JPH042021A - Buffer type gas-blast circuit-breaker with making-resistance - Google Patents

Abstract

PURPOSE:To lessen the diameter of a closed vessel so as to achieve the small size and retrenchment of not only a circuit breaker in itself but also of a compressed gas insulation switchgear using the breaker by decentering the axial center of an arc-extinguishing chamber against the axial center of the closed vessel while decentering also the axial center of each of making- resistance and a making resistance contact toward a side opposing the axial center of the arc-extinguishing chamber. CONSTITUTION:A first leading-out section 2 for connecting a buffer type gas-blast circuit- breaker to another device is provided at the lower part of sidewall of a cylindrical closed vessel 1 in such a manner as being projected at a right angle to the axial direction of the vessel 1, and a second leading-out section 3 is provided at also the upper part of the sidewall in such a manner that the axis of the leading-out section 3 may correspond planarly to that of the leading-out section 2. An arc-extinguishing chamber 4 is received in the vessel 1 in such a longitudinal arranging manner that it may be set at a position decentered from the axial center of the vessel, and then a making resistance contact 5 and making-resistance 6 are respectively provided off the axial center of the vessel 1 in a direction opposing the arc-extinguishing chamber 4 in parallel to the chamber. By making such processes like these, a circle circumscribing the arc-extinguishing chamber 4, the contact 5 and the resistance 6 respectively may be arranged coaxially to the vessel 1 and therefore the diameter of the vessel 1 can be minimized while an insulating distance between the vessel 1 and the gas-blast circuit-breaker is sufficiently secured.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention relates to a buffer type gas cut-off circuit with a one-point cut-off resistance contact, which is used in a large-capacity gas-insulated switchgear such as a 550 kV system. It is related to vessels.

(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. From this perspective, recently, when the current is cut off, the arc-extinguishing gas in the buffer chamber is compressed to create a high-speed gas flow, and buffer-type gas is used to extinguish the arc generated between the main contact electrodes of the arc-extinguishing chamber. Circuit breakers are widely used. Compared to conventional circuit breakers, this buffer type gas circuit breaker has
It has the advantage of excellent arc-extinguishing performance and a simple structure, but in order to further increase its reliability, it is important to reduce the number of parts and simplify the structure. Efforts are being made to reduce the number of points. For example, currently 5
In the 50 kV system, a two-point buffer type gas circuit breaker with a breaking current of 63 kA has been put into practical use, but there is a demand for a one-point break.

Furthermore, in buffer type gas circuit breakers for lines in large-capacity systems such as 550 kV class, a closing resistance method is adopted in order to suppress closing overvoltage when the circuit is turned on. In this system, a closing resistance contact with a closing resistance is installed in parallel with the main contact of the buffer type gas circuit breaker, and when closing, this closing resistance contact is closed before the main contact, and the closing overvoltage is suppressed by the closing resistance. This is to insert the main contact.

Further, when opening in this method, the making resistance contact is first opened, and then the main contact is opened.

(Problem to be Solved by the Invention) By the way, such buffer type gas circuit breakers are used to configure gas-insulated switchgear in electrical stations such as substations and switchyards. In response to the current situation, there is a strong demand for downsizing of gas insulated switchgear, and along with this, there is also a demand for downsizing of buffer type gas circuit breakers themselves.

In this case, generally, depending on the layout of the gas circuit breaker for gas insulated switchgear, it is possible to downsize the gas insulated switchgear as a whole by placing it vertically rather than horizontally. Even in buffer type gas circuit breakers,
The miniaturization of closed containers in vertical configurations, especially their diameter reduction, is being studied.

However, in the above-mentioned closing resistor buffer type gas circuit breaker, the closing resistor and closing resistance contact are provided in parallel with the arc extinguishing chamber, so there is no need to connect between the arc extinguishing chamber and the closing resistor, or between the closing resistor and the sealed container. In order to ensure insulation, the diameter of the sealed container inevitably becomes large. In particular, conventional closing resistor material buffer type gas circuit breakers had an arc extinguishing chamber located in the center of the sealed container. Therefore, compared to a buffer type gas circuit breaker without closing resistance, it was inevitable that the sealed container would have a larger diameter.

The present invention was proposed in order to solve the problems of the prior art as described above, and its purpose is to provide a vertical buffer type gas circuit breaker with a closing resistance contact, which tends to be large for boat fishing. By arranging the arc chamber, closing resistor, and closing resistance contacts optimally without impairing functionality, the buffer type gas circuit breaker itself, and by extension the gas insulated switchgear itself, can be made smaller. It is about providing the equipment.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned objects, the present invention provides an arc extinguishing chamber that is arranged vertically inside a vertically arranged hermetic container. A high voltage conductor connected to the arcing chamber is drawn out from an opening formed on the side surface of the sealed container to an adjacent device, and a closing resistor and a closing resistor are connected inside the sealed container electrically in parallel with the arc extinguishing chamber. In a closing resistor buffer type gas circuit breaker provided with a contact, the axis of the arc extinguishing chamber is eccentric to the axis of the sealed container, and the axis of the closing resistor and the closing resistance contact is eccentric to the axis of the arc extinguishing chamber. It is characterized by being eccentric to the opposite side from the axis.

