7023 Compensated Current Transformer

  • Operating Voltage up to 300 kV Line to Neutral
  • Partial Discharge < pC @ rated voltage
  • Rated Current up to 4000 A
  • Wide Measurement Range
  • Negligible Current Division Errors
  • Burden Compensation

The model 7023/4000 series of High-Voltage Current Transformers was designed for the current input to MI’s 300 kV Loss Measurement System. This design meets the requirements of both IEC and IEEE standards for testing power transformers. C57. The bushings are filled with insulating gas and fitted with a pressure indicator or with an optional pressure transducer with a 4-20 mA output for continuous monitoring. Connections to the primary window winding of the current transformer are made via a copper bar rated to handle high current up to 4000 A.

Features & Benefits
Feature Benefit
Operating Voltage up to 300 kV and 4000 A The wide operating range for voltage and current gives test facilities the flexibility for testing all sizes of power transformers and shunt reactors 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.
Operating Current Rating

(at 50/60 Hz)

4000 A
Operating Voltage (max)

(Line to Neutral @ 50/60Hz)

300 kV
Withstand Voltage

(Line to Neutral @ 50/60Hz)

330 kV
Partial Discharge < 10 pC @ 300 kV
CT Nominal Ratio 2000:1
Ratio Error

(for magnitude and phase shift)

≤ 20 ppm
Temperature Range


 -5 °C to 40 °C
Relative Humidity Range


Up to 95 %, non-condensing
Operating Environment Indoor Use Only
Overall Height: mm (in) 3280 (129.1)

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