CA01082E_Catalog 30

30 - ARRESTERS

Arrester Selection Guidelines

Selecting the appropriate MCOV of a surge arrester is a critical step in the protection of vital utility equipment. The MCOV of an arrester should be selected to ensure it can withstand the maximum continuous line to ground voltage. The table below provides general guidelines for solidly grounded applications, as well as impedance or undergrounded circuits. A higher rated arrester may be required depending on the exact application. Please consult with Hubbell for additional support to select the appropriate MCOV for your specific application.

Normally Recommended Arrester MCOV for Various System Voltages System L-L Voltage kV Arrester MCOV (kV) Grounded Temporarily Ungrounded, Impedance Grounded or Ungrounded Circuits

Neutral Circuits

Nominal

Maximum

(1)

(2)

2.40

2.52 4.37

2.55 2.55

2.55

2.55

4.16

5.1

5.1

4.8 6.9

54

5.1 5.1 5.1

5.1

5.1

7.25 8.74 12.6

7.65 7.65 10.2 12.7 12.7 12.7 19.5 19.5 19.5

7.65

8.32

8.4

12

7.65 7.65 8.4 8.4 12.7 15.3 15.3 15.3

12.7 12.7 12.7 15.3 22 22 22 24 36 48 70 115 131 152 220

12.47

13.1

13.2 13.8

13.9 14.5 21.8

20.78 22.86

24

23

24.2 26.2 36.2 48.3 72.5 145 169 242 362 420 550 800 121

24.94

22 29 39 57 98 115

34.5

22 29 42 70 84 98

46 69 115

138

161

140

230 345 400 500

140

209

209 245

– – – –

– – – –

318

765

470

Notes:

(1) For normal duty. Line-to-ground fault up to 30 minutes. (2) For severe duty. Line-to-ground fault up to 2,000 hours.

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