Utility feedback after LLPD deployment published at CIRED 202128.10.2021
CIRED 2021 is an opportunity to hear new research, ideas and initiatives, and interact with hundreds of key decision leaders in the electricity distribution field.
Our colleague Mr. Mohd Faris Ariffin, from Tenaga Nasional Berhad, participated in the 26th International Conference & Exhibition on Electricity Distribution, that was hosted virtually this year, with an article summarizing LLPD deployment feedback aggregated over several years.
This paper focuses on the use of a line lightning protection device (LLPD) for the improvement of 33kV line lightning performance in the TNB Distribution Network. This initiative is part of the TNB Distribution Network Modernization Initiative that seeks long term and efficient solutions for medium voltage overhead lines (MV OHL) lightning protection issues. MV OHL that cut across open areas, i.e. without any natural shielding, are subjected to frequent direct lightning strikes, based on local lightning data from the TNB Research Lightning Detection System Network (LDSN). The current lightning protection installed on MV OHL is the metal oxide varistors (MOV) Line Surge Arrester (LSA) Class II, as per the IEEE 1410 Guide for Improving the Lightning Performance of Electric Power OH Distribution Lines. However, the earthing system high resistance and the high soil resistivity values can affect the LSA service life. MOV LSA requires low earthing resistance so surge current can be discharged and dispersed effectively to ground.
It has been observed that a reduction of 95% transient interruption rate due to lightning has been achieved after the installation of 180 units of the LLPD on the MV OHL in 2016, where conventional MOV LSA is unable to do so in this high soil resistivity area and the high pole earthing resistance of this line.
TNB Distribution Network (TNB DN), through the Distribution Technical Committee, dated 30th October 2017, acknowledged and approved the R&D Project entitled “Implementation and Use of New Line Surge Arrester Technology for 33kV Overhead Line in TNB with Application in High Soil Resistivity Areas”, based on the major findings of the project and recommendations garnered. Eventually, TNB DN received 1500 units of LLPD starting in June 2020, for installation on various poles and mini towers in the TNB DN 33kV OHL system.
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