JPS617520A - Buffer type gas breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a circuit breaker structure for a puffer type gas circuit breaker, and in particular, a circuit breaker having a main contact on the outer periphery of an insulating nozzle and equipped with a resistor for suppressing closing surges. Then, it is opened to a twin movable gas circuit breaker that is equipped with a dedicated resistance contact and is suitable for increasing the withstand voltage of a high voltage, large capacity gas circuit breaker.

[Background of the invention]

Conventionally (Japanese Unexamined Patent Publication No. 51-85473), a dual movable structure has been proposed in which the stator side of the regular puffer is also linked to the movement of the movable element and opened in opposite directions. The structure plan was not to make the main contactor and the -resistance contact dually movable.

The twin movable type is considered to be a cut-off part suitable for high voltages, but as it is, it is not suitable for breaking large currents, so in order to compensate for this, we combined the technology of the well-known suction puffer (Japanese Patent Publication No. 57-34616). A twin movable gas circuit breaker combined with a suction puffer has been proposed.

[Purpose of the invention]

An object of the present invention is to provide an excellent interrupting section for a gas circuit breaker that is suitable for interrupting high voltages and large currents and has a short arc time.

[Summary of the invention]

The key point of the present invention is to link all of the so-called fixed arc contact of the normal type puffer, the fixed main contact on the outer periphery of the nozzle, and the closing resistance contact for the closing resistance to the movable element side, and to separate the pairs during the breaking operation. The arc contact, main contact, and resistance contact move in opposite directions, and the opening speed between the poles increases.
The reason is that the separation length is increased.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Among the contacts that approach and separate from each other in pairs, 3 and 4 are the first and second arc contacts, respectively, and 6 and 7 are, respectively,
The first and second main contacts, 26 and 27, are the first and second main contacts, respectively.
This is the second closing resistance contact. 1 is a fixed piston, and 2 is a puffer cylinder that slides with the fixed piston 1, and a volume formed by these, that is, a puffer chamber is formed.

First arc contact 3. The first main contact 6 is fixed to the top plate of the puffer cylinder 2, and the first resistance contact 26 is connected via an arm fitting 28 pulled out from a part of the outer circumference of the puffer cylinder 2. Each of the cylinders has a mounting number and is configured to interlock with the puffer cylinder 2.

Reference numeral 5 denotes an insulator nozzle, which surrounds the electrically connected parts of the first and second arc contacts, and is connected to a puffer cylinder.
It serves as a flow guide that guides gas from the gas vent (not shown) in the top plate between both arc contacts. The base of the nozzle 5 is sandwiched between the first main contact 6 and the top plate of the puffer cylinder 2 and attached to the puffer cylinder 2.

The fixed piston 1 on the puffer cylinder 2 side is.

It is attached to a bracket 9 fixed to an insulating support cylinder 11, and a puffer cylinder shaft 8 is inserted through its center.
is penetrated. 10 is an insulating operating rod for transmitting operating force to the puffer cylinder shaft 8 from an external operating device (not shown).

15 is the other insulating support tube, and 14 is a bracket fixed to it. Reference numeral 13 denotes a guide fitting fixed to the bracket 14, into which a shaft 29 is inserted, a cylindrical member 12 that slides on the outer periphery of the guide fitting 13 is inserted into the shaft 29, and a second member is inserted into the center of the lower plate. A second main contact 7 is fixed to the outer periphery of the arc contact 4.

An insulating or metal arm 23 extends from a part of the outer periphery of the cylindrical member 12, and a second closing resistance contact 27 is attached to the tip of the arm 23 via an insulating material 24. 27
is surrounded by an electric contact ring 25 configured to slide on the electric contact part on its outer periphery, and as shown in Fig. 1 showing the closed state, the first closing resistance contact 26 and They are configured to make opposing contact.

22 is a resistor for suppressing a surge. One part of it is
It is electrically connected to the second resistance contact 27 via the electrical contact ring 25, and the other end is fixed to the bracket 14 via the support metal fitting h1.

18 is linked to the movement of the puffer cylinder 2 side, and the second arc contact 4. Second main contact 7. This is an insulated operating rod for moving the second closing resistance contact 27 and the like.

One end thereof has a fulcrum on a protrusion 16 provided on the bracket 9, and is attached to a link 17 having a driving point at the connection between the shaft 8 of the puffer cylinder 2 and the insulated operating rod 10, and the other end is attached to the bracket 14. A link 1 having a fulcrum at a protrusion 20 provided on the shaft and a point of action at one end of a shaft 29.
Attached to 9.

