الفهرس 
introductionOnly 14 pages are availabe for public view
 |  | from | 135 |  |  |
| | | from | 135 | | |
Abstract
As a consecuence of the growing demand on electrical power and the continuous development, the power transmission networks have become more complicated. The protection schemes which are dedicated to protect the transmission line TL in the past have become inapplicable now after the continuous line tapping with sources of generation and/or loads. Among several issues of power systems, three different issues are addressed in this thesis. The first issue is related to determine the fault location on three-terminal TLs which are known as multi-terminal lines. The second issue concerns the influence of various factors on fault locator accuracy. The third issue is to determine the fault type and properly activate the operation of single-pole circuit breaker tripping. In this thesis, the uses of the phasor measurement unit PMU are introduced to enhance the power system performance. The synchrophasor technology based on PMU is employed to overcome the aforementioned issue typically, the fault locator FL algorithms that used for simple two-terminal TL configuration cannot be directly applied on multi-terminal TLs. Several FL algorithms based on PMUs are reviewed. Among the most common approaches two distinctive FL concepts novosel and jiang are detailed in this thesis. Also the selected algorthms are experienced under different fault conditions, path resistances and sampling rates. A jiang based FL is presented to get the fault location in 3-terminal 3- phase PSCAD/EMTDC program and the data mining are performed in MATLAB environment. The simulation results show that there are several factors affecting the FL accuracy, such as PMU sampling rate, communication and synchronization means. The impact of these factors is considered. Stability studies show that there are improvement in system stability and power current magnitudes based fault classifier and fault-phase selection scheme are proposed. THE proposed classifier and phase selection scheme are examined under different fault conditions type, location, path resistances and PMU sampling rates. At the end of this thesis the accuracy of the jiang’s FL algorithm is experimentally evaluated using a TL model and two PMUs equipped with global positioning system GPS signal in the power system lab., faculty of industrial education. The SEL-351A and a phasor data concentrator PDC SEL-3373.