EP3278349A2 - Switchgear cabinet arrangement with improved cut-off in the event of an overload - Google Patents

Switchgear cabinet arrangement with improved cut-off in the event of an overload

Info

Publication number
EP3278349A2
EP3278349A2 EP16711623.5A EP16711623A EP3278349A2 EP 3278349 A2 EP3278349 A2 EP 3278349A2 EP 16711623 A EP16711623 A EP 16711623A EP 3278349 A2 EP3278349 A2 EP 3278349A2
Authority
EP
European Patent Office
Prior art keywords
path
3a
circuit breaker
3f
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP16711623.5A
Other languages
German (de)
French (fr)
Inventor
Georg Reuberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eaton Intelligent Power Ltd
Original Assignee
Eaton Industries Austria GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE102015104920 priority Critical
Application filed by Eaton Industries Austria GmbH filed Critical Eaton Industries Austria GmbH
Priority to PCT/EP2016/056319 priority patent/WO2016156131A2/en
Publication of EP3278349A2 publication Critical patent/EP3278349A2/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/1009Interconnected mechanisms
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02Housings; Casings; Bases; Mountings
    • H01H71/0264Mountings or coverplates for complete assembled circuit breakers, e.g. snap mounting in panel
    • H01H71/0271Mounting several complete assembled circuit breakers together
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/56Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring the operation of the switch at a predetermined point in the cycle
    • H01H9/563Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring the operation of the switch at a predetermined point in the cycle for multipolar switches, e.g. different timing for different phases, selecting phase with first zero-crossing
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/018Application transfer; between utility and emergency power supply

Abstract

Disclosed is a switchgear cabinet arrangement (1a..1f) comprising an input (E) for connecting to an energy supply network and at least one output (A). The switchgear cabinet arrangement (1a..1f) also has multiple electrical conductors (2, L1..L3, N) and multiple circuit-breakers (3a..3f) arranged along the run of the conductors, by means of which circuit-breakers the input (E) can be electrically connected to the at least one output (A) via a first path. The switchgear cabinet arrangement is also provided with at least one sensor (4a..4c) which is arranged on one of the electrical conductors (2, L1..L3, N) and is designed to detect a measured value for a current flowing through the conductor (2, L1..L3, N) and/or a measured value for a temperature of the conductor (2, L1..L3, N). The at least one output (A) is connected inside the switchgear cabinet by the actuation of the circuit breaker (3a..3f) to the input via a second path that differs from the first path, if the detected current exceeds a first threshold value and/or the detected temperature exceeds a second threshold value. Also disclosed is a circuit breaker (3a..3f) comprising an integrated sensor (4a..4c).

Description

 Control cabinet arrangement with improved shutdown in case of overload

TECHNICAL AREA

The invention relates to a switchgear assembly which comprises a switchgear cabinet, an input for connecting the switchgear cabinet to a

 Power supply network, at least one output, which serves to supply a device connected to it with electrical energy, and a plurality of electrical conductors and a plurality of arranged in the course breaker, with which the input to the at least one output via a first path is electrically connected. In addition, the switchgear assembly comprises at least one sensor arranged on one of the electrical conductors, which sensor is set up to acquire a measured value for a current flowing through the conductor and / or a measured value for a temperature of the conductor. In addition, the invention relates to a method for operating a

Control cabinet assembly of the type mentioned and a circuit breaker with a housing, at least one arranged in the housing switching contact, as well as a coupled to the at least one switching contact overcurrent release and / or

Over-temperature trigger.

STATE OF THE ART

Such a circuit breaker is known in principle. Also known is a

Switchgear assembly of the above type. For example, discloses the

DE 10 2006 011 127 AI in this context, a switchgear assembly with at least one control cabinet and a control cabinet monitoring device, which is used to monitor control cabinet-specific state variables including

Temperature, humidity, access, vibration, smoke, electricity and / or voltage is formed. The control cabinet monitoring device has one in the control cabinet

arranged central monitoring and control component, which is associated with corresponding sensors and controllable actuators and / or reporting units. The central monitoring and control component is designed as a base station with a wireless transmission / reception interface, and the Sensors are equipped with a wireless transmitting and / or receiving interface for wireless data transmission between the sensors and the base station.

The remote transmission cabinet specific state variables is therefore known in principle. The disadvantage of this, however, that the state variables to the

Monitoring and control component are reported, but these are not used for a specific operating method, but it is left to an operator to draw the correct conclusions from the obtained measurements.

