MEDIUM-VOLTAGE SWITCHGEAR ASSEMBLY HAVING A SHORT-CIRCUITING UNIT

Abstract

A voltage switchgear assembly is disclosed, which includes a short-circuiting unit having short-circuiting devices arranged as a three-phase unit. A support is configured to receive the short-circuiting unit and is configured to be inserted into and withdrawn from an openable section of a switchgear assembly housing.

Description

FIELD

The disclosure relates to a voltage switchgear assembly or medium-voltage switchgear assembly having a short-circuiting unit.

BACKGROUND INFORMATION

Arc faults in medium-voltage switchgear assemblies are generally to be extinguished as quickly as possible. Protection devices for this purpose can have an arc-fault duration of 200 to 300 milliseconds, which is extinguished by actuation of a feed circuit breaker. However, for long arc-fault durations, the switchgear assembly can be damaged. Fast-acting protection relays reduce the arc-fault duration to 50 to 100 milliseconds using current limiters. However, this is still too long.

SUMMARY

A voltage switchgear assembly is disclosed, comprising: a short-circuiting unit, which includes short-circuiting devices arranged as a three-phase unit; and a support, which is configured to receive the short-circuiting unit and is configured to be inserted into and withdrawn from an openable section of a switchgear assembly housing.

A voltage switchgear assembly is disclosed, comprising: a short-circuiting unit, which includes pyrotechnic switches arranged as a three-phase unit; and a support, which is configured to receive the short-circuiting unit and is configured to be inserted into and withdrawn from an openable section of a switchgear assembly housing.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure is explained below with reference to the exemplary embodiments shown in the drawings. In the drawings:

FIG. 1 shows an exemplary short-circuit module with a housing;

FIG. 2 shows the same as FIG. 1, with the housing;

FIG. 3 shows an exemplary switchgear assembly;

FIG. 4 shows an exemplary switchgear assembly; and

FIG. 5 shows an open state of an exemplary medium-voltage switchgear assembly.

DETAILED DESCRIPTION

The disclosure provides a medium-voltage switchgear assembly, wherein the functionality of a fast-acting short-circuiting device can be relatively easily implemented and/or easily retrofitted.

According to the disclosure, short-circuiting devices are arranged as a three-phase unit on a support, which can be inserted into and withdrawn from an openable section of a switchgear assembly housing movably by means such as an insertion/withdrawal platform.

One exemplary embodiment includes a short-circuiting unit being provided with insertion tulips which correspond to fixed contact points within the switchgear assembly housing, and which make contact upon insertion of the short-circuiting unit into the housing.

A further exemplary embodiment includes a short-circuiting unit being provided as an at least partially encased structural unit which can be retrofitted into a switchgear assembly, or retrofitted without the insertion platform at or on a switchgear assembly. As a result of this, direct connection to the busbar can be made, for example, by means such as a roof mounting.

In an exemplary embodiment, the short-circuiting devices can be pyrotechnic switches. The switching of the pyrotechnic switches is driven by a pyrotechnic priming charge, which can achieve extremely short switching times. As a result of this and through the use of fast-acting sensor electronics, switching times, for example, of a maximum of 4 milliseconds can be obtained. Thus, arc faults can be extinguished as soon as they occur.

A further exemplary embodiment includes an electronics unit, which controls the short-circuiting unit and is retrofittable as a module unit. In accordance with an embodiment, the electronics unit can contain the tripping electronics for the short-circuiting unit.

Another exemplary embodiment provides that the electronics unit has at least two signal inputs for light detection and at least three signal inputs for current or residual-current detection. The corresponding sensors can be arranged distributed within the switchgear assembly. For example, using the corresponding sensor, one can determine precisely the location of the fault. In addition, a test mode for self-checking of the system can be implemented.

In accordance with another exemplary embodiment, the short-circuiting device be arranged as a three-phase unit on a support which can be inserted into and pushed out of a cutout, which can be opened, in a switchgear assembly housing in a moving manner, via an insertion/withdrawal platform.

FIG. 1 shows a short-circuiting device 1 according to an exemplary embodiment, which is implemented as a three-phase device and is arranged as a unit on a support 3. In an embodiment, this support 3 in turn integrally comprises an insertion and withdrawal platform which corresponds to the openable section of the switchgear assembly or the switchgear assembly housing 4, as shown in FIG. 5. The contacts, which project upwards, then correspond, in the insertion process, to the insertion tulips of the known type, with the result that an electrical connection of the contact-insertion tulip arrangement 10 is made in the insertion end position.

