JPH03165413A - Puffer type gas breaker - Google Patents

Abstract

PURPOSE:To reduce closing overvoltage at the time of closing, improve the insulation recovering speed of a closing resistant contact at the time of contact parting or closing, and miniaturize equipments by arranging a closing resistant body on one side back side of closing resistance contact electrodes. CONSTITUTION:Following the movement of an operation rod 5 making the opening action of main contact movable electrodes 1 and 10, the linking rod 22c of a link mechanism 22, linked to the operation rod 5 with a pin connection part 22b, is rotated to a breaking side. At that time, in the link ratio of each linking rod 22c and 22d, the part of closing resistant contact electrodes 21 and 24 acts prior to the actions of the electrodes 1 and 10. On the other hand at the time of closing, first the electrodes 21 and 24 are closed, a closing resistant body 29 is inserted in a circuit for a given time following the above closing, and then the closing of the electrodes 1 and 10 in an arc extinguishing chamber causes current to not flow in the closing resistant body 29.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a puffer type gas circuit breaker having a closing resistance contact and a closing resistance.

(Prior Art) In recent years, with the increase in the capacity of power transmission systems, the breaking capacity of circuit breakers used in substations and switchyards has increased, and high reliability has been required. In order to increase the reliability of such 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, in the current 550KV system, the breaking current is 50KV.
KA's two-point circuit breakers have been put into practical use, and there is a need to convert them to one-point circuit breakers.

By the way, in order to improve the arc extinguishing performance when converting such a large-capacity circuit breaker to one point, it is necessary to make the opening speed much faster than that of a conventional two-point circuit breaker. be. Therefore, unlike conventional circuit breakers, which have a fixed electrode and a movable electrode placed opposite to it and only move the movable electrode when opening, the circuit breaker is opened by simultaneously moving two opposing electrodes in opposite directions. , a so-called double-motion circuit breaker has been proposed. Although the movement speed of each electrode is the same as that of conventional circuit breakers, this double-motion circuit breaker has the advantage of significantly faster opening speed and greatly improved arc extinguishing performance. be.

An example of such a double motion circuit breaker is shown in FIGS. 6 and 7. In the figure, 1 is a first movable electrode for the main contact, and 10 is a second movable electrode for the main contact (corresponding to a conventional fixed electrode). This first movable electrode 1 for main contact is provided at the tip of a puffer cylinder 2, and an insulating nozzle 3 and a movable current-carrying contact 4 are arranged concentrically around its outer periphery.

Further, an operating rod 5 is fixed to the center of the buffer unlinder 2, and this operating rod 5 is connected to an operating mechanism section (not shown) via an insulating rod 6. Furthermore, a puffer piston 8 supported and fixed to an insulating cylinder 7 is inserted inside the puffer cylinder 2.
A space surrounded by the buffer unlinda 2 and the buffer unlinda 2 is a puffer chamber 9.

On the other hand, the second movable electrode 1o for main contact is provided in a protruding manner at the center of the face of the current-carrying cylinder 11 facing the first movable electrode 1 for main contact, and is provided inside the insulating nostle 3 and the first movable electrode 1 for main contact. Configured to be inserted. Further, a second movable current-carrying contact 12 and a second movable shield 13 are provided on the outer periphery of the second movable electrode for main contact 1°, which contacts the movable current-carrying contact 4 of the first movable electrode for main contact. ing. The current-carrying cylinder 11 supporting these second movable electrodes 1o for main contacts is slidably inserted into the current-carrying conductor 14 at its base, and at the same time is disposed outside of the first movable electrode 1 for main contacts. Through the insulating rod 15 and link mechanism 16,
It is connected to the base of the operating rod 5 that drives the first movable electrode 1 for main contact. This link mechanism 16 includes a link 16
It is comprised of first and second connecting rods 16b and 16c rotatably connected to both ends of the link a, and a link support portion 16d that supports the link 16a. The link 16a is
It is rotatably supported relative to the link support part 16cl around a fulcrum 16e of the link support part 16d set to a predetermined link ratio. In addition, each of the first and second connecting rods 1
6b and 16c are 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 fixed to an insulating tube 7 that is insulated and fixed to a container (not shown).

