It is possible to power-cycle the IED in this state without losing the forcing
states and values. This means that once a signal is forced, and the IED
remains in IED test mode, the input or output will appear “frozen” at the
value selected by the user, even if the IED is switched off and back on
again.
Freezing a signal value without changing it
• Set the status of a signal to Forced, in the forcing menu that corresponds to the I/O
card in question. See example of LHMI menu in figure 22
IEC15000020 V1 EN
Figure 22: Example of LHMI menu using BIM3
The signal “freezes” and will not change value even if, for example, a binary input signal
voltage changes level, or if a binary output is activated as the result of a protection function
block activating.
10.8.3.2 Forcing by using PCM600
In PCM600 the concept is a bit different compared to LHMI. The forcing is accomplished
by entering a forcing session. Within such a session, multiple signals on multiple I/O
boards may be edited and changed at the same time and has no effect on the IED. Once the
user is satisfied with the forcing setup, then all the changes can be effectuated
simultaneously towards the IED, potentially changing inputs and outputs on multiple I/O
boards at the same time. It is also possible to abort this operation (described in step 6
below) and to
undo all forcing.
Section 10 1MRK 504 165-UUS -
Testing IED operation
100 Transformer protection RET670 2.2 ANSI
Commissioning manual
To Next Page
Loading...
Need help?
General
