Megger test results
Megger test results
(OP)
We are getting megger test resulst back on new lightning arresters with the follwoing values:
Phase A - 6,000 megohms
Phase B - 56,000 megohms
Phase C - 7,000 megohms
Any reason to be concerned about on the large discrpeancy in Phase B or possible causes?
Thanks.
Phase A - 6,000 megohms
Phase B - 56,000 megohms
Phase C - 7,000 megohms
Any reason to be concerned about on the large discrpeancy in Phase B or possible causes?
Thanks.






RE: Megger test results
If so possibly due to incorrect gap size, corrosion, poor connection somewhere in circuit?
Does manufacturer give installation/commissioning details.
rolmag175
RE: Megger test results
What are specifications for each? (High resistance, or low?)
RE: Megger test results
RE: Megger test results
At what voltage are you testing?
What voltage are the arrestors rated for?
RE: Megger test results
Moral: don't do megger tests with MOVs on the system because the results are often confusing.
RE: Megger test results
Called manufacturer. They stated that the phase B arrestor may be a different voltage rating (10kV vs 12kV) which may be causing the big swing. That doesn't make sense to me.
Still not sure if the big swing in megohm on phase b is a concern. I am having retesting perforomed to see if this was a typo or operator error.
Thanks.
b
RE: Megger test results