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A lightening arrester connected between the line and earth in a power system protects the terminal equipment

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A lightening arrester connected between the line and earth in a power system 

(1) protects the terminal equipment against travelling surges (2) protects the transmission line against direct lightening strokes (3) suppresses high frequency oscillations in the line (4) reflects back the travelling wave approaching it
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A lightening arrester connected between the line and earth in a power system protects the terminal equipment against travelling surges

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