Title :
Accurate modelling of very fast transient overvoltages in a 245kV GIS and research on protection measures
Author :
Rama Rao, J.V.G. ; Amarnath, J. ; Kamakshaiah, S.
Author_Institution :
Dept.of Electr. Eng., B.V.C. Eng. Coll., Odalarevu, India
Abstract :
Based on 245kV GIS substation, very fast transient over voltages caused by disconnecting switch operation of GIS is simulated and calculated in this paper with B2SPICE program. The different protection measures are compared and analyzed, such as adding ferrite rings, adding opening and closing resistor, metal oxide arrester and R-C absorber. A low voltage experiment was conducted to estimate transient overvoltage´s during switching operation. These transient voltages are recorded by using surge sensor and digital storage oscilloscope with sample rate 1GS/s and 500MHz frequency range. Suppression techniques are employed practically to verify the validation of simulation results. The simulation results are closely matched with the experimental results in the case of ferrite rings application in reduction of maximum peak of VFTO generated during switching operation.
Keywords :
digital storage oscilloscopes; gas insulated substations; overvoltage protection; substation protection; surge protection; switching substations; switching transients; B2SPICE program; GIS substation; VFTO; digital storage oscilloscope; ferrite ring; frequency 500 MHz; gas insulated substation; low voltage experiment; overvoltage protection measures; suppression technique; surge sensor; switching operation; transient overvoltage; voltage 245 kV; Ferrites; Geographic Information Systems; Resistors; Surge protection; Surges; Switches; Transient analysis; GIS; MOA; RC Filter; VFTO;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2010 Annual Report Conference on
Conference_Location :
West Lafayette, IN
Print_ISBN :
978-1-4244-9468-2
DOI :
10.1109/CEIDP.2010.5723980
