JPS5983310A - 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] The present invention relates to a high voltage/large capacity circuit breaker.

The short-circuit capacity of power systems continues to increase as demand for magnetic power increases and supply sources become more unevenly distributed. Along with this, is it necessary to use electricity? The responsibility placed on the disconnector is to increase the voltage and increase the voltage. In recent years, high voltage/large capacity circuit breakers have become
・M! Fi8 F with excellent tri-edge properties and arc-extinguishing properties.

Buffer-type gas circuit breakers using gas are the mainstream. Its excellent arc-extinguishing properties have a breaking capacity of 300 kV, 50 kA per unit, and the combination of this unit allows for 500 kV, 63 kA, 2 short bursts, and 1,100 kV, 63 kA, 4 short bursts.

However, what about Pan 7A type gas? The breaking properties of the disconnector are significantly affected by the current change rate (di/dt) near the current zero point (di/dt) and the rate of rise in the re-electromotive voltage of the DC cut-off cross section wave (dv/dt). The disconnection current becomes thick, d
When i/d t becomes large, short-range road failure <5LF
)L, breaker duty, high frequency component re-electromotive voltage ((IT几V)) generated by the line conditions on the bus side of the breaker, when dv/dt is high, such as in the case of high dv/dt, Kame Nagashi 1'P
Within a few microseconds after disconnection, thermal breakdown occurs at a voltage of several tens of kV or less, and the percentage of successful repairs increases.
The limit of cut-off performance is determined by this thermal breakdown. For this reason, if the current is large, the sea? There are many cases where a capacitor is inserted in parallel to the disconnection to make dYydt a little gentler and improve the ability to shut down due to thermal breakdown. However, inserting a capacitor in parallel to the shear break has a major drawback in terms of insulation reliability. It is desirable to increase the capacity of the capacitor to improve the voltage sharing ratio.

On the other hand, vacuum breakers have excellent insulation recovery characteristics,
Due to thermal destruction? There are few cases where disconnection is unsuccessful, and it may occur due to dielectric breakdown after the voltage has recovered to a certain extent. Demonstrates characteristics that lead to failure. But the vacuum? It is difficult to increase the withstand voltage per unit of disconnectors, and up to now, disconnectors with a maximum magnetic pressure of 72 kV are known.

As mentioned above, when creating a high-voltage, large-capacity circuit breaker, it is important to What is the characteristic of a disconnector whose performance is determined by thermal breakdown, and what is the characteristic of a vacuum? It has been known to use a gas PM circuit breaker and a vacuum circuit breaker in series so that the performance of the circuit breaker is determined by dielectric breakdown, which complement each other.

For example, JP-A-56-128527, JP-A-57-
36733, as disclosed in Japanese Patent Application Laid-Open No. 56-76128, a gas breaker and a vacuum breaker are connected in series, and a resistor and a capacitor are connected in parallel with each other to reduce the initial stage of the restart voltage rise. There is one in which a high voltage region is applied to a vacuum breaker, and a high voltage region after the initial thermal breakdown region is cleared is applied to a gas breaker.

In this way, when a parallel impedance is inserted into the shear break, the overall shape becomes larger due to the size of the impedance element, and when stored in a container, the container becomes larger. There are drawbacks, such as the reliability of the insulation of the parallel impedance element.

In addition, by applying the excellent disconnection performance of the A circuit breaker, a circuit breaker of the type in which the insulation duty is borne by another circuit breaker or a Wr circuit breaker is proposed, for example, in accordance with the Japanese Utility Model Publication No. 46-166.
87, a disconnector.

Alternatively, a method is known in which the vacuum breaker is closed again after opening the new circuit.

FIG. 1 schematically shows the f-cutting device disclosed in Japanese Utility Model Publication No. 46-16687. The vacuum switch 1 is composed of an air parallel switch 2 and a switch 3 arranged in series with them, and one end plate 4 of the vacuum switch 1 is connected to a terminal 6. , a contact 7 on the fixed side of the vacuum switch is connected to the end plate 4. The terminal 6 is connected to one sliding contact 8 of the parallel switch 2 . The other end plate 5 of the vacuum switch is electrically connected to a sliding contact 9, and the sliding Nh contact 9 acts as one terminal for each of the parallel switch 2 and the series switch 3. .

