Power System Protection, fault location, distributed generation
11 Followers
Recent papers in Power System Protection, fault location, distributed generation
This paper describes an adaptive distance relaying scheme which can eliminate the effect of fault resistance on distance relay zone reach. Distance relay is commonly used as main protection to protect transmission line from any type of... more
This paper describes an adaptive distance relaying scheme which can eliminate the effect of fault resistance on distance relay zone reach. Distance relay is commonly used as main protection to protect transmission line from any type of fault. For a stand-alone distance relay, fault resistance can make Mho type distance relay to be under reached and thus the fault will be isolated at a longer time. In this scheme, the relay detects the fault location using a two-terminal algorithm. By knowing fault location, fault voltage at the fault point can be calculated by using equivalent sequence network connection as seen from local terminal. Then, fault resistance is calculated by using simple equation considering contribution from remote terminal current. Finally, the compensation of fault resistance is done onto
calculated apparent resistance as seen at relaying point. The
modeling and simulation was carried out using Matlab/Simulink software. Several cases were carried out and the results show the validity of the scheme.
calculated apparent resistance as seen at relaying point. The
modeling and simulation was carried out using Matlab/Simulink software. Several cases were carried out and the results show the validity of the scheme.
Faults can occurred at the transmission line due to lightning strike, broken conductor, cross arm or tower falls, danger tree, crane or animal encroachment, polluted insulator etc. Each type of fault will represents a fault resistance... more
Faults can occurred at the transmission line due to lightning strike, broken conductor, cross arm or tower falls, danger tree, crane or animal encroachment, polluted insulator etc. Each type of fault will represents a fault resistance value. Fault resistance will affects the accuracy of protection relays in fault location and fault zone detection. Phase to phase fault is one type of unsymmetrical fault at the transmission line. This paper represents the accurate way to calculate the actual phase to phase fault resistance value by using data from both local and remote substations. From the finding, the actual fault resistance can be represented by fault resistance as seen from local substation in parallel with the fault resistance as seen from remote substation. To prove the finding, simulation has been carried out and the results show the validity of the proposed theory.
This paper presents an approach to estimate fault using the both ends data of the faulted circuit. It uses the negative sequence voltages magnitude. Now-a-days a keen interest has been developed on impedance measurements which depends on... more
This paper presents an approach to estimate fault using the both ends data of the faulted circuit. It uses the negative sequence voltages magnitude. Now-a-days a keen interest has been developed on impedance measurements which depends on fundamental frequency currents and voltages. A two-ended fault location method is used to estimate the accuracy of fault distance measurements significantly by using data from the two ends of the line to cancel the effect of fault resistance. Negative sequence circuit is considered in double-circuit transmission line as there is no mutual coupling between the negative sequence components of two circuits. The main objective of locating unsynchronized faults on double-circuit transmission line needs only the voltage data at both ends of the lines to estimate the fault location. As, it locates the unsymmetrical faults, it is independent of fault resistance and fault type. Fault classification is not required to estimate fault location. Estimation of fault is tested for different cases based on unsynchronized measurements, which depends on fault type and fault resistance. Unsynchronized techniques are analysed to study the three-terminal lines.
Related Topics