In particular, DE 10 2006 011 127 A1 does not deal with the treatment of overloads and / or unbalanced loads or unbalanced loads.

DISCLOSURE OF THE INVENTION

An object of the invention is therefore to provide an improved control cabinet assembly, an improved operating method for a control cabinet and an improved circuit breaker and an improved use of circuit breakers.

In particular, an overload of the installed components should be avoided, which is caused in particular due to a unbalanced load / unbalanced load.

The object of the invention is achieved with a control cabinet arrangement of the type mentioned above, which additionally has a control which is adapted to the at least one output within the cabinet by operating the circuit breaker via a second, deviating from the first path, with the input connect when the detected current is above a first threshold and / or the detected temperature is above a second threshold.

Furthermore, the object of the invention is achieved by an operating method for such a control cabinet, wherein the at least one output within the

Switching cabinet is connected to the input by actuation of the circuit breaker via a second path deviating from the first path when the detected current is above a first threshold value and / or the detected temperature is above a second threshold value.

Finally, the object of the invention is also achieved with a circuit breaker of the type mentioned, in addition comprising a sensor arranged in the housing of the circuit breaker or at its electrical terminals, which for detecting a is formed via the switching current flowing current and / or for detecting a temperature of the circuit breaker.

The proposed measures overloading of the circuit breaker and the system in the cabinet is avoided, and normal operation can be maintained even near an overload long. The circuit breakers are essentially only the emergency shutdown in the event of an extraordinary event, such as a short circuit at the output of the cabinet or the shutdown due to an overload that can not be handled by path switching.

This is achieved by the fact that the temperature of a conductor and / or the current flowing through the conductor is determined with the first sensor and transmitted to the controller. In this way, very good overloads or unbalanced loads can be detected in the system. If the current measured with the first sensor exceeds the first threshold value and / or the temperature measured with the first sensor exceeds the second threshold value, then the controller sends a signal to open to a first circuit breaker in the first path and a signal to close to a second path lying second circuit breaker. The output is then connected via the second path in which the second circuit breaker is located. In a very analogous way, the output can be connected in sequence via the first path or via another path to the input.

An overload in a path may not only be due to the tripping characteristic and the rated current of a circuit breaker located in this path, but may also be caused by a too loose fit in this path or loosening over time. Therefore, it is also particularly advantageous if the at least one output within the cabinet by

Actuation of the circuit breaker is connected to the input via a second path deviating from the first path when the temperature rises excessively at substantially the same current. In particular, an "excessive" rise is characterized by exceeding by at least 10% the heating caused by the resistances of the electrical conductors and the contact resistances between two conductors when properly connected.

For example, recurring time histories of power consumption and the Temperature (about 24h cycles) or even individual points thereof are used for the above-mentioned evaluation.When the temporal patterns of power consumption day after day are essentially the same, but the temperature rises slowly and continuously, can with high security of a dissolving connection are assumed.

Depending on the type of device connected to the output, switching from the first path to the second path can be switched to one phase, two phases can be switched, or three phases can be switched.

Due to the arrangement of the sensor in the housing of the circuit breaker or at the terminals of the current flowing through a switch contact of the circuit breaker current can be directly determined in particular directly a temperature of the circuit breaker and transmitted to the control of the control cabinet assembly. The path switching can then take place particularly close to an overload.

The switching of the path with only circuit breakers is advantageous, but not mandatory for the invention. The switching between the first path and the second path can also take place in other ways, for example by incorporating switches without protective function or by specially designed switches.

Further advantageous embodiments and modifications of the invention will become apparent from the dependent claims and from the description in conjunction with the figures.

It is particularly advantageous

 if the circuit breaker has an overcurrent release (in particular a comparatively rapidly reacting electrodynamic release) which is adapted to open at least one switching contact of the circuit breaker as soon as a current through the at least one switching contact is above a third threshold, and

 when the first threshold is below the third threshold.

Similarly, it is beneficial

if the circuit breaker has a temperature release (in particular a comparatively slow bimetallic release) which is designed to to open at least one switching contact of the circuit breaker as soon as a temperature of the temperature trigger is above a fourth threshold, and

 when the second threshold is below the fourth threshold.

In the manner indicated, it is ensured that the circuit breaker in the current-carrying path does not switch off near the overload or with a slight overload without the controller initiating a changeover of the paths. This would mean that the device connected to the output would no longer be supplied with electrical energy, although this would have been possible via an alternative path.