The movable contact 11 of the vacuum switch 1 is sealed by a bellows 12 and is attached to the end plate 5 so as to be movable in the axial direction, and can be driven from inside the system by the iron 13.

The crank arm 14 is rotatable around a shaft 15 that is a fulcrum, and is driven by a drive KJJ mechanism (not shown).
4ff: By rotation, the link 18.19, which is engaged with the crank arm 14 by the pins 16 and 17, respectively drives the nitrogen switch ti and the parallel switch 2.3. At this time, the position of the pin 16 is closer to the shaft 15 than the position of the pin 17, so the stroke of the movable contact of the vacuum switch is shorter with respect to the rotation angle of the crank #14. In addition, a protrusion 20.21 is formed on the leak 18, and when the leak 18 is displaced by a predetermined distance, the protrusion 20 engages with the row 222 attached to the iron 13, and the contact is not activated. 11 to open the vacuum switch.

At this time, the movable contacts 23 of the switches 2 and 3 driven by the link 19 engaged with the crank arm 14 by the pin 17 are at the position 24, and the sliding contact 8 and the movable contact 23 is opened when the vacuum switch 1 enters the closed circuit state, so it is opened without any open arc. Next, the convex sea bream enclosing insect 23 slides #
While in contact with the contactor 9, contacts 7 and 11 of the vacuum switch 1 are opened to cut off the current, and with the current cut off, the contactor 3 and the vacuum switch 1 are opened by a non-forming arc. , i'' When the T moving contact 23 reaches the position 25, the protrusion 21 of the link 18
By engaging the roller 26 in the fixed position and lifting the link 18, the protrusion 20' and the rod 1 of the vacuum switch are removed.
3 is disengaged, and the vacuum enclosure i1 is closed. According to this method, vomiting first? The re-electromotive voltage immediately after the disconnection is withstood by the vacuum switch, but the normal magnetic pressure and insulation specifications mean that the voltage should be withstood between the poles of the switch and the switch 3. In this example, if the switching surge generated in the breaker is high and exceeds the withstand voltage of the Makabe switch, it cannot be used, so it is used for high voltage.
There were many drawbacks that made it impossible to apply it as a device.

The purpose of the present invention is to eliminate the parallel impedance element that is inserted into the device, or to reduce the force and reduce the force of the current. It is to provide rupture equipment.

The standby of the present invention is such that the buffer type gas breaker is opened to a certain extent and can withstand the peak value of the re-electromotive voltage of the wake-up breaker.
When the problem occurred, the vacuum breaker was opened, and the vacuum breaker was closed after the breaker was removed, so that high voltage was not applied to the 1'P breaker.

An example of the present invention will be explained with reference to FIG. In this embodiment, a vacuum is created in the tank 31 at the pumping position.

death? 4? Vessel 32. And pan 7a type gas shiichi? Disconnector 33
3 is arranged, and the tank interior space 34 is filled with SF6 gas. - current flows through conductor 37 in terminal 35:Q-dancing 36 to contact 38 in vacuum breaker 32.
39em! :1. Pamphlet type breaker / ring 40
Flows from the terminal 35 through the fixed contact 41 to the other terminal 35, and is a vacuum breaker and buffer type one? F! fr6 are connected in series.

The one shown in this example? The operation of the disconnection device is controlled by an operating device (not shown) and a gas-tight rod 424. J, the driving force is applied via the insulated operating rod 43 to links 45 and 46 connected to the insulated operating rod 43 by the pin 44.
After exhaustion, each link rotates the lever 47.48 around the respective fixing agent 49.5C1 and changes the direction of the driving force, and then the link 51 and the buffer for driving the vacuum chamber and the buffer. The link 52 for driving the disconnector is driven.

The buffer type gas blower breaker exhibits sufficient breaker performance only after the blower chamber has been compressed to some extent and the fixed contact has pulled out the nozzle. Is there an electric current? It is necessary to maintain the conditions that allow for disconnection for at least 0.5 cycles. Therefore, the stroke of the buffer type 1'P disconnector needs to be relatively long.

