ABB RELION REX640, Техническое руководство, Страница: 1067 / 1960


Start value
Non operating
area
Operating
area
P
Q
Figure 595: Operating characteristics with the Start Value setting, Power angle (α)
being +45 and Directional mode "Forward"
Timer
Once activated, the Timer activates the
START
output. The time characteristics are
according to DT. When the operation timer has reached the value of
Operate delay
time, the
OPERATE
output is activated. If a drop-off situation happens, that is, the
value of power drops below
Start value before the operate delay is exceeded, the
timer reset state is activated. If the reset timer reaches the value set by
Reset delay
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 Blocking mode.
The Blocking mode setting has three blocking methods. In the "Freeze timers"
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.
4.8.2.6 Application
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
1MRS759142 F Protection functions
REX640
Technical Manual
1067