JPS58155617A - Breaker for wiring adapted for automatic higher rank breaker - Google Patents

Abstract

1. Protective circuit breaker arrangement comprising two circuit groups (1, 2) electrically connected in series, a first circuit group (1), whose tripping device is in direct engagement connection with a switch contact device (3), and which has a holding device (4) for maintaining the out-of-engagement movement up to a predetermined switch-off time, and a second circuit group (2) in the form of a conventional protective circuit breaker, whose tripping device (5) is in engagement connection, by means of a switch latch (8), with switch contacts (9) of an arc-extinguishing device, characterised in that the holding device (4) of the first circuit group (1) comprises essentially : an exciter winding (12), which is arranged around a switching chamber (13), in which at least one movable contact body (14) made of magnetic material forms a movable coil core, which is pressed against a second contact body (15) by a power store (17), and over whose travel section ventilation slots (18) are formed in the wall of the switching chamber (13), whereby the contact bodies (15, 14) and the exciter winding (12) are electrically connected to each other, and the movable contact body (14) has on a carrier body (21) of magnetic material a plunger (19) which limits a space with the contact bodies (14, 15).

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention provides a method in which a tripping device directly engages with a contact device, and the open state of this contact device is maintained by a holding device until a predetermined cutoff point. The first opening/closing device and the tripping device connect with the arc extinguishing device via the opening/closing latch. The present invention relates to a wiring breaker suitable for an upper automatic breaker equipped with a second switching device that engages with an I contact.

[Prior art and problems]

A circuit breaker operating with two switching devices is known from German Patent No. 31 37 717.0.

In the first switching device, a tripping device engages directly with the contact device. The tripping command is held by a holding device until a predetermined cutoff point. The second opening/closing device includes a tripping device that engages the contact with the arc extinguishing device via the opening/closing latch. In this circuit breaker, repeated opening and closing, so-called bombing operations, are avoided.

The upper automatic breaker is disposed between the building entrance heat supply and a branch section provided with a plurality of circuit breakers. If a short circuit occurs downstream of one of the circuit breakers,
The upper automatic breaker must open the contact in order to support the disconnection operation of the circuit breaker. If the short circuit is broken, the upper automatic breaker must return to the closed state by itself. On the other hand, if a short circuit occurs between the upper automatic breaker and the wiring breaker.

The upper automatic breaker must handle the breaker independently without causing the building inlet fuse to respond. In other words, the circuit breaker must precede the superior office breaker, and the superior automatic circuit breaker must precede the upstream building entrance and needs.

In a planned wiring device called a group protection breaker,
This basic requirement is met by the electromagnetic 1-release device directly engaging the contact and the thermal 1-release device engaging this contact via an opening/closing latch and finally opening it. (European Patent Organization Patent Publication No. 1332@ = German Patent Publication Bulletin No. 2854637). When it is necessary to break a short circuit between this wiring device used as an upper automatic breaker and a lower wiring breaker.

A blinking electromagnetic 1 disconnection device opens the contact and disconnects the 1st path.

Even if the short circuit continues, the contact is closed again, so the contact is opened again. In this way, the contact is opened many times while generating an arc, thereby repeating a plurality of short-term interruptions. During each input period in between, the heat movement 4 removal device is heated.

Finally, the contactor is led to the final disconnection. This behavior is called "bumping operation," and this behavior not only applies multiple loads to the contact, but also increases the am
Insufficient selectivity for retractable Lohies.

The line breaker mentioned at the outset operates without such a pumping action. In this circuit breaker, the electromagnetic 1 release device of the second trip device engages with the contact device only through the opening/closing latch.

The first tripping device mainly consists of a twinkling tripping device,
This instantaneous tripping device directly engages the contact device, and its contact is held by a holding device until the point of disconnection.

The retaining device mainly consists of an electromagnetic one-release device and a thermal one-release device, which trip device is connected to another contact device arranged in a parallel branch to the contact device that engages the first trip device. It is engaged via an opening/closing latch. The electrical tripping device and the thermal one disconnecting device of the holding device are arranged right and left in this parallel branch.

[Purpose of the invention]

This invention features a compact and simple holding device.

The purpose is to provide

[Summary of the invention]

This purpose is to provide a circuit breaker of the above type, in which the second switching device is constituted by a conventional distributed circuit breaker, and
A first switching device is connected in series with a second switching device, and a holding device included in the first switching device holds an excitation coil disposed around the new vehicle and a coil plunger movable within the new vehicle. and at least one movable contact made of magnetic material which is formed and pressed towards the fixed contact by a force enricher, and during the travel of this movable contact an exhaust slit is provided in the wall of the new vehicle.

