JPS5813566Y2 - Shiya disconnector - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a breaker, particularly a compressed gas buffer type breaker.

According to this invention, a contact/disconnection point device that generates an arc is provided,
The device includes a fixed contact, a movable contact cooperating therewith, and a first contact that surrounds the fixed contact and ensures the creation of an electrostatic field with a low potential gradient between the separated contacts in the fully open position of the circuit breaker. a generally cylindrical metal electrostatic shield; and a second generally cylindrical metal electrostatic shield surrounding the fixed contact line terminal connection device.

This invention advantageously provides a compressed gas type circuit breaker with a shielding device in which the shielding assembly is assembled on a workbench and then installed.

The circuit breaker of this invention additionally utilizes spherical bearings to facilitate free movement of the operating rod and to compensate for manufacturing inaccuracies that may occur thereby.

Further features of this invention include a novel electrostatic shielding effect obtained by a steel rod for correct guidance of the movable operating buffer cylinder and a metal substrate in the lower and central parts, and a hollow an electrostatic tube section provided on both the lower end of the upright insulating support tube, and a mounting device that facilitates the attachment of a capacitor tube equally dividing voltage to both of the two breaker units forming the module; A superior and easily removable shielding device is used at the upper end of each fixed contact structure.

Additionally, a very important feature of this invention is the use of lateral, roughly semicircular, upright insulated support tubes supporting the upper stationary contacts and the shielding structure with a central support plate structure located below. , thereby allowing the upper stationary contact structure to be electrically connected to the inner ends of the terminal bushing such that no stress is created between said inner ends, or
The module unit is adapted to be compatible with gas feeder transmission line installations.

As mentioned above, the purpose of this device is to support the upper stationary contact structure with the central support plate by means of a semicircular upright insulating support tube to avoid stress between the inner ends of the terminal bushing, and A fixed piston that also performs a shielding action and is supported upright by the support plate, a cylinder for compressing gas that slides on the piston that holds a movable contact, and a horizontal bridging frame that connects these cylinders. ,
The bridge frame is provided with a vertically movable operating rod that is pivotally connected by a spherical bearing, and the spherical bearing compensates for insufficient precision during the contact opening/closing operation. A shielding structure is provided on the plate and extends downward, cooperating with the movable contacts and electrostatically shielding a vertically movable metal bar guided by the fixed piston; such a configuration allows the module to be The purpose of the present invention is to facilitate the assembly of a type of buffer-type breaker unit and to improve its electrical and mechanical performance.

1 to 3 1 shows a circuit breaker assembly 1 consisting of a pair of cooperating gas shutoff units (modules) 2, these two units 2 being connected to an upright main insulating operating rod 6. They are electrically and mechanically connected by a horizontally extending bridging frame 4 which is pivotally connected to a shaft pin 5 of the.

The operating rod 6 is pivotally connected at a point 7 to a bell crank-shaped lever 8 attached to a rotatable main operating shaft 9.

A lever box 10 is attached to the lower surface 11 of a metal support plate 12, for example, by a weld 3 (FIG. 3).

Each of the two breaker units 2 has an upper fixed contact structure 13.

In these structures 13 there is a group of annularly arranged main fixed contact fingers 14 .

These contact fingers make good contact with the annular movable main contact 15 mounted on the operating cylinder 17 when the breaker is in the closed circuit condition, as shown in FIG.

The operating cylinder 17 descends around the fixed piston 18 during the opening operation of the circuit breaker.

A fixed arc contact tube 2 is placed in the center of the main fixed contact finger 14.
0, which contacts a plurality of auxiliary movable arc contact fingers 22 and a movable arc contact rod 23 extending therein.

As part of the operating cylinder 17 there is an insulating hollow orifice 25 .

The orifice 25 directs in a desired direction the gas flow forced out of the compression chamber 30 (FIG. 5) formed between the fixed piston 18 and the movable operating cylinder 17 placed outside.

This gas flow hits the arc 35 formed as shown in FIG. 3 and performs a rapid arc extinguishing action.

The two gas cutoff units 2 work simultaneously by their downward cooperative action and the two are electrically in series, e.g.
The electrical part of the breaker device is formed with a breaker capacity of 0.00 amperes.

The full load continuous current rating of this breaker is, for example, 20
It will probably be from 00 to 4000 amperes.

