2024 fuse link auxiliary tube types

Fuse link auxiliary tube comprises at least one inner layer of paper, at least one layer of polymer film over the at least one inner layer of paper, and at least one outer layer of paper over the at least one layer of polymer film. The at least one inner layer of paper, the at least one layer of polymer film, and the at least one outer layer of paper are wound into a tube shape. An acrylate or acetate layer over the at least one outer layer of paper may be used to structurally reinforce the fuse link auxiliary tube. The paper may be high dielectric strength Kraft paper, fish paper, etc. The polymer film may be polyester film, e.g., MYLAR®.

The patent describes the utilization of three distinct materials for the fuse link auxiliary tube: Kraft paper, fish paper, and a hybrid material featuring fish paper inner and outer layers sandwiched between a polymer film layer. The distinguishing characteristics of these materials are as follows:

1. Kraft Paper:
-Material Makeup: Wood pulp serves as the primary component of kraft paper, rendering it exceptionally robust and long-lasting.
– Electrical Shielding: This paper variety effectively blocks external electrical disturbances, thereby safeguarding the fuse link from potential interference.
-Affordability: Kraft paper stands out for its budget-friendly nature, making it a more economical choice compared to alternative materials.

2. Fish Paper:

Material Makeup: Comprising cotton rag or wood pulp, fish paper, also referred to as vulcanized fiber, boasts exceptional electrical insulation capabilities.
-Electrical Performance: With its remarkable dielectric strength, fish paper is perfectly suited for a wide range of electrical uses.
-Adaptability: This versatile material can be easily molded to fit various shapes, ensuring a secure and precise fit around the fuse link.

3. Composite Material (Fish Paper Inner and Outer Layers with Polymer Film Layer):
– Composition: This material consists of fish paper inner and outer layers with a polymer film layer sandwiched in between.
– Insulation: The fish paper layers offer excellent electrical insulation, while the polymer film layer enhances insulation and provides additional protection.
– Flexibility: The combination of fish paper and polymer film allows for flexibility and conformability around the fuse link.
– Durability: The polymer film layer enhances durability, providing resistance against tearing and puncturing.

The auxiliary tube connected to the fuse helps with low current interruptions in the distribution level fuse circuit breaker, such as less than 1000 amperes. They are usually made of fish paper lining, which is an ablative material that helps to interrupt arcs at low currents (such as less than 100 amps). In history, fish paper was made of denim (cotton) fibers with a performance of up to 38kV. However, nowadays, fish paper is mainly made of wood pulp, and its performance is easily affected by dry atmospheric conditions. The use of wood pulp fibers damages the consistent low current arc interruption performance of distribution level fuse notches, such as 15, 27, and 38kV, because the arc extinguishing performance of these wood pulp fiber auxiliary tubes is more susceptible to atmospheric humidity conditions. When the humidity is low, the wood pulp fibers of the auxiliary tube are dry (lacking moisture). Having sufficient moisture content in the auxiliary pipe is important because during low liquid level faults, moisture will be converted into steam, which helps to extinguish the arc faster, i.e. in fewer cycles. When the auxiliary tube lacks sufficient water content, during low current faults, the fuse link will arc in additional phase cycles, resulting in poor interruption and arc suppression performance.

A laminate of kraft fiber (paper) sheets and a polymer film (preferably polyester film) is used to construct the fuse connection auxiliary tube. The inclusion of the polyester film layer facilitates arc quenching and improves the mechanical strength of the fuse-connecting auxiliary tube. The use of such fuse connection auxiliary tubing having a sandwich construction comprising a first layer of kraft paper, a layer of polyester film, and a second layer of kraft paper provides excellent interrupting performance for the ANSI C37.41-20008 table, series of tests, which is incorporated herein by reference for all purposes. The disintegration of the polyester film layer may include releasing moisture which cools the arc and contributes to the interruption of the current as well as generating a gas pressure which contributes to arc extinguishing. The polyester film layer also provides additional mechanical strength to the overall structural matrix of the fuse assist tube.
Kraft paper is a paper made from softwood chemical pulp processed by the sulfate method. It is strong and relatively coarse. The grammage is usually about 50-135 g/cm2.
Kraft paper is usually brown, but can be bleached to make white paper. It is used in grocery paper bags, multiwall bags, envelopes and other packaging . Preferably, the kraft paper used is a high dielectric strength kraft paper.

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