IEEE C 57.13-1 : 2006

Table of Contents

1 Overview
   1.1 Scope
   1.2 Purpose
2 Normative references
3 Definitions
4 Consideration of American National Standards Institute (ANSI)
   accuracy classes
5 Precautions in field testing CTs
   5.1 Demagnetizing CTs
   5.2 Greater primary winding turns
6 Types of tests and measurements
   6.1 Ratio test
   6.2 Polarity test
   6.3 Insulation resistance test
   6.4 Resistance measurement
   6.5 Excitation test
   6.6 Admittance test
   6.7 Burden test
7 AC sources for primary current injection tests
8 Ratio tests
   8.1 Voltage method
   8.2 Out-of-service current method
   8.3 In-service current manual method
   8.4 In-service current automated method
9 Polarity test
   9.1 DC voltage test
   9.2 AC voltage test-oscilloscope
   9.3 Current method
   9.4 Phase angle method
10 Insulation resistance tests
11 Winding and lead resistance (internal resistance)
12 Excitation test
13 Admittance test
14 Burden tests
15 Burden measurements
16 Specialized situations
   16.1 CT in a closed-delta transformer connection
   16.2 Generator CTs
   16.3 Inter-core coupling check
Annex A (informative) Wiring integrity, test switches and test
        equipment
      A.1 Wiring integrity
      A.2 Test switches
      A.3 Test equipment
Annex B (informative) Excitation voltage measurement considerations
      B.1 Why average?
      B.2 Typical test results
      B.3 Effect of source impedance
      B.4 Waveform simulation
Annex C (informative) Optical current sensor systems
      C.1 Components of optical current sensor systems
      C.2 Why optical sensor systems are used - characteristics
          and benefits
      C.3 Conventional transformers characteristics and issues
          that are not applicable in the field testing of
          optical current sensors
      C.4 Field testing of optical current sensor
      C.5 Maintenance/routine testing of optical sensor systems
Annex D (informative) Bibliography

Abstract

Specifies field test methods that assure current transformers (CTs) are connected properly, are of marked ratio and polarity, and are in a condition to perform as designed both initially and after being in service for a period of time.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN
Supersedes	IEEE DRAFT C57.13-1 : D8.0 2006