Further, a wipe delay operation mechanism (not shown) is incorporated into either the closing resistance contact 26 or 27. This is a mechanism for automatically controlling the contact priority order of the closing operation special number contact and the opening priority order of each contact during the cut-off operation.

When the circuit breaker is moved in the closing direction from a fully open state, the resistance contact, the arc contact, and the main contact contact in this order, with the resistance contact having the highest priority.

During breaking operation, the resistance contact, main contact, and arc contact are opened in this order, and a wipe delay action mechanism is installed on the resistance contact side for the purpose of finally igniting the interruption arc from the arc contact. is provided.

The interrupting operation of the dual movable interrupter configured as described above will be explained with reference to FIG.

An external operating device (not shown) is activated by the command to shut off! !
#Pull down the operating rod lO to the lower side of the diagram, and from the closed state shown in Figure 1, remove the puffer cylinder 2 and the members attached to it.
That is, the entire movable part on the puffer side is lowered, and while compressing the arc-extinguishing gas in the puffer chamber formed by the piston 1 and the puffer cylinder 2, the compressed gas is sent through the insulating nozzle 5 to the first and second The arc is led between the contacts. On the other hand, due to this operation, the link 17 is driven counterclockwise, so the insulated operating rod 18 also descends, and the link 19 moves clockwise, thereby causing the shaft 29 to move upward in the figure, that is, toward the puffer cylinder. -2 is driven in the opposite direction. Therefore.

A pair of arc contacts 3, 4, respectively. Main contact 6.7
．． The relative speed of opening and opening of the closing resistance contacts 26 and 27 is doubled, and the distance between the poles is widened due to the high-speed operation.

As mentioned above, the opening of each contact is determined by the closing resistance contact 26.
, 27. Next, the main contacts 6, 7. Finally, arc contactor 3
, 4, are performed accurately within a short time. A breaking arc occurs between the arc contacts 3 and 4 that open last,
Arc-extinguishing gas from the puffer chamber is strongly blown onto the arc through the nozzle 5 to cut it off.

In the charging operation, the puffer cylinder is
2 upwards and link 17. Operation dedication 18, link 1
9, by lowering the shaft 29 in the opposite direction to the puffer cylinder 2, the closing resistance contact 26 is
, 27. Arc contacts 3, 4. The main contacts 6 and 7 make contact in this order.

In the twin movable puffer cutoff section configured in this way,
Not only the arc contacts 3, 4, but also the external main contacts 6, 7 of the nozzle 5. Since all of the contacts in each pair, the resistance contacts 26 and 27, are each driven by a twin movable mechanism, the opening or closing speed can be significantly increased compared to the case of a regular puffer. can. Therefore,
It can be used as a large capacity circuit breaker for ultra-super high voltage.

Note that FIGS. 3 and 4 show the insulating tube 3 into which the resistor 22 is inserted.
0 is provided to serve as a steady rest for the electrical contact ring 25 of the second resistance contactor 26.

〔Effect of the invention〕

According to the present invention, it is possible to provide a single-break circuit breaker even when the circuit breaker is used for ultra-high voltage systems that require suppression of closing surges, and when large values of load current and breaking current are required. cost.

Cost reduction can be achieved by reducing the site area.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the closing state of the shut-off part of the puffer type gas circuit breaker of the present invention, FIG. 2 is a vertical cross-sectional view during the same disconnection operation, and FIG. 3 is a partial cross-sectional view of a further reinforced embodiment. , FIG. 4 is a sectional view taken along the line ■-■ in FIG. 3. 2... Puffer cylinder - 13... First arc contactor, 4... First arc contactor, 6... First main contactor, 7... Second main contactor, 18...・Insulated operation rod, 19
···Link. 26...First resistance contact, second resistance contact.

Claims (1)

[Claims] 1. In a container filled with arc-extinguishing gas at a single pressure, a pair of separable arc contacts, a main contact, a closing resistor contact, a closing resistor, and a fixed piston are provided. A pressure generating section consisting of a puffer cylinder is driven together with the arc contact provided on the side of the puffer cylinder to guide the gas flow obtained in the pressure generating section, and its throat is opened by the other arc contact. the arc contactor on the side containing the puffer cylinder;
The arc contact, the main contact, and the resistance contact on the other side are attached to each of the main contact and the resistance contact from the puffer cylinder side via a link and an insulated operating rod, respectively. A puffer type gas circuit breaker characterized in that the pair of contacts can move in opposite directions when opening and in opposite directions when closing.