Ground fault protection for electrothermal de-icing applications

Details Ground fault protection for electrothermal de-icing applications Ground fault protection for electrothermal de-icing applications

1993-06-30

1994-11-01

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 46, H02H 902

Patent

active

053611837

ABSTRACT:
An electrical circuit that provides ground fault protection by compensating for the capacitive leakage current between an electrothermal de-icing system bonded to an aircraft surface. A conductive shield is interposed between the resistive heater element of the de-icing system and the grounded aircraft surface to control the path of the capacitive leakage current. The leakage current is directed to a primary coil of the GFI transformer where it is summed with the heater element return current. The resultant is compared with the heater element load current. If the load current equals the summation of the leakage current and the return current, the circuit remains operational; if the load current exceeds the summation of the leakage current and the return current by a threshold limit, the load current is interrupted.

REFERENCES:
patent: 3800121 (1974-03-01), Dean et al.

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