ABB RELION 611 Series Technical Manual page 254

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Protection functions

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MNSPTOC Inverse Curve B

If the fault disappears, the negative-sequence current drops below the Start value

setting and the START output is deactivated. The function does not reset

instantaneously. Resetting depends on the equation or the Cooling time setting.

The timer is reset in two ways:

When the negative sequence current drops below start value the subtraction in the

denominator becomes negative and the cumulative sum starts to decrease. The

decrease in the sum indicates the cooling of the machine and the cooling speed

1MRS757454 D

Technical Manual