Research on Minimum Approach Distance for Live Working on 1000kV Ultra High Voltage AC Transmission Line

2009 ◽  
Author(s):  
Linong Wang ◽  
Kai Liu ◽  
Guiwei Shao ◽  
Ting Liu
Keyword(s):  
Transmission Line ◽  
High Voltage ◽  
Approach Distance ◽  
Ac Transmission ◽  
Ultra High Voltage

Properties of Porcelain Suspension Insulator for Ultra High Voltage Transmission Line

2003 ◽  
Vol 36 (20) ◽  
pp. 873-876
Author(s):  
In-Hyuk Choi ◽  
Jang-Hyun Choi ◽  
Dong-Il Lee ◽  
Gil-Jo Jung ◽  
Yeon-Gye Choi
Keyword(s):  
Transmission Line ◽  
High Voltage ◽  
High Voltage Transmission Line ◽  
Suspension Insulator ◽  
High Voltage Transmission ◽  
Ultra High Voltage

scholarly journals Analysis of Relay Protection System Comparison for Better Identification of Faults in High Voltage AC Transmission Lines

2021 ◽  
Author(s):  
Rimsha Fazal ◽  
Arooj Aslam ◽  
Habib Ullah Manzoor ◽  
Tareq Manzoor
Keyword(s):  
Transmission Line ◽  
High Voltage ◽  
Transmission Lines ◽  
Circuit Breaker ◽  
Operating Time ◽  
Protection System ◽  
Ground Fault ◽  
Double Phase ◽  
Overcurrent Relay ◽  
Ac Transmission

Abstract A high voltage protection system is designed to protect the system against the hazards like instant high voltage condition like lightening voltage in the rain, power variation in the transmission lines etc. In these conditions, our system may face a voltage twice and thrice greater than its original nominal ratings. In this paper, performance of four different relays (overcurrent relay, over and under voltage relay, distance relay and differential relay) have been calculated based on operating time in 400KV high voltage AC transmission line of 80-250km under different faults, modeled on MATLAB for the identification of different types of faults in a transmission line. These relays can differentiate between the normal operating condition and fault conditions. In this paper simulation comparison of these four relays is presented by comparing their operating time in Single line to ground fault (LG), three phase fault (LLLG) and Double phase to ground fault (LLG). The output waveforms are observed under the normal condition or no-fault condition and in the fault condition and response time is calculated to operate a circuit breaker.

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