JPS6254221B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a substantially tubular container through which a connecting conductor passes through its cylindrical jacket surface, and the connecting conductor is disposed within the container on or parallel to the axis. A gas for power use, which forms a U-shaped current-carrying path with a contact system that forms a break gap, and is equipped with a correction device that acts to cancel the Lorentz force of the current-carrying path that acts on the arc when the contact system breaks. Involved in cutting equipment. As shown in Figure 1, the arc generated in the gap is stretched in the opposite direction to the direction in which the U-shape opens due to the Lorentz force acting under the action of the magnetic field B created by the U-shaped current-carrying path. , there is a risk that the arc extinguishing ability of the arc extinguishing means provided in the gap may deviate from the range beyond which the arc extinguishing ability can reach. The short-circuit current capacity of the gas shield circuit breaker, in which the magnetic field generated in the U-shaped current path and acting on the arc from one side is corrected, increases the short-circuit current capacity. Although it is known to provide contact systems of power gas insulators and disconnectors with current-dependent ferromagnetic materials, known correction devices are arranged within the contact systems themselves.

For example, from West German Patent Application Publication No. 2626245 (corresponding to Japanese Unexamined Patent Publication No. 53-10867), a contact configuration of a gas shear disconnector having a nozzle-shaped arc electrode is known, and the process of shearing operation is known. At , the arc is drawn into the arc electrode. The arc electrode forms a rotating generating body with a U-shaped cross-section, with a cavity accommodating the ring formed between the legs of the U-shape. This ring is made of ferromagnetic material that is magnetized by the arc's magnetic field and generates a force in the direction of the nozzle axis. Even if this type of contact configuration is employed in power gas shields and disconnectors of the type mentioned at the outset, the forces acting on the arc produced by the U-shaped current path are not sufficiently compensated for. This is because, on the one hand, this force acts on the arc from one side, and on the other hand, the size of the ferromagnetic body determined by the dimensions given by the contact system turns out to be too small.

West German Patent Publication No. 2815136 (Japan, JP-A-Sho
54-136665), a ferromagnetic material filling only a portion of the circumference of the cavity produces a better effect. The size of known ferromagnetic materials is also limited by the geometry of the contact arrangement, so that in some cases they are not sufficiently effective, especially in the case of high currents.

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure that can enhance the effect of a correction device in a power gas shield or disconnector, particularly a puffer type disconnector, and can cut off a large short-circuit current.

This purpose, according to the invention, is such that the correction device
consisting of an electrically conductive material capable of forming a shorting ring arranged parallel to the plane containing the U-shaped current carrying path and over the contact system and carrying an induced current around an axis perpendicular to said plane and passing through the contact system; This is achieved by being composed of a yahei body.

A shield made of conductive material placed parallel to the plane containing the U-shaped current path and over the contact system has a U-shaped current path, as typically shown by the symbol 〓 in Figure 1. The magnetic flux generated by the current flowing through the electrical path penetrates. If the shield body is able to form a closed circuit or short ring around the magnetic flux, this magnetic flux causes an induced current to flow, producing a magnetic flux that cancels this magnetic flux according to Lenz's law. As a result, the electrode gap where the arc is blown is almost shielded from the external magnetic field.

The shield body is preferably formed into a cylindrical shape and coaxially and rigidly fixed to an insulating tube surrounding the contact system.

In a further advantageous embodiment, the shield body is formed in the shape of a curved saddle extending parallel to the axis of the contact system and is placed on the insulating tube facing the plane containing the U-shaped current path. is advantageous.

In all embodiments, it is advantageous for the shielding body to cover at least the electrode gap of the contact system in order to dampen the magnetic field acting on the arc.

Next, an embodiment of the apparatus according to the present invention will be described based on the drawings, and its operation will be explained.

FIG. 1 is a schematic cross-sectional view including a U-shaped current carrying path of a power gas shield disconnector having a tubular metal container, and FIG. 2 is a contact point of the shield disconnector according to FIG. 1 having a correction device according to the present invention. FIG. 2 is an axial cross-sectional view of the system.

FIG. 1 shows a simplified diagram of a power disconnector filled with SF6 as an arc-extinguishing and insulating medium at a pressure of about 4 bar, for example for a voltage of 110 KV and having a tubular metal container 1. There is. The connecting conductors 2, 3 of the shield breaker pass through the cylindrical jacket surface 6 of the metal container 1 by means of bushings 4, 5. The metal container 1 generally consists of a magnetized material such as steel.

Under the influence of the short-circuit current I flowing through the connecting conductors 2, 3 of the breaker, the U-shaped current-carrying paths 7, 7a, 7
b, 7c, a magnetic field is generated, possibly amplified by the metal container 1, which undesirably prevents the arcing that occurs during the shearing operation into the contact system 9.
distract from In order to compensate for the Lorentz forces resulting from the current density J and the magnetic flux density B, a shield body 10 is provided, as shown in FIG. . In the embodiment shown, the shield body 10 is placed on an insulating tube surrounding the contact system. The shield body 10 is coaxially and firmly fixed on the insulating tube 11 so as to cover the electrode gap 9a and the portion of the contact system 9 adjacent thereto.

As an alternative to the embodiment shown in FIG. 2, a curved saddle-shaped shield extending parallel to the axis of the contact system can also be arranged on the insulating tube 11. In this case it is advantageous for the two saddle shapes to be placed opposite each other in the plane containing the U-shaped current path. In both cases a corrective magnetic field is created, leading to stabilization of the arc before the extinction action begins.

Instead of the metal container described above, a container made of non-metallic material can be used.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a power gas shield and disconnector having a tubular metal container, including a U-shaped current carrying path, and FIG. 3 is an axial cross-sectional view of the contact system of the disconnector; FIG. In the drawing, 1 is a metal container, 2 and 3 are connection conductors, 4 and 5 are bushings, 6 is a cylindrical outer covering surface of the metal container, 7, 7a, 7b, and 7c are U-shaped current carrying paths, and 9
9 is a contact system, 9a is an electrode gap, 10 is a shield body, and 11 is an insulating tube.

Claims (1)

[Scope of Claims] 1. A device having a substantially tubular container in which the connecting conductor passes through its cylindrical jacket surface, and the connecting conductor is disposed within the container on the axis or parallel to the axis to form a gap. A power gas shield disconnector that forms a U-shaped current-carrying path with a contact system that acts on the current-carrying circuit, and is equipped with a correction device that acts to cancel the Lorentz force of the current-carrying path that acts on the arc when the contact system breaks. wherein the correction device forms a shorting ring arranged parallel to a plane containing the U-shaped current carrying path and over the contact system and carrying an induced current around an axis perpendicular to the plane and passing through the contact system. 1. A gas shield disconnector for electric power, characterized in that it is constituted by a shield body made of a conductive material. 2. The device according to claim 1, characterized in that the shield body is formed into a cylindrical body and coaxially and firmly fixed on an insulating tube surrounding the contact system. Gas cutter. 3. The device according to claim 1, characterized in that the shield body is formed in the shape of a saddle and is arranged parallel to the axis of the contact system on an insulating cylinder surrounding the contact system. Gas disconnector for electric power.