(Function) In the present invention having the above configuration, the circle circumscribing the arc extinguishing chamber, the closing resistor, and the closing resistor contact can be arranged approximately coaxially with the sealed container, and the arc extinguishing chamber, the closing resistor, and the closing resistor contact can be arranged approximately coaxially with the sealed container, and the The insulation distance between each member can be set to a sufficient and minimum value, and the closed container can be made smaller.

(Example) Hereinafter, an example of a buffer type gas circuit breaker with a closing resistance contact according to the present invention will be described in detail with reference to FIGS. 1 to 4.

FIGS. 1 and 2 show an embodiment in which the present invention is applied to a vertically arranged sealed container having a Z-shaped opening.

In this embodiment, a first opening 2 for connecting the buffer type gas circuit breaker to other equipment projects from the lower side wall of the cylindrical sealed container 1 at right angles to the axial direction of the sealed container 1. On the other hand, a second
The opening part 3 is provided so that its axis is coaxial with the first opening part 2 in a plan view. As shown in the plan view of FIG. 1, an arc extinguishing chamber 4 is housed in the sealed container 1 in a vertical arrangement such that its axis is offset from the axis of the sealed container 1. There is. Further, a closing resistance contact 5 and a closing resistance 6.6 are arranged in parallel with the arc extinguishing chamber 4, but these members are offset from the axis of the sealed container 1 in the opposite direction to the arc extinguishing chamber 4. It is set up with care.

In addition, 7 in the figure is a mechanical part of the circuit breaker provided at the lower part of the sealed container 1, and the contact in the arc extinguishing chamber 4 and the closing resistance contact 5.
It is what drives the. In this embodiment having such a configuration, a circle circumscribing the arc extinguishing chamber 4, the making resistance contact 5, and the making resistors 6, 6 is arranged coaxially with the sealed container 1, and the insulation between each of these members and the sealed container 1 is maintained. The diameter of the closed container 1 can be minimized while ensuring a sufficient distance.

Next, in the embodiment shown in FIGS. 3 and 4, the present invention is applied to a vertically placed sealed container 1 having upper and lower openings in a U-shape. In this embodiment, the upper and lower openings 2 and 3 are formed on the same side of the closed container 1 so as to be coaxial when viewed from a plan view. Further, the arc extinguishing chamber 4 is provided eccentrically toward the openings 2 and 3 in the sealed container 1, and a closing resistance contact 5 and closing resistors 6 and 6 are provided on the opposite side of the openings 2 and 3 to the closed container 1. is placed eccentrically from the axis of the Therefore, in this embodiment as well, the circle circumscribing the arc extinguishing chamber 4, the closing resistance contact 5, and the closing resistance 6.6 is arranged coaxially with the sealed container 1, and a sufficient insulation distance between each of these members and the sealed container 1 is ensured. At the same time, the diameter of the closed container 1 can be minimized.

[Effects of the Invention] As explained above, in the present invention, the axis of the arc extinguishing chamber is eccentric to the axis of the closed container, and the axis of the closing resistor and the closing resistance contact is eccentric to the axis of the arc extinguishing chamber. A buffer with a closing resistor that allows the diameter of the closed container to be made smaller despite the simple method of making the center eccentric to the opposite side of the center, and allows for downsizing not only the circuit breaker itself but also the gas-insulated switchgear that uses it. It becomes possible to provide a type gas circuit breaker.

[Brief explanation of the drawing]

1 and 2 are a plan view and a longitudinal sectional view showing a first embodiment of a buffer type gas circuit breaker with closing resistance according to the present invention, and a third
FIG. 4 is a plan view and a longitudinal sectional view of a second embodiment of the present invention. 1... Airtight container, 2... First opening part, 3...
2nd outlet part, 4... Arc extinguishing chamber, 5... Closing resistance contact, 6... Closing resistance, 7... Mechanism part. Figure 1 73 2nd. Intercession @dan diagram diagram

Claims (1)

[Claims] (1) An arc extinguishing chamber is arranged vertically inside a vertically arranged sealed container, and the high voltage conductor connected to this arc extinguishing chamber is drawn out from an outlet formed on the side of the sealed container to adjacent equipment. , in a puffer-type gas circuit breaker with a closing resistor, comprising a closing resistor and a closing resistance contact electrically connected in parallel with the arc extinguishing chamber inside the sealed container, A puffer-type gas circuit breaker with a closing resistor, characterized in that the axis of the arcing chamber is eccentric, and the axes of the closing resistor and closing resistance contact are eccentric to the side opposite to the axis of the arc-extinguishing chamber.