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1.Available for any voltage and contamination level by changing number of insulators
2.Mechanical strength up to 530kN
3.High reliability through accumulated technology
4.Excellent long-term performance
Suspension insulators are designed to link together into strings, typically of two or more, to provide much higher voltage protection than any single insulator. Suspension insulators are typically used on high tension power transmission towers as shown below. Porcelain is by far the most commonly used insulating material but there are a number of glass styles as well. Porcelain suspension insulators revolutionized the power distribution industry allowing much higher voltage protection -- there are several 1,000kV DC transmission lines utilizing suspension insulators.
| ANSI Class | 18994 | 19025 | 19054 | 19085 | 19115 | 19146 | 19207 | 19238 | 19268 | ||
| Fig | 1 | 2 | 3 | 4 | 3 | 4 | 3 | 5 | 4 | ||
| Main Dimension (mm) |
Nominal diameter D |
160 | 200 | 254 | 254 | 254 | 254 | 298 | 114 | 298 | |
| Unit spacing H | 140 | 146 | 146 | 146 | 146 | 146 | 146 | 160 | 165 | ||
| Creepage Distance (mm)/（inch) |
178 7 | 210 8 1/4 | 292 11 1/2 | 292 11 1/2 | 279 11 | 279 11 | 279 11 | 171 6 3/4 | 279 11 | ||
| Combined M&E strength (kN)/( lb) |
45 10000 | 70 15000 | 70 15000 | 70 15000 | 111 25000 | 111 25000 | 160 36000 | 45 10000 | 160 36000 | ||
| Mechanical Impact Strength(n.m) |
4.5 | 5 | 5.5 | 5.5 | 6 | 6 | 9 | 4.5 | 9 | ||
| Tension proof test load (kN)/(lb) |
22 5000 | 33.5 7500 | 33.5 7500 | 33.5 7500 | 55.6 12500 | 55.6 12500 | 80 18000 | 22 5000 | 80 18000 | ||
| Power frequency flashover voltage(kV) |
Dry | 60 | 65 | 80 | 80 | 80 | 80 | 80 | 60 | 80 | |
| Wet | 30 | 35 | 50 | 50 | 50 | 50 | 50 | 30 | 50 | ||
| Critical Impulse flashover voltage(kV) |
Pos | 100 | 115 | 125 | 125 | 125 | 125 | 125 | 90 | 125 | |
| Neg | 100 | 115 | 130 | 130 | 130 | 130 | 130 | 100 | 130 | ||
| Power frequency puncture voltage (kV) |
80 | 90 | 110 | 110 | 110 | 110 | 110 | 80 | 110 | ||
| Applicable Standard | ANSI C29.2 | ||||||||||
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