ABB RELION REX640 Technical Manual page 485

Protection and control

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1MRS759142 F

Figure 274: Example of INTRPTEF operation in "Transient EF" mode in the faulty

In the "Intermittent EF" mode the OPERATE output is activated when the following

conditions are fulfilled:

• the number of transients that have been detected exceeds the

• the timer has reached the time set with the

• and one additional transient is detected during the drop-off cycle

there is no OPERATE activation, for example, the fault disappears momentarily

START stays activated until the

if time between transients is more than

a fixed pulse length of 100 ms for OPERATE is given, whereas START is reset after

Reset delay time elapses

Technical Manual

Reset delay time starts to elapse from each detected transient (peak). In case

Operate delay time

Reset delay time elapses, that is, reset takes place

Reset delay time . After OPERATE activation,

Protection functions

Peak counter limit