JPH0119613B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises at least two contact parts outside one opening/closing latch, at least one of these contacts having an arc extinguishing device and arranged on the main circuit. One instantaneous tripping device acts on the contact independently of the opening/closing latch, and on the subcircuit bridging this contact there is provided at least one delayed tripping device which engages with said opening/closing latch. The present invention relates to a wiring sheath disconnector suitable for use as a superior automatic sheath disconnector, in which a latch engages a contact of at least one other contact on said main circuit.

The upper automatic sheath disconnector is installed between the house entrance fuse and the branch section having a plurality of wiring sheath disconnectors. When a short circuit occurs after one wiring sheath breaker in a branch, the upper automatic shoring breaker opens its contact circuit to back up the shedding action of this wiring shear breaker. After the short-circuit point is disconnected, the upper automatic disconnector returns to the closed state again. On the other hand, if a short circuit occurs between the upper automatic shield disconnector and the wiring shield disconnector, the upper automatic shield disconnector will take care of the disconnection by itself without blowing the house entrance fuse. There must be. The branch wiring disconnector must be selected and operated before the upper automatic disconnector, and the upper automatic disconnector itself must be selected to operate before the house service entrance fuse. must be selected and operated first. This selected operation is required not only for short-circuit currents, but also for long-lasting overcurrents.

These conflicting requirements can be overcome in a known wiring device called a high-level disconnector, in which an electromagnetic tripping device acts directly on the contact, and a thermal tripping device engages the contact via an opening/closing latch. (See German Published Patent Application No. 2854637). When it is necessary to break a short circuit between such a wiring device used as a higher-order automatic shoring device and a lower-order wiring shoring device, an instantaneous electromagnetic tripping device releases the contact. Open and break the circuit. The contact will close again when the contact breaks, but will open again as long as the short circuit continues. In this way, the contactor opens and closes multiple times while drawing an arc, thereby achieving high-speed re-closing. A delayed thermal trip device heats up with each closing operation, eventually causing a final failure condition. Such an operation is called a pumping operation, which results in multiple loading of the contacts and poor selection behavior of the upper automatic shingle breaker with respect to the house entry fuse. Figure 7 of West German published patent publication No. 285411, which has the characteristics mentioned at the beginning,
Several other known protectors and disconnectors, such as those shown in FIG. 6 of No. 2854616 and FIG. 4 of No. 285463, also operate on this principle.

In these circuit breakers with at least two contacts, the contacts with arc extinguishers on the main circuit serve to back up the lower wire circuit breakers. A time-delay trip device on the subcircuit that engages the open/close latch ultimately interrupts the short circuit between this cable disconnector and the underlying wiring cable disconnector.

The present invention basically provides that the short circuit between the upper automatic sheath disconnector and the lower wiring sheath disconnector continues for a long time and therefore the time delay tripping device engages the opening/closing latch. It is based on the recognition that it is suitable. This invention relates to the above-mentioned type of breaker, in which the breaker is configured to prevent pumping operation in the event of a short circuit between the breaker and a lower wiring breaker. The purpose is to improve.

This purpose is achieved, as a general measure, by providing on the terminal-to-terminal circuit via said secondary circuit a separate instantaneous tripping device which engages only with contacts on the main circuit with said arc-extinguishing device. This is achieved by keeping the contacts of this contact part in an open state by the current flowing through the subcircuit until it reaches the disconnected or disconnected state.

It is also a preferred measure that a further instantaneous tripping device is provided on the sub-circuit itself, which engages only with the contacts on the main circuit with the arc-extinguishing device, and that this sub-circuit is This is also achieved by having high resistance.

Generally or preferably, such a wire disconnector satisfies the important condition of continuously breaking short circuits that occur between the wire disconnector and a lower wiring wire disconnector. . For this purpose, a time-delayed release device leads to the final release via the opening/closing latch.
A further instantaneous trip device provided on the subcircuit holds the contacts of the arc-extinguishing contact part open. At this time, the sub-circuit is used as a sensor circuit for detecting short-circuit current.

