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Articles by Saleh A. Al-Jufout
Total Records ( 3 ) for Saleh A. Al-Jufout
  Saleh A. Al-Jufout and Emad S. Addasi
  This study presents, a theoretical approach to develop a digital protection method against 3-phase short circuits on radial electrical power systems that decreases the fault clearance time and thus, increases the stability of the system. The criterion used in this proposed, protection method is the inclination angle of the envelope of the short-circuit current. The concept of the current envelope has been introduced and its change during 3-phase faults has been analyzed. The inclination angle has been calculated and its use as a criterion for protection against 3-phase faults on radial electrical power systems has been discussed. The suggested protection method has been developed with the use of mathematical modelling of the radial electrical power system. The mathematical model has been represented as a system of differential equations for currents and a system of algebraic equations for bus voltages. This model has been formulated in a rectangular coordinate system and has been developed for both steady-state and transient analyses. The curves of the envelope of the short-circuit currents during the first 2 milliseconds after the fault instant and the time grading diagrams of the proposed protection method have been illustrated.
  Saleh A. Al-Jufout
  The mathematical model of the three-phase, synchronous phase modifier has been developed. This model has been represented as a system of six (salient-pole machine) and eight (nonsalient-pole machine) differential equations for flux-linkages and angular velocity determination. The differential equation for the flux-linkages of the stator, amortisseur and excitation windings have been expressed in synchronously rotational rectangular direct and quadrature coordinates. Both the rotational and transformation electromotive forces have been taken into consideration in the stator differential equations. The additional resistance for excitation current winding. The currents in both axes have been presented in matrix form. The curves of the synchronous phase modifier angular velocity; field and stator currents during induction starting have been calculated and illustrated.
  Saleh A. Al-Jufout
  The mathematical model of the open-circuit transition wye-delta controller has been developed. Two possible delta configurations have been taken into consideration. The dynamic behavior of the motor starting using the open-circuit transition wye-delta controller with different delta configurations has been analyzed. A comparative study between the two delta configurations has been performed and a recommendation to avoid excessive undesirable inrush values of the motor current and the electromagnetic torque has been given. The inrush values of the motor current, electromagnetic torque and acceleration time have been considered as criteria in the comparative study. Curves of the phase currents and electromagnetic torque for motor starting using each of the delta configurations have been illustrated.
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