Oil well casting electrical power pick-off points
First Claim
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1. A power supply apparatus comprising:
- an external power transfer device configured for disposition around a first piping structure, the external power transfer device configured to receive a first AC current from the first piping structure;
an internal power transfer device configured for disposition within the first piping structure in proximity to the external power transfer device;
a second piping structure configured for disposal within the first piping structure and carrying the internal power transfer device such that the internal power transfer device is axially aligned with the external power transfer device;
wherein the internal power transfer device is operable to produce a second current induced when the first AC current is supplied to the external power transfer device.
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Abstract
A power supply apparatus is provided for supplying power and communications within a first piping structure. An external power transfer device is positioned around the first piping structure and is magnetically coupled to an internal power transfer device. The internal power transfer device is positioned around a second piping structure disposed within the first piping structure. A main surface current flowing on the first piping structure induces a first surface current within the external power transfer device. The first surface current causes a second surface current to be induced within the internal power transfer device.
285 Citations
16 Claims
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1. A power supply apparatus comprising:
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an external power transfer device configured for disposition around a first piping structure, the external power transfer device configured to receive a first AC current from the first piping structure; an internal power transfer device configured for disposition within the first piping structure in proximity to the external power transfer device; a second piping structure configured for disposal within the first piping structure and carrying the internal power transfer device such that the internal power transfer device is axially aligned with the external power transfer device; wherein the internal power transfer device is operable to produce a second current induced when the first AC current is supplied to the external power transfer device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of producing a remote AC signal within a first piping structure comprising:
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providing an external power transfer device configured for disposition around the first piping structure; providing an internal power transfer device configured for disposition within the first piping structure; coupling a main AC signal to the first piping structure; inducing a first AC signal within the external power transfer device using an inductive coupling between the first piping structure and the external power transfer device; inducing a remote AC signal within the internal power transfer device using an inductive coupling between the external power transfer device and the internal power transfer device; wherein the step of providing an external power transfer device further comprises the steps of; positioning a toroidal transformer coil around the first piping structure; positioning a primary solenoid transformer coil around the first piping structure; electrically connecting the toroidal transformer coil to the primary solenoid transformer coil; and positioning a secondary solenoid transformer coil around a second piping structure disposed within the first piping structure, the secondary solenoid transformer coil being axially aligned with the external power transfer device. - View Dependent Claims (13, 14, 15, 16)
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Specification