Discussion
Expulsion gap arrester is commonly limited to systems operating at voltages up to ______.
Answer: B
An expulsion type lightning arrester has a spark gap in series with a fibre tube that produces gas when the arc passes and so blows the arc out. Its breaking capacity and the limits of its protection make it a device for distribution systems, and it is commonly used on systems up to 33 kV. For higher voltages, such as 66 kV or 132 kV, valve type or metal oxide arresters are used, and 3.3 kV is too low a limit for it. The answer is 33 kV, option B.
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