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Current Transformers

COURSE NO: E03-037
Current Transformers
Course Highlights

This online engineering PDH course provides information on the current transformer application, requirements, selection process and particular requirements for different protection relays. The presented details address issues related to measurement error, protection and measurement cores, accuracy classes, core selection and necessary technical requirements that current transformers have to meet.


Current transformers are specific transformer types used for current measurement. The common engineering laws are also valid for the current transformers. The most important roles of current transformers are:

  • To transform currents, from a high value to a value that can be easily handled by protection relays and associated instruments;
  • To separate and insulate the metering circuit from the high voltage; and
  • To provide options for standardization of instruments and protection relays with rated currents.


This 3 PDH online course is intended for engineers with a desire to understand the fundamentals of current transformers. Upon successful completion engineers will be able to address various current transformer terms, specific classes, application purposes and overall core selection process.
Learning Objectives

This PE continuing education course is intended to provide you with the following specific knowledge and skills:

  • Understanding current transformer measurement error
  • Learning about metering and protection cores
  • Learning how to select current transformer cores
  • Understanding the current transformer technical requirements
  • Learning about current transformers specific requirements for different relay protection applications
Course Document
In this professional engineering CEU course, you need to review the document titled, “Current Transformers” by Velimir Lackovic, Char. Eng.
To view, print and study the course document, please click on the following link(s):
Current Transformers (1.3 MB)
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of twenty (20) questions to earn 3 PDH credits. The quiz will be based on this entire document.
The minimum passing score is 70%. There is no time limit on the quiz, and you can take it multiple times until you pass at no additional cost.
Certificate of Completion

Upon successful completion of the quiz, print your Certificate of Completion instantly. (Note: if you are paying by check or money order, you will be able to print it after we receive your payment.) For your convenience, we will also email it to you. Please note that you can log in to your account at any time to access and print your Certificate of Completion.

To buy the course and take the quiz, please click on: