JPH0268826A - Three phase package type gas circuit breaker - Google Patents

Abstract

PURPOSE:To make it possible to obtain a compact, highly reliable, large- capacity, single-break gas circuit breaker by reducing the outside diameter of individual containers through the accommodation of input resistance contact point parts for three phases in a container separate from that for the main contact point for three phases. CONSTITUTION:An arc extinguish chamber 30 for three phases, possessing No. 1 movable electrode and No. 2 movable electrode, is housed in an arc chamber housing container 31. Beside the arc chamber housing container 31, a separate container, an input resistance contact point housing container 40 is provided. The housing container 40 is connected, through openings 41, 42 formed on the top and bottom of its side, with openings 39, 52 formed on the side of the arc extinguish chamber housing container 31. Input resistance contact point parts for three phases are installed inside the input resistance contact point housing container 40. The housing of the main contact point for three phases and the input resistance contact point part in separate containers made it possible to break a large capacity and to obtain a compact circuit breaker.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Field of Industrial Application) The present invention relates to a large-capacity one-off/closing contact, for example, a 550KV system, and a three-phase collective type gas circuit breaker with a closing resistor. It is.

(Prior Art) As the capacity of power transmission systems increases, the breaking capacity of circuit breakers used in substations and switchyards increases, and high reliability is required. In order to improve the reliability of circuit breakers, it is important to reduce the number of parts and simplify the structure. Therefore, efforts are being made to reduce the number of breaking points of circuit breakers. For example, currently in the 550 KV system, a two-point circuit breaker with a breaking current of 50 KA is in practical use, but there is a general demand for converting this to one-point circuit breaker. At the same time, in order to suppress the increase in the size of circuit breakers or gas-insulated switchgear using them due to the increase in capacity, we have developed a three-phase integrated gas system that incorporates three-phase circuit breakers into a single sealed container. Circuit breakers have also been proposed, and even with such three-phase bulk gas circuit breakers, each circuit breaker is
It is requested that it be cut into points.

By the way, in order to improve the arc extinguishing performance when cutting a large-capacity circuit breaker with one point, it is necessary to make the homopolar speed much faster than with a conventional two-point breaking circuit breaker. There is. Therefore, unlike conventional circuit breakers, which have a fixed electrode and a movable electrode facing it, and only move the movable N pole when opening, the circuit breaker opens by simultaneously moving two opposing electrodes. A circuit breaker called According to this double-motion type circuit breaker, although the moving speed of each electrode is the same as that of a conventional circuit breaker, the opening speed is much faster and the arc extinguishing performance is improved.

An example of such a double motion type circuit breaker is shown in the fourth example.
As shown in FIG.

In this figure, 1 is a first movable electrode, and 10 is a second movable electrode (corresponding to a conventional fixed electrode). The first movable PJX 1 is provided at the tip of the buffer cylinder 2, and an insulating nozzle 3 and a movable current-carrying contact 4 are arranged concentrically around its outer periphery.

An operating rod 5 is fixed to the center of the buffer cylinder 2, and the operating rod 5 is connected to a mechanism (not shown) via an insulating rod 6. A buffer piston 8 fixedly supported by an insulating cylinder 7 is inserted inside the buffer cylinder 2, and a space surrounded by the buffer piston 8 and the buffer cylinder 2 forms a pan foot 9.

The second movable electrode 10 is provided so as to protrude from the center of the face of the current-carrying cylinder 11 facing the first movable electrode 1, and is inserted into the insulating nozzle 3 and the first movable electrode 1. On the outer periphery of the second movable electrode 10, there is a second movable current-carrying contact 12 that contacts the movable current-carrying contact 4 of the first movable electrode.
A movable shield 13 is provided. The current-carrying cylinder 11 that supports these second movable electrodes 10 is slidably inserted into the current-carrying conductor 14 at its base, and at the same time an insulating rod 15 and a link are provided outside the first movable electrode 1. It is connected via a mechanism 16 to the base of the operating rod 5 that drives the first movable electrode 1 . This link mechanism 1
Reference numeral 6 denotes first and second connecting rods 15b and 16G rotatably connected to both ends of the link 16a, and the link 1.
It is composed of a link support part 16d that supports the link 6a. The link 16a rotates around the link support 16e, which is set at a predetermined link ratio, about the fulcrum 16e of the link support 16d.
It is rotatably supported with respect to 6d.