The double-motion circuit breaker configured in this way is
In the closed state shown in FIG. 6, when the operating mechanism (not shown) is driven, the operating rod 5 moves at a predetermined speed toward the operating mechanism (
The first movable electric kite 1 for main contact, which is fixed to the tip thereof, moves to the right and performs a breaking operation with the second movable electrode 1o for main contact. On the other hand, as the operating rod 5 moves, the link mechanism 1 connected thereto
6 is driven to move the insulating rod 15 to the side opposite to the operating rod 5 (left In+1 in the figure). As a result, the current-carrying cylinder 11 fixed to the tip of the insulating rod 15 and the second movable main contact electrode 10 move in the opposite direction (to the left in the figure) from the first movable main contact electrode 1.

Furthermore, as the operating rod 5 moves, the puffer cylinder 2 fixed at its tip moves relative to the puffer piston 8 fixed to the insulating cylinder 7, compressing the puffer chamber 9, so that the arc-extinguishing gas inside is guided by the insulating nozzle 3 and sprayed between the first and second electrodes for the main contact which are being opened, thereby performing an extinguishing and discharging action.

In addition, the closing operation is performed by driving the operating rod 5 in the opposite direction to the above-mentioned closing operation to close the first and second river electric terminals for the main contacts,
10 relatively close together.

In this way, in the double-motion type circuit breaker, although the operating speed of the operating rod 5 is similar to that of a conventional circuit breaker, both the main contact brush 1 and the second movable electrodes 1, 10 are moved in opposite directions. Because of this, the relative opening speed between both electrodes is approximately doubled, and even in large-capacity circuit breakers,
Point cutting becomes possible.

(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 that the making resistance contact first be opened, and then the main contact must be opened.

When this closing resistance method is adopted for the double-motion circuit breaker mentioned above, the major problems are the reduction of switching overvoltage and the miniaturization of the circuit breaker and the entire gas-insulated switchgear that uses it, and it is important to solve these problems. This is a serious issue.

First, Figure 8 shows the insulation recovery characteristics of the closing contact and main contact per point of a conventional (7) 550KVv1.2-point circuit breaker, and the insulation recovery of the closing contact and main contact of a 55OKV class single-point circuit breaker. The characteristics were shown. As is clear from the figure, 550K
In a V-class single-break circuit breaker, the opening speed of both the main contact and the closing resistance contact is faster than in the case of a two-point break at each point.

■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, so the timing of opening or closing of both is This was addressed by the difference in electrode shape (the main contact has an electrode structure using a wipe, while the closing resistance contact uses a butt contact using a spring).

However, in a double-motion circuit breaker that is used as a 550KV class single-break circuit breaker, the picture electrodes of the main contacts simultaneously move to the opposite side, so unlike conventional circuit breakers, the opening speed of the main contacts does not change. If the closing resistance contact is moved at the same speed, the closing speed or opening speed of the closing resistance contact will be
This is approximately 1/2 that of the main contact, and as mentioned in (1) and (2) above, there arises a problem that the closing speed or opening speed of the closing resistance contact cannot be made faster than that of the main contact. Furthermore, while this type of large-capacity circuit breaker employs a puffer-type gas circuit breaker that sprays arc-extinguishing gas between the electrodes of the main contact when opening, the closing resistance contact is specially designed to extinguish the arc. Since no gas is blown, it has been difficult to make the insulation recovery speed of the closing resistance contact faster than that of the main contact for this reason as well.

The present invention was proposed to eliminate the following two drawbacks, and its purpose is to reduce the size of the equipment, reduce the overvoltage at the time of closing, and reduce the closing resistance at the time of opening or closing. An object of the present invention is to provide a highly reliable puffer-type gas circuit breaker that enables an improvement in the insulation recovery speed of contacts.

[Structure of the Invention (Means for Solving the Problem) The puffer type gas circuit breaker of the present invention includes a closing resistance contact provided on the side of the main contact, and a first movable electrode for the closing resistance contact using a link mechanism. It is configured to operate integrally with the first movable electrode for the main contact, and the second movable electrode for the making resistance contact is attached via an insulator to a support member provided on the side of the second movable electrode for the main contact. , the opening/closing operation of the closing resistance contact is performed prior to the opening/closing operation of the main contact, and a closing resistor is arranged on the back side of at least one of the two electrodes for the closing resistance contact. This is a characteristic feature.

