JP2008021576A - Disconnector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a switching characteristic of a disconnector by cooling an arc in switching by hydrogen generated by the arc. <P>SOLUTION: This disconnector is provided with: a fixed-side current-carrying shaft 4 used as one-side circuit; a fixed-side contact 5 formed at an end of the fixed-side current-carrying shaft 4; a fixed-side arc connection part 6 arranged to surround the fixed-side contact 5; a moving-side current-carrying shaft 8 movably penetrating the fixed-side arc connection part 6, and used as the other-side circuit contacting to and separating from the fixed-side contact 5; a moving-side arc connection part 9 formed at an end of the moving-side current-carrying shaft 8, and arranged oppositely to the fixed-side arc connection part 6; and an operation mechanism connected to the moving-side current-carrying shaft 8. The disconnector is characterized by using a hydrogen storage alloy for the fixed-side arc connection part 6 and the moving-side arc connection part 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disconnector having a duty of switching such as a charging current and an exciting current of a power circuit, and more particularly to a disconnector capable of improving switching characteristics.

  Generally, the disconnector does not have the duty to open and close the current from the duty to open the power circuit. However, in reality, the charging current of the cable or the like, or the current such as the exciting current of the transformer may be switched.

For this reason, what is equipped with the opening-and-closing capability which sprays insulation gas on the arc generated at the time of circuit opening and forcibly extinguishes is known (for example, refer to patent documents 1). Others include those that apply a magnetic field to the arc to extend and cool the arc length, those that absorb the arc, and those that improve the switching speed.
Japanese Patent Laid-Open No. 7-249355 (3rd page, FIG. 1)

The above conventional disconnector has the following problems.
In order to extinguish the arc, the structure of blowing an insulating gas or applying a magnetic field is complicated, and the number of parts is increased and expensive.

  Therefore, there has been a demand for a disconnector having a simple structure that can reliably extinguish an arc generated when the charging current or exciting current is switched and improve the switching characteristics. Particularly in the disconnector, the improvement of the switching characteristics is an important factor because of the duty to open the power circuit.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a disconnector capable of cooling an arc with a metal material provided at a connection portion and improving switching characteristics.

  In order to achieve the above object, the disconnector of the present invention surrounds the fixed-side energizing shaft serving as one electric circuit, the fixed-side contact provided at the end of the fixed-side energizing shaft, and the fixed-side contact. A fixed-side arc connecting portion provided in the manner described above, a movable-side energizing shaft that movably penetrates the fixed-side arc connecting portion, and serves as the other electric path that contacts and separates from the fixed-side contactor, and the movable-side energizing A movable-side arc connecting portion provided at a shaft end and disposed opposite to the fixed-side arc connecting portion; and an operation mechanism coupled to the movable-side energizing shaft, the fixed-side arc connecting portion and the movable-side A hydrogen storage alloy is used for the arc connection part.

  According to the present invention, since the hydrogen storage alloy having the property of taking in hydrogen is used for the connection part of the current-carrying shaft, hydrogen is released by the arc generated when the current is opened and closed such as the charging current and the excitation current, and the arc is cooled. The open / close characteristics can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the disconnector according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view illustrating a configuration of a disconnector according to Embodiment 1 of the present invention, and FIG. 2 is a diagram illustrating arc extinguishing of the disconnector according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a fixed-side fixing member 2 and a movable-side fixing member 3 are fixed to both ends of a cylindrical insulating container 1 made of an insulating material such as an epoxy resin containing glass fiber.

  The fixed-side fixing member 2 has a fixed-side energizing shaft 4 that penetrates and is fixed to one electric path. The end of the fixed energizing shaft 4 in the insulating container 1 is provided with a recessed portion 4a having a recessed central portion, and a copper fixed side contact 5 in which a plurality of finger-shaped contacts are assembled in an annular shape on the outer periphery thereof. ing. A cylindrical arc ring 6 that surrounds the stationary contact 5 and protrudes further toward the movable stationary member 3 than the stationary contact 5 is fixed to the end of the stationary energizing shaft 4. The arc ring 6 is an alloy made of a metal material such as nickel, titanium, or zinc, and is made of a hydrogen storage alloy having a property of taking in hydrogen.

