JPS5858773B2 - Heyretsu Teikoutuki Yadanki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved circuit breaker having resistive contacts in parallel with the main contact portion of the circuit breaker.

Generally, in a circuit breaker with a parallel resistance, a resistor is usually installed in parallel with the upper breaker, and the resistance current The above-mentioned influence is avoided by making the main cut-off part cut off after a certain period of time.

In addition, there are cases where a resistor is connected before the main breaker when turning on, and it can be said that it is common that a resistor is installed in parallel to these main contact points even if they fall over.

The two breaker sections of such a conventional circuit breaker with parallel resistance are electrical circuits as shown in FIG.

Sl is a main contact, S2 is a resistance contact, and R is a parallel resistance.

In FIG. 1, when both the main contact S1 and the resistance contact S2 are closed, the potentials are all the same in the range shown in the figure.

On the other hand, when the main contact S1 is open and the resistance contact S2 is closed, the potential at point P matches that at point A.

Further, when both Sl and S2 are open, the potential at point P matches that at point B.

In other words, the potential at point P changes to point B by opening or closing S2.
Alternatively, since it becomes point A, the electrical insulation distance around point P and 81 must be made commensurate with that of resistor R.

Figure 2 shows this relationship more graphically.
It is necessary that D be commensurate with the dielectric strength of the resistor R.

Therefore, the radial dimension of the entire charging group of the breaker's breaker becomes larger by an amount commensurate with the insulation strength of the resistor R, which is particularly uneconomical in grounded tank-type circuit breakers because the tank size increases. .

Furthermore, the positions of 81 and 82 were often shifted to either the left or right in the diagram, which worsened the electric field distribution when both Sl and S2 were open, which also caused the problem that D could not be reduced. .

Furthermore, in a structure in which the above-mentioned resistor R is arranged only on one side of the resistance contact S2, the resistor becomes longer in the axial direction than the main contact, which has the disadvantage of increasing the total length of the interrupting portion.

In order to eliminate this drawback, it is conceivable to divide and arrange the resistors on both sides of the resistive contact.

That is, the structure is such that a part of the resistor is placed on the other side of the resistor contact so that the resistor does not protrude significantly from the main contact.

With this configuration, it is possible to shorten the axial length of the heat sink part, but if the resistor is divided simply to shorten the axial length, as in the case of FIG. 1 described above, The potential at point P changes greatly depending on whether the resistance contact is opened or closed.

This sigh P and the electrical insulation distance around the main contact must be commensurate with the electrical insulation distance of the divided resistors.

Further, an insulation distance is required depending on the insulation strength around the main contact and around the resistance contact, which has the drawback of increasing the radial dimension.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a breaker having a breaker in which the parallel resistance and the resistance contact can be arranged relatively close to the main contact, and in particular the earthing tank can be downsized.

The present invention will be explained below with reference to FIGS. 3 to 7.

FIG. 3 shows the electric circuit of the -breaker section of the present invention.
The resistors Ra and Rb are, for example, resistors obtained by dividing the resistor R shown in FIG.

In this case, as is clear from the figure, among the potentials around S2, the potential at point Pa is the same potential as point A when S2 is open, and when S2 is closed, points A and B are at an intermediate point. The potential is .

Further, when S2 is open, point Pb has the same potential as point B, and when S2 is closed, the potential between points A and B is intermediate.

In other words, even if the difference between the potential around the resistance contact S2 and the potential around the main contact S1 is maximum, the difference in the case shown in FIG. Compared to the case of , it is possible to shorten the term to liability.

Furthermore, as shown in Fig. 4, it is easy to arrange S and 82 in parallel at the same position, and the potential distribution in the cut-off state where both Sl and S2 are open becomes reasonable.
This is a preferable arrangement in terms of insulation properties.

FIG. 5 is a partial vertical sectional view of a circuit breaker according to an embodiment of the present invention.

The hermetically grounded container 10 has both openings of the container 11 covered with lids 12 and 12.
The terminals 14 and 14 are sealed and supported by insulators 13 and 13 at both ends, and a cylindrical flange part 15 is installed on the operating mechanism part 16, a part of which is shown in the figure. There is.

The inside of the sealed grounded container 10 is filled with SF6 gas, and the container 1
1 near the center of the charging member 18.
and the terminal plate 19.1 of this breaking section 1γ, 17
9 are connected to both terminals 14 and 14, respectively.

