JPS5921130B2 - Gas cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arc rotation type gas breaker, and a first object of the invention is to reduce the horizontal magnetic field generated by a drive coil;
A gas breaker that makes effective use of both vertical magnetic fields, effectively extends the arc length in a stronger magnetic field to facilitate arc extinguishing, and has a short-circuit ring at the tip of the movable electrode that doubles as a shield ring. It is about providing.

In addition to the above-mentioned objects, a second object of the invention is to provide a gas breaker in which the initial arc generated between the fixed and movable electrodes is quickly transferred to the fixed arc electrode.

As is well known, for example, in a 3/6 KV class gas breaker, a drive coil is installed, and when the circuit is cut off, the cutoff current is commutated to the drive coil through an arc generated between the fixed and movable electrodes. There is a type in which the arc column is rotationally driven by the interaction between the magnetic field and the arc itself, and the arc column is cooled and electrons are adsorbed by the relative velocity with the arc extinguishing gas, thereby self-extinguishing the arc at the zero current point.

FIGS. 1, 2, and 3 show the structure of a conventional device of this type.

In FIG. 1, an arc generated between a fixed electrode 1 and a movable electrode 30 is commutated to a fixed arc electrode 2 and a drive coil 4, and an arc 5 is rotationally driven inside the drive coil 4.

Figures 2 and 3 are for driving the arc 5 to rotate outside the drive coil 4, of which Figure 2 is for constantly flowing current through the drive coil 4, and Figure 3 is for arc extinguishing by the buffer device 9. The arc is commutated to the fixed arc electrode 2 by blowing gas.

As shown in FIGS. 1 to 3, among the magnetic fields H1 to H4 generated by the drive coil 4, only the magnetic field H2 in FIG. 1 and H3 in FIGS. 2 and 3 is used; The magnetic field is not used effectively.

In FIGS. 1 and 3, it takes time for the arc to jump from the fixed electrode 1 to the fixed arc electrode 2, and in FIG. 2, there is a possibility that the arc will not be able to be turned on due to the repulsive force when it is turned on.

In the structures shown in FIGS. 2 and 3, there is a risk that the arc 5 will be pressed against the wall surface of the fixed arc electrode 2 due to the rise of hot gas generated by the arc 5, and the rotation of the arc 50 will be interrupted.

In Fig. 1, since it is necessary to generate an arc inside the drive coil, the drive coil 4 must be provided outside the cylindrical fixed arc electrode 2, and the outer diameter of the drive coil 4 is large (therefore, the coil The inductance of will also increase.

As a result, there are disadvantages in that it takes time to commutate the breaker current to the drive coil 4 and that the outer diameter of the breaker becomes large.

In addition, 6 is a magnetic metal body provided outside the drive coil 4, 7 is a magnetic metal body attached to the fixed electrode 1, 8 is a buffer chamber, 13 is a lower flange, and 20 is filled with arc-extinguishing gas. It is an insulated cylinder.

The present invention has been proposed in consideration of the above-mentioned points, and is described below in the fourth section.
This will be explained based on FIGS.

FIG. 4 is a longitudinal cross-sectional view of a gas breaker showing an embodiment of the present invention in a closed state, and FIG. 5 is a vertical cross-sectional view showing details of the breaker in a closed state.

The current path will be explained from the top.

The circuit current reaches the fixed electrode 1 via the fixed electrode support conductor 16 passing through the upper flange 12.

A movable electrode 3 is provided facing the fixed electrode 1, and the two electrodes form a ring-shaped abutting contact.

The circuit current passes through the electrodes 1 and 3, passes through the movable electrode rod 17, penetrates the lower flange 13, and is guided to the current collecting contact 18.

Further, 4 is a drive coil, 2 is a fixed arc electrode, and the drive coil 4 is wound around the fixed electrode 10 in a coil shape, and one end thereof is provided on the fixed electrode 1; the other end connected to the flange 19 is a fixed arc electrode. Connected to electrode 2.

These fixed electrode 1, fixed arc electrode 2, movable electrode 3,
The drive coil 4 is housed in a sealed container composed of an insulating cylinder 20, an upper flange 12, and a lower flange 13.

An arc-extinguishing gas 21 (for example, SF6 gas) is sealed in the sealed container, and when the electrodes are separated, the cutoff arc is extinguished within the gas.

Next, the structures of the fixed electrode 1, fixed arc electrode 2, movable electrode 3, and drive coil 4 will be explained with reference to FIGS. 4 to 7.

The drive coil 4 is wound vertically in a coil shape around the outer periphery of the fixed electrode 1 as a bobbin.

Therefore, the diameter of the coil becomes small, a coil with small self-inductance against the generated magnetic field is obtained, and commutation of the cutoff current to the drive coil 4 becomes easy.

The fixed arc electrode 2 has a substantially bowl-like shape and is made of a conductive material such as copper i.

