Surge arresters station class

Since the amplitude of the FOW is more than permissible (16.2 kV for a normal design and 26.9 kV for a special design motor Table 11,6) it is advisable to dampen the amplitude with the help of a surge arrester. Using a 6 kV station class surge arrester of Example 17,6,... 

Select the nearest voltage rating of a station class surge arrester (see also Section 18.8) from the manufacturer s catalogue, (Table 18.8) as 6 kV which has the following protective levels ... 

Table 18.9 Protective characteristics of gapless station class surge arresters for a nominal discharge current of 10 kA ...

Table 18.11 Protective characteristics of a gapless station class surge arrester for, (1) Line discharge class 4, and (2) Single impulse energy capability = 7 k.J/k.V,...

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