Method and apparatus for gas leak detection

1 . A method for detecting a gas leak of a gas tank of a Gas Insulated Electrical Device, comprising:

estimating at least one inside temperature for the gas tank based on a plurality of outside temperatures that are collected outside of the gas tank, the at least one inside temperature being estimated for at least one inside position within the gas tank during an operation of the Gas Insulated Electrical Device;

obtaining a gas pressure within the gas tank under a standard temperature based on the at least one inside temperature; and

detecting the gas leak of the gas tank based on the gas pressure,

wherein the plurality of outside temperatures comprise a first outside temperature and a second outside temperature, the first outside temperature being collected at a first outside position near an outside surface of the gas tank, and the second outside temperature being collected at a second outside position on the outside surface,

wherein the at least one inside temperature includes a first inside temperature, which indicates a temperature for a first inside position on an inside surface of the gas tank, and the first inside temperature is estimated by:

determining an outside heat flux between the first outside position and the second outside position based on the first and second outside temperatures;

determining a surface heat flux, that is associated with the first inside temperature, between the second outside position and the first inside outside position; and

calculating the first inside temperature based on the outside heat flux and the surface heat flux.

2 . The method of claim 1 , wherein:

the outside heat flux is determined by Ø outside =F(A, h 1 , t f1 , t w1 ), the surface heat flux is determined by Ø surface =G(A, λ, δ, t w2 , t w1 ), and the first inside temperature is calculated by t w2 =H(h 1 , t f1 , t w1 , λ, δ), wherein A represents an area of a wall of the gas tank, t f1 represents the first outside temperature, t w1 represents the second outside temperature, t w2 represents the first inside temperature, h 1 represents a coefficient of heat transfer related to t f1 and t w1 , λ represents a coefficient of heat transfer related to t w1 and t w2 , δ represents a thickness of the wall, and F, G and H represent respective mathematical functions.

3 . The method of claim 1 , wherein the at least one inside temperature further includes a second inside temperature, which indicates a temperature for a second inside position near the inside surface, and the second inside temperature is determined by:

determining an inside heat flux between the first inside position and the second inside position; and

calculating the second inside temperature based on the surface heat flux and the inside heat flux.

4 . The method of claim 3 , wherein:

the inside heat flux is determining by Ø inside =I(A, h 2 , t w2 , t f2 ), and the second inside temperature is calculated by t f2 =S(h 1 , h 2 , λ, δ, t f1 , t w1 ), wherein t f2 represents the second inside temperature, t f1 represents the first outside temperature, t w1 represents the second outside temperature, t w2 represents the first inside temperature, A represents an area of a wall of the gas tank, h 1 represents a coefficient of heat transfer related to t f1 and t w1 , λ represents a coefficient of heat transfer related to t w1 and t w2 , δ represents a thickness of the wall, h 2 represents a coefficient of heat transfer related to t w2 and t f2 , and I and S represent respective mathematical functions.

5 . The method of claim 1 , wherein detecting the gas leak comprises detecting the gas leak in response to any of:

a determination that the gas pressure is below a threshold pressure; and

a determination that a change associated with the gas pressure is above a threshold change.

6 . The method of claim 1 , wherein the first and second positions are selected based on a planar surface of the gas tank that is larger than another outside surface of the gas tank.

7 . The method of claim 1 , further comprises: updating the inside temperature based on a current strength of Gas Insulated Electrical Device, the current strength being received from a controller of the Gas Insulated Electrical Device.

8 . An apparatus for detecting a gas leak of a gas tank of a Gas Insulated Electrical Device, comprising:

a determining unit, being configured for determining at least one inside temperature for the gas tank based on a plurality of outside temperatures that are collected outside of the gas tank, the at least one inside temperature being estimated for at least one inside position within the gas tank during an operation of the Gas Insulated Electrical Device;

an obtaining unit, being configured for obtaining a gas pressure within the gas tank under a standard temperature based on the at least one inside temperature; and

a detecting unit, being configured for detecting the gas leak of the gas tank based on the gas pressure,

wherein the plurality of outside temperatures comprise a first outside temperature and a second outside temperature, the first outside temperature being collected at a first outside position near an outside surface of the gas tank, and the second outside temperature being collected at a second outside position on the outside surface,

wherein the at least one inside temperature includes a first inside temperature, which indicates a temperature for a first inside position on an inside surface of the gas tank, and the determining unit is further configured for:

determining an outside heat flux between the first outside position and the second outside position based on the first and second outside temperatures;

determining a surface heat flux, that is associated with the first inside temperature, between the second outside position and the first inside outside position; and

calculating the first inside temperature based on the outside heat flux and the surface heat flux.

9 . The apparatus of claim 8 , wherein the at least one inside temperature further includes a second inside temperature, which indicates a temperature for a second inside position near the inside surface, and the determining unit is further configured for:

determining an inside heat flux between the first inside position and the second inside position; and

calculating the second inside temperature based on the surface heat flux and the inside heat flux.

10 . A system for detecting a gas leak of a gas tank, comprising: a computer processor coupled to a computer-readable memory unit, the memory unit comprising instructions that when executed by the computer processor implements the method according to claim 1 .

11 . A computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, cause the at least one processor to perform the method according to claim 1 .

12 . A computer product having instructions stored thereon, the instructions, when executed on at least one processor, cause the at least one processor to perform the method according to claim 1 .

13 . The system of claim 10 , wherein the plurality of outside temperatures comprise a first outside temperature and a second outside temperature, the first outside temperature being collected at a first outside position near an outside surface of the gas tank, and the second outside temperature being collected at a second outside position on the outside surface.

14 . The computer readable medium of claim 11 , wherein the plurality of outside temperatures comprise a first outside temperature and a second outside temperature, the first outside temperature being collected at a first outside position near an outside surface of the gas tank, and the second outside temperature being collected at a second outside position on the outside surface.

15 . The computer product of claim 12 , wherein the plurality of outside temperatures comprise a first outside temperature and a second outside temperature, the first outside temperature being collected at a first outside position near an outside surface of the gas tank, and the second outside temperature being collected at a second outside position on the outside surface.