It is also favorable if the at least one sensor is arranged in the first path. The path switching can therefore be performed close to the limit of the overload in the first path.

It is also advantageous if the at least one sensor is arranged in the region of a first circuit breaker, which is also located in the first path. It is particularly advantageous in this context if the shortest distance between the at least one sensor and the first circuit breaker is a maximum of 100 mm. This also favors a path switch close to the overload. In particular, the circuit breaker threatened by overload is directly relieved by the path switchover. In the same way, it is advantageous if, alternatively or additionally, the shortest distance between the at least one sensor and a screw in the first path is a maximum of 100 mm. In this way it can be determined if a

Screwing of conductors in the first path is still sufficiently tightened. If this is not the case, then a changeover from the path, which is overloaded due to the loose screw connection, can take place on an alternative path.

It is also favorable if the current-carrying capacity for the first and second paths is the same. In particular, this can be accomplished by the fact that a rated current of a first circuit breaker located in the first path is the same as a rated current of a second circuit breaker located in the second path. In this way, the device connected to the output of the cabinet is not or hardly affected by the switching of the path.

In addition, it is favorable if the voltage applied to the output for the first and second paths is the same. This is another measure that helps the device connected to the output of the control cabinet is not or hardly affected by the switching of the path.

It is also advantageous if the (absolute) phase position of the voltage applied to one terminal of the output voltage for the first path and the second path

is different. As a result, the path switching can be realized by simple measures. For example, when switching over a device operated in a single phase on the phase LI and the neutral conductor N of a three-phase network to the phase L2, a phase shift of 120 ° results.

Finally, it is particularly advantageous if the relative phase position of the voltages applied between terminals of the output is the same for the first path and the second path. For example, a three-phase operated device can be switched from the phases LI, L2, L3 to the phases L2, L3, LI, which in absolute terms results in a phase shift of again 120 °, the relative

Phase shift between the outputs, however, remains the same as the

Phase shifts between LI and L2, L2 and L3 and L3 and LI are each 120 °. This measure is particularly advantageous when it is connected to the output device is a three-phase motor or the connected device includes such engines, since then it does not lead to an undesirable reversal of the direction of rotation of the motor.

It should be noted at this point that the variants disclosed for the switch cabinet arrangement and the resulting advantages relate equally to the operating method for the switch cabinet or to the circuit breaker and vice versa.

BRIEF DESCRIPTION OF THE FIGURES

The present invention will be explained in more detail with reference to the exemplary embodiments indicated in the schematic figures of the drawing. It shows:

1 shows a first, schematically illustrated example of a control cabinet arrangement for a single-phase connected device. similar to Figure 1, with only three possible paths; Fig. 3 shows a second, schematically illustrated example of a

 Control cabinet arrangement for a two-phase connected

Fig. 4 shows another, schematically illustrated example of a

 Control cabinet arrangement for a three-phase connected

Fig. 5 is a front view of a cabinet assembly, from an advantageous

 Position of the sensors in relation to a circuit breaker emerges;

Fig. 6 shows a detail of another exemplary cabinet arrangement obliquely from the back and

Fig. 7 shows the detail of Fig. 6 a little more from the side.

DETAILED DESCRIPTION OF THE INVENTION

Fig. 1 shows a first, schematically illustrated example of a

Schaltschrankanordnung la, which an input E to the connection of

Cabinet 1 to a power grid comprises, an output A, which serves to supply a device connected to it with electrical energy, and a plurality of electrical conductors 2 and a plurality arranged in the course thereof

Circuit breaker 3a, 3b, with which the input E with the at least one output A via a first path is electrically connected. The electrical conductors 2 are here associated with the three phases LI, L2 and L3 and the neutral conductor N of a three-phase network.

Furthermore, the control cabinet arrangement la comprises two sensors 4a, 4b arranged on the electrical conductors 2, which sensors are set up to detect a measured value for a current flowing through the conductors 2 and / or a measured value for a temperature of the conductor 2. Finally, the control cabinet assembly la also includes a controller 5, which is adapted to connect the at least one output A within the cabinet 1 by pressing the circuit breaker 3a, 3b via a second, deviating from the first path with the input E, if the detected current is above a first threshold and / or the detected

Temperature is above a second threshold.