Certain known types of protection devices work with high-resistance subcircuits (see FIG. 3 of DE-A-2930960). As a result, the electromagnetic trip device on the subcircuit acts on the contact via the opening/closing latch. This trip device performs a delayed operation by means of a separate parallel circuit with a varistor and a pole piece having a large inertial mass compared to conventional trip devices. In such protection devices, the circuit is first opened by an instantaneous trip device on the main circuit, and in some cases the short circuit current is applied multiple times or pumping until a delayed trip device on the secondary circuit releases the opening/closing latch. Otherwise, the desired selectivity between the protection device and the underlying wiring shield is lost. This is because the higher the short-circuit current, the shorter the delay time of the tripping device, so that both protection devices are cut off simultaneously. At least the adjustment of the time delay trip device is very difficult. According to the invention, the above-mentioned disadvantages are avoided because a further instantaneous tripping device on the subcircuit acts directly on the contact and the subcircuit is not initially interrupted.

According to another known device of this type (cf. DE 2854623), a time-delayed tripping device is used in which a joint is provided between the instantaneous tripping device on the main circuit and the opening/closing latch. There is. As a result, the electromagnetic tripping device on the main circuit, which operates instantaneously after a certain period of time has elapsed, can finally open and release the contact by means of an opening/closing latch via this joint. In this case, the subcircuit has low resistance. When the opening/closing latch is actuated, an auxiliary switch on the subcircuit also opens to disconnect the electrical circuit in the subcircuit as well. This is because only one contact on the main circuit is actuated.
Even in this shingle breaker, when a short circuit occurs between it and a lower wiring shingle breaker, the shingle cannot be continuously disconnected, and the pumping operation continues until the shingle is finally disconnected.

Other known selective protection devices (see DE 28 54 616) operate without additional couplings. This device is an electromagnetic device that originally operates instantaneously by opening a low-resistance heat-sensitive element on a parallel circuit and commutating the current initially flowing through this element to a high-resistance winding of an electromagnetic tripping device on a subcircuit. The trip device is converted to a time-delayed trip device and the opening/closing latch can be released. This protective shield and disconnector also performs a conscious pumping action.

On the basis of the principle that the current in the secondary circuit is diverted after a certain period of time to a trip device connected in parallel, the other known circuit breakers mentioned above also operate (cf. DE 2930960). . Instead of a low-resistance thermal switching element, the breaker has a positive temperature coefficient resistor on the subcircuit, which resistor is connected in parallel to a high-resistance electromagnetic trip device.

In addition to each electromagnetic trip device and thermal trip device on the main circuit, each acting on one opening/closing latch, a second electromagnetic trip device can also be provided on the high-resistance secondary circuit. Are known. Since this trip device can only open the circuit via the attached opening/closing latch, such overcurrent protection devices are unsuitable as upper level automatic shutoff devices. The first contact on the main circuit is continuously opened by both tripping devices on the main circuit, and the tripping device on the subcircuit acts to continuously open the second contact. . The selectivity requirements set for higher-level automatic disconnectors are therefore not met.

On the other hand, the wires and disconnectors based on this invention are
Maintains selectivity to high short-circuit current ranges for both upstream fuses and downstream protection devices.

In the simplest embodiment of the invention, the further instantaneous tripping device on the subcircuit is constructed as an electromagnetic tripping device.

In addition to the instantaneous tripping device, a delayed tripping device can also be provided on the main circuit. In this case, however, the time-delaying release device is engaged in a known manner with a closing latch (cf. German Offenlegungsschrift 28 54 711).

In another embodiment of the invention, on the subcircuit:
In addition to the instantaneous tripping device and the delayed tripping device, an arc-extinguishing contact is provided which engages the opening/closing latch. In this case, only a contact with an arc extinguisher is provided on the main circuit, and the opening/closing latch also engages with this contact. Such contacts on subcircuits are known per se (see DE 28 54 616 A1). In the disconnector according to the invention, the subcircuit preferably has a resistance at least 10 ³ times that of the main circuit. The contacts on the subcircuit can then be configured as simple disconnectors.

