JPS60198024A - Buffer 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] [Technique of the Invention #i9 Field] The present invention improves the breaker performance in a buff 1 type gas breaker by controlling the gas flow that is blown onto the arc that occurs when the current is cut off. Regarding a buff 1 type gas breaker.

[Technical Background of the Invention] In recent years, as the short-circuit capacity has increased due to the increase in power transmission capacity, the breaking capacity of circuit breakers has also continued to increase. On the other hand, in order to downsize the equipment, we have increased the breaking capacity per point,
Efforts are being made to reduce the number of series breaker points. For this reason, the breaking performance of a breaker is limited to the voltage between the poles of the breaker. 9 design, optimization of the gas blowing mechanism is required.

FIG. 1 shows the structure of a contactor portion in an arc extinguishing chamber of a conventional gas circuit breaker of this type, and the figure shows a state in which the circuit breaker is in operation.

FIG. 2 is a sectional view taken along line 11 in FIG. 1 and viewed in the direction of the arrow. In the figure, 1 is a fixed main contact, and 2 is a fixed arc contact, which are fixed in an arc extinguishing chamber (not shown). Reference numeral 3 indicates a buffer cylinder 14, which is an insulating nozzle fixed in the axial direction at the end of the buffer cylinder 3, and reference numeral 5 indicates the fixed main contact 1 fixed to the outer peripheral surface of the joint between the nozzle 4 and the buffer cylinder 3. A movable main contactor 6 is provided inside the buffer cylinder 3 and is connected to an operation mechanism (not shown), such as a cylinder, and 7 is provided on the inner peripheral side of the end of the cylinder 6. A movable arc contact 8 that can be moved into and out of contact with the fixed arc contact 2 is a buff 1 piston that is slidably provided on the inner peripheral surface of the buffer cylinder 3 and the outer peripheral surface of the cylinder 6.

In such a configuration, by moving the cylinder 6 to the left in the figure using an operation mechanism (not shown), the insulating nozzle 4, the movable main contact 5, and the buffer cylinder 3 are all moved to the left in the figure, and the first movable cylinder 6 moves to the left in the figure. The arc contactor 7 contacts the fixed arc contactor 2, and then the movable main contactor 5 contacts the fixed main contactor 1, resulting in a closed state. In this closed state, current mainly flows through the fixed main contact 1 and the movable main contact 5.

In order to cut off the current from this state, the cylinder 6 should be moved to the right in the figure using the operating mechanism. In this case, the fixed main contact 1 and the movable main contact 5 are first separated, and then the fixed arc The contact 2 and the movable arc contact 7 are separated, and an arc 9 is generated between the fixed arc contact 2 and the movable arc contact 7. As the movable arc contact 7 moves away from the fixed arc contact 2, the insulating gas compressed by the buff 1 cylinder 3 that moves together with the fixed buff 1 screw I/n 8 and the movable arc contact 7 is sprayed onto the arc 9. Extinguish the arc. After the arc is extinguished, the insulating gas becomes high temperature and the movable arc contactor 7
The flow path passing inside the circle lI6 that supports the fixed j′・
- Contact 2 side I\ direction, ) 14M8! It is exhausted through one passage.

[Problems in the background art] By the way, the insulating nozzle 4 is provided to spray compressed insulating gas onto the arc at high speed, but the point where the insulating gas blown from the surroundings collides becomes a stagnation point 10, and the flow velocity is becomes very slow. Measure the flow of insulating gas in this case.
The result of one millimeter run is shown in Figure 3. The length of the vector in the figure represents the flow velocity. Third
As is clear from the figure, the place where the insulating gas blown from the surroundings collides becomes a stagnation point 1o, and it can be seen that the flow velocity of the insulating gas in this part is considerably slow. Since the shear breaker interrupts the current by spraying insulating gas at high speed onto the arc 9 and the high temperature hollow I gas generated by the arc 9, the stagnation point 10 has the disadvantage of deteriorating the interrupting performance.

[Objective of the Invention J The present invention has been made to eliminate the above-mentioned drawbacks, and the flow velocity of the insulating gas to be blown is slow in the area where arcs and hot gas are generated and where the B electric field is applied during the insulating opening process. It is an object of the present invention to provide a buffer type gas breaker which can eliminate such stagnation points, speed up the recovery of insulation between contacts for current interruption/connection, and improve the interruption performance.

[Summary of the Invention] In order to achieve the above object, the present invention forms a flow path in a cylinder supporting a movable arc contact and increases the flow rate of an insulating gas between the movable arc contact and the fixed arc contact. This prevents the formation of stagnation points that would slow down the process.

