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Protection will be a good start for the development of the electric industry
Sheath protector special device to prevent lightning and the harm of cable sheath induced over-voltage. Sheath protector and in high voltage cable sheath and earth, between bolt and cable sheath connection, sheath protector is put to use. When installation, high voltage wire end end wire tension should not be greater than 145 n. connection wire insulation level should not be less than the protection of cable outer sheath insulation level, and the connection circuit should be as short as possible. Device must be reliable grounding. Sheath protector with ZnO varistor is a protective device, no series gap, good protective properties, it has excellent nonlinear volt-ampere characteristic curve. Both has the advantages of metal oxide surge arrester of porcelain sleeve type, but also has good electrical insulation properties, high dielectric strength, leakage resistance mark, electrical erosion resistance, heat resistance, cold resistant, aging resistant, explosion-proof advantages and good chemical stability, hydrophobic, sealing. We produce can be widely used in the single-core power cable line, used to protect the metal sheath of the cable from a variety of overvoltage hazard. To better adapt to market demand, convenient user installation use, our company to further develop the cable sheath grounding box directly, sheath protector and cross linking sheath protector etc. Several forms of sheath grounding device. I company production of various cable sheath grounding device has been widely used in various electrified railway system, achieved good operating experience.