An Electronic Protection Unit for Diesel Engine StandbyudGenerators

摘要

Today diesel engine-driven standby generators for backup power supply have been adopted for residential,udcommercial, and industrial use--especially in some developing countries where power from the utility companyudis highly erratic. Although many of these generators function well in operation, certain engine conditions, such asudlow oil pressure, high oil and water temperature, abnormally high speed, etc., could lead to malfunction, failure,udor complete breakdown of the engine. Therefore, the focus of this work is to present the implementation of audsimple, but effective electronic protection unit (EPU) capable of mitigating the adverse effect which may arise asuda result of these conditions. It is composed of two major sub-circuits-the main protective sub-circuit and theudtiming sub-circuit-realized using a combination of passive and active components. Unlike the commonudelectrical relay-based protection system, this unit has an additional advantage of being able to keep the faultindicatingudsystem of the generator working even after engine shutdown, thereby facilitating fault tracking. Theudunit has been tested on a diesel engine-driven generator and found to function satisfactorily. The test results areudshown.