Conference Papers

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Subject: search.filters.subject.ICNIRP guidelines

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    E-fields inside 765 kV substation: Influence of conductor & bay arrangements
    (Institute of Electrical and Electronics Engineers Inc., 2017) Singh, S.K.; Punekar, G.S.
    Increasing voltage level in generation and transmission system have become inevitable. The threats of non-ionizing radiation and their biological effects at substations have increased. As per International Commission for Non-Ionizing Radiation and Protection (ICNIRP) guidelines suggest maximum limits for electric and magnetic field exposure is 10 kV/m and 1 mT for occupational and 5 kV/m and 250 μT for public exposure. Keeping this in view results of a case study of electric field distribution in an upcoming 765 kV substation in India are computed and discussed in this paper. Using the existing layout of this substation, the E-fields at 2 m height above the ground plane are computed using FEMM (a free ware). Results show that Bays which are at a height of 14 m from ground are dominant and contributing more to the E-fields. The paper further computes and compares E-field strength due to (i) a single conductor (a phase of bay alone), (ii) single bay (iii) and with all the bays of substation with buses, overhead headlines and ground wires. The effect of bay height (around 14 m) on the E-field is also reported. The average E-field in substation arena is well within the ICNIPR suggested limit of 10 kV/m, whereas E-field at some places exceeds this value. © 2016 IEEE.
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    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.
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    Electric Fields due to A 500 kV Quadruple Circuit Transmission Line: Some Aspects Concerning Public Exposure
    (Institute of Electrical and Electronics Engineers Inc., 2019) Prasad, K.Y.; Punekar, G.S.
    Extra high voltage and Ultra high voltage transmission lines produce high intensity electric fields (E-fields). These high intensity E-fields, which are in the vicinity of such lines, would result into adverse effects on humans. E-fields at the ground level should be below a certain limit as specified by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines from the point of view of public exposure. In the present study the E-fields due to the Quadruple circuit transmission line is estimated and analyzed. Finite element method is used to calculate the E-fields by placing the conductors at the permitted worst-case sag (8%) position for the chosen span. These results are compared with those available in the literature with 4 % sag. © 2019 IEEE.