7021U Compensated Current Transformer

  • High-voltage bushing
  • Operating voltage: 100 kV line to neutral
  • Partial discharge: < 10 pC @ rated voltage
  • Current: up to 4000 A
  • Wide measurement mange
  • Negligible current division errors
  • Burden compensation
Features & Benefits
Feature Benefits
Operating voltage up to 100 kV and 4000 A The wide voltage and current operating range gives test facilities the flexibility to test different sized power transformers with one setup.
Wide measurement range
  • Provides continuous testing capability
  • No changing taps during the tests
  • The high accuracy is maintained in the entire range
Burden compensation
  • Minimizes CT ratio errors to negligible levels
  • No lead length compensation
Partial discharge < 10 pC Low levels ensure the test setup has a negligible impact on any measurement, or where partial discharge is tested.
Specifications
7021U  7021U/2000 7021U/4000
Operating current rating

(at 50/60 Hz)

 2000 A 4000 A
Operating voltage (line to neutral @ 50/60 Hz) 100 kV 100 kV
Withstand voltage (line to neutral @ 50/60 Hz) 138 kV 138 kV
Partial discharge < 10 pC @ 100 kV < 10 pC @ 100 kV
CT nominal ratio 2000:1 2000:1
Magnitude and phase shift ratio error ≤ 20 ppm ≤ 20 ppm
Operating temperature range – 5 °C to 40 °C – 5 °C to 40 °C
Operating humidity range 5 % to 80 % RH

(non-condensing)

 5 % to 80 % RH

(non-condensing)
Operating environment Indoor Use Only Indoor Use Only
Height: mm (in) 1844 (72.6) 1844 (72.6)

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