As shown in FIG. 3, the two breaker units 2 are
The assembly is supported on an upright insulating support tube 40, and this support tube 40 is fixed to the relatively strong metal support plate 12 mentioned above.

Following the assembly of the breaker assembly 1 shown in FIG. 3, the grounded metal tank 41 of FIG. 1 is lifted and placed over the breaker assembly 1.

The support plate 1 is attached to the lower surface of the sturdy mounting ring 46 that is attached to the inner wall surface 48 of the tank 41 by, for example, welding.
2 is secured by bolts 45 (FIG. 1) provided along its periphery.

Flexible conductor 6 connected to upper fixed contact structure 13
0 and 61 are connected to the lower ends 66 and 67 of the conductors of the two terminals-bushings 58 and 59 using a service manhole (opening) 70 provided in the side wall of the tank 41.
Can be installed by hand.

In this way, the main part of the assembly work can be carried out outside the tank 41, with sufficient work space.

As mentioned above, following the assembly of the breaker assembly 1, the tank 41 is placed over it and the two breaker units 2 are installed together.

It will be seen that attached to the side of the tank 41 is a mechanical housing 75 in which a pneumatic mechanism 77 is housed (FIG. 1).

This is of the type that opens the circuit breaker 53 as a whole.

Therefore, through a suitable valve arrangement 80, high pressure gas is applied to the piston 81, which lowers the piston rod 82 and
The bellcrank 83 with arm 84 then rotates clockwise, and this arm 84 also rotates the second bellcrank 87 clockwise via an operating link 86 pivoted at point 85 .

A connecting rod 92 provided with a spring seat 93 is pivotally connected to a point 91 of the second arm 89 of the second bellcrank 87, which connecting rod 92 closes the breaker 53 as seen in FIG. The spring force is applied in the direction, ie to the right.

To the bell crank assembly 75 that operates the main ftMIt+9,
The connecting rod 92 described above is pivotally connected.

That is, the compression spring 100 is configured to close the breaker 53, and a buffer 101 is provided that defines the limit of the closing movement of the breaker 53.

During the opening operation of the circuit breaker, the valve mechanism 81 is activated,
The movable main contact 15 is moved downward in the position shown in FIG. 3 by the piston 81 and the link mechanism described above.

In some applications, where terminal bushings 58-59 are not used, the configuration shown in FIG. 31 may be used.

That is, terminal straps 110, 111 attached to flexible conductors 60, 61 are secured to conductors 115 forming part of a gas-insulated power transmission system 116.

FIG. 31 shows a portion of such a gas-insulated power transmission system 116.

In FIG. 4, the electrical and mechanical interconnection between the two isolation units 2 described above is further clarified.

A bridge rod 4 for shielding is provided on the upper side of the U-shape as a whole, and a shield structure 27 placed on the lower side of the U-shape in the same way.

This bridging rod 4 is provided with a pair of support holes 28 on both sides, in which a horizontal shaft pin 5 is housed.

In this case, a spherical bearing 31 shown in FIGS. 1γ to 19 is used.

By utilizing such a spherical bearing 31, manufacturing inaccuracies in some parts of the circuit breaker are compensated for.

As shown in FIG. 4, a rod 33, made of steel, for example, is used as a guide for the movement of the operating cylinder 17.

The rod 33 slides up and down through guides 34 and 36 provided inside the piston 18, and its movement as the operating cylinder 17 reciprocates between the open and closed positions of the breaker 53. It acts as a guide.

As shown in FIG. 3, a stationary piston 18 is mounted on a central mounting plate 32. As shown in FIG.

A cylindrical shield member 73, 74, 76, 78 for electrostatic shielding is also attached to this mounting plate 32.

These shielding members eliminate dangerous electric field areas.

The mounting plate 32 further includes an upper terminal portion 66 of the breaker 53.
and 67, shield members 96 and 97, and a semicircular support insulator 79 that supports the arc contact 20.

A horizontal section of support insulators 79 upright on either side of these semicircles is shown in FIG.

The main current through this circuit breaker 53 passes from some contact fingers 14 on the upper fixed contact structure 13, made of, for example, "rcupaloy," to the movable main contact 15 of the actuating cylinder 17.

An auxiliary arc contacting finger 22 provided inside the operating cylinder 17 contacts the arc 3 during the breaking operation.
Process 5.

Two shield members 96 and 97 are provided on the upper fixed contact structure 13.

