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Line lamp transformer checking current transformer circuit

2016-08-14 12:51  
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Line lamp transformer checking current transformer circuit
10% error qualification of the current transformer has a direct impact on power system relay protection. If it is failed, it will cause current protection to refuse to move and the expansion of the accident, it must be calibrated periodically. The method to check current transformer by line lamp transformer is shown as the figure. Operation method: closing the knife-switch QS, slowly adjusting regulator TA will make line lamp transformer T's voltage gradually increase, then ammeter PA1 , PA2 reading will slowly increase.