The present invention relates to an isolating/grounding switch with three phases in one enclosure, in particular to an isolating/grounding switch with three phases in one enclosure for a metal-enclosed gas-insulated switch device.
In a metal-enclosed gas-insulated switch device, an isolation function and a grounding function, and three operational positions, namely a connected position, an isolated position and a grounded position, are generally realized by opening and closing an isolating/grounding switch. These isolating/grounding switches can be broadly divided into two types, rotational and straight-moving. Of these, the rotational type is restricted by the manner of contact, and so the nominal current that it is capable of carrying is lower, while the electrical performance thereof is poorer. As a result, most high-load metal-enclosed gas-insulated switch devices employ straight-moving isolating/grounding switches. Chinese utility model 200820032556 has disclosed a straight-moving isolating/grounding switch of this type. Compared to the rotational type, the straight-moving type occupies more space. In addition, the three phase conductors must be joined as one in the isolating/grounding switch to achieve coordination with the drive mechanism, while it is also necessary to subject the housing to deformation processing in order that the various contacts are arranged in a straight line to accomplish switching.
The object of the present invention is to provide an isolating/grounding switch with three phases in one enclosure, which has a simple conductor shape and a higher space utilization rate. Such an isolating/grounding switch with three phases in one enclosure comprises a housing, three first conductors and three second conductors. The switch also comprises three first static contacts each connected to one of the first conductors, three second static contacts each connected to one of the second conductors, three moving contacts connected by an insulator, and three grounding contacts electrically connected to the housing. Each of the first static contacts and a corresponding one of the first conductors have the same axis as a corresponding one of the second static contacts and a corresponding one of the second conductors. Each of the moving contacts can slide on a corresponding one of the first conductors and is electrically connected to this first conductor. Each of the moving contacts is electrically connected to a corresponding one of the second static contacts when at one end of a corresponding one of the first conductors, and electrically connected to a corresponding one of the grounding contacts when at the other end of this first conductor. By establishing a direct electrical connection between each first static contact and a corresponding second static contact, there is no longer a need to join three conductors as one, and so a simple conductor shape and a higher space utilization rate are achieved. As a result of each of the first static contacts and a corresponding one of the first conductors having the same axis as a corresponding one of the second static contacts and a corresponding one of the second conductors, an electrical connection between the grounding contacts and the housing can be established simply, so that there is no need for the housing to undergo deformation processing. The above solution also allows a driving mechanism to have fewer components, so that the production costs of the switch are reduced while further improving the reliability thereof.
According to one embodiment of the present invention, the first conductors are arranged in a triangle on an insulating disk of the housing. The triangular arrangement helps to increase the space utilization rate and improve the insulating properties of the switch.
According to another embodiment of the present invention, the first conductors are arranged in a regular triangle on an insulating disk of the housing. The regular triangular arrangement can utilize space to the greatest extent possible, in order to achieve better insulating properties.
According to another embodiment of the present invention, the grounding contacts are three annular grounding contacts, each of the first conductors passing through a corresponding one of the grounding contacts, and the grounding contacts being electrically connected to the housing separately. By providing each of the first conductors with an independent grounding contact and connecting this to the housing, the connection between the grounding contacts and the housing, and the contact between the grounding contacts and the moving contacts, are made more reliable.
According to another embodiment of the present invention, the switch also comprises a crank arm, the crank arm being connected to the insulator and able to drive the moving contacts to slide on the first conductors. The provision of the crank arm helps to achieve the conversion of rotational movement of the driving mechanism to sliding movement of the moving contact in a simple manner.
According to another embodiment of the present invention, the second conductors are arranged in a regular triangle on the insulating disk of the housing, and at least one of the second conductors is bent. The bending of the second conductor helps to guarantee an insulating distance between the first static contacts and the second conductors in a limited space.
According to another embodiment of the present invention, only one of the second conductors is bent. When both the first conductors and the second conductors are arranged in a regular triangle on the insulating disk of the housing, disposing one of the second conductors close to the first conductor and bending the same helps to reduce the number of conductor processing steps and achieve a simpler structure.
According to another embodiment of the present invention, the housing is T-shaped and comprises a horizontal portion and a vertical portion, the first conductors being located in the horizontal portion, and the second conductors being located in the vertical portion.
According to another embodiment of the present invention, the housing is cross-shaped and comprises a horizontal portion and a vertical portion, the first conductors being located in the horizontal portion, and the second conductors being located in the vertical portion.
According to another embodiment of the present invention, the switch also comprises a driving mechanism connected to the crank arm, the driving mechanism being able to drive the crank arm and thereby drive the sliding movement of the moving contacts.
Preferred embodiments will be described below in a clear and easily understandable way with reference to the accompanying drawings, in order to further illustrate the above characteristics, technical features and advantages of the method used in the present invention, and embodiments thereof.
In order that the technical features, object and effects of the present invention may be more clearly understood, particular embodiments of the present invention will now be described with reference to the accompanying drawings, in which identical labels indicate identical components or components which are similar in structure but identical in function.
In order that the drawings may appear concise, only those parts which are relevant to the present invention are represented schematically in the drawings; they do not represent the actual structure thereof as a product. In addition, in order to make the drawings appear concise for ease of understanding, in the case of components with the same structure or function, in some drawings only one of these is drawn schematically, or only one is labeled.
The isolating/grounding switch with three phases in one enclosure of the present invention that is shown schematically in
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The series of detailed illustrations set forth above are merely specific illustrations of feasible embodiments of the present invention, and are by no means intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the artistic spirit of the present invention should be included within the scope of protection thereof.
Number | Date | Country | Kind |
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201210135013.0 | Apr 2012 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2013/057553 | 4/11/2013 | WO | 00 |