CA01065E_Catalog 70

ARRESTERS

Insulating Base Brackets

When specified distribution arresters come equipped with an insulating base bracket with integrated GLD. Each insulating bracket has unique electrical properties based on the system voltage where the associated arrester is applied. In the remote case of arrester short circuit, the insulating bracket must withstand system voltage until the shorted arrester can be replaced. This can be problematic in some locations, so Hubbell has developed a High Track Resistant (HTR) insulating bracket. This bracket is capable of withstanding system voltage indefinitely. The following table provides relevant characteristics for each insulating bracket.

Power Frequency Withstand (kV) Dry Wet

Duty Cycle Voltage, Ur (kV)

Leakage Distance - in (mm)

Bracket Type MCOV (kV)

BIL (kV)

Short

2.55 - 10.2

3 - 12

4.37 (111)

75

40

30

Medium

12.7 - 19.5

15 - 24

7.24 (184)

80

45

35

Long

22 - 36

27 - 45

9.25 (235)

95

55

45

High Track Resistant

2.55 - 36

3 - 45

9.56 (243)

105

60

50

The figures below provide relevant physical dimensions for the various insulating brackets. Additional dimensions are specific based on the use of metric or imperial terminals. For other options and additional support please contact your Hubbell representative.

0.56 (14)

0.56 (14)

DIA

DIA

2.5 (64)

1.5 (38)

5.0 (127)

0.75 (19)

0.75 (19)

2.25 (108)

0.82 (21)

0.56 (14)

Short

Medium

0.56 (14)

DIA

0.53 (13) DIA

1.5 (38)

1.5 (38)

6.0 (152)

7.0 (178)

0.75 (19)

0.50 (13)

0.82 (21)

0.63 (16)

High Track Resistant

Long

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