ABB RELION REX640 Technical Manual page 847

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1MRS759142 C

Technical Manual

Operation mode

Freq< + df/dt

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Protection functions

A consecutive operation is enabled between the

protection methods. When the measured

frequency is below the set value of the

Freq< setting, the frequency gradient protection is

enabled. After the frequency has dropped below

the set value, the frequency gradient is compared

Start value df/dt setting.

to the set value of the

When the frequency gradient exceeds the set

value, the module activates the START and

STR_FRG outputs. The time characteristic is

according to DT. When the operation timer has

reached the value set by the

setting, the OPERATE and OPR_FRG outputs are

activated. If the frequency gradient restores before

the module operates, the reset timer is activated. If

the timer reaches the value set by the

Tm df/dt setting, the operate timer resets and the

START and STR_FRG outputs are deactivated.

The OPR_UFRQ output is not active when this

operation mode is used.

Operate Tm df/dt

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