Step1 Press the enter and go to setting 2 Step2 Enter password 0000 Step3 Change the CT & PT primary and secondary ratio. After that press the enter and press exit button.
The purpose of fuse fail signal in abb make rel670 distance protection relay to block the all impedance based protection when this signal is high.Its means when the fuse failure signal high Zone-1,Zone-2,Zone-3,Zone -4 tripping of line are block.
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