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Low voltage and medium voltage pin type insulator

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 drawings

Low voltage and medium voltage pin type insulator drawings

Low voltage and medium voltage pin type insulator drawings
Low voltage and medium voltage pin type insulator specifications:

 

ANSI Class
55-1
55-2
Insulator Type
Plain
Radio Freed
Plain
Radio Freed
Neck Designation in accordance with ANSI C29.5
C
C
Voltage Rating (U.S.Practice) /KV
7.2
7.2
Leakage Distance/in (mm)
4(102)
5(127)
Dry Arcing Distance/in (mm)
2-1/4(57)
3-3/8(86)
Minimum Pin Height/Average/lb (kN)
3,000(13.3)
2,500(11.1)
 
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
Negative/kV
70
70
95
85
Low Frequency Puncture Voltage/Average/kV
50
70
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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