Device and method for detecting insulation faults in an electrical hybridization system

Abstract

A device for detecting insulation faults in an aircraft hybrid system, the hybrid system comprising an electrical machine connected to a power converter configured to be powered by a voltage source, the device comprising: - a voltage divider connected between the two potentials of the power converter's supply bus, a midpoint of the voltage divider being configured to be connected to a general mechanical ground, and - a supervisor connected to the voltage divider and configured to compare voltage values ​​across the voltage divider with a reference voltage value for detecting insulation faults in the hybrid system. Figure for the abstract: Fig 1

Claims

The reference (REF) for detecting an insulation fault is equal to a sum of a tolerance margin (VT) and the voltage (VS) generated by the voltage source (3) divided by two.

7. A device for detecting an insulation fault according to any one of claims 1 to 6, wherein the voltage (VS) generated by the power supply (3) is between 500 and 1000 V and / or the resistance values ​​(RI, R2) are between 10 kOhm and 1 MOhm.

8. A method for detecting an insulation fault in an aircraft hybrid system being intended to be implemented by an insulation fault detection device according to any one of claims 1 to 7, the hybrid system comprising an electric machine (1) connected to a power converter (2), the method comprising the steps of: - supplying the power converter (2) with a voltage source (3) via two power buses (6, 7); - comparing, by a supervisor (12), the voltage values ​​(Vsl, Vs2) across a voltage divider (10) with a reference voltage value (REF) for detecting an insulation fault, the voltage divider (10) being connected between said two power buses (6, 7), the voltage divider comprising a midpoint (11) connected to a general mechanical ground.

9. Method for detecting an insulation fault according to claim 8, further comprising a step of determining whether an insulation fault is present in the hybridization system based on the comparison of voltage values ​​(Vsl, Vs2) and of emitting a warning signal if an insulation fault is present in the hybridization system.

10. Aircraft comprising a hybridization system including an insulation fault detection device according to any one of claims 1 to 7. [Fig. 1] [Fig. 2]

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