The lower shield member 97 acts as a voltage shield,
Much of the hot, ionized gas generated during the shutoff operation is directed into the region 88 of considerably lower potential gradient, mixing the hot gas with a larger amount of gas.

In addition, the upper shield member 96 has a flexible conductor 60.6 connected to a bushing 58.59 for leading into the circuit breaker.
1 and the terminal bolt 94.

The shield member 96 has a specially shaped spring member 98 (ninth
(Fig. 10) K is thus held in place and held in such a way that it can be easily and quickly removed to gain access to the flexible conductor 60, 61 and the bolt 94.

A parallel capacitor 37 is provided in the circuit breaker assembly 1 to assist in current interruption.

The upper fixed contact structure 13 and the shield members 96 and 97 are of a type independent from the terminal bushings 5B and 59.

Therefore, this breaker 53 may be installed independently, or may be incorporated into a gas-insulated power transmission system as shown in FIG.

The advantageous circuit breaker 53 of this invention can be operated in particular on 242 kv transmission lines and furthermore, for example
A current of 00 to 4000 ampere class can be passed continuously.

The breaking capacity can be, for example, 50,000 ampere class.

Regarding the installation of the condenser tube 37, a bolt 38 which is fitted into a hole 39 (FIG. 11) provided in the central support plate 32 cast from metal and a spring member 43 are provided at the lower end of the condenser tube 37 ( Fig. 21), condenser tube 37
A good electrical contact is made between the support and the support plate 32.

The upper end of the condenser tube 37 is attached to the side surface of the lower shield member 97, as shown in FIG.

The upper shield member 96 includes three equally spaced spring members 9 having the shape shown in FIGS. 9 and 10.
8, it can be easily attached and detached.

If it is desired to use circuit breaker assembly 1 as a circuit breaker of the type shown in FIG. 1, terminal bushing 58.
59, without any tensile, kink or compressive stress occurring at the lower end of the
The connection is made with only the flexible conductor 60 or 61.

Support for the fixed contact structure 13 is therefore obtained only by the upright semicircular support member 79.

The central common support plate 32 is, for example, a cast aluminum member, which has high mechanical strength, supports the piston pressure load during operation of the circuit breaker, and is electrically capable of guiding imperfect shapes. It is of a shape suitable to serve as an electrical shield for the rod 33 and the main insulating pipe attachment bolt.

From a general point of view, the smoother, more continuous, or the sharper the shape, the better it can withstand or be placed near high potential gradients.

The oblong protrusion 32A provided on the support plate 32 acts as a main shield against the above-mentioned imperfections.

The lateral upright support members 79 are very important since they must have the necessary strength to support the fixed contact structure 13 provided thereon.

Furthermore, these support members 79 also have the additional function of keeping the arc and hot arc products away from the side wall 48 of the grounded metal tank 41.

But the most important thing is the terminal bushing 58.59
is used, the stationary contact structure 13 is provided with a transverse insulating support member 79 of semi-circular cross section so that the upper terminal member is completely supported independently of the terminal bushing (without hanging from the terminal bushing). It is to support.

As a result, when the terminal bushings 58, 59 are used, the fixed contact structure 1 can be electrically connected to the lower end of the terminal portion 66, 67, the bent inner end via the flexible conductor 60, 61.
3 is connected.

If terminal bushings are not used, the electrical connection can be made to a "previous" gas insulated power transmission, tubing or live conductor 115 located inside the equipment 116, as shown in FIG. .

By using the lateral support members 79, there is no need to provide bridging rods (not shown) to support two fixed contact structures 13 side by side.

This has the advantage that there is no risk of creeping discharge, and the sulfur hexafluoride (
The advantage of the high insulating properties of SF6) gas 16 is obtained.

By having the above-described configuration, the lower substrate 12
The breaker assembly 1, which can be cut away and fully supported, can be assembled as a unit assembly at the manufacturing site and actually assembled into the tank 41 after being thoroughly tested and adjusted. You can also get this advantage.

The insulating support member 79 having a semicircular cross section is made of, for example, glass-wrapped epoxy material, and has a
The mounting bolt is broken.

The gas stream is directed to a portion of tank 41 where relatively cool non-ionized gas is present.

The upper metal shield member 96 is the main shield member, and wraps around the main terminal bolt 94 and the flexible conductor of the fixed contact structure 13, and has a sharp corner of the metal member that needs to be isolated from the electric field. It softens the potential gradient during switching.

