JPS5851425A - Disconnecting switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disconnect switch, and more particularly to a disconnect switch with a resistor that suppresses switching surges and is used in a gas-insulated closed substation using SFa gas as an insulating medium.

By opening and closing the power circuit with a disconnector, the charging current rushes into the busbar, equipment, and cables and is cut off. In this case, although it varies depending on the circuit conditions, a surge voltage nearly three times the maximum normal ground voltage peak value is generated. This surge can have a negative effect on the insulation within each device and on the insulation of low-voltage control circuits in substation equipment, so it is important to reduce the conosurge voltage as much as possible in order to improve insulation performance and reliability. It becomes. As a countermeasure to this problem, a method of inserting a resistor when opening and closing the disconnector has been considered, but the mounting position and fixing method of the resistor are problematic.

The purpose of the present invention is to provide a resistor-equipped disconnector that can be opened and closed via a resistor in order to suppress surge voltages that occur when the disconnector is opened and closed. Provide a disconnect switch.

In the present invention, as a method of attaching a plurality of resistors to a disconnector, a structure is adopted in which the resistors are integrally supported by arcing electrodes used at the longitudinal ends of the resistors. In addition, in order to fix the position of the electrode, a structure was adopted in which it was reinforced with a separate supporting insulator.

1 and 2 show an embodiment of the present invention. A main contact consisting of a fixed electrode 2 and a movable electrode 3 is configured in the ground tank 1, and is connected to other equipment via a current collector 4, a conductor 5, etc., respectively. In this proposal, a resistor 10 is placed on the fixed electrode 2 side.
are placed. The resistor 10 is composed of a plurality of resistive elements 20 arranged approximately concentrically around the stator 2, as shown in FIG. 2, from the viewpoint of insulation in the interpole direction and in the ground direction. These plurality of resistance elements 20 are integrally supported at their longitudinal ends by arcing electrodes 11 via bolts 12. In this structure, when the circuit is closed, the three movable electrodes are electrically connected to the fixed electrode 2 as shown by the broken line in the figure, but when the circuit is opened, the movable electrode moves to the right as shown by the arrow in the figure. do. At this time, an arc is generated at the tips of the fixed electrode 2 and movable electrode 3 in the initial stage, but when the movable electrode 3 is separated to a certain extent, an arc 13 is generated between the arcing electrode 11 and the movable electrode 3, as shown by the solid line in the figure. moves, resistor 1
It is cut off via 0. On the contrary, when the circuit is closed, electricity is first applied through the resistor 10, and then the fixed electrode 2 and the movable electrode 3 are connected. Such a structure makes it possible to significantly reduce opening/closing surges.

The resistance element 20 is usually made by firing resin or clay mixed with carbon, and the diameter is at most several tens of dragons.
It is about several hundred fins long. Therefore, in order to obtain the required resistance value and to alleviate the surface electric field of the resistor in one direction of the grounded tank, it was necessary to use multiple resistors in parallel, and this method of supporting and fixing was a problem. Since a firing electrode 11 is required at the longitudinal end of the body as shown in the figure, the structure can be simplified by V-type by using this electrode also as a support for the resistor.

The above description describes the basic method for attaching the resistor 100, but as described above, since the resistor element is a fired product, it does not have very good mechanical strength, especially bending properties. To compensate for this, a structure may be considered in which the structure is reinforced with an insulating material having excellent mechanical strength (for example, FRP or epoxy resin). Also, as the rated voltage increases,
Since the length of the resistor increases, it becomes difficult to fix the positions of the firing electrode 11 and the movable electrode 3.

FIG. 3 shows a case where these considerations are taken into consideration, and the firing electrode 11 is separately supported from the grounded tank 1 side by an insulating support 40 in the basic structure shown in FIG. By doing this, it is possible not only to reduce the mechanical stress applied to the resistor, but also to firmly fix the arc [4], which prevents positional changes with respect to the movable electrode 3. It is possible to provide an electrically and mechanically excellent disconnector.

4 to 7 are cross-sectional views taken along the line B--B in FIG. 1, showing a structure in which a reinforcing supporting insulator is provided in parallel with the resistance element.

FIG. 4 shows a case where an insulating rod 30, which is a reinforcing support insulator, is placed between the resistive elements 20, and no stress is applied to the resistive element 20 other than its own weight, and the mechanical strength of the resistive element is Improves reliability of power.

FIG. 5 shows a case where a large-diameter insulating tube 32 is used as a reinforcing support insulator. In the figure, a structure is shown in which a resistance element 20 is arranged inside a double insulating cylinder 32.

According to this structure, as in FIG. 4, the reliability of the resistance element against mechanical force is improved, and at the same time, it is possible to protect the resistance element from high-temperature gas caused by the arc generated when the resistance element is cut off.

FIG. 6 aims to achieve the same effect as FIG. 5, and in this case, the resistance elements 20 are each individually reinforced and supported by an insulating tube 32.

FIG. 7 shows a case where the resistance element 20 is formed hollow. Large-capacity resistance elements are often formed hollow due to their thermal characteristics, and in such cases, it is possible to arrange an insulating rod 34 for reinforcement and support inside the resistance element 20 as shown in the figure. be. When the number of parallel resistance elements increases, the overall diameter can be reduced unlike in FIG.

Note that these configurations can be used in combination, and a synergistic effect can be expected from each.

Moreover, although the above description is all about the case where the resistor is arranged on the fixed electrode side, it is also possible to apply the same to the case where the resistor is arranged on the movable electrode side.

As explained above, according to the present invention, it is possible to effectively support and fix a plurality of resistance elements used for reducing switching surges, and it is possible to extremely reduce the mechanical stress applied to the resistance elements. Yes, a long resistor is required1
It is possible to provide a highly reliable disconnector that prevents mechanical damage even for 00OKV power transmission.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a sectional view showing another embodiment of the invention, and FIGS. FIG. 7 is a sectional view of a main part showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Grounding tank, 2... Fixed electrode, 3... Movable electrode, 10... Resistor, 11... Arcing electrode, 20...
...Resistance element, 40...Insulating support, 30.32,3
3.34...Absolute figure 1, half 2, 3 figures

Claims (1)

[Claims] 1. A main contact consisting of a fixed electrode and a movable electrode is arranged in a grounding tank, and a resistor having an arcing electrode at the tip is provided around the main contact, and when the disconnector is closed, In the disconnector, the main contact is energized after the arc is fired between the movable element and the firing electrode and the resistor is energized, and the resistor is opened after the main contact is opened at the time of opening. As a configuration of the resistor, a plurality of resistive elements formed in a bar shape or a circular segment shape are arranged around the entire circumference or in an arc shape at required intervals so as to form a substantially concentric circle around the outer periphery of the main contact, and A disconnector characterized in that a plurality of resistive elements are integrally supported by the arcing electrode. 2. A disconnector according to claim 1, characterized in that a reinforcing insulator is separately provided in order to fix the position of the firing electrode that integrally supports a plurality of resistance elements. 3. The disconnector according to claim 2, wherein the reinforcing insulator is provided between the arcing electrode and the grounding tank. 4. The disconnector according to claim 2, wherein the reinforcing insulator is arranged parallel to the resistor.