Fast transfer test of power station auxiliaries
There has been much work done concerning the analytical and theoretical analysis of bus transfers, most of this pertaining to the induction motor during transients; however, very little has been published presenting experimental data of such a transfer. In this paper data is presented which was taken during and after a bus transfer on a 450 MW fossil fired unit. The data shows the validity of the models, but also indicates that the synchronous motor is more of a concern than previously thought.
Analytical Studies Of Voltage And Current Transients During Fast Bus Transfer In A.C. Auxiliary System Of Thermal Power Station
This paper presents a powerful approach to analyse the voltages and currents during auxiliary bus transfer. A generalized computer program using multi-motor modelling suitable for analysis of a number of motors connected on the unit bus has been developed. In the first part of the study, auxiliary bus voltage decay and phase angle, speed fall of various motors, motor residual voltage and current and bus frequency are investigated at discrete time interval of 0.001 second. In the second part of the study the in-rush currents in the individual motors at different instants of closing of the reserve bus are predicted. Also, the bus-voltage recovery characteristic i s obtained. A test case is also illustrated.
Frequency selective surface design for blinds applications
In this paper, the reconfigurable blind structure with frequency selective surfaces(FSS) for the building applications are presented. Frequency transmission characteristics for different angles of the proposed blind-FSSs are investigated and verified through simulation and measurement. The simulation results show that we can implement the reconfigurable blind-FSS for multiband wireless applications. To verify the proposed paper, two kinds of blind-FSSs, crossed dipole FSS and circular ring FSS are fabricated and measurements are performed for different angles. The proposed structure in this paper which is very simple, can be easily applied to any planar surface for wireless security applications at low cost.