JPS6362048B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetically driven arc extinguishing device that extinguishes an arc generated during opening by magnetically driving a magnetically driven coil.

[Conventional technology]

As shown in FIG. 1, a conventional magnetically driven arc extinguishing device includes a magnetically driven coil 2 wound around a magnetic core 1.
The winding end 3 of the magnetic drive coil 2 is connected to a fixed arc contact 4 whose middle part is formed in an arc shape surrounding the magnetic drive coil 2, and the winding start end 5 of the magnetic drive coil 2 is connected to a fixed main contact 6.

Further, a movable arc contact 8 that comes into contact with and leaves the fixed arc contact 4 is rotatably attached to the movable main contact 7 that comes into contact with and leaves the fixed main contact 6.

In this closed state, the load current flows from the fixed main contact 6 to the movable main contact 7.

Then, when opening, move the movable main contact 7 downward,
First, the movable main contact 7 is separated from the fixed main contact 6.

At this early stage of contact opening, both arc contacts 4,
8 is still in contact, and the load current is fixed main contact 6
It then flows through the magnetic drive coil 2 to the fixed arc contact 4, the movable arc contact 8, and the movable main contact 7.

Further, due to the downward movement of the movable main contact 7, the movable arc contact 8 is separated from the fixed arc contact 4.

At this time, an arc is generated between the two arc contacts 4 and 8, but since the magnetic drive coil 2 has already been excited due to the separation of the two main contacts 6 and 7, the arc is caused by the magnetic drive coil 2. It is driven, travels along the fixed arc contactor 4, is pushed into an arc extinguishing chamber (not shown), is expanded, cooled, and extinguished.

It should be noted that the current during the time when an arc is generated between both the arc contacts 4 and 8 flows through the same path in the initial stage of contact opening.

[Problem to be solved by the invention]

By the way, when the delayed current is interrupted, the arc between both arc contacts 4 and 8 is very difficult to break and is likely to re-ignite. When the magnetic drive coil 2 is re-ignited, a very high abnormal voltage is instantaneously generated between the winding start end 5 and the winding end 3 of the magnetic drive coil 2 due to the transient phenomenon of the current flowing at that time.

However, in the conventional device, FIG.
As shown, the winding start end 5 of the magnetic drive coil 2
Since both ends of the winding end 3 are close to each other, a sparkle may occur between the ends.

Further, as shown in FIG. 3B, even if the winding end 3 is pulled out apart from the winding start end 5, since they are close to each other at the part indicated by A in the figure, a flashover may occur.

On the other hand, if the coil insulation of the magnetic drive coil 2 is strengthened in order to prevent this flashover, there is a problem that the magnetic drive coil 2 becomes larger and the entire arc extinguishing device becomes larger.

The present invention has been made with the above points in mind, and an object of the present invention is to prevent a flashover between both ends of a magnetic drive coil and to prevent the magnetic drive coil from increasing in size.

[Means to solve the problem]

In order to solve the above problem, the magnetically driven arc extinguishing device of the present invention has a magnetic iron core wound with a magnetic drive coil placed between two arc extinguishing chamber side plates made of magnetic pole plates, orthogonal to the arc extinguishing chamber side plates. The winding start end of the magnetic drive coil is connected to the magnetic core, the magnetic core is connected to the fixed main contact via the arc extinguishing chamber side plate, and the winding end of the magnetic drive coil is connected to the magnetic core. It is connected to a fixed arc contact.

[Effect]

In the magnetically driven arc extinguishing device of the present invention configured as described above, the winding start end of the magnetic drive coil is connected to the magnetic iron core, and the winding end of the magnetic drive coil is connected to the fixed arc contact. , the ends of the magnetic drive coil are not close to each other, the insulation between the ends is strengthened, and even if an abnormal voltage occurs between the ends, a flashover between the ends is prevented, and the magnetic drive coil is larger. is prevented.

〔Example〕

An example will be described with reference to FIG.

