Formula of direct current zinc oxide resistance chip

Abstract

The invention discloses a formulation of an AC zinc oxide resistance chip. The formulation is characterized by comprising the following additives and a main material ZnO by weight percentage: 4.0 to 4.9 percent of Bi2O3, 3.0 to 4.0 percent of Sb2O3, 0.5 to 1.0 percent of SiO2, 2.0 to 3.0 percent of Co2O3, 0.50 to 0.80 percent of Cr2O3, 0.50 to 0.80 percent of MnCO3, 0.70 to 0.90 percent of NiO, 0.03 to 0.05 percent of aluminum nitrate, 0.10 to 0.20 percent of glass dust, 0.07 to 0.10 percent of B2O3 and 85.0 to 88.0 percent of ZnO. The formulation of the resistance chip has the following characteristics and advantages: the nickel protoxide and the glass dust are introduced into the formulation, so that the stability and the aging performance of the internal structure of the resistance chip is more excellent; and 2, dosage of cobalt sesquioxide, dibismuth trioxide and diantimony trioxide are added in the formulation, the mixture ratio of each composition is more reasonable, and the non-linearity coefficient of the resistance chip can be improved, the pressure ratio is reduced, the circulation capability is improved, and the comprehensive performance is excellent.

Description

1. Technical field [0001] The invention belongs to the technical field of resistor sheets for lightning arresters, and in particular relates to a formula of a DC zinc oxide resistor sheet, which is used for making resistor sheets for ultra-high voltage direct current transmission lightning arresters. 2. Background technology [0002] Zinc oxide resistors were first developed in the 1960s. Because of their superior pressure-sensitive properties, they have developed rapidly. According to their uses, they are divided into two types: DC and AC. The DC zinc oxide resistor is a kind of zinc oxide high-voltage varistor, which is the core component of the DC zinc oxide arrester and is widely used in ultra-high voltage DC transmission systems. It is based on the formula composed of zinc oxide and other multi-element metal oxides, and is sintered at high temperature. It is a chip resistor with good nonlinear volt-ampere characteristics, and its performance level restricts the grade of...

AI Technical Summary

Problems solved by technology

However, due to the change of the continuous operating voltage waveform, the traditional AC zinc oxide resistors will soon age and thermally collapse under the action of DC voltage, which cannot meet the requirements of DC transmission for the aging performance of resistors.

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