JPS58209830A - Breaking device - 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] [Technical Field of the Invention] The present invention relates to the breaker of a vacuum breaker and the breaker of a vacuum breaker other than a vacuum breaker, such as an 8F6 gas breaker, an air breaker, or an oil breaker. This invention relates to a breaker device connected in series to a breaker-door for a device, etc.

[Technical background of the invention and its problems]

A DC interrupting device is already known in which the vacuum pulp, which is the interrupting part of a vacuum breaker, is connected in series with the interrupting part of a breaker other than the vacuum breaker, and a capacitor or a capacitor and a gap, etc. are connected in parallel to this. It is being As shown in Figure 1, assuming that the cutoff current Id is flowing in the direction of the arrow, when this current is cut off,
The breaker 1 of the vacuum interrupter and the breaker other than the vacuum interrupter, such as the breaker 2 of the SF6 gas breaker, are opened. Then, as shown in FIG. 2, an arc voltage is generated between the electrodes of the SF6 gas interrupter and the interrupter 2, and this rapidly increases due to the influence of the gas blown from the breaker. However, the rapid increase leads to short circuiting of the arc, causing a sudden drop in arc voltage. On the other hand, a capacitor 3 is connected in parallel to the breaker 1.2, and a charge similar to the arc voltage produced by the breaker 2 is stored in the capacitor 3, which corresponds to a drop in the arc voltage. The voltage generated becomes an electromotive force, and the capacitor 3- and the interruption part 2-
In the loop of the interruption part 1, a current is generated and flows as shown in FIG. If the drop in the oscillating current value IC arc voltage at this time is expressed as ΔV, and the inductance created by the loop of capacitor 3, interruption section 2 and interruption section 1 is expressed as L1, the capacitance of capacitor 3 is C. This l. t flow I flowing through the breakage parts 1 and 2
When the condition of Ia<Ic is reached, the direct current is interrupted. In FIG. 1, 4 is a non-linear resistor as a voltage dividing element, and 5 is a capacitor as a voltage dividing element.

However, in general, there is a limit to the ability of interrupters to generate and interrupt high-frequency current, and the SF6 gas interrupter described above is no exception to this. However, only the vacuum interrupter has a very superior high frequency interrupting ability compared to other interrupters.

Therefore, the above-mentioned frequency can always be kept at a high frequency. In other words, the capacitance i of the capacitor 3 connected in parallel with the interrupters 1 and 2 can be made extremely small, and the entire interrupter can be made extremely small.

As described above, by evacuating the L-interruption part of the breaker and configuring the vacuum pulp which is the breaker's breaker and the breaker of the breaker other than the vacuum L7 breaker in series, the It becomes possible to provide an excellent DC cutoff device. However, it is not possible to obtain an excellent DC interrupting device simply by arranging each component as shown in FIG. f, that is, as shown in Figure 1.

As shown in equation 0, the interruption prototype is due to Δva,
This is a high-frequency electric current device in which the current flows even if the interruption occurs, that is, the current becomes zero at the interruption portions 1 and 2. The size of is determined by the capacitance of capacitor 3 and the inductance created by these loops.

Under these conditions, when the current to be interrupted becomes large, the arc voltage-arc current characteristic of the breaker 2 that causes the occurrence of ■8 is a negative characteristic (the arc of the vacuum pulp of the chastity interrupter has a positive characteristic, but other (all of the circuit breakers exhibit negative characteristics), the arc voltage is low and the sudden fall of the arc Δva is also necessarily small. Therefore, there is a limit to the current that can be cut off.

[Purpose of the invention]

The present invention has been made based on the above-mentioned situation, and its purpose is to ensure that the flow can be interrupted even if the flow is large. Our goal is to provide the following.

[Summary of the invention]

The present invention is characterized in that a capacitor is connected in parallel to the interrupting part of the vacuum interrupters connected in series and to the interrupting part of the vacuum interrupter other than the vacuum interrupter and housed in a tank. .

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIG. The drawing shows the interrupting device according to the present invention in an open state, and numeral 11 in the drawing is a cylindrical tank with a bottom. In the axial center of the tank 11, an X empty valve 13, which is a vacuum interrupter 12, and a breaker other than the vacuum interrupter, such as an SF6 interrupter 14, are connected in series. connected and arranged. That is, the tank 11
As will be described later, an insulating spacer 16 is fixedly installed inside the insulating spacer 16, to which the fixed electrode 17 of the empty pulp 13 and the fixed electrode 18 of the interrupting part 15 of the SF6 gas interrupter 14 are fixed. has been done. Further, the movable electrode 19 of the vacuum pulp 13 is connected to an insulating rod 2) extending outside the tank 11 via a bearing 20 fixed to one end of the tank 11. On the other hand, the movable electrode 22 of the interruption part 15 of the SF6 gas breaker 14 is connected to an insulating rod 24 extending outside the tank 11 via a bearing part 23 fixed to the other end of the tank 11. There is. and,
The movable electrodes 19.22 are connected to the corresponding fixed electrodes 17.18 by transmitting the driving force from the operating section 25 through the rotary levers 26..., rods 27... and the insulating rods 21, 24f. It is designed to move towards and away from the opponent.