  On the inner surface of the arc ring 6, there is provided an annular convex portion 6 a that clamps and fixes the stationary contact 5 with the stepped portion at the end of the stationary energizing shaft 4. In addition, a fixed-side electric field relaxation shield 7 that fixes an electric field at the end of the fixed-side energizing shaft 4 is fixed to the outer periphery of the arc ring 6.

  The movable side fixing member 3 is movably penetrated by a movable side energizing shaft 8 which is the other electric circuit coupled to an operation mechanism (not shown). An arc contact 9 having a recessed central portion and a projecting outer peripheral portion is fixed to the end of the movable energizing shaft 8 in the insulating container 1 and is disposed opposite the fixed contact 5. The arc contact 9 is made of a hydrogen storage alloy of an alloy made of the same metal material as the arc ring 6.

  At the time of connection, the arc contact 9 is fitted into the recess 4a. When fitted into the recess 4a, the outer peripheral surface of the movable energizing shaft 8 comes into contact with the fixed contact 5 so that normal energization can be performed. That is, the movable-side energizing shaft 8 passes through the arc ring 6 so as to be movable, and its outer peripheral surface is in contact with and away from the fixed-side contactor 5.

  A movable-side electric field relaxation shield 10 that serves both for energization and electric field relaxation is fixed to the movable-side fixed member 3 on the outer periphery of the movable-side conductive shaft 8. Between the movable-side electric field relaxation shield 10 and the movable-side conductive shaft 8, there is provided a movable-side contact 11 in which finger-shaped contacts are assembled in an annular shape. Insulating container 1 may be filled with dry air, nitrogen gas, or the like, but general air may be circulated through a filter or the like.

  Next, the movement of the arc when this disconnector is opened will be described.

  As shown in FIG. 2A, when the movable side energizing shaft 8 is pulled out from the fixed side contactor 5 in the illustrated arrow direction, an arc 21 is generated between the fixed side contactor 5 and the tip of the arc contact 9. When the movable side energizing shaft 8 is further pulled out, as shown in FIG. 2B, the arc 21 is stretched and the arc 21 is also generated between the convex portion 6 a of the arc ring 6 and the arc contact 9. Since the convex portion 6a is relatively easy to cause electric field concentration, the arc 21 is easily generated.

  When the movable side energizing shaft 8 is further pulled out, the arc 21 is stretched as shown in FIG. When the movable side energizing shaft 8 is pulled out to a predetermined insulation distance, the arc 21 is cooled and extinguished.

  Here, since the arc ring 6 and the arc contact 9 are made of a hydrogen storage alloy, when they are exposed to the arc 21, they are dissolved and hydrogen is released. Since hydrogen has a high thermal conductivity, the arc 21 is cooled. As a result, the arc 21 can be quickly extinguished.

  Since such an arc ring 6 becomes a connection part exposed to the arc 21 on the fixed side, it is defined as a fixed-side arc connection part. Similarly, the arc contact 9 is a connection portion exposed to the arc 21 on the movable side, and is therefore defined as a movable-side arc connection portion.

  Using a disconnector equipped with an arc ring 6 and an arc contact 9 made of copper-nickel alloy or copper-zinc alloy, an open / close test of a charging current 1A with a circuit voltage of 66 kV and an excitation current 5A revealed that the switch could open and close without problems. did it. In a general disconnector that does not use the arc ring 6 and the arc contact 9, the arc could not be extinguished in the open / close test under the above conditions.

  According to the disconnector of the first embodiment, hydrogen is connected to the fixed-side arc connecting portion formed by the arc ring 6 at the fixed-side energized shaft 4 end and the movable-side arc connecting portion formed from the arc contact 9 at the end of the movable-side energized shaft 8. Is used, the hydrogen is released from the hydrogen storage alloy by being exposed to the arc 21 generated at the time of current switching such as a charging current and an excitation current, and the arc 21 is cooled and quickly. The arc can be extinguished to improve the open / close characteristics.

