(10 pts) 8. Refer to the lightning arrester application table below av) avi 15 4
ID: 2268101 • Letter: #
Question
(10 pts) 8. Refer to the lightning arrester application table below av) avi 15 48 6 0 1247 161 32.13 110 3, 2494 145 145 400 What arrester voltage ratingts) would you seleet for a. i. an ungrounded 4.16 kV system ii. an effectively-grounded 13,8 kV system ii a high-impedance grounded 34,5 kV system You are specifying arresters for a transformer serving a broadeast antenna on top of i 13,600n (above sea level) mountain in Colorado, What arresters specifications might have to be derated due to the altitude? Why b.Explanation / Answer
a. i) for 4.16KV ungrounded system - 45KV
ii)for 13.8KV effectivel grounded system - 12KV
iii) for 34.5KV high impedance grounded system - 39KV
b. we specify 9kV arrester since it the transformer system voltage shall be 12KV and it shall have grounded neutral.
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