page_230

< previous page | page_230 | next page >

Page 230

TABLE 12-1 Basic Insulation Levels

Basic insulation level (Standard 1.5/40-microsecond wave), kilovolts

Insulation voltage class, kilovolts

Arrester voltage rating, kilovolts

Distribution class

Power class

1.2

1

30

45

2.5

3

45

60

5.0

6

60

75

8.66

9

75

95

12

85

102.5

15.0

15

95

110

18

125

23.0

25

150

34.5

37

200

46.0

50

250

69.0

73

350

| Figure 12-10 (A) Sparkover characteristics of distribution class arresters. |

< previous page | page_230 | next page >