A link mechanism 20 for operating the cutoff portion 17.17 is built into the charging member 18, and a lower opening 21 of the charging member 18 is installed on the flange intermediate metal fitting 23 of the flange portion 15 by means of a support insulating cylinder 22.

The link mechanism 20 and the operating mechanism section 16 are connected to each other via the insulating operating rod 24 that passes through the opening 21 and the hollow part of the insulating tube 22.
are connected.

The breaker section 17 has a main contact section 25 and a resistance contact section 26 connected in parallel, and a main contact section 2 near the main contact section 25.
A resistive contact portion 26 is arranged substantially parallel to 5.

When this breaker is turned on, the energizing path is terminal 14, terminal board 1
9, a breaker 1γ, a charging member 18, a breaker 17, a terminal plate 19, and a terminal 14.

Although not shown in the figure, a double pressure type or a buffer type method can be adopted for gas arc extinguishing at the breaker.

As shown in FIGS. 6 and 7, one breaker 17 has a resistance contact 26 and a main contact 25 connected in parallel by a terminal plate 19 and a charging member 18.

The resistance contact section 26 connects a fixed contact 31 with a wipe mechanism section 30 composed of a cylinder, a piston, and a compression spring, and a movable contact 32 that contacts a slide contact 33 to the terminal plate 19 and the charging member via a resistor 35, respectively. 18 , and this contact portion is surrounded by an insulating tube 36 .

The main contact portion 25 also includes a movable contact 41 that comes into contact with a fixed contact 40 and a slide contact 42, and this contact portion is surrounded by an insulating tube 43.

In this way, the movable contacts 32, 41 of the resistance contact section 26 and the main contact section 25 are connected via the link mechanism section 20, and are driven via the insulated operation rod 24 connected to an operation mechanism section (not shown). be done.

Next, the operation of the present invention will be explained.

As already explained in FIGS. 3 and 4, the resistive contact part 2
The insulation distance between the main contact section 25 and the resistance contact section 26 is reduced by installing resistors whose resistances required for 6 are almost blue as resistors 35 and 35 on the fixed contact 31 side and the movable contact 32 side, respectively. .

That is, since the breaker portion 17 is reduced in size, the entire breaker shown in FIG. 5 can be made smaller.

Another embodiment of the present invention will be described with reference to FIGS. 8 to 10.

A breaker of 500 kV or higher has a new multiple-breaker structure, and each breaker point is equipped with a parallel capacitor to improve voltage distribution.

In this case, as the number of multiple cutoff points increases, the required capacitor capacity also increases, and therefore the cutoff unit becomes larger.

Furthermore, ceramic resistors, so-called resistance discs, are often used for the input resistor itself due to its heat capacity, but the sides of the resistance disc have many irregularities, which is one of the factors that increases the size of the grounding container.

As shown in FIG.
and a resistance contact section 26 in parallel with this, and both are connected to an operating mechanism section (not shown) through an insulated operating rod 24 and a link mechanism section 201, respectively, and can be operated in conjunction with each other.

The resistance contact section 26 is divided into resistors 55 and 56, which are almost the same as the resistors necessary for the parallel resistance contact section of one breaker section, and the resistor 55 has a fixed contact 31 with a wipe mechanism section 50 and a terminal section 19. It is fixed by an insulating stud 57 between the two.

The resistance movable contact 32 facing this is connected to an insulating rod 52 and passes through the hollow part of the resistor 56, and the resistor 56 is fixed between the presser foot 60 and the charging end plate 61 via an insulating stud 57. There is.

When this breaker is in the closed state, the current flow path is at terminal 19.
, resistor 55, wiper mechanism section 30, fixed contact 31. These are the movable contact 32, the slide contact 33, the presser foot 60, the resistor 56, the charging end plate 61, and the charging member 18. 41. The slide contact 42 becomes the charging member 18.

Further, in the main contact portion 25, an insulating cylinder 50 surrounding the fixed contact 40 and the movable contact 41 is fixed between the end plate 19 and the charging member 18, and the resistance contact portion 26 is fixed between the end plate 19 and the charging end plate 61. An insulating cylinder 51 surrounding resistors 55 and 56 is fixed to the fixed contact and the movable contact.

Next, these functions and effects will be explained.

Since the resistors 55 and 56 are arranged on both sides of the resistive contact, the insulation distance between the main contact and the resistive contact is reduced.