The function of the control cabinet arrangement 1a shown in FIG. 1 is as follows: For the time being, a state is assumed in which the first circuit breaker 3a is closed and the second circuit breaker 3b is open. The output A is therefore connected to the input E via a first path in which the first circuit breaker 3a is connected. For example, between the phases LI, L2 and L3 is in each case a voltage of 400 V, between a phase LI, L2, L3 and the neutral conductor N a voltage of 230 V. At the output A is therefore an electrical device operable that for a voltage of 230 V and single-phase operation is designed.

With the first sensor 4a, the temperature of the conductor 2 and / or the current flowing through the conductor 2 and the first circuit breaker 3a current is determined and transmitted to the controller 5 by means of dotted lines shown data lines. If the current measured with the first sensor 4a exceeds the first threshold value and / or the temperature measured with the first sensor 4a exceeds the second threshold value, the controller 5 sends a signal to open to the first threshold

Circuit breaker 3a and a signal for (synchronous) closing to the second

Circuit breaker 3b. The output is then connected via the second path in which the second circuit breaker 3b is located. Under "synchronous"

Open / close can be understood in particular a simultaneous or slightly delayed switching. In particular, this includes a switch in

successive zero crossings of different phases LI, L2, L3. Of the

Consumers should not be affected by the switch as far as possible or only slightly.

In a very analogous manner, the temperature of the conductor 2 and / or the current flowing through the conductor 2 and the second circuit breaker 3b is determined with the second sensor 4b and transmitted to the controller 5 with the help of the dotted lines shown. If the current measured with the second sensor 4a exceeds the first threshold value and / or exceeds that measured with the first sensor 4a

Temperature the second threshold, then the controller 5 sends a signal to open to the second circuit breaker 3b and a signal to close to the first circuit breaker 3a. The output is thus connected again via the first path in which the first circuit breaker 3a is located. The proposed measures avoid overloading of the circuit breakers 3a and 3b, and normal operation can be maintained long even near the overload. The circuit breakers 3a and 3b are essentially for emergency shutdown only when an exceptional event occurs.

To achieve the stated goal, it is advantageous if the circuit breakers 3a, 3b each have an overcurrent release, which are set up to

Switching contacts of the circuit breaker 3a, 3b separate from each other when a current through the switch contacts is above a third threshold, and further, it is advantageous if the first threshold is below the third threshold. In this way it is ensured that the lying in the current-carrying path

Circuit breaker 3a, 3b does not turn off near the overload or low overload, without the controller 5 initiates a switching of the paths. This would mean that the device connected to output A is no longer supplied with electrical energy, although this would have been possible via an alternative path.

To achieve the stated goal, it is also advantageous if the

Circuit breaker 3a, 3b each have a temperature trigger, which are adapted to disconnect switching contacts of the circuit breaker 3a, 3b, as soon as a temperature of the temperature trigger is above a fourth threshold, and further it is advantageous if the second threshold below the fourth threshold lies. This also ensures that the im

current-carrying path lying circuit breaker 3a, 3b does not turn off because of overload without the controller initiating a switching of the paths.

For the device connected to the output A, switching from the first path to the second path or vice versa has little effect. For example, the voltage applied to the output A is the same for the first and second paths (230V in the concrete example), but the (absolute) phase position of the voltage at the output A is for the first path and the second path

different (in the concrete example, this is changed by 120 °) For the vast majority of devices, for ohmic consumers, for example, a certain phase position is completely irrelevant, and it is also advantageous if the current carrying capacity for the first and second paths is the same For this purpose, a rated current of the first path lying in the first circuit breaker 3a be the same size as a rated current of lying in the second path second circuit breaker 3b.

So that substantially the same conditions exist for the first sensor 4a lying in the first path as for the first circuit breaker 3a lying in the first path, it is advantageous if the first sensor 4a lies in the region of the first circuit breaker 3a, ie is arranged close thereto. Preferably, the first sensor 4a is no further from the first circuit breaker 3a than 100 mm, with reference to the shortest distance between the sensor 4a and the first circuit breaker 3a (see also Figures 5 to 7). Of course, similar considerations also apply to the second circuit breaker 3b and the second sensor 4b.

In the same way, it is advantageous if, alternatively or additionally, the shortest distance between the sensor 4a and a screw in the first path

maximum 100 mm. In this way it can be determined with the sensor 4a, whether the said screw is still sufficiently tightened in the first path. If this is not the case, a changeover from the path, which is overloaded due to the loose screw connection, can take place on an alternative path (see also the US Pat

FIGS. 6 and 7).

