ABB RELION REX640 Technical Manual page 924

Protection and control

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Protection functions

Operation mode

Freq< OR df/dt

Freq> OR df/dt

The module calculates the start duration value which indicates the percentage ratio

of the start situation and set operate time (DT). The start duration is available

according to the selected value of the

Table 882: Start duration value

Operation mode in use

The combined start duration START_DUR indicates the maximum percentage ratio

of the active protection modes. The values are available via the Monitored data view.

A parallel operation between the protection methods is en-

output is activated when either of the

measured values of the protection module exceeds its set

value. Detailed information about the active module is availa-

operate delay time from the set

ate Tm df/dt is dominant regarding the

The time characteristic is according to DT. The characteristic

that activates the

restores before the module operates, the reset timer is acti-

vated. If the timer reaches the value set by the

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

output is deactivated. If the frequency restores before the

module operates, the reset timer is activated. If the timer

reaches the value set by the

operate timer resets and the

A parallel operation between the protection methods is en-

output is activated when either of the

measured values of the protection module exceeds its set

value. A detailed information from the active module is avail-

operate delay time from the set

ate Tm df/dt is dominant regarding the

The time characteristic is according to DT. The characteristic

that activates the

restores before the module operates, the reset timer is acti-

vated. If the timer reaches the value set by the

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

output is deactivated. If the frequency restores before the

module operates, the reset timer is activated. If the timer

reaches the value set by the

operate timer resets and the

Operation mode setting.

Available start duration value

1MRS759142 F

outputs. The shortest

Operate Tm Freq or Oper-

output can be seen from the

output. If the frequency gradient

Reset delay Tm Freq setting, the

output is deactiva-