The voltage resistance of the insulating rod 52 penetrating the middle part of the resistor 56 is required at the moment of turning on, that is, when the resistor 56
However, since the insulating rod 52 is placed in the hollow part of the resistor 56, the electric field of the insulating rod 52 is controlled by the resistor 561, resulting in a nearly uniform electric field. No shield etc. required.

A potential distribution control capacitor can be used instead of the insulating tube provided between the two contacts.

This is a capacitor having distributed capacitance by inserting a metal foil or the like into the cylindrical portion of an insulating tube, and this embodiment will be explained with reference to FIGS. 9 to 11.

In FIG. 9, a capacitor 70 is provided in the resistive contact section 26, and by accommodating the contact section and the resistor, the inherent difference in electric field distribution due to the difference in shape between the contact itself and the main contact can be prevented from affecting between the two contacts. The prevention potential distribution is controlled and the entire interrupting portion 17 is reduced in size.

In FIG. 10, capacitors 70 and 71 are provided in each of the resistance contact portion and the main contact portion.

As described above, according to the present invention, approximately two resistors necessary for one main contact part are installed in the resistance contact part parallel to one main contact part.
By installing equally divided resistors on the fixed contact side and the movable contact side of the resistive contact portion, the insulation distance between the main contact portion and the resistive contact portion can be reduced to approximately half of the conventional one.

Further, it is easy to match the relative positions of both contacts of both contact portions, which is advantageous in terms of insulation.

Furthermore, the electric field of the insulating rod can be controlled by passing the movable contact of the resistance contact portion and the insulating rod that operates the movable contact through the hollow portion of the resistor.

Furthermore, by surrounding at least one of the contact portions with a cylindrical capacitor formed by inserting metal foil,
It is possible to control the inherent difference in electric field distribution due to the difference in the shape of the contact between the two contacts, thereby reducing the insulation distance between the two contact parts, thereby providing a breaker with parallel resistance that can be easily miniaturized.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the electric circuit of the conventional breaker, FIGS. 3 and 4 are explanatory diagrams of the electric circuit of the breaker of the present invention, and FIG. 5 is a partial longitudinal section of the breaker of the present invention. 6 is a longitudinal sectional view of one of the breaking parts of the present invention, and FIG. 7 is a 1--1 of FIG.
8 to 10 are cross-sectional views of other embodiments of the present invention. 10... Sealed grounded container, 11... Container, 12... Lid, 13... Insulator, 14
...Terminal, 15...Flange part, 16
......Operating mechanism section, 17...... Shutoff section,
18... Charging member, 19... Terminal board,
20... Link mechanism section, 22... Support insulating cylinder, 24... Insulated operation rod, 25...
...Main contact part, 26... Resistance contact part, 30.
...Wipe mechanism section, 31...Resistance fixed contact, 32...Resistance movable contact, 33...
Slide contact, 35... Resistor, 36.
...Insulation cylinder, 40 ...Main fixed contact, 41
...Main movable contact, 42...Slide contact, 43...Insulation cylinder, 50...
Insulating tube of main contact part, 51...Insulating tube of resistance contact part, 52...Insulating rod, 55...Fixed side resistor, 56... Movable side resistor, 57...
...Insulating stud of resistor, 60... Holder, 61... Charging end plate, 70, 71...
・Capacitor with metal foil.

Claims (1)

[Scope of Claims] 1. A resistive contact and a resistor that are electrically connected in parallel to the main contact and that are opened and closed prior to the opening and closing of at least one main contact that is arranged in a closed container filled with an arc-extinguishing gas. In the circuit breaker with parallel resistance, the resistor required for the one main contact is roughly divided into two, and the first and second resistors are divided into a movable side and a fixed side of the resistance contact. A circuit breaker with a parallel resistance, wherein the resistor and the resistance contact are arranged substantially parallel to the opening direction of the main contact. 2. A resistance contact section consisting of a resistance contact electrically connected in parallel to the main contact and a resistor, which is opened and closed prior to the opening and closing of at least one main contact arranged in a closed container filled with arc-extinguishing gas. In the circuit breaker with parallel resistance, the resistor necessary for the one main contact is divided into approximately two equal parts, and the first and second resistors are divided into a movable side and a fixed side of the resistance contact. The resistor and the resistive contact are arranged substantially parallel to the opening direction of the main contact, and at least one of the main contact and the resistive contact is connected in parallel to each contact. A breaker with parallel resistance characterized by being surrounded by a capacitor.