The Laboratory Investigation of a Digital System for the Protection of Transmission Lines

Real‐time fault analysis of transmission lines using wavelet multi‐resolution analysis based frequency‐domain approach

“…There have been some attempts for transmission line fault analysis using physical models because such models are smaller, cheaper and simpler, yet capture most of the important aspects of physical system, which cannot be accommodated in numerical models. Breingan and Chen [16] have realised distance relay on a laboratory based sequence parameter model of a 72 mile transmission line. The fault in the transmission line model was detected by comparing the samples obtained from the present cycle of the current and voltage signal with the samples obtained from the previous cycle.…”

Fault classification on transmission line of 10kV rural power grid

“…The fault on transmission line of 10Kv rural power grid occurred easily because of the extremely badly environment. What worse,with the increasing of transmission line,the regional environment of line is more complex,so that,the difficulty of finding fault become harder and harder [1] .In 1980s,the fault classification techniques based on the variation of three phase voltage and current has been proposed [2] .Ten years later,the method of identify fault type using Neural Network or Fuzzy logic attracted many scholars , attention [3][4] .At the end of 1990s,the trend of power system signal analysis has been changed and the computional tools with the function of signal processing were widly used.The development in algorithm for detecting transmission line has made progress,meanwhile,promoted the development of transient technology [5] . The application of wavelet transform can make the operation of transient protection more effective [6] .…”

Fault Classification on Transmission Line of 10kV Rural Power Grid

“…The fault on transmission line of 10Kv rural power grid occurred easily because of the extremely badly environment. What worse,with the increasing of transmission line,the regional environment of line is more complex,so that,the difficulty of finding fault become harder and harder [1] .In 1980s,the fault classification techniques based on the variation of three phase voltage and current has been proposed [2] .Ten years later,the method of identify fault type using Neural Network or Fuzzy logic attracted many scholars , attention [3][4] .At the end of 1990s,the trend of power system signal analysis has been changed and the computional tools with the function of signal processing were widly used.The development in algorithm for detecting transmission line has made progress,meanwhile,promoted the development of transient technology [5] . The application of wavelet transform can make the operation of transient protection more effective [6] .…”