[Embodiments of the invention] Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 4 is a sectional view showing only the essential parts of one embodiment, and FIG. 5 is a sectional view taken along the v-v track in FIG. 4 and viewed in the direction of the arrow. As is clear from the figure, on the side of the cylindrical body, for example, the cylinder 6, which supports the movable arc contact 7, communication is established between the movable arc contacts 7 and the inside of the cylinder 6 and the buff 1 cylinder 3. The difference from FIGS. 1 and 2 is that a flow path, for example, a hole 11, is formed in the groove. The explanation will be omitted.゛In this case, the hole 11 has a cross-sectional area larger than half of the cross-sectional area of the flow path 13 between the movable arc contact 7 and the insulating nozzle 4, and the central axis of the hole 11 is At least 10mm away from the tip of the
Moreover, it is preferable that the inner side of the cylinder 6 is inclined at a distance of 80'' or less with respect to the central axis of the cylinder 6 toward the fixed arc contactor 1, that is, toward the left side in FIG.

The operation of the buffer breaker configured as described above will be explained below.

The state shown in FIG. 4 shows the state in which the isolation station is in operation. To reach this state, first the movable arc contact 7 is pulled out and separated from the fixed arc contact 2, and then the insulating nozzle 4 is moved away from the fixed arc contact 2. The handling has been completed. At this time, an arc 12 is generated between the fixed arc contact 2 and the movable arc contact 1 until the current reaches zero, and hot gas is created around the arc 12 by the arc 12, causing an electric current of 8! Even if the arc 12 disappears when the zero point is reached, the hora 1 gas remains. Whether or not a gas breaker succeeds in interrupting current depends on how quickly this hot gas is blown away and low-temperature insulating gas is sent between the inner contacts.

The insulating gas is supplied to the buff 1 piston 8 which is fixed during the opening operation.
Buff 1 cylinder 3 linked to movable arc contactor 7
compressed by Due to the holes 11 formed in the cylinder 6 that supports the movable arc contact 7, stagnation points are not formed in the region 14 near the movable arc contact 7 where a high electric field is applied, and the breaking performance is improved. This is clear from Fig. 6, which shows the results of simulating the flow of insulating gas using a control device. As is clear from this figure, stagnation points are no longer formed in the area 14 near the movable contact 7 where a high electric field is applied. Note that the length of the vector indicates the flow velocity.

[Effects of the Invention] As explained above, according to the present invention, it is possible to eliminate the stagnation point in the area where a high electric field is applied near the movable contact, which has a serious adverse effect on the breaking performance of the gas circuit breaker. It is possible to provide a buffer type gas breaker that can improve breaking performance.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the contact part in the arc extinguishing chamber of a conventional buff 1 type gas breaker, and Fig. 2 is the ff of Fig. 1.
-1 [G,: Cross-sectional view after cutting and looking in the direction of the arrow, 3rd
Figures 1 and 4 show the results of a meter simulation of the gas flow in the arc extinguishing chamber in a conventional buff type 1 gas breaker.
The figure is a plan view showing the contact portion inside the arc extinguishing chamber of an embodiment of the buffer type gas breaker according to the present invention, and Figure 5 is a cross-sectional view taken along the line v-■ in Figure 4. 6 is a sectional view of the gas flow meter in the arc extinguishing chamber according to 1) of this U.
It is a figure showing the result of simulation. 1... Fixed main contact, 2... Movable arc contact, 3
...Buff 1 cylinder, 4...Insulated nozzle, 5.
... Movable main contactor, 6... Cylindrical body, e.g. cylinder, 7...
Movable arc contactor, 8... Buffer piston, 11.
... Hole, 12... Arc, 13... Channel between movable arc contactor 2 and insulating nozzle 4, 14... Place near movable arc contactor 2 where a high electric field is applied. 1st [jI2il! lr

Claims (2)

[Claims] (1) A fixed arc contact in a container filled with insulating gas, a movable arc contact disposed opposite to the fixed arc contact so as to be able to move toward and away from the fixed arc contact, and an arc generated between the two arc contacts when disconnected. A gas breaker equipped with a buff 1 device for extinguishing the arc by spraying the insulating gas at the
A buff 1 type gas breaker, characterized in that a cylindrical body supporting the movable arc contact is provided with a flow path for spraying insulating gas from inside the movable arc contact. (2) The flow path formed in the solid body supporting the movable arc contact is a hole whose central axis is at least 10IIIrR away from the tip of the movable arc contact and at an angle of 80° to the central axis of the cylinder. In the following, the inner side is the fixed arc contact side, and the cross-sectional area of the hole is larger than half the cross-sectional area of the flow path between the movable arc contact and the nozzle.
Buffer type gas breaker as described in ).