(Function) According to the puffer type gas circuit breaker of the present invention, the opening/closing speed of the closing resistance contact can be easily adjusted to the relative opening/closing speed of the main contact by changing the link ratio of the link mechanism. . Further, by appropriately setting the link ratio, the insulation recovery speed of the closing resistance contact portion can be made faster than the insulation recovery speed of the main contact portion. Furthermore, by arranging the making resistance contact electrode on the side of the main contact electrode and arranging the making resistor on the back side of the making resistance contact electrode, an extremely compact configuration can be achieved.

(Example) Hereinafter, an example of the present invention will be specifically described based on FIGS. 1 to 3. Incidentally, the same members as those of the conventional type shown in FIGS. 6 and 7 are given the same reference numerals, and explanations thereof will be omitted.

In this embodiment, as shown in FIGS. 1 and 2,
A first movable electrode 21 for the closing resistance contact is connected to a support member 23 attached to the insulating tube 7 via a link mechanism 22 . Further, the link mechanism 22 includes a support member 23
The link support part 22a fixed to the pin connection part 22b
A first connecting rod 22 that is connected to the operating rod 5 that drives the first movable electrode 1 for the main contact via the link supporting portion 22a, and that moves in an arc in conjunction with the operating rod 5, using the link support portion 22a as a fulcrum.
c, and a second connecting rod 22d pin-coupled to the first connecting rod 22c.

On the other hand, the second movable electrode 24 for the making resistance contact is a support member 2 that supports the current-carrying conductor 14 of the second movable electrode 10 for the main contact.
5 through an insulator 26, and is slidably supported within a case 27.

Note that this case 27 has a locking portion 27a at its tip.
is provided, and the second movable electrode 24 for the closing resistance contact is biased toward the first movable electrode (to the right in the figure) by a spring 28 and housed. Furthermore, a closing resistor 29 is disposed in the insulator 26 disposed on the back side of the second movable electrode 24 for the closing resistance contact, and is electrically connected to the second movable electrode 24 for the closing resistance contact. It is connected to the.

In addition, FIG. 1 shows the closed state of the circuit breaker, FIG. 2 shows the closed state, and FIG. 3 shows a view taken along the line A--A in FIG. Further, in FIGS. 1 and 2, members provided for opening and closing the main contacts (for example, the link mechanism 16, the insulating rod 15, etc. in FIG. 6) are omitted.

In the puffer type gas circuit breaker of this embodiment having such a configuration, the main contact electrode and the closing resistance contact electrode are opened and closed as described below.

That is, the transition from the closed state to the closed state shown in FIG.
As the operating rod 5 moves to perform the opening operation, the first connecting rod 22c of the link mechanism 22, which is connected to the operating rod 5 by the pin connecting portion 22b, rotates toward the blocking side. At this time, the link ratio of the connecting rods 22c and 22d constituting the link mechanism 22 is such that the closing resistance contact electrodes 21 and 24 operate prior to the breaking operation or closing operation of the main contact electrodes 1 and 10. Since it is set up so that you can
The first movable electrode 21 for the making resistance contact and the second movable electrode 21 for the making resistance contact.
The movable electrode 24 is opened, and then the first movable electrode 1 for main contact and the second movable electrode 10 for main contact in the arc extinguishing chamber are separated. On the other hand, at the time of closing, first, the first
Movable power supply 1': "ji21 and the second movable electrode 24 for the making resistance contact are turned on, and accordingly the making resistor 29 is inserted into the circuit for a certain period of time, and then the first movable electrode for the main contact in the arc extinguishing chamber is turned on. When the electrode 1 and the second movable electrode 10 for main contact are turned on, current no longer flows through the closing resistor 29.

As described above, according to this embodiment, the electrode for the making resistance contact can operate prior to the breaking operation or the making operation of the main contact voltage, and the insulation recovery speed of the making resistance contact portion is improved. can be made faster than the insulation recovery speed of the main contact portion. Furthermore, by arranging the making resistance contact electrode on the side of the main contact electrode and arranging the making resistor on the back side of the second movable making resistance contact electrode, an extremely compact configuration can be achieved.