In the same figure, reference numeral 9 denotes an arc extinguishing chamber side plate made of a magnetic pole plate, 10 denotes a magnetic core mounted between two arc extinguishing chamber side plates 9 orthogonally to the arc extinguishing chamber side plate 9, and wound with a magnetic drive coil 11; 12 is the magnetic drive coil 1 in the middle
This is a fixed arc contact formed in an arc shape surrounding 1.

Reference numeral 13 denotes the winding end of the magnetic drive coil 11, which is connected to the fixed arc contact 12. 14 is a coil winding start end of the magnetic drive coil 11, and is directly connected to the magnetic core 10.

15 is a fixed main contact attached to the arc extinguishing chamber side plate 9 with bolts 16; 17 is a movable main contact that moves toward and away from the fixed main contact 15; 18 is a movable main contact 1
Fixed arc contactor 12 is rotatably attached to 7.
It is a movable arc contactor that is moved in and out of contact.

Then, the winding start end 14 of the magnetic drive coil 11
The magnetic core 10 to which is connected is connected to the fixed main contactor 15 via the arc-extinguishing chamber side plate 9.

In the closed state shown in the figure, the load current flows from the fixed main contact 15 to the movable main contact 17.

Then, when the movable main contact 17 is moved downward at the time of opening, both the main contacts 15 and 17 are first separated. At this early stage of contact opening, both arc contacts 12, 1
8 is still in contact, and the current flows through the fixed main contact 15.
It then flows through the arc extinguishing chamber side plate 9 to the magnetic core 10 , magnetic drive coil 11 , fixed arc contact 12 , movable arc contact 18 , and movable main contact 17 .

Furthermore, when both arc contacts 12 and 18 are opened by the downward movement of movable main contact 17, an arc is generated between both arc contacts 12 and 18, and the current at that time follows the same path as in the initial stage of opening. After that, the arc is extinguished by driving the magnetic drive coil 11.

Therefore, at the time of re-ignition, such as when the delayed current is cut off, the winding start end 14 of the magnetic drive coil 11
When an abnormal voltage occurs between both ends of the winding end 13 and the winding start end 14 of the magnetic drive coil 11,
As shown in FIG. 4, since it is connected to the magnetic core 10, the two ends 13 and 14 are no longer close to each other, and the insulation between the two ends 13 and 14 of the magnetic drive coil 11 is strengthened. 1
1 can be prevented from collapsing at both ends 13 and 14.

In addition, by preventing flashover, the magnetic drive coil 1
Since the insulation strength of one coil can be made relatively weak, the magnetic drive coil 11 can be downsized, and the arc extinguishing device can also be downsized.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

Since the winding start end 14 of the magnetic drive coil 11 is connected to the magnetic core 10, the magnetic drive coil 1
Both ends 13 and 14 of 1 are not close to each other, and both ends 13 and 14
This strengthens the insulation between both ends 13 and 14 of the magnetic drive coil 11 due to an abnormal voltage generated between both ends 13 and 14 during re-ignition or re-ignition, and furthermore, Since the coil insulation of the coil 11 can be weakened, the magnetic drive coil 11 can be downsized, and the arc extinguishing device can be downsized.

[Brief explanation of drawings]

FIG. 1 is a front view of a part of a conventional magnetically driven arc extinguishing device, FIG. 2 is a front view of a part of an embodiment of the magnetically driven arc extinguishing device of the present invention, and FIGS. 3a and 3b are FIG. 1 is a partially cutaway side view of another conventional example, and FIG. 4 is a partially cutaway side view of FIG. 2. 9... Arc extinguishing chamber side plate, 10... Magnetic core, 11... Magnetic drive coil, 12... Fixed arc contactor, 13... Winding end end, 14... Winding start end, 15... Fixed main contactor.

Claims (1)

[Claims] 1. A magnetic core wrapped with a magnetic drive coil is installed between two arc extinguishing chamber side plates made of magnetic pole plates, orthogonally to the arc extinguishing chamber side plates, and the winding start end of the magnetic drive coil is connected to the magnetic core. At the same time, the magnetic core is connected to a fixed main contact via the side plate of the arc extinguishing chamber, and the winding end of the magnetic drive coil is connected to the fixed arc contact. .