Although an arrangement of the sensors 4a, 4b close to the circuit breakers 3a, 3b and / or close to fittings is beneficial, so may

Currents / temperatures in other areas of the cabinet arrangement 1a may be relevant for the path switching, and the sensors 4a, 4b may accordingly be arranged in other areas thereof. It is also conceivable, of course, that in addition to the sensors 4a, 4b there are also other sensors whose signal is processed by the controller 5. For example, a sensor may be provided, which determines the air temperature within the control cabinet assembly la, and affects the path switching. Similarly, sensors for other parameters such as current, voltage, etc. may be provided.

2 now shows a second, schematically illustrated example of a

Control cabinet assembly lb, which of that shown in FIG

Cabinet arrangement la is very similar. In contrast, the output A is now connectable to all three phases LI, L2 and L3, and not only to the phases LI and L2. One of the three circuit breakers 3a..3c is closed, the others remain open. Altogether there are thus three different paths available, and one

Path switching is therefore even more flexible. The controller 5 can switch to the path with the least load in the event of impending overload in a path.

Fig. 3 shows another schematically illustrated example of a

Switchgear assembly lc, which is similar to the aforementioned switchgear assemblies la and lb. However, the output A is connected to two phases, whereby a voltage of (preferably) 400 V is applied to it, in concrete terms a first path runs via the first switch 3a and the third switch 3c, a second path via the second switch 3b and the fourth Accordingly, the voltage between the phases LI and L2 or between L2 and L3 is switched to the output A. When the first path is selected, the controller 5 closes the switches 3a, 3c and opens the switches 3b, 3d Path is the other way round.

Another difference to the previous examples is that not all switches 3a..3d must necessarily be circuit breakers. For example, the first switch 3a and the fourth switch 3d are designed as simple switches without protective function with regard to overcurrent and / or excess temperature. Only the second switch 3b and the third switch 3c have such a function in this example. However, this is sufficient because in this way in the first path and in the second paths in each case a circuit breaker 3b, 3c is located, which disconnects the circuit in an emergency.

In this example, the voltage applied to output A is the same for the first and second paths (in the concrete example, 400V}

The phase position of the voltage applied to the output A for the first path and the second path is again different (in the concrete example, it is again rotated by 120 °]], the relative phase position, however, the same, both between the phases LI and L2 and between the phases L2 and L3 is a phase angle of 120 ° C. Preferably, the current-carrying capacity for the first and second paths can be the same, ie in particular a rated current of the second circuit breaker 3a in the first path can be equal to a rated current of the second path third circuit breaker 3c. Fig. 4 shows another schematically illustrated example of a

Schaltschrankanordnung ld, which the previously presented

 Switch cabinet arrangements la..lc is similar. Output A is now suitable for three-phase connected devices. In this case, the output with the

LI, L2, L3 (first path) or L2, L3, LI (second path) can be connected by closing either the switches 3a, 3c, 3d or the switches 3b, 3d, 3f If the load connected to the output A is unbalanced and the phases LI, L2, L3 are unevenly loaded, for example, if the output A is switched via the first path, an excessively high current flows through the phase LI, the changeover shifts to the second one Place this load on phase L2, which will allow the LI phase to cool down and allow the path to go back down.

Another difference between the switching cabinet arrangement 1 d shown in FIG. 4 is that the controller 5 is not connected via data lines to the switches 3. 3. 3 f and the sensors 4. 4. 4 c, but the communication to these is wireless. Conceivable, of course, would be a mixed operation in which a part of the switch 3a..3f / the sensors 4a..4c is wirelessly connected to the controller 5 and the remaining part by wire.

One difference is that the sensors 4a..4c do not each one

Switches 3a..3f are assigned, but in each case two switches 3a..3f. After the control 5 has knowledge of the path just switched, it can also assign the measured values (in particular for the current) obtained from the sensors 4a..4c to the respective switches 3a..3f. In this example, it is assumed that all the switches 3a ..3f are designed as circuit breakers For the interruption of the circuit in

Overload case it would be in itself but also sufficient if four switches 3a..3f as

Circuit breaker are formed, for example, the switches 3a..3d.

In this example too, the voltage applied to the output A is the same for the first and second paths (in each case in each case 400V}.) The absolute phase position of the voltage applied to the output A for the first path and the second path is again different (in FIG concrete example, this is again rotated by 120 °], however, the relative phase angle between the individual Terminals of the output A are the same. This is advantageous, for example, if three-phase motors are operated at the output whose direction of rotation should not change during the path changeover. Preferably, the current carrying capacity for the first and second path can be the same size, that is to say in particular a rated current of the circuit breakers 3a, 3c, 3e lying in the first path can be the same size as one

Nominal current of lying in the second path circuit breaker 3b, 3d, 3f.

