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Set a current above the set operating value of I>>. Inject the current instantaneously and check that the alarm output relay I>> operates. Check the tripping time of the high set element according chapter 6.4.5. Check the accuracy of the operating current setting by gradually increasing the injected current until the I>> element picks up. Read the current value form the am-meter and compare with the desired setting. Repeat the entire test on other phases and earth current input circuits in the same manner. 

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