Fuzzy Adaptive Transmission-Line Differential Relay Immune to CT Saturation

Ever-increasing consumption of electrical energy has forced extension of power networks to large areas. This would raise reliability and stability problems of power networks. Hence, there is a serious need to work on protection arrangements and relays behavior for solving these problems. By suitable configuration of protection systems and using correct protection functions, negative effects of undesirable faults in power system will be decreased. In this paper, an algorithm is proposed to enhance the performance of differential relays based on the fuzzy logic systems. The algorithm is employed for the protection of short transmission lines against internal faults with/without resistance. By selecting the best stability characteristics based on fuzzy logic systems, the possibility of protection relays' malfunction will be negligible. In this algorithm, sensitivity, reliability and speed of the relay performance are preserved at suitable levels. Considerable external faults which can saturate current transformers (CTs) have been taken to account in this algorithm. This study purpose is to present an algorithm based on the fuzzy logic, which can select the best slopes for stability characteristics of a differential relay during various conditions. The presented algorithm performance has been analyzed by PSCAD/EMTDC software and compared to conventional methods. The results of fuzzy adaptive protection performance testing prove that the proposed algorithm remains fully immune to current transformer saturation during external faults. The other advantage of this algorithm bases on the fact that the scheme does not need to detect CT saturation, it processes the proposed criteria signals independently of the situation.

show abstract

“…IbiasL isline bias current. φ is the criterion angel and K1g and K2p are variables of the proposed algorithm [21,22].…”

Section: The Proposed Algorithmmentioning

confidence: 99%

A Novel Fuzzy Theory-Based Differential Protection Scheme for Transmission Lines

Abasi

Farsani

Rohani³

et al. 2020

IJIE

View full text Add to dashboard Cite

show abstract

“…Krzysztof Solak [16] et al suggested fuzzy adaptive relaying scheme immune to CT saturation for avoiding maloperation of relaying scheme. However real hardware based implementation is complicated issue.…”

Section: Introductionmentioning

confidence: 99%

Performance Metrics of Grid Connected Solar PV Power Plant � A Practical Case Study

Kumar¹,

Raju²,

Kar³

et al. 2017

JGE

View full text Add to dashboard Cite

During out of zone fault, Current Transformer (CT) saturation leads maloperation in unit type protective schemes. Detection and classification of saturation condition of CT is still a challenging issue. Thus, it is most important to correctly categorize CT saturation condition to increase reliability and stability of protective schemes. The proposed scheme utilizes transmission line CT secondary post fault current signals (sliding window) as an input to SVM. In order to achieve the most optimized classifier, Gaussian Radial Basis Function (RBF) has been used for training of SVM. Feasibility of the proposed scheme has been tested by modelling a part of 220 kV power systems in PSCAD/EMTDC software package. The algorithm is executed in MATLAB software. More than 720 unsaturated and 3600 saturated cases with varying burden resistance, remnant flux, DC component of current, noise penetration to current signal and fault inception angle have been generated and used for validation of the proposed scheme. The proposed scheme effectively discriminates between CT saturated and unsaturated conditions with very high classification accuracy more than 99% for different parameter variations.

show abstract

“…The failure occurring in distribution system and affecting to the end user system must be detected and rejected from the system. Nowadays, the characteristics of power system have been studied using simulation program [1][2][3][4][5][6] or mathematical model [7][8]. By considering the literature review about simulation program, this research studies the fault location in transmission line of 3-phase multi-generator system in conjunction with an adaptive neuro-fuzzy inference system (ANFIS) and artificial neural network (ANN) [1].…”

Section: Introductionmentioning

confidence: 99%

“…In [5], by simulation using EMTP-ATP model, the saturation of transformer can cause the fault in transmission line. In [6], by simulation using PSCAD/EMTDC program, this research proposed techniques to distinguish the transient origine among the faults, the normal switching, and the capacitor bank switching [6]. By considering the literature review about mathematical model, fuzzy and neural network are interesting to study the path characteristic frequency-based fault for locating single line to ground fault in radial distribution systems.…”

Section: Introductionmentioning

confidence: 99%

Study of Characteristics of Fault in Overhead and Underground Cable Distribution System Using Experimental Test Bench

Yindeesap

Ngaopitakkul

Leelajindakrairerk

2015

Proceedings of the 3rd International Conference on Intelligent Systems and Image Processing 2015

View full text Add to dashboard Cite

This paper is focused on the behavior of current waveform when the single line to ground fault occurs on the pilumped equivalent circuit experimental test bench of distribution system. The experimental test bench can be divided into the distribution system either overhead line or underground cable. The parameter of experimental test bench is calculated based on per-unit method by using the data from the 115 kV distribution system in Thailand. The various case studies are performed by changing the type of distribution system, the location of fault, the inception angle of fault including varying the load. The obtained results show that, during the fault occurrence, the current waveform has a sudden change and increases more than 10 times in comparison with normal condition. Finally, the results from the experimental test bench will be beneficial in the behavioral study of the fault current in case of both overhead line and underground cable and will be development of the short-circuit protection system in the distribution system.

show abstract

Fuzzy Adaptive Transmission-Line Differential Relay Immune to CT Saturation

Cited by 20 publications

References 7 publications

A Novel Fuzzy Theory-Based Differential Protection Scheme for Transmission Lines

A Novel Fuzzy Theory-Based Differential Protection Scheme for Transmission Lines

Performance Metrics of Grid Connected Solar PV Power Plant � A Practical Case Study

Study of Characteristics of Fault in Overhead and Underground Cable Distribution System Using Experimental Test Bench

Contact Info

Product

Resources

About