Methods and apparatus for rendering electrical cables safe
A “safe grounding apparatus” (SGA) for safely grounding or neutralizing the electrical conductors for permanent magnet motor (PMM) powered artificial lift systems and methods of practicing the same are disclosed. The SGA of the present invention ameliorates some of the dangers associated with PMM's. Methods of shorting, grounding, testing and monitoring the electrical conductors of a permanent magnet motor in order to safely manipulate the conductors are also disclosed.
1. A safe grounding apparatus comprising:
a connector assembly comprising:
a plurality of ferrules disposed within the connector assembly;
a first end of a plurality of conductors electrically coupled to the plurality of ferrules;
the plurality of conductors each comprise an insulated conductor having a solid conductor core having an outside diameter and an insulating jacket surrounding the core;
the plurality of ferrules each comprise a hollow cylinder having an inner diameter larger than the outside diameter of the solid conducting core;
a second end of the plurality of conductors adapted to be electrically coupled to a motor lead end (MLE); and
the plurality of ferrules adapted to electrically couple to at least one shorting conductor.
2. The safe grounding apparatus of claim 1 , further comprising a grounding pin coupled to the connector assembly.
3. The safe grounding apparatus of claim 1 , wherein the at least one shorting conductor comprises a plurality of shorting conductors adapted to electrically couple the MLE to a suitable ground.
4. The safe grounding apparatus of claim 3 , wherein the MLE is disposed on a reel and wherein the connector assembly is adapted to be mounted to the reel.
5. The safe grounding apparatus of claim 4 , wherein the MLE is further electrically coupled to a permanent magnet motor and wherein the plurality of shorting conductors is further adapted to electrically couple to a monitoring device.
6. The safe grounding apparatus of claim 5 , wherein the monitoring device is adapted to monitor at least one electrical condition of the permanent magnet motor.
7. A safe grounding apparatus for mounting to a reel comprising: a connector assembly comprising:
a plurality of ferrules;
a plurality of conductors each comprising an insulated conductor having a solid conductor core having an outside diameter and an insulating jacket surrounding the core;
the plurality of ferrules each comprise a hollow cylinder having an inner diameter larger than the outside diameter of the solid conducting core;
a first end of the plurality of conductors electrically coupled to the plurality of ferrules;
a second end of the plurality of conductors adapted to be electrically coupled to a lead end (MLE);
the plurality of ferrules adapted to electrically couple to at least one shorting conductor; and
wherein the connector assembly is mounted to the reel.
8. The safe grounding apparatus of claim 7 , further comprising a grounding pin coupled to the connector assembly.
9. The safe grounding apparatus of claim 7 , wherein the at least one shorting conductor comprises a plurality of shorting conductors adapted to electrically couple the MLE to a suitable ground.
10. The safe grounding apparatus of claim 9 , wherein the MLE is disposed on the reel.
11. The safe grounding apparatus of claim 10 , wherein the MLE is further electrically coupled to a permanent magnet motor and wherein the plurality of shorting conductors is further adapted to electrically couple to a monitoring device.
12. The safe grounding apparatus of claim 11 , wherein the monitoring device is adapted to monitor at least one electrical condition of the permanent magnet motor.
13. A method of safely installing a permanent magnet motor comprising:
providing an MLE motor a lead end (MLE) disposed on a reel;
electrically coupling the MLE to the permanent magnet motor;
mounting a connector assembly to the reel, the connector assembly comprising: a plurality of ferrules;
and
a first end of a plurality of conductors electrically coupled to the plurality of ferrules;
the plurality of conductors each comprise an insulated conductor having a solid conductor core having an outside diameter and an insulating jacket surrounding the core;
the plurality of ferrules each comprise a hollow cylinder having an inner diameter larger than the outside diameter of the solid conducting core;
electrically coupling a second end of the plurality of conductors to the MLE; and
electrically coupling the plurality of ferrules to at least one shorting conductor.
14. The method of claim 13 , wherein the at least one shorting conductor comprises a plurality of shorting conductors, the method further comprising electrically coupling the MLE to a suitable ground.
15. The method of claim 14 , further comprising electrically coupling at least one of the plurality of shorting conductors to a monitoring device.
16. The method of claim 15 , further comprising:
mechanically coupling the permanent magnet motor to a pump; and
installing the permanent magnet motor and the pump in a borehole.
17. The method of claim 16 , further comprising monitoring at least one electrical condition of the permanent magnet motor while installing the permanent magnet motor and the pump in a borehole.