Method and arrangement for securing a current transformer to an electric utility meter housing

• US 6,008,711 A
• Filed: 01/09/1998
• Issued: 12/28/1999
• Est. Priority Date: 01/09/1998
• Status: Expired due to Term

• Current Assignee: Landis+Gyr AG (Landis+Gyr Group AG)
• Original Assignee: Siemens Power Transmission & Distribution Incorporated (Siemens AG)
• Inventors: Bolam, Charles
• Primary Examiner(s): Gellner, Michael L.
• Assistant Examiner(s): MAI, ANH T
• Application Number:
  US09/005,107
• Time in Patent Office: 718 Days
• Field of Search: 324/104, 324/156, 324/157, 324/142, 324/76, 324/11, 336/92, 336/65, 336/174, 336/175, 361/602, 361/603, 361/620, 361/623, 361/663, 439/332, 439/334, 439/725, 439/550, 439/574, 439/518
• US Class Current: 336/92
• CPC Class Codes: H01F 27/06 Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
• CPC Class Codes: H01F 38/30 Constructions

Abstract

An arrangement for securing a current transformer to an electric utility meter housing. The arrangement includes a utility meter base plate which forms a portion of the electric utility meter housing. The utility meter base plate includes (i) a first central axis and (ii) a transformer receptacle defined therein. The transformer receptacle has an opening and a first retention surface. The arrangement also has a current transformer assembly including (i) the current transformer and (ii) a wall member affixed to the current transformer. The wall member defines an annular channel having a second central axis, and the current transformer is positioned within the annular channel. The transformer assembly also includes a tab having a second retention surface. The tab extends from the wall member. The current transformer assembly is secured to the utility meter base plate, such that the first central axis is substantially parallel with the second central axis, when the tab is disposed within the transformer receptacle so that the first retention surface engages the second retention surface. An associated method of securing a current transformer to an electric utility meter is also disclosed.

Claims

1. An arrangement for securing a current transformer to an electric utility meter housing, comprising:

a utility meter base plate which forms a portion of said utility meter housing, wherein said utility meter base plate includes a transformer receptacle defined therein, said transformer receptacle having an opening and a first retention surface; and

a current transformer assembly including (i) said current transformer, (ii) a wall member affixed to said current transformer, and (iii) a tab having a second retention surface, said tab extending from said wall member, wherein said current transformer assembly is secured to said utility meter base plate when said tab is disposed within said transformer receptacle and said first retention surface engages said second retention surface.

2. The arrangement of claim 1, wherein:

said utility meter base plate includes a plurality of said transformer receptacles defined therein and each of said transformer receptacles has an opening and a first retention surface, and

said current transformer assembly includes a plurality of said tabs, wherein each of said tabs correspond to one of said transformer receptacles and has a second retention surface for engaging said first retention surface of said corresponding transformer receptacle.

3. The arrangement of claim 1, wherein said tab is integrally formed with said wall member of said current transformer assembly.

4. The arrangement of claim 1, wherein said wall member defines an annular channel and said current transformer is disposed within said annular channel.

5. The arrangement of claim 4, wherein:

said wall member further defines a center aperture for receiving a utility meter current coil therethrough such that said current transformer is disposed in a current sensing relationship with said utility meter current coil.

6. The arrangement of claim 5, wherein:

said utility meter base plate has a first central axis,

said annular channel has a second central axis, and

said first central axis is substantially parallel with said second central axis when said current transformer is secured to said utility meter base plate.

7. The arrangement of claim 1, wherein:

said transformer receptacle includes a cavity, said cavity has a side wall which defines said first retention surface, and

said tab has a detent formed thereon which defines said second retention surface.

8. The arrangement of claim 1, further comprising:

a connector housing extending from said wall member; and

a connector disposed within said connector housing and electrically connected to said current transformer.

9. The arrangement of claim 8, wherein said connector housing is integrally formed with said wall member.

10. An arrangement for securing a current transformer to an electric utility meter housing, comprising:

a utility meter base plate which forms a portion of said electric utility meter housing, wherein said utility meter base plate includes (i) a first central axis and (ii) a transformer receptacle defined therein, said transformer receptacle having an opening and a first retention surface;

a current transformer assembly including (i) said current transformer, (ii) a wall member affixed to said current transformer, wherein said wall member defines an annular channel having a second central axis, and said current transformer is positioned within said annular channel, and (iii) a tab having a second retention surface, said tab extending from said wall member, wherein said current transformer assembly is secured to said utility meter base plate, such that said first central axis is substantially parallel with said second central axis, when said tab is disposed within said transformer receptacle so that said first retention surface engages said second retention surface.

11. The arrangement of claim 10, wherein:

said utility meter base plate includes a plurality of transformer receptacles defined therein and each of said transformer receptacles has an opening and a first retention surface, and

said current transformer assembly includes a plurality of tabs, wherein each of said tabs correspond to one of said transformer receptacles and has a second retention surface for engaging said first retention surface of said corresponding transformer receptacle.

12. The arrangement of claim 10, wherein said tab is integrally formed with said wall member of said current transformer assembly.

13. The arrangement of claim 10, wherein:

said wall member further defines a center aperture for receiving a utility meter current coil therethrough such that said current transformer is disposed in a current sensing relationship with said utility meter current coil.

14. The arrangement of claim 10, wherein:

said transformer receptacle includes a cavity, said cavity has a side wall which defines said first retention surface, and

said tab has a detent formed thereon which defines said second retention surface.

15. The arrangement of claim 10, further comprising:

a connector housing extending from said wall member; and

a connector disposed within said connector housing and electrically coupled to said current transformer.

16. The arrangement of claim 15, wherein said connector housing is integrally formed with said wall member.

17. A method of securing a current transformer to an electric utility meter housing having a base plate, said base plate having a transformer receptacle defined therein, said transformer receptacle including an opening and a first retention surface, said current transformer disposed within a current transformer assembly that includes a wall member affixed to said current transformer and a tab extending from said wall member, said tab including a second retention surface, the method comprising:

positioning said current transformer assembly such that said tab is disposed proximate said opening;

effecting movement of said current transformer assembly such that said tab traverses said opening; and

causing elastic deformation of at least one of said tab and said transformer receptacle to facilitate traversal of said opening by said tab so as to position said tab in said transformer receptacle such that (i) said first retention surface engages said second retention surface and (ii) said current transformer assembly is secured to said utility meter base plate.