ES2557955B1 - Eject fuse circuit breaker - Google Patents

Abstract

Eject fuse circuit breaker comprising a base which in turn comprises a fiberglass bar and a metal support arm fixed thereto by means of a clamp, in which the bar and the clamp are made of boron-free glass fiber, the fixing of the clamp to the bar is by bonding with resin by means of filament winding.

Description

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EXPULSION FUSE SHORT CIRCUITS DESCRIPTION

OBJECT OF THE INVENTION

The present invention is encompassed in the field of fuse ejector circuit breakers.

Said invention is a fuse ejector circuit breaker comprising a base which in turn comprises a fiberglass bar and a metal support arm fixed thereto by means of a clamp so that the circuit breaker complies with IEC 602828-2 and IEC standards 61109.

BACKGROUND OF THE INVENTION

The ejection circuit breakers are used by the electric comparator distributors in medium voltage installations, and are usually placed on medium voltage distribution turrets when it is intended to derive a line to service a transformer center or any other receiving element.

The circuit breakers are unipolar devices, therefore placing one for each phase. The base of the ejection circuit breaker is the insulating element on which the fuse holder is placed, which is responsible for protecting the supply line against short circuits.

Until a few years ago the bases of the ejection circuit breakers were mainly ceramic given the good properties of these materials to achieve adequate insulation. A support arm was incorporated over the center of said bases, which allows the attachment of the circuit breaker base to the support structure or to the distribution turret. Said arm must be metallic because it must be grounded.

The use of ceramic materials presented several disadvantages: weight, fragility, difficulties of assembly and transport, and high cost.

For all the above, various manufacturers advanced towards a non-ceramic, but polymeric, insulation system, in order to overcome the above-mentioned difficulties.

In general, during the last decade, the equipment installed in electrical distribution networks has evolved towards the widespread use of polymeric insulation, thus gaining maneuverability, lightness, and ease of maintenance with respect to ceramic insulation systems.

But, for various reasons, all manufacturers on the market include a "hidden" metal part under the base polymer that constitutes a point electrically grounded, as in WO02 / 15212. This constructive style induces a distortion of the electromagnetic field associated with the application of voltage pulses, such that said pulses cannot contour outside the insulation (as they should do according to the standard), but are forced to penetrate between the polymeric insulation and the fiberglass bar on which said insulation is bonded. This phenomenon punctures the insulation of the base and, ultimately, causes it to fail in the tests provided for in the mandatory international standards IEC 602828-2 and IEC 61109.

Thus, the present invention of a circuit breaker that overcomes the aforementioned disadvantages and covers the exposed need to overcome the international mandatory standards IEC 602828-2 and IEC 61109 is exposed.

DESCRIPTION OF THE INVENTION

The present invention is established and characterized in the independent claims, while the dependent claims describe other features thereof.

The object of the invention is an ejector fuse circuit breaker comprising a base which in turn comprises a fiberglass bar and a metal support arm fixed thereto by means of a clamp so that the circuit breaker complies with the iEc 602828- standards. 2 and IEC 61109. The technical problem to be solved is to configure a circuit breaker in disposition of components and materials to reach the mentioned object.

In view of the foregoing, the present invention relates to a fuse ejector circuit breaker comprising a base which in turn comprises a fiberglass rod and a metal support arm fixed thereto by means of a clamp.

It characterizes the circuit breaker that the bar and clamp are made of boron-free fiberglass, which is normally of ECR quality (electrical acronym for “Electrical and Chemical Resistant”), that is, quality that provides electrical and chemical resistance.

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The circuit breaker is also characterized in that the fixing of the clamp to the bar is by bonding with resin and said bonding is carried out by means of filament winding ("Philament Winding" according to its English name), a known manufacturing technique using impregnated fiberglass filaments in resin and wrapping the desired part with them, for example, deposits and cylindrical housings are made for many applications.

The circuit breaker complies with IEC 602828-2 and IEC 61109 standards, also called “hardware and interface testing”. It is necessary to underline that this test is carried out in full, that is, on the complete circuit breaker and not only on one of the parts that compose it, such as the base bar. Likewise, it is noteworthy that the described configuration allows this test to be overcome using usual circuit breaker fittings and insulations, since the fixing of the clamp helps prevent the contouring of the current between the base and the support arm avoiding the steep front that occurs in other circuit breakers and, mainly, does not comply with the aforementioned standards.

Advantageously, the support arm is fixed in the center of the bar, so that both the mechanical stresses and the electrical stresses to be supported are equally distributed on both sides of the bar. Specifically, the relationship between the distance Y from the end of the bar to its center and the width X of the clamp from said center is checked as optimal meets the relationship 0.09Y <X <0.33Y.

Optionally, a thickness E of the clamp commonly used is between 7.5 and 23.5 mm.

DESCRIPTION OF THE FIGURES

The present specification is complemented by a set of figures, illustrative of the preferred example, and never limiting the invention.

Figure 1 represents a profile view of the circuit breaker of the invention.

Figure 2 represents a profile view of the circuit breaker base.

DETAILED EXHIBITION OF THE INVENTION

Next, an embodiment of the invention is set forth with support in the figures.

Figure 1 shows a fuse ejector circuit breaker with the usual components such as a base (1) held by hardware or jaws (3) and wrapped by a polymeric insulator (2).

Figure 2 shows the base (1) which in turn comprises a fiberglass rod (1.1) and a metal support arm (1.2) fixed thereto by means of a clamp (1.3), in which the bar (1.1) and the clamp (1.3) are made of boron-free fiberglass, for example of ECR quality, the fixing of the clamp (1.3) to the bar (1.1) is by bonding with resin by means of filament winding, so The circuit breaker complies with IEC 602828-2 and IEC 61109 standards.

Advantageously, the support arm (1.2) is fixed in the center of the bar (1.1), as shown in Figures 1 and 2.

In particular, it is preferred that the relationship between the distance Y from the end of the bar (1.1) to its center and the width X of the clamp (1.3) from said center meets the relationship 0.09Y <X <0.33Y. Optionally, the thickness E of the clamp (1.3) is between 7.5 and 23.5 mm.

Claims (3)

ES 2 557 955 A1 1.-Ejecting fuse circuit breaker comprising a base (1) which in turn comprises a fiberglass rod (1.1) and a metal support arm (1.2) fixed thereto by means of a clamp (1.3) 5 characterized in that the bar (1.1) and the clamp (1.3) are made of boron-free fiberglass, the clamp (1.3) is attached to the bar (1.1) by resin bonding by means of filament winding. 2. - Short circuits according to claim 1 wherein the support arm (1.2) is fixed in the center of the bar (1.1). 10 3.-Circuit breaker according to claim 2 wherein the relationship between the distance Y from the end of the bar (1.1) to its center and the width X of the clamp (1.3) from said center meets the relationship 0.09Y <X <0.33Y. 4.-Circuit breaker according to any of the preceding claims wherein the thickness E of the clamp 15 (1.3) is between 7.5 and 23.5 mm.