Title :
Force safety device for substation with flexible buses
Author :
Miroshnik, Roman
Author_Institution :
Israel Electr. Corp. Ltd., Haifa, Israel
Abstract :
Short-circuit current sets the design loads for substation structure with flexible buses for voltage up to 115 kV and sometimes for higher voltage. Nonrecoverable force safety device (FSD) being included in flexible buses can restrict the transmission of great unwanted forces to substation portals. The device operates similar to a safety fuse of any electrical device while being replaced when tripped. The paper deals with theoretical investigation of FSD usage efficiency. Two mathematical models (one is to verify another) are built. The first model is based on the finite difference equations and the second one uses ANSYS finite elements program. The finite difference equations are derived by linearization of nonlinear equations of buses motion. Both models include bus conductor, insulators, FSD, portals masses, and portals stiffness. Results of actual calculations that show the efficiency of FSD are presented.
Keywords :
conductors (electric); finite difference methods; finite element analysis; insulators; linearisation techniques; nonlinear equations; safety; short-circuit currents; substation protection; 115 kV; ANSYS finite elements program; bus conductor; buses motion; design loads; finite difference equations; flexible buses; force safety device; insulators; linearization; mathematical models; nonlinear equations; nonrecoverable force safety device; portals stiffness; safety fuse; short circuit currents; short-circuit current; substation; substation portals; substation structure; unwanted forces transmission restriction; Difference equations; Electrical safety; Finite difference methods; Fuses; Mathematical model; Nonlinear equations; Portals; Safety devices; Substations; Voltage;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2003.817491
