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Hotel Aston Tropicana / Hotel Papandayan Bandung |  17 – 20 Juli  2012 | Rp 8.500.000/peserta
Hotel Aston Tropicana / Hotel Papandayan Bandung | 31 Juli – 03 Agustus 2012 | Rp 8.500.000/peserta
Hotel Aston Tropicana / Hotel Papandayan Bandung |  11 – 14 September 2012 | Rp 8.500.000/peserta
Hotel Aston Tropicana / Hotel Papandayan Bandung | 25 – 28 September  2012 | Rp 8.500.000/peserta
Hotel Aston Tropicana / Hotel Papandayan Bandung | 09 – 12 Oktober 2012 | Rp 8.500.000/peserta
Hotel Aston Tropicana / Hotel Papandayan Bandung | 30 Oktober – 02 November  2012 | Rp 8.500.000/peserta
Hotel Aston Tropicana / Hotel Papandayan Bandung | 20 – 23 November 2012 | Rp 8.500.000/peserta
Hotel Aston Tropicana / Hotel Papandayan Bandung |  11 – 14 Desember  2012 | Rp 8.500.000/peserta
Hotel Aston Tropicana / Hotel Papandayan Bandung | 26 – 29 Desember 2012  | Rp 8.500.000/peserta


Electrical Transformer 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.

Students will learn Electrical Transformer Basics – safe and proper maintenance and testing procedures on power transformers. The course covers transformers used in commercial and industrial power distribution systems, including oil and dry-type units. Larger power transformers used in utility applications are also covered.


Upon completion of this course, the participant should be able to:

  1. Understand the basic operation of a transformer.
  2. Understand turns ratios and calculate terminal voltage and current.
  3. Understand terminal markings and various single phase and three phase wiring schemes. (WYE vs DELTA).
  4. Understand how to perform a polarity test on a potential transformer.
  5. Understand the electrical testing methods performed on transformers such as insulation resistance testing, excitation and power factor testing.
  6. Understand the various tests performed on insulating oil.


Part 1

Participants will be introduced to the different types of single and three phase transformers construction, various types of core material, windings layout, connection, tap changers, voltage classifications and transformer applications.

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, ? – ? , Y – ? and ? – Y connections
  • Interconnected Y and grounding
  • Phase shifting
  • 3phase to 6 phase connection

5. Temperature monitoring and cooling methods and accessories

6. Paralleling transformers

Part 2

This part introduce the fundamental theory behind the voltage and current transformation, winding resistance and impedance calculation, voltage regulation, losses and output efficiency estimation for both power and distribution transformers.

1. Name plate rating – Volt Amp Vs. Watt

2. Transformer testing

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

3. 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

4. Performance characteristics, loading, regulation and efficiency

  • Transformer loading requirements

Part 3

Issues such as the influence of saturation, harmonics and power electronic devices on the transformer performance will also be addressed. Day 1 will wrap up by showing how to select transformers for various types of measurement and power transformation including the de-rating ratio calculation.

1. Magnetizing, inrush and over excitation

2. Transformers for drives and harmonics influence on performance

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

3. Transformer de-rating and what K-ratings means

4. Standards and conclusions

Part 4

1. 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

2. 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
  • Earthling of HV Transformers

3. Transformer failure statistics

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

4. 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

5. Online monitoring

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

6. 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

7. 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

8. 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

9. Remaining life assessment

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


Prof. Dr. Ir. Hamzah Berahim, MT

(Praktisi ahli di bidang electrical)


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.


Multimedia, Group Discussion, Role Play, Case Study


  • Biaya pelatihan sebesar Rp 8.500.000/peserta Non residensial.
  • Khusus untuk pengiriman 3 peserta dari perusahaan yang sama, biaya pendaftaran sebesar Rp. 8.000.000



  • Meeting room hotel *****
  • Training kit
  • Breakfeast and luch
  • Exclusive souvenir
  • Sertitifikat
  • Special  dinner in the last day
  • Wisata Budaya dan Belanja



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