Working Principle, Function, Characteristic and Application of Cable Protectors
Working Principle: Under normal working conditions, the cable protector presents high resistance. At this time, the current flowing through the sheath protector is very small, which will not affect the operation mode of the cable sheath. When the overvoltage intrudes, the sheath at the ungrounded end or the sheath cross-transposition interconnection will have a higher impulse overvoltage. At this time, the sheath protector presents a smaller resistance, which makes the overvoltage energy more easy to flow into the earth through the protector, and the protector itself will not be damaged, and then the ungrounded end will return to a high resistance state.
The function of cable protector: in recent years, with the development of modern industry, more and more power cables are used in cities. The power sector urgently needs to solve the problem of insulation protection of cable sheath, and constantly requires the manufacturing sector to provide safe and reliable cable protectors, which can not only ensure the safe power supply of the cable, prolong the service life of the cable, improve the economic value and transmission capacity of the cable, but also reduce the overvoltage of the sheath to the ground, avoid the breakdown of the outer sheath and ensure the reliable operation of the cable.
Characteristic of cable protector: Cable protector adopts ZnO varistor as protective element. It has no series gap, good protective characteristic and excellent non-linear volt-ampere characteristic curve.
Application of cable protector: The cable protector is installed between the metal protective layer of the cable and the ground and is a kind of protective device used to protect the metal protective layer of the cable from various overvoltage hazards.