Power Transformer Maintenance And Acceptance Testing
Power Transformer Maintenance And Acceptance Testing (on photo: Austin Energy’s Substation Maintenance Power Transformer hot oil processing and vacuum filling; credit:

Theory and operation

This manual contains a generalized overview of the fundamentals of transformer theory and operation. The transformer is one of the most reliable pieces of electrical distribution equipment (see figure l-l). It has no moving parts, requires minimal maintenance, and is capable of withstanding overloads, surges, faults, and physical abuse that may damage or destroy other items in the circuit.

Often, the electrical event that burns up a motor, opens a circuit breaker, or blows a fuse has a subtle effect on the transformer.

Although the transformer may continue to operate as before, repeat occurrences of such damaging electrical events, or lack of even minimal maintenance can greatly accelerate the even failure of the transformer. The fact that a transformer continues to operate satisfactorily in spite of neglect and abuse is a testament to its durability. However, this durability is no excuse for not providing the proper care.

Most of the effects of aging, faults, or abuse can be detected and corrected by a comprehensive maintenance, inspection, and testing program.


Substation transformers can range from the size of a garbage can to the size of a small house; they can be equipped with a wide array of gauges, bushings, and other types of auxiliary equipment.

The basic operating concepts, however, are common to all transformers.

An understanding of these basic concepts, along with the application of common sense maintenance practices that apply to other technical fields, will provide the basis for a comprehensive program of inspections, maintenance, and testing.

These activities will increase the transformers’s service lie and help to make the transformer’s operation both safe and trouble-free.

Title:Power Transformer Maintenance And Acceptance Testing
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Power Transformer Maintenance And Acceptance Testing
Power Transformer Maintenance And Acceptance Testing

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Page edited by E.C. (Google).


  1. ejaz
    Aug 07, 2015

    could not download

  2. Vinod Maurya
    Aug 18, 2014

    I want to know about transformer neutral ground related. if transformer neutral is not grounded. that time we connected one bulb transformer phase with ground . that time bulb will glow or not.

  3. siavash533
    Oct 09, 2013

    the link is dead please upload it again.

    • Edvard
      Oct 09, 2013

      I just checked the link and it works. Maybe had some hickup in the moment you tried to download guide. Please try again, it should work now.

    Jun 11, 2013


  5. Lamin
    Jan 07, 2012

    Avery simple detels but it is helpfull.

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