Further, this can be achieved by connecting the contactor and the excitation coil in series. When an arc plasma with a large short-circuit current and sufficient pressure is generated, the movable contact on the magnetic material side, which is a coil plunger, is separated from the fixed contact, and the resistance that limits the current flowing through this breaker is generated. arise. Only when this current limit is insufficient is the second switching device brought into final disconnection.

The first switchgear is disposed below the base of the line breaker forming the second switchgear. The entire circuit breaker can be assembled as parts or housed in a common base. Such a circuit breaker is generally suitable as a selective circuit breaker located above.

A 1IEl switchgear switchgear can be equipped with a gas-emitting substance on its inner wall in a known manner to support the la flow.

The first switchgear of the first opening/closing device is constructed in the form of a simple cylinder.

The simple structure of the movable contact of the first switchgear is as follows.

It is obtained by a support made of a magnetic material and a contact piece made of a welding-resistant material.

The first opening/closing device is the exhaust slit of a new car.

The movable contact may be formed to be inclined so as to produce a low fluid resistance when moving in the opening direction, and a high fluid resistance when moving in the opening direction.

This avoids harmful overpressures and maintains a current-limiting resistance for a long time.

[Embodiments of the invention]

Next, the present invention will be explained in detail with reference to drawings showing an embodiment of a wiring breaker suitable for a host automatic breaker based on the present invention.

In No. 15A, the circuit breaker has two switching devices, namely a first switching device l and a switching device 2 of jlI2. the tripping device acts directly on the contact device 3 of the first switching device;
The negative polarity command is held by a holding device until a predetermined cutoff point.

The second opening/closing device is provided with a tripping device 5 that engages with the opening/closing latch 8 and comprises, for example, an electromagnetic side tilting device 6 and a thermal sword dance device 7. The opening/closing latch acts on the contact device 9.

The second switchgear 2 is constituted by an ordinary circuit breaker. The first switchgear l is connected in series to the second switchgear, and the circuit breaker as a whole has a connecting terminal 10.
and 11.

It is important that the holding device 4 has the special structure described below.

An excitation coil 12 is arranged around the interrupter I[13, and a movable contact 14 moves between a fixed contact 15 and a stopper 16 in this new vehicle. In this embodiment, the force accumulator 17, which is a helical spring, connects the movable contact 14 to the fixed contact i.
As shown in FIG. 2, an exhaust slit 18 is formed in the wall of the sheath *13 that pushes toward 11 over the entire stroke of the movable contact 14. Contacts 15 and 14 are connected to exciting coil 12 in series.

When the current is large enough for the switchgear l to perform a current limiting action, the arc generated between the m contactors 15 and 14 forms plasma, and the pressure is applied to the piston 19 of the movable contact 14.
is pushed against the force of the force accumulator 17. Movable contact 14
Since it is made of a magnetic material, it simultaneously receives a force that supports its one pole from the excitation coil 12 constituting the coil plunger. Therefore, the plasma and exciting coil 1
2 and 2 constitute a tripping device. If the requirements are small, it is sufficient to use only one of the two methods.

When the movable contact 14 moves over its stroke in the direction of opening of the contact device consisting of contacts 15 and 14, the pressure of the plasma is additionally discharged by means of the exhaust slit 18. Then, MIK is maintained so as to limit the current when the contact device 3 becomes unable to maintain sufficient plasma pressure to maintain one pole. A closing motion is introduced by the implication 17 as the plasma pressure decreases. In order to slow down the closing process, the exhaust sleeve 18 is preferably designed to provide a high resistance during the closing movement. Known fluid technology is used for this purpose. Therefore, as shown in FIG. 2, the exhaust slit is inclined in a hydrodynamically advantageous manner, if not in the unipolar direction, and is therefore arranged at an acute angle in the closing direction.

In FIG. 2, the first switchgear l is a wiring breaker 20.
It can be placed under the base of the device.

This is because the first switching device occupies only a small amount of space. The shield type 13 of the holding device 4 is provided with a gas-releasing substance in a known manner, at least on its inner wall, in order to support the plasma pressure and hold one pole of the contact device 1.

A simpler structure can be obtained than the cylindrical breaker '111BK. Specifically, the movable contact 14 of the first switching device 1 includes a support 2 toviston 19 made of a magnetic material and a seat 22 of the force accumulator 11. The support is provided with a contact piece 14 on its end face. The contact piece 14 is preferably made of a weld-resistant material.

