ABB RELION REX640 Technical Manual page 1059

Protection and control

Hide thumbs Also See for RELION REX640:

Table of Contents

1MRS759142 F

Figure 591: Operating characteristics of DUPPDPR with setting Start value

Once activated, the Timer activates the START output. The time characteristics

are according to DT. When the operation timer has reached the value of

delay time , the OPERATE output is activated. In a drop-off situation, that is, if the

underpower condition disappears before the operation delay is exceeded, the timer

reset state is activated. If the reset timer reaches the value set by

the operation timer resets and the START output is deactivated.

The Timer calculates the START_DUR value which indicates the percentage of the

time elapsed since the activation of the START output with respect to

time . The value is available in the Monitored data.

The DISABLE input can be used to coordinate the correct operation during the

generator start-up situation. By activating the DISABLE signal, both the START and

OPERATE outputs are blocked. Once the DISABLE signal is deactivated, the Timer

remains blocked for an additional time duration as set through the setting

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

controlled by a binary input, a horizontal communication input or an internal signal

of the protection relay's program. The influence of the BLOCK signal activation is

preselected with the global setting

mode, the operation timer is frozen to the prevailing value. In the "Block all" mode,

Technical Manual

Blocking mode setting has three blocking methods. In the "Freeze timers"

Blocking mode .

Protection functions

Reset delay time ,

Operate delay