In summary, it can be said that for the change from the first path to the second path in the examples according to FIG. 1 and FIG. 2 a phase is switched over, in the example according to FIG. 3 two phases and in the example according to FIG phases.

Fig. 5 now shows an exemplary cabinet arrangement le in front view. In a frame 6, three circuit breakers 3a..3c installed and the current conductor 2, which form horizontally and vertically extending busbars, with the

Input E connected. In the manner already described, the input E via the conductors 2 and the circuit breaker 3a..3c can be electrically connected to an output A, not shown.

In addition, three sensors 4a..4c are assigned to the circuit breaker 3a by way of example and are attached to the phases L1..L3. For example, these can be on the

Conductor 2 screwed or fastened, for example, with a clip.

It is also advantageous if the sensors 4a..4c obtain the energy required for their operation directly from the current conductors 2, for example in a manner known per se by inductive energy transfer.

As already mentioned, the sensors 4a..4c are preferably in the range of

Circuit breaker 3a arranged and not further removed from this than 100 mm. In FIG. 5, the distance s is shown. That is, preferably s <100 mm.

Of course, the other circuit breakers 3b and 3c sensors 4a..4c be assigned and of course sensors 4a..4c can also be arranged elsewhere in the cabinet and connected to a controller 5. With regard to the controller 5, it is generally to be mentioned that it can be arranged inside a control cabinet or also outside it. In both cases, a cabinet comprises the circuit breakers 3b and 3c and the sensors 4a..4c, and Control cabinet arrangement includes the control cabinet and the controller 5. Is the

Control 5 integrated in the control cabinet, so are control cabinet and

Control cabinet arrangement identical.

If the controller 5 is located outside the cabinet, it can

in particular also be part of a larger surveillance or control system.

For example, it may be formed as part of a software that runs on a computer. It is also conceivable that it is designed as a substantially self-sufficient control, which reports switching states and the like to a higher-level system. In particular, it may also include a microprocessor or microcontroller. The communication to a higher-level system can be conducted by line or by radio (in particular via a mobile network).

Finally, FIGS. 6 and 7 show a detail of another exemplary control cabinet 1f from different angles. From the two

Figures can be clearly seen that a sensor 4a, 4b can also be arranged on the horizontally extending current conductors 2. In particular, the shortest distances to exemplary sensors are plotted in FIGS. 6 and 7, specifically the distance si to the sensor 4a, the distance S2 to the sensor 4b, and the distance S3 to the sensor 4c. The minimum distances si and S2 in this case run in the general direction, the minimum distance S3 in the horizontal direction.

It should be noted at this point that FIGS. 6 and 7 also serve in particular for the illustration of how to measure the shortest distance S1..S3 and that the shortest distance S1..S3 can lie in a general position. It can also be seen in particular from FIG. 6 that the sensor 4b of the screw connection 7 is closer than the one

Circuit breaker 3a. Preferably, sensor 4b is not farther from the screw 7 than 100 mm. That is, it is preferably S4 s 100 mm, and the distance S2 may exceed 100 mm.

The examples illustrated in FIGS. 1 to 7 are intended essentially to describe the

Suggested mode of action of the switching of current paths clarify. In practice, cabinet designs are usually much more complex, and it is a variety of devices connected to several outputs A. Very often these are assigned according to the prior art in each case a fixed phase, and when a Overload the associated circuit breaker 3a, 3b turns off. With the help of the proposed controller 5, however, it is possible to detect unbalanced loads and to react preventatively. These are redundancies in the

 Schaltschrankanordnung la..lf used to avoid partial overloading, which can cause an emergency shutdown by the circuit breaker 3a..3c in the long run, by diverting the power supply in the cabinet assembly la. In addition, an alarm can be triggered or a warning message issued or canceled. This alarm or warning message can in particular serve to take further measures to avert a shutdown by the circuit breaker 3a..3c. For example, the consumption of the loads connected to the control cabinet can be reduced by a higher-level control system or by the intervention of operating personnel. In particular, consumers of little importance can be turned off.