Further, each of the 1.12(7) connecting rods 16b and 16G is rotatably connected to the operating rod 5 and the insulating rod 15 at one end of each. Note that the link support portion 16d is
It is fixed to an insulating tube 9 that is insulated and fixed to a container (not shown).

In the double-motion circuit breaker configured in this way, when the operating mechanism (not shown) is driven in the closed state shown in FIG. 4, the operating rod 5 moves at a predetermined speed toward the operating mechanism
The first movable electrode 1 fixed to the tip thereof moves rightward, and a disconnection operation is performed between the first movable electrode 1 and the second movable electrode 10. On the other hand, as the operating rod 5 moves, the link machine 116 connected thereto is driven, and the insulating rod 15 is moved to the side opposite to the operating rod 5 (to the left in the figure). As a result, the current-carrying cylinder 11 and the second movable electrode 10 fixed to the tip of the insulating rod 15 move in the opposite direction to the first movable electrode 1 (to the left in the figure). Furthermore, as the operating rod 5 moves, the buff 1 cylinder 2 fixed at its tip moves relative to the buff 7 piston 8 fixed to the insulating cylinder 9, and the buffer chamber 9 is compressed. The arc gas is guided by the insulating nozzle 3 and blown between the first and second electrodes, which are separated, thereby extinguishing the arc.

Note that the closing operation is performed by driving the operating rod 5 in the opposite direction to the closing operation.
10 relatively close together.

In this way, in a double-motion type circuit breaker, although the moving speed of the operating rod 5 is similar to that of a conventional circuit breaker, since it drives both the first and second movable electrodes 1. The relative opening speed between them is improved by about twice, and even a large-capacity circuit breaker can be disconnected at one point.

(Problems to be Solved by the Invention) By the way, in circuit breakers for lines in large-capacity systems such as 550 KV class, a closing resistance method is adopted in order to suppress the closing overvoltage at the time of closing. In this system, a closing resistance contact with a closing resistance is installed in parallel with the main contact of the circuit breaker, and when the circuit breaker is closed, this closing resistance contact is closed before the main contact, and the closing overvoltage is suppressed by the closing resistance. is input. In this method, when opening, it is necessary to first open the closing resistance contact and then open the main contact.

When this closing resistance contact is used in the above-mentioned double-motion type circuit breaker, the major problems are the reduction of switching overvoltage and the miniaturization of the circuit breaker and the entire gas-insulated switchgear that employs it, and it is difficult to solve these problems. This is an important issue.

First, Figure 6 shows the insulation recovery characteristics between the closing contact and the arc extinguishing chamber (main contact) per point of a conventional 550KV class two-point circuit breaker, and the closing contact and extinguishing point of a 550KV class single-point circuit breaker. The insulation recovery characteristics of the arc chamber are shown.

As is clear from this figure, in the 55 OKV class single-point circuit breaker, the opening speed of both the main contact and the closing resistance contact is faster than in the case of each one point of 02-point disconnection.

■When opening, the insulation recovery speed of the closing resistance contact is faster than the insulation recovery speed of the main contact.

■When closing, the closing resistance contact is closed before the main contact.

It is necessary to satisfy the following conditions.

However, in conventional circuit breakers in which only one electrode is movable, the movable electrode and the closing resistance contact are moved simultaneously at the same speed using the same drive source, and the timing of opening or closing of both depends on the shape of the electrode. (The main contact has an electrode structure using a wipe, while the closing resistance contact uses a butt contact using a spring.)

