JPH0436018Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas shield and disconnector that facilitates inspection of the shield and disconnection parts.

In recent years, high-voltage and large-capacity disconnectors have been developed to cope with ultra-high voltage or ultra-high voltage power transmission and increases in system capacity. In such a system, not only is a high-speed interruption required from the viewpoint of transient stability of the system, but since it is an important trunk line, the power outage time must be shortened as much as possible. The time required for inspections of parts, etc. must be minimized as much as possible.

On the other hand, it has become common for gas disconnectors to be used in so-called gas-insulated substations (GIS), which are gas-insulated and connected to equipment such as disconnectors and busbars.
The advantage of GIS is that its footprint is small,
This can help cope with the soaring price of land, but with the rise in voltage and capacity, the diameter of the sealed container (tank) of the breaker is becoming larger, and GIS is also becoming larger. Therefore, it is necessary to reduce the interphase dimensions of the shear breaker as much as possible. However, a space for inspection is required, and the ease of inspection and reduction in interphase dimensions are contradictory issues.

Figure 1 shows a cross-sectional view of a shingle cutter used in conventional GIS. In the figure, reference numeral 1 denotes an arc extinguishing chamber, in which a fixed contact 1a and a movable contact 1b are arranged, and arc extinguishing gas is compressed in conjunction with the cutting action of the movable contact 1b, and the high pressure obtained thereby is Gas is connected to both contacts 1a,
This is a puffer-type arc extinguishing chamber that blows against and extinguishes the arc generated by the separation between 1b and 1b. The movable contact 1b of the arc extinguishing chamber 1 is driven by an operating mechanism (not shown) via a link mechanism 2 and an insulated operating rod 3. There is a capacitor 4 connected in parallel to both contacts 1a and 1b, which divides the voltage applied to the left and right arcing chambers 1. Closing resistor 5 suppresses the surge that occurs when closing the shield or disconnector.

When energized, the current reversibly flows to the bus bar 6, the arc extinguishing chamber 1 on the left side of the figure, the conductor 7, the arc extinguishing chamber 1 on the right side of the figure, and the bus bar 8.

The contacts, nozzles, etc. of the arc extinguishing chamber 1 are inspected through a manhole 10 provided at the end of the tank 9.

Inspection of the contacts, nozzles, etc. of the arc extinguishing chamber 1 on the right side of the figure is done through the inspection port 11 provided in the radial direction of the tank 9.
Check from

FIG. 2 shows a cross-sectional view taken in the radial direction at the position of the arc extinguishing chamber 1 on the right side of FIG. The circuit breaker is shown for only two phases.

A capacitor 4 is installed around the arc extinguishing chamber 1 except for a part.
is arranged, and a closing resistance contact 12 is provided at a part of the position.
are arranged. Reference numeral 13 denotes an operating mechanism that moves the contactor of the arc extinguishing chamber. The reason for arranging the capacitors 4 in an annular manner in this manner is to improve the electric field distribution in the arc extinguishing chamber 1 portion and improve the current interrupting performance against the transient recovery voltage at the time of interrupting. In this case, although the capacitor 4 has a missing part on its circumference, disturbance of the electric field is prevented by arranging the resistance contact 12 in that part.

In such a structure, in order to inspect the contacts, nozzles, etc. of the arc extinguishing chamber 1, it was necessary to remove a part of the capacitor 4 from the inspection port 11, which required a lot of inspection work and a lot of time.

In addition, since the inspection port 11 is located right next to the tank 9, the dimension L ₁ between the tanks 9 is required as an inspection space, which increases the dimension between the tanks and increases the dimension.
When L ₁ was made small, inspection work became extremely difficult.

The conventional structure has drawbacks such as difficult and time-consuming inspection work, large interphase dimensions, large installation area, and uneconomical performance.

The present invention has been devised in view of the above-mentioned drawbacks, and provides a gas inlet and disconnector that can be easily inspected and requires less space for installation.

FIG. 3 shows a radial cross section of the arc breaker according to the present invention at the position of the arc extinguishing chamber.

A capacitor 4 is installed around the arc extinguishing chamber 1 except for a part.
is provided, and a closing resistance contact 12 is provided in a portion where the capacitor 4 is not provided. The closing resistance contact 12 is located on the opposite side of the operating mechanism 13 and diagonally downward at approximately 45 degrees from the horizontal line. The inspection port 11 provided in the tank 9 is also diagonally downward.

The inspection is performed by inspecting the contacts 1a, 1b nozzles, etc. inside the arc extinguishing chamber 1 from between the closing resistance contacts 12. Since the inspection port 11 of the tank 9 is located diagonally downward, inspection can be performed using the space _L2 at the bottom of the tank.
At this time, the operating mechanism 13 is designed to be thin so that it does not protrude much toward the inspection port 11.

With the above arrangement, the resistance contact 12 can be inspected extremely easily while maintaining the electric field distribution improvement effect of the capacitor 4 and the resistance contact 12 described above. Furthermore, inspection port 11
Since the three phases are provided in the same diagonal direction of approximately 45 degrees, both the interphase distance and height of the tank 9 can be reduced.

In order to make such an arrangement possible, a link mechanism that allows the position of the closing resistance contact to be freely selected and a technique that makes the operating mechanism thinner can be used.

As described above, according to the present invention, a capacitor is placed around a part of the arc extinguishing chamber, a closing resistance contact is placed in the exposed part, and a closing resistance contact is placed at the position of the closing resistance contact. By forming a corresponding inspection port diagonally below the tank and arranging multiple inspection ports in the same direction, inspection work becomes easier, inspection time can be shortened, and the interphase dimensions of the breaker are smaller. This makes it more compact, requires less installation space, and is economical in terms of land costs. Furthermore, by reducing the overall width of the three phases of the breaker, in some cases it becomes possible to transport the three phases all at once on a trailer, etc., which reduces transportation and installation costs. play.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional breaker, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a breaker according to the present invention. FIG. The same reference numerals in the figures indicate the same or corresponding parts. In the figure, 1 is an arc extinguishing chamber, 1a is a fixed contact, 1b is a movable contact, 4 is a capacitor, 5 is a closing resistor, 9
is a tank, 10 and 11 are inspection ports, and 12 is a resistance contact.

Claims (1)

[Scope of utility model registration request] A cylindrical sealed container filled with insulating gas and arranged horizontally is equipped with a pair of contacts that operate in the longitudinal direction of the container to cut off the current, and a device that extinguishes the electric arc generated between the two contacts. an arc extinguishing chamber, a capacitor connected in parallel between the two contacts, and a capacitor that operates substantially parallel to the operating direction of the two contacts, and when both the contacts are turned on, before the two contacts are closed. A closed resistance contact and a closing resistance connected in series between the two contacts via the resistance contact are housed, and the sealed containers for three phases are arranged in parallel on the same horizontal plane, An arc extinguishing chamber surrounding both of the contacts is disposed approximately at the center of a projected cross section of a plane perpendicular to the longitudinal direction of the container, and an arc extinguishing chamber that surrounds both of the contacts is arranged in a common direction for the three phases and passes approximately through the center of the projected cross section. The resistive contact is arranged on a radial line approximately 45 degrees below the horizontal line, at a predetermined distance from the arc extinguishing chamber, and surrounds the arc extinguishing chamber at a predetermined distance from the arc extinguishing chamber. The capacitor is arranged on a circumference passing through the center of the resistance contact except for the part where the resistance contact is arranged, and the inspection port is arranged in a part on the extension line in the radial direction of the container. A gas shutoff device.