Electrical maintenance-1


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Electrical maintenance-1

  1. 1. Basics of Electrical Maintenance Part – I Technical & Non-Technical Mr. Vijay B. Raskar BE - Electrical / MBA – Operation / Autocad Engineer vijayraskar2003@yahoo.co.in
  2. 2. Story of New Plant Listen carefully – There are few questions at the end of the story.
  3. 3. Define Electrical Maintenance  Electrical Maintenance involves the fault diagnosis, routine servicing, and repair of electrical components of a machine.  An electrical maintenance Engineer is responsible for planning the maintenance to ensure the smooth running of production lines in a company.  The engineer service, repair and maintain the electrical components of a plant.
  4. 4. Electrical Maintenance Preventive Operational Corrective Q. Which one is the best for the Electrical Maintenance ? Q. Which one is dangerous for Organization point of view? R. Which one is mostly preferable? - Why a day reserved for Maintenance purpose ?
  5. 5. Preventive Maintenance The effectiveness of a preventive maintenance schedule depends on the RCM anylysis which it was based on, and the ground rules used for costeffectivity.  Preventive maintenance is maintenance performed in an attempt to avoid failures, unnecessary production loss and safety violations. Reliability Centered Maintenance (RCM) is a process to ensure that assets continue to do what their users require in their present operating context.
  6. 6. Electrical Preventive Maintenance What is the definition of Electrical Preventive Maintenance? The scheduled inspection, testing and maintenance of critical electrical components!
  7. 7. Electrical Preventive Maintenance Scheduled!!! 1) Start with a plan 2) Depending on the type of maintenance and the environment the frequency can vary from one to five years. 3) Be Proactive verses Reactive.
  8. 8. Electrical Preventive Maintenance Inspection, Testing & Maintenance 1) IEEE-- The Institute of Electrical and Electronic Engineers. 2) NETA --National Electrical Testing Association. 3) Good common sense.
  9. 9. Electrical Preventive Maintenance CRITICAL!!!! 1) No guarantees, reduce your probability of an electrical crisis or outage. 2) Does it cost you or your company money or is it just inconvenient. 3) Time period for evaluation, typically one hour. 4) How is the electrical distribution system designed.
  10. 10. Electrical Preventive Maintenance High Voltage verses Low Voltage Low Voltage- 120 to 600 volt equipment High Voltage - over 600 volt equipment
  11. 11. Electrical Preventive Maintenance High Voltage verses Low Voltage 1) Different types of testing, contact verses non-contact. 2) Energized cleaning tightening. 3) Critical verses Non-Critical 4) Typically different types of deficiencies.
  12. 12. Electrical Preventive Maintenance Typical Low Voltage Deficiencies 1) Overloading 2) Code violations 3) Loose connections 4) Trash, contamination or storage 5) Harmonics
  13. 13. Electrical Preventive Maintenance Typical High Voltage Deficiencies 1) Corona or tracking 2) Stress cone failure 3) Loose connections 4) Dirt or contamination
  14. 14. Electrical Preventive Maintenance Harmonics 1) Caused by the switching or disruption of the normal 60 cycle sine wave. 2) Tripling harmonics 3rd, 9th or 15th. 3) Motor rotation. 4) Annoying verses destructive harmonics.
  15. 15. Electrical Preventive Maintenance Infrared Analysis 1) Imaging verses scanning. 2) Measures infrared wave emissions not temperature. 3) Emissivity 4) Is not a cure-all, do not use a screwdriver when you need a hammer. 5) High voltage verses low voltage.
  16. 16. Electrical Preventive Maintenance Ultrasound Leak Detection 1) Microphone 2) High voltage 3) Pole leads 4) Steam traps 5) Motor bearings
  17. 17. Electrical Preventive Maintenance Transformer Oil Testing 1) Dissolved Gas Analysis 2) Oil Quality Profile 3) PCB Analysis 4) SD Meyers 5) Taking samples 6) Frequency
  18. 18. Electrical Preventive Maintenance Polarization Index Testing 1) Megger Test 2) Capacitance Test 3) Frequency
  19. 19. Electrical Operational Maintenance where equipment is maintained in using. Operational maintenance is the care and minor maintenance of equipment using procedures that do not require detailed technical knowledge of equipment’s or system’s function and design. This category of operational maintenance normally consists of inspecting, cleaning, servicing, preserving, lubricating, and adjusting, as required. Such maintenance may also include minor parts replacement that does not require the person performing the work to have highly technical skills or to perform internal alignment.
  20. 20. Electrical Operational Maintenance As the term implies, operational maintenance, is performed by the operator of the equipment. Its purpose is threefold: (1) To make the operator aware of the state of readiness of the equipment. (2) To reduce the delays that would occur if a qualified technician had to be called every time a simple adjustment were needed and (3) To release technicians for more complicated work  Depending on the type of equipment in use, operators may also be responsible for replacing worn out filters or cartridges, or removing and replacing a worn belt, cutting tool, or grinding stone. Operational maintenance may entail keeping machinery well lubricated to reduce the risk of friction or failure.
  21. 21. Electrical Corrective Maintenance where equipment is maintained after break down. This maintenance is often most expensive because worn equipment can damage other parts & cause multiple damages. Corrective maintenance is the program focused on the regular task that will maintain all the critical machinery and the system in optimum operating conditions. The major objectives of the program are to 1.Eliminating breakdown 2.Eliminating deviation 3.Eliminating unnecessary repairs 4.Optimize all the critical planned system
  22. 22. Maintenance Software Now – a – days number of software are used to control or maintain the electrical environment. There are many software's available in the market. Like CMMS, epix etc