Further, a capacitor 28 is connected in parallel to the vacuum pulp 13 of the vacuum interrupter 12 and the interrupter 15 of the 8F6 gas interrupter 14 which are connected in series. That is, between the vacuum pulp IS of the vacuum interrupter 12 and one end of the tank 1, a hollow cylindrical capacitor 28 surrounds the movable electrode 19 of the vacuum pulp 13 of the vacuum interrupter 12, that is, the movable electrode It is arranged concentrically with 19. One end of this capacitor 28 is connected to a support 30 and an insulating tube 31.
The movable electrode 1g is fixed to the bottom of the tank 11 via the support 30 and the current aggregate 32.
The support 30 is electrically connected to the conductor 3.
3 to a fitting 34 outside the tank 11. On the other hand, the other end of the capacitor 28 is connected to the insulating spacer 16 and fixed to a metal shield 35 disposed so as to surround the vacuum pulp 13 of the vacuum breaker 12. This metal shield 35 surrounds the SF6 gas cutoff section 15 and is electrically connected at one end to a metal shield 36 connected to the insulating spacer 16. The other end of the metal shield 36 is fixed to the tank 11 via an insulating tube 37. Further, the metal shield 36 is attached to a support 39 fixed to the bearing portion 23, and is electrically connected to the movable electrode 22 via the support 39, and the support 39Id conductor 40f.
: Connected to the bushing 41 outside the tank 11 through. When the breaker is in the closed state, the DC current introduced from the bushing 34 flows through the conductor 33, support 30, current assembly 32, movable electrode 19, fixed electrode 17,
Fixed electrode 18, movable electrode 22, support 39 and conductor 40
It is designed to be led out to the bushing 41 through sequentially.

Note that the inside of the tank 11 is completely sealed, and SF6 gas is sealed inside. Also, vacuum pulp 1
3 is sealed in a space surrounded by a metal shield 35 and an insulating spacer 16.

Therefore, the oscillating current flows through the capacitor 28 and the metal shield 3.
5, 36, 8F6 gas interrupter 14 movable electrode 22
, the fixed electrode 18, the fixed electrode 11 of the vacuum pulp 13, the movable electrode 19, the current collection terminal 32, and the support SO, and then flows back to the capacitor 28. In such a current path, theoretically, the magnetic fluxes produced by the outgoing and returning currents cancel each other out and become zero, that is, the inductance created by the above-mentioned loop becomes zero.

However, in reality, a certain amount of inductance will occur, but it is still much smaller than simply making the connections shown in Figure 1, and its value will depend on each individual case. Although it is different, it is possible to reduce it to about 0.7 to 10μH, and if you design with great care, it can be reduced to 1
It is possible to cut off 0 to 15 kA.

In addition, since the vacuum pulp 13 is sealed in a space surrounded by the metal shield 35 and the insulating spacer 16, the 8F4
If the interruption part 15 of the gas interrupter 14 is used, a separated gas of SF6 gas will be generated during interruption, and this will corrode the surface layer of the insulating tube of the vacuum pulp 13, which is generally made of glass or ceramic. It can also be used to prevent this from happening. Unfortunately, this sealing structure allows the insulating medium on the sealed side of the vacuum pulp 13 and the insulating medium in the tank 11 to be different as necessary.
Furthermore, even if the same insulating medium is used, different pressures can be maintained. That is, although a bellows 44 is attached to the vacuum pulp 13 to create a vacuum, this bellows 44 cannot withstand high pressure.

Note that FIG. 4 shows another embodiment of the present invention),
In this example, it reaches tank 11, where tank 1
Metal shield 35.36 and vacuum pulp 13 and SF
6 gases and the interrupting part 150 of the interrupter 14 support both fixed electrodes 17 and 18. Metal shields 35 and 36
The connection is made using the connection collar 4 embedded in the insulating spacer 45.
6. In the above configuration, the capacitor 28
Not only can you further fix 9,
Since the inside of the tank 11 can be separated, the vacuum pulp 1
It can be useful for 3. Furthermore, the bearing part 23
It is possible to sparrow.

[Effects of the Invention] As explained above, the present invention provides excellent effects such as being able to reliably cut off even if the current to be cut off is large.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a general interrupting device, Fig. 2 is a diagram showing the relationship between voltage, current, and time when interrupting current in the same device, and Fig. 3 is a configuration diagram showing an embodiment of the present invention. , FIG. 4 is a block diagram showing another embodiment of the present invention. 11...Tank, 12...Negative air breaker, 13...
- Interrupter (X empty pulp), 14... Interrupter other than vacuum interrupter (8F6 gas interrupter), 15... Shutoff section, 28... Capacitor. 11- Figure 1d Figure 2

Claims (2)

[Claims] (1) A breaker device characterized in that a capacitor is connected in parallel to the breaker part of a vacuum breaker connected in series and to the breaker part of a breaker other than the vacuum breaker and housed in a tank. (2) The interrupting device according to claim 1, wherein the capacitor is formed into a hollow cylindrical shape and is arranged concentrically with the above-mentioned interrupting portion.