JPS6276120A - 3-phase common tank type gas breaker - 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 Application of the Invention] The present invention relates to a three-phase common tank type gas circuit breaker (GC13+), and particularly relates to a circuit breaker structure with excellent custom-made insulation recovery during Taitun flow circuit interruption.

[Background of the invention]

Figure 43 shows the internal configuration of the shutoff tank l of a conventional three-phase common tank type GCH. Electrically insulated three-phase interrupter 2
, 3.4 are stored. (For example, Tokuko Sho 57-18
(See Publication No. 291). FIG. 4 is a view of FIG. 3 viewed from the top in the axial direction, and the three-phase shutoff section is arranged in a substantially symmetrical triangular shape with respect to the shutoff section tank l.

FIG. 5 shows a longitudinal sectional view of the cut-off phase. Stator 5, mover 6. Normal buffer-type shut-off parts such as a nozzle 7 and a buffer/linda 8 are housed in an insulating tube 9, and furthermore, a line is connected in parallel around the insulating tube 9 for rapid disconnection of a line fault 11 (SLF). A capacitor 10 is arranged. End fittings 11t/;j: have a diameter necessary to support and fix each captive body. and.

As is clear from FIGS. 3 and 4, the diameter of the end fitting 11 has an immediate effect on the insulation dimensions between the phases and the ground, and is a factor in determining the diameter of the cut-off tank l. Sasa determines the dimensions of the three-phase common tank type (,) CB. Therefore, the slight diameter of the end fitting 11 should be as small as possible. To that end, it would be best if the house in Hazensaki 9 was as small as possible. However, when the diameter of the insulating tube 9 is reduced, the large current interrupting performance, particularly the terminal short circuit fault (BTF') interrupting performance where a high voltage is applied immediately after the large current is interrupted, decreases by 1 degree.

The reason will be explained using FIG. 6. Figure 6 shows the state immediately after a large current is cut off.1. ! ! The arrow in J indicates the flow of high-temperature exhaust gas (hot gas) heated by the arc. When the diameter of the insulating cylinder 9 is reduced.

The hot gas is exhausted along the axial direction as shown. There is no main radial exhaust (dashed line arrow in the figure) at the shutoff part of a phase-separated tank without an insulating cylinder 9.5 As a result, the actual gas exhaust is delayed and the shutoff performance is degraded. As a countermeasure to this problem, a structure has been proposed in which the diameter of the central portion of the insulating tube 9 is made larger than that of the end portions, as shown in FIG.
Publication No. 2319).

Although such an I structure is effective to some extent in terms of interrupting performance, the diameter of the interrupter becomes larger, especially when a parallel capacitor 10 as shown in FIG. 5 is attached. This simply means increasing the diameter of not only the insulating cylinder 9 but also the end fitting 11 for supporting the parallel capacitor 10. Therefore, due to the design of the edges 1 and 18, the diameter of the cut-off tank 1 has to be increased, which increases the size of the GCB. There was a problem that was the main cause of the change in form. In addition, changing the position of the parallel capacitor 10 in the axial direction affects the electric field distribution between the poles of the interrupting part, and depending on the changed position, it may cause high voltage disturbances such as advanced small current interrupting performance. This is undesirable because it may affect the blocking performance in the field.

, [Object of the Invention] An object of the present invention is to improve the insulation recovery performance after a large current interruption without increasing the maximum diameter of the interruption part of a three-phase common tank type GCB so as to cause problems in terms of insulation design.

[Summary of the invention]

Experiments and theoretical analyzes conducted by the present inventors have revealed that the most important factor for insulation recovery after a large current interruption is the gas density near the stator 5. In other words, the hot gas at the tip of the stator 5 is quickly removed and the buffer cylinder 8 is removed.
It is clear that insulation recovery can be accelerated by replacing the air with high-density cold gas. For this purpose, it is most important to quickly remove the hot gas near the stator 5, especially at the tip.
It has been found that accelerating hot gas exhaust in the radial direction of the vicinity is effective. For this purpose, if an exhaust hole is provided in the vicinity of the stator 5 of the insulating cylinder 9, the diameter of the insulating cylinder 9 does not need to be increased, and the position of the parallel capacitor 1° does not need to be changed significantly.

[Embodiments of the invention]

The following two embodiments of the present invention are shown in Fig. 1 and Fig. 2.
BA. In FIG. 1, the parallel capacitor 10, stator 5, insulating tube 9, etc. have almost the same arrangement as in the conventional example shown in FIG. In this embodiment, a hot gas exhaust hole 12 is provided in a part of the side of the insulating cylinder 9.

An example of the position of the hot gas exhaust hole is shown in FIG. 2, which is a cross section taken along the line II--II in FIG. 1. A hot gas exhaust hole is opened between the parallel capacitors 10.

