ABB RELION REX640 Technical Manual page 1041

Protection and control

Hide thumbs Also See for RELION REX640:

Table of Contents

1MRS759142 F

Figure 579: Fault direction estimation on negative sequence impedance level

Once activated, the Timer activates the START output. The timer characteristic is

according to DT. When the operation timer has reached the value set by

delay time , the OPERATE output is activated if the operating conditions persists.

If a drop-off situation happens, that is, a fault suddenly disappears before the

operate delay is exceeded, the timer reset state is activated. If the reset timer

reaches the value set by

output is deactivated. The timer calculates the start duration value START_DUR,

which indicates the percentage ratio of the start situation and the set operation

time. 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 in 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 relay

program. The influence of the BLOCK signal activation is preselected with the global

the operation timer is frozen to the prevailing value, but the OPERATE output is not

deactivated when blocking is activated. 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.

Technical Manual

Reset delay time , the operate timer resets and the START

Blocking mode .

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

Ng Seq impedance Fw

Ng Seq impedance Rv

Protection functions