Electrical ground isolation and secondary failure reduction detection and isolation
First Claim
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1. A method for isolating AC electrical ground faults in an electrical system, said method comprising:
- (a) detecting a component causing said AC ground;
(b) verifying said component causing said AC ground is actually causing said ground; and
(c) isolating said component causing said ground.
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Abstract
A system for isolating electrical ground faults and secondary failures in an electrical system, the system comprising an AC ground isolation state machine for detecting and isolating an AC ground, a DC ground isolation state machine for detecting and isolating a DC ground, a component failure isolation state machine for detecting and isolating a change in a resistance, and a component failure early detection algorithm for determining a failure before using the state machines.
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Citations
52 Claims
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1. A method for isolating AC electrical ground faults in an electrical system, said method comprising:
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(a) detecting a component causing said AC ground;
(b) verifying said component causing said AC ground is actually causing said ground; and
(c) isolating said component causing said ground. - View Dependent Claims (2, 3, 4, 43)
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5. A method for isolating a DC electrical ground fault in an electrical system, said method comprising:
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(a) detecting a DC ground;
(b) isolating a suspected component;
(c) verifying said isolated component is causing said DC ground; and
(d) if said component is not verified as causing said DC ground, considering other sources causing said ground. - View Dependent Claims (6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 18, 19, 20, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 37, 38, 39, 40, 41, 42, 45, 46, 47, 49, 50, 51, 52)
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11. A method for isolating a DC electrical fault in an electrical system, said method comprising:
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(a) isolating a suspected component when a change in resistance is detected; and
(b) verifying said isolated component is causing said change in resistance.
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17. A method for detecting an early failure in a component in an electrical system, said method comprising:
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(a) providing a model of operational conditions;
(b) collecting actual operational conditions; and
(c) comparing said model of operational conditions with said actual operational conditions to determine when said failure occurs.
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21. A system for isolating AC electrical ground faults in an electrical system, said system comprising:
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(a) a plurality of components;
(b) a first state where said system waits until an AC ground is detected;
(c) a second state to isolate a component causing said AC ground;
(d) a third state to verify component causing said AC ground is actually causing said ground;
(e) a fourth state to isolate said component causing said ground; and
(f) a fifth state to enable said component after a specific period.
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27. A system for isolating DC electrical ground faults in an electrical system, said system comprising:
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(a) a plurality of components;
(b) a first state where said system waits until a DC ground is detected;
(c) a second state where said systems transitions when a DC ground is detected to isolate a suspected component;
(d) a third state to verify said suspected component isolated is causing said DC ground; and
(e) a fourth state to consider other sources if a suspected component is not identified as causing said DC ground.
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36. A system for isolating a change in resistance in an electrical system, said system comprising:
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(a) a plurality of components;
(b) a first state where said system waits until a change in resistance is detected;
(c) a second state where said systems transitions when a change in resistance is detected to isolate a suspected component; and
(d) a third state to verify said suspected component isolated is causing said change in resistance.
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44. A system for detecting an early failure in a component in an electrical system, said system comprising:
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(a) a model of operational conditions specific to said component;
(b) a collection of actual operational conditions from said component; and
(c) a processor to compare said model of operational conditions with said collection of actual operational conditions to determine when said failure occurs.
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48. A system for isolating electrical ground faults and secondary failures in a locomotive propulsion system, said system comprising:
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(a) an AC ground isolation state machine for isolating a traction motor or alternator when an AC ground is detected;
(b) a DC ground isolation state machine for isolating a grid box when a DC ground is detected;
(c) a dynamic braking grid failure isolation state machine for isolating a grid box when a change in resistance is detected; and
(d) a dynamic braking grid failure early detection algorithm for determining a failure before using said state machines.
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Specification