Water and contamination absorber for C02 insulated electrical apparatus for the generation, transmission, distribution and/or usage of electrical energy

Patent metadata

Field	Value
Publication number	US-10522981-B2
Application number	US-201615153260-A
Country	US
Kind code	B2
Filing date	May 12, 2016
Priority date	Nov 12, 2013
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

The present invention relates to an electrical apparatus for generation, transmission, distribution and/or usage of electrical energy, comprising a housing enclosing an electrical apparatus interior space, at least a portion of which forms at least one insulation space having an electrical component and containing a surrounding insulation medium comprising an amount of carbon dioxide m co2 . The insulation space is formed by at least one insulation space compartment, in which an adsorber for reducing or eliminating the amount of water m H2O and optionally further contaminants from the insulation medium is arranged. The amount of adsorber m ads arranged in the at least one insulation space compartment complies with the formulae (I) and (II).

m
ads

≥

m

H
2

⁢
O

k

ads
,

H
2

⁢
O

(
I
)

m
ads

≤

0.1
⁢

m

CO
2

k

ads
,

CO
2

(
II
)

First claim

The invention claimed is:

1. Electrical apparatus for the generation, transmission, distribution and/or usage of electrical energy, said electrical apparatus comprising
a housing enclosing an electrical apparatus interior space, at least a portion of the electrical apparatus interior space forming at least one insulation space, in which an electrical component is arranged and which contains an insulation medium surrounding the electrical component, the insulation medium comprising carbon dioxide,
the insulation space comprising at least one insulation space compartment, in which an adsorber for reducing or eliminating an amount of water and further contaminants from the insulation medium is arranged,
wherein an upper limit of an amount of the adsorber m ads complies with the following formula (II):

m
ads

≤

0.1
⁢

m

CO
2

k

ads
,

CO
2

(
II
)

with
m CO2 being the amount of carbon dioxide present in the respective insulation space compartment at the time when placing the adsorber into the insulation space compartment; and
k ads,CO2 being the adsorption capability of the adsorber towards carbon dioxide at the predetermined temperature T 0 at the time when placing the adsorber into the insulation space compartment, and
wherein the insulation medium additionally comprises an organofluorine compound, and a lower limit of the amount of adsorber m ads arranged in the at least one insulation space compartment, in particular in each insulation space compartment, complies with the following formula (Ii):

m
ads

≥

m

H
2

⁢
O

k

ads
,

H
2

⁢
O

+

∑

i
=
1

n

⁢

⁢

m

dp
i

k

ads
,

dp
i

(
Ii
)

with
m H2O being the amount of water present in the respective insulation space compartment at the time when placing the adsorber into the insulation space compartment,
k ads,H2O being the adsorption capability of the adsorber towards water at a predetermined temperature T 0 at the time when placing the adsorber into the insulation space compartment,
m dpi being the amount of a respective decomposition product dp 1 , dp 2 , . . . dp n created in and/or released into the respective insulation space compartment between gas maintenance or gas replacement intervals, with i being an index for the i-th decomposition product, and
k ads,dpi being the adsorption capability of the adsorber towards the respective i-th decomposition product dp 1 , dp 2 , . . . dp n at the predetermined temperature T 0 , and
at least one decomposition product is a decomposition product of the organofluorine compound.

2. Electrical apparatus according to claim 1 , wherein the adsorber is a molecular sieve.

3. Electrical apparatus according to claim 2 , wherein the molecular sieve is a zeolite.

4. Electrical apparatus according to claim 2 , wherein the molecular sieve has an average pore size from 2 Å to 13 Å.

5. Electrical apparatus according to claim 1 , wherein the insulation space is formed by at least two insulation space compartments separated from each other.

6. Electrical apparatus according to claim 5 , wherein the volume of the at least two compartments differ from each other by a factor of at least 1.5.

7. Electrical apparatus according to claim 1 , further comprising a desiccant selected from the group consisting of: calcium, calcium sulphate, in particular drierite, calcium carbonate, calcium hydride, calcium chloride, potassium carbonate, potassium hydroxide, copper(II) sulphate, calcium oxide, magnesium, magnesium oxide, magnesium sulphate, magnesium perchlorate, sodium, sodium sulphate, aluminium, lithium aluminium hydride, aluminium oxide, activated alumina, montmorrilonite, phosphorpentoxide, silica gel, a cellulose filter, and mixtures thereof.

8. Electrical apparatus according to claim 1 , wherein the insulation medium further comprises a background gas selected from the group consisting of: air, air component, oxygen (O 2 ), nitrogen (N 2 ), nitrogen oxide, and mixtures thereof.

9. Electrical apparatus according to claim 8 , wherein the insulation medium comprises the background gas consisting of a mixture of carbon dioxide and oxygen.

10. Electrical apparatus according to claim 9 , wherein the ratio of the amount of carbon dioxide to the amount of oxygen ranges

Assignees

• Abb Schweiz Ag

Inventors

• Tehlar Denis
• Mahdizadeh Navid
• Paul Thomas Alfred

Classifications

• H02B13/055 Primary

  Features relating to the gas · CPC title

• H01H2033/566

  Avoiding the use of SF6 · CPC title

• H01H33/22

  Selection of fluids for arc-extinguishing · CPC title

• H01B3/56 Primary

  gases · CPC title

• H02B1/26 Primary

  Casings; Parts thereof or accessories therefor · CPC title