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Shock from lightning arrester

Shock from lightning arrester

Shock from lightning arrester

(OP)
Sir,
          In our one substation, we get electrical shock from the portion of the lightning arrester where the counter is connected from the lower side of the lightning arrester. The lightning arrester is connected in one 66kv line incoming side to the yard. The details of the lightning arrester is as given below:
         Make: OBLUM ELECTRICAl INDUSTRIES LIMITED, HYDERABAD,INDIA.
        Rated voltage: 60KV
        Discharging current: 10KA
        Rated frequency: 50HZ
        Pressure Release Class: 40KA
        Long Discharging Class: 3
        Model: ZAO - 60 - SM
        Type: METOVAR
        MCOV: 48KV
        Year: 1992
        
             I request to advice me about what are the checks to be carried out at site in detail.
              Thanks
with regards,
appunni

RE: Shock from lightning arrester

Sounds like your ground is not connected properly or is corroded.  Your step and touch potential should be no more than 70 volts.  Do not disconnect the ground lead.  The frame should be bonded as well.  I am not familiar with you model of LA.  

Best Regards  

Ray Micallef, P. Eng.
Power Generation/Utility Industry

RE: Shock from lightning arrester

Follow IEEE-80 recommendations for surge arrester grounding

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