UNI-T UT255A Operating Manual page 15

High-Voltage
Terminal
Arrester
Ground Line
Measuring Leakage
Current of Zinc Oxide
Arrester
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High-Voltage
Terminal
Arrester
Ground Line
Notes:
Given the fact that leakage current should be lower than 500uA for running
arrester(Just for reference, specific data are subject to standards of target
country /state), we can tell working status of arrester based on measured
leakage current. If leakage current is over 500uA and ruling out high-voltage
factor, the arrester may have been contaminated, moisture-affected and
aging to cause this problem. The more flow of leakage current it is, the
more severe the phenomenon is. The operator can decide to repair the
arrester or discharge it for lab testing based on leakage current flow so as
to avoid blind operations.
Press HOLD button to return to general measuring mode if under HOLD
mode.
Press HOLD button to return to general measuring mode if under data
access mode.
.
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