However, in the double motion system adopted for 550KV class single-break circuit breakers, the picture electrodes move simultaneously at the main contact, so the closing resistor contact opens at the same speed as the opening speed of the main contact, unlike conventional circuit breakers. When the closing resistance contact is moved, the closing or opening speed of the closing resistance contact becomes approximately 1/2 of that of the main contact. The problem arises that it cannot be done. Moreover, this type of circuit breaker uses a buffer type gas circuit breaker that sprays arc-extinguishing gas between the electrodes of the main contact when opening, whereas the closing resistance contact Since arc-extinguishing gas is not sprayed, it has been difficult for this reason to make the insulation recovery speed of the closing resistance contact faster than that of the main contact.

In addition, in conventional circuit breakers with closing resistance contacts,
Because the arc extinguishing chamber housing the main contact and the closing resistor contact were housed in the same container, the outer diameter of the entire container became large, and at the same time, the entire gas-insulated switchgear using this also became larger. . In particular, a three-phase finger-type gas circuit breaker with a closing resistance contact requires both the closing resistance contact and the main contact for three phases, which are housed in a single sealed container, so the container is very large. This is not only effective because it is difficult to manufacture and process the container itself, but also has the disadvantage of increasing the size of the entire gas-insulated switchgear to which it is connected.

For example, FIG. 7 is a plan view of a gas insulated switchgear using three-phase finger-shaped gas circuit breakers housed in the same container. , when connecting to a three-phase finger-shaped gas circuit breaker 23 with a closing resistance contact via a disconnector 22, and connecting this to the bushings 25 of each phase on the line side via a current transformer 24, If the external diameter of the container of the interdigital gas circuit breaker 23 is large, the dimension between the bus bar 20 and the bushing 25 becomes large, which has the drawback of increasing the space occupied by the gas insulated switchgear.

Roughly speaking, a three-phase finger type gas circuit breaker with a closing resistance contact is
A type of circuit breaker that does not require a closing resistor contact is used for normal line circuits, and a type of circuit breaker without a closing resistor contact is used for other circuits. However, since a container large enough to accommodate the closing resistance contact was commonly used, the increase in occupied space was a problem in other parts of the gas insulated switchgear as well.

The present invention solves the problems of the prior art as described above, is miniaturized, and contributes miraculously to the downsizing of the entire gas-insulated switchgear,
Moreover, it is an object to provide a highly reliable, large-capacity single-break three-phase finger-shaped gas circuit breaker that can reduce the closing overvoltage at the time of closing and improve the insulation recovery speed of the closing resistance contact at the time of opening or closing. With the goal.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the three-phase finger-shaped gas circuit breaker of the present invention has first and second movable movable parts inside the arc extinguishing chamber storage container. An arc-extinguishing chamber for three phases having electrodes is housed, and a fixed-side electrode, a movable-side electrode, and an arc-extinguishing chamber for these electrodes are housed inside a making resistance contact storage container configured separately from the arc-extinguishing chamber storage container. A three-phase closing resistance contact section consisting of a connected closing resistor is housed, and the arc extinguishing chamber and the closing resistance contact for each phase inside each sealed container are electrically connected to each other through the conductor of each phase. A structural feature is that they are connected.

(Function) In the present invention having the above-described configuration, the closing resistance contact portion for the three phases is housed in the disconnector, which is different from the main contact for the three phases, so that the outer diameter of each container can be reduced. By arranging these two containers parallel to the busbar, the distance between the busbar and the bushing can be shortened, and the space occupied by the gas-insulated switchgear can be reduced.

In general, a three-phase finger-shaped gas circuit breaker with a small-diameter container housing only the main contact can be used for lines that do not require a resistor closing contact, which contributes to the downsizing of the gas-insulated switchgear.

(Example) Hereinafter, one example of the three-phase finger-shaped gas circuit breaker of the present invention will be described as a first example.
This will be explained in detail with reference to FIGS. 3 to 3.

