Conference Papers
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Item Finite element method magnetics based demonstration of rotating field in 4-pole induction motor(2013) Punekar, G.S.; Devarajan, D.; Tantry, G.H.The explanation related to the concept of Rotating Magnetic Field (RMF) in 3-phase induction motor (IM) and its visualization is a tricky issue in teaching-learning process. The complexity increases with the number of poles. Hence visualization of RMF for a 4-pole Induction motor is attempted via magnetic field distribution pattern(s). The aim of this paper is to explore and utilize the capability of Finite Element Method Magnetics (FEMM) as a tool for demonstrating rotating magnetic field effect produced in the stator of a 3-phase induction motor. In addition to the RMF demo, visual correlation between angular rotations of electrical wave with mechanical degree is reported. Also, the effect of phase sequence reversal is incorporated in the graphical exhibition. © 2013 Springer.Item A comparative study of field computation methods: Charge simulation method and method of moments(Institute of Electrical and Electronics Engineers Inc., 2018) Devarajan, D.; Punekar, G.S.Numerical methods plays a vital role in computation of electric fields for the design of high voltage systems. For electric fields studies related to high voltage applications, the preferred numerical methods are charge simulation method (CSM) and method of moments (MoM). In the present study, the performance of these two numerical methods are analyzed by simulating sphere-plane gap arrangement (which has an analytical solution to compare). Through this example, CSM is found to be more accurate compared to MoM. Further, the effect of change in sphere-plane gap geometry on the electric field computed is reported and discussed. © 2018 IEEE.Item Electric stress on the surface of conductors in an Extra High Voltage substation(Institute of Electrical and Electronics Engineers Inc., 2018) Devarajan, D.; Punekar, G.S.; Kishore, N.K.In high voltage equipment and substations, the electric field distribution on the surface of the conductor is important from the point of designing the insulation systems. In outdoor substation, the atmospheric air acts as an insulation medium and the electric-fields (e-fields) on the surface of the conductors should not exceed the breakdown strength of air (2122 kV/m rms). Based on the analysis of surface e-fields of substation conductors, one can adjudge whether any redesign in terms of conductor effective radius and clearances are required. One such analysis of surface e-fields in a 765 kV substation in central India is carried out. Charge Simulation Method (CSM) is used as a numerical technique. The surface e-field plot on the substation conductors are reported. The highest e-fields are on the surface of transmission line conductors with 1504 kV/m. Thus, the design should work corona free. © 2018 IEEE.Item Spatiotemporal electric field distribution in an EHV substation in view of occupational exposure(Institute of Electrical and Electronics Engineers Inc., 2019) Devarajan, D.; Punekar, G.S.; Kishore, N.K.With the increase in the transmission voltage levels, the effect of non-ionizing radiation (NIR) becomes a major concern. The International Commission on Non-Ionizing Radiation (ICNIRP) provides the guidelines for protection against NIR. It suggests the reference electric field (e-field) value of 10 kV/m for occupational exposure and 5 kV/m for general public exposure for the substation. In view of this, e-field prevailing in a 765 kV generating substation is studied in the present work to assess the spatiotemporal distribution using charge simulation method (CSM) based model. This should give a feel of the possible threat posed by these fields to the working personal due to NIR. The upcoming EHV substation in central India is considered with its bays, transmission lines, buses, and ground wires. The instantaneous values of e-field are computed at different instances over the 50 Hz voltage cycle, at 2 m height above the ground plane over the entire substation arena. The demo of spatiotemporal variation of e-field computed at different instants of time over a cycle using simulating charges taken from the real-number-field will be presented and discussed during the presentation. This would result in a time-space changing e-field-force, and give a feel of creation of churning of air and electric wind. This will have much higher significance at the heights were conductors are placed where the e-fields are higher. It is also shown that because of spatiotemporal variation of e-field, the rms value of e-field can be easily obtained using simulating charges taken from complex-number-field which is of significance from the point of view of ICNIRP guidelines. © 2019 IEEE.