ABB RELION REX640 Technical Manual page 1067

Protection and control

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1MRS759142 F

Figure 595: Operating characteristics with the Start Value setting, Power angle (α)

being +45 and Directional mode "Forward"

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

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

time , the OPERATE output is activated. If a drop-off situation happens, that is, the

value of power drops below

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

time , the operate timer resets and the START output is deactivated.

The Timer calculates the start duration value START_DUR, which indicates the

percentage ratio of the start situation and the set operating time (DT). The value

is available in the Monitored data view.

Blocking logic

There are three operation modes in the blocking function. 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 operate timer is frozen to the prevailing value. In the "Block all" mode, the

whole function is blocked and the timers are reset. In the "Block OPERATE output"

mode, the function operates normally but the OPERATE output is not activated.

DOPPDPR is used to provide protection against an excessive power flow in the

set operating direction. The main application is the protection of generators and

Technical Manual

Non operating

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

Start value before the operate delay is exceeded, the

Blocking mode .

Protection functions

Operate delay