Electrical Machines and Equipment
Electrical Machines and Equipment
Electrical Machines and Equipment
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<strong>Electrical</strong> Technology Department<strong>Electrical</strong> <strong>Machines</strong> & <strong>Equipment</strong>sDetailed Theoretical ContentsHours Contents Related Tasks1. Semiconductors used in electrical power circuits8 PN junction Silicon rectifier Application of power diode. Types of silicon controlled rectifier (SCR, GTO, triac,etc). Methods of firing SCR <strong>and</strong> its protection Power transistor, MOSFET, IGBT. Operation of power transistor <strong>and</strong> its protection.Basic knowledge62. Rectifier circuits Single-phase rectifier circuits with resistive load. Smoothing <strong>and</strong> filter circuits Three- phase rectifier circuits with resistive load. ApplicationsBasic knowledge863. Controlled rectifier circuits Single-phase controlled rectifier circuit with resistive <strong>and</strong>inductive load Effect of inductive load on commutation process in singlephasecontrolled rectifier circuits. Effect of changing the firing angle on the voltage Three-phase controlled rectifier circuits with resistive loads. Applications.4. DC Chopper circuits Principle of operation of DC chopper. Transistorized DC chopper.Basic knowledgeBasic knowledge- 52 -
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