A zinc oxide resistor and its preparation method and application

Abstract

The invention relates to the technical field of piezoresistors for lightning arresters, in particular to a zinc oxide resistor and its preparation method and application. The zinc oxide resistance sheet provided by the present invention comprises the following raw materials in molar percentage: 85-95% ZnO, 0.01-4.0% Bi 2 o 3 , 0.01‑4.0% Sb 2 o 3 , 0.05‑3.0% Co 2 o 3 , 0.01‑2.0% MnO 2 , 0.01‑3.0% NiO, 0.01‑2.0% Fe 2 o 3 , 0.01‑2.0% A1 2 o 3 , 0.01‑2.0% Dy 2 o 3 . The zinc oxide resistance sheet provided by the present invention does not need to add the toxic substance Cr 2 o 3 , through ZnO, Bi 2 o 3 , Sb 2 o 3 、Co 2 o 3 , MnO 2 , NiO, Fe 2 o 3 、A1 2 o 3 and Dy 2 o 3 Various components cooperate with each other, so that the zinc oxide resistor has excellent performances such as high potential gradient, high square wave flow capacity, low residual voltage, high square wave current and high current impact resistance, and good aging resistance.

Description

technical field

[0001] The invention relates to the technical field of piezoresistors for lightning arresters, in particular to a zinc oxide resistor and its preparation method and application. Background technique

[0002] Surge arresters are key equipment for power grids and power equipment to prevent lightning strikes and flashover accidents, and zinc oxide resistors are widely used in the manufacture of surge arresters because of their excellent nonlinear volt-ampere characteristics and impact energy absorption capacity. Since Panasonic Corporation of Japan invented the nonlinear zinc oxide resistor in 1968, there have been many manufacturers of zinc oxide resistors and zinc oxide arresters in China, but there is still a big gap in product quality compared with foreign advanced levels. In terms of low flow capacity, small potential gradient, and weak impact resistance. In 2015, my country successfully developed the world's first ±800kV DC line lightning arrester, which ...