ABB RELION REX640 Technical Manual page 575

Protection and control

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1MRS759142 F

Estimated stabilized fundamental frequency residual current

set Min operate current level, which is applied in current magnitude threshold

supervision, and which is further defined with setting Operating quantity

(available options are "Adaptive", "Amplitude" and "Resistive").

In the "Transient EF" mode, the START output is activated immediately when start

conditions are met.

Figure 331: Operation in "Transient EF" mode

Blocking logic

There are three operation modes in the blocking functionality. The operation

modes are controlled by the BLOCK input and the global setting Configuration >

System > Blocking mode which selects the blocking mode. The BLOCK input can be

Technical Manual

Reset delay time

When operation mode "Transient EF" is selected,

should be set to "Resistive" and

Tilt angle should be 10 degrees especially if the residual current is

measured with Holmgreen (sum) connection of phase current CTs.

Protection functions

Operate delay time

Operating quantity

Min operate current to the minimum