JPS59224022A - 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] The present invention relates to a power circuit breaker.

Generally, a power circuit breaker consists of a cutoff section that turns on and off the current, and an operation section that operates the cutoff plan when necessary in response to a command. Furthermore, in typical prior art embodiments, the operating parts are placed at a partial pressure to ground potential. For this reason, the driving energy of the operating part connects the cutoff part to which high voltage is applied and the operating part at ground potential, and it must have mechanical strength to transmit the driving energy as well as voltage resistance and insulation performance. There wasn't. Such structural restrictions have been a major drawback when attempting to speed up the operation of the circuit breaker. For example, when high-speed, large-capacity shutoff is performed, there are drawbacks such as shortening the time required to start moving and requiring a large amount of energy to drive at high speed.

The present invention is intended to improve these shortcomings of conventional circuit breakers, and aims to reduce the mass driven during circuit breaker,
The object of the present invention is to provide a breaker that makes it possible to utilize energy in a form suitable for high-speed driving.

The breaker of the present invention includes a shield provided around the cutoff part of the breaker, a rectifier connected between the shield and the cutoff part, a capacitor charged by the DC voltage of the rectifier, and a photoactivated thyristor in combination with the capacitor. It has a repulsion coil connected via a repulsion coil and a repulsion plate paired with the repulsion coil.

The repulsion coil generates the repulsion driving force by discharge of the capacitor carried out by the photoactivated thyristor.

The repulsion plate interrupts the breaker by the repulsion driving force of the repulsion coil.

Next, the present invention will be explained by examples.

1 and 2 show the configuration of an embodiment of the present invention, FIG. 1 shows the breaker in a closed state, and FIG. 2 shows the breaker in an open state. Note that this embodiment shows the case of a buffer type SF6 gas breaker.

In the figure, (1) is a cutoff portion where the cutoff 9 is energized, and the voltage of the circuit is applied to this portion.

The movable part of this breaker (1) is mechanically fixed to the repulsion plate (2). In the closed position shown in FIG. 1, the repulsion plate (2) is in close proximity to the repulsion coil (3). In addition, a shield (4) is provided to mainly surround the movable part of the breaker part (1), and this is held electrically insulated from the breaker part (1) with an insulator α0. . This movable part is arranged to perform a closing operation by means of a drive rod ol). rectifier(
5) is connected between the breaker (1) and the shield (4), and a capacitor (6) is connected to the DC output terminal of the rectifier (5) via a resistor. The repulsion coil (3) and the coil of the trigger device (9) are connected via a capacitor (6) and a light-activated thyristor (7). These parts are collectively housed in a ground tank a4.

When performing the closing operation, the drive rod 0 is driven leftward from the state shown in FIG. 2 to the closing position by an operating device (not shown). After moving to the closing position in this manner and being held at the closing position by the holding latch (8) engaging the trigger device (9), the drive rod α■ returns to its original position again. In this way, the normal closed circuit state shown in FIG. 1 is achieved. In the closed circuit position shown in Figure 1, the fixed side (6) of the breaker is engaged with the movable side, and a current-carrying path is established from the bushing (15A) to the movable side, to the fixed side, and to another bushing (15B). It is formed. A shield Q1 is also provided on the fixed side (b), which is held in the usual manner.

Next, details of the shutoff operation will be described. When shutting off, the electric charge stored in the capacitor (6) is simultaneously caused to flow through the photo-activated thyristor (7) to the repulsion coil (3) and the trigger device (9), and the repulsion plate (2) is released at the same time as the holding latch (8) is released. ) to the right. 17 mechanically connected to the repulsion plate (2) and the movable parts of the cut-off portion (1) are also driven to the right, and the cut-off is performed in the same way as the cut-off operation of a normal buffer type SF6 gas breaker. This power storage device (6) is configured to store power in a normally energized state. In other words, since the breaker (1) and the shield (4) are insulated, the capacitance of the shield (4) to ground and to the breaker increases depending on the voltage applied to the breaker (1). A divided voltage is generated accordingly. A rectifier (5) is provided between the shield (4), l, and the disconnection section (1), and a condenser (6) is charged by the output DC voltage. In order to activate the optically activated thyristor (7), a light guide (not shown) is guided to the ground potential and an optical signal is sent from the control system.

In this example, the repulsion plate (2) and repulsion coil (3) are simply flat plates, but in order to increase the driving force, a member with high magnetic permeability is provided, and changes in the driving force during the stroke are appropriately controlled. In order to improve the characteristics, it is possible to make various changes to improve the characteristics, such as increasing the length in the axial direction or cutting a portion of the length.

In addition, although this embodiment has been explained using an example of a grounded tank type breaker, even if it is an insulator type breaker, by making the configuration and size of the shield (4) appropriate, it is possible to configure a complete (similar breaker). In the case of an insulator type circuit breaker, in conventional implementations, the operating rod placed between the voltage applying part and the earth potential part is usually larger and heavier than that of a grounded tank type circuit breaker. Therefore, the present invention can exhibit effects equivalent to or better than those of the grounded tank type even in the insulator type.

Further, although this embodiment has shown an example of a buffer type gas breaker, the same effect can be achieved in a dual pressure type breaker by driving the spray valve at the same time as the contact is driven.

As described above, the breaker of the present invention has a smaller mass of the driving part to be driven at the time of breaker than the conventional circuit breaker, and the driving method uses an electromagnetic repulsion method with an extremely fast response, so it is suitable for high-speed operation. This also contributes to increasing the breaking capacity. Furthermore, since the impact at the time of breaking can be reduced, the overall structure does not have to be as strong as the conventional circuit breaker.

[Brief explanation of the drawing]

Figures 1 and 2 are configuration diagrams of one embodiment of the present invention.
The figure is a block diagram of the circuit breaker in the closed state, and FIG. 2 is the block diagram of the circuit breaker in the open state. (1)... Breaking part, (2)... Repulsion plate, (3)...
...Repulsion coil, (4)...Shield, (5)...
Rectifier, (6)... Condenser, (7)... Light activated thyristor, 0])... Drive lot. In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Procedural amendment (voluntary) 2. Name of the invention Breaker 3. Person making the amendment Relationship to the case Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent Address 2-2-3-5 Marunouchi, Chiyoda-ku, Tokyo
, "Detailed Description of the Invention" column of the specification subject to amendment. 6. Contents of the amendment 1) "Buffer type" on page 3, line 10 of the specification is corrected to "buffer type". 2) "Buffer type" on page 5, line 7 of the specification is corrected to ``1 buffer type''. 3) "Buffer type" on page 6, line 16 of the specification is corrected to "buffer type."that's all

Claims (1)

[Claims] A shield is provided around the cut-off part of the breaker, a rectifier is connected between the shield and the cut-off part, and a charger is charged by the DC voltage of the rectifier, and a photoactivation device is used to discharge the charger. A breaker comprising a thyristor, and a repulsion coil and a repulsion plate that generate a repulsion driving force by discharging a charger due to the operation of the photo-activated thyristor, and the breaker is disconnected by the repulsion coil and the repulsion plate. .