Ice NP900 Series, Инструкция по применению

Страница: 305 / 504

Application Guide - NP900 Series 305 (504
)
A996A
Table 3.4.6.2-203 Pick-up characteristics setting
Name Description Range Step Default
Uset< Pick-up setting 1.00 … 100.00 %U
N
0.01 %U
N
20 %U
N
I1<
block If measured
positive sequence
current is below
this tripping is not
allowed. 0*In
setting disables
block. 0.00…100.00 *In 0.01 *In 0 %Un
The pick-up activation of the function is not directly equal to start-signal generation of the
function. Start signal is allowed if blocking condition is not active.
3.4.6.3 F
UNCTION BLOCKING
In the blocking element the block signal is checked at the beginning of each program
cycle. Blocking signal is received from the blocking matrix for the function dedicated input.
If the blocking signal is not activated when the pick-up element activates, a START signal
is generated and the function proceeds to the time characteristics calculation.
If blocking signal is active when pick-up element activates a BLOCKED signal will be
generated and the function shall not process the situation further. If START function has
been activated before blocking signal it will reset and the release time characteristics are
processed as in case of when pick-up signal is reset.
From blocking of the function a HMI display event as well as time stamped blocking event
with information of the startup voltage values and fault type is issued.
Blocking signal can be tested also in the commissioning phase of the stage by software
switch signal when relay common and global testing mode is activated.
User settable variables are binary signals from the system. Blocking signal needs to reach
the IED minimum of 5 ms before the set operating delay has passed for blocking to be
active in time.