Zinc-oxide resistor-piece side insulation package device and packing method

Abstract

The packaging set comprises fluid bed and clamping apparatus on the fluid bed. The fluid bed includes upper box, lower box and distribution plate between the upper and lower box. Air in nozzle connected to air current control valve is on the lower box. The said clamping apparatus includes two pieces of grip holders. One holder is connected to rotating shaft. Located between two holders, V shaped mould is in use for placing resistance pieces of zinc oxide. Isolation layers are setup between two resistance pieces. The fluid bed loosens epoxy-insulating powder, keeps it in good condition, and preheats temperature of sidewall of resistance pieces above melting point of epoxy insulating powder. Heat deposition method is adopted for carrying out encapsulation. After thermofixation, excellent insulation protection layer is formed on side faces of resistance pieces of zinc oxide.

Description

technical field [0001] The invention relates to an insulating packaging method for a resistance sheet, in particular to a side insulation packaging device and a packaging method for a zinc oxide resistance sheet. Background technique [0002] In recent years, with the rapid development of the power industry, the research on the overvoltage protection system of power equipment, especially the zinc oxide gapless arrester, has achieved rapid development, and at the same time, it has proposed higher requirements for its high current impact tolerance. Requirements, high current impact withstand is used for sampling test of high current action load test, strong lightning load arrester action load test, preparatory test for operation impact action load test, power frequency voltage withstand time characteristic test and arrester thermal stability test. For surge arresters with a nominal discharge current greater than 5kA, the high current is generally required to reach 65kA, but du...

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Problems solved by technology

The disadvantage of this method is: the coating process will produce harmful volatiles, such as toluene, xylene, etc.; because the rheological properties of the liquid material are difficult to control, the thickness of the insulating material coated on the side of the zinc oxide resistor is not uniform enough, directly Affect its electrical performance; in addition, the density of liquid insulating materials is far less than that of solid packaging materials, and its electrical strength, moisture resistance and heat resistance are poor, so its high current flow generally does not reach 65kA

The disadvantage of this method is that harmful volatiles such as toluene and xylene will also be produced during the coating process; since the rheological properties of liquid materials are difficult to control, the thickness of the insulating material coated on the side of the zinc oxide resistor is not enough Uniformity will also directly affect its electrical properties; in addition, when the glass powder melts, its rheological properties are difficult to control, and the uniformity of the glass glaze is poor, so its high current flow generally still cannot reach more than 65kA

However, due to the complex process and method of epoxy insulating powder used for side protection of zinc oxide resistors, the technology is difficult and cannot be packaged in batches.

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