FIG. 2 shows the illustration from FIG. 1 without the housing. In contrast, FIG. 1 shows a view through said at least partially closed housing, resulting in an encased short-circuit module. For example, such a module can also be fitted externally to the switchgear assembly.

In contrast, FIG. 2 shows the open design which can then, for example, be implemented in the switchgear assembly or the switchgear assembly housing 4.

FIG. 3 shows a side view into the switchgear assembly housing 4 with the openable section 5, and the short-circuit module inserted into the operational position. FIG. 4 shows another side view of the switchgear assembly housing 4 in more detail.

FIG. 5 shows the opened state of the housing of the medium-voltage switchgear assembly and the partially inserted short-circuiting unit. The movable platform 6 can be inserted and withdrawn in the manner of a sliding tray, wherein, inside the housing of the switchgear assembly, during insertion the contact-making connection of the contacts via the insertion tulips is closed, and during withdrawal this connection is opened again.

The aforementioned electronics for controlling the short-circuiting unit can be incorporated in the control part of the switchgear assembly, or a separate section in which the switchgear assembly is placed can be provided in the switchgear assembly housing. The aforementioned optical sensors are placed inside the switchgear assembly housing in a position where they can detect the arc.

It will be appreciated by those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The presently disclosed embodiments are therefore considered in all respects to be illustrative and not restricted. The scope of the invention is indicated by the appended claims rather than the foregoing description and all changes that come within the meaning and range and equivalence thereof are intended to be embraced therein.

Claims

1. A voltage switchgear assembly, comprising: a short-circuiting unit, which includes short-circuiting devices arranged as a three-phase unit; anda support, which is configured to receive the short-circuiting unit and is configured to be inserted into and withdrawn from an openable section of a switchgear assembly housing.

2. The switchgear assembly as claimed in claim 1, comprising: a platform, which is configured to receive the support and is inserted into and withdrawn from the openable section of the switchgear assembly housing.

3. The switchgear assembly as claimed in claim 1, wherein the short-circuiting devices are provided with insertion tulips which correspond to fixed contact points within the switchgear assembly housing and are configured to make contact upon insertion of the three-phase unit into the switchgear assembly housing.

4. The switchgear assembly as claimed in claim 1, wherein the short-circuiting unit is provided as an at least partially encased structural unit, which is configured to be implemented into a switchgear assembly.

5. The switchgear assembly as claimed in claim 1, wherein the short-circuiting unit is provided as an at least partially encased structural unit, which is configured to be implemented on a switchgear assembly without a platform.

6. The switchgear assembly as claimed in claim 1, wherein the short-circuiting devices are pyrotechnic switches.

7. The switchgear assembly as claimed in claim 1, comprising: an electronics unit, which is configured to control the short-circuiting unit and is retrofittable as a module unit.

8. The switchgear assembly as claimed in claim 7, wherein the electronics unit has at least two signal inputs for light detection and at least three signal inputs for current or residual-current detection.

9. The switchgear assembly as claimed in claim 1, comprising: optical sensors, which are configured to be placed inside the switchgear assembly housing to detect an arc.

10. A voltage switchgear assembly, comprising: a short-circuiting unit, which includes pyrotechnic switches arranged as a three-phase unit; anda support, which is configured to receive the short-circuiting unit and is configured to be inserted into and withdrawn from an openable section of a switchgear assembly housing.

11. The switchgear assembly as claimed in claim 10, comprising: a platform, which is configured to receive the support and is inserted into and withdrawn from the openable section of the switchgear assembly housing.

12. The switchgear assembly as claimed in claim 10, wherein the pyrotechnic switches are provided with insertion tulips which correspond to fixed contact points within the switchgear assembly housing and are configured to make contact upon insertion of the three-phase unit into the switchgear assembly housing.

13. The switchgear assembly as claimed in claim 11, wherein the short-circuiting unit is provided as an at least partially encased structural unit, which is configured to be implemented into a switchgear assembly.

14. The switchgear assembly as claimed in claim 11, wherein the short-circuiting unit is provided as an at least partially encased structural unit, which is configured to be implemented on a switchgear assembly without a platform.

15. The switchgear assembly as claimed in claim 11, comprising: an electronics unit, which is configured to control the short-circuiting unit and is retrofittable as a module unit.

16. The switchgear assembly as claimed in claim 15, wherein the electronics unit has at least two signal inputs for light detection and at least three signal inputs for current or residual-current detection.

17. The switchgear assembly as claimed in claim 11, comprising: optical sensors, which are configured to be placed inside the switchgear assembly housing to detect an arc.

18. The switchgear assembly as claimed in claim 11, wherein switching of the pyrotechnic switches is driven by a pyrotechnic priming charge.