As a concrete example, it is assumed that the three phases LI, L2 and L3 each have a current carrying capacity of 5kA and in the three phases LI, L2 and L3 circuit breakers 3a..3c are arranged with 5kA rated current. By

Unbalanced load, the current is divided on the phases unevenly, so that the phase LI is charged with almost 5kA, the phase L2 with about 4kA and the phase L3 with about 3kA. At the 5kA phase an emergency stop by the circuit breaker 3a is therefore to be expected in the long term. This would result in unwanted shutdown of the connected devices. By switching the paths within the

Cabinet arrangement, a portion of the load of the phase LI can be transferred to another phase, for example to the phase L3. In a favorable case, the outputs A can be switched so that there is a symmetrical loading of the phases L1..L3 of 4kA each. Even if this is not possible and an unbalanced load is unavoidable, then an emergency stop by a

Circuit breaker 3a..3c by switching the paths, as explained in Fig. 4, usually avoided or at least delayed.

In general, it should be noted that the application of hysteresis for the first and second thresholds in the various paths is advantageous in order to avoid a rapid switching of paths, It should also be noted that the sensors 4a..4c need not necessarily be arranged outside the circuit breaker 3a..3f, but may also be included therein. That is, a circuit breaker 3a..3f then has in addition to the current release, which is often designed as an electrodynamic release, and the

Temperature trigger, which is often designed as a bimetallic release, a sensor 4a..4c for detecting the current through the circuit breaker 3a..3f and / or the temperature of the circuit breaker 3a..3f on. This can in turn communicate by wire or by radio with a controller 5.

Finally, it is noted that the control cabinet 1 and its components are not necessarily shown to scale and therefore they may also have other proportions. Furthermore, the control cabinet 1 may also comprise more or fewer components than shown. Location information (eg "top", "bottom", "left", "right", etc.] are related to the respective figure described and are to be adapted to the new situation in a change of position accordingly Finally, it is noted that the above embodiments and further developments of the invention can be combined in any manner.

Claims

claims
1. Cabinet arrangement (la..lf), comprising
 a control cabinet,
 an input (E) to connect the cabinet to a
Power grid,
 at least one output (A], which supplies one of them
connected device with electrical energy,
 a plurality of electrical conductors (2, L1..L3, N) and a plurality of protective switches (3a..3f) arranged in the course thereof, with which the input (E) can be electrically connected to the at least one output (A) via a first path, and
 at least one arranged on one of the electrical conductors (2, L1..L3, N] sensor (4a..4c], which for the detection of a measured value for a current flowing through the conductor (2, L1..L3, N] current and / or a measured value for a temperature of the conductor (2, L1..L3, N] is set up,
marked by
 a controller (5), which is adapted to the at least one
Output (A) within the cabinet by operation of the circuit breaker (3a..3f) via a second, deviating from the first path, path to the input (E] to connect when the detected current is above a first threshold and / or the detected Temperature is above a second threshold.
2. switchgear assembly (la..lf) according to claim 1, characterized in that a circuit breaker (3a..3f) has an overcurrent release, which is adapted to open at least one switching contact of the circuit breaker (3a..3f), if a Power over the at least one switching contact over a third
Threshold is, and
that the first threshold is below the third threshold.
3. Switchgear assembly (la..lf) according to claim 1 or 2, characterized in that
 a circuit breaker (3a..3f) has a temperature trigger which is arranged to open at least one switching contact of the circuit breaker (3a..3f) when a temperature of the temperature trigger is above a fourth threshold, and
 that the second threshold is below the fourth threshold.
4. switchgear assembly (la..lf) according to one of claims 1 to 3, characterized in that the at least one sensor (4a..4c] is arranged in the first path.
5. switchgear assembly (la..lf) according to one of claims 1 to 4, characterized in that the at least one sensor (4a..4c] in the region of a first circuit breaker (3a..3f) is arranged, which also in the first path lies.
6. switchgear assembly (la..lf) according to claim 5, characterized in that the shortest distance (s, S1..S3} between the at least one sensor (4a..4c] and the first circuit breaker (3a..3f) maximum 100 mm and / or the shortest distance (S4) between the at least one sensor (4a..4c] and a screw connection (7) in the first path is a maximum of 100 mm.
7. switchgear assembly (la..lf) according to one of claims 1 to 5, characterized in that the current carrying capacity for the first and second path is equal.
8. switchgear assembly (la..lf) according to claim 7, characterized in that a rated current of a first circuit located in the first circuit breaker (3a..3f) is equal to a rated current of a lying in the second path second circuit breaker (3a..3f ).
9. A method of operating a cabinet, which
 an input (E) to connect the cabinet to a
Includes power supply network, at least one output (A], which supplies one of them
connected device with electrical energy,
 a plurality of electrical conductors (2, L1..L3, N) and a plurality of protective switches (3a..3f) arranged in the course thereof, with which the input (E) can be electrically connected to the at least one output (A) via a first path, and
 at least one arranged on one of the electrical conductors (2, L1..L3, N] sensor (4a..4c], which for the detection of a measured value for a through the
Conductor (2, L1..L3, N] and / or a measured value for a temperature of the conductor (2, L1..L3, N] is set up,
characterized in that
 the at least one output (A) within the cabinet is connected to the input (E) by actuation of the circuit breakers (3a..3f) via a second path deviating from the first path when the detected current is above a first one
Threshold is and / or the detected temperature is above a second threshold.
10. The method according to claim 9, characterized in that for the change from the first path to the second path lying in the first path first
Circuit breaker (3a..3f) is switched off and a second circuit breaker (3a..3f) located in the second path is switched on.
11. The method according to claim 9 or 10, characterized in that the voltage applied to the output (A] for the first and second path is the same.
12. The method according to any one of claims 9 to 11, characterized in that the phase position of the voltage applied to a terminal of the output (A] voltage for the first path and the second path is different.
13. The method according to any one of claims 9 to 11, characterized in that the relative phase position between the terminals of the output (A] adjacent
Voltages for the first path and the second path is the same.
14. The method according to any one of claims 9 to 13, characterized in that the at least one output (A] within the cabinet by actuation of the circuit breaker (3a..3f) via a second, deviating from the first path with the input path (E ] is connected when the temperature rises excessively at substantially the same current.
15. Circuit breaker (3a..3f) comprising
 a housing,
 at least one switching contact arranged in the housing,
 an overcurrent release and / or overtemperature release coupled to the at least one switching contact,
marked by
a arranged in the housing of the circuit breaker (3a..3f) or at its electrical terminals sensor (4a..4c], which for detecting a current flowing through the switching contact and / or for detecting a temperature of
Circuit breaker (3a..3f) is formed.
EP16711623.5A 2015-03-31 2016-03-23 Switchgear cabinet arrangement with improved cut-off in the event of an overload Pending EP3278349A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102015104920 2015-03-31
PCT/EP2016/056319 WO2016156131A2 (en) 2015-03-31 2016-03-23 Switchgear cabinet arrangement with improved cut-off in the event of an overload