Incidentally, the same members as those of the conventional circuit breaker shown in FIG. Also, since Figure 1 is a cross-sectional view, the main contacts and closing resistance contacts for the three phases are shown, and the contacts for the negative phase are not shown, but each container contains the main contacts and closing resistance contacts for the three phases. Each contact is stored.

In this embodiment, the first movable electrode 1 and the second movable electrode 10
The three-phase arc extinguishing chamber 30 having three phases is housed in one arc extinguishing chamber storage container 31. The first movable electrode 1 of each phase located below the arc extinguishing L30 of each phase is connected to the arc extinguishing chamber storage container 31.
It is electrically connected to conductors 33 of each phase drawn out to the outside (to other equipment side of the gas insulated switchgear) from an outlet 32 on the lower side surface of the gas insulated switchgear. In addition, the arc extinction W30 of each phase is
It is supported by insulating cylinders 9 of each phase on an operating mechanism box 34 in which an arc extinguishing chamber storage container 31 is installed. Arc extinguishing chamber 30 for each phase
The operating rod 5 that drives each movable electrode 1, 1o is extended into the operating mechanism box 34 via an insulating rod 6,
They are respectively connected to the operating rods 36 of the arc extinguishing chamber operating cylinders 35 of each phase provided therein. On the other hand, the second movable electrode 10 of each phase is located above the arc extinguishing chamber 30 of each phase.
The conductors 3 of each phase are drawn out from the outlet 37 provided at the upper part of the arc extinguishing chamber storage container 31 via the current-carrying conductor 14.
8 respectively.

On the side of the arc extinguishing chamber storage container 31 as described above, there is provided a closing resistance contact storage container 40 which serves as a disconnector. This storage container 40 is connected to an opening 39.52 formed in the side surface of the arc-extinguishing chamber storage container 31 at openings 41.42 provided on the upper and lower sides of the side surface. In the making resistance contact storage container 40, making resistance contact portions for three phases are provided. That is, the closing resistance contact portion of each phase is composed of a closing resistor 43, a closing contact fixed side electrode 44, a spring 45 for its return, and a closing contact movable side electrode 46 facing the closing contact fixed side electrode 44. There is.

Of these, the fixed side electrodes 44 of each phase are connected via respective closing resistors 43 to the conductors 38 of each phase connected to the second movable electrode 10 of the arc extinguishing chamber. Moreover, the movable side electrode 46 of each phase is connected to the conductor 33 of each phase connected to the first movable electrode 1 of the arc extinguishing chamber! The base of the movable side electrode 46 of each phase is electrically connected via the training section 47, and the base of the movable side electrode 46 of each phase is connected to the closing resistance contact operation cylinder 50 of each phase in the operation mechanism box 34 by an insulating rod 48 and an operation rod 49, respectively. It is connected to the.

The closing resistance contact operating cylinder 50 of each phase is connected to the above-mentioned arc extinguishing chamber operating cylinder 35 of each phase by the respective hydraulic piping 51, so that it is driven synchronously, and the driving speed of the operating rod 49 of each phase is controlled. is set to be at least twice the driving speed of the operating rod 36 of the arc extinguishing chamber operating cylinder 35.

In addition, in this embodiment, the conductor 38 of each phase, which is arranged on the upper part of each storage container 31, 40 and connects the second movable electrode 10 of each phase and the fixed side electrode 44 of the closing resistance contact, is stored in the arc extinguishing chamber. From the outlet 37 at the top of the container 31, and from each storage container 31.
The conductor 33 of each phase, which connects the first movable electrode 1 of each phase and the movable side electrode 46 of the making resistance contact, is connected to the outlet 3 provided at the bottom of the making resistance contact storage container 40.
2 and is connected to other equipment constituting the gas insulated switchgear. Furthermore, insulating spacers 53, 54 are provided at each outlet 32, 37 of these storage containers to support the conductor 33, 38 and separate it from other equipment.

