The Model 7021U series of High Voltage Current Transformers was designed for the current input to MI?s LMS 4000/100 or LMS 2000/100 Loss Measurement Systems. Forvoltages above 100 kV see the Model 7022U. This design meets the requirements of both CEI/IEC 44-1 and IEEE STD C57.12.00-2000. The bushing is filled to approximately 150 kPa of SF6 and is fitted with a pressure indicator or with an optional pressure transducer with a 4-20 mA output for continuous monitoring. Connections to the primary winding of the current transformer are made via a copper bar, machined at both ends. Utilizing passive two stage compensated technology, errors of less than 10ppm can be achieved at high voltages.
