Porcelain Insulator

ANSI Low & Medium Voltage Pin Insulators

ANSI Low & Medium Voltage Pin Insulators

  • ANSI Low & Medium Voltage Pin Insulators

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1.High reliability through accumulated technology
2.Excellent long-term performance
 
As the name suggests, the pin type insulator is mounted on a pin on the cross-arm on the pole. There is a groove on the upper end of the insulator. The conductor passes through this groove and is tied to the insulator with annealed wire of the same material as the conductor. Pin type insulators are used for transmission and distribution of electric power at voltages up to 33 kV. Beyond operating voltage of 33 kV, the pin type insulators become too bulky and hence uneconomical.

ANSI Class No. 20090 20121 20149 20180 20210
Creepage Distance (inch)(mm) 4 (102) 5 (127) 7 (178) 9 (229) 12 (305)
Dry Arcing Distance (inch)(mm) 2 1/4 (57) 3 3/8 (86) 4 1/2 (114) 5 (127) 6 1/4 (159)
Cantilever Strength (kN) (lb) 13 3000 11 2500 11 2500 13 3000 13 3000
Low Frequency
Flashover voltage (kV)
Dry Anti radio interference type 35 45 55 65 80
Normal type   50 65 70 85
Wet Anti radio interference type 20 25 30 35 45
Normal type   25 35 40 45
Critical Impulse
Flashover(kV)
Pos Anti radio interference type 50 70 90 105 130
Normal type   75 100 110 140
Neg Anti radio interference type 70 85 110 130 150
Normal type   95 130 140 170
Power Frequency puncture voltage (kV) 50 70 90 95 115
RIV Data Test voltage to ground (kV) 5 5 10 10 15
Max. RIV at
1MHz (μV)
Anti radio interference type 50 50 50 50 100
Normal type 2500 2500 5500 5500 8000
Net Weight(kg) 0.5 0.7 1.1 1.6 2.5
Applicable Standard ANSI C29.5

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