This paper presents the theory,design and application of a on line ion concentration measuring system,which is provided with a double beam measuring technique.The system originally uses the dual LED in serial as a light source and SPD as a sensor,thus being able to keep the ion concentration under on line detection for a long time.The system is high accuracy with low cost and capable of working continuously.No similar design has been reported at home and abroad.
The electronic current transformer (ECT) (especially optical current transformers) contains electronic and optical devices, so it is sensitive to vibration, and the abnormal output of the ECT affected by vibration interference may cause measurement deviations. Base on the National Standard for Electronic Transformer, this paper designs the test system and method of the ECT under the vibration disturbance during the operation of the circuit breaker. The randomly selected optical current transformers were tested, it showed that, under the mechanical coupling vibration of the circuit breaker, the maximum percent of root-mean-square value of each cycle of the secondary output signal is 0.48% of the rated output and the peak value is 0.72%, which can meet the requirement of measurement accuracy. The design of the test system and method is beneficial to improve the inspection level and promote the application of ECTs.
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