It is particularly economical to construct the instantaneous tripping device on the auxiliary circuit and the instantaneous tripping device on the main circuit as one piece as an electromagnetic tripping device. For this purpose, an integrated electromagnetic tripping device has only one magnetic circuit (yoke, iron core, pole piece), on which each excitation winding of the tripping device of the subcircuit and the main circuit is provided. .

The time delay tripping device on the sub-circuit and the time delay tripping device on the main circuit may also be constructed integrally. In this case, the tripping device of the main circuit is constructed as a directly heated bimetal, and the tripping device of the auxiliary circuit is constructed as a heating winding provided electrically insulated on this bimetal.

If the subcircuit has a high resistance, only one contact with an arc extinguisher is sufficient, and another contact on the subcircuit or on the main circuit in the area where this subcircuit is not branched off. It is important that this can be constructed as an inexpensive disconnecting section.

Next, the present invention will be explained in detail based on eight embodiments of a comb and a disconnector based on the present invention with circuit diagrams shown.

A wiring sheath breaker 1 suitable for a higher-level automatic sheath breaker shown in FIG. At least one contact 3 has an arc extinguishing device and is arranged on the main circuit 5. An instantaneous tripping device 6, which is an electromagnetic tripping device in this embodiment, acts on the contacts of the contact portion 3 without using the opening/closing latch 2. The time delay tripping device 7 is provided on the subcircuit 8 bridging the contacts 3 on the main circuit. In the bridged area the main circuit forms a main branch. A parallel branch of main circuit and sub-circuit lies between branch points 9 and 10.

It is important that the contacts of the contacts 3 on the main circuit 5 are kept open by the current flowing through the subcircuit 8 until the final extinguishment. For this purpose, the subcircuit 8
A further instantaneous tripping device 13 is provided on the circuit between the terminals 11 and 12, which acts only on the contact 3. In this exemplary embodiment, this instantaneous tripping device 13 is provided on the subcircuit 8 itself, ie on the subbranch, and is illustrated as an electromagnetic tripping device.

In the embodiment shown in FIG. 1, the subcircuit 8 is formed to have a higher resistance than the main circuit 5 between the branch points 9 and 10. Therefore, if necessary, resistor 14
can be inserted. Instantaneous trip device 13 on subcircuit 8
The connection between the contact part 3 and the contact part 3 is illustrated by the line of action 15. The connection between the instantaneous trip device 6 and the contact 3 on the main circuit 5 is illustrated by the line of action 16 .
Similarly, on the subcircuit 8 between the junctions 9 and 10 there is provided a time delay tripping device 7 which engages the opening/closing latch 2, this engagement being illustrated by the line of action 18. . On the main circuit 5 between the terminals 11 and 12, a switching latch 2 releases a further contact 4, which in this embodiment is located outside the junctions 9 and 10. This engagement is illustrated by line of action 17. The sub-circuit 8 is configured to have a high resistance, and preferably has a value that is 10 ³ times or more the resistance of the main circuit, for example.
This is optionally achieved by inserting a resistor 14. In this way, the second contact 4 on the main circuit can be constructed as a simple disconnect, which is economically advantageous.

It is obvious that the cutoff switch illustrated in FIG. 1 can be divided into two or three subassemblies as an opening/closing mechanism. In principle, the breaker operates as follows.

When a short circuit occurs after a wiring breaker connected after the upper automatic breaker used as the upper automatic breaker shown in FIG. The contact is opened, whereby the arc is drawn into the attached arc extinguishing device and the main circuit 5 is finally broken. In this way, the contact portion 3 backs up the underlying commercially available wiring sheath disconnector. At this time, the opening/closing latch 2 is not released because it is engaged with the time delay trip device 7, and the contact 4 remains closed, so that the short circuit current continues to flow through the subcircuit 8. Therefore, the instantaneous tripping device 13 is activated and the contact portion 3 is prevented from being closed. When the wiring shield disconnector finishes cutting off the short-circuit current, the contact part 3 closes again, and the wiring shield disconnector used as the upper automatic shield disconnector shown in FIG. Maintain the input state.