Note that the present invention is not limited to the embodiments described above, and the making resistor may be arranged on the back side of the first movable electrode 21 for the making resistance contact, and the As shown in FIG.
It may be arranged on the back side of 1. In this case, link mechanism 2
The second connecting rod 22d that constitutes 2 is made of an insulator,
In addition, the sliding current-carrying portion 3 is attached to the support member 23 via an insulator 31.
2 is disposed, and the operating rod of the first movable electrode 21 for the closing resistance contact is configured to slide within this sliding energizing portion 32. Further, the closing resistor 30 is housed within the insulator 31. In this case as well, the same effects as in the above embodiment can be obtained, and since the closing resistor is arranged in two parts, the space of the puffer type gas circuit breaker can be used effectively.

[Effects of the Invention] As described above, according to the present invention, the closing resistance contact is provided on the side of the main contact, and the first movable electrode for the closing resistance contact is connected to the first movable electrode for the main contact using a link mechanism. It is configured to operate integrally with the movable electrode, and the second movable electrode for the closing resistance contact is configured to operate integrally with the movable electrode.
It is attached to the support part H provided on the side of the second movable electrode for the main contact via an insulator, and configured so that the opening/closing operation of the closing resistor contact is performed prior to the opening/closing operation of the main contact, and the two closing resistors By arranging a closing resistor on the back side of at least one of the contact electrodes, it is possible to miniaturize the device, reduce the closing overvoltage during closing, and reduce the closing resistance of the contact when opening or closing. It is possible to provide a highly reliable puffer-type gas circuit breaker that can improve the insulation recovery speed.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing an embodiment of the puffer type gas circuit breaker of the present invention. FIG. 1 shows the circuit breaker in the closed state, FIG. 2 shows the circuit breaker in the closed state, and FIG. 3 shows the circuit breaker in the closed state. A-A arrow view in FIG. 1, FIG. 4, and FIG. 5 are cross-sectional views showing other embodiments of the present invention, in which FIG. 4 shows the circuit breaker in the closing state and FIG. 6 and 7 are cross-sectional views showing an example of a conventionally used double-motion type puffer type gas circuit breaker.
The figure shows the cut-off state, and FIG. 8 is a diagram showing the insulation recovery characteristics of the main contact and the closing resistance contact. DESCRIPTION OF SYMBOLS 1... First movable electrode for main contact, 2... Puffer cylinder, 3... Insulating nozzle, 4... Movable current-carrying contact, 5
... Operating rod, 6... Insulating rod, 7... Insulating tube, 8... Puffer piston, 9... Puffer chamber,
DESCRIPTION OF SYMBOLS 10... Second movable electrode for main contact, 11... Current-carrying cylinder, 12... Second movable current-carrying contact, 13... Second movable shield, 14... Current-carrying conductor, 15...・Insulating rod, 16...Link mechanism, 16a...Link, 16
b, 16c... connecting rod, 16d... link support part,
16e...Fully point, 21...First movable electrode for making resistance contact, 22...Link mechanism, 22a...Link support part, 22b...Pin coupling part, 22c...First connection Rod, 22d... second connecting rod, 23... support member,
24... Second movable electrode for making resistance contact, 25... Support member, 26... Insulator, 27... Case, 27a
... Locking part, 28 ... Spring, 29 ... Closing resistor, 30 ... Closing resistor, 31 ... Insulator, 32 ...
・Sliding current-carrying part.

Claims (1)

[Scope of Claims] A double-motion puffer in which a main contact consisting of a first movable electrode and a second movable electrode for the main contact which can be freely connected and separated is housed in a container filled with arc-extinguishing gas. type gas circuit breaker, a closing resistance contact is provided on a side of the main contact, a first movable electrode for the closing resistance contact is connected to a support member fixed to the container via a link mechanism, and The link mechanism is connected to an operating rod that drives the first movable electrode for the main contact and is configured to operate in conjunction with the operating rod, while the second movable electrode for the making resistance contact is connected to the second movable electrode for the main contact. The first movable electrode for the making resistance contact is attached to a support member provided on the movable electrode side via an insulator, and is configured such that the opening/closing operation of the making resistance contact is performed prior to the opening/closing operation of the main contact. Alternatively, a closing resistor is disposed on the back side of at least one of the second movable electrodes for the closing resistor contact, and this closing resistor is electrically connected to the electrode for the closing resistor contact on the side on which it is disposed. A puffer type gas circuit breaker characterized by: