Capacitor assembly, high-voltage direct-current transmission

Patent metadata

Field	Value
Publication number	US-10204738-B2
Application number	US-201515755799-A
Country	US
Kind code	B2
Filing date	Aug 28, 2015
Priority date	Aug 28, 2015
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A capacitor assembly has series-connected capacitor element groups, each with a plurality of capacitor elements connected in parallel. The capacitor elements are divided into a first sub-set and a second sub-set. The capacitor elements of the first sub-set have a fuse while those of the second sub-set do not have a fuse. Extended operation is achieved even in the event of individual malfunctioning capacitor elements by using capacitor elements with fuses to separate the corresponding capacitor element in the event of a failure without generating a substantial change in the capacitance of the entire capacitor assembly. In order to prevent an avalanche effect in which the entire capacitor element group is separated, a sub-set of the capacitor elements do not have a fuse, so that a capacitor element is always provided which generates a bridge of the respective capacitor element group in the event of a failure.

First claim

The invention claimed is:

1. A capacitor assembly, comprising:
a plurality of capacitor-element groups connected in series;
each of said capacitor-element groups including a plurality of capacitor elements connected in parallel;
said capacitor elements of at least one of said capacitor-element groups including a first subset of capacitor elements and a second subset of capacitor elements; and
said capacitor elements of said first subset having a fuse and said capacitor elements of said second subset not having a fuse.

2. The capacitor assembly according to claim 1 , wherein said capacitor elements of said first subset with the fuse are configured so that the capacitor elements become non-conducting following an overload event.

3. The capacitor assembly according to claim 1 , wherein said capacitor elements of said second subset without a fuse are configured so that the capacitor elements become conducting following an overload event.

4. The capacitor assembly according to claim 1 , wherein said at least one of said capacitor-element groups consists of said first subset of capacitor elements and said second subset of capacitor elements.

5. The capacitor assembly according to claim 1 , wherein said capacitor elements of each of said capacitor-element groups include a first subset of capacitor elements and a second subset of capacitor elements, and wherein said capacitor elements of the respective said first subset include a fuse, while said capacitor elements of the respective said second subset do not have a fuse.

6. The capacitor assembly according to claim 5 , wherein said first subset of capacitor elements of a given capacitor-element group is larger than said second subset of capacitor elements of the given capacitor-element group.

7. The capacitor assembly according to claim 5 , wherein said capacitor elements of the respective said second subset are configured for a higher voltage load and/or current load than said capacitor elements of the respective said first subset.

8. The capacitor assembly according to claim 5 , wherein all of said capacitor-element groups are identical.

9. The capacitor assembly according to claim 1 , wherein said first subset of capacitor elements is larger than said second subset of capacitor elements.

10. The capacitor assembly according to claim 1 , wherein said capacitor elements of said second subset are configured for a higher voltage load and/or current load than said capacitor elements of said first subset.

11. The capacitor assembly according to claim 1 , wherein all of said capacitor-element groups are identical.

12. A capacitor bank, comprising a plurality of capacitor assemblies according to claim 1 .

13. The capacitor bank according to claim 12 , configured for a rated voltage of more than 1 kV.

Assignees

• Siemens Ag

Inventors

• Wietzel Stephan

Classifications

• H01G11/10

  Multiple hybrid or EDL capacitors, e.g. arrays or modules (housings, cases, encapsulations or mountings thereof H01G11/78) · CPC title

• H01G4/38

  Multiple capacitors, i.e. structural combinations of fixed capacitors · CPC title

• H01G2/16 Primary

  with fusing elements · CPC title

• H01G11/16

  against electric overloads, e.g. including fuses · CPC title

• H01G4/40

  Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations · CPC title