The shield member 96 can be easily assembled and disassembled by using, for example, three equally spaced elastic mounting brackets 98 to removably hold the shield member 96 in a predetermined position. can be obtained with this idea.

For example, three equally spaced resilient fittings 98, which are curved pieces of spring steel and resiliently hold the shield member 96, were used.

When the shield member 96 is picked up during assembly and placed on these metal fittings 98, these metal fittings 98 will deform somewhat and you will hear a "click" sound, then the shield member 9 will be removed.
6 is pushed into position where it is mechanically captured by these three fittings 98.

It is preferable that these metal fittings 98 are placed at equal intervals on one circle, and when the shield member 96 is placed on top of the metal fittings 98 and pressed, the uneven surface of the end of the metal fittings 98 will click. When the time came, I couldn't lift it with 11.

No special tools are required to remove the shield member 96.

Simply insert your toga finger under one of the metal fittings 98 and push it diagonally upward, and the shield member 96 will tilt upward.

The shield member 96 can then be removed using only two hands and without the need for tools.

Condenser tube 3γ is somewhat unique in its mounting method.

That is, fittings 62 and 63 are installed at both ends of the condenser tube 37.
is provided.

The use of these fittings is necessary because the condenser tube 37 does not have sufficient mechanical strength to attach itself directly to anything else.

The lower end fitting 63 is provided with a single straight pin-like stud 38 extending downwardly from the condenser tube 37.

There is also a drilled hole 39 in the central, solid mounting plate 32.

The bolt 38 at the lower end of this condenser tube 37 is inserted into this hole 39.
It's easy to push it down, so no screwdriver work is necessary.

A small U-shaped spring fitting 43 is attached to the lower end of the condenser tube 37.
(FIG. 22) is provided and makes electrical contact with the mounting plate 32.

Although this appears to be a small contact, this fitting 43 automatically creates an electrical connection between the mounting plate 32 and the bottom of the capacitor tube 37 when the bolt 38 is dropped into the hole 39.

Next, what is necessary is to shake the upper end of the condenser tube 37 slightly, push the mounting bolt 50 (FIG. 23) into the upper fitting 62 of the condenser tube 37, and attach the lower shield of the fixed contact structure 13. The bolt 50 is screwed into a mounting hole provided in the member 97.

The breaker assembly 1 completed here has buttons 1 and 3.
The circuit breaker 53 is a completely assembled unit made of modular parts forming the circuit breaker 53, and can be adjusted and inspected as assembly work at the manufacturing site, which is very easy to work with.

The breaker unit 2 is assembled into the breaker 53 through the manhole 70 of the tank 41, or after it is assembled to the lower support plate 12 to which each component is attached, the tank 41 is placed over the breaker assembly 1. You can.

With this configuration, several workers can enter the tank 41 at the same time to perform necessary adjustments or inspections, and also promptly replace parts that are likely to be defective while the breaker 53 is in use. You will be able to do it.

Worn parts can be quickly and easily replaced.

These things can be done through the manhole 70.

Similarly, inspection of components can also be performed through the manhole 70.

There is no obstruction to the field of view for this inspection, and maintenance is easy.

As shown in FIG. 31, the modular breaker assembly 1 is applied to the gas-insulated power transmission equipment 116, as shown in FIG.
Also, as previously mentioned, the live conductor 115 may be connected to the fixed contact structure 13 of the circuit breaker via the flexible conductor 60.

The most important aspect of tank 41 is its applicability to gas insulated power transmission equipment 116.

This is due to the compact structure of this tank and
This is due to the flexible inlet flanges 55, 56 (FIG. 2).

A hollow support tube 40 is used to attach it to the central mounting plate 32 and the lower support plate 12.

It is cast in epoxy with an appropriately shaped metal implant.

The use of cast epoxy allows for a very compact overall circuit breaker design since it can withstand relatively high potential gradients.

This allows the use of very short tubes,
The short length of the cylinder means that the mechanical moment (
This means that the load during transportation and during operation is smaller, which means that the diameter of the tube can also be smaller.

