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Electrical Maintenance

  • Electricians and maintenance area supervisors and technicians, operation and maintenance planners and schedulers, reliability technicians as well as plant inspectors.
  • To provide a better understanding of electric generators and motors, performances, operation and breakdowns.
  • To enhance knowledge of power grid on plant, including safety and potential hazards.
Learning Objectives
  • To know how the grid of a plant works and its structure.
  • To understand the roles of the different safety parts of the grid and the links between them.
  • To master electrical receptors including motor operating principles.
  • To detect the main malfunctions related to electrical motors, on-line monitoring.

The principle of electrical distribution 0.5 day
  • Purpose of electrical distribution, characteristics of the grid.
  • One line electric distribution diagram.
  • Main grid, auxiliary grid, safety grid.
  • Application to a typical grid: closer look on the online diagram.
Sub station equipment and working principle of switchgear 2 days
  • Purposes and uses of equipment, as well as its first level maintenance.
  • Transformers: purpose of transformer on a power grid; operating principle, single phase to tri phase; windings connection; constitution (main parts); protection.
  • Circuit breakers: operating principle, technologies, typical failures.
  • Cables, switchboards, equipment, relays, diesel generators, batteries, chargers and UPS.
  • Gas insulated substation: principle and technology.
Reliability and safety equipment 1 day
  • Main types of protections.
  • Earthing system choice LV&HV: advantages and drawbacks.
  • Selectivity of protections: mains techniques.
  • Protection relays.
  • Insulation monitoring.
  • Hazardous area (ATEX) equipment: standards and maintenance obligations.
  • Lock out rules of switchgear before and after maintenance interventions.
Induction and synchronous motors 1 day
  • Concept of operation, characteristics (intensity, efficiency, power factor and torque).
  • Field of use and typical uses of power and voltage range HV & LV.
  • Technology and hazardous area (ATEX).
  • Variable speed drive, type of drives; consequence for the grid.
  • Electric protection of motors, temperature gauge.
  • Synchronous motors: torque control, excitation, different technologies.
  • Induction motors: various types of starting according to the mechanical load, the power of the motor, and the capacity of the grid, constraints imposed by the grid; maximal numbers of launches.
  • Application: failures and maintenance.
Steam turbines generators 0.5 day
  • Brief mechanical presentation of the steam turbine generator.
  • Concept of operation of the electrical generator.
  • Technology of the generator.
  • Coupling of the generator and islanding mode.
  • Impact on the grid.
  • Application: maintenance and malfunction consequences.