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Porcelain insulators,also named ceramic Insulators are made from clay, quartz or alumina and feldspar, and are covered with a smooth glaze to shed water. Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Porcelain has a dielectric strength of about 4–10 kV/mm.
Features:
1.In comply with ANSI, IEC, BS, AS etc standard
2.Brown or grey glazed
3.The material is porcelain
Parameter：
| lass ANSI | Mian Demension in (mm) | lea- kage Dist-ance in (mm) | Min.Pin Length in (mm) | Cantilever Strength 1b(KN) | Average Flashover Voltage | Power Frequ-aency Pun- cture Volt-age KV | Radio influence Voltage | ||||||
| D (max) | H | h | Power Frequency | Critcal Impulse | Test Voltage To Ground KV | Max Riv At 1MHz V | |||||||
| Dry kv | Wet kv | Pos-itive kv | Nag-ative kv | ||||||||||
| 55-1 | 3 1/4 (83) | 3 1/2 (89) | 1 3/4 (44) | 4(102 | 4(102) | 3000(13) | 35 | 20 | 50 | 70 | 50 | 5 | 2500/ 50 |
| 55-2 | 3 3/4 (95) | 3 1/4 (83) | 1 1/2 (38) | 5(127) | 4(102) | 2500(11) | 50/45 | 25 | 75/ 70 | 95/ 85 | 70 | 5 | 2500/ 50 |
| 55-3 | 4 3/4 (121) | 3 3/4 (95) | 1 1/2 (38) | 7(178) | 5(127) | 2500(11) | 65/55 | 35/30 | 100/ 90 | 130/ 110 | 90 | 10 | 5500/ 50 |
| 55-4 | 5 1/2 (140) | 4 3/8 (111) | 1 3/4 (44) | 9(229) | 5(127) | 3000(13) | 70/65 | 40/35 | 110/ 105 | 140/ 130 | 95 | 10 | 5500/ 50 |
| 55-5 | 7 (178) | 4 7/8 (124) | 2(51) | 12(305) | 5(152) | 3000(13) | 85/80 | 45 | 140/ 130 | 170/ 150 | 115 | 15 | 800/ 100 |