On the other hand, a vacuum shear breaker has a maximum distance between J poles within a certain range in terms of current flow and shear breakage, and this length is small compared to the stator of a buffer' type shear breaker. be. Therefore, vacuum with the same operating device? When driving a breaker and a buffer type gas breaker, it is necessary to devise a way to change the entire stroke of each shear breaker. By this,
S'? I try to change the stroke of the section. In other words, the lever 47 makes the length of the arm connected to the link 51 smaller than the length of the arm connected to the link 45, so that the vacuum can be removed. The stroke on the fr speaking side is shortened, and conversely, the arm connected to the link 52 of the lever 48 is lengthened to lengthen the stroke of the Nokunfa type breaker.

Vacuum? Excellent insulation recirculation characteristics of disconnectors? In order to make the most of the current, the buffer type gas breaker must be in contact with the vacuum breaker so that it reaches a state where the insulation recovery characteristics of the vacuum breaker are sufficient to withstand the current and the current value of the breaker's restart pressure wave. It is necessary to adjust the opening time. In a non-embodiment, a link 18 having a projection 20.21* similar to that disclosed in FIG. 1 is connected to a link 51 for driving the vacuum breaker, and the movable contact 39 of the vacuum breaker 32 is The roller 22 provided on the driving rod 13 and the protrusion 20 are configured to engage with each other with a play lever, and roughly speaking, when a predetermined displacement is achieved, the protrusion 21 comes into contact with the roller 26 provided on the fixed part and the hinge is formed. 18), the engagement between the two protrusions 20 and the roller 22 is released, and the force of the spring 53 returns the movable contact to the fully closed position.

The effect of re-closing the vacuum shut-off T device after the cut-off operation is that, first of all, when a Japanese current is applied to the Makabe FF T device, welding occurs at the contact part, which lowers the shield characteristics. It is not possible, and it is preferable to close the circuit in a non-arc state.
Second, in general, the closing speed of a gas circuit breaker is
Because Ji is fast.

This is because if the vacuum breaker is configured to be closed at the same time, the reliability of the vacuum breaker will be reduced.

What are the opening and re-closing times of the vacuum breaker?

This is closely related to the disconnection performance of buffer type circuit breakers.

As mentioned above, it is preferable to bring the vacuum breaker into a state where the insulation characteristics of the buffer type gas breaker are sufficiently established. In general, the reason why the dielectric strength of a buffer type gas breaker improves is that even if the fixed contact opens the nozzle and clears the initial part where the rise rate of the restart voltage is high, the wave height of the restart magnetic pressure increases. If direct voltage is applied, the buffer type gas will not be able to withstand the pressure, and the main breaker will fail due to dielectric breakdown of the breaker as a whole.
Is the opening time of the M device the same as the Pan 7A type gas? It is preferable to select almost the same time as the opening time of the disconnector.

By doing this, a vacuum is created. It is possible for the 7I8 edge characteristics of the buffer type gas breaker to reach the required performance in a time approximately equal to the time it takes for the ρτ device to obtain sufficient one-edge recovery characteristics.

Regarding the re-closing time, after the Makabe breaker has established sufficient insulation recovery characteristics, it is necessary to maintain the full characteristics for at least 0°0.5 cycles, and in this example, the protrusion 2
1 comes into contact with the roller 26 and the protrusion 20 is removed from the roller 22 after -X is 0.5 cycles after the contactors of the circuit breaker are separated, and before the breadcrumb type circuit breaker completes its stroke. is necessary.

According to this embodiment, it is possible to realize a grounded tank-type gas-insulated breaker that has excellent thermal breakdown characteristics and can withstand high voltage.

FIG. 3 shows another preferred embodiment of the present invention, which is applied to an insulator type breaker. Makabe breaker 32
．． A buffer type gas breaker 33 is housed in an insulator tube 61 filled with gas. Also in this example,
By changing the length of the arms of levers 47 and 48, the stroke of the vacuum breaker is made shorter than that of the buffer gas breaker, and the opening time of the vacuum breaker is roughly delayed.

