Speaker
Description
Due to the feasibility of analytic solution, abundant researches have been conducted to study the measurement of line current by magnetic sensor array with circular arrangement. Since the large size bus is hard to be simplified as line current, transducer with circular arrangement is no longer suitable for large current measurement, especially in power system for fusion magnet coils, which has a rated current of tens of kiloampere and an impulse current up to hundreds of kiloampere when short circuit appears. Based on numerical quadrature algorithms, a magnetic sensor array based current transducer with rectangular arrangement is proposed in this paper. For the sensor array, the dimension of the rectangle depends on the magnetic field distribution, while the quantity and arrangement method is deduced by numerical quadrature theory which can improve the measurement accuracy. In addition, the effect of installation error is also discussed in this paper. A transducer prototype is developed to measure the current, which is 420 kA, through bundle busbars with a total section size of 2990 mm×650 mm. Compared with high accuracy fiber transducer, the consistency of experimental results demonstrates the high accuracy and reliability of the proposed transducer.
Key words： Current measurement, magnetic sensor array, numerical quadrature theory, large size bus
| Eligible for student paper award? | No |
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