The operation of this embodiment, which has the above-described configuration, will be explained.

When a three-phase-batch closing command is input in the open state shown in FIG. 1, the arc extinguishing chamber operation cylinder 35 and closing resistance contact operation cylinder 50 of each phase, which are driven synchronously, are driven to operate each phase. Rondo 36.49 starts moving to the input side. At this time, the arc extinguishing chamber 30 is operated by the operating rod 36 on the arc extinguishing chamber side of each phase.
As described in the prior art, the first movable electrode 1 and the second movable electrode 10 are driven in opposite directions by the link mechanism 16, so the relative input speed of the two is controlled by the operating rod 3.
The driving speed is approximately twice as high as that of No. 6. - On the other hand, in order to suppress overvoltage at the time of closing, the closing resistance contact side of each phase should be
Although it is necessary to close the arc extinguishing chamber 30 earlier than the high-speed closing of the arc extinguishing chamber 30 as described above, in this embodiment, the closing resistance contact operating cylinder 50 of each phase moves its operating rod 49 to the arc extinguishing chamber 30. Since it is driven at a faster speed than the relative speed of the first and second movable electrodes 1 and 10 within the chamber, the closing resistance contact is always closed before the main contact of the arc extinguishing chamber. As a result, first, the movable side electrode 45 of the closing resistance contact of each phase is
contacts the fixed side electrode 44 and pushes it against the return spring 45, thereby removing the three-phase conductor 33.
．． 38 are simultaneously connected via the closing resistor 43, and then the main contact on the arc extinguishing chamber 30 side of each phase, which is slower than the closing speed of the closing resistance contact of each phase, closes as described in the prior art. Thus, the conductors 33 and 38 of each phase are electrically connected.

On the other hand, when opening the three-phase bracket, each operating cylinder 35.50 is driven in the opposite direction to the closing time, but in this case as well, the movable electrode 45 of the closing resistance contact is connected to the first Since the second movable electrodes 1 and 10 are separated at a higher speed than the relative separation speed of the second movable electrodes 1 and 10, the insulation recovery characteristics as shown in FIG. 6 of the prior art can be fully satisfied. That is, since the closing resistance contact portion of each phase is a butt contact, when the operating rod 48 is driven in the direction of separation, the movable side electrode 45 separates from the fixed side electrode 44. At this time, since the return speed of the return spring 45 of the fixed side electrode 44 is slower than the opening speed of the movable side electrode 45, the picture electrodes of each phase can be opened and separated immediately. - side, the first on the arc extinguishing chamber side of each phase.
Since the second movable electrodes 1 and 10 have a wipe structure, they do not open immediately even after the operation rod 36 starts opening, and as described above, they do not open immediately after the opening of the operating rod 36, and they can be opened at a certain timing from the closing resistance contact side, which is opened immediately as described above. The electrode can be opened after .

In this embodiment having the configuration and operation as described above, the following effects are exhibited.

■Since the opening speed of the three-phase closing resistor contact is greater than the relative opening speed of the three-phase main contact, the insulation recovery characteristics of the closing resistor contact are guaranteed to exceed those of the main contact. This improves the reliability of the equipment.

(2) Since the arc extinguishing chamber storage container 31 for three phases and the storage container 40 for the closing resistance contacts for three phases are made separate, it is possible to reduce the outer diameter of the container. As a result, as shown in FIGS. 2 and 3, in the three-phase finger-shaped gas circuit breaker of this embodiment, both containers were
If it is incorporated into a gas insulated switchgear so that it is parallel to , it becomes possible to reduce the dimensions of the connection between the bus bar and the bushing, and the size of the gas insulated switchgear becomes possible. In particular, when arranged as shown in Figure 2, the placement location of the making resistance contact storage container 40 is the space required to ensure the insulation distance of the bushings of each phase, and there is an advantage that the space can be used effectively. .

