Unit 1 Electrical Safety and Insulating Material

7 lecture hours

• 1.1 Do’sand Don’ts Regarding Safety in Substation/ Power Station Operators. 1.2 Electrical Safety in Industry/Power Stations/ Substations at the Time of Operation/ Control/ Maintenance. 1.3 Factors Affecting Life of Insulating Materials
• Classifications of Insulating Materials as Per Indian Standards. 1.4 Measuring Insulation Resistance by Different Methods Such As I) Polarization
• Ii) Dielectric Absorption
• Iii) Megger. 1.5 Reconditioning of Insulation-Drying Out Procedures. 1.6 Insulating Oil - Properties of Insulating Oil, Causes of Deterioration of Oil

Unit 2 Installation and Maintenance of Electrical Equipment

• 2.1 Requirements of Foundation for Static and Rotating Electrical Machinery. 2.2 Concept of Levelling and Aligning- Procedure for Levelling and Aligning
• Alignment ff Direct Coupled Drive
• Effects ff Mis- Alignment. 2.3 Installation Procedure of Power Transformer as Per I.S. 2.4 Installation Procedure of Rotating Electrical Machine (Induction Motor and Alternators) as Per I.S. 2.5 Installation Procedure of Switchgear (Circuit Breaker
• Isolator and Control Panel) as Per I.S. 12 27% GUJARAT TECHNOLOGICAL UNIVERSITY Program Name: Diploma Engineering Level: Diploma Branch: Electrical Engineering Subject Code: DI04009031 Subject Name: Commissioning & Maintenance of Electrical Equipments w.e.f. 2025-26 http://syllabus.gtu.ac.in/ Page 3 of 8 2.6 Devices and Tools Required for Installation ofElectrical Equipment. 2.7 Concept of Maintenance
• Types of Maintenance
• Preventive and Breakdown Maintenance. 2.8 Preventive Maintenance-Procedure for Developing Maintenance Schedules for Electrical Machines. 2.9 Factors Affecting Preventive Maintenance Schedules. 2.10 Maintenance Schedules of Following as Per IS: Power Transformer
• Three Phase Induction Motor
• Circuit Breaker
• Solar and Wind Power Plants

Unit 3 Commissioning of Transformer

• 3.1 Importance of Commissioning of Transformer. 3.2 Difference Between Type Test
• Routine Test and Special Test. 3.3 Pre-Commissioning Checks- Significance
• Procedure and Standard Reference Values for Pre- Commissioning Tests: 3.3.1 Insulation Resistance Measurement [Control Wiring
• Cooling System Motor and Control Circuit
• Main Windings (Polarization Index)
• Tap Changer Motor and Control] 3.3.2 Transformer Oil Break Down Voltage Test (BDV) and Oil Filtering. 3.3.3 Polarity and Vector Group Test. 3.3.4 Ratio Test on All Taps. 3.3.5 Magnetizing Current Test. 3.3.6 Magnetic Balance Test
• (For 3 Phase Transformer). 3.3.7 Capacitance and Tan Delta Measurement of Winding and Bushing. 3.3.8 Short Circuit Impedance Test. 3.3.9 Contact Resistance Measurement. 3.3.10 Measurement of Windings Resistance for all Tapsof OLTC. 3.4 Final Commissioning Checks. 3.5 Procedure-Energization of Transformer. 3.6 Faults and Troubleshooting of Transformer and its Auxiliary 10 23% GUJARAT TECHNOLOGICAL UNIVERSITY Program Name: Diploma Engineering Level: Diploma Branch: Electrical Engineering Subject Code: DI04009031 Subject Name: Commissioning & Maintenance of Electrical Equipments w.e.f. 2025-26 http://syllabus.gtu.ac.in/ Page 4 of 8 Equipment

Unit 4 Commissioning of Rotating Machines(Synchronous

8 lecture hours

• Induction Motor
• DC Machine). 4.1 Pre-Commissioning InspectionChecks for Rotating Machines. 4.2 Pre-Start Tests on Rotating Machines- 4.2.1 Winding Resistance Measurement 4.2.2 Insulation Resistance Measurement of Windings 4.2.3 High Voltage Tests (Power Frequency) 4.2.4 Trial Start 4.2.5 No Load Test 4.2.6 Vibration Measurement 4.3 Faults and Troubleshooting of Rotating Machines (Synchronous Machine
• DC Machine)

Unit 5 Commissioning of Switchgear and Power Cable

• 5.1 Pre-Commissioning Checks of Switchgear 5.1.1 Visual Inspection (Nameplate
• Interlocks). 5.1.2 Insulation Resistance (IR) Measurement. 5.1.3 Contact Resistance Test of Circuit Breakers and Isolators. 5.1.4 CTs, PTs, And Protection Relay Connections Verification. 5.2 Functional Tests of Switchgear 5.2.1 Mechanical Operation Test. 5.2.2 Protection Relay and Control Circuit Testing. 5.2.3 Interlock Verification (Electrical & Mechanical). 5.2.4 SF₆ Gas / Vacuum Integrity Test. 5.3 On-Site Commissioning Tests of Switchgear 5.3.1 High-Voltage WithstandTest
• (As Per IS/IEC). 5.3.2 Partial Discharge Test (For GIS). 5.3.3 Breaker Timing Test 5.4 Pre-Commissioning Checks of Power Cable 5.4.1 Physical Inspection (Joints
• Bending Radius). 5.4.2 Conductor Resistance & Continuity Test. 5.4.3 Insulation Resistance Measurement (Megger Test). 5.5 Site Acceptance Tests of Power Cable 8 18% GUJARAT TECHNOLOGICAL UNIVERSITY Program Name: Diploma Engineering Level: Diploma Branch: Electrical Engineering Subject Code: DI04009031 Subject Name: Commissioning & Maintenance of Electrical Equipments w.e.f. 2025-26 http://syllabus.gtu.ac.in/ Page 5 of 8 5.5.1 High-Voltage Withstand Test. 5.5.2 Sheath Integrity Test. 5.5.3 Capacitance and Tan ⸹(Dissipation Factor) Measurement. 5.6 Post-commissioning 5.6.1 Load Test Under Service Conditions. 5.6.2 Temperature Monitoring During Initial Energization. 5.6.3 Documentation of Test Results. 5.7 Faults and Troubleshooting of Switchgear and Power Cable