7021U Compensated Current Transformer

  • High Voltage Bushing
  • Operating Voltage 100 kV Line to Neutral
  • Partial Discharge < 10 pC @ rated voltage
  • Rated Current up to 4000 A
  • Wide Measurement Range
  • Negligible Current Division Errors
  • Burden Compensation
Features & Benefits
Feature Benefits
Operating Voltage up to 100 kV and 4000 A The wide operating range for voltage and current gives test facilities the flexibility for testing different sizes of power transformers with one setup.
Wide Measurement Range Provides continuous testing capability, no need for changing taps during the tests. The high accuracy is maintained in the entire range.
Burden Compensation Minimizes CT ratio errors to almost zero or negligible level. No need to compensate for leads length.
Partial Discharge < 10 pC Such low level ensures the test setup has no or negligible impact on any measurement or those where partial discharge is tested.
Specifications
7021U  7021U/2000 7021U/4000
Operating Current Rating

(at 50/60 Hz)

 2000 A 4000 A
Operating Voltage (max)

(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
Ratio Error

(for magnitude and phase shift)

 ≤ 20 ppm ≤ 20 ppm
Temperature Range

(Operating)

 – 5 °C to 40 °C – 5 °C to 40 °C
Relative Humidity Range

(Operating)

 5 % to 80 % RH

(non-condensing)

 5 % to 80 % RH

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

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