The distribution class surge arrester is the most common type of protective devices used on power systems today. The polymer housed metal oxide surge arrester is all called composite insulation surge arrester.
The primary function of the distribution surge arrester is to protect the insulation of distribution class oil-filled transformers. Surge arrester is a kind of overvoltage protector, which is mainly used to protect various electrical equipment (transformers, switches, capacitors, wave arresters, transformers, generators, motors, power cables, etc.in power systems, railway electrification systems, and communication systems. ) is protected from atmospheric overvoltage, operating overvoltage and power frequency transient overvoltage, etc., and is the basis for the insulation coordination of power systems. The core element (resistor sheet) of the metal oxide arrester adopts an advanced formula based on zinc oxide, which has very excellent nonlinear (volt-ampere) characteristics, that is, under normal operating voltage, the current passing through is only microampere level. , When subjected to overvoltage, the passing current reaches thousands of amperes instantaneously, making the arrester in a conducting state and releasing overvoltage energy, thereby effectively limiting the damage of overvoltage to power transmission and transformation equipment.
Post time: Dec-18-2025