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Low voltage and medium voltage pin type insulator is made according to the ANSI standards. Low voltage and medium voltage pin type insulator types are 55-1, 55-2, 55-3, 55-4, 55-5, 55-6, and 55-7.
Low voltage and medium voltage pin type insulator drawings:
Low voltage and medium voltage pin type insulator specifications:
|
ANSI Class
|
55-1
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55-2
|
|||||
|
Insulator Type
|
Plain
|
Radio Freed
|
Plain
|
Radio Freed
|
|||
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Neck Designation in accordance with ANSI C29.5
|
C
|
C
|
|||||
|
Voltage Rating (U.S.Practice) /KV
|
7.2
|
7.2
|
|||||
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Leakage Distance/in (mm)
|
4(102)
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5(127)
|
|||||
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Dry Arcing Distance/in (mm)
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2-1/4(57)
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3-3/8(86)
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|||||
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Minimum Pin Height/Average/lb (kN)
|
3,000(13.3)
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2,500(11.1)
|
|||||
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Average Flashover Voltage
|
Low-frequency
|
Dry/kV
|
35
|
35
|
50
|
45
|
|
|
Wet/kV
|
20
|
20
|
25
|
25
|
|||
|
Critical-impulse
|
Positive/kV
|
50
|
50
|
75
|
70
|
||
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Negative/kV
|
70
|
70
|
95
|
85
|
|||
|
Low Frequency Puncture Voltage/Average/kV
|
50
|
70
|
|||||
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Radio-Influence Voltage Date
|
Test Voltage to Ground/kV
|
5
|
5
|
5
|
5
|
||
|
Maximum RIV at 1,000kHz/μV
|
2,500
|
50
|
2,500
|
50
|
|||
|
Net Weight/lb
|
1.2
|
1.4
|
|||||
|
ANSI Class
|
55-3
|
55-4
|
55-5
|
|||||||||
|
Insulator Type
|
Plain
|
Radio
Freed
|
Plain
|
Radio
Freed
|
Plain
|
Radio
Freed
|
||||||
|
Neck Designation in accordance with ANSI C29.5
|
C
|
F
|
F
|
|||||||||
|
Voltage Rating (U.S.Practice)/KV
|
7(178)
|
9(229)
|
12(305)
|
|||||||||
|
Leakage Distance/in (mm)
|
4-1/2(114)
|
5(127)
|
6-1/4(159)
|
|||||||||
|
Dry Arcing Distance/in (mm)
|
5(127)
|
5(127)
|
6(152)
|
|||||||||
|
Cantilever Strength/Average/lb (kN)
|
2,500(11)
|
3,000(13)
|
3,000(13)
|
|||||||||
|
Average Flashover Voltage
|
Low-frequency
|
Dry/kV
|
65
|
55
|
70
|
65
|
85
|
80
|
||||
|
Wet/kV
|
35
|
30
|
40
|
35
|
45
|
45
|
||||||
|
Critical-impulse
|
Positive/kV
|
100
|
90
|
110
|
105
|
140
|
130
|
|||||
|
Negative/kV
|
130
|
110
|
140
|
130
|
170
|
150
|
||||||
|
Low Frequency Puncture Voltage/Average/kV
|
90
|
95
|
115
|
|||||||||
|
Radio-influence Voltage Date
|
Test Voltage to Ground/kV
|
10
|
10
|
10
|
10
|
15
|
15
|
|||||
|
Maximum RIV at 1,000kHz/μV
|
5,500
|
50
|
5,500
|
50
|
8,000
|
100
|
||||||
|
Net Weight/lb
|
2.4
|
3.7
|
6.4
|
|||||||||
|
ANSI Class
|
55-6
|
55-7
|
||||
|
Neck Designation in accordance with ANSI C29.5
|
J
|
J
|
||||
|
Voltage Rating (U.S.Practice) /KV
|
13.2
|
13.2
|
||||
|
Leakage Distance/in (mm)
|
15(381)
|
15(381)
|
||||
|
Dry Arcing Distance/in (mm)
|
8(203)
|
8(203)
|
||||
|
Minimum Pin Height/Average/lb (kN)
|
7-1/2(190)
|
7-1/2(190)
|
||||
|
Average Flashover Voltage
|
Low-frequency
|
Dry/kV
|
100
|
100
|
||
|
Wet/kV
|
50
|
50
|
||||
|
Critical-impulse
|
Positive/kV
|
150
|
150
|
|||
|
Negative/kV
|
170
|
170
|
||||
|
Low Frequency Puncture Voltage/Average/kV
|
135
|
135
|
||||
|
Radio-Influence Voltage Date
|
Test Voltage to Ground/kV
|
22
|
22
|
|||
|
Maximum RIV at 1,000kHz/μV
|
Radio Freed
|
100
|
100
|
|||
|
Plain
|
8000
|
8000
|
||||
|
Net Weight/lb
|
8.5
|
8.5
|
||||
Low voltage and medium voltage pin type insulator Surfaces coated with semi-conductive glaze considered as effective leakage surfaces and the distance over them is included in the leakage distance. Top-and wire groove of 55-1 and 55-2 shall seat a mandrel with a diameter of 15/16 inch. The side-wire groove shall seat a mandrel with a diameter of 1-1/16 inches. The top-wire groove of 55-3, 55-4 and 55-5 shall seat a mandrel with a diameter of 1-3/4 inches. The side-wire groove of 55-6 and 55-7shall seat a mandrel with a diameter of 1-1/8 inches. The top-wire groove shall seat a mandrel with a diameter of 1-3/4 inches.
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