JPS62225115A - Gas insulated switchgear - 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 "Field of Industrial Application" The present invention relates to a gas insulated switchgear used in substations and the like.

"Conventional technology" Cables are increasingly being used for power transmission lines as the application of gas-insulated switchgears in substations expands.
If the cable is directly grounded with a residual charge, the rapid movement of charge will generate a reciprocating surge in the cable core, and the induced surge may cause dielectric breakdown of the cable's anti-corrosion layer. For this reason, a resistive earthing switch is often used on the cable side, which discharges the cable's residual charge through a resistor and then connects it directly to the ground.

Figures 4 and 5 show this type of gas insulated switchgear (hereinafter referred to as G
This is a plan view and a front view showing a conventional example of IS.
The figure is a single line diagram.

GIS can connect cable connection parts 1, voltage transformers 2, line disconnectors 3, resistive earthing switches 4, circuit breakers 5, busbar disconnectors 6, etc. for each device or for multiple devices at once. It is stored in a cylindrical container and contains SF6 gas and S, which have excellent insulation properties.
It is insulated with an insulating medium such as F6 mixed gas. The grounding switch 4 with a resistor is arranged between the line disconnector 3 and the cable connecting part 1, and the grounding contact part 7 and the grounding contact part 8 with a resistor are placed between the main conductor 9 in a direction perpendicular to the floor surface. arranged in series. Roughly speaking, the drive mechanism section 10 of the line disconnector 3 is arranged on one side of the cylindrical container of the line disconnector 3 with respect to the main conductor 9 located approximately at the center of the cylindrical container.

"Problems to be Solved by the Invention" In the conventional grounding switch with resistance 4, the grounding contact part 7 and the grounding contact part 8 with resistance are arranged in series in a direction perpendicular to the floor surface. The large size of the container 4 not only increases the space of the equipment but also impairs economic efficiency.
Since the direct grounding contact section 7 and the resistive grounding contact section 8 are arranged at both ends of the container with the main conductor 9 in between, they have to be configured as a single device, and the line disconnector 3 and the cable connection section 1
Since the resistor-equipped earthing switch 4 is separately installed between the two, the installation area of the entire device becomes large. Furthermore, a put space is created below the resistor-equipped earthing switch 4, which further increases the size of the entire GIS.

"Means to solve problems" In developing the present invention, we focused on the following two points.

Firstly, in GIS, one line is generally configured as one unit, and each unit is placed in parallel. However, in order to be able to separate and connect each line, it is possible to attach and detach the units to the bus bar that connects the lines. equipment is provided. In other words, there is a space between each line for separating the line units and attaching/detaching the connections, and the attaching/disconnecting operations are performed at the bus bar between the lines. In other words, a space that is not normally used is provided in the busbar portion between the lines. The second point to note is that the drive mechanism that operates the line disconnector is located on one side of the cylindrical container with respect to the main conductor located approximately in the middle of the cylindrical container of the disconnector, and the opposite side is empty. The point is that it is a space. First, the drive mechanism of the line disconnector is arranged parallel to the floor and perpendicular to the main conductor, that is, in the inter-line direction. Next, in the same container as the disconnector, the drive mechanism of the resistor-equipped earthing switch is arranged in the line-to-line direction on the opposite side of the drive mechanism of the line disconnector with respect to the main conductor, and configured as a composite switch. do. However, as it is, the resistive grounding contact and the direct grounding contact of the resistive earthing switch are arranged so as to pass through the main conductor, so they will be located in the same part as the drive mechanism of the line disconnector. Cannot be configured. Therefore, the resistive grounding contact portion and the direct grounding contact portion of the resistive earthing switch are arranged in one direction perpendicular to the main conductor, opposite to the drive mechanism portion of the line disconnector. The means will be explained in detail in Examples.