A short-circuit ring is formed on this fixed arc electrode 2, and a drive coil 4 is formed on the fixed arc electrode 2.
A notch 22 shown in FIG. 6 is provided to prevent the magnetic field H generated by the magnetic field from being canceled out.

The notch 22 is designed to have a width of about 2 mrtt, for example, so that the arc can easily jump without getting stuck in the notch.

The fixed electrode 1, the fixed arc electrode 2, and the drive coil 4 are integrally cast with a resin 23 such as epoxy resin.

The fixed arc electrode 2 can serve as a container during casting.

Also, when a large current flows to the drive coil 4, the drive coil 4
acts as a reinforcing material against the force that tends to spread in the circumferential direction.

The fixed electrode 1 is provided with a hollow portion 24, a magnetic metal body 6 for guiding magnetic flux is inserted into the hollow portion, and the fixed electrode support conductor 16 is screwed into the fixed electrode 1 from above, thereby fixing the magnetic metal body 6.

Furthermore, the fixed electrode 1 is provided with a ring-shaped current-carrying part 25 at its lower end and a convex rectifying part 26 in the center, which guides the gas flow by interaction with the rectifying part 29 of the movable electrode 3, which will be described below. It serves to transfer the arc 5-1 to the fixed arc electrode 2.

Reference numeral 3 denotes a movable electrode which, as shown in FIG. 7, has a substantially parabolic shape and is made of a conductive material such as copper.

A spiral notch 27 is provided in the movable electrode 3, and the arc serves to extend and rise along this notch, and fresh arc-extinguishing gas is sent to the exchange space through this notch to cool the arc. At the same time, it also plays the role of accelerating upward.

A ring-shaped current-carrying part 28 is provided at the upper end of the central part of the movable electrode 3, and a concave rectifying part 29 is provided, which serves to transfer the arc to the fixed arc electrode 2 by interaction with the rectifying part 26 of the fixed electrode 1. do.

The upper end of the movable electrode 3 is connected to a short-circuit ring 30.9 When cut off, a force in the cutting direction is obtained by electromagnetic repulsion with the drive coil 4, and a magnetic field created by a circulating current generated by magnetic flux interlinking with this generates a magnetic field in the drive coil 40. It serves to strengthen the magnetic field.

When the drive coil 4 is turned on, no current is commutated to the drive coil 4, so it is not subjected to electromagnetic repulsion.

Therefore, the operating device is of the lJS type.

In addition, the buffer device 9 only serves to commutate the arc from the fixed electrode 1 to the fixed arc electrode 2.
Something small is fine.

Next, the process of cutting off the current by the above device will be explained.

In response to a cutoff command, an operation device (not shown) initiates a cutoff operation, and as shown in FIG.
1 occurs.

This arc 5-1 is subjected to the free looping action, the blowing of the gas G□ passing through the rectifying section 26.29 of the arc-extinguishing gas 21 compressed by the buffer device 9 provided as necessary, and is also driven. Due to the fact that the inductance of the coil 4 is small, the arc easily jumps between the fixed arc electrode 2 and the movable electrode 3, forming an arc 5-2.

Here, the current path is as follows: fixed electrode support conductor 16 → fixed electrode flange 19 → drive coil 4 → fixed arc electrode 2 → arc 5-2 → movable electrode 3 → movable electrode shell 17 → current collector contact 18
As a result, a magnetic field (2) is generated by the drive coil 4.

The arc 5-2 is rotated at high speed by a horizontal magnetic field H3 of the magnetic field H generated by the drive coil 4, and is also driven by the action of a notch 270 provided in the movable electrode 3, a gas flow G2 from this notch, Due to the synergistic effect of the free looping action, the gas flow G1 from the buffer device 9, and the rising action of the hot gas, it is accelerated upward and becomes an arc 5-3.

In this portion, the arc 5-3 is rotated at high speed by the vertical magnetic field H4 of the magnetic field H generated by the drive coil 40, and continues to be accelerated upward due to the effect of the notch 27 and the effect of the upward gas flow.

During this period, a small current is extinguished at the initial arc 5-1 or 5-2 position, and even a large current is extinguished at the short-circuit ring 3 of the movable electrode 3.
The arc is extinguished by the time it reaches 0.

Note that FIG. 6 is a sectional view showing details of the l-anchor arc electrode, and FIG. 7 is a view showing details of the movable electrode.

4 to 7, 10 is a check valve, 11 is a compression spring, 14.15 is an airtight OIJ ring, 31 is an insulating cover, 32 is a hexagonal nut for fixing the fixed electrode support conductor 16, and 33 34 is a spring washer, 34 is an adsorbent provided in a sealed container, and 35 is a wire mesh for holding the adsorbent 34.

According to the first invention, the drive coil is wound vertically around a fixed cylindrical electrode, and fixed arc electrodes are arranged along the bottom and sides of the coil, and the arc electrode is Correspondingly, the movable electrode was extended to generate an arc at the fixed contact located at the bottom of the drive coil, and this was transferred to the fixed arc electrode, which was rotated from the bottom to the side of the drive coil. Of the magnetic fields generated, two directions, horizontal and vertical, can be used effectively, and the inductance of the drive coil is reduced, making it easier to commutate the current to the drive coil, resulting in a free looping effect. The arc can also easily transfer.

