ABB RELION REX640 Technical Manual page 572

Protection and control

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Protection functions

The START output is activated once

not valid in the "Alarming EF" mode. Reset timer is started if any of the above three

conditions are not valid. In case the fault is transient and self-extinguishes, START

output stays activated until the elapse of reset timer (setting

Figure 329: Operation in "Alarming EF" mode

Intermittent EF

If detection of temporary earth faults is not desired, the activation of

START output can be delayed with setting

To keep the operate timer activated between current spikes during

intermittent or restriking earth fault, the

set above the maximum expected time interval between fault spikes

(obtained at full resonance condition). The recommended value is at least

Start delay time has elapsed. OPERATE output is

Start delay time .

Reset delay time should be

1MRS759142 F

Reset delay time ).

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