Transformer Maintenance
This course is intended to provide participants with a basic background in transformer theory and connection schemes as well as an overview of the most common transformer types and the typical maintenance and testing procedures that apply to them.
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Learning Objectives
By the end of the this course you will be able to:
- List the essential parts of a simple transformer.
- State how a transformer fulfills the three requirements for electromagnetic induction.
- State the relationship between primary and secondary voltages and transformer turns ratio.
- State the relationship between primary and secondary currents and transformer turns ratio.
- Define the following terms:
- Regulation
- Copper losses
- Iron losses
- Eddy currents
- Hysteresis
- Demonstrate how a transformer1s turns ratio can be altered by selecting various combinations of primary and secondary taps.
- Define the following terms:
- Additive polarity
- Subtractive polarity
- List the requirements that must be satisfied when transformers are connected in parallel banks.
- List the advantages and disadvantages of autotransformers as compared to two-winding transformers.
- List four common connection schemes for three-phase transformers.
- Define distribution transformer.
- List the basic safety precautions necessary before performing maintenance on a dry-type transformer.
- Using data from a transformer nameplate, indicate the required tap connections to maintain the rated output voltage for a given supply voltage.
- List the sequence of test connections for performing a ratio test on a three-phase transformer.
- List the necessary preparations and the connection sequence for performing an insulation resistance test on a three-phase transformer.
- Define wet-type transformer.
- Compare and contrast the safety considerations involved with the use of mineral oil and PCB’s as the insulating liquid in wet-type transformers.
- List three tests commonly performed on wet-type distribution transformers.
- List the basic steps in the high-potential insulation test procedure.
- List the basic steps in the two-voltmeter ratio test procedure.
- List the basic steps in the core-loss test procedure.
- Define power transformer.
- List four typical types of transformer cooling systems and the basic components of each type.
- Describe four typical methods for sealing power transformers.
- List the typical· in-service inspection points for a forced-air/forced-oil gas seal type power transformer.
- List the typical tests and checks performed on power transformers that are de-energized and cleared for maintenance.
- State the function of a load tap changer.
- Define the following terms:
- Potential transformer
- Current transformer
- Draw a schematic of a potential transformer showing its primary connections.
- Draw a schematic of a current transformer showing its primary connections.
- Describe the safety precautions required when disconnecting the secondary of a current transformer.
Specs
| Course Level | Intermediate |
| Languages | English |
| Compatibility | Audio, Video, MobileReady |
Course Applies To
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