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Explosive Fuse for Outdoor Insulator Test

IP.com Disclosure Number: IPCOM000199885D
Publication Date: 2010-Sep-20
Document File: 3 page(s) / 61K

Publishing Venue

The IP.com Prior Art Database

Abstract

An explosive fuse that can be used for outdoor insulator aging/pollution test, which has low current capacity and voltage cut-off capability. The fuse can safely cut the high voltage physically when over-current happens. The design can made the length of the fuse shorter, and the surface flashover is avoided. By physical detachment of two end fitting, the design can avoid the surface flashover of the fuse tube when fuse element melts. It can be used for high voltage test and cut the fault test sample out of the power line without power off of the whole system. This invention is related with a special fuse which is used for long-term aging test or pollution test. The fuse has small rated current capacity (e.g. lower to 0.2A) and can be easily changed. It can be used for high voltage insulator aging test and protect the power source (e.g. test transformer) by cutting off the fault insulator. The fuse can be connected with a elastic conductive wire (which can be linked to high voltage power line) and pull back the connected end-cap by retraction force when the fuse explodes. This kind of combination ( the fuse connected with elastic wire) can be very useful for outdoor aging test, which can cut power off without worrying about the surface flashover of the fuse after the fuse element melts. And the fuse can be short enough to meet the space requirement. It's easy to find the fault test objects because an visualized break is formed after the fuse explodes.

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Title: Explosive Fuse for Outdoor Insulator Test

Principal Applications/Uses of the Invention

1. An explosive fuse that can be used for outdoor insulator aging/pollution test, which has low current capacity and voltage cut-off capability.

2. The fuse can safely cut the high voltage physically when over-current happens. The design can made the length of the fuse shorter, and the surface flashover is avoided.

Problem Overcome by the Invention

   By physical detachment of two end fitting, the design can avoid the surface flashover of the fuse tube when fuse element melts. Can be used for high voltage test and cut the fault test sample out of the power line without power off the whole system.

Detailed Description of the Invention

Fig. 1

   The fuse contains porcelain tube with two metal end-caps. Number 2 and 9 note the metal end-cap, normally made of copper. Lengthwise ends of fuse element 5 are fitted on the metal end-caps by passing through two small holes (1 and 10) and welded on the end-cap. The metal end-caps (2 and 9) are stuck on the porcelain tube (7) by ceramic adhesive (3, 8, 13 and 17). Thermal isolate material (numbered with 4, 12,15 and16) is used to keep the inner temperature stable and protect the fuse (5) and explosive filler (6) from vibration. An arc discharge occurs immediately after the fuse element (5) melts due to an over-current. The explosive filler (6) acts as gas generator when triggered by arc discharge, which destroys the whole fuse tube and detached the metal end-caps. Two holes (11 and 18) are used for fastening the power connection line. As shown in Fig.2, the fuse is normally connected by elastic conductive line. The tension strength on both sides of the fuse is within the bond strength between end-caps and porcelain tube. When the fuse explodes due to an over-current, the broken of the porcelain makes the end- caps separated and the elastic conductive line will pull back the metal end-caps and a big air gap is achieved. The fuse is made small, and the distance between the two caps is reduced. The reduction of the distance between the caps makes an arc discharge occurring at the time of fusion of the fuse ele...