The Damage of ZnO Arrester Block Due To Multiple Impulse Currents
Abstract: A lightning arrester
installed in an electrical power system is designed to protect some electrical
equipment against damage due to lightning impulse strike. However, if there is
a multiple impulse current
striking a lightning arrester, it may damage
the lightning arrester itself and then, as a result, it cannot provide lightning protection
to the electrical equipment anymore. In
this research, three peak values of lightning impulse current,which were 600, 1300, and 2500A, each of which had 5
repetitive impulse current, was applied
to a 5000A (1p.u.) ZnO block of a 24kV nominal voltage lightning arrester
having seven ZnO block units. The results of research showed that by applying
impulse current of the order of
600(0.12), 1300(0.26), dan 2500(0.5) A(p.u.), making the ZnO block damage as
much as 26.58, 50, and 100% concecutively. In addition, the damage of the ZnO
block appeared as permanen low value of residual voltage as low as more than 5%
of the new ZnO block residual voltage. If the ZnO block is still being used in
a lightning arrester in electrical power system, it may result in the opening
of a circuit breaker and possibly making electrical power outages from a number
of electrical power customers.
Author: Tarcicius Haryono, K.
Tunggul Sirait, Tumiran Tumiran, Hamzah Berahim
Journal Code: jptkomputergg110024