Publications (1)

Publication Number Publication Date
EP3278349A2 true EP3278349A2 (en) 2018-02-07

Family

ID=55589867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16711623.5A Pending EP3278349A2 (en) 2015-03-31 2016-03-23 Switchgear cabinet arrangement with improved cut-off in the event of an overload

Country Status (2)

Country Link
EP (1) EP3278349A2 (en)
WO (1) WO2016156131A2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018103319U1 (en) * 2018-06-13 2019-09-16 Wago Verwaltungsgesellschaft Mbh Sensor device for a terminal block assembly, terminal block assembly, terminal block, control cabinet and read-out device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1592106A1 (en) * 2004-04-29 2005-11-02 Human Bios GmbH Device for connecting an electric load to a power source
DE102006011127B4 (en) * 2006-03-08 2011-04-21 Rittal Gmbh & Co. Kg Control cabinet arrangement with a control cabinet monitoring device
KR101079900B1 (en) * 2007-10-31 2011-11-04 주식회사 케이티 Static transfer switch device, power supply apparatus using the switch device and switching method thereof
US7973253B2 (en) * 2008-12-10 2011-07-05 Eaton Corporation Neutral draw-out automatic transfer switch assembly and associated method
JP2011253744A (en) * 2010-06-03 2011-12-15 Kawamura Electric Inc Circuit breaker capable of detecting poor contact
WO2013178259A1 (en) * 2012-05-30 2013-12-05 Siemens Aktiengesellschaft Overcurrent protection device
DE102012112435B4 (en) * 2012-12-17 2015-12-10 Phoenix Contact Gmbh & Co. Kg Automatic circuit breaker with auxiliary short-circuit and fuse arrangement with a plurality of such automatic circuit breakers
DE102014010034A1 (en) * 2013-07-18 2015-01-22 Abb Ag Arrangement with phase switching devices and a neutral switching device

Also Published As

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WO2016156131A3 (en) 2016-12-29

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