Power distribution system incorporating ground fault interrupt protection

• US 8,988,837 B2
• Filed: 06/08/2012
• Issued: 03/24/2015
• Est. Priority Date: 06/08/2012
• Status: Active Grant

• Current Assignee: Hamilton Sundstrand Corporation (Rtx Corporation)
• Original Assignee: Hamilton Sundstrand Corporation (Rtx Corporation)
• Inventors: Wagner, Carl A., Ives, Kyle Stephen, Wavering, Jeffrey T.
• Primary Examiner(s): Kitov, Zeev V
• Application Number:
  US13/492,003
• Publication Number:
  US 20130329321A1
• Time in Patent Office: 1,019 Days
• Field of Search: 361/42, 361/47, 361/49
• US Class Current: 361/42
• CPC Class Codes: H02H 3/16 responsive to fault current to earth, frame or mass with balanced or differential arrangement H02H3/26 ; monitoring earth connection H02H5/105
• CPC Class Codes: H02H 3/165 for three-phase systems
• CPC Class Codes: H02H 3/32 involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
• CPC Class Codes: H02H 3/33 using summation current transformers H02H3/347 takes precedence
• CPC Class Codes: H02H 7/26 Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured locating faults in cables G01R31/08
• CPC Class Codes: H02H 9/08 Limitation or suppression of earth fault currents, e.g. Petersen coil

Abstract

A power distribution system includes multiple uniform power distribution modules and multiple uniform mating connectors. A portion of the mating connectors are connected to the power distribution modules directly and the remainder are connected to the power distribution modules via a ground fault interrupt adapter.

Claims

1. A power distribution system comprising:

a plurality of uniform power distribution modules, wherein each of said power distribution modules includes a module connector;

a plurality of uniform mating connectors operable to connect to said power distribution modules;

a plurality of ground fault interrupt adapters, each including

a first uniform connection operable to interface with the module connector of one of the plurality of uniform power distribution modules and a second uniform connection operable to interface with one of the plurality of uniform mating connectors, such that said ground fault interrupt adapter is operable to connect one of the plurality of uniform power distribution modules to one of the plurality of uniform mating connectors, and

a current sensor arrangement operable to determine a net current of at least one phase passing through the ground fault interrupt adapter and a neutral passing through the ground fault interrupt adapter; and

each of the module connectors including at least one net current input operable to receive a detected net current from a ground fault interrupt adapter when a ground fault interrupt adapter is connected to the module connector.

2. The power distribution system of claim 1, wherein said ground fault interrupt adapter includes at least one current sensor operable to sense a ground fault in a connection between said power distribution module and said mating connector.

3. The power distribution system of claim 2, wherein said current sensor is operable to detect a ground fault on a single sensed power phase.

4. The power distribution system of claim 2, wherein said current sensor is operable to detect a ground fault present in a sensed poly-phase power signal.

5. The power distribution system of claim 1, wherein each of said uniform power distribution modules includes at least one ground fault interrupt detection circuit.

6. The power distribution system of claim 5, wherein said at least one ground fault interrupt detection circuit is an integrated circuit.

7. The power distribution system of claim 5, wherein said determined net current from said ground fault interrupt adapter is communicated through a corresponding net current input to said ground fault interrupt detection circuit.

14. The power distribution system of claim 1, wherein each of said plurality of uniform mating connectors corresponds to a single load, and wherein each of said plurality of uniform mating connectors requiring ground fault interrupt protection is connected to a corresponding uniform power distribution module through a dedicated ground fault interrupt adapter.

8. A ground fault interrupt (GFI) adapter for a power distribution system comprising:

a first uniform connection operable to interface with a uniform module connector of a power distribution module and a second uniform connection operable to interface with a uniform mating connector;

a plurality of power phase pass throughs operable to pass electrical power from the power module connector to the mating connector through said ground fault interrupt adapter;

at least one current sensor operable to sense a net current passing through said ground fault interrupt adapter; and

at least one neutral connection operable to connect a neutral line within said ground fault interrupt adapter to a neutral line of the uniform mating connector.

9. The ground fault interrupt adapter of claim 8, wherein each of said at least one current sensors further comprise an output operable to connect each of said at least one current sensors to a ground fault interrupt detection circuit in a connected power distribution module.

10. The ground fault interrupt adapter of claim 8, wherein one of said at least one current sensor is a current transformer sensor.

11. The ground fault interrupt adapter of claim 10, wherein said current transformer sensor surrounds each phase of a balanced multiphase pass through and a neutral line, such that said current transformer sensor is operable to detect when said multiphase pass through is out of balance.

12. The ground fault interrupt adapter of claim 10, wherein said current transformer sensor surrounds a single phase pass through and a neutral, such that said current transformer sensor is operable to detect a current level passing through said single phase pass through.

15. The ground fault interrupt (GFI) adapter of claim 8, wherein the ground fault interrupt adapter is a dedicated ground fault interrupt adapter corresponding to a single load.

13. A method for providing ground fault interrupt protection in a power distribution system comprising:

connecting uniform mating connectors to uniform power distribution modules directly at connections not requiring ground fault interrupt protection; and

connecting uniform mating connectors to uniform power distribution modules via a ground fault interrupt adapter at connections requiring ground fault interrupt protection, wherein the ground fault interrupt adapter comprises

a first uniform connection operable to interface with a module connector of the uniform power distribution module and a second uniform connection operable to interface with the uniform mating connector, such that said ground fault interrupt adapter is operable to connect one of the plurality of uniform power distribution modules to one of the plurality of uniform mating connectors, and

a current sensor arrangement detecting a net current of at least one phase and a neutral passing through the ground fault interrupt adapter; and

communicating the detected net current from said ground fault interrupt adapter to said module connector of the uniform power distribution module;

determining the presence of a ground fault at said connection based on said detected net current using a ground fault detection circuit in said uniform power distribution modules.