Informasi Seminar

Electrical Transformer

Electrical Transformer

Yogyakarta | 30 April-03 May 2012 | IDR 7.000,000.00 per participant
Yogyakarta | 03-06 September 2012 | IDR 7.000,000.00 per participant


Electrical Transformer Basics discusses how units are used to reduce voltage for various day-to-day electrical applications. Electrical Transformers serve the crucial function of transforming voltage potential to a higher or lower values to meet the appliances and machinery voltage level requirements. Improper use, maintenance and neglect can cause heavy losses to businesses as well as to the environment. This electrical transformer training course introduces basic safe operational and field diagnostics of transformers with the focus on safe operation, testing and maintenance of the distribution transformers normally installed in substations and on poles.


Field and shop technicians, field engineers, supervisors and others responsible for the testing and maintenance of power transformers rated 750kVA to 500MVA and 4.16kV to 500kV.


1.    Transformers types

  •   Single and three phases
  • Power and distribution transformers
  • Voltage (VT) and current transformers (CT’s)
  • Auto-transformer
  • Phase shifting

2.    Voltage classes and applications and connections
3.    Load taps changers (LTC’s)

  • Resistance and Reactance types
  • Tap position indication
  • Ratings and selection criteria
  •  LTC with power factor correction capacitor

4.    Connections

  • Polarity and angular displacement
  • Y – Y, Δ – Δ , Y – Δ and Δ – Y connections
  •  Interconnected Y and grounding
  •  Phase shifting
  • 3phase to 6 phase connection

5.    Temperature monitoring and cooling methods and accessories
6.    Paralleling transformers
7.    Name plate rating – Volt Amp Vs Watt
8.    Transformer testing

  •  Classes and sequence
  • Turns ratio
  •  Polarity
  • Insulation and impulse
  •  Control devices

9.    Performance tests

  •   No load and excitation
  •  Load losses and impedance measurement
  •  Winding resistance and short circuit test
  •  Heat run test
  •  Winding resistance and impedance calculation

10.    Performance characteristics, loading, regulation and efficiency

  •  Transformer loading requirements

11.    Magnetizing, inrush and over excitation
12.    Transformers for drives and harmonics influence on performance

  • Secondary current distortion due to semiconductor devices loading
  •   Total harmonic distortion
  • Reactors and Filters

13.    Transformer de-rating and what K-ratings means
14.    Installation, Testing and Maintenance

  • Standards for Transformers
  • Installation & Relocation
  • Transformer Type Tests
  • Transformer Routine Tests
  • Transformer Commissioning Tests
  • Transformer Maintenance: Concepts of preventive & condition based maintenance
  • Case studies
  • Discussion

15.    Installation and safety operation

  • Connections and Vector groups
  •  Safe procedures relating to transformer operation in a utility or industry environment
  • Thermal performance and Loading of Transformers
  •  Practical solutions for operating and maintaining power transformers
  •  Voltage Adjustment using Off-Load & On-Load Tap Changing
  • Earthing of HV Transformers

16.    Transformer failure statistics

  • Transformer failure modes
  • Lightening
  • Internal Faults
  • External Faults
  •  Insulation Damage
  • Component Failures
  • Transformer failure statistics
  • How to categorize transformer failure modes

17.    Protection methods

  • Oil temperature Alarm and Trip
  •  Winding temperature Alarm and Trip
  • Buchholz relay, Oil Surge relay & Pressure relief relay
  •  Surge protection
  • Fuse protection
  • Protective relaying ?V Overcurrent, Earth fault, Differential & Overflux

18.    Online monitoring

  • Oil Quality Analysis
  • Dissolved Gas Analysis
  •  Furan Compound Analysis
  •  Partial Discharge Monitoring ?V Acoustic & Electrical
  • Interpretation of test results

19.     General diagnostic and assessment test

  •  Insulation Resistance and Polarization Index
  •  Turns Ratio and Excitation Current
  •  Capacitance and Power Factor
  • Winding Resistance
  • Recovery Voltage Measurement
  •  Frequency Response Analysis
  •   Interpretation of test results

20.    Tap changers inspection and test

  •  Tap Changer Types ?V Off circuit & Load
  •  Off circuit Tap Changer Maintenance & Repairs
  • Load Tap Changer (LTC) Failure modes
  • LTC Oil Analysis
  • LTC Temperature Analysis
  • LTC Vibration Acoustic Signature Analysis
  • LTC Motor Current Signature Analysis
  • LTC Maintenance & Repairs

9.    Transformer accessories testing

  • Power factor tests of bushings
  • Insulation & other Electrical Tests of HVCTs
  • Periodic inspection and testing of Neutral Earthing Resistor
  •  Analysis of testing data
  • Routine inspection of cooling fans and pumps, breather & gauges

10.    Remaining life assessment

  •  Degree of Polymerization (DP) testing
  •  Relationship between DP and Furan concentration
  • Remaining Life Assessment Models based on operational history, dissolved gas and furan concentrations


  • Discuss
  • Case Study
  • Evaluation
  • Simulation


Teguh Santoso, Ir
Teguh Santoso experienced more than 26 years in Electrical.


  • Yogyakarta
  • 30 April-03 May 2012
  • 03-06 September 2012
  • 4 days – 08 am – 04 pm


IDR 7.000,000.00 per participant non residential


  • Module / Handout
  • Certificate
  • Souvenir
  • Training Kit


Posted in: Electrical, Yogyakarta

Post a Comment