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HT Motors and Protection Methods for Future

Introduction

HT Motors and Protection Methods for Future.

Course Objective

This course is designed to enable participants to:

• Understand AC motor operation and construction.
• Overview different types of motor duties.
• Read & explain the motor NP data.
• Motor de-rating factors.
• Specify, select and install motors.
• Specify speed control requirements for motors.
• Interpret motor performance curves
• Electrical motors in Hazardous area.
• Install and commission motors
• Fix faults on motors.
• Specify protection requirements for HV motors.

Course Outline

Review of Fundamentals/Basics

• Resistors, Ohm’s Law, Capacitors, dielectrics, magnetic field, Ampere's law, Faraday's law, inductance, and alternating currents.

Introduction to Different Types of Electric Motors

• DC motors.
• AC motors (1-Ph & 3-Ph).
• Induction Motors.
• Synchronous motors.
• International Codes and Standards.

Fundamentals of Motor Technology

• Basic construction and physical configuration, windings.
• Principles of operation and performance.
• How the motor produces torque.
• Theory of operation.
• Basic principles of rotating electric machines.
• Fundamental principles of speed control.
• Efficiency, torque, inertia, horsepower/power factor.
• Torque-speed curves.
• Motor Losses & Efficiency.
• Induction motor design.
• Duty cycles.
• Insulation and Cooling requirements.
• Selecting motors.
• Classified Ex motors.
• De-rating Factors (Temperature, altitude, …).
• Voltage unbalance.
• Power Factor Improvement.

Condition Monitoring And Diagnostics

• Partial Discharge
• Insulation Resistance Monitoring
• Correction for Winding Temperature
• Insulation Contamination
• IR Test Connections
• Typical IR Testing Program
• DC HI-POT TEST
• Maximum Allowable Test Voltage
• Measuring Insulation Degradation
• Capacitive Charging Current
• Resistive Leakage Current
• Insulation Power Factor
• Insulation Power Factor Standards
• Power Factor Test Sets
• Outage for Scheduled Maintenance
• On Line Measuring Partial Discharge Activity (PDA) For Insulation
• Motor Current Signature Analysis (MCSA)

Maintenance of HT Induction Motors

• Maintenance Requirements
• Cleaning Motors
• Care of Stator Windings
• Care of Rotor Winding
• Motor Shaft Currents
• Inspecting Motor Bearings.
• Different Electrical Testing.
• Electrical Preventive Maintenance Work Instructions.
• Troubleshooting Electric Motors.
• Motor Failures
• Insulation failure
• Over-current/overloading
• Cable box failure
• Rotor burnout
• Bearings
• Vibration
• Induction Motors Troubleshooting Guide
• Motors and Electrical safety

HT Motor Protection

• Introduction
• Motor characteristics involved in protection
• General motor protection
• Phase Fault Protection
• Differential Protection
• Ground-Fault Protection
• Thermal And Locked-Rotor Protection
• Locked-Rotor Protection For Large Motors (21)
• System Unbalance And Motors
• Unbalance And Phase Rotation Protection
• Under-voltage Protection
• Repetitive Starts And Jogging Protection
• Multifunction Microprocessor Motor Protection Units
• Practical Considerations Of Motor Protection
• Effect On System Of Starting A Large Motor

Repeated starting

Motor Starting Currents

• Achieving Short-Circuit Protection
• Motor Damage
• Motor Operation at Reduced Voltage
• De-rating due to unbalanced currents
• Determination of sequence currents
• Unbalanced supply voltages and single phasing.