JPS6340334B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disconnection switch for disconnecting the load current or excitation current of a transformer in order to disconnect the transformer from or connect it to the line in a power system.

Conventionally, this type of switch has been used as a power switch or disconnector for the purpose of suppressing fault current, or as a switch for providing current flow or disconnection capability to a disconnector that opens and closes a line in a no-current state. These devices were equipped with a spring operating mechanism, making them complex and expensive.

The present invention is configured so that the spring force that presses the movable contact against the fixed contact for energization can be used as the contact opening force, thereby simplifying the current collector from the movable contact and making it possible to cut the arc at two points in series. With this configuration, an inexpensive and highly reliable disconnection switch is provided.

The figures will be explained below. In Figures 1 and 2, 1 is a fixed output contact connected to a transformer output terminal, etc., 2 is a fixed current collector contact connected to a bus bar, etc., and 3 is fixed output contact 1 or fixed current collector contact 2.
4 is a rotation bearing of the movable contact 3, 5 is a holding arm of the movable contact 3,
A rotary bearing 4 is fixed, and the movable contact 3 is loosely inserted around the rotary bearing 4 so as to be freely rotatable. 6 is a movable contact drive arm fixed to the holding arm 5;
Reference numeral 7 indicates a main shaft into which a movable contact drive arm 6 is slidably loosely inserted in the radial direction, and drives the movable contact drive arm 6 by a power source (not shown); 8 indicates a movable contact 3 between the holding arm 5 and the main shaft 7; Fixed contact 1,
A push spring 9 is inserted in the direction of pressing the movable contact 3 from the fixed contacts 1 and 2, that is, when the movable contact drive arm 6 is in the open state, the movable contact drive arm 6 is inserted in the direction of pushing the movable contact drive arm 6 to prevent the main shaft 7 from jumping out. A stopper 10 attached to the terminal electrically connects the stopper 9 on the output fixed contact 1 side and the stopper 9 on the current collection fixed contact 2 side, and allows the movable contact drive arms 6 on each side to move independently of each other. 11 is an arc barrier provided between the output fixed contact 1 and the current collection fixed contact 2, 12 is an operating shaft connected to a drive source (not shown), and 13 is an operating shaft of the operating shaft 12. A coupling cam provided at the end portion forms a protrusion 14 at an appropriate angle in the radial direction of the operating shaft 12 and the concentric disk.

15 is a coupling fixed to the end of the main shaft 7; 16 is fitted inside the coupling 15 concentrically and rotatably with the coupling cam 13, and can be connected to the protrusion 14 with a predetermined play in the rotational direction. The cam hole configured as such, 17 is the rotational play angle between the projection 14 and the cam hole 16.

Next, the operation of the disconnection switch according to the present invention will be explained with reference to the drawings.

Current from a transformer output terminal (not shown) is output from fixed contact - movable contact 3 - rotation bearing 4 - roller holding arm 5 - movable contact drive arm 6 - stopper 9 -
Electricity is supplied through the path of flexible conductor 10 - movable contact drive arm 6 - roller holding arm 5 - rotation bearing 4 - movable contact 3 - current collecting fixed contact 2. Now, when a rotational force is transmitted to break the above path, the coupling cam 13 rotates, and the operating shaft 12 idles until the protrusion 14 loses play with the cam hole 16, and the protrusion 14 comes into contact with the cam hole 16. After that, the rotational force is transmitted to the main shaft 7. When the main shaft 7 rotates counterclockwise, the movable contact 3 is driven to the position shown by the broken line in FIG. When the movable contact 3 is in the normal position in the energized state, all of the force P of the push spring 8 becomes the contact force between the movable contact 3 and the fixed contacts 1 and 2; When the contact spring 8 is moved toward and away from the contact point (the position indicated by the broken line in FIG. 1), the force P of the pressing spring 8 appears divided into a contact contact force Q and a force F that drives the movable contact 3, as shown in FIG.

The reason for this is that the contact points of the output fixed contact 1 and the current collection fixed contact 2 with the movable contact 3 are shaped to be the same as the driven radius of the movable contact 3 in the energized fixed position, and are parallel to the central axis of the main shaft 7 in the open position. This is because it is molded on a flat surface.

After the movable contact 3 is accelerated counterclockwise by the contact opening force F, it opens and opens at a speed determined dynamically by the inertia and frictional force of the rotating system.

At this time, the specifications of the dynamic system may be selected so that the revolution speed of the movable contact 3 becomes a necessary value depending on the surrounding medium (for example, insulating oil) and the voltage and current.

According to the present invention, when the contacts open, the arc is broken at two points in series between the output fixed contact and the movable contact and between the current collection fixed contact and the movable contact, so that the arc extinguishing force increases. Since the movable contact rotates when it opens and separates from the fixed contact, the arc extinguishing ability is increased because the foot of the generated arc is always transferred to a new cold surface. In addition, the output fixed contact and the current collection fixed contact are mounted on the same support frame, the pair of movable contacts are configured to contact and release each fixed contact, and a barrier is used to partition the pair of fixed contacts. Therefore, the fixed contacts will not be short-circuited due to arcing. Even if the arc continues until the movable contact stops, as long as the separation distance between the movable contact and the fixed contact is sufficient, there is a high possibility that the arc will eventually be extinguished, improving reliability.

Further, by adopting the above structure, current collection from the movable part can be easily performed with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The figure is a cross-sectional view taken along the line -- including a partial perspective view of FIG. In the figure, 1 and 2 are fixed contacts, 3 is a movable contact, 6 is a drive arm, 7 is a main shaft, 8 is a spring, and 10
is a flexible conductor. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A main shaft that is rotatably driven, a pair of drive arms supported by this main shaft and movable a predetermined distance in a direction substantially perpendicular to the center line of the main shaft, and a pair of drive arms that are freely rotatable approximately parallel to the center line of the main shaft. a pair of supported movable contacts, a spring that presses each of the drive arms in a direction that moves each of the movable contacts away from the centerline of the main shaft;
A flexible conductor connected between the two driving arms, a contact surface on which each of the conductive contacts can roll at a predetermined radius from the center line of the main shaft against the spring, and a contact surface that allows the contact surface to roll at a predetermined radius from the center line of the main shaft. A disconnecting switch having a pair of fixed contacts having a disengagement surface at a long distance from the disconnection surface.