``Example'' Figure 1 is a plan view showing an example of a GIS to which a composite switch configured by integrating a line disconnector and a resistive earthing switch according to the present invention is applied, and Figure 2 is a front view thereof. be. Note that the single-line connection diagram is the same as FIG. 6 showing the conventional example, so it will be omitted. In each figure, 1 is a cable connection part connected to an external electric wire, 2 is a voltage transformer, 11 is a composite switch of a line disconnector and a resistor-equipped earthing switch according to the present invention, 5 is a circuit breaker,
6 is a disconnect switch for both buses A and B, which is installed between the buses that connect the lines. Note that the same parts as in the conventional example are given the same reference numerals. The composite switch 11 has the drive mechanism section 13 of the line disconnector 12 parallel to the floor and the main conductor 1
4, that is, in the line-to-line direction, and the drive mechanism section 16 of the resistor-equipped earthing switch 15 is disposed on the opposite side of the drive mechanism section 13 with respect to the main conductor 14. The resistive ground contact portion 17 and the direct ground contact portion 18 are arranged in one direction perpendicular to the main conductor 14. Next, details of the composite switch 11 will be explained with reference to FIG. The line disconnector 12 operates the movable contact 21 via the insulated operating rod 20 connected to the drive mechanism part 13 by the operating device 19, and connects and separates it from the fixed contact part 22 to connect and disconnect the circuit. Perform separation. Drive mechanism section 13 and insulated operating rod 20
are arranged in one direction perpendicular to the main conductor 14. The operating device 19 is placed at any position near the drive mechanism section 13. The grounding switch 15 with resistance is connected to the ground by operating the movable contact 25 via the insulated operating rod 24 connected to the drive mechanism section 16 by the operating device 23, and connecting and separating it from the fixed contact. This connects and separates the grounding circuit from the GIs, but in constructing the grounding circuit, the residual charge of the cable connected to this GIs is first removed by resistor 2.
It must be discharged through 6. Therefore, the movable contact 25 of the earthing switch 15 with resistance is made into a two-stage structure consisting of a first contact 27 and a second contact 28. During the grounding operation, the first contact 27 is first connected to the fixed contact attached to the main conductor 14. The main conductor 14→
Fixed contact part 29 → first contact 27 → resistance ground contact part 17
→Resistor 26→Discharge to the ground via the resistor 26 and the grounding plate 30 directly connected to the grounding contact portion 18. At this time, since the surge is suppressed by the resistor 26, the current can be safely supplied without generating abnormal voltage. Second contact 28 and direct ground contact portion 18 then come into contact. Thereafter, the ground current is discharged to the ground via the main conductor 14 -> the first contact 27 -> the resistive ground contact section 17 -> the second contact 28 -> the direct ground contact section 18 -> the ground plate 30 . In addition, at this time,
Surges rarely occur because most of the cable residual charge is discharged through the resistor.

This resistive earthing switch 15 has a resistive grounding contact section 17 and a direct grounding contact section 18 arranged in one direction perpendicular to the main conductor 14, so that the longitudinal direction is significantly reduced compared to conventional products. be. Therefore, the drive mechanism section 13 of the line disconnector 12 is arranged facing one direction in the circuit direction, and the drive mechanism section 16 of the resistor-equipped earthing switch 15 is placed on the opposite side from the drive mechanism section 13 of the line disconnector 12. Even if the line units are arranged facing the opening direction of the circuit, a sufficient number of line units can be stored within the space required for attaching and detaching the line units.

"Effects of the Invention" As explained above, the present invention provides the following effects.

(1) The installation area can be significantly reduced by combining a line disconnector and a resistive earthing switch and their rational arrangement.

(2) Economic efficiency improves by reducing the number of containers required as equipment becomes more complex.

(3) Reliability is improved by simplifying the structure and reducing the number of seals.

(4) As equipment becomes smaller, transportation methods become simpler.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the gas insulated switchgear of the present invention, Fig. 2 is a front view thereof, Fig. 3 is an enlarged sectional view showing the main parts of Fig. 1, and Fig. 4 is a conventional gas insulated switchgear. A plan view of the gas insulated switchgear, FIG. 5 is a front view thereof, and FIG. 6 is a single line diagram. In the figure, 11 is a composite switch 12 is a line disconnector 13 is a drive mechanism part 14 of a line switch, a main conductor 15 is a grounding switch with a resistor 16 is a drive mechanism part 17 of a grounding switch with a resistor The portion 18 is directly grounded, and the contact portion 26 is a resistor. Patent applicant Takatake Seisakusho Co., Ltd. Senda 1 figure - f21f + 3 figure - f exit

Claims (1)

[Claims] In a gas-insulated switchgear in which a line disconnector, a resistive earthing switch, a circuit breaker, etc. is housed in a container filled with an insulating medium, the resistive earthing switch is connected to a resistive grounding contact part connected to a resistor. , a grounded direct grounding contact part is arranged in one direction in the inter-line direction parallel to the floor and perpendicular to the main conductor, and the drive mechanism part of the resistor-equipped earthing switch is connected to the main conductor with respect to the resistor. A line disconnector is arranged outside in the same direction as the grounding contact and the direct grounding contact, and a line disconnector is housed in the same container as the resistor-equipped earthing switch, and the drive mechanism of the line disconnector is connected to the main conductor. In contrast, a gas insulated switchgear characterized in that it is configured as a composite switch disposed in the line-to-line direction on the opposite side to the drive mechanism section of the resistor-equipped earthing switch.