The exhaust sleeve 18 is hydrodynamically configured to produce a low fluid resistance when the movable contact 14 moves in the opening direction, and a high fluid resistance when it moves in the closing direction. Most simply, this is achieved by tilting the exhaust slit as shown in FIG. In the direction of one pole, the cutoff gas is discharged by changing the direction slightly, but in the direction of closing the pole, on the other hand, the cutoff gas must be discharged by changing the direction significantly. Uke f of wealth device 17
f122 forms a piston with higher airtightness than M2 at the appropriate location. A gap may be left around the piston 19, which acts after the contact piece has opened slightly.

Since the piston 19 is sealed by the cylindrical packing 23 when closed, even a slight overcurrent causes the contact device 2 to open, thereby limiting the current.

〔Effect of the invention〕

As explained above, in the device according to the present invention, the first switching device has a simple holding device that maintains the open state of the contact device until a predetermined time, and the second switching device is configured as a normal circuit breaker. It is possible to provide a wiring breaker that is suitable for upper level automatic disconnection and has a simple structure that is free from the possibility of pumping operation. In other words, the holding device for the #11 switchgear has a simple and compact structure consisting of an excitation coil placed around the switching device and a movable contact with a simple force storage device, and is easily attached to the second switchgear. It is possible to incorporate it into a single unit. In addition, an exhaust slit is provided in the wall of the new model, and while the contact device is in the open state, the gas expanded by the arc generated between the fixed and movable contacts can be appropriately exhausted. The open state of the contact device of the switching device remains stable until a predetermined switching-off moment of the second switching device occurs. Furthermore, the first and second switching devices need only be electrically connected in series, and there is no need to provide a separate opening/closing latch in the parallel branch, as is the case with higher-level automatic circuit breakers that avoid conventional pumping operations. Therefore, the overall configuration is greatly simplified, and together with the fact that a normal wiring breaker can be used for the second switchgear, it is possible to use a small and inexpensive wiring breaker suitable for upper level automatic shutoff. can be provided.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of a circuit breaker based on the present invention, FIG. 2 is a front view with the first switching device of the circuit breaker shown in FIG. 1 cut away, and FIG. FIG. 3 is a side view of the breaker shown in FIG. In the drawings, 1 is a first switching device, 2 is a second switching device, 3 is a contact device, 4 is a holding device, 5 is a tripping device, and 8
1 is an opening/closing latch, 9 is a contact with an arc extinguisher, 12 is an excitation coil, and 13 is a new model.

Claims (1)

[Scope of Claims] 1) A first switching device in which the tripping device directly engages with the contact device and the open state of the contact device is held by a holding device until a predetermined cutoff point; and a tripping device. and a second switching device that engages with a contact with an arc extinguishing device via an opening/closing latch. one switchgear is connected in series with a second switchgear,
The holding device of this first opening/closing device includes an excitation coil arranged around the new vehicle and a magnetic material that forms a movable coil plunger inside the new vehicle and is pressed toward the fixed contact by a force accumulator. at least one movable contact consisting of at least one movable contact, which is provided with an exhaust slit in the wall of the new car throughout the journey of the movable contact, and the contactors on both edges and the excitation coil are electrically interconnected. A circuit breaker for wiring suitable for high-end automatic circuit breakers featuring the following. 2) 4$#v - The circuit breaker according to claim 1, characterized in that the first switchgear is disposed under the base of the second switchgear, which is an ordinary wiring breaker. A circuit breaker suitable for high-level automatic circuit breakers. 3) In the breaker according to claim 1,
A breaker for wiring suitable for a high-level automatic breaker, characterized in that the inner wall of a first switchgear of a new vehicle is made of a substance that releases gas. 4) In the breaker according to claim 1,
A circuit breaker suitable for a high-level automatic circuit breaker, characterized in that a circuit breaker of a first switchgear is configured in a cylindrical shape. 5) In the circuit breaker according to Section 1 of Claim S, the movable contact of the first switchgear is constituted by a support made of a magnetic material and a contact piece made of a welding-resistant material. A wiring circuit breaker suitable for high-end automatic circuit breakers. 6) In the breaker according to claim 1,
The upper automatic breaker is characterized in that the exhaust slit is formed with an inclination so as to produce a low fluid resistance when the movable contact moves in the tia direction, and a high fluid resistance when the movable contact moves in the closing direction. A circuit breaker suitable for wiring.