  Next, a disconnector according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view illustrating the configuration of the disconnector according to Embodiment 2 of the present invention. The difference between the second embodiment and the first embodiment is the shape of the fixed shield. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, an arc made of a hydrogen storage alloy is provided around the fixed-side energizing shaft 4 via the fixed-side shield fixing member 31, which serves to both relax the electric field at the end of the fixed-side energized shaft 4 and improve the open / close characteristics. The shield 32 is fixed. An annular convex portion 32a is provided on the inner surface.

  As a result, when the movable side energizing shaft 8 is pulled out from the stationary contact 5, an arc 21 is generated between the stationary contact 5 and the arc contact 9. When the protrusion 32a is further pulled out, the electric field concentration is relatively easily caused in the convex portion 32a, and the arc 21 moves to the convex portion 32a. And if the convex part 32a is exposed to the arc 21, hydrogen will be discharge | released and the arc 21 will be cooled.

  Here, the arc shield 32 is defined as a fixed-side arc connecting portion because it is a fixed-side connecting portion exposed to the arc 21 as in the first embodiment.

  According to the disconnector of the second embodiment, the same effect as that of the first embodiment can be obtained.

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the summary of invention, it can implement in various deformation | transformation. In the above embodiment, the fixed side contactor 5 is made of copper. However, when the energizing current of the disconnector is small or has a sufficient energizing capacity, the fixed side contactor 5 itself is made of a hydrogen storage alloy. May be. In this case, since the arc 21 is generated from the stationary contact 5 immediately after the separation, hydrogen is released from the stationary contact 5 and the open / close characteristics can be improved.

  Furthermore, for example, when the rated voltage is 6 kV and the use voltage is low, the electric field relaxation shields 7 and 10 for electric field relaxation are not necessary. In this case, even if only the stationary contact 5 is made of a hydrogen storage alloy, the arc contact 9 is removed, and even when the movable side energizing shaft 8 is brought into and out of contact with the stationary contact 5, hydrogen is released by the arc 21 and the opening / closing characteristics are improved. Can be improved.

Sectional drawing which shows the structure of the disconnector which concerns on Example 1 of this invention. The figure explaining arc extinction of the arc of the disconnector concerning Example 1 of the present invention. Sectional drawing which shows the structure of the disconnector which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insulation container 2 Fixed side fixed member 3 Movable side fixed member 4 Fixed side energizing shaft 4a Recessed part 5 Fixed side contactor 6 Arc ring 6a, 32a Convex part 7 Fixed side electric field relaxation shield 8 Movable side energized shaft 9 Arc contact 10 Movable side Electric field relaxation shield 11 Movable contact 21 Arc 31 Fixed shield fixing member 32 Arc shield

Claims (5)

A fixed-side energizing shaft that is one of the electrical paths;
A stationary contact provided at the stationary energizing shaft end;
A fixed-side arc connection provided to surround the fixed-side contact;
A movable-side energizing shaft that penetrates the fixed-side arc connecting portion movably and serves as the other electric path that contacts and separates from the fixed-side contact;
A movable side arc connecting portion provided at the movable side energizing shaft end and disposed opposite to the fixed side arc connecting portion;
An operation mechanism coupled to the movable side energization shaft,
A disconnector using a hydrogen storage alloy for the fixed-side arc connecting portion and the movable-side arc connecting portion.   The disconnector according to claim 1, wherein a convex portion is provided on an inner surface of the fixed-side arc connection portion.   The disconnector according to claim 1 or 2, wherein the hydrogen storage alloy is used for the stationary contact.   The disconnector according to any one of claims 1 to 3, wherein the hydrogen storage alloy is a copper-nickel alloy. A fixed-side energizing shaft that is one of the electrical paths;
A stationary contact made of a hydrogen storage alloy provided at the stationary energizing shaft end;
A movable-side energizing shaft serving as the other electrical path that contacts and separates from the stationary contact;
A disconnector comprising: an operating mechanism coupled to the movable side energizing shaft.

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