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Voltage Transformer Testing


Testing Procedures

  • Insulation Resistance test.
  • Voltage Transformer Ratio & Polarity test.
  • Winding Resistance test.
Download: VT Test Format

Equipment Required

  1. CPC 100 for VT Ratio & Polarity test.
  2. Insulation Resistance tester: Megger mit1020. 
  3. Multimeter.
  4. Micro ohm meter: Drlo10
Picture
CPC 100
Picture
Insulation Tester
Picture
Multimeter
Picture
Micro ohm Meter

Insulation Resistance Test

  • Use Megger mit1020 to measure insulation resistance.
  • Insulation Resistance Tests to be done:
    • Primary winding - Ground      (Apply 1kV for 1 minute)
    • Primary winding - Secondary winding      (Apply 500V for 1 minute)
    • Secondary winding - Secondary winding      (Apply 500V for 1 minute)
    • Secondary - Ground      (Apply 500V for 1 minute)

VT Ratio & Polarity Test

  • Use Omicron CPC100 to test VT ratio & polarity.
  • ​Connection on CPC100 will be same as the shown figure.
  • Repeat the test for the other phases and the other secondary cores.
Picture

Winding Resistance Test

  • Use multimeter to measure the primary winding resistance (Normally in k ohm).
  • Use the micro ohm meter to measure the secondary winding resistance ( Normally in m ohm).

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  • Home
    • Site Map
    • About Substations
  • Formats
    • Auxiliary Relays
    • Equipments Formats
    • Protection Formats >
      • Energization Tests
    • Functional Test Format
  • Manuals
  • Software
  • Support
    • Testing & Commissioning
    • Test Procedures
    • Relays Calculations
    • Relays Configuration
    • Tutorials
    • References
    • Label Design
  • Blog
  • About Me