Therefore, the height of the tank 41 and the inner diameter 48 of the tank can be made smaller by making the central mounting plate 32 smaller than when other materials are used for the support tube 40.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a tank-type compressed gas breaker in a closed circuit state, which is an embodiment of this invention, and Figure 2 is a somewhat enlarged view of the tank with the terminal bushing of the breaker in Figure 1 removed. FIG. 3 is an enlarged vertical sectional view showing the two modular breaker units attached to the support plate of the cutter 7 and disconnector of FIG. 1 and the operating mechanism connecting them;
FIG. 4 is an enlarged view of the breaker unit shown in FIG. 3 with the contact structure in a fully open state, one side view and the other side a longitudinal sectional view, and FIG. 5 is an enlarged view of the breaker unit shown in FIG. FIG. 6 is a front view of the upper conductive shield bridging frame, FIG. 7 is a top view of the bridging frame of FIG. 6, Figure 8 is a side view of the bridge frame shown in Figures 6 and 7, Figure 9 is a side view of the spring fitting that holds the upper electrostatic shield, and Figure 10 is a side view of the spring fitting shown in Figure 9. A top view, FIG. 11 is a top view of the support plate that supports the two breaker units shown in FIG. 1, and FIG.
FIG. 13 is a cross-sectional view of a part of the support plate taken along the line xn-xn in the figure, and FIG. 14
The figure is an end view of the bridge frame in Figure 13, and Figure 15 is an end view of the bridge frame in Figure 13.
16 is an elevational view of a portion of the spring member shown in FIG. 15, and FIG. 18 is a side view of the spherical bearing used to connect the rod and the bridging frame. FIG. 18 is a longitudinal cross-sectional view of the spherical bearing in the XMII-fast curve of FIG. 17. FIG. Figure 20, which is a horizontal sectional view taken along the line ■-■ with some parts removed, is a partial cross-section to show the spherical bearing for connection to the operating rod of the bridge frame placed on the upper side. FIG. 21 is a front view of the condenser tube, partially taken in longitudinal section to show the mounting device at both ends, and FIG. 22 is a U-shaped spring fitting on the right end surface of the condenser tube in FIG. 21. 23 is a top view showing the mounting bolts of a part of the left side of the condenser tube in FIG. 21, and FIG. 24 is an end view showing one of the upper shield tubes combined with the support plate. 25 is a side view of the end piece of the electrostatic shield tube shown in FIGS. 24 and 27, and FIG. 26 is a side view of the end piece of the electrostatic shield tube shown in FIGS.
FIG. 27 is a partially enlarged sectional view taken along the line xxvi-XXVI of the shield tube in FIG. Figure 28 is Figure 27 (7) XXVIIIXX
VIII Partial cross-sectional view taken in the direction of the arrow toward the line,
29 is an enlarged sectional view showing the elastic support fitting that removably supports the upper cylindrical shield member of the fixed contact on the left side of FIG. 1, and FIG. 30 is an enlarged sectional view of the fixed contact on the left side of FIG. FIG. 31 is a top view of the portion of the provided flexible conductor that is combined with the lower end of the terminal conductor of the terminal bushing.
FIG. 3 shows an electrical connection between the circuit breaker of the invention and a "tube" conductor, which is connected to a "tube" type gas-insulated power transmission system instead of the terminal bushing shown in the figure; Note that the same reference numerals indicate corresponding parts in these drawings. In the drawings, 1... Breaker assembly, 2... Breaking unit, 4... Bridge frame, 5... Shaft pin, 6...
Operating rod, 13... Fixed contact structure, 14... Fixed contact finger, 15... Movable main contact, 17... Operating cylinder, 18... Piston, 30... Compression chamber, 31
... Spherical bearing, 32 ... Mounting plate, 53 ... Breaker (as a whole) 60.61 ... Flexible conductor, 79
...Semi-circular support insulators on the sides.

Claims (1)

[Scope of utility model registration request] A pair of laterally provided modular buffer-type breaker units each comprising a fixed contact device and a movable contact device that comes into contact with and separates from the same, the fixed and movable contact devices being spaced apart in a predetermined vertical direction. A semi-cylindrical insulating holding plate provided on the side of each of the breaker units for fixed support, a metal support plate to which the holding plate is attached below, and each breaker unit supported upright by this support plate. a fixed piston, a movable cylinder included in each of the cutoff units to hold the movable contact device and slide on the fixed piston to compress the gas;
a horizontally extending bridge frame that mechanically connects these movable cylinders, an insulating operating rod that is pivoted to the bridge frame by a spherical bearing and moves in the vertical direction, and cooperates with each of the moving contact devices; and a vertical metal rod guided by the fixed piston, and a downwardly extending shield structure located on the support plate and electrostatically shielding the frame when the pair of contacts are in a fully open position. Tasha disconnector.