Main transformers Flashcards
What are the components through which current flows as the voltage from the generator is stepped up to transmission levels?
Windings
What are the insulated bars or wires called that are used to connect the main transformer to other components in the electrical system?
Bushings
What device will isolate the main transformer is the core short circuits?
Sudden pressure relay
What type of gas is used in a main transformer’s gas blanketing system?
Nitrogen
What action should be taken if a nitrogen leak is indicated during a routine inspection?
The leak must be located and repaired
What are the insulated bars or wires called that are used to connect the main transformer to other components in the electrical system?
Bushings
Most main transformers have ___that are automatically activated if the normal cooling banks are NOT cooling the transformer properly.
Auxiliary cooling banks
What are the components through which the current flows as the voltage from the generator is stepped up to transmission levels?
Windings
What device will isolate the main transformer if the core short circuits?
Sudden pressure relay
The nitrogen blanketing system can be tested for leaks by shutting off the nitrogen tank supply valve and observing gas pressure in the ___.
Transformer casing drops over a period of time.
What action should be taken if a nitrogen leak is indicated during a routine inspection?
The leak must be located and repaired
What can the presence of acetylene, hydrogen or methane in the cooling oil indicate?
The transformer is degrading or has experienced a fault
The nitrogen pressure in the transformer shell should be ___.
Slightly higher than ambient pressure
What type of gas is used in a main transformer’s gas blanketing system?
Nitrogen
A transformer’s ___ relay will compare the power delivered from the generator to the power leaving the transformer.
Differential
