| Class ANSI | Main Demension in( mm) | Leakage Distance in (mm) | Min.Pin Length in (mm) | Cantilever Strength 1b (KN) | Flashover Voltage | Powe Frequency Puncture voltage KV | Radio Influnce Voltage | ||||||||||
| D | H | d | d1 | h | R1 | R2 | Power Frequency | Critical impulse | Test Voltage To Ground KV | Max Riv At 1 MHz V | |||||||
| Dry KV | Wet KV | Positive KV | Nagative KV | ||||||||||||||
| 55-1 | 71/2 (190) | 5 (146) | 31/2 (89) | 11/2 (35) | 2 (51) | 3/4 (19) | 9/16 (14) | 13 (330) | 6 (152) | 2500 (11) | 95 | 60 | 150 | 190 | 130 | 15 | 100 |
| 55-2 | 9 (229) | 61/2 (165) | 4 (102) | 13/8 (35) | 2 (51) | 3/4 (19) | 9/16 (14) | 17 (432) | 7 (178) | 3000 (13.2) | 110 | 70 | 175 | 225 | 145 | 22 | 100 |
| 55-3 | 101/2 (167) | 71/2 (191) | 4 (102) | 13/8 (35) | 2 (51) | 3/4 (19) | 9/16 (14) | 21 (533) | 8 (203) | 3000 (13.2) | 125 | 80 | 200 | 265 | 165 | 30 | 200 |
| 55-4 | 12 (305) | 91/2 (241) | 13/8 (35) | 2 (51) | 3/4 (19) | 9/16 (14) | 27 (685) | 10 (254) | 3000 (13.2) | 140 | 95 | 225 | 310 | 185 | 30 | 200 | |
| 55-5 | 131/2 (343) | 121/2 (318) | 13/8 (35) | 2 (51) | 3/4 (19) | 9/16 (14) | 34 (864) | 12 (305) | 3000 (13.2) | 175 | 125 | 270 | 340 | 225 | 44 | 200 | |
1.Low- and Medium-Voltage Pin Type Insulators (ANSI Standard):
1)These insulators are commonly used for voltages up to 7.2 kV.
2)They come in different ANSI classes (e.g., 55-1, 55-2) and insulator types (plain or radio-freed).
3)Key specifications include:
(1)Leakage Distance: Typically 4 inches (102 mm) for ANSI Class 55-1 and 5 inches (127 mm) for ANSI Class 55-2.
(2)Dry Arcing Distance: About 2-1/4 inches (57 mm) for ANSI Class 55-1 and 3-3/8 inches (86 mm) for ANSI Class 55-2.
(3)Voltage Ratings: 7.2 kV.
(4)Flashover Voltages:
Low-frequency dry: 35 kV.
Low-frequency wet: 20 kV.
Critical-impulse positive: 50 kV.
Critical-impulse negative: 70 kV.
4)These insulators are suitable for low- and medium-voltage applications.
2.High-Voltage Pin Type Insulators (ANSI Standard):
1)Designed for higher voltages (e.g., 23 kV).
2)ANSI Class 56-1 is an example.
3)Specifications include:
(1)Leakage Distance: Approximately 13 inches (330 mm).
(2)Flashover Voltages:
Low-frequency dry: 65 kV.
Low-frequency wet: 35 kV.
Critical-impulse positive: 100 kV.
Critical-impulse negative: 130 kV.
4)These insulators are made of wet-process porcelain and meet ANSI/NEMA C29.6 standards.
3.Special Designs:
1)In areas with high contamination, special pin insulators are used.
2)These designs account for specific environmental conditions.
