UEEEL0025 - Test and connect transformers

For Melbourne campuses

Assessment tasks will be designed to reinforce & extend knowledge and skill competence within set & controlled parameters in accordance with each unit’s learning outcomes & performance criteria requirements, incl the setting of work based practical application tasks designed to provide evidence of competence outcomes, within periodic and scheduled timelines.
Students will be expected to demonstrate the following required skills:
*applying work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures, including:

• identifying and assessing hazards and risks, and implementing control measures
• applying safe working procedures when connecting and testing transformers
• checking circuits are isolated in accordance with workplace procedures and regulatory requirements
  *solving problems with transformers, including:
• determining the operating parameters of an existing transformer
• altering an existing transformer circuit to comply with specified operating parameters
• developing transformer circuits to comply with a specified function and operating parameters
• determining the cause of low efficiency in an existing transformer
• determining conditions causing an existing circuit to be unsafe
  *determine polarity markings for an unidentified single phase double wound transformer
  *determining the value of a transformers secondary voltage and current from nameplate data when solving problems in transformer operations
  *determining voltage and current in the windings of an auto-transformer by calculation
  *selecting transformers for specific application
  *testing serviceability of transformers
  *applying sustainable energy principles and practices
  *completing problem-solving activities documentation.

Students will also be expected to demonstrate the following knowledge:
*AS/NZS 3000 Electrical installations requirements and restrictions on the installation and use of transformers
*methods used to insulate low voltage (LV) and high voltage (HV) transformers
*types of information stated on transformer nameplates
*types of lamination style and core construction used in transformers
*relevant industry standards relating to transformers
*application of transformers
*transmission and distribution transformers
*construction of voltage transformers
*ratings of voltage transformers
*auto-transformers and instrument transformers, including:

• advantages and disadvantages of an auto-transformer
• risks and safety control measures associated with connection and disconnection of instrument transformers
• connection diagrams for instrument transformers
• applications for auto-transformers and instrument transformers
• construction of current transformers
• ratings of current transformers
  *transformer operation, including:
• principles of mutual induction of a transformer
• factors that determine the induced voltage in a transformer winding
• determining the value of a transformers secondary voltage and current given one winding’s electrical details and turns ratio
• identification of voltage and current components of a phasor diagram for a transformer on no-load
• principles of power transferred from the primary to secondary when a load is connected using a phasor diagram neglecting impedance drops
• safety features specified in relevant industry standards with respect to transformers and isolating transformers
• determining circuit operating characteristics when solving problems in LV transformers
  *transformer losses, efficiency and cooling, including:
• methods used for natural and forced cooling of transformers
• power losses which occur in a transformer
• tests which allow the power losses of a transformer to be determined
• relationship between transformer cooling and rating
  *transformer voltage regulation including:
• reasons for voltage variation in the output of a transformer
• voltage regulation as applicable to a transformer
  *percentage impedance, including:
• as applied to transformers
• techniques for determining percentage impedance of a transformer by relevant calculation
  *parallel operation of transformers, including:
• need for parallel operation of transformers
• techniques for connecting in parallel to supply a single load (loading on transformers operating in parallel)
• conditions/restrictions required before two transformers can be connected in parallel
• the consequences/effect of an incorrect connection
  *relevant manufacturer specifications.