Title :
Calculation of very fast transient over-voltage in transformer windings
Author :
Yanju, Liu ; Yundong, Cao ; Youhua, Gao ; Tong, Sun ; Jian, Wang
Author_Institution :
Shenyang Ligong Univ., Shenyang
Abstract :
Finite-difference time-domain (FDTD) method is introduced to calculate the transient over-voltage of transformer windings using multi-conductor transmission lines (MTL) model. The termination of windings is characterized by VFTO, which is caused by disconnector switching off short bus. Discrete formulation of transformer windings in the time domain is given. Several representative curves with respect to time in transformer windings are illustrated. The maximums of over-voltage and electric field intensity generated in wire coils and in wire turns are also given. It is essential for transformer´s insulation design.
Keywords :
finite difference time-domain analysis; multiconductor transmission lines; overvoltage; switching transients; transformer insulation; transformer windings; electric field intensity; finite-difference time-domain method; multi-conductor transmission lines model; transformer insulation; transformer windings; very fast transient over-voltage; wire coils; wire turns; Capacitance; Circuits; Coils; Electromagnetic transients; Finite difference methods; Inductance; Power system transients; Power transformer insulation; Windings; Wire;
Conference_Titel :
Electrical Machines and Systems, 2007. ICEMS. International Conference on
Conference_Location :
Seoul
Print_ISBN :
978-89-86510-07-2
Electronic_ISBN :
978-89-86510-07-2