Since a magnetic metal body is placed in the center of the drive coil, the magnetic field is strong.

The fixed arc electrode is arranged in parallel with the drive coil, and since the movable electrode has a substantially parabolic cross section, the arc length is elongated as it is guided to the tip of the movable electrode, making it easier to extinguish the arc.

Since the fixed arc electrode is placed close to and parallel to the side of the drive coil, the new space is close to the drive coil (i.e. dimension W is small in Fig. 5), so the strongest part of the generated magnetic field can be used, and that is all. A large driving force can be obtained.

The circulating current generated in the shorting ring at the extending tip of the movable electrode assists the breaking operation force and strengthens the magnetic field in the longitudinal direction.After the breaking is completed, the shorting ring acts as a shield ring to relax the electric field around the breaking part. It has the effect of obtaining a total of 9.

According to the second invention, the blown gas is effectively rectified by the flow rectifier, and the arc generated on the fixed electrode located on the outer periphery of the fixed electrode is more easily transferred to the fixed arc electrode, so that the rotational driving force of the arc can be quickly obtained. It's effective.

[Brief explanation of the drawing]

Figures 1 to 3 are side sectional views showing different conventional devices;
FIG. 4 is a side cross-sectional view showing an embodiment of the present invention in a closed state; FIG. 5 is an enlarged side cross-sectional view of the breaker in FIG. 4, showing a state in the middle of shutting off; Fig. 6 is an enlarged view showing the fixed arc electrode in Fig. 4, A is a top view, the mouth is a side sectional view, and Fig. 7 is an enlarged view showing the movable electrode in Fig. 4. A is a top view;
The mouth is a partially cutaway side view. 1...Fixed electrode, 2...Fixed arc electrode, 3...
Movable electrode, 4... Drive coil, 5... Arc, 6,
7... Magnetic metal L 8... Buffer chamber, 9...
Buffer device, 10... Check valve, 11... Compression spring, 12... Upper flange, 13... Lower flange, 14, 15... O-ring, 16... Fixed electrode supporting conductor, 17... Movable electrode rod, 18... Current collector contact,
19... Fixed electrode flange, 20... Insulating cylinder, 21
... Arc-extinguishing gas, 22 ... Fixed arc electrode notch,
23... Casting resin, 24... Fixed electrode hollow part, 25
...Fixed electrode current-carrying section, 26...Fixed electrode rectification section, 2
7...Movable electrode notch, 28...Movable electrode energizing part,
29... Movable electrode rectifier, 30... Short circuit ring, 31...
... Insulation cover, 32 ... Hexagonal nut, 33 ... Spring washer, 34 ... Adsorbent, 35 ... Wire mesh, H ~ Pulling
...Magnetic field, G1. G2...Gas flow.

Claims (1)

[Claims] 1. A fixed electrode support conductor introduced into a closed container sealed with arc-extinguishing gas, a cylindrical shape with a bottom attached to the support conductor, and a ring-shaped current-carrying part around the bottom. The formed fixed electrode, the magnetic metal body housed inside this cylindrical fixed electrode, and the fixed electrode that is wound vertically around the fixed electrode, one end of which is a flange provided on this fixed electrode, and the other end of which is a fixed arc described later. A drive coil connected to each electrode, an arc electrode arranged in parallel close to the side surface of the drive coil and whose end is bent to form a gap with the current-carrying part of the fixed electrode, and the fixed electrode. A movable electrode has a ring-shaped current-carrying part that comes into contact with and separates from the current-carrying part of the movable electrode, which is opposed to the arc electrode, has a substantially parabolic cross section, is provided with a spiral cutout, and has a short-circuit ring formed at the upper end. Gas breaker. 2. A fixed electrode support conductor introduced into an airtight container sealed with arc-extinguishing gas, a cylindrical fixed electrode with a bottom and a ring-shaped current-carrying part formed around the bottom, and a fixed electrode attached to the support conductor. A magnetic metal body housed inside a cylindrical fixed electrode, wound vertically around the fixed electrode, one end connected to a flange provided on the fixed electrode, and the other end connected to a fixed arc electrode described later. a drive coil, an arc electrode arranged in parallel close to the side part of the drive coil with its end bent to form a gap with the current-carrying part of the fixed electrode, and connected to the current-carrying part of the fixed electrode. A movable electrode having a ring-shaped energizing part that separates the electrode, facing the arc electrode, having a substantially parabolic cross section, a spiral cutout, and a short-circuit ring formed at the upper end; A flow regulator provided at the center bottom blows out arc-extinguishing gas from the upper end of the center portion of the movable electrode toward the outer periphery to assist the transfer of the arc generated between the fixed electrode and the movable electrode to the fixed arc electrode. A gas breaker consisting of a buffer device.