la leakage current testing (with graphs)

Area of Measurement: 132 kV Switchyard 220 kV Switchyard 2x50 M 20/25 MVA TR-01 100 MVA TR-01 GT-07 20/25 MVA TR-02 100 MVA TR-02 GT-08 20/25 MVA TR-03 GT-07 Bay 20/25 MVA TR-04 GT-08 Bay 132 kV Tie Line 132 kV Tie Line 132 kV Ras-Bwr Line 30/35 MVA Trafo (U-9) 30/35 MVA Trafo (U-10) 220 kV Merta Line 220 kV Beawar Line Leakage Current Measurement of Lightning Arrestors Measurement Kit Used: Surge Arrestor leakage Curre Model No. SA 30i, Note: The graph has been plotted between the Ir (Corrected) in dates. Brief Theory : The resistive current (Ir) is only 15-25% of the total leakage current. increase in resistive current due to degradation/ageing of Zinc Oxide b affect the total leakage current considerably. The higher resistive lea ultimately bring in the LA to thermal instability and may result in com failure/breakdown of the Arrester. Hence, the resistive leakage current indicator of health of an LA in service. The resistive leakage current depends on the arrester temperature (in p ambient temperature) and the operating voltage. If the temperature and taken into account (uncorrected values), the measured value of the resi current strongly varies. By taking account of the ambient temperature a voltage, measurements performed under different conditions can be direc

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Area of Measurement: 132 kV Switchyard 220 kV Switchyard20/25 MVA TR01 100 MVA TR0120/25 MVA TR02 100 MVA TR0220/25 MVA TR03 !T0" #ay20/25 MVA TR0$ !T0% #ay132 kV Tie &ine 132 kV Tie &ine132 kV Ras#wr &ine 30/35 MVA Trafo '()*30/35 MVA Trafo '(10*220 kV Merta &ine220 kV #eawar &ine&eaka+e ,urrent Measurement Re-ort of &i+htnin+ ArrestorsMeasurement .it (sed: Sur+e Arrestor /eaka+e ,urrent Meter Mode/ 0o1 SA 30i2 MakeSco-e0ote: The +ra-h has 3een -/otted 3etween the 4r ',orrected* in 5A 6 the test dates1#rief Theory : The resisti7e current '4r* is on/y 15258 of the tota/ /eaka+e current1 9ence2 a shar- increase in resisti7e current due to de+radation/a+ein+ of :inc ;

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