Need help about lightning arrester/surge arrester

so i'm working on a project about the usage of multiple lightning arrester by paralleling it, with 2 or 3 arresters.
and my project mainly discuss about the discharge current ( current flowing through the arrester to ground)
so how would be the effect exactly??

the theory says, that arester is a resisstive component, and when you use multiple of it, the resistive value would increase, just lie the equation (1/ I total) = (1/R1)+(1/R2)+(1/R3)+.....+(1/Rn)
so if I'm using 2 arresters, the discharge current would be doubled, and if I'm using 3, the current would be multiplied by 3, right?

but in my project, by using 1 arrester I get the discharge current of 119,884 Amperes
yet, when I'm using 3 paralleled arresters, the discharge current is only 182,1012 Amperes..

is the theory wrong? or is there anything that i missed that causes this??
please help me

a little bit correction about the theory, the total ressistive value would decrease, and with the resistive value decreased, the current value would be increased ( V=I*R)

In a static situation, ohms law may apply, but you are talking about a dynamic one, where non linear characteristics become important, arresters are non linear devices.
There will also be finite lead inductance, thus without a lot of care in the design, it is probable that one device in a parallel connection will take the brunt of the discharge, the current surge front will be delayed by differing amounts to the various devices,
cheers,
Richard

hello Richard, thanks for answering
sorry if my reply is a bit late, but what you're saying is definitly my problem as i overlooked that the arrester is a non-linear device.
as I've been asking here and there, the other trouble are "accumulate damage" from triggering, which leads to non-repeatable result of the current measured. And the peak current that the impulse generator produces, which makes the current won't simple be tripled.
once again, thanks for answering

Regards,
Narasura