Does a buffer type gas breaker ensure sufficient dielectric strength and handle current? The vacuum breaker is designed to have excellent insulation recovery characteristics in a state where the peak value of the restart voltage can be completely cleared. Therefore, in the fifth embodiment, the lever 47 is provided with a hook function, and the lever 47 is provided with a hook function to prevent the vacuum from being released. The hinge 62 is connected to the drive ring 13 of the 0J' contact 39 of the disconnector, and the projection 6 is attached to the hinge 62.
3, the protrusion 63 (!) is driven with the hook part 64 of the nilever engaged, and when the hook part 64 of the ni lever is stroked, the hook part is released and the Makabe breaker is closed by the force of the spring 530. Vacuum breaker The opening time is delayed by causing the fixed side contactor 38 to follow the movable side contactor by a predetermined distance using the gold spring 65.

According to this embodiment, it is possible to realize an insulator-type, gas-insulated type breaker that has excellent thermal breakdown characteristics and can withstand high voltage.

FIG. 4 shows another embodiment of the present invention, in which two buffer-type gas circuit breakers are arranged in series, and one vacuum circuit breaker is arranged in series. Also in this example, is it possible to use a vacuum? Is it possible to set the disconnection contact opening time using a buffer type gas? After delaying the disconnection, the buffer type gas breaker has sufficient insulation properties and is in a state where it can clear the peak value of the re-electromotive voltage of the current breaker, and the vacuum breaker is in a state where the insulation recovery characteristics are excellent. We are making it possible to achieve this. Also, the lever 71 should be adjusted so that the stroke of the vacuum breaker is short (as compared to the stroke of a pumper type breaker).
Adjust with. Furthermore, it is possible for the A-nitride breaker to shift to the recirculation operation at the time of a predetermined displacement stroke (by applying the mechanism shown in FIG. 2).

In this embodiment, the hinge 72. which is engaged with the insulated operating rod 43 and which drives the buffer type 1'P prayer part.
73 needs to be made of an insulator.

According to this embodiment, a high-voltage breaker in which two buffer-type circuit breakers are connected in series can realize a large-capacity 1'P@ device with excellent thermal breakdown characteristics. Note that the present invention can also be applied to a multi-point circuit breaker having three or more buffer-type circuit breakers.

According to the present invention, by utilizing the high insulation properties of the buffer type breaker and the excellent insulation recovery properties of the vacuum phosphor analyzer, a high voltage, large capacity breaker device can be realized in a small size and with high reliability.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a conventional device, FIG. 2 is a partial sectional view of an embodiment of the present invention, FIG. 3 is a vertical sectional view of another embodiment of the present invention, and FIG. 4 is a further embodiment of the present invention. It is a principle structure diagram of an example. 31... Gas container, 32... Vacuum cutter, 33.
...Buffer type gas breaker%47.48...Lever, 18...Link, 20.21...Protrusion, 22.2
6...Figure 1, Figure 3

Claims (1)

[Scope of Claims] 1. A buffer type cutoff section and a vacuum cutoff section are provided in a container filled with an insulating/arc-extinguishing gas, and these are electrically connected in series. In the device, the operation stroke of the breaker in vacuum is shorter than the operation stroke of the buffer type breaker, and when the circuit is opened, the contact opening time of the breaker in vacuum is shorter than the shorts 1.
The opening time of the contact of the breaker section is delayed by the method, and the breaker section in the vacuum shifts to the closing operation before the Lf breaker operation stroke is completed. After the frIih operation is completed, the breaker device is configured to be in a closed circuit state. 2. In the shear cutting device according to claim 1,
The present invention is characterized in that the time at which the contact at the breaker section in the wall is opened almost coincides with the time at which the fixed contact pulls out the nozzle at the buffer section using the buffer method. disconnection device. 3. In the shearing breaker device according to claims 1 and 2, the time at which the breaker section shifts to closing operation in vacuum is after 0.5 cycle of current frequency after the contact is opened. A breaker device characterized in that it is configured such that the breaker is turned on.