If a short circuit occurs between the wiring disconnector and the automatic disconnector used as the upper automatic disconnector,
The short-circuit breaker of FIG. 1 initially operates in the same manner as described above, and the contact portion 3 interrupts the short-circuit current. As soon as the contact 3 on the main circuit opens its contact, current flows through the subcircuit 8 due to the still continuing short-circuit current.
This current becomes smaller as the resistance of the subcircuit becomes higher.
This current, which is very small compared to the short-circuit current that initially flowed in the main circuit, keeps the contacts of the contact part 3 open via the instantaneous tripping device 13. When the time delay tripping device 7 is actuated by the current flowing through the subcircuit 8 and continuing for a predetermined time or more, the opening/closing latch 2 is released, thereby opening the contact of the contact portion 4. Thus, the shattered breaker is finally shattered.

In the embodiment shown in FIG. 2, an instantaneous tripping device 6 is provided on the main circuit 5 outside the branch. According to this embodiment, the current continues to flow through the instantaneous tripping device 6 even after the contact portion 3 of the main circuit 5 is opened, so that the contact portion separation is maintained.

In the embodiment shown in FIG. 3, in addition to the instantaneous tripping device 6 on the main circuit 5, a further delayed tripping device 20 is installed in order to obtain certain overcurrent characteristics in a known manner.
has been established. This tripping device engages the opening/closing latch 2 by a line of action 21. Time delay tripping device 20
can most simply be a thermal tripping device, but in FIG. 3 it is placed on the main circuit between branch points 9 and 10, and in FIG. 4 it is placed on the main circuit outside the branch point. ing.

In the embodiment shown in FIG. 5, a contact portion 22 without an arc extinguishing device is provided on the subcircuit 8 in addition to the instantaneous tripping device 13 and the delayed tripping device 7. In this case, no second contact is required on the main circuit. The opening/closing latch 2 is connected to the contact portion 22 by the line of action 23.
is engaged with. In this case, it is sufficient to provide only the contact section 3 with an arc extinguisher on the main circuit 5. However, in this case, branch points 9 and 10
In order to finally disconnect the main circuit and the sub circuit 8 between the opening/closing latch 2 and the contact portion 3
Both are engaged by a line of action 24. However, as before, it is important that the instantaneous tripping devices 6 and 13 act directly on the contact portion 3 without intervening the opening/closing latch 2.

The sub circuit 8 is at least 10 ³ compared to the main circuit 5.
It is better to have double the resistance. This is optionally achieved by inserting a resistor 14. The further contact 22 can then be designed as a simple disconnect, which is economically advantageous.

The breaker shown in FIG. 5 also has a time delay tripping device 20 on the main circuit 5, as shown in the embodiment of FIG.
can be provided. This additional time delay tripping device can also be provided inside the junctions 9 and 10, as shown in the embodiment of FIG. Finally, the instantaneous tripping device 6 on the main circuit 5 is the embodiment 8 of FIG.
It can also be provided between branch points 9 and 10 as shown in FIG. This makes it possible to obtain overcurrent characteristics similar to the implementation shown in FIGS. 3 and 4.

The further instantaneous tripping device 13 on the auxiliary circuit 8 and the instantaneous tripping device 6 on the main circuit 5 can be constructed integrally as an electromagnetic tripping device. In this case, the integrated electromagnetic tripping device consists of only one magnetic circuit (yoke, iron core, magnetic pole piece). The excitation winding of the trip device 13 on the sub circuit 8 and the trip device 6 on the main circuit 5 are placed on the iron core.
An excitation winding is provided. In this way, expensive parts are used twice, which is economical.

