The full current monitoring of distribution arresters is generally used to monitor the operation and failure of arresters. In this paper

the full current monitoring of distribution arrester is used for studying over-voltage alarm scheme of the system. Firstly

a technical framework of over-voltage alarm scheme implementation is proposed. Further

according to the needs of the framework

the node voltage under different lightning current and operation impulse current is analyzed

and a full current-voltage relationship database of zinc oxide arrester is established. A voltage calculation method with combination of the point selection method of fitting curve and the grey correlation is proposed. According to the analysis

when the correlation degree between the collected current parameters and the relation database samples is more than 91%

the data of the relation database is used for calculation

while when the correlation degree is less than 91%

the fitting formula is used for calculation. As a result

the early warning of over-voltage based on full current monitoring is realized.