Application Guide - NP900 Series
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A996A
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 current 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.
3.3.6.4
E
VENTS AND REGISTERS
The MJP function generates events and registers from the status changes of start, trip
and blocked. To main event buffer is possible to select status “On” or “Off” messages. The
MJP function offers four independent instances which events are segregated for each
instance operation.
In the function is available 12 last registers where the triggering event of the function
(start, trip or blocked) is recorded with time stamp and process data values.
Table 3.3.6.4-182. Event codes of the MJP function
In the register of the MJP function is recorded start, trip or blocked “On” event process
data. In the table below is presented the structure of MJP function register content. This
information is available in 12 last recorded events for all provided instances separately.
Event
Number
Event
channel
Event block name
Event
Code
Description
Event
Type
3776
59 MJP1
0 Start ON
1
3777
59 MJP1
1 Start OFF
0
3778
59 MJP1
2 Trip ON
1
3779
59 MJP1
3 Trip OFF
0
3780
59 MJP1
4 Block ON
1
3781
59 MJP1
5 Block OFF
0