The time delay trip device 7 on the subcircuit 8 and the time delay trip device 20 on the main circuit 5 can also be constructed in one piece. The tripping device on the main circuit 5 can be configured as a directly heated bimetal, and the tripping device on the subcircuit 8 can be configured as a heating winding mounted on this bimetal in an electrically insulated manner.

[Brief explanation of drawings]

FIGS. 1 to 8 are circuit diagrams showing eight embodiments of the wiring shield disconnector according to the present invention. In the drawing, 1 is the entire wiring breaker suitable for upper automatic breaker, 2 is the opening/closing latch, 3, 4,
22 is a contact part, 5 is a main circuit, 6 is one instantaneous tripping device, 7 is a delayed tripping device on 8, 8 is a subcircuit, 11, 12 are terminals, 13 is another instantaneous tripping device, 14 is the resistance, 20 is the time delay tripping device on 5,
15, 16, 17, 18, 23, and 24 are lines of action indicating engagement.

Claims (1)

[Claims] 1. At least two contact parts are provided outside one opening/closing latch, and at least one of these contact parts has an arc extinguishing device and is arranged on the main circuit. At least one instantaneous tripping device acts independently of the opening/closing latch and engages said opening/closing latch on the subcircuit bridging this contact.
A wiring system suitable for a superordinate automatic breaker for series breaker, having two time delay tripping devices, the opening/closing latch of which engages the contact of at least one other contact on the main circuit. In the circuit breaker, another instantaneous tripping device that engages only with the contact of the contact portion on the main circuit having the arc extinguishing device is provided on the terminal-to-terminal circuit passing through the subcircuit. Due to the current flowing through the subcircuit until it reaches the disconnection state,
A wire breaker for wiring, characterized in that a contactor of a contact portion having this arc extinguishing device is held in an open state. 2. In the breaker according to claim 1, another instantaneous tripping device that engages only with the contact portion on the main circuit having the arc extinguishing device is provided on the sub-circuit itself. A circuit breaker for wiring, characterized in that the sub-circuit has a higher resistance than the main circuit. 3. A wire breaker for wiring according to claim 2, characterized in that another instantaneous tripping device provided on the sub-circuit is configured as an electromagnetic tripping device. . 4. A wiring circuit breaker according to claim 1, characterized in that a time-delay tripping device that engages with the opening/closing latch is provided on the main circuit in addition to the instantaneous tripping device. Disconnector. 5. In the breaker described in claim 2, a contact portion without an arc extinguishing device is provided on the sub-circuit in addition to another instantaneous tripping device and a delayed tripping device, and this contact portion is opened/closed. being engaged with a latch;
A wiring disconnector characterized in that only a contact portion with an arc extinguishing device is provided on the main circuit, and this contact portion also engages with the opening/closing latch. 6 In the breaker according to claim 2, the auxiliary circuit has a power of at least 10 ³ compared to the main circuit.
A wiring disconnector characterized by having double the resistance. 7 In the circuit breaker according to claim 6, the contact on the main circuit having the arc extinguishing device is bridged by the auxiliary circuit, and the contact part that engages with the opening/closing latch is configured as a mere disconnecting part. A circuit breaker for wiring, characterized in that it is provided outside the circuit to be bridged. 8. In the breaker as set forth in claim 2, another instantaneous tripping device on the sub circuit and the instantaneous tripping device on the main circuit are integrally configured as an electromagnetic tripping device. A disconnector for wiring featuring the following. 9 In the shield breaker according to claim 7, there is only one integrated electromagnetic tripping device.
Only one magnetic circuit (core, yoke, pole piece) is provided, and each excitation winding of another instantaneous tripping device on the sub-circuit and the instantaneous tripping device on the main circuit is provided on this iron core. Features: Wiring disconnector. 10 In the breaker according to claim 4, the time delay tripping device on the sub circuit and the time delay tripping device on the main circuit are integrally configured, and the tripping device on the main circuit is A wire cutter for wiring, characterized in that it is configured as a directly heated bimetal, and the tripping device on this sub-circuit is configured as a heating winding that is electrically insulated and installed on the bimetal. .