Maintenance and Troubleshooting of UPS Systems and Battery Power Supplies

THE WORKSHOP

Supplying reliable electric power for critical systems is an essential part of modern industrial installations. Uninterrupted DC emergency power supply systems are used in various installations ranging from power generating stations to consumer-end substations and various applications such as control power to emergency lighting and small but critical motive loads. AC uninterrupted supply equipment find wide use in critical applications such as control, instrumentation, computer and communication systems in industrial as well as other types of installations. Electrical engineers in any industry or other large facilities in diverse areas such as commercial buildings, transportation systems such as railways, airports etc. are bound to come across AC or DC uninterrupted power supply systems. A basic understanding of various options of UPS systems available, the principle of operation and of the main energy source in most of the modern UPS installations, viz., the battery, therefore assumes importance. This workshop will discuss these aspects in detail.

WHAT IS INCLUDED?

  • Receive a certificate of attendance in support of your continuing professional commitment
  • All workshops include the associated hardcopy technical manual
  • Printed workshophandouts
  • Lunch and refreshments
  • Interact and network with workshop attendees and experienced instructors
  • Practical, industry driven content to assist you in your continuing professional development (CPD)
  • Attendees automatically become IDC subscribers and receive exclusivedeals and technical content every month

WHO SHOULD ATTEND?

  • Building service designers
  • Consulting engineers
  • Control engineers
  • Data systems planners and managers
  • Electrical engineers
  • Electrical technicians
  • Instrumentation engineers
  • Instrumentation technicians
  • Maintenance engineers
  • Power system protection engineers
  • Project engineers

CONTENT SUMMARY

OVERVIEW

  • Power quality
  • Power quality improvement
  • Importance of continuity of electric power supply
  • Planning for reliability
  • UPS system options
  • Static UPS systems
  • Batteries
  • Charging and discharging performance
  • Selection and sizing of batteries
  • Maintenance and disposal of batteries

POWER QUALITY

  • Limits of electrical parameters
  • What is power quality?
  • Power quality indicators
  • Power quality problems-effects and mitigation

CONTINUITY OF POWER AND THE ROLE OF UPS

  • Needs of equipment
  • Understanding failures
  • Effect of power interruptions
  • Planning for reliability
  • Redundancy and automation
  • Rotary UPS systems
  • Advanced rotary UPS systems
  • Hybrid UPS systems

A REFRESHER ON SEMICONDUCTORS, RECTIFIERS AND INVERTERS

  • Principle of semiconductor devices
    • Junction diode
    • Transistors
    • Thyristor
    • MOSFET and IGBT
  • Rectifiers (converters)
  • Ripple and its control
  • Harmonics
  • Inverters
  • Planning for reliability

STATIC UPS SYSTEMS

  • General configuration
  • Types of static UPS systems
  • UPS metering, indications, alarms and protection
  • Power quality and UPS
  • UPS applications to computer loads
  • UPS configurations in computer installations
  • Rating of UPS systems for computer equipment
  • Redundant UPS configuratio
  • Grounding of UPS derived supplies

BASICS OF BATTERIES

  • Battery and its two basic types
  • Secondary cells-construction
  • Applications of secondary batteries
  • General features
  • Battery types and construction
  • Chemical reactions in batteries
  • Salient features of lead-acid battery
  • Salient features of nickel-cadmium battery
  • Main types of lead-acid batteries
  • Lead acid battery-manufacturing process

CHARGING AND DISCHARGING OF BATTERIES

  • The need for charging
  • Types of charging
    • Float charging
    • Boost charging
  • Completion of charging
  • Overcharging and undercharging
  • Discharging of batteries
  • Battery charging equipment
  • Nickel cadmium batteries

SELECTION AND SIZING OF BATTERIES

  • Applicable definitions
  • Selection of batteries-basic approach
  • Application information
  • Sizing procedure
  • Calculating the number of cells
  • Duty cycle
  • Computing the capacity of battery based on duty cycle
  • Alternative method of sizing
  • Correction factors
  • UPS battery sizing

INSTALLATION OF BATTERIES

  • Requirements for safety during installation and operation
  • Receipt and checking of batteries and accessories
  • Storage prior to installation
  • Pre-installation planning
  • Installation of battery racks
  • Handling and pre-installation checks
  • Mounting of cells on racks
  • Installing flame arrestors and labels
  • Making electrical connections
  • Checking the integrity of electrical connections
  • Making external electrical connections

BATTERY MAINTENANCE, BATTERY FAILURES AND DISPOSAL

  • Need for maintenance and monitoring
  • Major causes of battery failures
  • Sulphation and hydration
  • Failure modes
  • Periodic inspection and maintenance of stationary batteries
  • Periodic inspection and maintenance – UPS batteries
  • Capacity testing for assessing residual battery life
  • Test equipment for capacity/integrity testing
  • Documentation
  • Personnel safety during maintenance
  • Replacement of defective batteries
  • Monitoring of batteries for predicting failures
  • Conductance testing – getting the most from a battery
  • Plate polarisation measurements
  • Disposal and recycling of batteries

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