XC-2100E Travelling Wave Fault Location System
Transmission systems are at the heart of the power network and their availability is essential to the reliability of the system. When a fault does occur, it can be difficult to locate, particularly on long remote lines. Conventional fault locators work on the principle of measuring the impedance of the loop through which the fault current flows. In most cases, this includes a return path through the ground for which knowledge of the actual impedance is hard to obtain and is often estimated, leading to inaccuracies in the measurement of the distance to the fault. By utilising travelling waves, created when the fault occurs, the XC-2100E can measure the fault position independently of impedance and identify the fault point much more accurately.
The system provides accurate fault location solution for all transmission and distribution power lines, with each unit monitoring up to 8 lines. The fault distance measurement error is less than ±150m and is independent of line length and other factors which affect the fault location accuracy of traditional impedance measurement methods, including; line and earth return loop impedance, instrument transformer accuracy and uncertainty of zero sequence impedance due to variance of soil resistivity along the line corridor.
The use of travelling waves as the basis of the distance measurement, makes the XC-2100E system particularly suitable for cable systems. These can be underground cables, hybrid systems involving overhead transmission and cables, or underwater cables.
The XC-2100E consists of the travelling wave data acquisition unit XC-100E installed at the substation and the master station which analyses the data using software XCF-2100E. For accurate timing for the devices involved, the XC-2100E uses an internal GPS time synchronization module to provide an accurate time reference.The fault location can be mapped on to a Google Maps plot of the transmission line.