission lines.
Many recent research papers have proposed various protection schemes for parallel transmission lines. Longitudinal differential protection is now widely used in parallel ultra-high voltage transmission lines. However, this depends on the communication channel and is subject to capacity. Directional comparison pilot protection also depends on the communication channel, and mutual zero inductance affects the communication channel [2]. As a result, communication-based relays are typically costly and require high-accuracy synchronization between the two final measurements [6]. Current mutual differential protection is independent of the communication channel. However, if an abnormality occurs in the transmission line connection, it cannot be detected by remote side protection. The range of consecutive operating zones depends on the system conditions and is affected by the equivalent power supply resistance [2]. Cross differential relays only require information from one terminal. However, it is not possible to distinguish between the transient components that occur in the case of a fault and those that occur due to the opening of a circuit breaker [3].
Power systems have widely installed parallel transmission lines due to their advantages of increasing power system capacity and reliability and reducing construction costs [1] [2] . Therefore, it is important to consider parallel transmission line protection. The transmission line plays an important role, and errors in the transmission line account for about 50% of the total errors [2] [1]. Moreover, malfunctions of its protection
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There are two ways to resolve this issue. The first method involves impedance-based relays, but because they require a voltage signal, they are subject to the transient response of transformers with coupling capacitors. The second method is the analysis of traveling waves induced by far-end circuit breaker opening-based relays [7].
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