An improved ac/dc current comparator

摘要

A novel design of the magnetic cores, windings and means of theexcitation and detection for an improved ac/dc current comparator isdisclosed. The system enables accurate measurements of ac current onlyor dc current only, or both simultaneous ac and dc current with a pairof detection cores and windings only. For the same order sensitivity ofac/dc current detection, the cost and weight of the improved ac/dccurrent comparator decrease by 30-percent, while the magnetic shieldingeffectiveness increases by 10-percent compared with the normal ac/dccurrent comparator for the 5000-A prototype