In Fig. 1, a flow guide 13 is provided in the upper outer part of the insulating cylinder 9 to change the radial exhaust flow from the hot gas exhaust hole 12 in the axial direction. is prevented.

As is clear from FIG. 1, the outer diameter of the flow guide 13 can be set to be approximately the same as the outer diameter of the partial pressure capacitor 10, so that the diameter of the blocking portion does not become large. The object of the present invention can be achieved by using either a metal or an insulator as the material for the flow guide 13, taking into consideration the potential of the capacitor at the intersection with the 1-part voltage capacitor 10.

FIG. 7 shows a modification of the invention. In Figure 1.

There is also a possibility that hot gas is blown onto the upper end of the partial pressure capacitor 10. Countermeasures can be taken by opening the hot gas exhaust hole 12 or controlling the gas flow within the flow guide 13, but Fig. 7 shows a configuration in which the hot gas flow path and the partial pressure condenser 10 are completely separated. Ruru. An exhaust tube 14 is provided for each exhaust hole 12. Figure 8 shows ■-■ of Figure 7.
It is a sectional view taken in the direction of arrows, and shows that the partial pressure capacitor lO and the exhaust pipe 14 are arranged alternately. By adopting such an arrangement, the protective support tube of the partial pressure capacitor 10 does not need to be partially made of a hot gas-resistant material, making it possible to reduce costs, and the thickness of the protective support tube can also be made thinner. Therefore, it is also effective in reducing the diameter of the blocking part.

FIG. 9 is an example in which the application of the present invention was studied in the case where a large-capacity lighting GCB could be developed without a parallel capacitor.

If the parallel capacitor is not needed, the BTF cutoff curve can be improved by increasing the diameter of the insulating cylinder 9 by the same size.

However, if it could be constructed with a conventional insulating tube,
It is now possible to reduce the diameter of the pongee.

Changes in the design of the connecting section can also be kept to a minimum.

It has many advantages. The present invention can also be applied to achieve this objective. FIG. 1O, like FIG. 4, is a view of the cut-off portion 2, 3, and 4 as seen from the axial position. By creating an equilateral triangular arrangement within a cylindrical shape, the loquat inevitably creates a large opening between the upper girders. By providing the exhaust pipe 14 at this position, the exhaust pipe can be provided without increasing the diameter of the soul-cut tank. In FIG. 9, a vent pipe 15 is provided in addition to the exhaust pipe 14 described in FIG. 7. The effect of this ventilation cylinder 15 will be described below. Nokunfanorinda 8 was in the closing position shown by the broken line during the shutoff operation.
moves rapidly downward, and if the difference between the inner diameter of the insulating cylinder 9 and the outer diameter of the buffer cylinder 8 is small, the pressure in the region C becomes more negative than the pressure of the sealed gas. Therefore, the hot gas exhausted from the nozzle 7 flows into this region and the exhaustion of the hot gas is delayed.

In the worst case, dielectric breakdown occurs in this area. Ventilation cylinder 15
This has the effect of reducing the degree of negative pressure in region C and further exhausting hot gas flowing into region C, contributing to the bending performance.

〔Effect of the invention〕

According to the present invention, the interrupting part of the three-phase common tank type GCB? 3
Since a gas exhaust passage that is effective in terms of shutoff performance can be added without increasing the diameter of the edge cylinder, it is possible to increase the shutoff capacity without increasing the diameter of the shutoff section tank.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of a three-phase common tank type GCB according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the If-n arrow in FIG. 1.
FIGS. 3 and 4 are sectional views of a conventional three-phase common tank type GCH, FIGS. 5 and 6 are structural diagrams of a conventional shutoff part, and FIG. 7 is a sectional view of a modification of the present invention. FIG. 8 is a cross section 9 taken along the line ■-■ in FIG. 9 and 10 are cross-sectional views of an embodiment of a pond according to the present invention. 5... Stator, 9... Absolute @ tube, 10... Parallel capacitor, 12... Exhaust hole, 13... Flora guide.

Claims (1)

[Claims] 1. An arc extinguishing section consisting of a fixed contact for each phase, a movable contact, an insulating nozzle and a buffer cylinder integrally constructed with the movable contact, and surrounding the arc extinguishing section. In a three-phase common tank type gas circuit breaker consisting of an insulating tube, a communication hole is provided on a side surface of the insulating tube to connect the gas space inside and outside the insulating tube, and the communicating hole is provided at an outer station of the insulating tube. A three-phase common tank-type gas circuit breaker, characterized in that a flow guide opens to the outside in the axial direction of the insulating tube near an end of the insulating tube.