■The three-phase closing resistance contact storage container is separate from the three-phase arcing chamber storage container, so in locations where closing resistance contacts are not required other than for railroad lines, they can be stored in the arcing chamber storage container. Since it is only necessary to arrange circuit breakers having main contacts, it is possible to use a common container and downsize the gas insulated switchgear.

■The making resistor of each phase is arranged on the upper part of the making resistance contact storage container 40, and the movable side electrode 4 of the making resistance contact of each phase is arranged.
Since the operating rod 49 of No. 5 is directly connected to the operating cylinder 50, the structure is simple and highly reliable.

■ Hydraulic operation cylinders 50.35 are used as the drive source for the three-phase closing resistance contact and the main contact, and both are connected by hydraulic piping 51, making it easy to control each operation cylinder and controlling each contact. It is extremely easy to drive at different speeds, and it is also possible to open and close with precise timing.

■If the operating mechanism systems for the closing resistance contact section and the main contact are provided separately, even if there is a defect in one system, only the normal contacts will open or close, which may result in the breaker being destroyed. However, by interlocking the remote control cylinders with hydraulic piping, it is possible to eliminate the inconvenience of only one contact being opened or closed.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be widely applied to all three-phase finger-shaped gas circuit breakers in which the main contact opening/closing method is a double motion method. Also,
The operating mechanism for the main contact and the closing resistance contact is not limited to hydraulic pressure, but may also use other fluids or mechanical means using links.

[Effects of the Invention] As described above, according to the present invention, large-capacity interrupting is possible by storing the main contacts for three phases and the closing resistance contacts for three phases in separate containers. , it becomes possible to provide a highly reliable and compact three-phase finger-shaped gas circuit breaker.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the three-phase finger-shaped gas circuit breaker of the present invention, and Fig. 2 shows a state in which the three-phase finger-shaped gas circuit breaker of Fig. 1 is assembled into a gas-insulated switchgear. Figure 3 is a side view, and Figures 4 and 5 are the conventional double motion buff. A cross-sectional view showing one phase of a type gas circuit breaker.
FIG. 4 shows the closed state, and FIG. 5 shows the open state. FIG. 6 is a characteristic diagram showing the insulation recovery characteristics of the main contact and the closing resistance contact in a 550KV class single-break circuit breaker and two-point trip circuit breaker,
FIG. 7 is a plan view showing the problems of a gas insulated switchgear using a conventional three-phase finger type gas circuit breaker. 1... First movable electrode, 10... Second movable electrode, 20
... Main bus, 21... Disconnector, 22... Connection bus, 23... Circuit breaker, 24... Current transformer, 25... Bushing, 30... Arc extinguishing chamber, 31 ... Arc chamber storage container, 32 ... Outlet, 33 ... Conductor, 34 ...
Operation mechanism box, 35... Arc chamber operation cylinder, 36...
・Operation rod, 37... Outlet, 38... Conductor,
39, 41, 42.52... Opening, 40... Closing resistance contact storage container, 43... Closing resistor, 44...
Closing resistance fixed side electrode, 45... Closing resistance contact movable side electrode, 46... Return spring, 47... Sliding part,
48... Insulating rod, 49... Operating rod, 50...
... Closing resistance contact operation cylinder, 51... Hydraulic piping. Fig. ゛ljf /'B'I Fig. Fig. Fig. Fig. Fig. Fig. 112, 1: (Method) % formula% ?Relationship with the case to be corrected

Claims (1)

[Claims] (1) Three-phase arc extinguishing chambers having first and second movable electrodes are housed inside the arc extinguishing chamber storage container, and a closing resistance contact is configured separately from the arc extinguishing chamber storage container. Inside the storage container, three-phase closing resistance contacts are housed, each consisting of a fixed side electrode, a movable side electrode, and a closing resistor connected to these electrodes. A three-phase collective gas circuit breaker characterized in that the arc chamber and the closing resistance contact are electrically connected to each other through conductors of each phase.