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Annex 6

Preventive Maintenance Schedule for Surge Arresters

S. No.

Tasks assigned

Shut Down (SD) Or Without Shut Down (WSD)

Periodicity

a.

Checking of leakage current (Third Harmonic Resistive Current)

WSD

Yearly

b.

Testing of counters

SD

Yearly

c.

Cleaning of LA insulator

SD

Yearly

d.

Measurement of Capacitance and Tand

SD

In case of requirement

S. No.	Tasks assigned	Shut Down (SD) Or Without Shut Down (WSD)	Periodicity
a.	Checking of leakage current (Third Harmonic Resistive Current)	WSD	Yearly
b.	Testing of counters	SD	Yearly
c.	Cleaning of LA insulator	SD	Yearly
d.	Measurement of Capacitance and Tand	SD	In case of requirement