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1. (WO2018158602) APPARATUS AND METHOD FOR DETECTING CURRENT OVERLOAD AND LEAKAGE IN A TRANSPORT REFRIGERATION UNIT

Pub. No.:    WO/2018/158602    International Application No.:    PCT/IB2017/000289
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Wed Mar 01 00:59:59 CET 2017
IPC: H02H 3/08
G01R 31/26
Applicants: CARRIER CORPORATION
ZARRABI, Jamal
Inventors: ZARRABI, Jamal
Title: APPARATUS AND METHOD FOR DETECTING CURRENT OVERLOAD AND LEAKAGE IN A TRANSPORT REFRIGERATION UNIT
Abstract:
A system and method for detecting current overload and leakage in a transport refrigeration unit. The method comprises measuring, by a microcontroller of an active fault detection circuit, a line current for each of one or more phases supplying power to a load of a refrigerant vapor compression system of the transport refrigeration unit; measuring, by the microcontroller, a voltage received by the active fault detection circuit from a battery of the transport refrigeration unit and transmitted via a conductor of the active fault detection circuit to a microprocessor of the refrigerant vapor compression system; controlling, by the microcontroller, a switch along the conductor of the active fault detection circuit to control transmission of the voltage, via the conductor to the microprocessor, Controlling the switch comprises (i) closing the switch upon a determination that the voltage level is greater than or equal to an operational threshold voltage level, (ii) closing the switch upon a determination that the voltage level is less than the operational threshold voltage level, and (iii) opening the switch upon a determination that any of the one or more line currents exceeds a threshold. Other embodiments are described herein.