The diagnostic method of earth fault based on the evolution of fault in distribution network

2011 ◽  
Author(s):  
Jun Zhang ◽  
Bo Xu ◽  
Xu Cai ◽  
Li-jun Zhu
Keyword(s):  
Diagnostic Method ◽  
Distribution Network ◽  
Earth Fault

Protection Coordination of 33/11 kV Power Distribution Substation in Iraq

2021 ◽  
Vol 39 (5A) ◽  
pp. 723-737
Author(s):  
Yamur M. Obied ◽  
Thamir M. Abdul Wahhab
Keyword(s):  
Time Delay ◽  
Power System ◽  
Power Distribution ◽  
Software Package ◽  
Short Circuit ◽  
Distribution Network ◽  
Circuit Breaker ◽  
Short Circuit Current ◽  
Earth Fault ◽  
Current Characteristics

The coordination between protective devices is the process of determining the most appropriate timing of power interruption during abnormal conditions in the power system. The aim of this work is to coordinate the protection of the 33/11 kV power distribution substation in Iraq using the CYME 7.1 software package. In this paper overcurrent and earth fault relays are simulated in two cases, with time delay setting and instantaneous setting, to obtain the Time Current Characteristics (TCC) curves for each Circuit Breaker (CB) relay of Al-Karama substation (2×31.5 MVA, 33/11 kV) in Babil distribution network. The short circuit current at each CB is calculated and accordingly, the protection coordination for Al-Karama substation has been simulated. The TCC curves have been obtained in two cases for overcurrent and earth fault relays; in a case with time delay setting and in the case with the instantaneous setting. The setting takes into consideration the short circuit current at the furthest point of the longest outgoing feeder and the shortest outgoing feeder.

Study of Earth-Fault Location Method for Distribution Network Based on Transient Signal

2011 ◽  
Vol 105-107 ◽  
pp. 742-746
Author(s):  
Zhi Chao Huang ◽  
Yi Zhong ◽  
Cai Lin Li ◽  
Mu Liu ◽  
Sheng Zhen Yang
Keyword(s):  
Frequency Band ◽  
Fault Location ◽  
Characteristic Impedance ◽  
Distribution Network ◽  
Transient Current ◽  
Transient Signal ◽  
Location Method ◽  
Earth Fault ◽  
Current Energy ◽  
Feature Frequency

According to the generating process and propagation characteristics of earth-fault transient signal, an earth-fault location method for distribution network based on transient signal is presented. In the method, in order to change line characteristic impedance, a resonant filter circuit is paralleled in line segment border, so that it could cause transient current energy differences in feature frequency band on both sides of detection device. The location method achieves earth-fault area location through comparing transient current energy and energy attenuation coefficient in feature frequency band. The simulation test result shows that the method isn't influenced by distribution system grounded style, operation style and other factors and which could detect the earth-fault area rapidly and reliably in distribution network and has a high project application value.

scholarly journals Design of Automatic Detection Model for Single-phase Earth Fault in Distribution Network

1970 ◽  
Vol 1 (1) ◽  
Author(s):  
Yang Fan
Keyword(s):  
Fault Detection ◽  
Single Phase ◽  
Distribution Network ◽  
Automatic Detection ◽  
Input Vector ◽  
Detection Accuracy ◽  
Detection Model ◽  
Earth Fault ◽  
Ground Fault ◽  
Ground Fault Detection

The current distribution network single-phase ground fault detection model knowledge expression is poor, its production process only based on the normal distribution network sample data, no single-phase ground fault data, did not make full use of a prior knowledge, resulting in low detection accuracy. The automatic detection model of single-phase earth fault of new distribution network is proposed. The fault characteristic vector is taken as the input vector, and the degree of matching between the input vector and the weight vector element is introduced as the second layer. The fault vector is used as the input vector, and the fault vector is used as the input vector. Node input, the second layer of the output as the third layer of the input, the model training, the output of the results of the distribution network is a single-phase ground fault detection results. The experimental results show that the proposed model has high detection accuracy. 

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